/* ═══════════════════════════════════════════════════════════════
   SAT IntelliPrep — UI/UX Redesign System (Phase UI-0)
   Design Language: Calm Academic Intelligence (Education Reference Mood)
   Typography: Lora (Editorial Display) + Inter / Be Vietnam Pro (Sans UI)
   Geometry: 24–32px Large Rounded Surfaces | Restrained Soft Pastels
   ═══════════════════════════════════════════════════════════════ */

:root {
  /* ── Core Surfaces & Neutral Canvas ── */
  --color-canvas: #F6F8FC;
  --color-surface: #FFFFFF;
  --color-surface-raised: #FFFFFF;
  --color-surface-subtle: #EEF2F7;
  --color-surface-hover: #F8FAFC;
  
  --color-border: #DDE3EC;
  --color-border-subtle: #EBF0F7;
  --color-border-focus: #4E66E8;

  /* ── Typography Ink Hierarchy ── */
  --color-ink: #18212F;
  --color-ink-light: #243B53;
  --color-muted: #667085;
  --color-muted-light: #98A2B3;
  --color-muted-dark: #344054;

  /* ── Primary Brand (Indigo) ── */
  --color-primary: #4E66E8;
  --color-primary-hover: #4056CF;
  --color-primary-soft: #E9EDFF;
  --color-primary-dark: #3647B5;

  /* ── Academic Soft Pastel Accents (Section & Domain Identity) ── */
  --pastel-blue: #DDE8F8;
  --pastel-blue-border: #C8DBF4;
  --pastel-blue-dark: #234880;

  --pastel-green: #DDE9DF;
  --pastel-green-border: #C4D9C8;
  --pastel-green-dark: #1E5033;

  --pastel-sage: #CEDDBB;
  --pastel-sage-border: #B7CCA0;
  --pastel-sage-dark: #33501A;

  --pastel-yellow: #FFE0A0;
  --pastel-yellow-border: #F3CE7A;
  --pastel-yellow-dark: #7A5308;

  --pastel-coral: #F3A09E;
  --pastel-coral-border: #E88381;
  --pastel-coral-dark: #8C2422;

  --pastel-lilac: #E7E0F7;
  --pastel-lilac-border: #D0C3EA;
  --pastel-lilac-dark: #4B3182;

  /* ── Semantic System (WCAG AA High Contrast) ── */
  --color-success: #2D8A57;
  --color-success-soft: #ECF8F1;
  --color-warning: #B7791F;
  --color-warning-soft: #FEF7EC;
  --color-error: #C44949;
  --color-danger: #C44949;
  --color-error-soft: #FDF2F2;
  --color-danger-soft: #FDF2F2;
  --color-info: #4E66E8;
  --color-info-soft: #E9EDFF;

  /* ── Typography Pairing & Scales ── */
  --font-display: 'Lora', Georgia, 'Times New Roman', serif;
  --font-sans: 'Inter', 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: var(--font-display);

  --text-hero-display: 3.25rem; /* 52px */
  --text-display: 2.25rem;      /* 36px */
  --text-h1: 1.875rem;          /* 30px */
  --text-h2: 1.5rem;            /* 24px */
  --text-h3: 1.25rem;           /* 20px */
  --text-body-lg: 1.125rem;     /* 18px */
  --text-body: 1rem;            /* 16px */
  --text-passage: 1.125rem;     /* 18px */
  --text-ui: 0.875rem;          /* 14px */
  --text-meta: 0.8125rem;       /* 13px */
  --text-xs: 0.75rem;           /* 12px */
  --text-2xs: 0.6875rem;        /* 11px */

  /* ── Geometry & Radius Scale ── */
  --radius-hero: 30px;
  --radius-card-xl: 30px;
  --radius-card-lg: 24px;
  --radius-xl: 24px;
  --radius-card: 20px;
  --radius-card-sm: 16px;
  --radius-lg: 16px;
  --radius-control: 14px;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-pill: 999px;

  /* ── Subtle Elevation & Shadows (Calm, Non-SaaS, Elegant Glow) ── */
  --shadow-sm: 0 1px 3px rgba(24, 33, 47, 0.05);
  --shadow: 0 4px 20px rgba(24, 33, 47, 0.07);
  --shadow-card: 0 6px 24px rgba(24, 33, 47, 0.07);
  --shadow-md: 0 8px 24px rgba(24, 33, 47, 0.08);
  --shadow-hover: 0 14px 36px rgba(24, 33, 47, 0.12);
  --shadow-card-hover: 0 14px 36px rgba(24, 33, 47, 0.12);
  --shadow-modal: 0 24px 56px rgba(24, 33, 47, 0.18);
  --shadow-lg: 0 24px 56px rgba(24, 33, 47, 0.18);
  --shadow-glow: 0 4px 18px rgba(78, 102, 232, 0.22);

  --max-reading-ch: 68ch;
}

/* ── Reset & Baseline ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-canvas);
  color: var(--color-ink);
  line-height: 1.6;
  font-size: var(--text-body);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover {
  color: var(--color-primary-hover);
}

button {
  cursor: pointer;
  font-family: inherit;
  border: none;
  background: none;
  font-size: inherit;
}

input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* ── Editorial Headings Utility ── */
.font-display,
.editorial-title,
.today-greeting {
  font-family: var(--font-display) !important;
  font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
}

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

/* ── Top Header Navigation Bar (72px Calm Academic Standard) ── */
.top-header {
  background-color: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 1px 6px rgba(24, 33, 47, 0.03);
  height: 72px;
  display: flex;
  align-items: center;
}

.top-header-inner {
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  flex-shrink: 0;
  white-space: nowrap;
}

.brand-logo-img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  object-fit: cover;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  flex-shrink: 0;
}

.brand-name-wrap {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-ink);
  letter-spacing: -0.015em;
  line-height: 1.2;
  white-space: nowrap;
}

.brand-tagline {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  color: var(--color-muted);
  font-weight: 500;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

/* ── Digital SAT Core Indicator Pill ── */
.sat-core-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  background: var(--color-surface-subtle);
  color: var(--color-ink-light);
  border: 1px solid var(--color-border);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-pill);
  font-size: var(--text-meta);
  font-weight: 600;
  letter-spacing: -0.01em;
  flex-shrink: 0;
  white-space: nowrap;
}

.sat-core-pill .badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-success);
  display: inline-block;
  box-shadow: 0 0 0 2px rgba(45, 138, 87, 0.2);
  flex-shrink: 0;
}

/* ── 5-Destination Primary Navigation Tabs ── */
.primary-nav {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-shrink: 0;
}

.nav-tab {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.55rem 0.95rem;
  border-radius: var(--radius-control);
  color: var(--color-muted);
  font-weight: 500;
  font-size: var(--text-ui);
  transition: all 0.18s ease;
  position: relative;
  white-space: nowrap;
  flex-shrink: 0;
}

.nav-tab .nav-svg {
  stroke-width: 2;
  transition: stroke 0.18s ease;
}

.nav-tab:hover {
  color: var(--color-ink);
  background-color: var(--color-surface-subtle);
}

.nav-tab.active {
  color: var(--color-primary);
  background-color: var(--color-primary-soft);
  font-weight: 600;
}

.nav-tab.active .nav-svg {
  stroke: var(--color-primary);
}

/* Header Utilities */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-shrink: 0;
  white-space: nowrap;
}

.zalo-pill-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.85rem;
  background: #0284C7;
  color: #FFFFFF !important;
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: var(--radius-pill);
  transition: all 0.18s ease;
  box-shadow: var(--shadow-sm);
}
.zalo-pill-btn:hover {
  background: #0369A1;
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(2, 132, 199, 0.25);
}

/* ── Academic Pastel Card Utility Classes ── */
.card-pastel-blue {
  background-color: var(--pastel-blue);
  border: 1px solid var(--pastel-blue-border);
  color: var(--color-ink);
}
.card-pastel-green {
  background-color: var(--pastel-green);
  border: 1px solid var(--pastel-green-border);
  color: var(--color-ink);
}
.card-pastel-sage {
  background-color: var(--pastel-sage);
  border: 1px solid var(--pastel-sage-border);
  color: var(--color-ink);
}
.card-pastel-yellow {
  background-color: var(--pastel-yellow);
  border: 1px solid var(--pastel-yellow-border);
  color: var(--color-ink);
}
.card-pastel-coral {
  background-color: var(--pastel-coral);
  border: 1px solid var(--pastel-coral-border);
  color: var(--color-ink);
}
.card-pastel-lilac {
  background-color: var(--pastel-lilac);
  border: 1px solid var(--pastel-lilac-border);
  color: var(--color-ink);
}

/* ── Buttons & Controls ── */
.btn-primary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: var(--color-primary);
  color: #FFFFFF !important;
  font-weight: 600;
  font-size: var(--text-ui);
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-control);
  transition: all 0.18s ease;
  box-shadow: 0 2px 8px rgba(78, 102, 232, 0.2);
}
.btn-primary-action:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(78, 102, 232, 0.3);
}
.btn-primary-action:active {
  transform: translateY(0);
}

.btn-secondary-action, .btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: var(--color-surface);
  color: var(--color-ink);
  border: 1px solid var(--color-border);
  font-weight: 600;
  font-size: var(--text-ui);
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-control);
  transition: all 0.15s ease;
}
.btn-secondary-action:hover, .btn-outline:hover {
  background: var(--color-surface-subtle);
  border-color: #CBD5E1;
}

/* ── Filter Chips ── */
.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.45rem 1rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-muted-dark);
  font-size: var(--text-ui);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}
.filter-chip:hover {
  background: var(--color-surface-subtle);
  color: var(--color-ink);
}
.filter-chip.active {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: var(--color-primary);
  font-weight: 600;
}

/* ── Main Layout Container ── */
.main-shell {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

.section-view {
  display: none;
}
.section-view.active {
  display: block;
}

/* ═══════════════════════════════════════════════════════════════
   SECTION 1: TODAY (LEARNING COMMAND CENTER • PHASE UI-1)
   ═══════════════════════════════════════════════════════════════ */

/* ── A. Personalized Editorial Hero Card ── */
.today-hero-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-hero);
  padding: 2.25rem 2.5rem;
  box-shadow: var(--shadow-card);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: center;
  position: relative;
  overflow: hidden;
  margin-bottom: 1.5rem;
  background-image: radial-gradient(circle at top right, rgba(233, 237, 255, 0.45) 0%, transparent 60%);
}

.today-hero-content {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  max-width: 720px;
}

.today-greeting {
  font-family: var(--font-display);
  font-size: 2.1rem;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin-bottom: 0.2rem;
}

.hero-focus-statement {
  font-size: 1.05rem;
  color: var(--color-muted-dark);
  line-height: 1.5;
  margin-bottom: 0.4rem;
}

.hero-focus-tag {
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(78, 102, 232, 0.2);
  display: inline-block;
}

.hero-meta-row {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
  font-size: var(--text-ui);
  color: var(--color-muted);
  margin-bottom: 0.85rem;
}

.hero-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.meta-dot {
  color: var(--color-border);
  font-size: 0.75rem;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 0.25rem;
}

.today-hero-visual {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  max-width: 250px;
  height: 100%;
}

.today-student-cutout-img {
  max-height: 270px;
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 12px 24px rgba(24, 33, 47, 0.08));
}

/* ── B. 4 Quick Status Cards Row ── */
.status-quad-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.status-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card-sm);
  padding: 1.15rem 1.25rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

.status-card:hover {
  box-shadow: 0 8px 24px rgba(78, 102, 232, 0.12), 0 2px 8px rgba(24, 33, 47, 0.04);
  transform: translateY(-2px);
  border-color: rgba(78, 102, 232, 0.3);
  background: #FFFFFF;
}

.status-card-header {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: var(--text-meta);
  font-weight: 600;
  color: var(--color-muted);
}

.status-card-header svg {
  stroke: var(--color-primary);
}

.status-card-val {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-ink);
  letter-spacing: -0.015em;
  font-variant-numeric: tabular-nums;
}

.status-card-note {
  font-size: var(--text-xs);
  color: var(--color-muted);
  line-height: 1.4;
}

/* ── C. Dominant Today's Plan Card ── */
.today-command-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card-lg);
  padding: 2.25rem 2.5rem;
  box-shadow: var(--shadow-card);
  margin-bottom: 1.75rem;
  position: relative;
  overflow: hidden;
}

.today-command-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary) 0%, #60A5FA 100%);
}

.command-card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.plan-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-pill);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.command-title {
  font-family: var(--font-display);
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-top: 0.35rem;
  letter-spacing: -0.015em;
}

.command-meta {
  color: var(--color-muted);
  font-size: var(--text-ui);
  margin-top: 0.2rem;
}

/* Plan Activity Flow */
.plan-activities-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin: 1.25rem 0 1.5rem;
  padding: 1rem 1.25rem;
  background: var(--color-canvas);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.plan-activity-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--color-border-subtle);
  font-size: var(--text-ui);
}

.plan-activity-item:last-child {
  border-bottom: none;
}

.activity-name-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.activity-index {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-surface);
  border: 1.5px solid var(--color-primary);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--text-xs);
  flex-shrink: 0;
}

.activity-tag {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-muted);
  background: var(--color-surface);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
}

/* ── D. Secondary 3-Column Insights Grid ── */
.today-subgrid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-bottom: 1.75rem;
}

.insight-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card-sm);
  padding: 1.35rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1rem;
  transition: all 0.18s ease;
}

.insight-card:hover {
  box-shadow: var(--shadow-card);
  border-color: #CBD5E1;
  transform: translateY(-1px);
}

.insight-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--text-meta);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

.insight-body h4 {
  font-size: var(--text-h3);
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 0.35rem;
}

.insight-body p {
  font-size: var(--text-ui);
  color: var(--color-muted-dark);
  line-height: 1.5;
}

.insight-footer {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--color-border-subtle);
}

/* ── E. Strategy Tip Editorial Banner (Spec 7.2 G & Sec 8) ── */
.strategy-tip-banner {
  background: #FFFDF7;
  border: 1px solid #FDE68A;
  border-left: 4px solid #D97706;
  border-radius: var(--radius-card);
  padding: 1.5rem 1.75rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 2rem;
}

.strategy-tip-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--pastel-yellow-dark);
  flex-shrink: 0;
}

.strategy-tip-body {
  flex: 1;
}

.strategy-tip-tag {
  font-size: var(--text-2xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--pastel-yellow-dark);
  display: inline-block;
  margin-bottom: 0.2rem;
}

.strategy-tip-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: #18212F;
  margin-bottom: 0.2rem;
}

.strategy-tip-desc {
  font-size: var(--text-ui);
  color: #344054;
  line-height: 1.5;
  margin: 0;
}

/* ═══════════════════════════════════════════════════════════════
   SECTION 2: PRACTICE & LEARNING SESSION (PHASE UI-2)
   ═══════════════════════════════════════════════════════════════ */
.practice-page-hero {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.practice-page-title {
  font-family: var(--font-display);
  font-size: 2.1rem;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 0.35rem;
}

.practice-page-sub {
  font-size: 1rem;
  color: var(--color-muted);
  max-width: 680px;
  line-height: 1.5;
}

/* ── Primary Filter Chips Bar (Horizontal Scroll) ── */
.practice-filter-bar {
  margin-bottom: 1.75rem;
  overflow-x: auto;
  padding-bottom: 0.35rem;
  scrollbar-width: none;
}
.practice-filter-bar::-webkit-scrollbar {
  display: none;
}

.filter-chips-wrapper {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: nowrap;
  min-width: max-content;
}

/* ── Recommended Practice Row (Spec 8.2 C) ── */
.recommended-practice-row {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.practice-card-recommended {
  border-radius: var(--radius-card);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}
.practice-card-recommended:hover {
  box-shadow: 0 12px 32px rgba(78, 102, 232, 0.14), 0 2px 8px rgba(24, 33, 47, 0.04);
  transform: translateY(-3px);
  border-color: rgba(78, 102, 232, 0.35);
}

.practice-card-alternate {
  border-radius: var(--radius-card-sm);
  padding: 1.35rem;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}
.practice-card-alternate:hover {
  box-shadow: 0 10px 28px rgba(24, 33, 47, 0.09), 0 2px 8px rgba(24, 33, 47, 0.04);
  transform: translateY(-3px);
  border-color: rgba(78, 102, 232, 0.25);
}

/* ── 8 Domain Taxonomy Grid ── */
.domains-overview-section {
  margin-bottom: 2rem;
}

.domain-cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.domain-card-btn {
  text-align: left;
  padding: 0;
  border-radius: var(--radius-card-sm);
  border: 1px solid var(--color-border);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  min-height: 200px;
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  background: var(--color-surface);
}
.domain-card-btn:hover {
  box-shadow: 0 10px 30px rgba(78, 102, 232, 0.12), 0 2px 8px rgba(24, 33, 47, 0.05);
  transform: translateY(-3px);
  border-color: rgba(78, 102, 232, 0.35);
  background: #FFFFFF;
}
.domain-card-btn.active {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
}

.domain-card-thumb-wrap {
  width: 100%;
  height: 82px;
  overflow: hidden;
  position: relative;
  background: rgba(0, 0, 0, 0.04);
}

.domain-card-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 25%;
  display: block;
  transition: transform 0.3s ease;
}

.domain-card-btn:hover .domain-card-thumb {
  transform: scale(1.04);
}

.domain-card-content {
  padding: 1rem 1.15rem 1.15rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.domain-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.domain-card-icon {
  font-size: 1.2rem;
}

.domain-section-tag {
  font-size: var(--text-2xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-muted);
}

.domain-card-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 0.2rem;
}

.domain-card-meta {
  font-size: var(--text-2xs);
  color: var(--color-muted-dark);
  line-height: 1.4;
  margin-bottom: 0.65rem;
}

.domain-card-footer {
  margin-top: auto;
}

.domain-action-link {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-primary);
}

/* ── Practice Question Shell (High-Focus Single-Column) ── */
.question-shell {
  max-width: 860px;
  margin: 0 auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 2.25rem;
  box-shadow: var(--shadow);
}

.question-meta-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  font-size: var(--text-meta);
}

.skill-pill {
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-pill);
}

.difficulty-tag {
  font-weight: 600;
  color: var(--color-muted-dark);
  background: var(--color-canvas);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-pill);
}

/* Reading Passage Typography (65-75 ch width, 18px) */
.reading-passage-box {
  background: #FAFBFD;
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1.5rem 1.75rem;
  font-family: var(--font-serif);
  font-size: var(--text-passage);
  line-height: 1.7;
  color: #1E293B;
  margin-bottom: 1.75rem;
  max-width: var(--max-reading-ch);
}

.question-stem {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-ink);
  line-height: 1.5;
  margin-bottom: 1.5rem;
}

/* Answer Choices */
.choices-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.answer-option {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.15s ease;
  text-align: left;
  width: 100%;
}

.answer-option:hover {
  border-color: var(--color-primary);
  background: #F8FAFC;
}

.answer-option:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.choice-letter {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  background: var(--color-canvas);
  border: 1px solid var(--color-border);
  font-weight: 700;
  font-size: var(--text-ui);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--color-ink);
}

.answer-option.selected {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
}
.answer-option.selected .choice-letter {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.answer-option.correct {
  border-color: var(--color-success);
  background: var(--color-success-soft);
}
.answer-option.correct .choice-letter {
  background: var(--color-success);
  color: white;
  border-color: var(--color-success);
}

.answer-option.wrong {
  border-color: var(--color-error);
  background: var(--color-error-soft);
}
.answer-option.wrong .choice-letter {
  background: var(--color-error);
  color: white;
  border-color: var(--color-error);
}

.choice-text {
  font-size: var(--text-body);
  color: var(--color-ink);
  line-height: 1.5;
  padding-top: 2px;
}

/* ── 6-Part Structured Deliberate Feedback Panel ── */
.deliberate-feedback-panel {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 2px solid var(--color-border);
}

.feedback-result-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
}

.feedback-result-banner.success {
  background: var(--color-success-soft);
  border: 1px solid #A7F3D0;
  color: #065F46;
}

.feedback-result-banner.review {
  background: var(--color-warning-soft);
  border: 1px solid #FDE68A;
  color: #92400E;
}

.result-title {
  font-size: 1.15rem;
  font-weight: 800;
}

.feedback-section-block {
  background: var(--color-canvas);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.feedback-section-label {
  font-size: var(--text-meta);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-muted-dark);
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.feedback-text {
  font-size: var(--text-ui);
  color: var(--color-ink);
  line-height: 1.6;
}

/* Error Pattern Tag */
.error-pattern-tag {
  display: inline-block;
  background: #FEE2E2;
  color: #991B1B;
  font-size: var(--text-xs);
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-pill);
  margin-top: 0.35rem;
}

/* Lock It In: Deliberate Practice CTA */
.lock-in-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--color-primary-soft);
  border: 1px solid #BFDBFE;
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
  margin-top: 1.5rem;
}

/* ═══════════════════════════════════════════════════════════════
   SECTION 3: REVIEW (SPACED RETRIEVAL & ERROR ANALYSIS)
   ═══════════════════════════════════════════════════════════════ */
/* ═══════════════════════════════════════════════════════════════
   SECTION 3: REVIEW (SPACED RETRIEVAL & ERROR ANALYSIS • PHASE UI-3)
   ═══════════════════════════════════════════════════════════════ */
.review-hero-card {
  border-radius: var(--radius-hero);
  padding: 2.25rem 2.5rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.review-hero-content {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  max-width: 720px;
}

.review-page-title {
  font-family: var(--font-display);
  font-size: 2.1rem;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: -0.02em;
  margin-bottom: 0.2rem;
}

.review-page-sub {
  font-size: 1rem;
  color: var(--color-muted-dark);
  line-height: 1.5;
  margin-bottom: 0.4rem;
}

.review-hero-meta {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-size: var(--text-ui);
  color: var(--color-muted-dark);
  margin-bottom: 0.85rem;
  flex-wrap: wrap;
}

/* ── Error Intelligence Summary ── */
.error-intelligence-block {
  margin-bottom: 2rem;
}

.traps-summary-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.trap-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card-sm);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: all 0.18s ease;
}
.trap-card:hover {
  box-shadow: var(--shadow-card);
  border-color: #CBD5E1;
  transform: translateY(-1px);
}

.trap-type-pill {
  font-size: var(--text-2xs);
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-pill);
}

.trap-count-pill {
  font-size: var(--text-2xs);
  font-weight: 700;
  color: #991B1B;
  background: #FEE2E2;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-pill);
}

/* ── Review Dashboard Grid ── */
.review-dashboard-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.review-summary-card {
  border-radius: var(--radius-card);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all 0.18s ease;
}
.review-summary-card:hover {
  box-shadow: var(--shadow-card);
  transform: translateY(-1px);
}

.review-stat-number {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-ink);
  line-height: 1;
}

/* Flashcard Viewer */
.flashcard-stage {
  perspective: 1000px;
  width: 100%;
  max-width: 580px;
  height: 320px;
  margin: 1.5rem auto;
}

.flashcard-body {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
}

.flashcard-body.flipped {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: var(--radius-xl);
  padding: 2rem;
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.card-back {
  transform: rotateY(180deg);
  background: #F8FAFC;
  border-color: var(--color-primary);
}

/* FSRS Rating Buttons */
.fsrs-button-row {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  margin-top: 1rem;
}

.fsrs-btn {
  flex: 1;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  font-weight: 700;
  font-size: var(--text-ui);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  transition: all 0.15s;
}

.fsrs-btn.again { color: var(--color-error); }
.fsrs-btn.again:hover { background: var(--color-error-soft); border-color: var(--color-error); }
.fsrs-btn.hard { color: var(--color-warning); }
.fsrs-btn.hard:hover { background: var(--color-warning-soft); border-color: var(--color-warning); }
.fsrs-btn.good { color: var(--color-primary); }
.fsrs-btn.good:hover { background: var(--color-primary-soft); border-color: var(--color-primary); }
.fsrs-btn.easy { color: var(--color-success); }
.fsrs-btn.easy:hover { background: var(--color-success-soft); border-color: var(--color-success); }

/* Mistake Ledger Table / List */
.mistake-item-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.15rem 1.35rem;
  margin-bottom: 0.75rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: border-color 0.15s;
}
.mistake-item-card:hover {
  border-color: var(--color-primary);
}

/* ═══════════════════════════════════════════════════════════════
   SECTION 4: TEST & MOCK EXAMS
   ═══════════════════════════════════════════════════════════════ */
.test-pack-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.test-pack-card {
  background: var(--color-surface);
  border: 1px 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;
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}
.test-pack-card:hover {
  box-shadow: 0 10px 30px rgba(78, 102, 232, 0.12), 0 2px 8px rgba(24, 33, 47, 0.05);
  transform: translateY(-3px);
  border-color: rgba(78, 102, 232, 0.3);
  background: #FFFFFF;
}

.test-pack-card.featured {
  border: 2px solid var(--color-primary);
  position: relative;
}

.timer-badge {
  font-family: monospace;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-ink);
  background: var(--color-canvas);
  border: 1px solid var(--color-border);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius);
}

.timer-badge.warning {
  background: var(--color-error-soft);
  color: var(--color-error);
  border-color: #FECACA;
}

/* ═══════════════════════════════════════════════════════════════
   SECTION 5: PROGRESS & PARENT COMPANION
   ═══════════════════════════════════════════════════════════════ */
.progress-insight-banner {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.parent-companion-section {
  background: #F8FAFD;
  border: 1px solid #CBD5E1;
  border-radius: var(--radius-xl);
  padding: 2rem;
  margin-top: 2.5rem;
}

/* ═══════════════════════════════════════════════════════════════
   CONTEXTUAL AI COACH (TUTOR DRAWER)
   ═══════════════════════════════════════════════════════════════ */
.ai-coach-drawer {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 80;
}

.ai-coach-trigger-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-ink);
  color: white !important;
  font-weight: 700;
  font-size: var(--text-ui);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-lg);
  transition: transform 0.2s, background 0.2s;
}

.ai-coach-trigger-btn:hover {
  background: #1E293B;
  transform: translateY(-2px);
}

.ai-coach-modal {
  position: fixed;
  inset: 0;
  background: rgba(21, 40, 59, 0.6);
  backdrop-filter: blur(3px);
  z-index: 95;
  display: none;
  align-items: center;
  justify-content: center;
}

.ai-coach-modal.open {
  display: flex;
}

.ai-coach-box {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  max-width: 600px;
  width: 92%;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.ai-coach-header {
  padding: 1.25rem 1.5rem;
  background: var(--color-canvas);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.ai-coach-content {
  padding: 1.5rem;
  overflow-y: auto;
  flex: 1;
}

.ai-quick-prompts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.prompt-chip {
  padding: 0.35rem 0.75rem;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border: 1px solid #BFDBFE;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background 0.15s;
}

.prompt-chip:hover {
  background: #DBEAFE;
}

.ai-response-area {
  background: var(--color-canvas);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  font-size: var(--text-ui);
  line-height: 1.6;
  color: var(--color-ink);
  min-height: 120px;
}

/* ═══════════════════════════════════════════════════════════════
   RESPONSIVE DESIGN & MEDIA QUERIES
   ═══════════════════════════════════════════════════════════════ */
@media (max-width: 1024px) {
  .today-subgrid {
    grid-template-columns: 1fr;
  }
  .test-pack-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 1200px) {
  .sat-core-pill {
    display: none;
  }
}

@media (max-width: 1050px) {
  .top-header-inner {
    gap: 0.75rem;
    padding: 0 1rem;
  }
  .nav-tab {
    padding: 0.45rem 0.65rem;
    font-size: 0.8125rem;
    gap: 0.35rem;
  }
  .header-actions {
    gap: 0.45rem;
  }
  .header-actions .header-util-btn {
    padding: 0.35rem 0.6rem;
    font-size: 0.75rem;
  }
  .zalo-pill-btn {
    padding: 0.35rem 0.65rem;
    font-size: 0.75rem;
  }
}

@media (max-width: 820px) {
  .top-header {
    height: auto;
    min-height: 68px;
  }
  .top-header-inner {
    flex-wrap: wrap;
    padding: 0.5rem 0.75rem;
    gap: 0.5rem;
  }
  .primary-nav {
    order: 3;
    width: 100%;
    justify-content: space-around;
    padding-top: 0.35rem;
    border-top: 1px solid var(--color-border);
    margin-top: 0.2rem;
  }
  .strategy-tip-banner {
    flex-direction: column;
    align-items: flex-start;
    padding: 1.25rem 1rem;
    gap: 0.85rem;
  }
  .strategy-tip-media {
    display: none;
  }
}

@media (max-width: 768px) {
  .top-header {
    height: auto;
    min-height: 64px;
  }
  .top-header-inner {
    flex-wrap: wrap;
    padding: 0.5rem 0.5rem;
    gap: 0.5rem;
  }
  .primary-nav {
    order: 3;
    width: 100%;
    display: flex;
    justify-content: space-between;
    padding-top: 0.35rem;
    border-top: 1px solid var(--color-border);
    margin-top: 0.25rem;
    gap: 0.15rem;
  }
  .nav-tab {
    padding: 0.35rem 0.4rem;
    font-size: 0.72rem;
    gap: 0.2rem;
    flex-shrink: 1;
    min-width: 0;
  }
  .nav-tab .nav-svg {
    width: 14px;
    height: 14px;
  }
  .nav-tab .nav-text {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .today-greeting,
  .practice-page-title,
  .review-page-title {
    font-size: 1.45rem !important;
    line-height: 1.3 !important;
  }
  .command-title {
    font-size: 1.25rem !important;
  }
  .status-card-val {
    font-size: 1.25rem !important;
  }
  .today-hero-card {
    grid-template-columns: 1fr;
    padding: 1.25rem 1rem;
  }
  .today-hero-visual {
    display: none;
  }
  .status-quad-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }
  .header-actions {
    gap: 0.35rem;
  }
  .header-actions .header-util-btn {
    padding: 0.3rem 0.5rem;
    font-size: 0.75rem;
  }
  .zalo-pill-btn {
    padding: 0.3rem 0.6rem;
    font-size: 0.75rem;
  }
  .main-shell {
    padding: 1.25rem 0.85rem 3rem;
  }
  .review-dashboard-grid {
    grid-template-columns: 1fr;
  }
  .test-pack-grid {
    grid-template-columns: 1fr;
  }
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  .hero-cta-group button {
    width: 100%;
    justify-content: center;
  }
}

/* ═══════════════════════════════════════════════════════════════
   PRINT STYLESHEET (FOR PARENT REPORT & TEST SUMMARY)
   ═══════════════════════════════════════════════════════════════ */
@media print {
  body {
    background: white !important;
    color: black !important;
  }
  .top-header, .btn, .ai-coach-drawer, .header-actions, .primary-nav {
    display: none !important;
  }
  .main-shell {
    max-width: 100% !important;
    padding: 0 !important;
    margin: 0 !important;
  }
}

/* ═══════════════════════════════════════════════════════════════
   TEST RUNNER, QUESTION PALETTE & SCORE REPORT STYLES
   ═══════════════════════════════════════════════════════════════ */
.exam-runner-container {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 1.5rem 2rem;
  box-shadow: var(--shadow);
}

.exam-nav-palette {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 1.25rem 0;
  padding: 0.75rem;
  background: var(--color-canvas);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  max-height: 120px;
  overflow-y: auto;
}

.palette-q-btn {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-ink);
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s;
  position: relative;
}

.palette-q-btn:hover {
  border-color: var(--color-primary);
}

.palette-q-btn.current {
  border: 2px solid var(--color-primary);
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

.palette-q-btn.answered {
  background: var(--color-ink);
  color: white;
  border-color: var(--color-ink);
}

.palette-q-btn.flagged::after {
  content: '';
  position: absolute;
  top: 3px;
  right: 3px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-error);
  box-shadow: 0 0 0 1.5px var(--color-surface);
}

.exam-split-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 1rem;
}

@media (max-width: 900px) {
  .exam-split-layout {
    grid-template-columns: 1fr;
  }
}

.exam-passage-pane {
  background: var(--color-canvas);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  max-height: 480px;
  overflow-y: auto;
  font-size: 1.05rem;
  line-height: 1.7;
}

.exam-question-pane {
  display: flex;
  flex-direction: column;
}

.test-score-banner {
  background: linear-gradient(135deg, #15283B 0%, #1E3A8A 100%);
  color: white;
  border-radius: var(--radius-xl);
  padding: 2rem;
  text-align: center;
  margin-bottom: 2rem;
}

.test-score-number {
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0.5rem 0;
  color: #60A5FA;
}

.test-review-q-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-bottom: 1rem;
  background: var(--color-surface);
}

.test-review-q-item.correct {
  border-left: 4px solid var(--color-success);
}

.test-review-q-item.incorrect {
  border-left: 4px solid var(--color-error);
}

/* ═══════════════════════════════════════════════════════════════
   PRINT MEDIA & DEDICATED A4 WORKBOOK / REPORT STYLES
   ═══════════════════════════════════════════════════════════════ */
@media print {
  body {
    background: #FFFFFF !important;
    color: #0F172A !important;
    font-size: 10pt !important;
    line-height: 1.5 !important;
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }

  /* Hide interactive SPA chrome, floating widgets & modals */
  .app-container,
  .top-header,
  .btn,
  .ai-coach-drawer,
  .ai-coach-modal,
  #setup-modal,
  #share-modal,
  #desmos-modal,
  #anki-export-modal,
  #donation-floating-widget,
  #donation-collapsed-chip,
  #modal-donation-detail,
  #modal-pro-pass,
  #donation-sidebar-card,
  footer {
    display: none !important;
  }

  /* Display print portal exclusively */
  #print-portal {
    display: block !important;
    width: 100% !important;
    margin: 0 !important;
    padding: 0 !important;
    background: #FFFFFF !important;
    color: #0F172A !important;
  }

  @page {
    size: A4 portrait;
    margin: 12mm 12mm 12mm 12mm;
  }

  .print-page-break {
    page-break-before: always;
  }

  .print-no-break {
    page-break-inside: avoid;
    break-inside: avoid;
  }
}

/* Print Portal Component Styles (Clean A4 Academic Standard) */
.print-doc-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  border-bottom: 2px solid #15283B;
  padding-bottom: 0.85rem;
  margin-bottom: 1.25rem;
}

.print-brand-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.print-brand-left img {
  width: 44px;
  height: 44px;
  border-radius: 6px;
  border: 1px solid #CBD5E1;
}

.print-doc-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: #15283B;
  line-height: 1.2;
}

.print-doc-sub {
  font-size: 0.8rem;
  color: #64748B;
  margin-top: 0.15rem;
}

.print-doc-meta-right {
  text-align: right;
  font-size: 0.75rem;
  color: #475569;
}

.print-metric-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.print-metric-box {
  border: 1px solid #E2E8F0;
  border-radius: 8px;
  padding: 0.65rem;
  text-align: center;
  background: #F8FAFC;
}

.print-metric-val {
  font-size: 1.35rem;
  font-weight: 800;
  color: #1D4ED8;
  margin-bottom: 0.2rem;
}

.print-metric-lbl {
  font-size: 0.7rem;
  color: #64748B;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.print-section-heading {
  font-size: 1.05rem;
  font-weight: 800;
  color: #15283B;
  border-left: 4px solid #2563EB;
  padding-left: 0.5rem;
  margin: 1.25rem 0 0.75rem 0;
}

.print-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.25rem;
  font-size: 0.8rem;
}

.print-table th {
  background: #F1F5F9;
  border: 1px solid #CBD5E1;
  padding: 0.45rem 0.65rem;
  text-align: left;
  font-weight: 700;
  color: #1E293B;
}

.print-table td {
  border: 1px solid #E2E8F0;
  padding: 0.45rem 0.65rem;
  color: #334155;
}

.print-table tr:nth-child(even) td {
  background: #F8FAFC;
}

.print-mistake-card {
  border: 1px solid #CBD5E1;
  border-radius: 8px;
  padding: 0.9rem;
  margin-bottom: 1rem;
  page-break-inside: avoid;
  break-inside: avoid;
  background: #FFFFFF;
}

.print-footer-notice {
  border-top: 1px solid #CBD5E1;
  padding-top: 0.85rem;
  margin-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  color: #64748B;
}

/* ═══════════════════════════════════════════════════════════════
   LANDING / MARKETING OVERVIEW STYLES (PHASE UI-6)
   ═══════════════════════════════════════════════════════════════ */
.landing-hero-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card-xl);
  padding: 2.5rem;
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.landing-hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 2.5rem;
  align-items: center;
}

.landing-display-title {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-ink);
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.landing-lead-text {
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--color-muted);
  max-width: 560px;
}

.landing-trust-pills {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  font-size: var(--text-xs);
  color: var(--color-muted);
  font-weight: 600;
}

.landing-hero-media {
  position: relative;
  border-radius: var(--radius-card-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card-hover);
  border: 1px solid var(--color-border);
  background: #EBF3FE;
}

.landing-hero-img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.learning-loop-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
}

.loop-step-card {
  padding: 1.5rem 1.25rem;
  border-radius: var(--radius-card);
  border: 1px solid rgba(0, 0, 0, 0.05);
  position: relative;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.loop-step-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.loop-step-num {
  font-size: 1.75rem;
  font-weight: 800;
  font-family: var(--font-display, serif);
  opacity: 0.25;
  line-height: 1;
  margin-bottom: 0.5rem;
}

@media (max-width: 900px) {
  .landing-hero-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .landing-hero-card {
    padding: 1.5rem;
  }
  .landing-display-title {
    font-size: 2rem;
  }
}

/* ═══════════════════════════════════════════════════════════════
   P0: PRODUCTION SETUP MODAL OVERLAY & CALM ACADEMIC DIALOG
   ═══════════════════════════════════════════════════════════════ */
.setup-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

body.modal-open {
  overflow: hidden;
}

.setup-modal-dialog {
  display: grid;
  grid-template-columns: 38% 62%;
  max-width: 920px;
  width: 100%;
  max-height: calc(100vh - 48px);
  background: var(--color-surface);
  border-radius: 24px;
  overflow: hidden;
  box-shadow: 0 25px 60px -15px rgba(15, 23, 42, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.4);
}

.setup-modal-visual {
  background: linear-gradient(145deg, #1E293B, #0F172A);
  color: #FFFFFF;
  padding: 2.25rem 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.setup-brand-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.setup-brand-logo {
  border-radius: 10px;
}

.setup-brand-name {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.setup-brand-sub {
  font-size: 0.75rem;
  color: #94A3B8;
}

.setup-visual-tagline h3 {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 0.5rem;
  color: #F8FAFC;
}

.setup-visual-tagline p {
  font-size: 0.8rem;
  color: #CBD5E1;
  line-height: 1.55;
  margin-bottom: 1.25rem;
}

.setup-visual-img-wrap {
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  margin-bottom: 1.25rem;
}

.setup-visual-cover {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.setup-visual-trust {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.75rem;
  color: #94A3B8;
  font-weight: 500;
}

.setup-modal-form-pane {
  padding: 2.5rem 2.75rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: var(--color-surface);
  overflow-y: auto;
}

.setup-modal-header {
  margin-bottom: 1.5rem;
}

.setup-dialog-title {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-top: 0.35rem;
  margin-bottom: 0.35rem;
}

.setup-form-fields {
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}

.setup-field-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.setup-field-label {
  font-size: 0.825rem;
  font-weight: 700;
  color: var(--color-ink);
}

.setup-select {
  width: 100%;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius);
  border: 1.5px solid var(--color-border);
  font-size: 0.85rem;
  background-color: #FAFBFD;
  color: var(--color-ink);
  transition: border-color 0.15s ease;
}

.setup-select:focus {
  outline: none;
  border-color: var(--color-primary);
  background-color: #FFFFFF;
}

.setup-diagnostic-box {
  background: #EFF6FF;
  border: 1px solid #BFDBFE;
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
}

.setup-checkbox-label {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  font-size: 0.82rem;
  cursor: pointer;
  color: #1E3A8A;
  font-weight: 500;
  line-height: 1.45;
}

.setup-checkbox {
  accent-color: var(--color-primary);
  margin-top: 2px;
  width: 16px;
  height: 16px;
}

.setup-submit-btn {
  width: 100%;
  padding: 0.85rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-control);
  margin-top: 0.5rem;
}

@media (max-width: 768px) {
  .setup-modal-dialog {
    grid-template-columns: 1fr;
    max-height: calc(100vh - 24px);
    overflow-y: auto;
  }
  .setup-modal-visual {
    display: none;
  }
  .setup-modal-form-pane {
    padding: 1.75rem 1.5rem;
  }
  .header-actions .header-util-btn {
    padding: 0.35rem 0.55rem;
  }
}

/* ── Active Exam Distraction-Free Isolation (Spec 10.3) ── */
body.exam-mode-active .top-header,
body.exam-mode-active .ai-coach-drawer,
body.exam-mode-active footer,
body.exam-mode-active #donation-sidebar-card,
body.exam-mode-active #donation-collapsed-chip {
  display: none !important;
}

/* ═══════════════════════════════════════════════════════════
   DONATION WIDGET & MODAL (BUY ME A COFFEE • THEME-ALIGNED)
   ═══════════════════════════════════════════════════════════ */
#donation-sidebar-card {
  position: fixed;
  right: 18px;
  top: 96px;
  width: 260px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
  background: var(--color-surface);
  border: 1.5px solid var(--pastel-yellow-border);
  border-radius: var(--radius-card-sm);
  padding: 12px 12px 14px;
  box-shadow: var(--shadow-card-hover);
  z-index: 85;
  font-family: var(--font-sans);
  color: var(--color-ink);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.donation-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
  padding: 0 2px;
}

.donation-title {
  font-weight: 800;
  font-size: 0.95rem;
  color: var(--pastel-yellow-dark);
  display: flex;
  align-items: center;
  gap: 6px;
  letter-spacing: 0.01em;
}

.donation-close-btn {
  background: var(--color-surface-subtle);
  border: 1px solid var(--color-border-subtle);
  color: var(--color-muted);
  border-radius: var(--radius-sm);
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 0.8rem;
  line-height: 1;
  transition: all 0.2s ease;
}

.donation-close-btn:hover {
  background: var(--color-error-soft);
  border-color: var(--color-error);
  color: var(--color-error);
}

.donation-desc {
  font-size: 0.74rem;
  color: var(--color-muted-dark);
  line-height: 1.45;
  margin-bottom: 10px;
  padding: 0 2px;
}

.donation-account-box {
  background: var(--color-canvas);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 9px;
  margin-bottom: 10px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.donation-account-box:hover {
  border-color: var(--pastel-yellow-border);
  box-shadow: var(--shadow-sm);
}

.donation-box-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.donation-badge-tcb {
  background: #E11D48;
  color: #FFFFFF;
  font-weight: 900;
  font-size: 0.62rem;
  padding: 2px 5px;
  border-radius: 4px;
  letter-spacing: 0.02em;
}

.donation-badge-momo {
  background: #A21CAF;
  color: #FFFFFF;
  font-weight: 900;
  font-size: 0.62rem;
  padding: 2px 5px;
  border-radius: 4px;
  letter-spacing: 0.02em;
}

.donation-bank-name {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-ink);
}

.donation-network-tag {
  font-size: 0.65rem;
  color: var(--color-muted);
  font-weight: 500;
}

.donation-qr-frame {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 6px;
  display: flex;
  justify-content: center;
  margin-bottom: 8px;
}

.donation-qr-frame img {
  width: 100%;
  max-width: 175px;
  aspect-ratio: 1/1;
  object-fit: contain;
  border-radius: 4px;
  display: block;
}

.donation-box-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 3px;
}

.donation-acc-num {
  font-weight: 800;
  font-size: 0.88rem;
  color: var(--pastel-yellow-dark);
  letter-spacing: 0.02em;
  font-family: var(--font-sans);
}

.donation-copy-btn {
  background: var(--color-warning-soft);
  border: 1px solid var(--pastel-yellow-border);
  color: var(--pastel-yellow-dark);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: all 0.2s ease;
}

.donation-copy-btn:hover {
  background: var(--pastel-yellow-dark);
  color: #FFFFFF;
}

.donation-box-owner {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--color-ink-light);
  text-align: center;
  margin-top: 1px;
}

.donation-box-sub {
  font-size: 0.65rem;
  color: var(--color-muted);
  text-align: center;
  margin-top: 2px;
}

.donation-footer-btn {
  width: 100%;
  background: var(--color-surface-subtle);
  border: 1px solid var(--color-border);
  color: var(--color-ink);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 8px 10px;
  border-radius: var(--radius-control);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.donation-footer-btn:hover {
  background: var(--color-warning-soft);
  border-color: var(--pastel-yellow-border);
  color: var(--pastel-yellow-dark);
}

#donation-collapsed-chip {
  display: none;
  position: fixed;
  right: 18px;
  top: 96px;
  z-index: 85;
  background: var(--color-surface);
  border: 1.5px solid var(--pastel-yellow-border);
  color: var(--pastel-yellow-dark);
  font-size: 0.8rem;
  font-weight: 800;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

#donation-collapsed-chip:hover {
  background: var(--color-warning-soft);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

.donation-modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(24, 33, 47, 0.75);
  z-index: 9999;
  backdrop-filter: blur(6px);
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.donation-modal-body {
  max-width: 580px;
  width: 100%;
  max-height: 92vh;
  overflow-y: auto;
  position: relative;
  box-shadow: var(--shadow-modal);
  padding: 1.75rem;
  background: var(--color-surface);
  border: 1.5px solid var(--pastel-yellow-border);
  color: var(--color-ink);
  border-radius: var(--radius-card-lg);
}

@media (max-width: 1024px) {
  #donation-sidebar-card {
    right: 10px;
    top: 80px;
    width: 230px;
  }
}

@media (max-width: 840px) {
  #donation-sidebar-card {
    display: none;
  }
  #donation-collapsed-chip {
    top: auto;
    bottom: 76px;
    right: 14px;
  }
}

/* ── Floating Toast Notification (Non-intrusive) ── */
.sat-toast-notification {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--color-ink);
  color: #FFFFFF;
  padding: 0.65rem 1.35rem;
  border-radius: var(--radius-pill);
  font-size: var(--text-ui);
  font-weight: 600;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.28);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  z-index: 99999;
  opacity: 0;
  pointer-events: none;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}
.sat-toast-notification.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ── Language Switcher Pill Active Feedback ── */
#toggle-lang {
  transition: all 0.2s ease;
  min-width: 90px;
  justify-content: center;
}
#toggle-lang:hover {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: var(--color-primary);
}