:root,
[data-theme="dark"] {
  color-scheme: dark;

  /* Modern Educational Palette — Lively, Balanced Role-Based System */
  --accent: #E26D5C;
  --accent-hover: #EC7C6B;
  --accent-text: #FF8574;
  --accent-tint: rgba(226, 109, 92, 0.16);
  --accent-border: rgba(226, 109, 92, 0.40);
  --on-accent: #FFFFFF;
  --card: var(--bg-card);

  /* Backward Compatibility Aliases */
  --primary: var(--accent);
  --primary-hover: var(--accent-hover);
  --primary-soft: var(--accent-tint);
  --primary-border: var(--accent-border);
  --primary-glow: transparent;
  --on-primary: var(--on-accent);
  --brand-accent: var(--accent);
  --brand-glow: transparent;

  /* Section Accents (Mint / Coral / Amber) */
  --accent-lectures: #3EB88A;
  --accent-lectures-hover: #4AC798;
  --accent-lectures-soft: rgba(62, 184, 138, 0.16);
  --accent-lectures-border: #31525B;
  --accent-lectures-surface: transparent;
  --accent-lectures-card: #1C333A;
  --accent-lectures-text: #59CE9E;

  --accent-bank: #E26D5C;
  --accent-bank-hover: #EC7C6B;
  --accent-bank-soft: rgba(226, 109, 92, 0.16);
  --accent-bank-border: #31525B;
  --accent-bank-surface: transparent;
  --accent-bank-card: #1C333A;
  --accent-bank-text: #FF8574;

  --accent-sheets: #E8A63A;
  --accent-sheets-hover: #F3B349;
  --accent-sheets-soft: rgba(232, 166, 58, 0.16);
  --accent-sheets-border: #31525B;
  --accent-sheets-surface: transparent;
  --accent-sheets-card: #1C333A;
  --accent-sheets-text: #F5B84D;

  /* Deep Warm Teal Supporting Background & Medium-Dark Slate-Teal Surfaces */
  /* Warm Clay Study Palette Reference (#F6F1E8) */
  --bg: #132227;
  --bg-deep-contrast: #0E1B1F;
  --bg-secondary: #112025;
  --bg-sidebar: #112025;
  --bg-card: #1D3339;
  --bg-card-hover: #243F47;
  --bg-elevated: #2B4A53;
  --bg-elevated-hover: #32555F;
  --border: #345963;
  --border-subtle: #294851;
  --border-strong: #467481;
  --text: #F0F5F6;
  --text-secondary: #CAD9DC;
  --text-muted: #8EA5AA;

  /* Distinct Semantic Role Colors */
  --success: #3EB88A;
  --success-bg: rgba(62, 184, 138, 0.16);
  --success-border: rgba(62, 184, 138, 0.40);
  --danger: #D45B65;
  --danger-bg: rgba(212, 91, 101, 0.16);
  --danger-border: rgba(212, 91, 101, 0.40);
  --warning: #E8A63A;
  --warning-bg: rgba(232, 166, 58, 0.16);
  --warning-border: rgba(232, 166, 58, 0.40);
  --progress: #E58343;
  --progress-bg: rgba(229, 131, 67, 0.16);
  --progress-border: rgba(229, 131, 67, 0.40);
  --teal-soft: #3AA8A4;

  --table-stripe: rgba(255, 255, 255, 0.03);
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius: 10px;
  --radius-controls: 10px;
  --radius-card: 16px;
  --radius-lg: 16px;

  --shadow-sm: 0 2px 8px rgba(6, 18, 22, 0.25), 0 1px 3px rgba(6, 18, 22, 0.20);
  --shadow-md: 0 12px 28px -4px rgba(6, 18, 22, 0.40), 0 4px 10px rgba(6, 18, 22, 0.24);

  /* Motion Tokens */
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --t-fast: 140ms;
  --t-base: 220ms;
  --muted: var(--text-muted);
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* APPLICATION SHELL WITH PERSISTENT LEFT SIDEBAR */
.app-shell {
  min-height: 100vh;
  min-height: 100dvh;
  width: 100%;
  position: relative;
}

@media (min-width: 769px) {
  .app-shell {
    display: flex;
  }
  .app-sidebar {
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    width: 264px;
    height: 100vh;
    height: 100dvh;
    overflow-y: auto;
    overscroll-behavior: contain;
    z-index: 50;
  }
  .app-content-area {
    margin-left: 264px;
    width: calc(100% - 264px);
    min-width: 0;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    flex: 1 1 auto;
  }
  html[dir="rtl"] .app-sidebar,
  [dir="rtl"] .app-sidebar {
    left: auto;
    right: 0;
    border-right: none;
    border-left: 1px solid var(--border);
  }
  html[dir="rtl"] .app-content-area,
  [dir="rtl"] .app-content-area {
    margin-left: 0;
    margin-right: 264px;
  }
}

.app-sidebar {
  display: flex;
  flex-direction: column;
}

.sidebar-brand-bar {
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--border);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  cursor: pointer;
  user-select: none;
  text-decoration: none;
}

.brand:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
  border-radius: var(--radius-xs);
}

.brand-mark-svg {
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  filter: drop-shadow(0 0 10px var(--brand-glow));
}

.brand-mark-svg svg {
  display: block;
}

.brand-title {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

.sidebar-group-label {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  padding: 0 0.6rem;
  margin-bottom: 0.35rem;
}

.sidebar-primary-nav {
  padding: 0.85rem 0.65rem 0.65rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  border-bottom: 1px solid var(--border-subtle);
}

.sidebar-subjects-section {
  padding: 0.85rem 0.65rem;
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.sidebar-subjects-list {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.sidebar-subject-item {
  width: 100%;
  text-align: left;
  background-color: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 0.48rem 0.6rem;
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-family: inherit;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  transition: background-color 0.12s ease, border-color 0.12s ease, color 0.12s ease;
}

.sidebar-subject-item:hover {
  background-color: var(--bg-card);
  color: var(--text);
}

.sidebar-subject-item.active {
  background-color: var(--primary-soft);
  border-color: var(--primary-border);
  color: var(--text);
  font-weight: 600;
}

.sidebar-subject-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-subject-counts {
  font-size: 0.68rem;
  color: var(--text-muted);
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  padding: 0.1rem 0.38rem;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}

.sidebar-footer {
  padding: 0.85rem 1rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: center;
}

.sidebar-reset-link {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-family: inherit;
  cursor: pointer;
  padding: 0.5rem 0.75rem;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-xs);
  transition: color 0.15s ease, background-color 0.15s ease;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.sidebar-reset-link:hover {
  color: var(--danger);
  background-color: var(--danger-bg);
}

.sidebar-reset-link:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* MAIN WORKSPACE CONTENT AREA */
.app-content-area {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.app-topbar {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 0.65rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.topbar-context {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text-secondary);
}

/* TOPBAR CREATOR BADGE & DIGITAL SIGNATURE */
.topbar-creator-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.74rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  padding: 0.26rem 0.65rem;
  color: var(--text-secondary);
}

.creator-signature {
  display: inline-flex;
  align-items: center;
  gap: 0.32rem;
  font-weight: 600;
  color: var(--text);
}

.signature-icon {
  font-size: 0.84rem;
  line-height: 1;
}

.signature-name {
  font-family: "Segoe Script", "Brush Script MT", "Caveat", "Dancing Script", cursive, Georgia, serif;
  font-size: 0.84rem;
  letter-spacing: 0.02em;
  color: var(--primary-hover);
  font-style: italic;
  font-weight: 700;
}

.creator-divider {
  color: var(--border-strong);
  font-size: 0.7rem;
}

.creator-website-link {
  display: inline-flex;
  align-items: center;
  gap: 0.28rem;
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  padding: 0.12rem 0.45rem;
  transition: border-color 0.14s ease, color 0.14s ease, background-color 0.14s ease;
}

.creator-website-link:hover {
  border-color: var(--primary);
  color: var(--primary);
  background-color: var(--bg-elevated);
}

.creator-website-link:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.creator-feedback {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.72rem;
  color: var(--text-muted);
}

.creator-tg-link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  color: #229ED9;
  font-weight: 600;
  text-decoration: none;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  padding: 0.12rem 0.4rem;
  transition: border-color 0.14s ease, color 0.14s ease, background-color 0.14s ease;
}

.creator-tg-link:hover {
  border-color: #229ED9;
  background-color: var(--bg-elevated);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.creator-tg-link:focus-visible {
  outline: 2px solid #229ED9;
  outline-offset: 2px;
}

.tg-svg-icon {
  flex-shrink: 0;
  display: inline-block;
  vertical-align: middle;
}

.topbar-meta {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.topbar-pill {
  font-size: 0.75rem;
  color: var(--text-secondary);
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  padding: 0.22rem 0.58rem;
  font-variant-numeric: tabular-nums;
}

.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.38rem;
  padding: 0.24rem 0.65rem;
  font-size: 0.76rem;
  font-weight: 600;
  background-color: var(--bg-card);
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-xs);
  cursor: pointer;
  transition: background-color 0.14s ease, border-color 0.14s ease, color 0.14s ease;
}

.theme-toggle-btn:hover {
  background-color: var(--bg-elevated);
  border-color: var(--primary);
}

.theme-toggle-icon {
  font-size: 0.84rem;
  line-height: 1;
  color: var(--primary);
}

.container {
  max-width: 1320px;
  width: 100%;
  margin: 0 auto;
  padding: 1.25rem 1.5rem 3rem;
}

.view {
  display: none;
}

.view.active {
  display: block;
  animation: viewFadeIn 150ms var(--ease);
}

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

/* LINKS */
a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: color var(--t-fast) var(--ease),
              text-decoration-color var(--t-fast) var(--ease);
}

@media (hover: hover) {
  a:hover {
    color: var(--accent-text);
    text-decoration-color: var(--accent-text);
  }
}

/* BUTTONS */
.btn {
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 0.48rem 0.9rem;
  font-size: 0.84rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background-color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease),
              color var(--t-fast) var(--ease),
              transform var(--t-fast) var(--ease),
              box-shadow var(--t-fast) var(--ease);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  line-height: 1.25;
  text-decoration: none;
}

.btn:active:not(:disabled) {
  transform: translateY(1px) scale(0.98);
}

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

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-sm {
  padding: 0.36rem 0.72rem;
  font-size: 0.78rem;
}

.btn-primary {
  background-color: var(--primary);
  color: var(--on-primary);
  border-color: var(--primary);
}

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

.btn-secondary {
  background-color: var(--bg-elevated);
  color: var(--text);
  border-color: var(--border);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--bg-elevated-hover);
  border-color: var(--border-strong);
}

.btn-ghost {
  background-color: var(--bg-card);
  color: var(--text-secondary);
  border-color: var(--border);
}

.btn-ghost:hover:not(:disabled) {
  color: var(--text);
  background-color: var(--bg-elevated);
  border-color: var(--border-strong);
}

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

.btn-danger:hover:not(:disabled) {
  background-color: rgba(248, 113, 113, 0.2);
  border-color: var(--danger);
}

.btn-danger-outline {
  background-color: transparent;
  color: var(--danger);
  border: 1px solid var(--danger-border);
}

.btn-danger-outline:hover:not(:disabled) {
  background-color: var(--danger-bg);
  border-color: var(--danger);
}

.btn-nav {
  width: 100%;
  justify-content: flex-start;
  background-color: transparent;
  color: var(--text-secondary);
  padding: 0.48rem 0.65rem;
  border-color: transparent;
  font-weight: 500;
  font-size: 0.84rem;
}

.btn-nav:hover {
  color: var(--text);
  background-color: var(--bg-card);
}

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

.btn-back {
  background-color: var(--bg-card);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  padding: 0.4rem 0.8rem;
  font-size: 0.8125rem;
  font-weight: 600;
}

.btn-back:hover {
  color: var(--text);
  border-color: var(--primary);
  background-color: var(--bg-elevated);
}

/* BREADCRUMB BAR & JUMP PILLS */
.breadcrumb-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.9rem;
  flex-wrap: wrap;
}

.workspace-jump-pills {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.workspace-jump-pills .jump-pill-lectures {
  border-left: 3px solid var(--accent-lectures);
}

.workspace-jump-pills .jump-pill-bank {
  border-left: 3px solid var(--accent-bank);
}

.workspace-jump-pills .jump-pill-sheets {
  border-left: 3px solid var(--accent-sheets);
}

/* CONTINUE WHERE YOU LEFT OFF BANNER */
.continue-banner {
  background-color: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 0.95rem 1.25rem;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  box-shadow: var(--shadow-sm);
}

.continue-banner.hidden {
  display: none !important;
}

.continue-info {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
}

.continue-label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.continue-title {
  font-size: 0.95rem;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* STATS OVERVIEW (SINGLE COMPACT ROW OF 4 NUMBERS BELOW SUBJECTS) */
.stats-overview-block {
  margin-top: 2.25rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
}

/* Stats overview block legacy placeholder */

.stat-label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stat-value {
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
}

.stat-value.highlight {
  color: var(--primary-hover);
}

/* SECTION HEADERS */
.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 0.85rem;
  margin-bottom: 0.85rem;
  flex-wrap: wrap;
}

.section-header.compact-header {
  margin-bottom: 0.7rem;
}

.section-title {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

.section-subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.12rem;
}

/* COMPACT SUBJECT CARDS GRID (DASHBOARD) */
.subjects-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.15rem;
}

.subject-card {
  --subject-accent: var(--primary);
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.15rem 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.95rem;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform 0.18s ease, background-color 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
  text-align: left;
}

.subject-card:hover {
  transform: translateY(-2px);
  background-color: var(--bg-elevated);
  border-color: var(--amber-primary, #E5A93C) !important;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.subject-card[data-subject-id="machine-learning-pattern-recognition"] {
  --subject-accent: #E26D5C;
}

.subject-card[data-subject-id="data-communication-networks-csc214"] {
  --subject-accent: #3EB88A;
}

.subject-card[data-subject-id="data-mining"] {
  --subject-accent: #74B558;
}

.subject-card[data-subject-id="logic-number-systems"] {
  --subject-accent: #E8A63A;
}

.subject-card[data-subject-id="operations-research"] {
  --subject-accent: #E58343;
}

.subject-card[data-subject-id="numerical-analysis"] {
  --subject-accent: #C86558;
}

.subject-card:focus {
  outline: none;
  border-color: var(--border);
}

.subject-card:focus-visible {
  outline: 2px solid var(--border-strong, #3D434D);
  outline-offset: 2px;
}

.subject-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.subject-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.3;
}

.subject-card-arrow {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-xs);
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.84rem;
  flex-shrink: 0;
  transition: background-color 0.14s ease, color 0.14s ease, border-color 0.14s ease;
}

.subject-card:hover .subject-card-arrow {
  background-color: var(--primary);
  color: var(--on-primary);
  border-color: var(--primary);
}

.subject-card-lines {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.45rem;
  padding: 0.7rem 0;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.subject-card-line {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 0.12rem;
  min-width: 0;
  padding: 0.42rem 0.5rem;
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  background-color: color-mix(in srgb, var(--bg-secondary) 72%, transparent);
  font-size: 0.68rem;
  color: var(--text-muted);
}

.subject-card-line strong {
  color: var(--text);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.subject-card-line .line-label {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

.subject-card-line .line-value {
  color: var(--text);
  font-size: 0.88rem;
  font-weight: 700;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.subject-card-progress {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.subject-progress-track {
  flex: 1;
  height: 4px;
  background-color: var(--border);
  border-radius: 999px;
  overflow: hidden;
}

.subject-progress-fill {
  height: 100%;
  background-color: var(--accent);
  opacity: 1;
  border-radius: 999px;
  transition: width var(--t-base) var(--ease);
}

.subject-progress-pct {
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  width: 34px;
  text-align: right;
}

/* SUBJECT WORKSPACE HERO & TABS */
.subject-hero-banner.compact {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.15rem 1.25rem;
  margin-bottom: 1.35rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  box-shadow: var(--shadow-sm);
}

.subject-hero-banner.compact .subject-hero-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 0.25rem;
  color: var(--text);
}

.subject-hero-banner.compact .subject-hero-meta {
  color: var(--text-muted);
  font-size: 0.8125rem;
  font-variant-numeric: tabular-nums;
}

/* SUBJECT TABS BAR (UNDERLINE STYLE) */
.subject-tabs-bar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0;
}

.subject-tab-btn {
  background: transparent;
  border: none;
  border-radius: 0;
  padding: 0.75rem 0.25rem;
  font-size: 0.9rem;
  font-weight: 500;
  font-family: inherit;
  color: var(--text-muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  min-height: 40px;
  margin-bottom: -1px;
  position: relative;
  transition: color var(--t-fast) var(--ease);
}

.subject-tab-btn::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t-base) var(--ease);
}

.subject-tab-btn:hover {
  background: transparent;
  color: var(--text);
}

.subject-tab-btn:focus-visible {
  outline: 2px solid var(--accent-border);
  outline-offset: 2px;
}

.subject-tab-btn.active {
  background: transparent;
  color: var(--accent-text);
  font-weight: 600;
}

.subject-tab-btn.active::after {
  transform: scaleX(1);
}

.subject-tab-btn .tab-count {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  padding: 0.1rem 0.45rem;
  background-color: var(--bg-card);
  border-radius: 999px;
}

.subject-tab-btn.active .tab-count {
  background-color: var(--accent-tint);
  color: var(--accent-text);
}

.subject-tab-panels {
  width: 100%;
}

.subject-tab-panel {
  display: none;
}

.subject-tab-panel.active {
  display: block;
}

.workspace-category-block {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.15rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  box-shadow: var(--shadow-sm);
}

.category-block-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.65rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--border);
}

.category-block-header .section-title {
  margin-top: 0;
  font-size: 1.05rem;
}

/* DISTINCT NEUTRAL ACCENTS FOR EACH OF THE THREE SECTIONS */

/* 1. Lecture Summaries — Subtle Muted Sage-Teal Accent */
#studyMaterialsSection {
  background-color: var(--accent-lectures-surface);
  border-color: var(--accent-lectures-border);
  border-top: 3px solid var(--accent-lectures);
}

#studyMaterialsSection .category-block-header {
  border-bottom-color: var(--accent-lectures-border);
}

#studyMaterialsSection .section-title {
  color: var(--accent-lectures-text);
}

#studyMaterialsSection #studyMaterialsCountBadge {
  background-color: var(--accent-lectures-soft);
  border-color: var(--accent-lectures-border);
  color: var(--accent-lectures-text);
}

#studyMaterialsSection .lecture-card {
  background-color: var(--accent-lectures-card);
  border-color: var(--accent-lectures-border);
}

#studyMaterialsSection .lecture-card:hover {
  border-color: var(--accent-lectures);
  background-color: var(--bg-elevated);
}

#studyMaterialsSection .btn-primary {
  background-color: var(--accent-lectures);
  border-color: var(--accent-lectures);
  color: var(--on-primary);
}

#studyMaterialsSection .btn-primary:hover:not(:disabled) {
  background-color: var(--accent-lectures-hover);
  border-color: var(--accent-lectures-hover);
}

/* 2. Question Bank — Subtle Muted Slate Accent */
#originalQuestionBankSection {
  background-color: var(--accent-bank-surface);
  border-color: var(--accent-bank-border);
  border-top: 3px solid var(--accent-bank);
}

#originalQuestionBankSection .category-block-header {
  border-bottom-color: var(--accent-bank-border);
}

#originalQuestionBankSection .section-title {
  color: var(--accent-bank-text);
}

#originalQuestionBankSection #originalBankCountBadge {
  background-color: var(--accent-bank-soft);
  border-color: var(--accent-bank-border);
  color: var(--accent-bank-text);
}

#originalQuestionBankSection .quiz-card {
  background-color: var(--accent-bank-card);
  border-color: var(--accent-bank-border);
}

#originalQuestionBankSection .quiz-card:hover {
  border-color: var(--accent-bank);
  background-color: var(--bg-elevated);
}

#originalQuestionBankSection .btn-primary {
  background-color: var(--accent-bank);
  border-color: var(--accent-bank);
  color: var(--on-primary);
}

#originalQuestionBankSection .btn-primary:hover:not(:disabled) {
  background-color: var(--accent-bank-hover);
  border-color: var(--accent-bank-hover);
}

/* 3. Sheets — Subtle Warm Stone / Taupe Accent */
#sheetsSection {
  background-color: var(--accent-sheets-surface);
  border-color: var(--accent-sheets-border);
  border-top: 3px solid var(--accent-sheets);
}

#sheetsSection .category-block-header {
  border-bottom-color: var(--accent-sheets-border);
}

#sheetsSection .section-title {
  color: var(--accent-sheets-text);
}

#sheetsSection #sheetsCountBadge {
  background-color: var(--accent-sheets-soft);
  border-color: var(--accent-sheets-border);
  color: var(--accent-sheets-text);
}

#sheetsSection .sheet-card {
  background-color: var(--accent-sheets-card);
  border-color: var(--accent-sheets-border);
}

#sheetsSection .sheet-card:hover {
  border-color: var(--accent-sheets);
  background-color: var(--bg-elevated);
}

#sheetsSection .btn-primary {
  background-color: var(--accent-sheets);
  border-color: var(--accent-sheets);
  color: var(--on-primary);
}

#sheetsSection .btn-primary:hover:not(:disabled) {
  background-color: var(--accent-sheets-hover);
  border-color: var(--accent-sheets-hover);
}

/* LECTURES GRID, QUIZZES GRID & SHEETS GRID */
.lectures-grid,
.quizzes-grid,
.sheets-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(255px, 1fr));
  gap: 0.75rem;
}

.lecture-card,
.quiz-card,
.sheet-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.85rem 0.95rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.7rem;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.14s ease, background-color 0.14s ease, box-shadow 0.14s ease;
}

.lecture-card {
  cursor: pointer;
}

.lecture-card:hover,
.quiz-card:hover,
.sheet-card:hover {
  border-color: var(--primary);
  background-color: var(--bg-card-hover);
  box-shadow: var(--shadow-md);
}

.lecture-card-header,
.quiz-card-header {
  display: flex;
  flex-direction: column;
  gap: 0.28rem;
}

.lecture-availability-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
}

.lecture-card-title,
.quiz-card-title {
  font-size: 0.93rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.32;
  word-break: break-word;
}

.quiz-meta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.38rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.quiz-meta-row strong {
  color: var(--text-secondary);
  font-weight: 600;
}

.quiz-stats-strip {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  padding: 0.42rem 0.55rem;
  font-size: 0.74rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.35rem;
  text-align: center;
  color: var(--text-muted);
}

.quiz-stats-strip.four-cols {
  grid-template-columns: repeat(4, 1fr);
}

.quiz-stat-cell {
  display: flex;
  flex-direction: column;
  gap: 0.05rem;
}

.quiz-stat-cell span {
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.quiz-stat-cell strong {
  font-size: 0.82rem;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.quiz-card-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.4rem;
}

.quiz-card-actions .inspect-quiz-btn,
.lecture-card-actions .open-lecture-btn {
  grid-column: 1 / -1;
  width: 100%;
}

.empty-category-box {
  background-color: var(--bg-card);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 1rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.82rem;
}

/* BADGES */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.15rem 0.48rem;
  border-radius: var(--radius-xs);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.badge-subject {
  background-color: var(--primary-soft);
  color: var(--text);
  border: 1px solid var(--primary-border);
}

.badge-mode {
  background-color: var(--bg-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.badge-success {
  background-color: var(--success-bg);
  color: var(--success);
  border: 1px solid var(--success-border);
}

/* LEVEL 3: DEDICATED LECTURE STUDY PAGE (SUMMARY + 20-MCQ PRACTICE QUIZ ON SAME PAGE) */
.lecture-sticky-bar {
  position: sticky;
  top: 0;
  z-index: 30;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.7rem 0.95rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
  box-shadow: var(--shadow-sm);
}

.lecture-bar-left {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.lecture-bar-titles {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.lecture-page-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}

.lecture-bar-actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}

/* LECTURE SUMMARY READER */
.lecture-summary-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.4rem;
  margin-bottom: 1.35rem;
  box-shadow: var(--shadow-sm);
}

.lecture-summary-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding-bottom: 0.8rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.lecture-summary-heading {
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--text);
  margin-top: 0.2rem;
}

.lecture-summary-reader {
  color: var(--text);
  font-size: 0.92rem;
  line-height: 1.65;
}

.lecture-doc .summary-section {
  margin-bottom: 1.35rem;
  padding-bottom: 1.15rem;
  border-bottom: 1px solid var(--border-subtle);
}

.lecture-doc .summary-section:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.lecture-doc h2 {
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--primary-hover);
  margin-bottom: 0.55rem;
}

.lecture-doc h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin: 0.85rem 0 0.4rem;
}

.lecture-doc p {
  margin-bottom: 0.6rem;
  color: var(--text-secondary);
}

.lecture-doc ul,
.lecture-doc ol {
  margin: 0.4rem 0 0.7rem 1.3rem;
  color: var(--text-secondary);
}

.lecture-doc li {
  margin-bottom: 0.3rem;
}

.lecture-doc strong {
  color: var(--text);
}

.lecture-doc code {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  padding: 0.12rem 0.4rem;
  border-radius: var(--radius-xs);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.85em;
  color: var(--primary-hover);
}

.bilingual-block,
.bilingual-block.arabic-block {
  background-color: var(--bg-secondary) !important;
  border: 1px solid var(--border) !important;
  border-right: 3px solid var(--primary) !important;
  border-radius: var(--radius-xs);
  padding: 0.65rem 0.9rem;
  margin: 0.55rem 0 0.8rem;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.def-box {
  background-color: var(--primary-soft);
  border: 1px solid var(--primary-border);
  border-left: 3px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 0.75rem 0.95rem;
  margin: 0.7rem 0;
}

.def-title {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--primary-hover);
  margin-bottom: 0.28rem;
}

.note-box {
  background-color: var(--warning-bg);
  border: 1px solid var(--warning-border);
  border-left: 3px solid var(--warning);
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.9rem;
  margin: 0.7rem 0;
  font-size: 0.86rem;
  color: var(--text-secondary);
}

.formula-box {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.95rem;
  margin: 0.7rem 0;
  font-size: 0.88rem;
}

.table-wrap {
  overflow-x: auto;
  margin: 0.7rem 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.summary-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.84rem;
  text-align: left;
}

.summary-table th {
  background-color: var(--bg-secondary);
  color: var(--text);
  font-weight: 700;
  padding: 0.52rem 0.7rem;
  border-bottom: 1px solid var(--border);
}

.summary-table td {
  padding: 0.52rem 0.7rem;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  vertical-align: top;
}

.summary-table tr:last-child td {
  border-bottom: none;
}

.summary-table tr:nth-child(even) td {
  background-color: var(--table-stripe);
}

/* EMBEDDED LECTURE PRACTICE QUIZ SECTION */
.lecture-quiz-section {
  background-color: var(--bg-secondary);
  border: 1px solid var(--primary-border);
  border-radius: var(--radius);
  padding: 1.15rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.lecture-quiz-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.9rem;
  flex-wrap: wrap;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.lecture-quiz-stats-strip {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.45rem 0.75rem;
  display: grid;
  grid-template-columns: repeat(4, minmax(68px, 1fr));
  gap: 0.55rem;
  text-align: center;
}

.lecture-quiz-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.lecture-quiz-modes,
.lecture-quiz-options {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.lecture-inline-results {
  background-color: var(--bg-card);
  border: 1px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.9rem;
  flex-wrap: wrap;
}

.inline-results-score {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.score-big-inline {
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--primary-hover);
  font-variant-numeric: tabular-nums;
}

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

.inline-results-filters {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.lecture-questions-list {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.lecture-quiz-submit-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding-top: 0.7rem;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}

/* QUIZ PLAYER & QUESTION CARDS */
.quiz-top-bar {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.8rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  margin-bottom: 0.95rem;
  flex-wrap: wrap;
}

.quiz-top-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.quiz-title-group {
  display: flex;
  flex-direction: column;
  gap: 0.12rem;
}

.quiz-title-group h2 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}

.quiz-controls-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.toggle-inline {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
}

.toggle-inline input {
  accent-color: var(--primary);
  width: 14px;
  height: 14px;
}

.progress-wrapper {
  margin-bottom: 0.95rem;
}

.progress-wrapper.compact {
  margin-bottom: 0.25rem;
}

.progress-info {
  display: flex;
  justify-content: space-between;
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.3rem;
  font-variant-numeric: tabular-nums;
}

.progress-bar-track {
  height: 6px;
  background-color: var(--bg-secondary);
  border-radius: var(--radius-xs);
  overflow: hidden;
  border: 1px solid var(--border);
}

.progress-bar-fill {
  height: 100%;
  background-color: var(--primary);
  transition: width var(--t-base) var(--ease);
}

.question-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.05rem 1.15rem;
  margin-bottom: 0.9rem;
  box-shadow: var(--shadow-sm);
}

.question-card.lecture-q-card {
  margin-bottom: 0;
}

.question-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  margin-bottom: 0.65rem;
  flex-wrap: wrap;
}

.question-meta-left {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.question-num-badge {
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--primary-hover);
  font-weight: 700;
  font-size: 0.73rem;
  padding: 0.18rem 0.5rem;
  border-radius: var(--radius-xs);
  font-variant-numeric: tabular-nums;
}

.question-review-badge {
  background-color: var(--warning-bg);
  border: 1px solid var(--warning-border);
  color: var(--warning);
  font-size: 0.71rem;
  font-weight: 600;
  padding: 0.16rem 0.5rem;
  border-radius: var(--radius-xs);
}

.question-stem {
  font-size: 0.96rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.85rem;
  line-height: 1.46;
}

.options-list {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.option-btn {
  width: 100%;
  text-align: left;
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.62rem 0.85rem;
  color: var(--text);
  font-size: 0.87rem;
  font-family: inherit;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.7rem;
  transition: background-color 0.12s ease, border-color 0.12s ease;
}

.option-btn:hover:not(:disabled):not(.locked) {
  border-color: var(--primary);
  background-color: var(--bg-elevated-hover);
}

.option-btn:disabled,
.option-btn.locked {
  cursor: default;
}

.option-btn:disabled:not(.correct):not(.incorrect):not(.selected),
.option-btn.locked:not(.correct):not(.incorrect):not(.selected) {
  opacity: 0.65;
}

.option-btn.locked:hover,
.option-btn:disabled:hover {
  background-color: var(--bg-elevated);
  border-color: var(--border);
}

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

.option-letter {
  width: 24px;
  height: 24px;
  border-radius: var(--radius-xs);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.75rem;
  flex-shrink: 0;
  color: var(--text-secondary);
}

.option-btn.selected {
  border-color: var(--primary);
  background-color: var(--primary-soft);
}

.option-btn.selected .option-letter {
  background-color: var(--primary);
  border-color: var(--primary);
  color: var(--on-primary);
}

.option-btn.correct {
  border-color: var(--success);
  background-color: var(--success-bg);
}

.option-btn.correct .option-letter {
  background-color: var(--success);
  border-color: var(--success);
  color: var(--on-primary);
}

.option-btn.incorrect {
  border-color: var(--danger);
  background-color: var(--danger-bg);
}

.option-btn.incorrect .option-letter {
  background-color: var(--danger);
  border-color: var(--danger);
  color: var(--on-primary);
}

.feedback-box {
  margin-top: 0.75rem;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.83rem;
}

.feedback-box.correct {
  background-color: var(--success-bg);
  border: 1px solid var(--success-border);
  color: var(--success);
}

.feedback-box.incorrect {
  background-color: var(--danger-bg);
  border: 1px solid var(--danger-border);
  color: var(--danger);
}

.hidden {
  display: none !important;
}

.player-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.player-footer.compact {
  margin-bottom: 0.35rem;
}

.question-navigator-panel {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
}

.question-navigator-panel.compact {
  background-color: var(--bg-card);
  padding: 0.7rem 0.85rem;
}

.navigator-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.65rem;
  margin-bottom: 0.55rem;
  flex-wrap: wrap;
}

.question-navigator-panel h4 {
  font-size: 0.73rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.navigator-legend {
  display: flex;
  gap: 0.65rem;
  font-size: 0.71rem;
  color: var(--text-muted);
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.28rem;
}

.dot-sample {
  width: 9px;
  height: 9px;
  border-radius: 2px;
  display: inline-block;
}

.dot-sample.current {
  border: 2px solid var(--primary);
}

.dot-sample.correct {
  background-color: var(--success);
}

.dot-sample.incorrect {
  background-color: var(--danger);
}

.navigator-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.32rem;
}

.nav-dot {
  width: 29px;
  height: 29px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border);
  background-color: var(--bg-card);
  color: var(--text-muted);
  font-size: 0.73rem;
  font-weight: 600;
  cursor: pointer;
  font-variant-numeric: tabular-nums;
  transition: border-color 0.12s ease, background-color 0.12s ease, color 0.12s ease;
}

.nav-dot:hover {
  border-color: var(--primary);
  color: var(--text);
  background-color: var(--bg-elevated);
}

.nav-dot.current {
  border-color: var(--primary);
  color: var(--text);
  background-color: var(--primary-soft);
}

.nav-dot.answered-correct {
  background-color: var(--success-bg);
  border-color: var(--success-border);
  color: var(--success);
}

.nav-dot.answered-incorrect {
  background-color: var(--danger-bg);
  border-color: var(--danger-border);
  color: var(--danger);
}

.nav-dot.answered-neutral {
  background-color: var(--bg-elevated);
  border-color: var(--primary-border);
  color: var(--text);
}

/* RESULTS & BROWSE */
.results-summary-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.35rem 1.15rem;
  text-align: center;
  margin-bottom: 1.35rem;
  box-shadow: var(--shadow-sm);
}

.results-mode-info {
  color: var(--text-muted);
  font-size: 0.82rem;
  margin-top: 0.18rem;
}

.results-score-circle {
  margin: 0.95rem auto;
}

.score-big {
  font-size: 2.35rem;
  font-weight: 700;
  color: var(--primary-hover);
  letter-spacing: -0.02em;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.score-sub {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

.results-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.9rem;
}

.filter-pills {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.pill {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-xs);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.12s ease, border-color 0.12s ease, color 0.12s ease;
}

.pill:hover {
  color: var(--text);
  background-color: var(--bg-elevated);
  border-color: var(--border-strong);
}

.pill.active {
  background-color: var(--primary-soft);
  color: var(--text);
  border-color: var(--primary);
  font-weight: 700;
}

.breakdown-list {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.breakdown-item {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 0.95rem;
}

.breakdown-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.45rem;
  flex-wrap: wrap;
}

.breakdown-options {
  margin-top: 0.55rem;
  display: grid;
  gap: 0.32rem;
}

.breakdown-opt {
  padding: 0.4rem 0.65rem;
  border-radius: var(--radius-xs);
  font-size: 0.83rem;
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

.breakdown-opt.is-correct {
  border-color: var(--success-border);
  background-color: var(--success-bg);
  color: var(--success);
  font-weight: 600;
}

.breakdown-opt.user-wrong {
  border-color: var(--danger-border);
  background-color: var(--danger-bg);
  color: var(--danger);
}

.review-note-banner {
  margin-top: 0.55rem;
  padding: 0.45rem 0.65rem;
  background-color: var(--warning-bg);
  border: 1px solid var(--warning-border);
  border-left: 3px solid var(--warning);
  color: var(--warning);
  font-size: 0.78rem;
  border-radius: var(--radius-xs);
}

.validation-summary-box {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  margin-bottom: 0.95rem;
  font-size: 0.83rem;
}

.browse-controls,
.form-grid {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.input-select,
.input-text,
.input-textarea {
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.42rem 0.7rem;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-family: inherit;
  transition: border-color var(--t-fast) var(--ease),
              box-shadow var(--t-fast) var(--ease);
}

.input-select:focus,
.input-text:focus,
.input-textarea:focus {
  outline: none;
  border-color: var(--accent-border);
  box-shadow: 0 0 0 3px rgba(201, 161, 95, 0.18);
}

.input-textarea {
  width: 100%;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.15rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  margin-bottom: 0.8rem;
  flex: 1;
  min-width: 220px;
}

.form-group label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.text-muted {
  color: var(--text-muted);
  font-size: 0.81rem;
}

/* RESPONSIVE & MOBILE OPTIMIZATION BREAKPOINTS */
@media (max-width: 860px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .app-sidebar {
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .sidebar-brand-bar {
    padding: 0.55rem 0.85rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .sidebar-group-label {
    display: none;
  }

  .sidebar-primary-nav {
    padding: 0.4rem 0.75rem;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.35rem;
  }

  .btn-nav {
    width: auto;
    padding: 0.34rem 0.6rem;
    font-size: 0.78rem;
  }

  .sidebar-subjects-section {
    padding: 0.45rem 0.75rem;
    gap: 0.25rem;
  }

  .sidebar-subjects-list {
    flex-direction: row;
    flex-wrap: nowrap;
    overflow-x: auto;
    gap: 0.35rem;
    padding-bottom: 0.2rem;
    -webkit-overflow-scrolling: touch;
  }

  .sidebar-subject-item {
    width: auto;
    flex-shrink: 0;
    padding: 0.35rem 0.6rem;
    font-size: 0.76rem;
    background-color: var(--bg-card);
    border-color: var(--border);
  }

  .sidebar-footer {
    padding: 0.4rem 0.75rem;
  }

  .app-topbar {
    padding: 0.45rem 0.85rem;
    gap: 0.5rem;
  }

  .topbar-creator-badge {
    order: 3;
    width: 100%;
    justify-content: center;
    font-size: 0.72rem;
    padding: 0.22rem 0.5rem;
    gap: 0.4rem;
  }
}

@media (max-width: 640px) {
  .container {
    padding: 0.65rem 0.65rem 1.75rem;
  }

  .app-topbar {
    padding: 0.4rem 0.65rem;
  }

  .topbar-context {
    font-size: 0.76rem;
  }

  .topbar-creator-badge {
    flex-wrap: wrap;
    font-size: 0.68rem;
    gap: 0.25rem;
    padding: 0.25rem 0.4rem;
    text-align: center;
  }

  .topbar-pill {
    font-size: 0.68rem;
    padding: 0.14rem 0.42rem;
  }

  .continue-banner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.85rem 1rem;
  }

  .continue-banner .btn {
    width: 100%;
  }

  .stats-overview-block {
    margin-top: 1.5rem;
    padding-top: 1rem;
  }


  .stats-compact-row .stat-card {
    padding: 0.75rem 0.85rem;
  }

  .stats-compact-row .stat-label {
    font-size: 0.62rem;
  }

  .stats-compact-row .stat-value {
    font-size: 1.15rem;
  }

  .section-header {
    margin-bottom: 0.65rem;
    gap: 0.45rem;
  }

  .section-title {
    font-size: 0.98rem;
  }

  .section-subtitle {
    font-size: 0.74rem;
  }

  .subjects-card-grid,
  .lectures-grid,
  .quizzes-grid,
  .sheets-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .subject-card {
    padding: 0.95rem 1rem;
    gap: 0.75rem;
  }

  .subject-card-title {
    font-size: 0.95rem;
  }

  .breadcrumb-bar {
    margin-bottom: 0.65rem;
    gap: 0.45rem;
  }

  .subject-hero-banner.compact {
    padding: 0.85rem 1rem;
    margin-bottom: 0.85rem;
    gap: 0.45rem;
  }

  .subject-hero-banner.compact .subject-hero-title {
    font-size: 1.05rem;
    margin: 0 0 0.15rem;
  }

  .subject-hero-banner.compact .subject-hero-meta {
    font-size: 0.75rem;
  }

  .subject-tabs-bar {
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    gap: 0.35rem;
    padding-bottom: 0.35rem;
    margin-bottom: 0.85rem;
  }

  .subject-tab-btn {
    flex-shrink: 0;
    padding: 0.45rem 0.8rem;
    font-size: 0.8rem;
    min-height: 38px;
  }

  .workspace-category-block {
    padding: 0.85rem 0.95rem;
    gap: 0.75rem;
  }

  .category-block-header {
    padding-bottom: 0.45rem;
    gap: 0.45rem;
  }

  .category-block-header .section-title {
    font-size: 0.92rem;
  }

  .lecture-card,
  .quiz-card,
  .sheet-card {
    padding: 0.65rem 0.72rem;
    gap: 0.5rem;
  }

  .lecture-card-title,
  .quiz-card-title {
    font-size: 0.86rem;
  }

  .quiz-stats-strip {
    padding: 0.32rem 0.4rem;
    gap: 0.25rem;
  }

  .quiz-stat-cell span {
    font-size: 0.57rem;
  }

  .quiz-stat-cell strong {
    font-size: 0.75rem;
  }

  .quiz-card-actions {
    grid-template-columns: 1fr 1fr;
    gap: 0.35rem;
  }

  .btn {
    padding: 0.4rem 0.68rem;
    font-size: 0.78rem;
  }

  .btn-sm {
    padding: 0.32rem 0.55rem;
    font-size: 0.73rem;
  }

  .lecture-sticky-bar {
    padding: 0.5rem 0.65rem;
    margin-bottom: 0.65rem;
    gap: 0.45rem;
  }

  .lecture-page-title {
    font-size: 0.88rem;
  }

  .lecture-summary-card,
  .lecture-quiz-section {
    padding: 0.75rem 0.75rem;
    margin-bottom: 0.85rem;
  }

  .lecture-summary-heading {
    font-size: 0.96rem;
  }

  .lecture-summary-reader {
    font-size: 0.84rem;
    line-height: 1.55;
  }

  .lecture-quiz-stats-strip {
    grid-template-columns: repeat(4, 1fr);
    width: 100%;
    padding: 0.35rem 0.45rem;
    gap: 0.3rem;
  }

  .question-card {
    padding: 0.75rem 0.8rem;
    margin-bottom: 0.65rem;
  }

  .question-stem {
    font-size: 0.88rem;
    margin-bottom: 0.65rem;
  }

  .option-btn {
    padding: 0.5rem 0.65rem;
    font-size: 0.82rem;
    gap: 0.5rem;
  }

  .player-footer {
    flex-direction: row;
    gap: 0.4rem;
  }

  .player-footer .btn {
    flex: 1;
  }
}

/* ==========================================================================
   PHASE 2, 3 & 4 STUDY TOOLS & MODALS (Bookmarks, Mistakes, Tricks, Checklist, Exam)
   ========================================================================== */

/* Lecture Tag Badge (Internal Only - Hidden from UI per Spec Section 6) */
.lecture-tag-badge {
  display: none !important;
}

/* Question Meta Bar Layout */
.question-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.meta-left,
.meta-right {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

/* Action Icon Buttons (Bookmark & Flag) */
.btn-icon-action {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  border-radius: var(--radius-xs);
  padding: 0.2rem 0.55rem;
  font-size: 0.73rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-icon-action:hover {
  border-color: var(--primary);
  color: var(--text);
  background-color: var(--bg-elevated-hover);
}

.btn-icon-action.active {
  background-color: var(--primary-soft);
  border-color: var(--primary-border);
  color: var(--primary);
}

.btn-icon-action.flagged {
  background-color: var(--warning-bg);
  border-color: var(--warning-border);
  color: var(--warning);
}

/* Question Navigator Flagged Dot */
.nav-dot.flagged {
  border-color: var(--warning) !important;
  position: relative;
}

.nav-dot.flagged::after {
  content: "";
  position: absolute;
  top: 1px;
  right: 1px;
  width: 6px;
  height: 6px;
  background-color: var(--warning);
  border-radius: 50%;
}

/* Subject Hero Actions */
.subject-hero-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 0.65rem;
}

/* Expandable Drawer (MCQ Tricks & Checklist) */
.subject-expandable-drawer {
  background-color: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem 1.1rem;
  margin-bottom: 1.2rem;
  animation: modalSlideIn 160ms var(--ease);
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.85rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.drawer-title-group {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.drawer-icon {
  font-size: 1.15rem;
}

.drawer-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  margin: 0;
}

.btn-drawer-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.05rem;
  cursor: pointer;
  padding: 0.2rem 0.4rem;
  border-radius: var(--radius-xs);
}

.btn-drawer-close:hover {
  color: var(--text);
  background-color: var(--bg-elevated);
}

/* Tricks Grid & Card */
.tricks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0.75rem;
}

.trick-card {
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent-bank);
  border-radius: var(--radius-xs);
  padding: 0.75rem 0.85rem;
}

.trick-card-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.35rem;
}

.trick-card-shortcut {
  font-size: 0.8rem;
  color: var(--text);
  line-height: 1.45;
  margin-bottom: 0.4rem;
}

.trick-card-meta {
  font-size: 0.74rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.trick-card-meta strong {
  color: var(--text);
}

/* Inline MCQ Trick inside Feedback Box */
.mcq-trick-card {
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent-bank);
  border-radius: var(--radius-xs);
  padding: 0.65rem 0.8rem;
  margin-top: 0.65rem;
  font-size: 0.82rem;
  line-height: 1.45;
}

.mcq-trick-card strong {
  color: var(--accent-bank);
}

/* Checklist Card & Items */
.checklist-fraction {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  background-color: var(--bg-elevated);
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border);
}

.checklist-add-bar {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.85rem;
}

.checklist-add-bar .input-text {
  flex: 1;
}

.checklist-items-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.checklist-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  padding: 0.45rem 0.65rem;
  font-size: 0.84rem;
  transition: all var(--transition-fast);
}

.checklist-item.completed {
  opacity: 0.65;
  text-decoration: line-through;
}

.checklist-item-left {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  cursor: pointer;
  flex: 1;
}

.btn-item-delete {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.85rem;
  padding: 0.1rem 0.3rem;
  border-radius: var(--radius-xs);
}

.btn-item-delete:hover {
  color: var(--danger);
  background-color: var(--danger-bg);
}

/* Empty State Card */
.empty-state-card {
  text-align: center;
  padding: 2.5rem 1.5rem;
  background-color: var(--card-bg);
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  margin-top: 1rem;
}

.empty-state-card .empty-icon {
  font-size: 2.2rem;
  display: block;
  margin-bottom: 0.5rem;
}

.empty-state-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.35rem;
}

.empty-state-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  max-width: 420px;
  margin: 0 auto;
}

/* Modal Dialog */
body.modal-open {
  overflow: hidden !important;
}

/* Modal Dialog */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1200;
  padding: 1.5rem;
  animation: modalFadeIn 160ms var(--ease);
}

.modal-card {
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  max-width: 480px;
  width: 100%;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
  overflow: hidden;
  animation: modalSlideIn 160ms var(--ease);
}

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

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

.modal-header h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  margin: 0;
}

.modal-body {
  padding: 1.5rem;
}

.modal-note-box {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-controls);
  padding: 0.75rem 0.9rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.45;
  margin-top: 1rem;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border);
  background-color: var(--bg-card);
}

/* ==========================================================================
   QUESTION BANK — COMPREHENSIVE VISUAL REDESIGN (SINGLE AMBER ACCENT)
   ========================================================================== */

/* 1. TYPOGRAPHY & RESET */
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, Helvetica, Arial, sans-serif;
  color: var(--text);
  background-color: var(--bg);
  line-height: 1.5;
}

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

/* 2. SIDEBAR NAVIGATION & BRANDING */
.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  user-select: none;
}
.brand-mark-svg {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease;
}
.brand:hover .brand-mark-svg {
  transform: scale(1.06);
}
.brand-title {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
}

.sidebar-primary-nav {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0.85rem 0.65rem;
}

.btn-nav {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-controls);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  cursor: pointer;
  text-align: left;
  transition: background-color var(--t-fast) var(--ease),
              color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease);
  position: relative;
}

.btn-nav .nav-icon {
  flex-shrink: 0;
  stroke: var(--text-muted);
  transition: stroke var(--t-fast) var(--ease);
}

@media (hover: hover) {
  .btn-nav:hover:not(.active) {
    background-color: rgba(201, 161, 95, 0.08);
    color: var(--text);
  }
  .btn-nav:hover:not(.active) .nav-icon {
    stroke: var(--accent-text);
  }
}

.btn-nav.active {
  background-color: var(--accent-tint) !important;
  color: var(--accent-text) !important;
  border: 1px solid var(--accent-border) !important;
  border-left: 3px solid var(--accent) !important;
  border-radius: 0 var(--radius-controls) var(--radius-controls) 0;
}
.btn-nav.active .nav-icon {
  stroke: var(--accent-text) !important;
}

.sidebar-subject-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.45rem 0.65rem;
  border-radius: var(--radius-controls);
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  width: 100%;
  text-align: left;
  transition: background-color var(--t-fast) var(--ease),
              color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease);
}
@media (hover: hover) {
  .sidebar-subject-item:hover:not(.active) {
    background-color: rgba(201, 161, 95, 0.08);
    color: var(--text);
  }
}
.sidebar-subject-item.active {
  background-color: var(--accent-tint);
  color: var(--accent-text);
  border: 1px solid var(--accent-border);
  font-weight: 600;
}
.sidebar-subject-counts {
  font-size: 0.72rem;
  color: var(--text-muted);
  background-color: var(--bg-elevated);
  padding: 0.12rem 0.4rem;
  border-radius: 4px;
  border: 1px solid var(--border-subtle);
  flex-shrink: 0;
}

/* 2B. TOP ANNOUNCEMENT / BRANDING STRIP (28px height, 12px text) */
.top-announcement-strip {
  height: 28px;
  min-height: 28px;
  background-color: var(--bg-sidebar);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 12px;
  color: var(--text-muted);
  width: 100%;
  padding: 0 1rem;
  box-sizing: border-box;
}
.top-announcement-strip a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.15s ease;
}
.top-announcement-strip a:hover {
  color: var(--accent-text);
}
.top-announcement-strip .strip-sep {
  opacity: 0.45;
}

/* 3. TOPBAR */
.app-topbar {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem 0.85rem;
  padding: 0.75rem 2rem;
  background-color: var(--bg);
  border-bottom: 1px solid var(--border);
  min-height: 52px;
  box-sizing: border-box;
}
.topbar-context {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  min-width: 0;
}

.topbar-creator-capsule {
  position: static;
  transform: none;
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.55rem;
  background-color: #1A1D21;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  padding: 0.3rem 0.8rem;
  font-size: 0.76rem;
  color: var(--text-secondary);
  max-width: 100%;
}

@media (max-width: 992px) {
  .topbar-creator-capsule {
    position: static;
    transform: none;
    margin: 0.25rem 0;
  }
}

.creator-badge-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  text-decoration: none;
  font-weight: 700;
  border-radius: 6px;
  padding: 0.18rem 0.55rem;
  font-size: 0.76rem;
  transition: opacity 0.15s ease;
}
.creator-badge-btn:hover { opacity: 0.85; }

.domain-btn {
  background-color: #242930;
  color: #F3F4F6 !important;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.tg-btn {
  background-color: rgba(56, 189, 248, 0.15);
  color: #38BDF8 !important;
  border: 1px solid rgba(56, 189, 248, 0.35);
}

.creator-badge-sig {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-style: italic;
  font-weight: 600;
  color: #E5A93C;
}

.capsule-divider {
  color: rgba(255, 255, 255, 0.25);
  font-size: 0.8rem;
}

.creator-badge-feedback {
  color: var(--text-muted);
  font-size: 0.76rem;
}

/* 4. DASHBOARD & HERO */
.dashboard-header {
  margin-bottom: 1.25rem;
}
.dashboard-hero-title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

/* 4. DASHBOARD STATS ROW (CONTAINER + 4 BOXES) */
.stats-compact-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  width: 100%;
  box-sizing: border-box;
  background-color: var(--card, var(--bg-card));
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 24px;
}

.stat-card {
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  background-color: var(--bg-elevated) !important;
  border: 1px solid var(--border) !important;
  border-radius: 10px !important;
  padding: 14px 16px !important;
  text-align: left;
  box-sizing: border-box;
  gap: 4px;
  box-shadow: none !important;
}

.stat-card::before {
  content: "" !important;
  display: block !important;
  position: absolute;
  top: 0;
  left: 16px;
  width: 24px;
  height: 3px;
  background-color: var(--accent);
  border-radius: 999px;
}

.stat-card::after {
  display: none !important;
  content: none !important;
}

.stat-card:hover {
  transform: none !important;
  box-shadow: none !important;
}

.stat-card .stat-label {
  font-size: 11px;
  font-weight: 500;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 2px;
  line-height: 1.4;
}

.stat-card .stat-value {
  font-size: 26px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.2;
  text-align: left;
}

.stat-card .stat-value.highlight {
  color: var(--text);
  font-size: 26px;
  font-weight: 700;
}

@media (max-width: 640px) {
  .stats-compact-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    padding: 12px;
  }
  .stat-card {
    padding: 12px 14px !important;
  }
}

.dashboard-controls-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}
.dashboard-search-box {
  position: relative;
  flex: 1;
  min-width: 240px;
  max-width: 420px;
}
.dashboard-search-box .search-icon {
  position: absolute;
  left: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}
.subject-search-input {
  width: 100%;
  padding: 0.55rem 0.85rem 0.55rem 2.4rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-controls);
  color: var(--text);
  font-size: 0.88rem;
  transition: border-color var(--t-fast) var(--ease),
              box-shadow var(--t-fast) var(--ease);
}
.subject-search-input:focus {
  border-color: var(--accent-border);
  box-shadow: 0 0 0 3px rgba(201, 161, 95, 0.18);
  outline: none;
}

.filter-pills {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.filter-pills .pill {
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-controls);
  border: 1px solid var(--border);
  background-color: var(--bg-card);
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
.filter-pills .pill:hover {
  background-color: var(--bg-elevated);
  border-color: var(--accent-border);
  color: var(--text);
}
.filter-pills .pill.active {
  background-color: var(--accent-tint);
  color: var(--accent-text);
  border: 1px solid var(--accent-border);
  font-weight: 600;
}

/* 5. CONTINUE WHERE YOU LEFT OFF */
.continue-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-card);
  padding: 0.9rem 1.25rem;
  margin-bottom: 1.5rem;
  transition: transform var(--t-base) var(--ease),
              background-color var(--t-base) var(--ease),
              border-color var(--t-base) var(--ease),
              box-shadow var(--t-base) var(--ease);
}
@media (hover: hover) {
  .continue-banner:hover {
    background-color: var(--bg-card-hover);
    border-color: var(--accent-border);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.25);
    transform: translateY(-2px);
  }
}
.continue-info {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.continue-label {
  font-size: 0.74rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--accent-text);
}
.continue-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
}

/* 6. SUBJECT CARDS (SURFACE TONE STEP, NO GLOW, 10PX RADIUS) */
.subjects-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.subject-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  cursor: pointer;
  transition: transform var(--t-base) var(--ease),
              background-color var(--t-base) var(--ease),
              border-color var(--t-base) var(--ease),
              box-shadow var(--t-base) var(--ease);
  position: relative;
  text-align: left;
}

.subject-card:hover {
  border-color: var(--amber-primary, #E5A93C) !important;
}

/* Hover: slightly lighter surface + amber highlight border, no stuck border */
@media (hover: hover) {
  .subject-card:hover {
    background-color: var(--bg-card-hover);
    border-color: var(--amber-primary, #E5A93C) !important;
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.25);
    transform: translateY(-2px);
  }
}

.subject-card-head {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
}
.subject-card-icon-box {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-controls);
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--accent-text);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.subject-card-title-group {
  flex: 1;
  min-width: 0;
}
.subject-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.3;
}
.subject-card-subline {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

.subject-status-pill {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-controls);
  border: 1px solid var(--border);
  flex-shrink: 0;
}
.subject-status-pill.in-progress {
  background-color: var(--accent-tint);
  color: var(--accent-text);
  border-color: var(--accent-border);
}
.subject-status-pill.reviewing {
  background-color: rgba(74, 222, 128, 0.12);
  color: #86EFAC;
  border-color: rgba(74, 222, 128, 0.3);
}

.subject-card-metric-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-top: 0.25rem;
}
.subject-completion-huge {
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
}
.subject-not-started {
  font-size: 0.84rem;
  color: var(--text-muted);
  font-weight: 500;
}
.subject-last-active {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.subject-card-progress {
  margin-top: 0.15rem;
}
.subject-progress-track {
  width: 100%;
  height: 4px;
  background-color: var(--border);
  border-radius: 999px;
  overflow: hidden;
}
.subject-progress-fill {
  height: 100%;
  background-color: var(--accent);
  opacity: 1;
  border-radius: 999px;
  transition: width var(--t-base) var(--ease);
}

/* 8. TOAST NOTIFICATION */
.app-toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background-color: var(--bg-elevated);
  color: var(--text);
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-controls);
  padding: 0.75rem 1.25rem;
  font-size: 0.88rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
  z-index: 2000;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  animation: toastIn 0.2s ease-out;
  transition: opacity 0.25s ease, transform 0.25s ease;
}
@keyframes toastIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 7. SUBJECT PAGE CARDS (LECTURES, QUIZZES, SHEETS) */
.lecture-card,
.quiz-card,
.sheet-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 1.15rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.lecture-card:hover,
.quiz-card:hover,
.sheet-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}

.lecture-card-tag {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.lecture-card-title,
.quiz-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  margin-top: 0.15rem;
}
.lecture-card-qcount,
.quiz-card-qcount {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.quiz-card-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 0.35rem;
  flex-wrap: wrap;
}
.quiz-start-group {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.order-segmented-toggle {
  display: inline-flex;
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2px;
}
.order-seg-btn {
  background: transparent;
  border: none;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 0.25rem 0.55rem;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}
.order-seg-btn.active {
  background-color: var(--bg-card);
  color: var(--text);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.15);
}

.btn-text {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.82rem;
  cursor: pointer;
  text-decoration: underline;
  padding: 0.2rem 0.4rem;
}
.btn-text:hover {
  color: var(--text);
}

/* 8. QUIZ PLAYER (TWO-COLUMN MOCKUP LAYOUT) */
.quiz-player-layout {
  display: grid;
  grid-template-columns: 1fr 310px;
  gap: 1.5rem;
  align-items: start;
  margin-top: 1.25rem;
}
.quiz-player-main {
  max-width: 860px;
  width: 100%;
}
.quiz-player-sidebar {
  position: sticky;
  top: 1rem;
}

.question-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 1.2rem 1.35rem;
}

.question-stem {
  font-size: 1.02rem !important;
  line-height: 1.52 !important;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.9rem !important;
}

.options-list {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.option-btn {
  min-height: unset;
  padding: 0.62rem 0.85rem !important;
  border-radius: 9px !important;
  font-size: 0.88rem !important;
  border: 1.5px solid var(--border);
  background-color: var(--bg-elevated);
  display: flex;
  align-items: center;
  gap: 0.65rem !important;
  margin-bottom: 0.45rem !important;
  line-height: 1.4 !important;
  text-align: left;
  cursor: pointer;
  color: var(--text);
  transition: border-color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
  width: 100%;
}
@media (hover: hover) {
  .option-btn:hover:not(.locked):not(:disabled) {
    border-color: var(--accent-border);
    background-color: var(--bg-card-hover);
    transform: none;
  }
}

.option-letter {
  width: 24px !important;
  height: 24px !important;
  min-width: 24px !important;
  border-radius: 6px !important;
  border: 1.5px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.76rem !important;
  font-weight: 700;
  flex-shrink: 0;
  background-color: var(--bg-card);
}

.option-text {
  flex: 1;
  font-size: 0.88rem !important;
  line-height: 1.38 !important;
  font-weight: 500;
}

.option-btn.selected {
  border-color: var(--primary) !important;
  background-color: var(--primary-soft) !important;
}

.option-btn.correct {
  border-color: var(--success) !important;
  background-color: var(--success-bg) !important;
}

.option-btn.incorrect {
  border-color: var(--danger) !important;
  background-color: var(--danger-bg) !important;
}

.option-indicator-icon {
  font-size: 1.15rem;
  font-weight: 800;
  margin-left: auto;
  flex-shrink: 0;
}
.option-indicator-icon.correct {
  color: var(--success);
}
.option-indicator-icon.incorrect {
  color: var(--danger);
}

.player-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1.25rem;
  flex-wrap: wrap;
}

.question-navigator-panel {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 1.25rem;
}
.question-navigator-panel h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.75rem;
}

.navigator-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}
.legend-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
.dot-sample {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  display: inline-block;
}
.dot-sample.current {
  background-color: var(--primary);
}
.dot-sample.correct {
  background-color: var(--success);
}
.dot-sample.incorrect {
  background-color: var(--danger);
}
.dot-sample.flagged {
  background-color: var(--warning);
}

.navigator-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.5rem;
}
.nav-dot {
  width: 100%;
  aspect-ratio: 1;
  min-height: 38px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background-color: var(--bg-elevated);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
@media (hover: hover) {
  .nav-dot:hover:not(.current) {
    background-color: var(--bg-card-hover);
    border-color: var(--accent-border);
    color: var(--text);
  }
}
.nav-dot.current {
  border-color: var(--primary) !important;
  color: var(--primary) !important;
  background-color: var(--primary-soft) !important;
}
.nav-dot.answered-correct {
  background-color: var(--success-bg) !important;
  border-color: var(--success) !important;
  color: var(--success) !important;
}
.nav-dot.answered-incorrect {
  background-color: var(--danger-bg) !important;
  border-color: var(--danger) !important;
  color: var(--danger) !important;
}
.nav-dot.flagged {
  border-color: var(--warning) !important;
  color: var(--warning) !important;
}



/* 10. MOBILE BOTTOM NAVIGATION (<= 768px) */
.mobile-bottom-bar {
  display: none;
}

@media (max-width: 768px) {
  .app-sidebar {
    display: none !important;
  }
  .app-content-area {
    margin-left: 0 !important;
    padding-bottom: 74px !important;
  }
  .app-topbar {
    padding: 0.65rem 1rem;
    min-height: 48px;
  }
  .container {
    padding: 1rem !important;
  }
  .subjects-card-grid {
    grid-template-columns: 1fr;
  }
  .quiz-player-layout {
    grid-template-columns: 1fr;
  }
  .quiz-player-sidebar {
    position: static;
    order: 2;
  }
  .touch-target,
  .btn,
  .pill,
  .option-btn {
    min-height: 44px;
  }
  .mobile-bottom-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 58px;
    background-color: var(--bg-card);
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-around;
    z-index: 1000;
  }
  .mobile-tab-btn {
    flex: 1;
    height: 100%;
    min-height: 44px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.2rem;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.7rem;
    font-weight: 600;
    cursor: pointer;
  }
  .mobile-tab-btn.active {
    color: var(--primary);
  }
  .mobile-tab-btn svg {
    stroke: currentColor;
  }
}

/* ARROWS & ICONS MOTION */
.arrow,
.arrow-glyph,
.subject-card-arrow,
.btn .arrow-glyph,
.btn .arrow,
.card .arrow-glyph,
.subject-card .arrow-glyph {
  display: inline-block;
  transition: transform var(--t-fast) var(--ease);
}

@media (hover: hover) {
  .btn:hover:not(:disabled) .arrow,
  .btn:hover:not(:disabled) .arrow-glyph,
  .card:hover .arrow,
  .card:hover .arrow-glyph,
  .subject-card:hover .arrow,
  .subject-card:hover .arrow-glyph,
  .subject-card:hover .subject-card-arrow,
  .continue-banner:hover .arrow,
  .continue-banner:hover .arrow-glyph {
    transform: translateX(3px);
  }
}

/* 11. REDUCED MOTION */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
    transform: none !important;
  }
}


/* Enhanced Topbar Creator Badge Capsule */
.topbar-creator-badge {
  display: inline-flex !important;
  align-items: center !important;
  gap: 0.65rem !important;
  font-size: 0.78rem !important;
  background-color: var(--bg-card) !important;
  border: 1px solid var(--border) !important;
  border-radius: 999px !important;
  padding: 0.35rem 0.95rem !important;
  color: var(--text-secondary) !important;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.18);
}

.creator-website-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--text) !important;
  font-weight: 700 !important;
  text-decoration: none;
  padding: 0.2rem 0.6rem;
  border-radius: 6px;
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  transition: color 0.15s ease, border-color 0.15s ease;
}
.creator-website-link:hover {
  color: var(--primary) !important;
  border-color: var(--primary);
}

.creator-signature {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-style: italic;
  font-weight: 600;
  color: #E5A93C !important;
}

.creator-feedback {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--text-muted);
}

.creator-tg-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  color: #38BDF8 !important;
  font-weight: 700 !important;
  text-decoration: none;
  padding: 0.2rem 0.55rem;
  border-radius: 6px;
  background-color: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.28);
}
.creator-tg-link:hover {
  background-color: rgba(56, 189, 248, 0.25);
}

/* ==========================================================================
   PART 1: UNIFORM QUESTION CARD & OPTIONS WIDTH
   ========================================================================== */

/* 1. Flex container alignment for all question list containers */
.lecture-questions-list,
#lecQuestionsContainer,
.browse-questions-list,
#browseQuestionsList,
.bookmarks-list,
#bookmarksList,
.mistakes-list,
#mistakesList {
  display: flex !important;
  flex-direction: column !important;
  align-items: stretch !important;
  width: 100% !important;
  gap: 0.9rem !important;
}

/* 2. Strictly uniform, equal card sizing across all questions */
.question-card,
.question-card.lecture-q-card,
.browse-question-card,
.mistake-card,
.bookmark-card,
.breakdown-item,
.question-review-card,
div[id^="lec-qcard-"] {
  width: 100% !important;
  min-width: 100% !important;
  max-width: 100% !important;
  align-self: stretch !important;
  margin-left: 0 !important;
  margin-right: 0 !important;
  margin-bottom: 0 !important;
  box-sizing: border-box !important;
}

/* 3. Fully stretched options list and buttons */
.options-list,
.option-btn {
  width: 100% !important;
  box-sizing: border-box !important;
}

.option-btn {
  padding: 0.62rem 0.85rem !important;
  border-radius: 9px !important;
  font-size: 0.88rem !important;
  gap: 0.65rem !important;
  margin-bottom: 0.45rem !important;
  line-height: 1.4 !important;
}

.option-letter {
  width: 24px !important;
  height: 24px !important;
  min-width: 24px !important;
  font-size: 0.76rem !important;
  border-radius: 6px !important;
}

.option-text {
  font-size: 0.88rem !important;
  line-height: 1.38 !important;
}

.question-stem {
  font-size: 1.02rem !important;
  line-height: 1.52 !important;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.9rem !important;
}

/* ==========================================================================
   PART 2: NATURAL SPREAD FOR LECTURE SUMMARY & EXPLANATIONS
   ========================================================================== */

#lectureStudyView,
.lecture-summary-card,
.lecture-sticky-bar,
.lecture-quiz-section,
.lecture-summary-reader,
.lecture-doc,
.lecture-study-layout,
.lecture-quiz-area {
  width: 100% !important;
  max-width: 100% !important;
  margin-left: 0 !important;
  margin-right: 0 !important;
  box-sizing: border-box !important;
}

.lecture-summary-reader {
  font-size: 0.92rem !important;
  line-height: 1.65 !important;
  color: var(--text) !important;
}

.lecture-doc h2 {
  font-size: 1.06rem !important;
  font-weight: 700 !important;
}

.lecture-doc p,
.lecture-doc li {
  font-size: 0.90rem !important;
  line-height: 1.62 !important;
}

.bilingual-block.arabic-block,
.bilingual-block {
  font-size: 0.90rem !important;
  line-height: 1.7 !important;
  padding: 0.65rem 0.95rem !important;
}

.table-wrap {
  width: 100% !important;
  overflow-x: auto !important;
  -webkit-overflow-scrolling: touch !important;
}

/* ==========================================================================
   PART 3: MOBILE OPTIMIZATION (< 768px)
   ========================================================================== */

@media (max-width: 768px) {
  /* 1. Topbar Capsule: single line centered in .app-topbar without horizontal scroll */
  .app-topbar {
    position: static !important;
    padding: 0.45rem 0.75rem !important;
    gap: 0.35rem !important;
    flex-wrap: wrap !important;
  }

  .topbar-creator-capsule {
    position: static !important;
    transform: none !important;
    width: 100% !important;
    max-width: 100% !important;
    display: inline-flex !important;
    flex-wrap: nowrap !important;
    align-items: center !important;
    justify-content: center !important;
    padding: 0.22rem 0.5rem !important;
    font-size: 0.72rem !important;
    gap: 0.35rem !important;
    margin: 0.2rem 0 !important;
    border-radius: 8px !important;
    box-sizing: border-box !important;
    overflow: hidden !important;
  }

  /* Hide wordy feedback label on mobile so only links and handle remain */
  .creator-badge-feedback {
    display: none !important;
  }

  .creator-badge-btn {
    padding: 0.15rem 0.45rem !important;
    font-size: 0.72rem !important;
    white-space: nowrap !important;
    flex-shrink: 0 !important;
  }

  .creator-badge-sig {
    white-space: nowrap !important;
    flex-shrink: 0 !important;
  }

  .capsule-divider {
    flex-shrink: 0 !important;
  }

  /* 2. Mobile Question Cards & Options */
  .question-card,
  .question-card.lecture-q-card,
  .browse-question-card,
  .mistake-card,
  .bookmark-card,
  .breakdown-item,
  .question-review-card,
  div[id^="lec-qcard-"] {
    padding: 0.85rem 0.85rem !important;
  }

  .question-stem {
    font-size: 0.92rem !important;
    line-height: 1.45 !important;
    margin-bottom: 0.65rem !important;
  }

  .option-btn {
    padding: 0.5rem 0.65rem !important;
    font-size: 0.82rem !important;
    min-height: 38px !important;
    border-radius: 8px !important;
    gap: 0.5rem !important;
    margin-bottom: 0.35rem !important;
  }

  .option-letter {
    width: 22px !important;
    height: 22px !important;
    min-width: 22px !important;
    font-size: 0.72rem !important;
  }

  .option-text {
    font-size: 0.82rem !important;
  }

  .subject-card {
    padding: 0.9rem !important;
    gap: 0.65rem !important;
    border-radius: 10px !important;
  }
}


/* ==========================================================================
   PART 4: CONTINUE BANNER, COMPLETED STATUS PILL & MOBILE POLISH
   ========================================================================== */

.continue-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1.15rem;
  margin-bottom: 1.25rem;
  box-sizing: border-box;
}

.continue-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.btn-dismiss-continue {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.4rem;
  font-size: 0.9rem;
  line-height: 1;
  border-radius: 4px;
}

.btn-dismiss-continue:hover {
  color: var(--text);
  background-color: var(--bg-secondary);
}

.subject-status-pill.completed {
  background-color: var(--success-bg);
  border: 1px solid var(--success-border);
  color: var(--success);
  font-weight: 600;
}

@media (max-width: 768px) {
  body {
    padding-bottom: 74px !important;
  }

  .app-main-layout,
  .container,
  .view {
    padding-bottom: 84px !important;
  }

  #dashboardView .dashboard-header,
  #browseView > .section-header > div:first-child {
    display: none !important;
  }

  .continue-banner {
    flex-direction: column !important;
    align-items: stretch !important;
    gap: 0.65rem !important;
    padding: 0.85rem 0.95rem !important;
    width: 100% !important;
  }

  .continue-info {
    width: 100% !important;
  }

  .continue-title {
    font-size: 0.90rem !important;
    line-height: 1.4 !important;
    word-break: break-word !important;
    white-space: normal !important;
  }

  .continue-actions {
    width: 100% !important;
    display: flex !important;
    justify-content: space-between !important;
  }

  .continue-actions .btn {
    flex: 1 !important;
    justify-content: center !important;
  }

  .option-btn {
    padding: 0.52rem 0.7rem !important;
    font-size: 0.84rem !important;
    min-height: 40px !important;
    border-radius: 8px !important;
    margin-bottom: 0.4rem !important;
  }

  .option-letter {
    width: 22px !important;
    height: 22px !important;
    min-width: 22px !important;
    font-size: 0.72rem !important;
  }
}

/* ==========================================================================
   PHASE 4-9: CONTENT MANAGEMENT, MISTAKES ACTIONS & VISUALIZATIONS
   Uses the existing palette/tokens and layout language.
   ========================================================================== */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.badge-warning {
  background-color: var(--warning-bg);
  color: var(--warning);
  border: 1px solid var(--warning-border);
}

.empty-inline {
  padding: 1rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.55;
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}

.content-panel {
  padding: 1.1rem 1.15rem;
  margin-bottom: 1rem;
}

.content-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 0.9rem;
}

.content-panel-head h3 {
  font-size: 1.02rem;
  font-weight: 650;
  color: var(--text);
}

.content-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.content-term-note {
  margin-top: 0.75rem;
  font-size: 0.82rem;
  line-height: 1.5;
}

.content-health-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.5rem;
  margin-bottom: 0.85rem;
}

.content-health-grid > div {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.6rem;
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.content-health-grid strong {
  font-size: 1.05rem;
  color: var(--text);
}

.content-health-grid span {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.content-integrity-details {
  margin-top: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.content-issue-list {
  margin: 0.5rem 0 0 1rem;
  line-height: 1.7;
}

.content-subjects-list {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.content-subject-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.9rem;
  flex-wrap: wrap;
  border: 1px solid var(--border-subtle);
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.8rem;
}

.content-subject-title {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.content-subject-title strong {
  color: var(--text);
  font-size: 0.92rem;
}

.content-subject-meta {
  margin-top: 0.25rem;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.content-subject-actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.content-update-banner {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  background: var(--warning-bg);
  border: 1px solid var(--warning-border);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.85rem;
  margin-bottom: 1rem;
  font-size: 0.86rem;
}

.content-update-chip {
  display: inline-flex;
  align-items: center;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  padding: 0.1rem 0.4rem;
  font-size: 0.76rem;
  color: var(--text-secondary);
}

.import-preview {
  margin-top: 0.9rem;
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  padding: 0.85rem 0.9rem;
}

.import-preview-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}

.import-preview-stats {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.import-issue-list {
  margin: 0.4rem 0 0.6rem 1rem;
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.import-packages-list {
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.import-package-card {
  border: 1px solid var(--border-subtle);
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.8rem;
}

.import-package-head {
  display: flex;
  justify-content: space-between;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-bottom: 0.45rem;
  font-size: 0.86rem;
}

.import-version-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.import-version-list li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.mistake-actions {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.mistake-meta-line {
  font-size: 0.76rem;
  color: var(--text-muted);
  border-top: 1px dashed var(--border);
  padding-top: 0.4rem;
}

/* Visualization gallery */
.viz-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0.9rem;
  margin-bottom: 1.1rem;
}

.viz-card {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 1rem;
  transition: border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}

.viz-card:hover {
  border-color: var(--border-strong);
  background: var(--bg-card-hover);
}

.viz-card-badges {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.viz-card-title {
  font-size: 1.02rem;
  color: var(--text);
}

.viz-card-description {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.55;
  flex: 1;
}

.viz-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  flex-wrap: wrap;
  font-size: 0.78rem;
}

.viz-stage-wrap {
  margin-bottom: 1.2rem;
}

.viz-stage-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.7rem;
}

.viz-stage {
  outline: none;
}

.viz-shell {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 1.1rem;
}

.viz-shell:focus-within {
  border-color: var(--accent-border);
}

.viz-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.9rem;
}

.viz-badges {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
  margin-bottom: 0.35rem;
}

.viz-title {
  font-size: 1.15rem;
  color: var(--text);
}

.viz-description {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 0.2rem;
  max-width: 70ch;
}

.viz-actions {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.viz-body {
  border-top: 1px solid var(--border-subtle);
  padding-top: 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.viz-controls {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: flex-end;
}

.viz-control-group {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.viz-control-label {
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin-right: 0.2rem;
}

.viz-field {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.viz-chip {
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text-secondary);
  border-radius: var(--radius-controls);
  padding: 0.28rem 0.55rem;
  font-size: 0.8rem;
  cursor: pointer;
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.viz-chip:hover {
  background: var(--bg-elevated-hover);
  border-color: var(--border-strong);
}

.viz-chip.active {
  background: var(--accent-tint);
  border-color: var(--accent-border);
  color: var(--text);
}

.viz-chip-operator {
  color: var(--accent-text);
}

.viz-chip-danger {
  color: var(--danger);
  border-color: var(--danger-border);
}

.viz-input-toggle {
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text-secondary);
  border-radius: var(--radius-controls);
  padding: 0.3rem 0.6rem;
  font-family: var(--font-mono, "SFMono-Regular", Consolas, monospace);
  font-size: 0.82rem;
  cursor: pointer;
}

.viz-input-toggle.is-on {
  color: var(--accent-text);
  border-color: var(--accent-border);
  background: var(--accent-tint);
}

.viz-gate-display {
  background: var(--bg-deep-contrast);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 1rem;
  overflow-x: auto;
}

.viz-signal-row {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  min-width: max-content;
}

.viz-signal,
.viz-output {
  font-family: var(--font-mono, "SFMono-Regular", Consolas, monospace);
  font-size: 0.82rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  padding: 0.25rem 0.5rem;
  color: var(--text-muted);
  background: var(--bg-secondary);
}

.viz-signal.on,
.viz-output.on {
  color: var(--success);
  border-color: var(--success-border);
  background: var(--success-bg);
}

.viz-gate-symbol {
  font-family: var(--font-mono, "SFMono-Regular", Consolas, monospace);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--accent-text);
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.7rem;
  background: var(--accent-tint);
}

.viz-wire {
  width: 26px;
  height: 2px;
  background: var(--border-strong);
  display: inline-block;
}

.viz-summary {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.7;
  display: grid;
  gap: 0.15rem;
}

.viz-summary code,
.viz-help code {
  font-family: var(--font-mono, "SFMono-Regular", Consolas, monospace);
  font-size: 0.82rem;
  color: var(--accent-text);
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  padding: 0.05rem 0.3rem;
}

.viz-expression-result {
  color: var(--success) !important;
}

.viz-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  background: var(--bg-secondary);
}

.viz-table caption {
  caption-side: top;
  text-align: left;
  font-size: 0.78rem;
  color: var(--text-muted);
  padding-bottom: 0.4rem;
}

.viz-table th,
.viz-table td {
  border: 1px solid var(--border-subtle);
  padding: 0.35rem 0.5rem;
  text-align: center;
}

.viz-table thead th {
  background: var(--bg-elevated);
  color: var(--text-secondary);
  font-weight: 600;
}

.viz-table tbody tr:nth-child(even) {
  background: var(--table-stripe);
}

.viz-table .viz-value-one,
.viz-value-one {
  color: var(--success);
  font-weight: 700;
}

.viz-help {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.55;
}

.viz-expression-display {
  background: var(--bg-deep-contrast);
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.85rem;
  min-height: 2.6rem;
  font-size: 0.92rem;
  color: var(--accent-text);
  display: flex;
  align-items: center;
}

.viz-token-palette {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.viz-conversion-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.6rem;
}

.viz-conversion-cell {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.7rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.viz-conversion-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

.viz-conversion-value {
  font-family: var(--font-mono, "SFMono-Regular", Consolas, monospace);
  font-size: 0.95rem;
  color: var(--accent-text);
  word-break: break-all;
}

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

.viz-kmap td {
  padding: 0.2rem;
}

.viz-kmap-corner {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.viz-kmap-cell {
  width: 100%;
  min-width: 54px;
  min-height: 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.1rem;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  background: var(--bg-elevated);
  color: var(--text-muted);
  cursor: pointer;
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.viz-kmap-cell:hover {
  border-color: var(--border-strong);
}

.viz-kmap-cell.on {
  background: var(--success-bg);
  border-color: var(--success-border);
  color: var(--text);
}

.viz-kmap-index {
  font-size: 0.62rem;
  opacity: 0.65;
}

.viz-kmap-value {
  font-size: 0.95rem;
  font-weight: 700;
}

.viz-group-list {
  margin-left: 1rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.viz-explanation {
  margin-top: 1rem;
  border-top: 1px solid var(--border-subtle);
  padding-top: 0.8rem;
  font-size: 0.83rem;
  color: var(--text-secondary);
  line-height: 1.65;
  display: grid;
  gap: 0.4rem;
}

.viz-explanation-ar {
  direction: rtl;
  text-align: right;
  color: var(--text-secondary);
  border-top: 1px dashed var(--border-subtle);
  padding-top: 0.5rem;
  font-size: 0.86rem;
}

.viz-loading {
  padding: 1.5rem;
  text-align: center;
}

.viz-planned-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.viz-planned-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  flex-wrap: wrap;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.7rem;
  font-size: 0.82rem;
  background: var(--bg-secondary);
}

/* Keyboard focus consistency (existing theme accents) */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

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

@media (max-width: 860px) {
  .content-health-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .viz-shell {
    padding: 0.9rem;
  }

  .viz-header {
    flex-direction: column;
    align-items: stretch;
  }

  .viz-actions {
    justify-content: flex-end;
  }
}

@media (max-width: 640px) {
  .content-subject-row {
    flex-direction: column;
    align-items: stretch;
  }

  .content-subject-actions {
    justify-content: flex-start;
  }

  .content-actions {
    width: 100%;
  }

  .viz-cards-grid {
    grid-template-columns: 1fr;
  }

  .viz-controls {
    flex-direction: column;
    align-items: stretch;
    gap: 0.6rem;
  }

  .viz-gate-display {
    padding: 0.7rem;
  }

  .viz-table {
    font-size: 0.76rem;
  }

  .viz-kmap-cell {
    min-width: 44px;
    min-height: 42px;
  }
}

/* ==========================================================================
   FACULTY AI — ADMIN, PDFs, VIDEOS, SUBJECT VISUALIZATIONS
   ========================================================================== */

.topbar-context-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
  margin-right: 0.75rem;
}

.faculty-term-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border-radius: 999px;
  padding: 0.28rem 0.65rem;
  font-size: 0.78rem;
  cursor: pointer;
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.faculty-term-btn:hover {
  border-color: var(--accent-border);
  color: var(--text);
}

.faculty-term-caret {
  font-size: 0.7rem;
  opacity: 0.75;
}

.admin-access-btn {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  padding: 0.28rem 0.6rem;
  font-size: 0.76rem;
  cursor: pointer;
}

.admin-access-btn:hover {
  color: var(--accent-text);
  border-color: var(--accent-border);
}

.admin-access-btn.is-authenticated {
  color: var(--success);
  border-color: var(--success-border);
  background: var(--success-bg);
}

.admin-security-note {
  font-size: 0.8rem;
  line-height: 1.5;
  margin-bottom: 0.8rem;
}

.admin-library-list {
  margin-top: 0.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.admin-library-group h4 {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin: 0.4rem 0 0.25rem;
}

.admin-library-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  flex-wrap: wrap;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.45rem 0.6rem;
  font-size: 0.82rem;
  background: var(--bg-secondary);
}

.pdfs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 0.8rem;
}

.pdf-card {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 0.8rem;
}

.pdf-card-icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: var(--danger-bg);
  border: 1px solid var(--danger-border);
  color: var(--danger);
  font-size: 0.68rem;
  font-weight: 700;
}

.pdf-card-body {
  flex: 1;
  min-width: 0;
}

.pdf-card-title {
  font-size: 0.9rem;
  color: var(--text);
}

.pdf-card-meta {
  font-size: 0.76rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.videos-toolbar {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-bottom: 0.9rem;
}

.videos-toolbar .input-text {
  flex: 1;
  min-width: 240px;
}

.videos-list {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.video-topic-heading {
  font-size: 0.95rem;
  color: var(--text);
  margin-bottom: 0.5rem;
  padding-bottom: 0.25rem;
  border-bottom: 1px solid var(--border-subtle);
}

.videos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 0.8rem;
}

.video-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.video-thumb-wrap {
  position: relative;
  aspect-ratio: 16 / 9;
  background: var(--bg-deep-contrast);
}

.video-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.video-thumb-placeholder {
  display: grid;
  place-items: center;
  color: var(--text-muted);
  font-size: 1.4rem;
}

.video-play-btn {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--accent-border);
  background: rgba(24, 27, 31, 0.82);
  color: var(--accent-text);
  cursor: pointer;
}

.video-embed {
  width: 100%;
  height: 100%;
  border: 0;
}

.video-card-body {
  padding: 0.65rem 0.75rem;
}

.video-title {
  font-size: 0.9rem;
  color: var(--text);
}

.video-description {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 0.2rem;
  line-height: 1.5;
}

.video-meta {
  font-size: 0.74rem;
  color: var(--text-muted);
  margin-top: 0.3rem;
}

.video-card-actions {
  margin-top: 0.45rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.video-embed-fallback {
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 9;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0.9rem;
  background: rgba(21, 19, 26, 0.85);
  border: 1px dashed var(--border, #51465F);
  border-radius: var(--radius-sm, 6px);
  gap: 0.35rem;
}

.video-fallback-icon {
  font-size: 1.35rem;
  line-height: 1;
}

.video-fallback-title {
  font-weight: 600;
  font-size: 0.84rem;
  color: var(--text, #F4F0E8);
}

.video-fallback-sub {
  font-size: 0.74rem;
  color: var(--text-muted, #B8B0C4);
  max-width: 28ch;
  margin: 0;
}

.admin-url-feedback {
  font-size: 0.74rem;
  margin-top: 0.35rem;
  min-height: 1.1rem;
}

.admin-url-feedback.is-valid {
  color: #8CBFA3;
}

.admin-url-feedback.is-invalid {
  color: #E06C75;
}

.subject-viz-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0.8rem;
  margin-bottom: 1rem;
}

.subject-viz-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 0.8rem;
}

.subject-viz-info h4 {
  font-size: 0.92rem;
  margin: 0.25rem 0;
}

.subject-viz-info p {
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.pdf-viewer-card {
  max-width: 1080px;
  width: 96vw;
  max-height: 92vh;
  display: flex;
  flex-direction: column;
}

.pdf-viewer-header {
  align-items: flex-start;
  gap: 0.75rem;
}

.pdf-viewer-meta {
  font-size: 0.78rem;
  margin-top: 0.15rem;
}

.pdf-viewer-actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.pdf-viewer-frame-wrap {
  flex: 1;
  min-height: 60vh;
  background: var(--bg-deep-contrast);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.pdf-viewer-frame-wrap iframe {
  width: 100%;
  height: 100%;
  min-height: 60vh;
  border: 0;
  display: block;
}

.pdf-viewer-fallback {
  padding: 1rem;
}

.pdf-viewer-hint {
  padding: 0.5rem 0.8rem;
  font-size: 0.76rem;
  color: var(--text-muted);
}

.viz-objective {
  margin-top: 0.4rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
  background: var(--bg-elevated);
  border-left: 2px solid var(--accent-border);
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius-xs);
}

.viz-steps-title,
.viz-challenge-title {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
}

.viz-steps {
  margin-left: 1.1rem;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

.viz-challenge {
  margin-top: 0.7rem;
  border: 1px dashed var(--accent-border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.7rem;
  background: var(--accent-tint);
}

.viz-challenge-prompt {
  font-size: 0.82rem;
  margin: 0.25rem 0 0.5rem;
}

.viz-challenge-feedback {
  font-size: 0.8rem;
  margin-top: 0.4rem;
}

.viz-challenge-feedback.is-correct {
  color: var(--success);
}

.viz-challenge-feedback.is-incorrect {
  color: var(--danger);
}

.viz-svg {
  width: 100%;
  max-width: 320px;
  height: auto;
  background: var(--bg-deep-contrast);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
}

.viz-axis {
  stroke: var(--border-strong);
  stroke-width: 1.2;
}

.viz-axis-label,
.viz-vertex-label {
  fill: var(--text-muted);
  font-size: 7px;
}

.viz-region {
  fill: var(--accent-tint);
  stroke: var(--accent);
  stroke-width: 1.5;
}

.viz-vertex {
  fill: var(--accent);
}

.viz-optimal {
  fill: var(--success);
  stroke: var(--bg);
  stroke-width: 2;
}

.viz-point-a {
  fill: var(--accent);
}

.viz-point-b {
  fill: var(--success);
}

.viz-centroid-a {
  fill: var(--danger);
}

.viz-centroid-b {
  fill: #60a5fa;
}

.viz-plot {
  display: flex;
  justify-content: center;
  padding: 0.4rem 0;
}

.viz-number-input {
  width: 78px;
}

.viz-tcp-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  flex-wrap: wrap;
  padding: 0.8rem;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  background: var(--bg-deep-contrast);
}

.viz-tcp-host {
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.7rem;
  text-align: center;
  font-size: 0.82rem;
  color: var(--text);
}

.viz-tcp-state {
  font-size: 0.7rem;
  color: var(--accent-text);
  margin-top: 0.2rem;
}

.viz-tcp-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  font-size: 0.78rem;
  color: var(--text-secondary);
  min-width: 110px;
}

.viz-tcp-arrow::before {
  content: "→";
  color: var(--accent);
  font-size: 1.2rem;
}

.viz-tcp-arrow small {
  font-size: 0.68rem;
  color: var(--text-muted);
}

.viz-confusion {
  display: grid;
  grid-template-columns: 90px 1fr 1fr;
  gap: 4px;
  font-size: 0.8rem;
}

.viz-confusion-head {
  color: var(--text-muted);
  font-size: 0.72rem;
  display: flex;
  align-items: center;
}

.viz-confusion-cell {
  padding: 0.55rem;
  border-radius: var(--radius-xs);
  text-align: center;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text);
}

.viz-confusion-cell.tp,
.viz-confusion-cell.tn {
  border-color: var(--success-border);
}

.viz-confusion-cell.fp,
.viz-confusion-cell.fn {
  border-color: var(--danger-border);
}

.viz-tree {
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.8rem;
  background: var(--bg-deep-contrast);
}

.viz-tree-node {
  display: inline-block;
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.6rem;
  font-size: 0.8rem;
  color: var(--accent-text);
  margin-bottom: 0.6rem;
}

.viz-tree-branches {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.viz-tree-branch {
  font-size: 0.8rem;
  color: var(--text-secondary);
  border-left: 2px solid var(--border-strong);
  padding-left: 0.6rem;
}

.viz-outlier-row {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.viz-outlier-chip {
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  padding: 0.2rem 0.45rem;
  font-size: 0.78rem;
  font-family: var(--font-mono, monospace);
  color: var(--text-secondary);
}

.viz-outlier-chip.is-outlier {
  border-color: var(--danger-border);
  background: var(--danger-bg);
  color: var(--danger);
}

.viz-table tr.is-current {
  background: var(--accent-tint);
}

@media (max-width: 860px) {
  .topbar-context-actions {
    order: 3;
    width: 100%;
    margin: 0.4rem 0 0;
  }

  .pdf-viewer-card {
    width: 100vw;
    max-height: 96vh;
  }

  .pdf-viewer-actions {
    justify-content: flex-start;
  }
}



/* --- Question & Option Images (Phase 9 & 14) --- */
.question-image-wrap {
  margin: 0.75rem 0;
  text-align: center;
}
.question-stem-img {
  max-width: 100%;
  max-height: 280px;
  border-radius: 8px;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease;
}
.question-stem-img:hover {
  transform: scale(1.015);
  border-color: var(--primary);
}
.option-image-wrap {
  margin-top: 0.45rem;
}
.option-img {
  max-width: 100%;
  max-height: 120px;
  border-radius: 4px;
  border: 1px solid var(--border);
  cursor: pointer;
}
.explanation-image-wrap {
  margin-top: 0.65rem;
}
.explanation-img {
  max-width: 100%;
  max-height: 200px;
  border-radius: 6px;
  border: 1px solid var(--border);
  cursor: pointer;
}

/* --- Import Format Guide (Phase 7 & 14) --- */
.import-format-guide {
  background: rgba(198, 99, 67, 0.07);
  border: 1px solid rgba(198, 99, 67, 0.24);
  border-radius: 10px;
  padding: 0.85rem 1.1rem;
  margin-bottom: 1.1rem;
}
.import-format-guide .guide-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.6rem;
}
.import-format-guide .guide-bullets {
  margin: 0;
  padding-left: 1.3rem;
  font-size: 0.86rem;
  line-height: 1.55;
  color: var(--text-secondary);
}
.import-format-guide .guide-bullets li {
  margin-bottom: 0.35rem;
}

/* --- Image Preview Modal --- */
.image-preview-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

/* --- Mobile touch targets & stability (Section 13) --- */
@media (max-width: 768px) {
  .btn, .btn-sm, .btn-nav, .option-btn {
    min-height: 44px;
  }
  .input-select, .input-text {
    min-height: 44px;
    font-size: 16px; /* Prevents auto-zoom on iOS */
  }
}

/* --- Fixed SVG Icon Dimensions & Anti-Overlap Guards (Phase 16) --- */
svg.nav-icon {
  width: 18px;
  height: 18px;
  min-width: 18px;
  min-height: 18px;
  flex-shrink: 0;
}

svg.subject-stat-icon,
svg.admin-btn-icon,
svg.action-icon {
  width: 14px;
  height: 14px;
  min-width: 14px;
  min-height: 14px;
  flex-shrink: 0;
  vertical-align: middle;
}

svg.search-icon {
  width: 16px;
  height: 16px;
  min-width: 16px;
  min-height: 16px;
  flex-shrink: 0;
}

.admin-access-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

/* --- Structured 5-Part Academic Explanation Panel (Phase 16) --- */
.structured-explanation-panel {
  margin-top: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  border-top: 1px solid var(--border);
  padding-top: 0.7rem;
}

.structured-explanation-panel .exp-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.6rem 0.85rem;
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--text);
  overflow-wrap: anywhere;
}

.structured-explanation-panel .exp-block-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-text);
  margin-bottom: 0.25rem;
}

.structured-explanation-panel .exp-block--arabic {
  border-right: 3px solid var(--accent);
  background: rgba(200, 109, 78, 0.12);
}

.structured-explanation-panel .exp-block-body--rtl {
  direction: rtl;
  text-align: right;
  font-family: "Noto Kufi Arabic", "Noto Sans Arabic", "Segoe UI", Tahoma, sans-serif;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--text);
}

.structured-explanation-panel .exp-block--reasoning {
  border-left: 3px solid var(--success);
  background: rgba(106, 142, 88, 0.12);
}

.structured-explanation-panel .exp-block--wrong {
  border-left: 3px solid var(--warning);
  background: rgba(201, 146, 66, 0.12);
}

.structured-explanation-panel .exp-block--trick {
  border-left: 3px solid var(--accent);
  background: rgba(200, 109, 78, 0.14);
}

.exp-unavailable-badge {
  display: inline-block;
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  background: var(--bg-elevated);
  color: var(--text-muted);
  font-size: 0.82rem;
}

/* --- PDF Cards & Actions (Phase 16) --- */
.pdf-card {
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
}

.pdf-card-thumb {
  width: 40px;
  height: 48px;
  flex-shrink: 0;
  border-radius: 10px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
}

.pdf-thumb-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.pdf-card-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin-left: auto;
}

/* --- Mobile Layout & Narrow Viewport Safeguards (320px - 768px) --- */
@media (max-width: 768px) {
  .app-topbar {
    padding: 0.55rem 0.85rem;
    gap: 0.4rem 0.6rem;
  }

  .topbar-context-actions {
    width: auto;
    margin: 0 0 0 auto;
    order: 2;
    flex-wrap: wrap;
  }

  .pdfs-grid,
  .videos-grid,
  .subject-viz-list,
  .lectures-grid,
  .quizzes-grid,
  .sheets-grid {
    grid-template-columns: minmax(0, 1fr) !important;
  }

  .videos-toolbar .input-text {
    min-width: 0;
    width: 100%;
  }

  .pdf-card-actions {
    width: 100%;
    margin-left: 0;
    margin-top: 0.4rem;
  }

  .player-footer {
    position: sticky;
    bottom: 64px;
    z-index: 25;
    background: rgba(44, 39, 35, 0.96);
    backdrop-filter: blur(8px);
    padding: 0.55rem 0.7rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.28);
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    justify-content: space-between;
  }

  .player-footer .btn {
    flex: 1 1 auto;
    min-width: 0;
    padding: 0.5rem 0.6rem;
    font-size: 0.82rem;
  }
}

@media (max-width: 420px) {
  .container {
    padding-left: 0.65rem !important;
    padding-right: 0.65rem !important;
  }

  .faculty-term-btn {
    font-size: 0.7rem;
    padding: 0.25rem 0.55rem;
    max-width: 190px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .subject-hero-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.4rem;
    width: 100%;
  }

  .subject-hero-actions .btn {
    width: 100%;
    justify-content: center;
    font-size: 0.76rem;
    padding: 0.45rem 0.5rem;
  }
}