/* ============================================================
   TinHocPro THPTQG — Design System: Energy Orange Palette
   Colors:
   - Deep Accent: #7C2D12
   - Energy Orange: #EA580C
   - Amber Yellow: #FBBF24
   - Soft Cream: #FFF1D6
   - Warm Canvas: #FFFCF7
   ============================================================ */

:root {
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --color-deep: #7C2D12;
  --color-primary: #EA580C;
  --color-primary-hover: #C2410C;
  --color-primary-light: #FFEDD5;
  --color-amber: #FBBF24;
  --color-amber-dark: #D97706;
  --color-cream: #FFF1D6;
  --color-bg: #FFFCF7;
  --color-surface: #FFFFFF;
  --color-surface-trans: rgba(255, 255, 255, 0.82);
  --color-border: #FED7AA;
  --color-border-subtle: #FFEDD5;
  --color-text-main: #271C19;
  --color-text-muted: #786C65;
  --color-text-deep: #431407;
  --color-success: #16A34A;
  --color-success-bg: #DCFCE7;
  --color-danger: #DC2626;
  --color-danger-bg: #FEE2E2;

  --font-main: 'Plus Jakarta Sans', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, 'Noto Sans', 'Liberation Sans', sans-serif;
  --font-code: 'JetBrains Mono', 'Fira Code', 'Consolas', 'Menlo', 'Courier New', monospace;

  --shadow-sm: 0 1px 3px rgba(124, 45, 18, 0.06), 0 1px 2px rgba(124, 45, 18, 0.04);
  --shadow-md: 0 4px 14px rgba(124, 45, 18, 0.08), 0 2px 6px rgba(234, 88, 12, 0.04);
  --shadow-lg: 0 10px 25px -3px rgba(124, 45, 18, 0.12), 0 4px 10px -2px rgba(234, 88, 12, 0.08);
  --shadow-glow: 0 0 25px rgba(234, 88, 12, 0.28);
  --shadow-amber-glow: 0 0 20px rgba(251, 191, 36, 0.35);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  overflow-x: hidden;
  max-width: 100vw;
  width: 100%;
}

#root, .app-container {
  overflow-x: hidden;
  max-width: 100vw;
  width: 100%;
}

body {
  font-family: var(--font-main);
  background-color: var(--color-bg);
  color: var(--color-text-main);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-image: 
    radial-gradient(circle at 10% 15%, rgba(251, 191, 36, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 90% 85%, rgba(234, 88, 12, 0.06) 0%, transparent 45%),
    linear-gradient(180deg, #FFF9F2 0%, #FFFCF7 100%);
  background-attachment: fixed;
}

/* Base button styles */
button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
  outline: none;
  transition: all var(--transition-fast);
}

button:active {
  transform: scale(0.98);
}

a {
  color: inherit;
  text-decoration: none;
}

/* App Shell Layout */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ============================================================
   TOP HORIZONTAL SIDEBAR / NAV BAR (Thanh sidebar ngang)
   ============================================================ */
.horizontal-sidebar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 252, 247, 0.95);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1.5px solid var(--color-border);
  box-shadow: 0 4px 20px rgba(124, 45, 18, 0.05);
}

/* Header Top Level: Brand & Student Info Profile */
.top-nav-row {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.brand-logo-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-primary), var(--color-deep));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: var(--shadow-glow);
  position: relative;
  overflow: hidden;
}

.brand-logo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: inherit;
  display: block;
  position: relative;
  z-index: 1;
}

.brand-logo-icon::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent 40%, rgba(255, 255, 255, 0.3) 50%, transparent 60%);
  animation: shine 4s infinite;
}

@keyframes shine {
  0% { transform: translate(-100%, -100%) rotate(45deg); }
  20%, 100% { transform: translate(100%, 100%) rotate(45deg); }
}

.brand-title {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-deep);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.brand-title span {
  color: var(--color-primary);
}

.brand-tag {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.15rem 0.55rem;
  border-radius: var(--radius-full);
  background: var(--color-cream);
  color: var(--color-deep);
  border: 1px solid var(--color-border);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* User Student Profile Widget at Top Bar */
.student-bar-widget {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.streak-pill {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, #FFF7ED, var(--color-cream));
  border: 1.5px solid var(--color-amber);
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.streak-pill:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-amber-glow);
}

.streak-flame-icon {
  color: var(--color-primary);
  animation: flamePulse 1.8s infinite ease-in-out;
}

@keyframes flamePulse {
  0%, 100% { transform: scale(1); filter: drop-shadow(0 0 2px var(--color-primary)); }
  50% { transform: scale(1.18); filter: drop-shadow(0 0 8px var(--color-amber)); }
}

.streak-number {
  font-weight: 800;
  color: var(--color-deep);
  font-size: 0.95rem;
}

.streak-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

/* Student Account Card (Display only, non-clickable) */
.student-profile-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 4px 14px 4px 5px;
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
  cursor: default;
  user-select: none;
  max-width: 240px;
  box-sizing: border-box;
}

.student-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--color-primary);
  background-color: var(--color-cream);
  display: block;
  flex-shrink: 0;
  box-shadow: 0 2px 5px rgba(124, 45, 18, 0.15);
}

.student-name {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-deep);
  line-height: 1.2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 150px;
}

.student-logout-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(220, 38, 38, 0.08);
  color: #DC2626;
  border: 1.5px solid rgba(220, 38, 38, 0.16);
  cursor: pointer;
  flex-shrink: 0;
  transition: all 0.2s ease;
}

.student-logout-btn:hover {
  background: rgba(220, 38, 38, 0.16);
  border-color: #DC2626;
  transform: scale(1.05);
}

.btn-google-login {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.55rem 1.1rem;
  background: #ffffff;
  color: #374151;
  border: 1.5px solid #E5E7EB;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.btn-google-login:hover {
  border-color: var(--color-primary);
  background: #FFF7ED;
  color: var(--color-deep);
  box-shadow: 0 4px 14px rgba(234, 88, 12, 0.15);
}

/* ============================================================
   HORIZONTAL NAVIGATION DOCK (Tabs grouped under LEARNING)
   ============================================================ */
.category-dock-wrapper {
  background: #FFF7ED;
  border-top: 1px solid var(--color-border-subtle);
  padding: 0.35rem 1.5rem;
}

.category-dock {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.category-badge {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.85rem;
  background: var(--color-deep);
  color: #FFFFFF;
  border-radius: var(--radius-sm);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  box-shadow: 0 2px 6px rgba(124, 45, 18, 0.2);
}

.category-tabs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  overflow-x: auto;
  scrollbar-width: none;
  /* Chừa vùng đệm để pill (khi nảy spring) và bóng đổ không bị overflow cắt góc
     ở tab đầu/cuối; margin âm bù lại để bố cục giữ nguyên vị trí cũ */
  padding: 6px 10px 10px;
  margin: -6px -10px -10px;
}

.category-tabs::-webkit-scrollbar {
  display: none;
}

.nav-tab-btn {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.55rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-text-muted);
  background: transparent;
  white-space: nowrap;
  transition: color var(--transition-fast), background-color var(--transition-fast);
  position: relative;
  z-index: 1;
  outline: none;
}

.nav-tab-btn:hover {
  color: var(--color-deep);
  background: rgba(254, 215, 170, 0.35);
}

.nav-tab-btn.active {
  color: #FFFFFF;
  background: transparent;
}

.nav-tab-inner {
  position: relative;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}

.nav-tab-active-pill {
  position: absolute;
  inset: 0;
  /* border-radius đặt qua style inline trong Navbar để Framer Motion hiệu chỉnh khi co giãn */
  background: linear-gradient(135deg, var(--color-primary), var(--color-deep));
  box-shadow: 0 4px 14px rgba(234, 88, 12, 0.28);
  z-index: 1;
  pointer-events: none;
}

.nav-tab-btn .tab-badge-hot {
  font-size: 0.62rem;
  font-weight: 800;
  padding: 0.1rem 0.35rem;
  border-radius: var(--radius-full);
  background: var(--color-amber);
  color: var(--color-deep);
  line-height: 1;
}

.brand-slogan {
  font-size: 0.72rem;
  color: var(--color-text-muted);
  font-weight: 500;
  transition: opacity var(--transition-fast);
}

.tab-label-short {
  display: none;
}

.tab-label-full {
  display: inline;
}

.knowledge-matrix-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.selection-grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.exam-scale-btn-group {
  display: flex;
  gap: 0.65rem;
}

/* Main Content Area */
.main-content {
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem 1.5rem;
  flex: 1;
}

/* ============================================================
   PAGE 1: TRANG CHỦ (Home Dashboard & Streak System)
   ============================================================ */
.home-grid {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 1.75rem;
}

@media (max-width: 1024px) {
  .home-grid {
    grid-template-columns: 1fr;
  }
}

/* Hero Welcome Banner */
.hero-welcome-card {
  background: linear-gradient(115deg, #C93B03 0%, #D84315 30%, #EA580C 65%, #F05A00 100%);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  color: #FFFFFF;
  position: relative;
  overflow: visible;
  box-shadow: 0 10px 25px -3px rgba(201, 59, 3, 0.28), 0 4px 10px -2px rgba(234, 88, 12, 0.15);
}

/* Lớp gradient cam trôi chậm chu kỳ 12s */
.hero-gradient-layer {
  position: absolute;
  top: 0;
  bottom: 0;
  left: -30%;
  width: 160%;
  background: linear-gradient(115deg, #C93B03 0%, #D84315 28%, #EA580C 60%, #F05A00 85%, #C93B03 100%);
  animation: heroGradientShift 12s ease-in-out infinite;
  will-change: transform;
}

/* Trôi bằng transform (chạy trên compositor) thay vì background-position (repaint mỗi khung hình) */
@keyframes heroGradientShift {
  0%, 100% { transform: translate3d(0, 0, 0); }
  50% { transform: translate3d(18%, 0, 0); }
}

.hero-animated-bg.is-paused .hero-gradient-layer,
.hero-animated-bg.is-paused .hero-ambient-orb,
.hero-animated-bg.is-paused .hero-glyph,
.hero-animated-bg.is-paused .hero-lens-sweep {
  animation-play-state: paused !important;
}

/* ---- Chiều sâu banner: 3 tầng (xa: đốm sáng / giữa: ký tự code / gần: kính của Mew) ---- */
.hero-depth-layer {
  position: absolute;
  inset: 0;
}

/* Ký tự code lơ lửng, nằm nửa phải để không đè lên tiêu đề */
.hero-glyph {
  position: absolute;
  color: rgba(255, 241, 214, 0.34);
  font-family: var(--font-code);
  font-weight: 700;
  line-height: 1;
  white-space: nowrap;
  user-select: none;
  animation: glyphFloat var(--dur, 10s) ease-in-out var(--delay, 0s) infinite;
}

@keyframes glyphFloat {
  0%, 100% { transform: translate3d(0, 0, 0) rotate(-2deg); opacity: 0.55; }
  50% { transform: translate3d(0, -10px, 0) rotate(2deg); opacity: 1; }
}

/* Cặp kính: neo góc phải trên, trang trí thuần túy */
.hero-lens-slot {
  position: absolute;
  top: 18px;
  right: 22px;
  width: 188px;
  height: 84px;
}

.hero-lens {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  opacity: 0.9;
}

.hero-lens-rim {
  position: relative;
  width: 78px;
  height: 66px;
  border-radius: 46% 46% 52% 52%;
  border: 4px solid rgba(255, 241, 214, 0.78);
  background: rgba(255, 237, 213, 0.1);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-lens-bridge {
  width: 18px;
  height: 4px;
  margin: 0 -1px;
  border-radius: 999px;
  background: rgba(255, 241, 214, 0.78);
  transform: translateY(-8px);
}

.hero-lens-glyph {
  font-family: var(--font-code);
  font-weight: 800;
  font-size: 17px;
  color: rgba(255, 247, 237, 0.92);
}

/* Vệt sáng quét qua tròng kính, lặp 6s */
.hero-lens-sweep {
  position: absolute;
  top: -10%;
  left: 0;
  width: 38%;
  height: 120%;
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, 0.5), transparent);
  transform: translateX(-160%) skewX(-18deg);
  animation: lensSweep 6s var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1)) infinite;
}

.hero-lens-sweep--late {
  animation-delay: 0.25s;
}

@keyframes lensSweep {
  0%, 62% { transform: translateX(-160%) skewX(-18deg); }
  86%, 100% { transform: translateX(340%) skewX(-18deg); }
}

/* Banner hẹp: bỏ kính và bớt ký tự để không chen vào chữ */
@media (max-width: 900px) {
  .hero-lens-slot { display: none; }
  .hero-glyph:nth-child(n+4) { display: none; }
}

.hero-welcome-cat {
  position: absolute;
  top: -14px;
  left: -20px;
  width: 50px;
  height: auto;
  z-index: 10;
  pointer-events: none;
  user-select: none;
  filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.2));
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.hero-welcome-card:hover .hero-welcome-cat {
  transform: scale(1.08) rotate(-3deg);
}

.hero-welcome-card::before {
  content: '';
  position: absolute;
  right: 0;
  top: 0;
  width: 280px;
  height: 100%;
  max-height: 260px;
  background: radial-gradient(circle at 88% 28%, rgba(255, 175, 45, 0.45) 0%, transparent 65%);
  pointer-events: none;
  border-top-right-radius: inherit;
  border-bottom-right-radius: inherit;
}

.hero-welcome-card::after {
  display: none;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(255, 241, 214, 0.2);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(251, 191, 36, 0.4);
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--color-amber);
  margin-bottom: 1rem;
}

.hero-title {
  font-size: 1.85rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 0.65rem;
}

.hero-desc {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.88);
  max-width: 600px;
  margin-bottom: 1.5rem;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.btn-primary-glow {
  position: relative;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--color-amber);
  color: var(--color-deep);
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  font-weight: 700;
  box-shadow: 0 4px 15px rgba(251, 191, 36, 0.4);
  transition: transform 0.2s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.2s cubic-bezier(0.22, 1, 0.36, 1), background 0.15s ease;
  cursor: pointer;
  border: none;
}

/* Hiệu ứng ánh sáng quét ngang (shine) MỖI 5s một lần, rất mờ */
.btn-primary-glow::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 55%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.24) 50%,
    transparent 100%
  );
  transform: translateX(-150%) skewX(-25deg);
  animation: btnShineSweep 5s ease-in-out infinite;
  pointer-events: none;
}

/* Quét bằng transform thay vì animate `left` (tránh layout mỗi khung hình) */
@keyframes btnShineSweep {
  0%, 72% {
    transform: translateX(-150%) skewX(-25deg);
  }
  86%, 100% {
    transform: translateX(260%) skewX(-25deg);
  }
}

.btn-primary-glow svg {
  transition: transform 0.2s cubic-bezier(0.22, 1, 0.36, 1);
}

.btn-primary-glow:hover {
  background: #F59E0B;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(251, 191, 36, 0.55);
}

/* Hover: mũi tên "→" trượt sang phải 4px */
.btn-primary-glow:hover svg {
  transform: translateX(4px);
}

.btn-primary-glow:active {
  transform: scale(0.97);
}

.btn-outline-white {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: rgba(255, 255, 255, 0.12);
  color: #FFFFFF;
  border: 1.5px solid rgba(255, 255, 255, 0.3);
  padding: 0.72rem 1.35rem;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  font-weight: 600;
  backdrop-filter: blur(4px);
  transition: transform 0.2s cubic-bezier(0.22, 1, 0.36, 1), background 0.15s ease, border-color 0.15s ease;
  cursor: pointer;
}

.btn-outline-white:hover {
  background: rgba(255, 255, 255, 0.22);
  border-color: #FFFFFF;
  transform: translateY(-2px);
}

.btn-outline-white:active {
  transform: scale(0.97);
}

/* Quick Metrics Row */
.metrics-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 1.5rem;
}

@media (max-width: 768px) {
  .metrics-row {
    grid-template-columns: repeat(2, 1fr);
  }
}

.metric-card {
  background: var(--color-surface);
  border: 1.5px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem 1rem;
  box-shadow: var(--shadow-sm);
  /* Nâng thẻ do framer-motion (variant hover) điều khiển; CSS chỉ lo màu viền */
  transition: border-color 200ms ease;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  position: relative;
}

/* Lớp bóng đổ cam đặt sẵn, chỉ đổi opacity khi hover (rẻ hơn animate box-shadow) */
.metric-card::after,
.matrix-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow: 0 10px 24px -4px rgba(234, 88, 12, 0.18), 0 4px 8px -2px rgba(0, 0, 0, 0.04);
  opacity: 0;
  transition: opacity 220ms cubic-bezier(0.23, 1, 0.32, 1);
  pointer-events: none;
}

.matrix-card {
  position: relative;
  transition: border-color 200ms ease;
}

@media (hover: hover) and (pointer: fine) {
  .metric-card:hover,
  .matrix-card:hover {
    border-color: rgba(234, 88, 12, 0.4) !important;
  }

  .metric-card:hover::after,
  .matrix-card:hover::after {
    opacity: 1;
  }

  .metric-card:hover .metric-icon-wrap {
    transform: scale(1.08) rotate(4deg);
  }
}

.metric-icon-wrap {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.3rem;
  transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: transform;
}

.metric-val {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-deep);
}

.metric-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

/* ============================================================
   STREAK CARD (Sidebar / Feature Panel)
   ============================================================ */
.streak-card {
  background: linear-gradient(180deg, #FFFFFF 0%, #FFF9F2 100%);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  position: relative;
  overflow: hidden;
}

.streak-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--color-amber), var(--color-primary));
}

.streak-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.streak-card-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--color-deep);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.streak-display-center {
  background: linear-gradient(135deg, #FFF7ED, var(--color-cream));
  border: 2px dashed var(--color-amber);
  border-radius: var(--radius-md);
  padding: 1.5rem 1rem;
  text-align: center;
  position: relative;
}

.streak-flame-giant {
  font-size: 3.25rem;
  display: inline-block;
  animation: flameBounce 1.5s infinite alternate ease-in-out;
  filter: drop-shadow(0 4px 12px rgba(234, 88, 12, 0.3));
}

@keyframes flameBounce {
  0% { transform: translateY(0) scale(0.96); }
  100% { transform: translateY(-6px) scale(1.08); }
}

.streak-big-number {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--color-deep);
  line-height: 1;
  margin-top: 0.25rem;
}

.streak-big-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 0.2rem;
}

.streak-days-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.35rem;
  margin: 0.25rem 0;
}

.day-bubble {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  flex: 1;
}

.day-bubble-circle {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  background: #F3F4F6;
  color: #9CA3AF;
  border: 1.5px solid #E5E7EB;
  transition: background-color 180ms ease, border-color 180ms ease, color 180ms ease;
}

.day-bubble.checked .day-bubble-circle {
  background: var(--color-primary);
  color: #FFFFFF;
  border-color: var(--color-deep);
  box-shadow: 0 2px 8px rgba(234, 88, 12, 0.35);
}

.day-bubble.today .day-bubble-circle {
  border: 2px solid var(--color-amber);
  animation: todayPulseRing 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* Vòng sáng nhấp nhịp nhẹ (pulse 2s) cho ngày hiện tại */
@keyframes todayPulseRing {
  0% {
    box-shadow: 0 0 0 0 rgba(234, 88, 12, 0.45);
  }
  65% {
    box-shadow: 0 0 0 7px rgba(234, 88, 12, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(234, 88, 12, 0);
  }
}

.day-name {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

/* Check-in CTA Button */
.btn-checkin-streak {
  width: 100%;
  padding: 0.9rem;
  background: linear-gradient(135deg, var(--color-primary), var(--color-deep));
  color: #FFFFFF;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  box-shadow: 0 4px 16px rgba(234, 88, 12, 0.3);
  transition: transform 160ms cubic-bezier(0.23, 1, 0.32, 1), box-shadow 160ms cubic-bezier(0.23, 1, 0.32, 1);
}

.btn-checkin-streak:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(234, 88, 12, 0.45);
}

.btn-checkin-streak:disabled {
  background: #E5E7EB;
  color: #9CA3AF;
  cursor: not-allowed;
  box-shadow: none;
}

/* Streak simulation tester */
.streak-sim-box {
  background: var(--color-cream);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  font-size: 0.78rem;
  color: var(--color-deep);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.streak-sim-row {
  display: flex;
  gap: 0.4rem;
}

.btn-sim {
  flex: 1;
  padding: 0.4rem;
  border-radius: var(--radius-sm);
  font-size: 0.72rem;
  font-weight: 700;
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  color: var(--color-deep);
  cursor: pointer;
}

.btn-sim:hover {
  background: var(--color-primary);
  color: #FFFFFF;
  border-color: var(--color-primary);
}

/* ============================================================
   STREAK EVOLUTION (hình dạng hiện tại) + BỘ SƯU TẬP
   ============================================================ */

/* Sân khấu hiển thị hình dạng đang sở hữu */
.streak-evo-stage {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  padding: 0.35rem 0 0.5rem;
}

.streak-evo-stage::before {
  content: '';
  position: absolute;
  inset: -1.25rem -1rem 0.35rem -1rem;
  background: var(--evo-aura, radial-gradient(circle at 50% 45%, #FFE8CC 0%, #FFF7ED 75%));
  border-radius: 50% 50% 45% 45%;
  opacity: 0.9;
  pointer-events: none;
  transition: background var(--transition-fast);
}

.streak-evo-glyph {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  filter: drop-shadow(0 8px 18px var(--evo-glow, rgba(234, 88, 12, 0.35)));
  animation: evoFloat 3s infinite alternate ease-in-out;
  will-change: transform;
}

@keyframes evoFloat {
  0% { transform: translateY(0) scale(0.97) rotate(-1.5deg); }
  100% { transform: translateY(-8px) scale(1.07) rotate(1.5deg); }
}

.streak-evo-stage.is-max .streak-evo-glyph {
  animation: evoFloat 2.2s infinite alternate ease-in-out, evoGlowPulse 2.2s infinite alternate ease-in-out;
}

@keyframes evoGlowPulse {
  0% { filter: drop-shadow(0 6px 14px var(--evo-glow, rgba(249, 115, 22, 0.5))) brightness(1); }
  100% { filter: drop-shadow(0 10px 30px var(--evo-glow, rgba(249, 115, 22, 0.6))) brightness(1.14); }
}

/* Tên cấp hiện tại.
   KHÔNG dùng text-transform: uppercase nữa — chuỗi dữ liệu đã ở dạng
   "Tia lửa đầu tiên" nên không cần, mà uppercase + letter-spacing rộng
   trong cột hẹp làm dấu tiếng Việt tầng tầng bị cắt -> chữ méo. */
.streak-evo-name {
  position: relative;
  z-index: 1;
  font-size: 0.82rem;
  font-weight: 900;
  letter-spacing: 0;
  line-height: 1.25;
  max-width: 100%;
  color: var(--evo-accent, var(--color-deep));
  margin-top: 0.45rem;
}

.streak-evo-next {
  position: relative;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

/* Thanh tiến độ tới cấp kế tiếp */
.streak-evo-progress {
  position: relative;
  width: 100%;
  max-width: 240px;
  height: 8px;
  margin: 0.55rem auto 0;
  border-radius: 999px;
  background: rgba(124, 45, 18, 0.12);
  overflow: hidden;
}

.streak-evo-progress-fill {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--evo-accent, var(--color-primary)), var(--evo-secondary, var(--color-amber)));
  box-shadow: 0 0 10px var(--evo-glow, rgba(234, 88, 12, 0.4));
  width: 100%;
}

/* Nhãn ân hạn (3 ngày) */
.streak-grace-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.7rem;
  font-weight: 800;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  border: 1px solid transparent;
}

/* ---- Bộ sưu tập ---- */
.streak-collection {
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  background: #FFFDFB;
  padding: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.streak-collection-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.streak-collection-title {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  font-weight: 900;
  color: var(--color-deep);
}

.streak-collection-count {
  font-size: 0.68rem;
  font-weight: 800;
  background: var(--color-cream);
  color: var(--color-deep);
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  white-space: nowrap;
}

.streak-collection-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.55rem;
}

.evo-tile {
  position: relative;
  border-radius: 14px;
  padding: 0.85rem 0.5rem 0.7rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  text-align: center;
  border: 2px solid var(--evo-card-border, var(--color-border));
  background: var(--evo-card-bg, #FFF7ED);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.evo-tile.unlocked {
  box-shadow: var(--shadow-sm);
}

.evo-tile:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 18px var(--evo-glow, rgba(234, 88, 12, 0.35));
}

/* Cấp CHƯA MỞ KHOÁ: nền trắng trơn để cái BÓNG ĐEN nổi rõ.
   Bóng do chính ảnh đổ đen bằng brightness(0) — không phải khối đen. */
.evo-tile.locked {
  border-color: #D4D4DB;
  background: #FFFFFF;
  box-shadow: none;
}

.evo-tile.locked:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 14px rgba(24, 24, 27, 0.14);
}

/* Khung chứa hình vẽ — cố định chiều cao để 6 ô luôn thẳng hàng */
.evo-tile-art {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 86px;
  margin: 0.15rem 0;
}

.evo-tile.unlocked .evo-tile-art img {
  filter: drop-shadow(0 4px 10px var(--evo-glow, rgba(234, 88, 12, 0.3)));
}

/* Bóng đen đã là khối đặc nên không cần đổ bóng thêm */
.evo-tile.locked .evo-tile-art img {
  filter: brightness(0);
}

/* Không để flex bóp méo icon/hình vẽ trong ô hẹp */
.evo-tile-art img,
.evo-tile-days svg {
  flex-shrink: 0;
}

/* Tên cấp trong ô bộ sưu tập.
   KHÔNG dùng text-transform: uppercase — chuỗi dữ liệu đã ở dạng
   "Tia lửa đầu tiên", mà uppercase + ô hẹp làm dấu tiếng Việt bị cắt. */
.evo-tile-name {
  font-size: 0.7rem;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--evo-title, var(--color-deep));
}

/* Dòng mốc ngày: 30 ngày (1 tháng) */
.evo-tile-days {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.28rem;
  font-size: 0.6rem;
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text-muted);
}

.evo-tile.locked .evo-tile-days {
  color: #90909A;
}

.evo-tile-now {
  position: absolute;
  top: -7px;
  right: -5px;
  font-size: 0.55rem;
  font-weight: 900;
  letter-spacing: 0.04em;
  color: #FFFFFF;
  background: var(--evo-accent, var(--color-primary));
  padding: 0.1rem 0.4rem;
  border-radius: 999px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  white-space: nowrap;
}

.evo-tile-lock {
  position: absolute;
  top: -4px;
  right: -2px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3px;
  border-radius: 999px;
  background: #52525B;
  color: #FFFFFF;
  box-shadow: 0 2px 6px rgba(24, 24, 27, 0.25);
}

.streak-collection-note {
  font-size: 0.66rem;
  color: var(--color-text-muted);
  line-height: 1.35;
  display: flex;
  gap: 0.35rem;
}

@media (max-width: 480px) {
  .streak-collection-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* Daily Quests & Topics Overview */
.section-title-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 2rem;
  margin-bottom: 1.15rem;
}

.section-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-deep);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.daily-quests-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.quest-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background: var(--color-surface);
  border: 1.5px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.quest-item:hover {
  border-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.quest-left {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.quest-check-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #F3F4F6;
  color: #9CA3AF;
}

.quest-item.completed .quest-check-icon {
  background: var(--color-success-bg);
  color: var(--color-success);
}

.quest-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-deep);
}

.quest-sub {
  font-size: 0.76rem;
  color: var(--color-text-muted);
}

.quest-reward {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-cream);
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-full);
}

/* ============================================================
   PAGE 2: LỘ TRÌNH HỌC TRỰC QUAN (Roadmap Tab)
   ============================================================ */
.roadmap-container {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.roadmap-header-card {
  background: linear-gradient(135deg, #FFF7ED, var(--color-cream));
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  box-shadow: var(--shadow-sm);
}

.roadmap-header-text h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-deep);
  margin-bottom: 0.4rem;
}

.roadmap-header-text p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  max-width: 650px;
}

.roadmap-stats-badges {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.stat-chip {
  background: #FFFFFF;
  border: 1.5px solid var(--color-border);
  padding: 0.6rem 1rem;
  border-radius: var(--radius-md);
  text-align: center;
  min-width: 100px;
  box-shadow: var(--shadow-sm);
}

.stat-chip-num {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-primary);
}

.stat-chip-lbl {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

/* Visual Chained Roadmap Track */
.chain-track {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0;
  max-width: 900px;
  margin: 1rem auto;
  width: 100%;
}

.chain-station-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

/* Chain Segment SVG Link */
.chain-link-connector {
  width: 48px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  margin: -4px 0;
  z-index: 1;
}

.chain-link-connector svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 2px 4px rgba(124, 45, 18, 0.15));
}

.chain-link-connector.unlocked svg path {
  stroke: var(--color-primary);
  stroke-width: 4;
  stroke-dasharray: 8 4;
  animation: chainGlow 2s infinite linear;
}

.chain-link-connector.locked svg path {
  stroke: #D1D5DB;
  stroke-width: 3.5;
}

@keyframes chainGlow {
  0% { stroke-dashoffset: 24; filter: drop-shadow(0 0 3px var(--color-amber)); }
  50% { filter: drop-shadow(0 0 8px var(--color-primary)); }
  100% { stroke-dashoffset: 0; filter: drop-shadow(0 0 3px var(--color-amber)); }
}

/* Station Node Card */
.station-node-card {
  width: 100%;
  background: #FFFFFF;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.75rem;
  box-shadow: var(--shadow-md);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  z-index: 2;
}

.station-node-card:hover {
  transform: translateY(-3px) scale(1.01);
  box-shadow: var(--shadow-lg);
}

.station-node-card.completed {
  border-color: #86EFAC;
  background: linear-gradient(135deg, #FFFFFF 0%, #F0FDF4 100%);
}

.station-node-card.in-progress {
  border-color: var(--color-primary);
  background: linear-gradient(135deg, #FFFFFF 0%, #FFF7ED 100%);
  box-shadow: var(--shadow-glow);
  outline: 2px solid rgba(234, 88, 12, 0.2);
}

.station-node-card.locked {
  background: #F9FAFB;
  border-color: #E5E7EB;
  opacity: 0.78;
  cursor: not-allowed;
}

.node-left-col {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.node-badge-icon {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 800;
  position: relative;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.station-node-card.completed .node-badge-icon {
  background: linear-gradient(135deg, #22C55E, #15803D);
  color: #FFFFFF;
  box-shadow: 0 4px 12px rgba(34, 197, 94, 0.3);
}

.station-node-card.in-progress .node-badge-icon {
  background: linear-gradient(135deg, var(--color-primary), var(--color-deep));
  color: #FFFFFF;
  box-shadow: var(--shadow-glow);
  animation: pulseNode 2s infinite;
}

@keyframes pulseNode {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.06); }
}

.station-node-card.locked .node-badge-icon {
  background: #E5E7EB;
  color: #9CA3AF;
}

.node-text-col h3 {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--color-deep);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.25rem;
}

.node-desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  max-width: 500px;
  margin-bottom: 0.5rem;
}

.node-tags-row {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.node-tag {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  background: var(--color-cream);
  color: var(--color-deep);
  border: 1px solid var(--color-border);
}

.node-right-col {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.5rem;
  flex-shrink: 0;
}

.progress-bar-shell {
  width: 140px;
  height: 8px;
  background: #E5E7EB;
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-amber), var(--color-primary));
  border-radius: var(--radius-full);
  width: 100%;
  /* Vẽ phần đã đạt bằng clip-path: không đổi layout, giữ đầu bo tròn */
  transition: clip-path 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

.btn-open-station {
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-md);
  font-size: 0.82rem;
  font-weight: 700;
  background: var(--color-cream);
  color: var(--color-deep);
  border: 1.5px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-open-station:hover {
  background: var(--color-primary);
  color: #FFFFFF;
  border-color: var(--color-primary);
}

/* --- Phân ban Switcher & Lộ trình nâng cao --- */
.roadmap-track-switcher {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  background: #FFFFFF;
  padding: 0.75rem;
  border-radius: var(--radius-lg);
  border: 2px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

@media (max-width: 768px) {
  .roadmap-track-switcher {
    grid-template-columns: 1fr;
  }
}

.track-switch-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.15rem 1.4rem;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  background: #F8FAFC;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  text-align: left;
  position: relative;
  overflow: hidden;
}

.track-switch-btn:hover {
  background: #F1F5F9;
  transform: translateY(-2px);
}

.track-switch-btn.active-cs {
  background: linear-gradient(135deg, #FFF7ED 0%, #FFEDD5 100%);
  border-color: var(--color-primary);
  box-shadow: 0 4px 14px rgba(234, 88, 12, 0.2);
}

.track-switch-btn.active-ict {
  background: linear-gradient(135deg, #F0F9FF 0%, #E0F2FE 100%);
  border-color: #0284C7;
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.2);
}

.track-btn-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.track-icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.2s;
}

.track-switch-btn.active-cs .track-icon-wrapper {
  background: var(--color-primary);
  color: #FFFFFF;
  box-shadow: 0 4px 10px rgba(234, 88, 12, 0.35);
}

.track-switch-btn.active-ict .track-icon-wrapper {
  background: #0284C7;
  color: #FFFFFF;
  box-shadow: 0 4px 10px rgba(2, 132, 199, 0.35);
}

.track-switch-btn:not(.active-cs):not(.active-ict) .track-icon-wrapper {
  background: #E2E8F0;
  color: #64748B;
}

.track-btn-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--color-deep);
  margin-bottom: 0.2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.track-btn-subtitle {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  font-weight: 600;
}

.track-active-badge {
  font-size: 0.72rem;
  font-weight: 800;
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.track-switch-btn.active-cs .track-active-badge {
  background: var(--color-primary);
  color: #FFFFFF;
}

.track-switch-btn.active-ict .track-active-badge {
  background: #0284C7;
  color: #FFFFFF;
}

/* Exam Blueprint & 12 Weeks Plan Card */
.blueprint-card {
  background: #FFFFFF;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s;
}

.blueprint-header-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

.badge-priority-extreme {
  background: #FEE2E2;
  color: #DC2626;
  border: 1px solid #FCA5A5;
  font-size: 0.72rem;
  font-weight: 800;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  text-transform: uppercase;
}

.badge-priority-high {
  background: #FFEDD5;
  color: #EA580C;
  border: 1px solid #FDBA74;
  font-size: 0.72rem;
  font-weight: 800;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  text-transform: uppercase;
}

.badge-priority-normal {
  background: #E0F2FE;
  color: #0369A1;
  border: 1px solid #BAE6FD;
  font-size: 0.72rem;
  font-weight: 800;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.badge-priority-low {
  background: #F1F5F9;
  color: #64748B;
  border: 1px solid #CBD5E1;
  font-size: 0.72rem;
  font-weight: 800;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.badge-exam-format {
  background: #F8FAFC;
  color: var(--color-deep);
  border: 1px solid var(--color-border);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

/* Theory Viewer Modal styles */
.theory-modal-container {
  display: flex;
  flex-direction: row;
  width: 100%;
  height: 100%;
  max-height: 100%;
  flex: 1;
  overflow: hidden;
  background: #FFFFFF;
  border-radius: var(--radius-lg);
}

@media (max-width: 900px) {
  .theory-modal-container {
    flex-direction: column;
    height: 100%;
    max-height: 100%;
  }
}

.theory-modal-sidebar {
  width: 290px;
  min-width: 290px;
  max-width: 290px;
  height: 100%;
  max-height: 100%;
  background: #F8FAFC;
  border-right: 1.5px solid var(--color-border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: all 0.2s ease;
}

.theory-modal-sidebar.collapsed {
  display: none !important;
  width: 0 !important;
  min-width: 0 !important;
}

.theory-sidebar-header {
  padding: 1.25rem 1rem;
  border-bottom: 1px solid var(--color-border);
}

.theory-lessons-nav {
  flex: 1;
  overflow-y: auto;
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.theory-lesson-nav-btn {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  padding: 0.75rem 0.85rem;
  border-radius: var(--radius-md);
  border: 1.5px solid transparent;
  background: #FFFFFF;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s;
}

.theory-lesson-nav-btn:hover {
  border-color: var(--color-border);
  background: #F1F5F9;
}

.theory-lesson-nav-btn.active {
  background: #FFF7ED;
  border-color: var(--color-primary);
  box-shadow: 0 2px 8px rgba(234, 88, 12, 0.12);
}

.theory-lesson-nav-btn.active.ict-active {
  background: #F0F9FF;
  border-color: #0284C7;
  box-shadow: 0 2px 8px rgba(2, 132, 199, 0.12);
}

.theory-modal-main {
  flex: 1;
  height: 100%;
  max-height: 100%;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: #FFFFFF;
}

/* Chỉ vùng nội dung bên trong modal được phép cuộn. */
.exam-taker-window,
.theory-modal-container,
.theory-modal-main {
  overscroll-behavior: contain;
}

.exam-taker-window {
  min-height: 0;
}

.theory-main-content {
  min-height: 0;
  overscroll-behavior: contain;
  scrollbar-gutter: stable;
}

.theory-main-content {
  flex: 1;
  overflow-y: auto;
  padding: 2rem 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* Study Focus Mode (Phóng to & Tối ưu ghi chép) */
.exam-taker-window.study-focus-mode {
  width: 96vw !important;
  max-width: 1400px !important;
  height: 94vh !important;
  max-height: 94vh !important;
  border-radius: var(--radius-lg);
  box-shadow: 0 25px 60px -15px rgba(0, 0, 0, 0.35);
  border: 1.5px solid rgba(226, 232, 240, 0.8);
}

.exam-taker-window.study-focus-mode .theory-modal-container,
.exam-taker-window.full-screen-mode .theory-modal-container {
  height: 100% !important;
  max-height: 100% !important;
  flex: 1;
}

.exam-taker-window.full-screen-mode {
  width: 100vw !important;
  max-width: 100vw !important;
  height: 100vh !important;
  max-height: 100vh !important;
  border-radius: 0 !important;
  border: none !important;
}

.theory-reading-container {
  max-width: 960px;
  margin: 0 auto;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 2.25rem;
}

/* Theory Section Box (Từng đề mục lý thuyết trình bày thoáng, chuẩn học & ghi chép) */
.theory-section-box {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.75rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.theory-section-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--color-deep);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: 1.5px dashed var(--color-border);
  padding-bottom: 0.5rem;
  word-break: break-word;
  white-space: pre-wrap;
}

/* Lý thuyết: giữ nguyên ký tự đặc biệt ($ * # _ ...) Admin gõ ra sao hiển thị y vậy */
.theory-section-text {
  font-family: var(--font-main);
  font-size: var(--theory-font-size, 1.02rem);
  color: #334155;
  line-height: 1.75;
  margin-bottom: 0.85rem;
  white-space: pre-wrap;        /* GIỮ nguyên xuống dòng do Admin nhấn Enter */
  word-break: break-word;       /* Không bị vỡ layout vì chuỗi dài không có khoảng trắng */
  overflow-wrap: anywhere;      /* Tránh tràn ngang khi có ký tự đặc biệt dài */
  unicode-bidi: plaintext;      /* Hiển thị đúng thứ tự ký tự $ * # ngay cả khi trộn RTL */
}

.theory-bullet-list {
  margin: 0;
  padding-left: 1.35rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.theory-bullet-item {
  font-family: var(--font-main);
  font-size: var(--theory-font-size, 0.98rem);
  color: #1E293B;
  line-height: 1.7;
  white-space: pre-wrap;        /* Giữ xuống dòng nếu Admin nhập nhiều dòng trong 1 bullet */
  word-break: break-word;
  overflow-wrap: anywhere;
}

/* Summary + exam tips + heading: cũng phải giữ xuống dòng và ký tự đặc biệt */
.theory-summary-text,
.theory-exam-tips-text,
.theory-objective-item {
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: anywhere;
}

/* Lesson Preview Call To Action Screen */
.lesson-preview-card {
  max-width: 780px;
  margin: 2rem auto;
  padding: 2.5rem 2rem;
  text-align: center;
  background: linear-gradient(180deg, #FFFFFF, #F8FAFC);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.08);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.btn-start-learning {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 1.1rem 2.5rem;
  font-size: 1.1rem;
  font-weight: 900;
  border-radius: 999px;
  color: #FFFFFF;
  border: none;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 10px 25px -5px rgba(234, 88, 12, 0.4);
}

.btn-start-learning:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 15px 35px -5px rgba(234, 88, 12, 0.5);
}

.btn-start-learning.ict {
  box-shadow: 0 10px 25px -5px rgba(2, 132, 199, 0.4);
}

.btn-start-learning.ict:hover {
  box-shadow: 0 15px 35px -5px rgba(2, 132, 199, 0.5);
}

/* Toolbar Controls */
.theory-toolbar-btn {
  background: #F1F5F9;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 0.82rem;
  font-weight: 700;
  color: #475569;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all 0.15s ease;
}

.theory-toolbar-btn:hover {
  background: #E2E8F0;
  color: var(--color-deep);
}

.theory-toolbar-btn.active {
  background: var(--color-deep);
  color: #FFFFFF;
  border-color: var(--color-deep);
}

/* Syntax & Code Box */
.code-editor-box {
  background: #0F172A;
  border-radius: var(--radius-md);
  border: 1.5px solid #1E293B;
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.code-editor-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1rem;
  background: #1E293B;
  border-bottom: 1px solid #334155;
}

.code-editor-dots {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.code-editor-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.code-editor-pre {
  margin: 0;
  padding: 1.25rem 1.4rem;
  color: #F8FAFC;
  font-family: 'Fira Code', 'Courier New', Courier, monospace;
  font-size: 0.88rem;
  line-height: 1.6;
  overflow-x: auto;
}

/* Exam tips alert */
.exam-trap-box {
  background: linear-gradient(135deg, #FFFBEB 0%, #FEF3C7 100%);
  border: 1.5px solid #FCD34D;
  border-radius: var(--radius-md);
  padding: 1.15rem 1.4rem;
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  box-shadow: 0 2px 8px rgba(245, 158, 11, 0.1);
}

/* Admin config note */
.admin-config-hint {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.72rem;
  background: #F1F5F9;
  border: 1px solid #CBD5E1;
  color: #475569;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  font-family: monospace;
}


/* ============================================================
   PAGE 3: KHO ĐỀ THI / TÀI LIỆU (Exam Repository)
   ============================================================ */
.exam-repo-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Status Bar */
.doc-status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1.25rem;
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  flex-wrap: wrap;
}

.doc-status-bar[data-source="mock"] {
  border-color: #FCA5A5;
  background: #FFF1F2;
}

.doc-status-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-deep);
}

.doc-status-title {
  font-weight: 700;
  font-size: 0.88rem;
  color: var(--color-deep);
}

.doc-status-error {
  font-size: 0.76rem;
  color: #DC2626;
  margin-top: 0.2rem;
}

.doc-status-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.doc-btn-secondary,
.doc-btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-md);
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
}

.doc-btn-secondary {
  background: #F3F4F6;
  color: #374151;
  border: 1px solid #D1D5DB;
}

.doc-btn-secondary:hover {
  background: #E5E7EB;
  color: #111827;
}

.doc-btn-primary {
  background: var(--color-primary);
  color: #FFFFFF;
  box-shadow: 0 2px 6px rgba(234, 88, 12, 0.2);
}

.doc-btn-primary:hover:not(:disabled) {
  background: var(--color-deep);
}

.doc-btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Header & Search */
.doc-header-section {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.doc-page-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-deep);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.25rem;
}

.doc-page-subtitle {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.doc-count-badge {
  display: inline-flex;
  align-items: center;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.15rem 0.6rem;
  border-radius: var(--radius-full);
  background: var(--color-cream);
  color: var(--color-primary);
  border: 1px solid var(--color-border);
}

.doc-header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.doc-btn-refresh {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text-muted);
  border: 1.5px solid var(--color-border);
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.doc-btn-refresh:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-cream);
  box-shadow: var(--shadow-sm);
}

.doc-btn-refresh:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.doc-error-banner {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.75rem 1.15rem;
  border-radius: var(--radius-md);
  background: #FEF2F2;
  color: #DC2626;
  border: 1px solid #FECACA;
  font-size: 0.85rem;
  font-weight: 600;
}

/* Loading */
.doc-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 260px;
  padding: 1rem;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 600;
}

.doc-loading-animated > div {
  width: 100%;
}

.doc-loading-animated img {
  width: 150px !important;
  max-width: 45vw !important;
  margin-top: -4px !important;
}

.doc-loading-animated [style*="width: min(320px"] {
  width: min(260px, 72vw) !important;
}

@media (prefers-reduced-motion: reduce) {
  .doc-loading-animated img,
  .doc-loading-animated [style*="animation"] {
    animation: none !important;
  }
}

/* List & Row */
.doc-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.doc-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.doc-row:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.doc-icon-wrap {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.doc-info {
  flex: 1;
  min-width: 0;
}

.doc-filename {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-deep);
  margin-bottom: 0.35rem;
  word-break: break-word;
}

.doc-meta {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  flex-wrap: wrap;
}

.doc-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.doc-file-badge {
  font-size: 0.68rem;
  font-weight: 800;
  padding: 0.15rem 0.55rem;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* Actions */
.doc-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.doc-btn-view {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: #F3F4F6;
  color: #4B5563;
  border: 1px solid #E5E7EB;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.doc-btn-view:hover {
  background: #E5E7EB;
  color: var(--color-deep);
}

.doc-btn-download {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 0.95rem;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-primary), var(--color-deep));
  color: #FFFFFF;
  font-size: 0.85rem;
  font-weight: 700;
  border: none;
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(234, 88, 12, 0.2);
  transition: all var(--transition-fast);
}

.doc-btn-download:hover {
  box-shadow: 0 4px 12px rgba(234, 88, 12, 0.35);
  transform: translateY(-1px);
}

.doc-no-link {
  font-size: 0.78rem;
  color: #9CA3AF;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-style: italic;
}

/* Empty */
.doc-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 3.5rem 1.5rem;
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text-muted);
  gap: 0.75rem;
}

.doc-empty p {
  margin: 0;
  font-size: 0.9rem;
}

/* ============================================================
   KHO ĐỀ THI — 2 LOẠI TÀI LIỆU (Chung / Đề sở)
   ============================================================ */

/* Lưới chứa 2 thẻ loại tài liệu */
.doc-type-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
  margin-bottom: 0.35rem;
}

/* Thẻ loại tài liệu — trông như 2 loại tài liệu riêng biệt */
.doc-type-card {
  position: relative;
  isolation: isolate;
  display: block;
  width: 100%;
  padding: 0;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    transform var(--transition-fast);
}

/* Phần nền chạy theo thẻ đang active (layoutId) */
.doc-type-card-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(135deg, var(--type-tint, rgba(234, 88, 12, 0.14)) 0%, transparent 62%),
    var(--color-surface);
}

.doc-type-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.doc-type-card.active {
  border-color: var(--type-ring, rgba(234, 88, 12, 0.45));
  box-shadow:
    0 0 0 3px var(--type-ring, rgba(234, 88, 12, 0.22)),
    var(--shadow-lg);
}

.doc-type-card-inner {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 1rem 1.15rem;
}

.doc-type-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  flex-shrink: 0;
  border-radius: 14px;
  box-shadow: inset 0 0 0 1px rgba(124, 45, 18, 0.08);
}

.doc-type-text {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
  flex: 1;
}

.doc-type-label {
  font-size: 1.02rem;
  font-weight: 800;
  color: var(--color-text-deep);
  letter-spacing: -0.01em;
}

.doc-type-desc {
  font-size: 0.76rem;
  font-weight: 500;
  color: var(--color-text-muted);
  line-height: 1.45;
}

.doc-type-count {
  flex-shrink: 0;
  align-self: flex-start;
  font-size: 0.7rem;
  font-weight: 800;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-primary);
}

/* Thanh tiêu đề của loại tài liệu đang chọn */
.doc-active-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 0.6rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border-subtle);
}

.doc-active-heading {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  flex-wrap: wrap;
}

.doc-active-title {
  font-size: 1.12rem;
  font-weight: 800;
  color: var(--color-text-deep);
  letter-spacing: -0.015em;
}

/* ============================================================
   KHO ĐỀ THI — CÔNG CỤ QUẢN TRỊ (chỉ hiển thị với Admin)
   ============================================================ */

/* Nhãn "Chế độ Admin" trên tiêu đề trang */
.doc-admin-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  padding: 0.15rem 0.6rem;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-primary), var(--color-amber-dark));
  color: #FFFFFF;
  box-shadow: 0 2px 8px rgba(234, 88, 12, 0.3);
}

/* Nút "Thêm tài liệu" (+) */
.doc-btn-add {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.05rem;
  height: 40px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-primary), var(--color-deep));
  color: #FFFFFF;
  font-size: 0.85rem;
  font-weight: 800;
  border: none;
  cursor: pointer;
  white-space: nowrap;
  box-shadow: 0 2px 10px rgba(234, 88, 12, 0.28);
  transition: all var(--transition-fast);
}

.doc-btn-add:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(234, 88, 12, 0.4);
}

.doc-btn-add:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

/* Khung kéo thả file */
.doc-dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 1.5rem 1.25rem;
  text-align: center;
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, #FFFDFA 0%, var(--color-cream) 140%);
  color: var(--color-primary);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.doc-dropzone:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  box-shadow: var(--shadow-md);
}

.doc-dropzone-text {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-deep);
}

.doc-dropzone-hint {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
  line-height: 1.55;
  max-width: 640px;
}

/* Trạng thái đang kéo file vào trang */
.exam-repo-container.drag-over .doc-dropzone {
  border-color: var(--color-primary);
  border-style: solid;
  background: var(--color-primary-light);
  box-shadow: var(--shadow-glow);
  transform: scale(1.01);
}

.exam-repo-container.drag-over .doc-dropzone-text {
  color: var(--color-primary-hover);
}

@keyframes doc-dropzone-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(234, 88, 12, 0.24); }
  50% { box-shadow: 0 0 0 10px rgba(234, 88, 12, 0); }
}

.exam-repo-container.drag-over .doc-dropzone {
  animation: doc-dropzone-pulse 1.4s ease-out infinite;
}

/* Ô nhập nội dung ngắn (tên thư mục mới) */
.doc-inline-form {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  color: var(--color-primary);
  flex-wrap: wrap;
}

.doc-inline-form input {
  flex: 1;
  min-width: 200px;
  padding: 0.55rem 0.85rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-text-main);
  outline: none;
  transition: all var(--transition-fast);
}

.doc-inline-form input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(234, 88, 12, 0.14);
}

/* Nút Lưu / Huỷ / Xoá */
.doc-btn-save,
.doc-btn-cancel,
.doc-btn-danger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-md);
  font-size: 0.82rem;
  font-weight: 800;
  border: none;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.doc-btn-save {
  background: linear-gradient(135deg, #16A34A, #15803D);
  color: #FFFFFF;
  box-shadow: 0 2px 8px rgba(22, 163, 74, 0.28);
}

.doc-btn-save:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 5px 14px rgba(22, 163, 74, 0.4);
}

.doc-btn-cancel {
  background: #F3F4F6;
  color: #4B5563;
  border: 1px solid #D1D5DB;
}

.doc-btn-cancel:hover:not(:disabled) {
  background: #E5E7EB;
  color: #111827;
}

.doc-btn-danger {
  background: linear-gradient(135deg, #DC2626, #B91C1C);
  color: #FFFFFF;
  box-shadow: 0 2px 8px rgba(220, 38, 38, 0.28);
}

.doc-btn-danger:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 5px 14px rgba(220, 38, 38, 0.4);
}

.doc-btn-save:disabled,
.doc-btn-cancel:disabled,
.doc-btn-danger:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Nút icon nhỏ (đổi tên / xoá) */
.doc-btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: #F3F4F6;
  color: #4B5563;
  border: 1px solid #E5E7EB;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.doc-btn-icon:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
  color: var(--color-primary-hover);
  transform: translateY(-1px);
}

.doc-btn-icon-danger:hover {
  background: var(--color-danger-bg);
  border-color: var(--color-danger);
  color: var(--color-danger);
}

/* Hàng đang ở chế độ đổi tên */
.doc-row.editing {
  border-color: var(--color-primary);
  border-style: dashed;
  background: #FFFDFA;
  box-shadow: var(--shadow-md);
  transform: none;
}

.doc-rename-row {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-wrap: wrap;
  margin-bottom: 0.4rem;
}

.doc-rename-input {
  flex: 1;
  min-width: 180px;
  padding: 0.45rem 0.75rem;
  border: 1.5px solid var(--color-primary);
  border-radius: var(--radius-md);
  background: #FFFFFF;
  font-family: inherit;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-deep);
  outline: none;
  box-shadow: 0 0 0 3px rgba(234, 88, 12, 0.14);
}

.doc-rename-ext {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--color-text-muted);
  font-family: var(--font-code);
}

.doc-rename-hint {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-cream);
  border: 1px solid var(--color-border);
  padding: 0.15rem 0.55rem;
  border-radius: var(--radius-full);
}

/* Gợi ý đường dẫn thật trên Storage (chỉ Admin thấy) */
.doc-path-hint {
  font-family: var(--font-code);
  font-size: 0.7rem;
  background: #F1F5F9;
  border: 1px solid #CBD5E1;
  color: #475569;
  padding: 0.1rem 0.5rem;
  border-radius: var(--radius-sm);
  word-break: break-all;
}

.doc-delete-confirm {
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--color-danger);
  white-space: nowrap;
}

/* Thông báo kết quả thao tác */
.doc-notice {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.8rem 1.15rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 600;
  line-height: 1.5;
  animation: doc-notice-in 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes doc-notice-in {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

.doc-notice-success {
  background: var(--color-success-bg);
  color: #166534;
  border: 1px solid #BBF7D0;
}

.doc-notice-error {
  background: var(--color-danger-bg);
  color: #991B1B;
  border: 1px solid #FECACA;
}

.doc-notice > span {
  flex: 1;
}

.doc-notice-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: none;
  color: inherit;
  cursor: pointer;
  opacity: 0.7;
  transition: all var(--transition-fast);
}

.doc-notice-close:hover {
  opacity: 1;
  background: rgba(0, 0, 0, 0.06);
}

/* Đường dẫn thư mục đang xem (breadcrumb) */
.doc-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  flex-wrap: wrap;
}

.doc-breadcrumb button {
  background: none;
  border: none;
  padding: 0.15rem 0.4rem;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--color-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.doc-breadcrumb button:hover {
  background: var(--color-cream);
  color: var(--color-primary-hover);
  text-decoration: underline;
}

.doc-breadcrumb-current {
  font-weight: 700;
  color: var(--color-deep);
}

/* Thư mục con */
.doc-folder-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.doc-folder-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-full);
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  color: var(--color-deep);
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.doc-folder-chip:hover {
  border-color: var(--color-primary);
  background: var(--color-cream);
  color: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

/* Responsive: màn hình hẹp thì xếp dọc cho dễ bấm */
@media (max-width: 640px) {
  .doc-header-actions {
    width: 100%;
  }

  .doc-header-actions .search-input-wrap {
    flex: 1;
    min-width: 0;
  }

  .doc-btn-add span {
    display: none;
  }

  .doc-btn-add {
    padding: 0.6rem;
    width: 40px;
    justify-content: center;
  }

  .doc-actions {
    flex-wrap: wrap;
    justify-content: flex-end;
  }
}


.exam-filters-bar {
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.filter-pills {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 0.45rem 0.95rem;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-text-muted);
  background: var(--color-bg);
  border: 1px solid var(--color-border-subtle);
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-deep);
}

.filter-btn.active {
  background: var(--color-deep);
  color: #FFFFFF;
  border-color: var(--color-deep);
  box-shadow: 0 2px 8px rgba(124, 45, 18, 0.25);
}

.search-input-wrap {
  position: relative;
  min-width: 280px;
}

.search-input-wrap input {
  width: 100%;
  padding: 0.5rem 1rem 0.5rem 2.4rem;
  border-radius: var(--radius-full);
  border: 1.5px solid var(--color-border);
  background: #FFFDF9;
  font-family: inherit;
  font-size: 0.85rem;
  color: var(--color-text-main);
  outline: none;
}

.search-input-wrap input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(234, 88, 12, 0.15);
}

.search-input-wrap svg {
  position: absolute;
  left: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
}

.exams-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.exam-card {
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.25rem;
  transition: all var(--transition-fast);
  position: relative;
}

.exam-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.exam-badge-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.exam-type-tag {
  font-size: 0.7rem;
  font-weight: 800;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.exam-card-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--color-deep);
  line-height: 1.35;
  margin-top: 0.5rem;
}

.exam-card-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 0.35rem;
}

.exam-card-meta span {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.exam-btn-start {
  width: 100%;
  padding: 0.75rem;
  background: linear-gradient(135deg, var(--color-primary), var(--color-deep));
  color: #FFFFFF;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  box-shadow: 0 4px 12px rgba(234, 88, 12, 0.2);
}

.exam-btn-start:hover {
  box-shadow: 0 6px 16px rgba(234, 88, 12, 0.35);
}

/* ============================================================
   PAGE 4: TẠO BÀI THI THỬ & ĐÁNH GIÁ BẰNG AI (AI Exam Tab)
   ============================================================ */
.ai-exam-container {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.ai-banner-card {
  background: linear-gradient(135deg, #431407 0%, #7C2D12 50%, #C2410C 100%);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.ai-banner-content h2 {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.ai-banner-content p {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.85);
  max-width: 650px;
}

.ai-generator-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.75rem;
}

@media (max-width: 900px) {
  .ai-generator-grid {
    grid-template-columns: 1fr;
  }
}

.config-card {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.config-group-title {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--color-deep);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.selection-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.choice-box {
  padding: 0.85rem 1rem;
  border: 1.5px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  background: #FFFDF9;
  cursor: pointer;
  text-align: left;
  transition: all var(--transition-fast);
}

.choice-box:hover {
  border-color: var(--color-primary);
  background: #FFF7ED;
}

.choice-box.selected {
  border-color: var(--color-primary);
  background: #FFF7ED;
  box-shadow: 0 0 0 2px rgba(234, 88, 12, 0.2);
}

.choice-box-title {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--color-deep);
}

.choice-box-sub {
  font-size: 0.72rem;
  color: var(--color-text-muted);
}

/* AI Evaluation Report Styles */
.ai-report-card {
  background: #FFFFFF;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.ai-direction-control {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.ai-direction-label {
  color: var(--color-deep);
  font-size: 0.9rem;
  font-weight: 800;
}

.ai-direction-description {
  color: var(--color-text-muted);
  font-size: 0.78rem;
  margin-top: 0.2rem;
}

.ai-direction-switch {
  display: inline-flex;
  padding: 4px;
  gap: 4px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: #FFF7ED;
}

.ai-direction-switch button {
  min-height: 40px;
  padding: 0.55rem 0.8rem;
  border-radius: 7px;
  color: var(--color-text-muted);
  font-size: 0.8rem;
  font-weight: 700;
  background: transparent;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.ai-direction-switch button.active {
  color: #FFFFFF;
  background: var(--color-deep);
}

.ai-exam-structure {
  display: grid;
  gap: 0.55rem;
  padding: 0.9rem 1rem;
  border-left: 3px solid var(--color-primary);
  background: #FFF7ED;
  border-radius: 0 8px 8px 0;
  color: var(--color-text-deep);
  font-size: 0.85rem;
}

.ai-exam-structure strong {
  color: var(--color-primary);
  font-size: 1rem;
  font-variant-numeric: tabular-nums;
}

.ai-home-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: #FFFDF9;
}

.ai-home-metric {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.65rem;
  min-width: 0;
  padding: 1rem;
}

.ai-home-metric + .ai-home-metric {
  border-left: 1px solid var(--color-border);
}

.ai-home-metric span {
  color: var(--color-text-muted);
  font-size: 0.8rem;
  font-weight: 600;
}

.ai-home-metric strong {
  color: var(--color-deep);
  font-size: 1.65rem;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.ai-home-metric small {
  margin-left: 0.15rem;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  font-weight: 600;
}

.ai-coach-bubble {
  background: linear-gradient(135deg, #FFF7ED, var(--color-cream));
  border-left: 4px solid var(--color-primary);
  padding: 1.25rem 1.5rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.ai-avatar-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-deep);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 4px 10px rgba(124, 45, 18, 0.2);
}

.score-showcase {
  display: flex;
  align-items: center;
  justify-content: space-around;
  background: #FFFDF9;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  text-align: center;
}

.big-score-digit {
  font-size: 3rem;
  font-weight: 900;
  color: var(--color-primary);
  line-height: 1;
}

/* ============================================================
   INTERACTIVE EXAM RUNNER MODAL / SCREEN
   ============================================================ */
.exam-taker-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(39, 28, 25, 0.65);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.exam-taker-window {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 1100px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 25px 50px -12px rgba(124, 45, 18, 0.25);
  border: 2px solid var(--color-border);
}

.exam-taker-header {
  background: #FFF7ED;
  border-bottom: 1.5px solid var(--color-border);
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.exam-timer-chip {
  background: var(--color-deep);
  color: #FFFFFF;
  padding: 0.45rem 0.95rem;
  border-radius: var(--radius-full);
  font-family: var(--font-code);
  font-weight: 700;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  box-shadow: 0 2px 8px rgba(124, 45, 18, 0.2);
}

.exam-taker-body {
  padding: 1.5rem;
  overflow-y: auto;
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 1.5rem;
}

@media (max-width: 850px) {
  .exam-taker-body {
    grid-template-columns: 1fr;
  }
}

.question-box {
  background: #FFFDF9;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.question-text {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-deep);
  line-height: 1.5;
}

.code-snippet {
  font-family: var(--font-code);
  background: #1C1917;
  color: #FBBF24;
  padding: 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  overflow-x: auto;
}

.options-list {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.option-btn {
  padding: 0.85rem 1rem;
  border: 1.5px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  background: #FFFFFF;
  text-align: left;
  display: flex;
  align-items: center;
  gap: 0.85rem;
  font-size: 0.92rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.option-btn:hover {
  border-color: var(--color-primary);
  background: #FFF7ED;
}

.option-btn.selected {
  border-color: var(--color-primary);
  background: #FFF7ED;
  font-weight: 700;
  color: var(--color-deep);
}

.option-key {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #F3F4F6;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.8rem;
  color: #4B5563;
}

.option-btn.selected .option-key {
  background: var(--color-primary);
  color: #FFFFFF;
}

.question-nav-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.5rem;
}

.q-nav-cell {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 700;
  border: 1.5px solid var(--color-border-subtle);
  background: #FFFFFF;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.q-nav-cell.answered {
  background: var(--color-primary);
  color: #FFFFFF;
  border-color: var(--color-deep);
}

.q-nav-cell.current {
  border-color: var(--color-amber);
  outline: 2px solid var(--color-amber);
}

/* ============================================================
   GOOGLE OAUTH MODAL (Trải nghiệm đăng nhập Google)
   ============================================================ */
.modal-backdrop {
  position: fixed;
  inset: 0;
  overflow: hidden;
  overscroll-behavior: contain;
  background: rgba(39, 28, 25, 0.6);
  backdrop-filter: blur(6px);
  z-index: 1200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  animation: fadeIn 0.2s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.google-auth-card {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 440px;
  padding: 2.25rem;
  box-shadow: 0 20px 40px -10px rgba(124, 45, 18, 0.2);
  border: 1.5px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  animation: slideUp 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideUp {
  from { transform: translateY(15px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.google-auth-header {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.google-logo-svg {
  width: 44px;
  height: 44px;
}

.google-auth-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: #1F2937;
}

.google-auth-subtitle {
  font-size: 0.85rem;
  color: #6B7280;
}

.account-selector-list {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.account-select-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border: 1.5px solid #E5E7EB;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.account-select-item:hover {
  border-color: var(--color-primary);
  background: #FFF7ED;
}

.account-user-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.account-avatar-sm {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.custom-input-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.custom-input-group label {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-deep);
}

.custom-input-group input {
  padding: 0.65rem 0.95rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 0.88rem;
  outline: none;
}

.custom-input-group input:focus {
  border-color: var(--color-primary);
}

/* Toast Notifications */
.toast-notice {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 2000;
  background: var(--color-deep);
  color: #FFFFFF;
  padding: 0.85rem 1.4rem;
  border-radius: var(--radius-md);
  box-shadow: 0 10px 25px rgba(124, 45, 18, 0.35);
  border-left: 5px solid var(--color-amber);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.88rem;
  font-weight: 600;
  animation: slideInRight 0.3s ease-out;
}

@keyframes slideInRight {
  from { transform: translateX(100px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* ============================================================
   LOGIN PAGE — TinHocPro Google OAuth UI
   ============================================================ */

.login-page-root {
  min-height: 100vh;
  background: linear-gradient(135deg, #FFF9F2 0%, #FFFCF7 50%, #FFF1D6 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: 1.5rem;
}

/* Ambient background blobs */
.login-blob {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
}
.login-blob-1 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(234, 88, 12, 0.14) 0%, transparent 70%);
  top: -150px;
  right: -100px;
  animation: blobDrift1 12s ease-in-out infinite alternate;
}
.login-blob-2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(251, 191, 36, 0.16) 0%, transparent 70%);
  bottom: -100px;
  left: -80px;
  animation: blobDrift2 15s ease-in-out infinite alternate;
}
.login-blob-3 {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(124, 45, 18, 0.08) 0%, transparent 70%);
  top: 50%;
  left: 40%;
  transform: translate(-50%, -50%);
  animation: blobDrift3 10s ease-in-out infinite alternate;
}

@keyframes blobDrift1 {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(-40px, 30px) scale(1.12); }
}
@keyframes blobDrift2 {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(30px, -25px) scale(1.08); }
}
@keyframes blobDrift3 {
  from { transform: translate(-50%, -50%) scale(1); }
  to   { transform: translate(-50%, -50%) scale(1.15); }
}

/* Split Layout */
.login-split-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  max-width: 1040px;
  width: 100%;
  min-height: 620px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow:
    0 25px 60px -10px rgba(124, 45, 18, 0.18),
    0 10px 30px -5px rgba(234, 88, 12, 0.12),
    0 0 0 1px rgba(234, 88, 12, 0.08);
  position: relative;
  z-index: 1;
  opacity: 0;
  transform: translateY(28px) scale(0.97);
  transition: opacity 0.55s cubic-bezier(0.22, 1, 0.36, 1), transform 0.55s cubic-bezier(0.22, 1, 0.36, 1);
}
.login-split-layout.login-float-in {
  opacity: 1;
  transform: translateY(0) scale(1);
}

/* LEFT — Branding Panel */
.login-brand-panel {
  background: linear-gradient(145deg, #7C2D12 0%, #C2410C 40%, #EA580C 75%, #FBBF24 100%);
  padding: 3rem 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
.login-brand-panel::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 80% 20%, rgba(255,255,255,0.12) 0%, transparent 50%),
    radial-gradient(circle at 20% 80%, rgba(0,0,0,0.15) 0%, transparent 50%);
  pointer-events: none;
}
.login-brand-inner {
  position: relative;
  z-index: 1;
}

/* Logo */
.login-logo-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 2rem;
}
.login-logo-icon {
  width: 48px;
  height: 48px;
  background: rgba(255,255,255,0.18);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.25);
  overflow: hidden;
}
.login-logo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: inherit;
  display: block;
}
.login-logo-name {
  font-size: 1.25rem;
  font-weight: 900;
  color: #fff;
  letter-spacing: -0.03em;
}
.login-logo-sub {
  font-size: 0.72rem;
  color: rgba(255,255,255,0.72);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.login-brand-headline {
  font-size: 2.1rem;
  font-weight: 900;
  color: #fff;
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}
.login-brand-highlight {
  color: #FEF3C7;
  position: relative;
}
.login-brand-desc {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.78);
  line-height: 1.65;
  margin-bottom: 1.75rem;
  max-width: 320px;
}

/* Feature rows */
.login-features-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 2rem;
}
.login-feature-row {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-size: 0.84rem;
  color: rgba(255,255,255,0.9);
  font-weight: 600;
}
.login-feature-icon {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* Stats row */
.login-stats-row {
  display: flex;
  gap: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.18);
}
.login-stat-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.login-stat-value {
  font-size: 1.35rem;
  font-weight: 900;
  color: #FEF3C7;
  letter-spacing: -0.03em;
}
.login-stat-label {
  font-size: 0.72rem;
  color: rgba(255,255,255,0.65);
  font-weight: 600;
}

/* RIGHT — Auth Panel */
.login-auth-panel {
  background: #FFFCF7;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2.5rem 2rem;
  gap: 1rem;
}

.login-auth-card {
  width: 100%;
  max-width: 380px;
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow:
    0 4px 20px rgba(124, 45, 18, 0.06),
    0 1px 4px rgba(124, 45, 18, 0.04),
    0 0 0 1px rgba(234, 88, 12, 0.07);
  position: relative;
  overflow: hidden;
}

.login-g-watermark {
  position: absolute;
  right: -12px;
  bottom: -12px;
  opacity: 0.06;
  pointer-events: none;
}

.login-auth-inner {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: relative;
  z-index: 1;
}

.login-auth-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  text-align: center;
  padding-bottom: 0.5rem;
}
.login-auth-title {
  font-size: 1.18rem;
  font-weight: 800;
  color: var(--color-deep);
  letter-spacing: -0.02em;
}
.login-auth-subtitle {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* Google Sign-in Button */
.login-google-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  padding: 0.8rem 1.25rem;
  background: #fff;
  border: 2px solid #E5E7EB;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  font-weight: 700;
  color: #1F2937;
  cursor: pointer;
  font-family: var(--font-main);
  transition: all var(--transition-fast);
  position: relative;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}
.login-google-btn:hover:not(:disabled) {
  border-color: #EA580C;
  box-shadow: 0 0 0 3px rgba(234, 88, 12, 0.12), 0 2px 8px rgba(0,0,0,0.08);
  transform: translateY(-1px);
}
.login-google-btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}
.login-btn-arrow {
  margin-left: auto;
  color: var(--color-primary);
}

/* Divider */
.login-divider {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: #9CA3AF;
  font-size: 0.75rem;
  font-weight: 600;
}
.login-divider::before,
.login-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: #E5E7EB;
}

/* Secondary button */
.login-custom-btn {
  width: 100%;
  padding: 0.7rem 1rem;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  font-family: var(--font-main);
  transition: all var(--transition-fast);
}
.login-custom-btn:hover {
  background: #FFEDD5;
  border-color: var(--color-primary);
  transform: translateY(-1px);
}

/* Account list */
.login-account-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.login-account-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0.85rem;
  background: #FAFAFA;
  border: 1.5px solid #F3F4F6;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-family: var(--font-main);
  transition: all var(--transition-fast);
  width: 100%;
  text-align: left;
}
.login-account-item:hover:not(:disabled) {
  background: #FFF7ED;
  border-color: var(--color-border);
  box-shadow: 0 2px 8px rgba(234, 88, 12, 0.08);
  transform: translateX(3px);
}
.login-account-item:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}
.login-account-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid rgba(234, 88, 12, 0.15);
  flex-shrink: 0;
}
.login-account-info {
  flex: 1;
  min-width: 0;
}
.login-account-name {
  font-size: 0.88rem;
  font-weight: 700;
  color: #1F2937;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.login-account-email {
  font-size: 0.74rem;
  color: #6B7280;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.login-account-arrow {
  color: #D1D5DB;
  flex-shrink: 0;
  transition: color var(--transition-fast);
}
.login-account-item:hover .login-account-arrow {
  color: var(--color-primary);
}

/* Back button */
.login-back-btn {
  align-self: flex-start;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-muted);
  cursor: pointer;
  font-family: var(--font-main);
  padding: 4px 0;
  transition: color var(--transition-fast);
}
.login-back-btn:hover {
  color: var(--color-primary);
}

/* Custom form */
.login-custom-form {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}
.login-field-group {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.login-field-group label {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-deep);
  letter-spacing: 0.01em;
}
.login-required { color: var(--color-danger); }
.login-optional { color: var(--color-text-muted); font-weight: 500; }

.login-input {
  width: 100%;
  padding: 0.65rem 0.85rem;
  border: 1.5px solid #E5E7EB;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-family: var(--font-main);
  color: #1F2937;
  background: #FAFAFA;
  transition: all var(--transition-fast);
  outline: none;
}
.login-input:focus {
  border-color: var(--color-primary);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(234, 88, 12, 0.1);
}
.login-input::placeholder {
  color: #9CA3AF;
}

/* Security note */
.login-security-note {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  font-size: 0.72rem;
  color: #9CA3AF;
  padding-top: 0.25rem;
}

/* Spinner */
.login-spinner {
  width: 18px;
  height: 18px;
  border: 2.5px solid rgba(234, 88, 12, 0.2);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: loginSpin 0.7s linear infinite;
  flex-shrink: 0;
}
.login-spinner-white {
  border-color: rgba(255,255,255,0.3);
  border-top-color: #fff;
}
@keyframes loginSpin {
  to { transform: rotate(360deg); }
}

/* Footer note */
.login-footer-note {
  font-size: 0.72rem;
  color: #9CA3AF;
  text-align: center;
  max-width: 360px;
  line-height: 1.5;
}
.login-footer-link {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: none;
}
.login-footer-link:hover {
  text-decoration: underline;
}

/* Responsive: stack on small screens */
@media (max-width: 768px) {
  .login-split-layout {
    grid-template-columns: 1fr;
    max-width: 440px;
    min-height: unset;
  }
  .login-brand-panel {
    padding: 2rem 1.75rem;
    display: none; /* Hide brand on mobile to keep it clean */
  }
  .login-auth-panel {
    padding: 2rem 1.25rem;
  }
  .login-brand-headline {
    font-size: 1.6rem;
  }
}
@media (max-width: 480px) {
  .login-page-root {
    padding: 1rem;
    align-items: flex-start;
    padding-top: 2rem;
  }
  .login-split-layout {
    max-width: 100%;
  }
}

/* ============================================================
   Terms & Privacy Modal
   ============================================================ */
.terms-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  animation: termsOverlayIn 0.25s ease-out;
}
@keyframes termsOverlayIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.terms-modal-container {
  background: #fff;
  border-radius: 20px;
  width: 100%;
  max-width: 720px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow:
    0 25px 80px -12px rgba(0, 0, 0, 0.25),
    0 0 0 1px rgba(234, 88, 12, 0.08);
  animation: termsSlideUp 0.35s cubic-bezier(0.22, 1, 0.36, 1);
  overflow: hidden;
}
@keyframes termsSlideUp {
  from { opacity: 0; transform: translateY(24px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* Header */
.terms-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid #F3F4F6;
  flex-shrink: 0;
}
.terms-modal-header-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.terms-modal-logo {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  overflow: hidden;
  flex-shrink: 0;
  border: 1px solid #F3F4F6;
}
.terms-modal-brand {
  font-size: 1.05rem;
  font-weight: 800;
  color: #1F2937;
  letter-spacing: -0.02em;
}
.terms-modal-date {
  font-size: 0.72rem;
  color: #9CA3AF;
  font-weight: 500;
}
.terms-modal-close {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  border: 1px solid #E5E7EB;
  background: #FAFAFA;
  color: #6B7280;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
  flex-shrink: 0;
}
.terms-modal-close:hover {
  background: #FEE2E2;
  border-color: #FCA5A5;
  color: #DC2626;
}

/* Tabs */
.terms-modal-tabs {
  display: flex;
  gap: 0;
  padding: 0 1.5rem;
  border-bottom: 1px solid #F3F4F6;
  flex-shrink: 0;
  background: #FAFAFA;
}
.terms-modal-tab {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.85rem 1.25rem;
  font-size: 0.84rem;
  font-weight: 700;
  color: #6B7280;
  background: none;
  border: none;
  border-bottom: 2.5px solid transparent;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-main);
  margin-bottom: -1px;
  white-space: nowrap;
}
.terms-modal-tab:hover {
  color: #EA580C;
  background: rgba(234, 88, 12, 0.04);
}
.terms-modal-tab.active {
  color: #EA580C;
  border-bottom-color: #EA580C;
  background: #fff;
}

/* Body */
.terms-modal-body {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
  scrollbar-width: thin;
  scrollbar-color: #E5E7EB transparent;
}
.terms-modal-body::-webkit-scrollbar {
  width: 6px;
}
.terms-modal-body::-webkit-scrollbar-track {
  background: transparent;
}
.terms-modal-body::-webkit-scrollbar-thumb {
  background: #D1D5DB;
  border-radius: 3px;
}
.terms-modal-body::-webkit-scrollbar-thumb:hover {
  background: #9CA3AF;
}

/* Footer */
.terms-modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid #F3F4F6;
  flex-shrink: 0;
  display: flex;
  justify-content: flex-end;
}
.terms-modal-accept-btn {
  padding: 0.65rem 1.5rem;
  background: linear-gradient(135deg, #EA580C, #C2410C);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
  font-family: var(--font-main);
  transition: all 0.2s;
  box-shadow: 0 2px 8px rgba(234, 88, 12, 0.25);
}
.terms-modal-accept-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(234, 88, 12, 0.35);
}

/* Content */
.terms-content {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.terms-intro {
  padding: 1rem 1.25rem;
  background: linear-gradient(135deg, #FFF7ED, #FFFBF5);
  border-radius: 12px;
  border: 1px solid #FFEDD5;
}
.terms-intro p {
  font-size: 0.84rem;
  color: #92400E;
  line-height: 1.65;
  font-weight: 500;
  margin: 0;
}

/* Section */
.terms-section {
  border: 1px solid #F3F4F6;
  border-radius: 14px;
  overflow: hidden;
  background: #fff;
}
.terms-section-header {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.85rem 1.15rem;
  background: #FAFAFA;
  border-bottom: 1px solid #F3F4F6;
}
.terms-section-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.terms-section-title {
  font-size: 0.92rem;
  font-weight: 800;
  color: #1F2937;
  letter-spacing: -0.01em;
  margin: 0;
}
.terms-section-content {
  padding: 1rem 1.15rem;
  font-size: 0.82rem;
  color: #374151;
  line-height: 1.7;
}
.terms-section-content p {
  margin: 0 0 0.65rem 0;
}
.terms-section-content p:last-child {
  margin-bottom: 0;
}
.terms-section-content ul {
  margin: 0.5rem 0;
  padding-left: 1.35rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.terms-section-content li {
  line-height: 1.65;
}
.terms-section-content li strong {
  color: #1F2937;
}

/* Subsections */
.terms-subsection {
  margin-top: 0.85rem;
  padding-top: 0.65rem;
  border-top: 1px dashed #E5E7EB;
}
.terms-subsection:first-of-type {
  margin-top: 0.5rem;
  padding-top: 0;
  border-top: none;
}
.terms-subsection h4 {
  font-size: 0.82rem;
  font-weight: 700;
  color: #374151;
  margin: 0 0 0.35rem 0;
}

/* Highlight Boxes */
.terms-highlight-box {
  padding: 0.75rem 1rem;
  border-radius: 10px;
  font-size: 0.82rem;
  font-weight: 600;
  line-height: 1.6;
  margin-bottom: 0.75rem;
}
.terms-highlight-warning {
  background: #FEF3C7;
  border: 1px solid #FDE68A;
  color: #92400E;
}
.terms-highlight-info {
  background: #EFF6FF;
  border: 1px solid #BFDBFE;
  color: #1E40AF;
}
.terms-highlight-note {
  background: #F0FDF4;
  border: 1px solid #BBF7D0;
  color: #166534;
}

/* Table */
.terms-table-wrapper {
  margin: 0.75rem 0;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid #E5E7EB;
}
.terms-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}
.terms-table th {
  background: #F9FAFB;
  padding: 0.65rem 0.85rem;
  text-align: left;
  font-weight: 700;
  color: #374151;
  border-bottom: 1px solid #E5E7EB;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.terms-table td {
  padding: 0.65rem 0.85rem;
  border-bottom: 1px solid #F3F4F6;
  color: #4B5563;
  line-height: 1.55;
  vertical-align: top;
}
.terms-table tr:last-child td {
  border-bottom: none;
}
.terms-table td:first-child {
  width: 130px;
  white-space: nowrap;
  color: #1F2937;
}
.terms-table tr:nth-child(even) {
  background: #FAFAFA;
}

/* Responsive */
@media (max-width: 640px) {
  .terms-modal-overlay {
    padding: 0.75rem;
    align-items: flex-end;
  }
  .terms-modal-container {
    max-height: 92vh;
    border-radius: 20px 20px 0 0;
    animation: termsSlideMobileUp 0.35s cubic-bezier(0.22, 1, 0.36, 1);
  }
  @keyframes termsSlideMobileUp {
    from { opacity: 0; transform: translateY(100%); }
    to   { opacity: 1; transform: translateY(0); }
  }
  .terms-modal-header {
    padding: 1rem 1.15rem;
  }
  .terms-modal-tabs {
    padding: 0 1rem;
  }
  .terms-modal-tab {
    padding: 0.75rem 0.85rem;
    font-size: 0.78rem;
  }
  .terms-modal-body {
    padding: 1rem;
  }
  .terms-modal-footer {
    padding: 0.85rem 1rem;
  }
  .terms-table td:first-child {
    width: auto;
    white-space: normal;
  }
}

/* ============================================================
   Botpress Floating Bubble Chat Component Styles
   ============================================================ */
.botpress-floating-bubble-wrap {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
}

.botpress-mascot-btn {
  background: transparent !important;
  border: none !important;
  padding: 0 !important;
  cursor: pointer;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  outline: none;
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.botpress-mascot-btn:hover {
  transform: translateY(-5px) scale(1.08);
}

.botpress-mascot-btn:active {
  transform: scale(0.95);
}

.botpress-mascot-inner {
  position: relative;
  width: 70px;
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.botpress-mascot-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  /* Đổ bóng tự nhiên theo đúng viền mặt con mèo đã xóa nền */
  filter: drop-shadow(0 6px 14px rgba(234, 88, 12, 0.42)) drop-shadow(0 2px 4px rgba(0, 0, 0, 0.15));
  transition: filter 0.3s ease;
  animation: mascotFloat 3s ease-in-out infinite;
}

.botpress-mascot-btn:hover .botpress-mascot-img {
  filter: drop-shadow(0 10px 22px rgba(234, 88, 12, 0.6)) drop-shadow(0 4px 8px rgba(0, 0, 0, 0.2));
}

@keyframes mascotFloat {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-4px);
  }
}

.botpress-mascot-ping {
  position: absolute;
  top: 4px;
  right: 6px;
  width: 12px;
  height: 12px;
  background: #10B981;
  border: 2px solid #FFFFFF;
  border-radius: 50%;
  box-shadow: 0 0 8px #10B981;
  animation: pulse-ping 2s cubic-bezier(0, 0, 0.2, 1) infinite;
  z-index: 2;
}

/* Tooltip mời chat phía trên chú mèo */
.botpress-mascot-tooltip {
  position: absolute;
  bottom: calc(100% + 4px);
  background: #FFFFFF;
  color: var(--color-deep);
  border: 1.5px solid var(--color-border);
  font-size: 0.72rem;
  font-weight: 800;
  padding: 3px 9px;
  border-radius: 999px;
  box-shadow: 0 4px 12px rgba(124, 45, 18, 0.12);
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transform: translateY(4px);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.botpress-mascot-tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border-width: 5px;
  border-style: solid;
  border-color: #FFFFFF transparent transparent transparent;
}

.botpress-mascot-btn:hover .botpress-mascot-tooltip {
  opacity: 1;
  transform: translateY(0);
}

/* Chat Window Modal */
.botpress-chat-window {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 390px;
  max-width: calc(100vw - 32px);
  height: 580px;
  max-height: calc(100vh - 48px);
  background: var(--color-surface);
  border-radius: 20px;
  box-shadow: 0 16px 45px rgba(67, 20, 7, 0.2), 0 2px 8px rgba(0, 0, 0, 0.08);
  border: 1.5px solid var(--color-border);
  display: flex;
  flex-direction: column;
  z-index: 10000;
  overflow: hidden;
  animation: botpressSlideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes botpressSlideUp {
  from { opacity: 0; transform: translateY(20px) scale(0.96); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* Header */
.botpress-header {
  padding: 0.9rem 1rem;
  background: linear-gradient(135deg, var(--color-deep) 0%, #431407 100%);
  color: #FFF;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.botpress-header-left {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.botpress-avatar {
  position: relative;
  width: 38px;
  height: 38px;
  min-width: 38px;
  min-height: 38px;
  background: #FFFFFF;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
  flex-shrink: 0;
}

.botpress-avatar-img {
  width: 100%;
  height: 100%;
  max-width: 38px;
  max-height: 38px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
}

.botpress-status-dot {
  position: absolute;
  bottom: -1px;
  right: -1px;
  width: 10px;
  height: 10px;
  background: #10B981;
  border: 2px solid #FFF;
  border-radius: 50%;
  z-index: 2;
}

.botpress-header-info {
  display: flex;
  flex-direction: column;
}

.botpress-title {
  font-size: 0.9rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.botpress-pill-badge {
  font-size: 0.65rem;
  background: rgba(255, 255, 255, 0.2);
  padding: 1px 6px;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 700;
}

.botpress-subtitle {
  font-size: 0.7rem;
  opacity: 0.8;
}

.botpress-header-actions {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.botpress-header-btn {
  background: rgba(255, 255, 255, 0.12);
  border: none;
  color: #FFF;
  width: 30px;
  height: 30px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.2s;
}

.botpress-header-btn:hover,
.botpress-header-btn.active {
  background: rgba(255, 255, 255, 0.28);
}

/* Demo Banner */
.botpress-demo-banner {
  background: #FFFBEB;
  border-bottom: 1px solid #FDE68A;
  padding: 0.45rem 0.85rem;
  font-size: 0.72rem;
  color: #B45309;
  line-height: 1.35;
}

/* Settings / API Tools Panel */
.botpress-settings-panel {
  flex: 1;
  padding: 1.15rem;
  overflow-y: auto;
  background: #FAF7F2;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.botpress-settings-header {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.88rem;
  color: var(--color-deep);
}

.botpress-settings-desc {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  line-height: 1.45;
}

.botpress-form-group {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.botpress-form-group label {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--color-text-deep);
}

.botpress-input-field {
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--color-border);
  font-family: var(--font-code);
  font-size: 0.78rem;
  background: #FFF;
  outline: none;
}

.botpress-input-field:focus {
  border-color: var(--color-primary);
}

.botpress-curl-box {
  background: #1E1E2E;
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.botpress-curl-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.7rem;
  color: #94A3B8;
  font-family: var(--font-code);
}

.botpress-btn-copy {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  background: rgba(255, 255, 255, 0.15);
  border: none;
  color: #FFF;
  padding: 2px 7px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.68rem;
}

.botpress-curl-code {
  font-family: var(--font-code);
  font-size: 0.72rem;
  color: #38BDF8;
  white-space: pre-wrap;
  word-break: break-all;
  line-height: 1.35;
  margin: 0;
}

.botpress-btn-test {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  background: var(--color-primary);
  color: #FFF;
  border: none;
  padding: 0.6rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
}

.botpress-btn-test:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.botpress-btn-back {
  background: #FFF;
  border: 1.5px solid var(--color-border);
  color: var(--color-deep);
  padding: 0.6rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
}

.botpress-test-result {
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  line-height: 1.4;
}

.botpress-test-result.success {
  background: #ECFDF5;
  border: 1px solid #A7F3D0;
  color: #065F46;
}

.botpress-test-result.error {
  background: #FEF2F2;
  border: 1px solid #FECACA;
  color: #991B1B;
}

/* Chat Messages Area */
.botpress-messages-area {
  flex: 1;
  padding: 1rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  /* Nền đoạn chat: ảnh con mèo CamCam, phủ nhẹ để tin nhắn dễ đọc */
  background-color: #FFFCF7;
  background-image:
    linear-gradient(180deg, rgba(255,252,247,0.55) 0%, rgba(255,252,247,0.80) 100%),
    url('/assets/cat-chat-bg-BlCEZYb4.png');
  background-repeat: no-repeat;
  /* Neo phần DƯỚI của ảnh nền con mèo */
  background-position: center bottom;
  background-size: cover;
}

.botpress-msg-bubble {
  display: flex;
  max-width: 85%;
}

.botpress-msg-bubble.user-msg {
  align-self: flex-end;
}

.botpress-msg-bubble.bot-msg {
  align-self: flex-start;
  display: flex;
  gap: 0.5rem;
  align-items: flex-start;
}

.botpress-msg-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  margin-top: 2px;
  border: 1.5px solid var(--color-border);
  background: #FFF;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.botpress-msg-content {
  padding: 0.65rem 0.9rem;
  border-radius: 16px;
  font-size: 0.82rem;
  line-height: 1.45;
}

.user-msg .botpress-msg-content {
  background: linear-gradient(135deg, var(--color-primary) 0%, #C2410C 100%);
  color: #FFF;
  border-bottom-right-radius: 4px;
}

.bot-msg .botpress-msg-content {
  background: #FFF;
  border: 1.5px solid var(--color-border);
  color: var(--color-deep);
  border-bottom-left-radius: 4px;
  box-shadow: var(--shadow-sm);
}

/* Rich Formatted Chat Message Styles (Bullet Lists, Bold, Headings, Paragraphs) */
.botpress-formatted-text {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  line-height: 1.55;
}

.chat-paragraph {
  margin: 0;
  font-size: 0.84rem;
  color: inherit;
  word-break: break-word;
  line-height: 1.55;
}

.chat-heading {
  font-size: 0.88rem;
  font-weight: 800;
  color: var(--color-deep);
  margin-top: 0.45rem;
  margin-bottom: 0.15rem;
  padding-bottom: 0.2rem;
  border-bottom: 1.5px dashed var(--color-border);
  letter-spacing: -0.01em;
}

.chat-bullet-list {
  list-style: none;
  padding: 0;
  margin: 0.25rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  background: #FFFDF9;
  border: 1px solid var(--color-border-subtle);
  border-radius: 8px;
  padding: 0.5rem 0.65rem;
}

.chat-bullet-item {
  display: flex;
  align-items: flex-start;
  gap: 0.45rem;
  font-size: 0.83rem;
  line-height: 1.5;
}

.chat-bullet-icon {
  color: var(--color-primary);
  font-weight: 900;
  font-size: 1.05rem;
  line-height: 1.1;
  flex-shrink: 0;
  margin-top: 1px;
}

.chat-bullet-text {
  flex: 1;
  word-break: break-word;
  color: var(--color-deep);
}

.chat-strong {
  font-weight: 800;
  color: var(--color-deep);
}

.user-msg .chat-strong {
  color: #FFF;
}

.chat-em {
  font-style: italic;
  opacity: 0.9;
}

.chat-inline-code {
  font-family: var(--font-code);
  font-size: 0.76rem;
  background: rgba(234, 88, 12, 0.08);
  color: var(--color-primary);
  border: 1px solid rgba(234, 88, 12, 0.2);
  padding: 1px 5px;
  border-radius: 4px;
}

.user-msg .chat-inline-code {
  background: rgba(255, 255, 255, 0.2);
  color: #FFF;
  border-color: rgba(255, 255, 255, 0.3);
}

.botpress-msg-time {
  font-size: 0.62rem;
  opacity: 0.7;
  margin-top: 0.25rem;
  text-align: right;
}

.botpress-typing-dots {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0.65rem 1rem;
  background: #FFF;
  border: 1px solid var(--color-border);
  border-radius: 16px;
}

.botpress-typing-dots span {
  width: 6px;
  height: 6px;
  background: var(--color-primary);
  border-radius: 50%;
  animation: typing-bounce 1.4s infinite ease-in-out both;
}

.botpress-typing-dots span:nth-child(1) { animation-delay: -0.32s; }
.botpress-typing-dots span:nth-child(2) { animation-delay: -0.16s; }

@keyframes typing-bounce {
  0%, 80%, 100% { transform: scale(0); }
  40% { transform: scale(1); }
}

/* Input Box */
.botpress-input-box {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: #FFF;
  border-top: 1.5px solid var(--color-border);
}

.botpress-chat-input {
  flex: 1;
  border: 1.5px solid var(--color-border);
  border-radius: 999px;
  padding: 0.55rem 1rem;
  font-size: 0.85rem;
  font-family: var(--font-main);
  outline: none;
  background: var(--color-bg);
}

.botpress-chat-input:focus {
  border-color: var(--color-primary);
  background: #FFF;
}

.botpress-send-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: none;
  background: var(--color-primary);
  color: #FFF;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.2s;
  flex-shrink: 0;
}

.botpress-send-btn:hover:not(:disabled) {
  background: var(--color-primary-hover);
}

.botpress-send-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.spin-icon {
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ============================================================
   SITE FOOTER (MewTinHoc THPTQG)
   ============================================================ */
.site-footer {
  margin-top: auto;
  border-top: 1.5px solid var(--color-border);
  background: linear-gradient(180deg, #FFF9F2 0%, var(--color-cream) 100%);
  padding: 2.25rem 1.5rem 1.5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 12% 0%, rgba(251, 191, 36, 0.18) 0%, transparent 42%),
    radial-gradient(circle at 88% 100%, rgba(234, 88, 12, 0.12) 0%, transparent 45%);
  pointer-events: none;
}

.site-footer-inner {
  position: relative;
  z-index: 1;
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.9rem;
}

/* Brand block */
.site-footer-brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.site-footer-logo {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-primary), var(--color-deep));
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  box-shadow: var(--shadow-glow);
  flex-shrink: 0;
}

.site-footer-logo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.site-footer-brand-text {
  text-align: left;
}

.site-footer-brand-name {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-deep);
  line-height: 1.1;
}

.site-footer-brand-accent {
  color: var(--color-primary);
  text-shadow: 0 0 14px rgba(234, 88, 12, 0.35);
}

.site-footer-brand-name-text {
  color: var(--color-deep);
}

.site-footer-brand-tag {
  font-size: 0.66rem;
  font-weight: 800;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-amber), var(--color-primary));
  color: #ffffff;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  box-shadow: 0 2px 8px rgba(234, 88, 12, 0.3);
}

.site-footer-brand-slogan {
  font-size: 0.74rem;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-top: 0.15rem;
}

/* Mô tả */
.site-footer-desc {
  font-size: 0.83rem;
  line-height: 1.6;
  color: var(--color-text-muted);
  max-width: 680px;
}

/* Dải highlight */
.site-footer-highlight {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 0.75rem;
  margin-top: 0.15rem;
}

.site-footer-highlight-item {
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--color-deep);
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--color-border);
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.site-footer-highlight-item:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.site-footer-highlight-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-amber);
  flex-shrink: 0;
}

/* Hàng dưới */
.site-footer-bottom {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  margin-top: 0.5rem;
  padding-top: 0.9rem;
  width: 100%;
  max-width: 780px;
  border-top: 1px dashed var(--color-border);
  font-size: 0.76rem;
  color: var(--color-text-muted);
}

.site-footer-copyright strong {
  color: var(--color-deep);
  font-weight: 800;
}

.site-footer-account strong {
  color: var(--color-primary);
  font-weight: 800;
}

/* Footer trên mobile */
@media (max-width: 640px) {
  .site-footer {
    padding: 1.5rem 1rem 1.15rem;
  }

  .site-footer-brand-name {
    font-size: 1.1rem;
  }

  .site-footer-logo {
    width: 40px;
    height: 40px;
  }

  .site-footer-desc {
    font-size: 0.78rem;
  }

  .site-footer-highlight {
    gap: 0.4rem 0.5rem;
  }

  .site-footer-highlight-item {
    font-size: 0.7rem;
    padding: 0.26rem 0.6rem;
  }

  .site-footer-bottom {
    flex-direction: column;
    gap: 0.35rem;
    font-size: 0.72rem;
  }
}

/* ============================================================
   MOBILE-FIRST RESPONSIVE OPTIMIZATION
   ============================================================ */

/* Mobile viewport (<= 640px) */
@media (max-width: 640px) {
  /* 1. Botpress Chat Bubble & Fullscreen Modal on Mobile */
  .botpress-floating-bubble-wrap {
    bottom: 12px;
    right: 12px;
  }

  .botpress-mascot-inner {
    width: 58px;
    height: 58px;
  }

  .botpress-mascot-tooltip {
    display: none; /* Ẩn tooltip trên mobile */
  }

  .botpress-chat-window {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    right: 0 !important;
    bottom: 0 !important;
    width: 100vw !important;
    max-width: 100vw !important;
    height: 100dvh !important;
    max-height: 100dvh !important;
    border-radius: 0 !important;
    border: none !important;
    margin: 0 !important;
    z-index: 99999 !important;
  }

  .botpress-header {
    padding: 0.75rem 0.9rem;
    padding-top: max(0.75rem, env(safe-area-inset-top));
    border-radius: 0;
  }

  .botpress-header-btn {
    width: 34px;
    height: 34px;
  }

  .botpress-messages-area {
    padding: 0.75rem;
    gap: 0.65rem;
  }

  .botpress-msg-bubble {
    max-width: 90%;
  }

  .botpress-msg-content {
    font-size: 0.82rem;
    padding: 0.6rem 0.8rem;
  }

  .botpress-input-box {
    padding: 0.65rem 0.75rem;
    padding-bottom: max(0.75rem, env(safe-area-inset-bottom));
  }

  .botpress-chat-input {
    font-size: 16px !important; /* Chống iOS Safari tự động zoom trang khi focus input */
    padding: 0.5rem 0.85rem;
  }

  .botpress-send-btn {
    width: 36px;
    height: 36px;
  }

  /* 2. Top Header & Navigation Bar on Mobile */
  .top-nav-row {
    padding: 0.45rem 0.65rem;
    gap: 0.5rem;
    justify-content: space-between;
  }

  .brand-section {
    gap: 0.5rem;
  }

  .brand-logo-icon {
    width: 34px;
    height: 34px;
    border-radius: 9px;
  }

  .brand-title {
    font-size: 1.05rem;
    line-height: 1.15;
  }

  .brand-tag {
    display: none !important; /* Ẩn tag nhỏ để tiết kiệm không gian màn hình */
  }

  .brand-slogan {
    display: none !important; /* Ẩn slogan dài trên mobile để navbar không bị tràn mép */
  }

  .student-bar-widget {
    gap: 0.35rem;
    align-items: center;
  }

  .streak-pill {
    padding: 0.22rem 0.45rem;
    gap: 0.25rem;
  }

  .streak-number {
    font-size: 0.78rem;
    font-weight: 800;
  }

  .streak-label {
    display: none !important; /* Rút gọn chỉ hiện số ngày streak */
  }

  .student-profile-chip {
    padding: 2px;
    max-width: 32px;
    background: transparent;
    border: none;
    box-shadow: none;
  }

  .student-name {
    display: none !important; /* Chỉ hiển thị ảnh đại diện tròn gọn gàng */
  }

  .student-avatar {
    width: 28px;
    height: 28px;
  }

  .student-logout-btn {
    width: 28px;
    height: 28px;
    padding: 0;
  }

  /* 3. Navigation Tabs Bar (Category Dock) */
  .category-dock-wrapper {
    padding: 0.2rem 0.5rem;
  }

  .category-dock {
    gap: 0.4rem;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .category-badge {
    display: none !important; /* Ẩn nhãn tĩnh LEARNING trên mobile */
  }

  .category-tabs {
    width: 100%;
    display: flex;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    gap: 0.35rem;
    /* Mobile: dock tự cuộn ngang nên không dùng margin âm, chỉ chừa đệm cho pill */
    padding: 4px 4px 6px;
    margin: 0;
  }

  .category-tabs::-webkit-scrollbar {
    display: none;
  }

  .nav-tab-btn {
    flex-shrink: 0;
    padding: 0.45rem 0.65rem;
    font-size: 0.78rem;
    white-space: nowrap;
    gap: 0.35rem;
  }

  /* Chuyển đổi nhãn tab sang phiên bản ngắn gọn cho mobile */
  .tab-label-full {
    display: none !important;
  }

  .tab-label-short {
    display: inline !important;
  }

  /* 4. Main Content Layout on Mobile */
  .main-content {
    padding: 0.75rem 0.6rem 3rem 0.6rem;
  }

  /* 5. Home Dashboard & Hero Banner on Mobile */
  .home-grid {
    grid-template-columns: 1fr !important;
    gap: 1.25rem !important;
  }

  .hero-welcome-card {
    padding: 1.3rem 1rem;
    border-radius: var(--radius-md);
    overflow: visible;
  }

  .hero-welcome-cat {
    top: -10px;
    left: -10px;
    width: 38px;
  }

  .hero-title {
    font-size: 1.3rem;
    line-height: 1.3;
    margin-bottom: 0.4rem;
  }

  .hero-desc {
    font-size: 0.8rem;
    line-height: 1.45;
    margin-bottom: 1rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    gap: 0.5rem;
  }

  .btn-primary-glow,
  .btn-outline-white {
    width: 100%;
    justify-content: center;
    padding: 0.65rem 0.9rem;
    font-size: 0.85rem;
  }

  /* 6. Metrics Grid on Mobile */
  .metrics-row {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 0.5rem !important;
    margin-top: 0.75rem !important;
  }

  .metric-card {
    padding: 0.75rem 0.6rem;
  }

  .metric-val {
    font-size: 1.15rem;
  }

  .metric-label {
    font-size: 0.68rem;
  }

  /* 7. Ma trận 4 khối kiến thức & Lịch Streak on Mobile */
  .knowledge-matrix-grid {
    grid-template-columns: 1fr !important;
    gap: 0.75rem !important;
  }

  .streak-card {
    padding: 1rem 0.85rem;
    border-radius: var(--radius-md);
  }

  .streak-evo-stage {
    padding: 0.85rem 0.6rem;
  }

  .streak-evo-glyph svg {
    width: 90px !important;
    height: 90px !important;
  }

  .streak-big-number {
    font-size: 2.5rem;
  }

  .streak-days-row {
    gap: 0.25rem;
    justify-content: space-between;
  }

  .day-bubble {
    flex: 1;
    min-width: 0;
  }

  .day-bubble-circle {
    width: 32px;
    height: 32px;
    font-size: 0.78rem;
  }

  .day-name {
    font-size: 0.65rem;
  }

  .btn-checkin-streak {
    padding: 0.85rem;
    font-size: 0.95rem;
  }

  .streak-sim-box {
    padding: 0.75rem;
  }

  .streak-sim-row {
    flex-direction: column;
    gap: 0.4rem;
  }

  .btn-sim {
    width: 100%;
    justify-content: center;
  }

  /* 8. Lộ Trình Học (Roadmap Tab) on Mobile */
  .roadmap-header-card {
    flex-direction: column;
    align-items: flex-start;
    padding: 1.25rem 1rem;
    gap: 1rem;
  }

  .roadmap-stats-badges {
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
  }

  .stat-chip {
    min-width: unset;
    width: 100%;
    padding: 0.5rem 0.75rem;
  }

  .stat-chip-num {
    font-size: 1.15rem;
  }

  .station-node-card {
    padding: 0.85rem 0.95rem;
    gap: 0.75rem;
    border-radius: var(--radius-md);
  }

  .node-badge-icon {
    width: 44px;
    height: 44px;
    font-size: 1.15rem;
  }

  .node-left-col {
    gap: 0.75rem;
  }

  .chain-link-connector {
    height: 48px;
  }

  .theory-modal-container {
    height: 100% !important;
    max-height: 100% !important;
    border-radius: var(--radius-md);
  }

  .theory-modal-sidebar {
    width: 100% !important;
    min-width: 100% !important;
    max-width: 100% !important;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }

  .theory-main-content {
    padding: 1rem 0.85rem;
    gap: 1.25rem;
  }

  /* 9. Tab Đề Thi AI (AiExamTab) on Mobile */
  .ai-banner-card {
    flex-direction: column-reverse;
    padding: 1.2rem 1rem;
    gap: 0.75rem;
  }

  .ai-banner-card > div:last-child {
    display: none;
  }

  .ai-generator-grid {
    grid-template-columns: 1fr !important;
    gap: 1rem !important;
  }

  .selection-grid,
  .selection-grid-3 {
    grid-template-columns: 1fr !important;
    gap: 0.5rem;
  }

  .ai-direction-control {
    align-items: stretch;
    flex-direction: column;
  }

  .ai-direction-switch {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .ai-direction-switch button {
    padding-inline: 0.4rem;
    font-size: 0.74rem;
  }

  .ai-home-metrics {
    grid-template-columns: 1fr;
  }

  .ai-home-metric + .ai-home-metric {
    border-left: 0;
    border-top: 1px solid var(--color-border);
  }

  .exam-scale-btn-group {
    flex-direction: column;
    width: 100%;
    gap: 0.4rem;
  }

  .exam-scale-btn-group button {
    width: 100%;
    padding: 0.65rem;
  }

  /* 10. Kho Đề Thi (ExamRepoTab) on Mobile */
  .doc-header {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }

  /* 2 loại tài liệu xếp dọc trên màn hình hẹp */
  .doc-type-grid {
    grid-template-columns: 1fr;
    gap: 0.65rem;
  }

  .doc-type-card-inner {
    padding: 0.85rem 0.95rem;
    gap: 0.7rem;
  }

  .doc-active-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .doc-active-bar .doc-btn-add {
    justify-content: center;
  }

  .doc-header-actions {
    width: 100%;
  }

  .doc-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.85rem 0.95rem;
  }

  .doc-actions {
    width: 100%;
    justify-content: flex-end;
    border-top: 1px solid var(--color-border-subtle);
    padding-top: 0.5rem;
  }

  .exams-grid {
    grid-template-columns: 1fr !important;
  }

  .exam-taker-modal-backdrop {
    padding: 0 !important;
  }

  .exam-taker-window {
    height: 100dvh !important;
    max-height: 100dvh !important;
    border-radius: 0 !important;
    border: none !important;
  }

  .exam-taker-body {
    padding: 0.75rem 0.85rem;
  }

  .exam-taker-header {
    padding: 0.75rem 1rem;
  }

  .modal-backdrop {
    padding: 0.4rem;
  }

  .google-auth-card {
    padding: 1.5rem 1.25rem;
  }

  /* 11. Chuẩn hóa Input trên Mobile chống Auto-Zoom iOS */
  input[type="text"],
  input[type="search"],
  input[type="email"],
  input[type="password"],
  textarea,
  select {
    font-size: 16px !important;
  }
}

/* Extra small devices (<= 380px) */
@media (max-width: 380px) {
  .top-nav-row {
    padding: 0.35rem 0.45rem;
    gap: 0.35rem;
  }

  .brand-title {
    font-size: 0.95rem;
  }

  .day-bubble-circle {
    width: 28px;
    height: 28px;
    font-size: 0.72rem;
  }

  .day-name {
    font-size: 0.6rem;
  }

  .metrics-row {
    grid-template-columns: 1fr 1fr;
  }

  .nav-tab-btn {
    padding: 0.4rem 0.5rem;
    font-size: 0.74rem;
  }
}

/* ============================================================
   MOTION SYSTEM: FOCUS-VISIBLE & ACCESSIBILITY
   ============================================================ */
.btn-primary-glow:focus-visible,
.btn-outline-white:focus-visible,
.btn-checkin-streak:focus-visible,
.nav-tab-btn:focus-visible,
.day-bubble:focus-visible,
.btn-sim:focus-visible,
.streak-pill:focus-visible,
.brand-section:focus-visible {
  outline: 2px solid var(--color-primary) !important;
  outline-offset: 3px !important;
}

/* ============================================================
   HOME: CHIỀU SÂU CHO CÁC KHỐI NỀN TRẮNG PHÍA DƯỚI BANNER
   Chỉ animate transform / opacity; hover chỉ bật trên chuột thật.
   ============================================================ */

/* --- Thẻ chỉ số nhanh: nhuộm theo màu nhấn riêng của từng thẻ --- */
.metric-card {
  --metric-accent: var(--color-primary);
  background: var(--color-surface);
  background:
    radial-gradient(120% 90% at 100% 0%, color-mix(in srgb, var(--metric-accent) 12%, transparent) 0%, transparent 60%),
    linear-gradient(180deg, #FFFFFF 0%, color-mix(in srgb, var(--metric-accent) 4%, #FFFFFF) 100%);
  border-color: color-mix(in srgb, var(--metric-accent) 18%, #FFEDD5);
}

/* Vạch nhấn trên đỉnh thẻ: nghỉ ở 28% chiều ngang, bung hết khi rê chuột */
.metric-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 1rem;
  right: 1rem;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: var(--metric-accent);
  transform: scaleX(0.28);
  transform-origin: left center;
  opacity: 0.85;
  transition: transform 320ms var(--ease-out);
  pointer-events: none;
}

.metric-icon-wrap {
  box-shadow:
    0 0 0 5px color-mix(in srgb, var(--metric-accent) 10%, transparent),
    inset 0 1px 0 rgba(255, 255, 255, 0.7);
}

.metric-val {
  font-variant-numeric: tabular-nums;
}

@media (hover: hover) and (pointer: fine) {
  .metric-card:hover::before {
    transform: scaleX(1);
  }
}

/* --- Khung ma trận kiến thức --- */
.matrix-panel {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: 1.5rem;
  background: linear-gradient(180deg, #FFFFFF 0%, #FFF8EE 100%);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

/* Lưới chấm mờ dần xuống dưới, tạo chất liệu cho nền */
.matrix-panel::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image: radial-gradient(rgba(234, 88, 12, 0.16) 1px, transparent 1.3px);
  background-size: 18px 18px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9) 0%, transparent 65%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9) 0%, transparent 65%);
  pointer-events: none;
}

/* Quầng sáng cam trôi rất chậm ở góc phải */
.matrix-panel::after {
  content: '';
  position: absolute;
  top: -100px;
  right: -70px;
  z-index: -1;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(251, 191, 36, 0.3) 0%, rgba(234, 88, 12, 0.12) 45%, transparent 70%);
  animation: panelOrbDrift 14s ease-in-out infinite alternate;
  will-change: transform;
  pointer-events: none;
}

@keyframes panelOrbDrift {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to   { transform: translate3d(-36px, 28px, 0) scale(1.12); }
}

.panel-title-icon {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background: var(--color-cream);
  box-shadow: inset 0 0 0 1px rgba(234, 88, 12, 0.22), 0 2px 6px rgba(234, 88, 12, 0.12);
}

.mastery-title-wrap {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}

.mastery-help-anchor {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.mastery-help-trigger {
  display: inline-grid;
  place-items: center;
  width: 22px;
  height: 22px;
  padding: 0;
  border: 1px solid #CBD5E1;
  border-radius: 50%;
  background: #FFFFFF;
  color: #64748B;
  cursor: pointer;
  transition: color 150ms ease, border-color 150ms ease, transform 150ms ease;
}

.mastery-help-trigger:hover,
.mastery-help-trigger:focus-visible {
  color: #C2410C;
  border-color: #FB923C;
}

.mastery-help-trigger:active {
  transform: scale(0.96);
}

.mastery-help-popover {
  position: absolute;
  z-index: 20;
  top: calc(100% + 10px);
  left: 50%;
  width: min(340px, calc(100vw - 48px));
  padding: 0.8rem 0.9rem;
  border: 1px solid #FED7AA;
  border-radius: 8px;
  background: #FFFFFF;
  color: #334155;
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.16);
  font-size: 0.78rem;
  font-weight: 500;
  line-height: 1.55;
  white-space: normal;
  transform: translateX(-50%);
}

/* Chip trạng thái đồng bộ: chấm xanh có vòng sóng lan ra */
.live-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.28rem 0.7rem;
  border-radius: 999px;
  font-size: 0.74rem;
  font-weight: 700;
  color: #047857;
  background: #ECFDF5;
  border: 1px solid #A7F3D0;
}

.live-dot {
  position: relative;
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10B981;
}

.live-dot::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: #10B981;
  animation: liveDotPing 2s var(--ease-out) infinite;
}

@keyframes liveDotPing {
  0%   { transform: scale(1);   opacity: 0.55; }
  80%, 100% { transform: scale(2.8); opacity: 0; }
}

/* --- 4 thẻ khối kiến thức --- */
.matrix-card {
  --card-accent: var(--color-primary);
  padding: 1rem;
  border-radius: var(--radius-md);
  border: 1px solid color-mix(in srgb, var(--card-accent) 20%, #FFEDD5);
  background: #FFFDF9;
  background:
    radial-gradient(130% 100% at 0% 0%, color-mix(in srgb, var(--card-accent) 11%, transparent) 0%, transparent 58%),
    linear-gradient(180deg, #FFFFFF 0%, color-mix(in srgb, var(--card-accent) 4%, #FFFDF9) 100%);
  box-shadow: 0 1px 2px rgba(124, 45, 18, 0.05);
}

.matrix-icon {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--card-accent);
  background: color-mix(in srgb, var(--card-accent) 13%, #FFFFFF);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--card-accent) 24%, transparent);
  transition: transform 240ms var(--ease-out);
}

@media (hover: hover) and (pointer: fine) {
  .matrix-card:hover .matrix-icon {
    transform: translateY(-1px) rotate(-6deg) scale(1.06);
  }
}

/* Thanh tiến độ: nền ray nhuộm theo màu thẻ + vệt sáng quét qua định kỳ */
.matrix-card .progress-bar-shell {
  background: color-mix(in srgb, var(--card-accent) 14%, #F3E8DC);
}

.matrix-card .progress-bar-fill {
  position: relative;
}

.matrix-card .progress-bar-fill::after {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 38%;
  background: linear-gradient(100deg, transparent 0%, rgba(255, 255, 255, 0.55) 50%, transparent 100%);
  transform: translateX(-120%);
  animation: barShimmer 3.8s var(--ease-out) infinite;
  pointer-events: none;
}

.matrix-card:nth-child(2) .progress-bar-fill::after { animation-delay: 0.5s; }
.matrix-card:nth-child(3) .progress-bar-fill::after { animation-delay: 1s; }
.matrix-card:nth-child(4) .progress-bar-fill::after { animation-delay: 1.5s; }

@keyframes barShimmer {
  0%   { transform: translateX(-120%); }
  55%, 100% { transform: translateX(300%); }
}

/* Nút -5% / +5%: viên thuốc nhỏ, nhấn co 0.97, vùng bấm mở rộng */
.btn-mastery-step {
  position: relative;
  padding: 3px 10px;
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--color-text-muted);
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  cursor: pointer;
  transition:
    transform 140ms var(--ease-out),
    background-color 160ms ease,
    border-color 160ms ease,
    color 160ms ease;
}

.btn-mastery-step::before {
  content: '';
  position: absolute;
  inset: -6px;
}

.btn-mastery-step.is-up {
  color: var(--card-accent);
  font-weight: 800;
  border-color: color-mix(in srgb, var(--card-accent) 38%, #FED7AA);
}

@media (hover: hover) and (pointer: fine) {
  .btn-mastery-step:hover {
    background: color-mix(in srgb, var(--card-accent) 10%, #FFFFFF);
    border-color: var(--card-accent);
  }
}

.btn-mastery-step:active {
  transform: scale(0.97);
}

.btn-mastery-step:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* --- Thẻ streak bên phải: lưới chấm + quầng sáng + nút điểm danh có vệt sáng --- */
.streak-card {
  isolation: isolate;
  background:
    radial-gradient(rgba(234, 88, 12, 0.09) 1px, transparent 1.3px) 0 0 / 18px 18px,
    linear-gradient(180deg, #FFFFFF 0%, #FFF9F2 100%);
}

.streak-card::after {
  content: '';
  position: absolute;
  top: -80px;
  right: -80px;
  z-index: -1;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(251, 191, 36, 0.28) 0%, rgba(234, 88, 12, 0.1) 48%, transparent 70%);
  animation: panelOrbDrift 16s ease-in-out infinite alternate;
  will-change: transform;
  pointer-events: none;
}

.day-bubble-circle {
  transition:
    background-color 180ms ease,
    border-color 180ms ease,
    color 180ms ease,
    transform 180ms var(--ease-out);
}

.day-bubble.checked .day-bubble-circle {
  background: linear-gradient(145deg, #F97316 0%, var(--color-primary) 100%);
}

@media (hover: hover) and (pointer: fine) {
  .day-bubble:hover .day-bubble-circle {
    transform: translateY(-2px) scale(1.06);
  }
}

.btn-checkin-streak {
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

.btn-checkin-streak:not(:disabled)::after {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: -1;
  width: 45%;
  background: linear-gradient(100deg, transparent 0%, rgba(255, 255, 255, 0.3) 50%, transparent 100%);
  transform: translateX(-130%) skewX(-20deg);
  animation: checkinSheen 3.6s var(--ease-out) infinite;
  pointer-events: none;
}

@keyframes checkinSheen {
  0%   { transform: translateX(-130%) skewX(-20deg); }
  45%, 100% { transform: translateX(330%) skewX(-20deg); }
}

@media (prefers-reduced-motion: reduce) {
  .matrix-panel::after,
  .streak-card::after,
  .live-dot::after,
  .matrix-card .progress-bar-fill::after,
  .btn-checkin-streak::after {
    animation: none !important;
  }

  .live-dot::after {
    opacity: 0;
  }
}

/* Tôn trọng người dùng bật tính năng giảm chuyển động trong hệ điều hành */
.study-mode-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.42rem 0.8rem;
  border-radius: 8px;
  color: #fff;
  font-size: 0.78rem;
  font-weight: 800;
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.16);
  white-space: nowrap;
}

.theory-quiz-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 1.25rem;
  border: 1px solid color-mix(in srgb, var(--color-primary) 28%, #fed7aa);
  border-radius: 16px;
  background:
    radial-gradient(circle at 92% 20%, rgba(251, 146, 60, 0.18), transparent 32%),
    linear-gradient(135deg, #fff7ed, #ffffff 72%);
  box-shadow: 0 10px 26px rgba(234, 88, 12, 0.1);
}

.theory-quiz-cta > div {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.theory-quiz-cta strong {
  color: var(--color-deep);
  font-size: 0.98rem;
}

.theory-quiz-cta span {
  color: #7c2d12;
  font-size: 0.82rem;
  line-height: 1.45;
}

.theory-quiz-cta-button {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  flex-shrink: 0;
  padding: 0.7rem 1rem;
  border: 0;
  border-radius: 10px;
  background: linear-gradient(135deg, #ea580c, #c2410c);
  color: #fff;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 7px 18px rgba(234, 88, 12, 0.28);
  transition: transform 160ms var(--ease-out), box-shadow 160ms ease;
}

.theory-quiz-cta-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 22px rgba(234, 88, 12, 0.34);
}

.theory-quiz-cta-button:active {
  transform: scale(0.97);
}

.pdf-reading-stage {
  display: grid;
  grid-template-columns: minmax(150px, 18%) minmax(0, 1fr) minmax(150px, 18%);
  gap: 0;
  flex: 1;
  min-height: 0;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 20%, rgba(59, 130, 246, 0.14), transparent 42%),
    #090f1d;
}

.pdf-reading-rail {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.6rem;
  padding: 2rem 1.25rem;
  color: #cbd5e1;
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.9), rgba(15, 23, 42, 0.58));
}

.pdf-reading-rail-left {
  border-right: 1px solid rgba(148, 163, 184, 0.14);
}

.pdf-reading-rail-right {
  border-left: 1px solid rgba(148, 163, 184, 0.14);
}

.pdf-reading-rail svg {
  color: #fb923c;
  filter: drop-shadow(0 0 9px rgba(251, 146, 60, 0.42));
}

.pdf-reading-rail-right svg {
  color: #4ade80;
  filter: drop-shadow(0 0 9px rgba(74, 222, 128, 0.42));
}

.pdf-rail-kicker {
  color: #94a3b8;
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.13em;
}

.pdf-reading-rail strong {
  color: #f8fafc;
  font-size: 1.1rem;
}

.pdf-reading-rail span {
  color: #cbd5e1;
  font-size: 0.8rem;
  line-height: 1.45;
}

.pdf-reading-rail small {
  color: #94a3b8;
  font-size: 0.72rem;
  line-height: 1.55;
}

.pdf-rail-line {
  width: 100%;
  height: 1px;
  margin: 0.7rem 0;
  background: linear-gradient(90deg, rgba(251, 146, 60, 0.65), transparent);
}

.pdf-rail-progress {
  width: 100%;
  height: 7px;
  margin: 0.35rem 0 0.5rem;
  overflow: hidden;
  border-radius: 999px;
  background: #1e293b;
}

.pdf-rail-progress span {
  display: block;
  width: 80%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #22c55e, #86efac);
  box-shadow: 0 0 12px rgba(74, 222, 128, 0.42);
}

.pdf-iframe-shell {
  min-width: 0;
  min-height: 0;
  padding: 0 1.2rem;
  background: rgba(2, 6, 23, 0.42);
}

.pdf-iframe-shell iframe {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 500px;
  border: 0;
  background: #525659;
  box-shadow: 0 0 30px rgba(0, 0, 0, 0.32);
}

.pdf-reading-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-shrink: 0;
  padding: 0.8rem 1.2rem;
  border-top: 1px solid rgba(148, 163, 184, 0.2);
  background: rgba(15, 23, 42, 0.98);
  color: #e2e8f0;
}

.pdf-reading-actions > div {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.pdf-reading-actions strong {
  color: #f8fafc;
  font-size: 0.86rem;
}

.pdf-reading-actions span {
  color: #94a3b8;
  font-size: 0.74rem;
}

@media (max-width: 820px) {
  .pdf-reading-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .pdf-reading-actions .theory-quiz-cta-button {
    justify-content: center;
  }
}

@media (max-width: 820px) {
  .theory-quiz-cta {
    align-items: stretch;
    flex-direction: column;
  }

  .theory-quiz-cta-button {
    justify-content: center;
  }

  .pdf-reading-stage {
    display: block;
    overflow-y: auto;
  }

  .pdf-reading-rail {
    display: none;
  }

  .pdf-iframe-shell {
    height: 100%;
    min-height: 500px;
    padding: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.15s !important;
    scroll-behavior: auto !important;
  }

  .hero-gradient-layer,
  .btn-primary-glow::after,
  .day-bubble.today .day-bubble-circle,
  .botpress-mascot-img,
  .botpress-mascot-btn,
  .streak-flame-giant,
  .streak-sim-box {
    animation: none !important;
  }
}

/* ============================================================
   ROADMAP POLISH — Learning constellation
   Glow/gradient is reserved for progress and active interactions.
   ============================================================ */
.roadmap-container {
  --roadmap-accent: var(--color-primary, #ea580c);
  --roadmap-accent-soft: color-mix(in srgb, var(--roadmap-accent) 14%, #fff);
  --roadmap-ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  position: relative;
  isolation: isolate;
}

.roadmap-container::before,
.roadmap-container::after {
  content: '';
  position: absolute;
  z-index: -1;
  pointer-events: none;
  border-radius: 50%;
  filter: blur(42px);
  opacity: 0.24;
}

.roadmap-container::before {
  width: 18rem;
  height: 18rem;
  top: 1rem;
  right: -4rem;
  background: radial-gradient(circle, color-mix(in srgb, var(--roadmap-accent) 30%, transparent), transparent 68%);
}

.roadmap-container::after {
  width: 15rem;
  height: 15rem;
  top: 28rem;
  left: -5rem;
  background: radial-gradient(circle, rgba(14, 165, 233, 0.2), transparent 68%);
}

.roadmap-header-card {
  position: relative;
  overflow: hidden;
  border-color: color-mix(in srgb, var(--roadmap-accent) 22%, var(--color-border));
  background:
    radial-gradient(circle at 92% 15%, color-mix(in srgb, var(--roadmap-accent) 19%, transparent), transparent 30%),
    linear-gradient(135deg, color-mix(in srgb, var(--roadmap-accent) 7%, #fff), #fff 70%);
  box-shadow: 0 14px 38px color-mix(in srgb, var(--roadmap-accent) 12%, transparent);
}

.roadmap-header-card::after {
  content: '';
  position: absolute;
  width: 11rem;
  height: 11rem;
  right: 12%;
  bottom: -8rem;
  border: 1px solid color-mix(in srgb, var(--roadmap-accent) 22%, transparent);
  border-radius: 50%;
  box-shadow: 0 0 0 1.5rem color-mix(in srgb, var(--roadmap-accent) 7%, transparent), 0 0 0 3rem color-mix(in srgb, var(--roadmap-accent) 4%, transparent);
  pointer-events: none;
}

.roadmap-header-text h2 {
  letter-spacing: -0.025em;
}

.stat-chip {
  transition: transform 180ms var(--roadmap-ease-out), border-color 180ms ease, box-shadow 180ms ease;
}

@media (hover: hover) and (pointer: fine) {
  .stat-chip:hover {
    transform: translateY(-2px);
    border-color: color-mix(in srgb, var(--roadmap-accent) 42%, var(--color-border));
    box-shadow: 0 8px 20px color-mix(in srgb, var(--roadmap-accent) 12%, transparent);
  }
}

.track-switch-btn,
.blueprint-card,
.station-node-card,
.btn-open-station,
.btn-quiz-station,
.btn-stream-pdf,
.theory-toolbar-btn {
  transition:
    transform 180ms var(--roadmap-ease-out),
    opacity 160ms ease,
    background-color 180ms ease,
    border-color 180ms ease,
    color 180ms ease,
    box-shadow 180ms ease;
}

.track-switch-btn:active,
.blueprint-header-toggle:active,
.station-node-card:active,
.btn-open-station:active,
.btn-quiz-station:active,
.btn-stream-pdf:active,
.theory-toolbar-btn:active {
  transform: scale(0.975);
}

.track-switch-btn:focus-visible,
.station-node-card:focus-visible,
.btn-open-station:focus-visible,
.btn-quiz-station:focus-visible,
.btn-stream-pdf:focus-visible,
.theory-toolbar-btn:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--roadmap-accent) 34%, transparent);
  outline-offset: 3px;
}

.track-switch-btn {
  background: color-mix(in srgb, var(--roadmap-accent) 3%, #f8fafc);
}

.track-switch-btn.active-cs,
.track-switch-btn.active-ict {
  position: relative;
  box-shadow: 0 10px 26px color-mix(in srgb, var(--roadmap-accent) 15%, transparent);
}

.track-switch-btn.active-cs::before,
.track-switch-btn.active-ict::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(115deg, transparent 24%, rgba(255,255,255,0.48) 50%, transparent 76%);
  transform: translateX(-120%);
  animation: roadmapSheen 4.8s var(--roadmap-ease-out) infinite;
  pointer-events: none;
}

.track-icon-wrapper {
  transition: transform 180ms var(--roadmap-ease-out), box-shadow 180ms ease;
}

@media (hover: hover) and (pointer: fine) {
  .track-switch-btn:hover .track-icon-wrapper {
    transform: rotate(-4deg) scale(1.06);
  }

  .blueprint-card:hover {
    border-color: color-mix(in srgb, var(--roadmap-accent) 30%, var(--color-border));
    box-shadow: 0 10px 24px color-mix(in srgb, var(--roadmap-accent) 9%, transparent);
  }
}

.station-node-card {
  border-color: color-mix(in srgb, var(--roadmap-accent) 12%, var(--color-border));
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
}

.station-node-card:hover {
  box-shadow: 0 14px 30px color-mix(in srgb, var(--roadmap-accent) 14%, rgba(15, 23, 42, 0.08));
}

.station-node-card.in-progress {
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--roadmap-accent) 18%, transparent), 0 12px 30px color-mix(in srgb, var(--roadmap-accent) 18%, transparent);
}

.station-node-card.completed {
  border-color: rgba(34, 197, 94, 0.42);
  box-shadow: 0 8px 24px rgba(34, 197, 94, 0.09);
}

.node-badge-icon {
  transition: transform 180ms var(--roadmap-ease-out), box-shadow 180ms ease;
}

@media (hover: hover) and (pointer: fine) {
  .station-node-card:hover .node-badge-icon {
    transform: translateY(-2px) rotate(-3deg);
  }
}

.progress-bar-shell {
  position: relative;
  height: 9px;
  background: color-mix(in srgb, var(--roadmap-accent) 12%, #e5e7eb);
  box-shadow: inset 0 1px 2px rgba(15, 23, 42, 0.08);
}

.progress-bar-fill {
  position: relative;
  overflow: hidden;
  box-shadow: 0 0 10px color-mix(in srgb, var(--roadmap-accent) 35%, transparent);
}

.progress-bar-fill::after {
  content: '';
  position: absolute;
  inset: 0 auto 0 -40%;
  width: 34%;
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, 0.66), transparent);
  transform: translateX(-100%);
  animation: roadmapProgressSheen 3.6s var(--roadmap-ease-out) infinite;
}

.chain-link-connector {
  transition: transform 180ms var(--roadmap-ease-out), filter 180ms ease;
}

.chain-link-connector:active {
  transform: scale(0.94);
}

@keyframes roadmapSheen {
  0%, 58% { transform: translateX(-120%); }
  78%, 100% { transform: translateX(320%); }
}

@keyframes roadmapProgressSheen {
  0%, 45% { transform: translateX(-100%); }
  72%, 100% { transform: translateX(360%); }
}

@media (prefers-reduced-motion: reduce) {
  .roadmap-container::before,
  .roadmap-container::after,
  .track-switch-btn.active-cs::before,
  .track-switch-btn.active-ict::before,
  .progress-bar-fill::after,
  .station-node-card.in-progress .node-badge-icon {
    animation: none !important;
  }

  .track-switch-btn,
  .blueprint-card,
  .station-node-card,
  .btn-open-station,
  .btn-quiz-station,
  .btn-stream-pdf,
  .theory-toolbar-btn,
  .node-badge-icon,
  .chain-link-connector {
    transition-duration: 0.01ms !important;
  }
}


/* ============================================================
   LOADING SCREEN — Animations cho @ThanhNhi gif + spinner
   ============================================================ */

@keyframes loading-credit-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(234,88,12, 0.65); }
  50%      { box-shadow: 0 0 0 6px rgba(234,88,12, 0); }
}

@keyframes loading-dot-bounce {
  0%, 80%, 100% {
    transform: translateY(0) scale(0.85);
    opacity: 0.4;
  }
  40% {
    transform: translateY(-6px) scale(1.05);
    opacity: 1;
  }
}

@keyframes loading-bar-slide {
  0% {
    left: -45%;
  }
  100% {
    left: 100%;
  }
}

/* Dấu 3 chấm nhịp ngay sau text "Đang tải..." */
.loading-dots-anim::after {
  content: '';
  display: inline-block;
  width: 1.2em;
  text-align: left;
  animation: loading-dots-cycle 1.2s infinite steps(4, end);
}

@keyframes loading-dots-cycle {
  0%   { content: ''; }
  25%  { content: '.'; }
  50%  { content: '..'; }
  75%  { content: '...'; }
  100% { content: ''; }
}

/* Vì pseudo-element không support content động trên mọi browser,
   fallback dùng span dots đơn giản — class loading-dots-anim chỉ là hint. */
/* ============================================================
   Hộp thông báo của Admin - phong cách iOS
   Kính mờ tông ấm, gradient nhẹ, bo góc lớn, không có thanh viền màu.
   Màu theo loại chỉ đổi sắc độ nền và biểu tượng.
   ============================================================ */

/* Đường cong dùng chung cho mọi chuyển động của hộp thông báo */
.ann-stack,
.ann-overlay {
  --ann-ease-out: cubic-bezier(0.23, 1, 0.32, 1);
}

.ann-stack {
  position: fixed;
  left: 1.25rem;
  bottom: 1.25rem;
  z-index: 1900;
  display: flex;
  flex-direction: column-reverse;
  gap: 0.7rem;
  width: min(380px, calc(100vw - 2.5rem));
  pointer-events: none;
}

.ann-card {
  /* Mặc định: Thông tin (cam đào) */
  --a: #EA580C;
  --a-ink: #C2410C;
  --t1: #FFF1DE;
  --t2: #FFCFA3;
  position: relative;
  overflow: hidden;
  pointer-events: auto;
  padding: 0.9rem 0.95rem 0.75rem;
  color: #271C19;
  /* Lớp bóng kính phía trên + gradient nền nhẹ */
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.5) 0%, rgba(255, 255, 255, 0) 55%),
    linear-gradient(155deg, var(--t1) 0%, var(--t2) 100%);
  border: 1px solid rgba(255, 255, 255, 0.75);
  border-radius: 22px;
  box-shadow:
    0 18px 38px -14px rgba(124, 45, 18, 0.4),
    0 2px 8px rgba(124, 45, 18, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(22px) saturate(1.5);
  -webkit-backdrop-filter: blur(22px) saturate(1.5);
  animation: annSlideIn 320ms var(--ann-ease-out) calc(var(--i, 0) * 60ms) backwards;
  /* Dùng cho lúc thoát (.ann-leaving): transition nên có thể bị ngắt giữa chừng mà không giật */
  transition:
    opacity 200ms var(--ann-ease-out),
    transform 200ms var(--ann-ease-out);
}

.ann-info      { --a: #EA580C; --a-ink: #C2410C; --t1: #FFF1DE; --t2: #FFCFA3; }
.ann-success   { --a: #16A34A; --a-ink: #15803D; --t1: #F1FBEA; --t2: #BFEACB; }
.ann-important { --a: #DC2626; --a-ink: #B91C1C; --t1: #FFF0EA; --t2: #FFC4B9; }
.ann-event     { --a: #D97706; --a-ink: #92400E; --t1: #FFF7DC; --t2: #FCDB8E; }

/* Thoát theo đúng đường đã vào: hạ xuống và mờ dần */
.ann-card.ann-leaving {
  opacity: 0;
  transform: translateY(12px) scale(0.97);
  pointer-events: none;
}

.ann-head {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
}

/* Biểu tượng dạng squircle của iOS: gradient nhẹ từ màu nhấn */
.ann-icon {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  color: #FFFFFF;
  background: linear-gradient(160deg, color-mix(in srgb, var(--a) 72%, #FFFFFF) 0%, var(--a) 100%);
  border-radius: 11px;
  box-shadow:
    0 4px 10px -3px color-mix(in srgb, var(--a) 60%, transparent),
    inset 0 1px 0 rgba(255, 255, 255, 0.45);
}

.ann-title {
  flex: 1;
  min-width: 0;
  margin: 0;
  padding-top: 0.45rem;
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: #3B1708;
  overflow-wrap: anywhere;
}

/* Nút đóng tròn kiểu iOS */
.ann-close {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  padding: 0;
  color: rgba(59, 23, 8, 0.62);
  background: rgba(59, 23, 8, 0.08);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  transition:
    background-color 150ms ease,
    color 150ms ease,
    transform 160ms var(--ann-ease-out);
}

.ann-close:hover {
  color: #3B1708;
  background: rgba(59, 23, 8, 0.16);
}

.ann-close:active {
  transform: scale(0.92);
}

.ann-message {
  margin: 0.5rem 0 0 calc(36px + 0.7rem);
  font-size: 0.86rem;
  line-height: 1.5;
  color: #4A2A1B;
  white-space: pre-line;
  overflow-wrap: anywhere;
  max-height: 7.5rem;
  overflow-y: auto;
}

.ann-foot {
  margin: 0.65rem 0 0 calc(36px + 0.7rem);
  padding-top: 0.55rem;
  border-top: 1px solid rgba(124, 45, 18, 0.12);
}

/* Checkbox tròn kiểu iOS. Input thật chỉ thu nhỏ (không display:none) để bàn phím vẫn dùng được */
.ann-check-input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  margin: 0;
}

.ann-check-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 28px;
  font-size: 0.78rem;
  font-weight: 600;
  color: #6B4A38;
  cursor: pointer;
  user-select: none;
  transition: color 0.18s ease;
}

.ann-check-label:hover {
  color: #3B1708;
}

.ann-check-box {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1.5px solid rgba(124, 45, 18, 0.35);
  background: rgba(255, 255, 255, 0.55);
  color: transparent;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.ann-check-input:checked + .ann-check-label .ann-check-box {
  background: var(--a);
  border-color: var(--a);
  color: #FFFFFF;
}

/* Đang khoá (thông báo QUAN TRỌNG chờ vài giây) */
.ann-check-input:disabled + .ann-check-label {
  cursor: not-allowed;
  color: rgba(107, 74, 56, 0.6);
}

.ann-check-input:disabled + .ann-check-label .ann-check-box {
  opacity: 0.5;
  border-style: dashed;
}

.ann-lock-count {
  min-width: 2.1em;
  padding: 0.05rem 0.4rem;
  font-size: 0.72rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  text-align: center;
  color: var(--a-ink);
  background: rgba(255, 255, 255, 0.6);
  border-radius: 999px;
}

.ann-check-input:focus-visible + .ann-check-label .ann-check-box,
.ann-close:focus-visible,
.ann-ok:focus-visible {
  outline: 2px solid var(--a-ink);
  outline-offset: 2px;
}

@keyframes annSlideIn {
  from { opacity: 0; transform: translateY(12px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

@media (max-width: 640px) {
  .ann-stack {
    left: 0.75rem;
    bottom: 0.75rem;
    width: calc(100vw - 1.5rem);
  }
}

/* ============================================================
   THÔNG BÁO QUAN TRỌNG: hiện giữa màn hình, làm mờ nền
   ============================================================ */

.ann-overlay {
  position: fixed;
  inset: 0;
  /* Phải cao hơn chat Botpress (bong bóng 9999, khung chat 10000, mobile 99999) */
  z-index: 100000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
  background: rgba(40, 16, 6, 0.38);
  backdrop-filter: blur(8px) saturate(1.1);
  -webkit-backdrop-filter: blur(8px) saturate(1.1);
  animation: annFadeIn 250ms var(--ann-ease-out) backwards;
  transition: opacity 200ms var(--ann-ease-out);
}

.ann-overlay-leaving {
  opacity: 0;
}

.ann-card-modal {
  width: min(420px, 100%);
  max-height: calc(100dvh - 2.5rem);
  overflow-y: auto;
  padding: 1.5rem 1.4rem 1.1rem;
  text-align: center;
  border-radius: 30px;
  box-shadow:
    0 40px 80px -20px rgba(60, 20, 6, 0.55),
    0 4px 14px rgba(124, 45, 18, 0.14),
    inset 0 1px 0 rgba(255, 255, 255, 0.95);
  /* Modal không gắn với trigger nên giữ origin ở giữa */
  transform-origin: center;
  animation: annPopIn 300ms var(--ann-ease-out) 40ms backwards;
  outline: none;
}

.ann-card-modal.ann-leaving {
  opacity: 0;
  transform: scale(0.96);
}

/* Biểu tượng bật nhẹ ngay sau khi thẻ hiện, chỉ chạy một lần */
.ann-card-modal .ann-icon {
  animation: annIconIn 320ms var(--ann-ease-out) 140ms backwards;
}

/* Bản giữa màn hình xếp dọc, căn giữa như alert của iOS */
.ann-card-modal .ann-head {
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  position: relative;
}

.ann-card-modal .ann-icon {
  width: 56px;
  height: 56px;
  border-radius: 17px;
}

.ann-card-modal .ann-title {
  padding: 0 1.5rem;
  font-size: 1.2rem;
  line-height: 1.3;
}

.ann-card-modal .ann-close {
  position: absolute;
  top: -0.35rem;
  right: -0.25rem;
}

.ann-card-modal .ann-message {
  margin: 0.7rem 0 0;
  padding: 0 0.25rem;
  font-size: 0.96rem;
  line-height: 1.6;
  text-align: center;
  max-height: 40vh;
}

.ann-card-modal .ann-foot {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.7rem;
  margin: 1.1rem 0 0;
  padding-top: 0;
  border-top: none;
}

.ann-card-modal .ann-check-label {
  justify-content: center;
  order: 2;
}

/* Nhãn QUAN TRỌNG */
.ann-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-bottom: 0.9rem;
  padding: 0.22rem 0.65rem;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--a-ink);
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid color-mix(in srgb, var(--a) 28%, transparent);
  border-radius: 999px;
}

/* Nút chính kiểu iOS: bo tròn, full-width trong alert */
.ann-ok {
  order: 1;
  width: 100%;
  padding: 0.75rem 1.3rem;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 700;
  color: #FFFFFF;
  background: linear-gradient(180deg, color-mix(in srgb, var(--a) 80%, #FFFFFF) 0%, var(--a) 100%);
  border: none;
  border-radius: 14px;
  cursor: pointer;
  box-shadow:
    0 8px 16px -6px color-mix(in srgb, var(--a) 65%, transparent),
    inset 0 1px 0 rgba(255, 255, 255, 0.4);
  transition:
    transform 160ms var(--ann-ease-out),
    filter 150ms ease;
}

.ann-ok:hover {
  filter: brightness(1.05);
}

.ann-ok:active {
  transform: scale(0.97);
}

@keyframes annFadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes annPopIn {
  from { opacity: 0; transform: scale(0.95) translateY(8px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

@keyframes annIconIn {
  from { opacity: 0; transform: scale(0.8); }
  to   { opacity: 1; transform: scale(1); }
}

/* Giảm chuyển động: giữ hiệu ứng mờ dần, bỏ mọi dịch chuyển và phóng to */
@media (prefers-reduced-motion: reduce) {
  .ann-card {
    animation: annFadeIn 200ms ease backwards;
  }

  .ann-card-modal {
    animation: annFadeIn 200ms ease backwards;
  }

  .ann-card-modal .ann-icon {
    animation: none;
  }

  .ann-card.ann-leaving,
  .ann-card-modal.ann-leaving {
    transform: none;
  }

  .ann-close:active,
  .ann-ok:active {
    transform: none;
  }
}

/* Giảm độ trong suốt: dùng nền đặc thay cho kính mờ */
@media (prefers-reduced-transparency: reduce) {
  .ann-card {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    background: linear-gradient(155deg, var(--t1) 0%, var(--t2) 100%);
  }

  .ann-overlay {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    background: rgba(40, 16, 6, 0.72);
  }
}