/* ==========================================================================
   Bank Question — Faculty of AI Learning Lab
   Warm Clay Study Redesign Layer. Loaded after styles.css so the existing
   engine/layout remains intact while the calm clay visual system is applied.
   ========================================================================== */

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

  --accent: #F47B5C;
  --accent-hover: #FF9070;
  --accent-text: #FFAB94;
  --accent-tint: rgba(244, 123, 92, 0.20);
  --accent-border: rgba(244, 123, 92, 0.45);
  --on-accent: #FFFFFF;

  --bg: #18363C;
  --bg: #10343E;
  --bg-deep-contrast: #0A2229;
  --bg-secondary: #0D2830;
  --bg-sidebar: #0D2830;
  --bg-topbar: #0E303A;
  --bg-card: #2C626B;
  --bg-card-hover: #3F8588;
  --bg-elevated: #34737A;
  --bg-elevated-hover: #3F8588;

  --border: #5B9D9B;
  --border-soft: #3B777A;
  --border-subtle: #3B777A;
  --border-strong: #74B5B3;

  --text: #F3F3E8;
  --text-secondary: #C1D6D0;
  --text-muted: #8FB5B0;

  --success: #6FD6B7;
  --success-bg: rgba(111, 214, 183, 0.18);
  --success-border: rgba(111, 214, 183, 0.45);
  --danger: #E77772;
  --danger-bg: rgba(231, 119, 114, 0.18);
  --danger-border: rgba(231, 119, 114, 0.45);
  --warning: #F0C34D;
  --warning-bg: rgba(240, 195, 77, 0.18);
  --warning-border: rgba(240, 195, 77, 0.45);
  --progress: #F47B5C;
  --teal-soft: #6FD6B7;

  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius: 12px;
  --radius-controls: 10px;
  --radius-card: 16px;
  --radius-lg: 16px;
  --shadow-sm: 0 2px 8px rgba(10, 30, 35, 0.28), 0 1px 3px rgba(10, 30, 35, 0.20);
  --shadow-md: 0 12px 28px -4px rgba(10, 30, 35, 0.42), 0 4px 10px rgba(10, 30, 35, 0.25);

  --font-display: "Plus Jakarta Sans", "Segoe UI", "Inter", system-ui, sans-serif;
  --font-mono: "Cascadia Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;

  --lab-grid: rgba(99, 210, 181, 0.03);
  --lab-line: rgba(90, 133, 133, 0.45);
}

body {
  background-color: var(--bg);
  background-image:
    radial-gradient(ellipse 70% 55% at 85% 5%, rgba(240, 120, 88, 0.12), transparent 60%),
    radial-gradient(ellipse 65% 50% at 10% 25%, rgba(99, 210, 181, 0.12), transparent 55%),
    linear-gradient(180deg, #18363C 0%, #1D4147 100%);
  background-attachment: fixed;
  font-family: var(--font-display);
  color: var(--text);
}

/* ------------------------------ shell / nav ------------------------------ */
.app-shell {
  grid-template-columns: 264px minmax(0, 1fr);
}

.app-sidebar {
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
}

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

.brand-title {
  font-family: var(--font-display);
  letter-spacing: -0.01em;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}

.sidebar-group-label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  text-transform: uppercase;
}

.btn-nav {
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.86rem;
  font-weight: 500;
  padding: 0.55rem 0.7rem;
}

.btn-nav:hover {
  background: rgba(244, 123, 92, 0.08);
  border-color: var(--border-subtle);
  color: var(--text);
}

.btn-nav.active {
  background: var(--bg-card);
  border-color: var(--accent-border);
  color: var(--accent-text);
  font-weight: 600;
  box-shadow: 0 2px 6px rgba(10, 35, 40, 0.22), inset 3px 0 0 var(--accent);
}

.sidebar-subject-item {
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 0.46rem 0.65rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.sidebar-subject-item:hover {
  background: rgba(244, 123, 92, 0.08);
  border-color: var(--border-subtle);
  color: var(--text);
}

.sidebar-subject-item.active {
  background: var(--bg-card);
  border-color: var(--accent-border);
  color: var(--text);
  font-weight: 600;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.app-topbar {
  background: rgba(246, 241, 232, 0.94);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
  padding: 0.6rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.topbar-context {
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
}

.faculty-term-btn,
.admin-access-btn,
.student-profile-btn {
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.creator-badge-btn,
.creator-badge-sig,
.creator-badge-feedback {
  font-size: 0.74rem;
}

.container {
  max-width: 1440px;
  padding: 1.25rem 1.5rem 3rem;
}

/* ------------------------------ typography ------------------------------ */
.dashboard-hero-title,
.section-title,
.subject-hero-title,
.lecture-page-title,
#playerQuizTitle,
#resultsQuizTitle {
  font-family: var(--font-display);
  letter-spacing: -0.015em;
  color: var(--text);
}

.dashboard-hero-title {
  font-size: 1.45rem;
  font-weight: 700;
}

.section-title {
  font-size: 1.24rem;
  font-weight: 700;
}

.section-subtitle,
.text-muted {
  color: var(--text-muted);
}

.lab-eyebrow,
.subject-code,
.lab-mini-label,
.stat-label,
.question-num-badge,
.badge,
.pill,
.tab-count {
  font-family: var(--font-display);
}

/* ------------------------------ badges / buttons ------------------------------ */
.badge {
  border-radius: 999px;
  letter-spacing: 0.03em;
  font-weight: 600;
  font-size: 0.68rem;
  padding: 0.2rem 0.55rem;
}

.btn {
  border-radius: var(--radius-controls);
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid var(--border-strong);
  transition: border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease),
    transform var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}

.btn-primary {
  background: var(--accent);
  border-color: #D65A3A;
  color: #FFFFFF;
  font-weight: 600;
  box-shadow: 0 2px 5px rgba(244, 123, 92, 0.32), inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
  border-color: #E26848;
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-card);
  border-color: var(--border-strong);
  color: var(--text-secondary);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.18);
}

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

.btn-ghost {
  border-color: transparent;
  color: var(--text-secondary);
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-sm);
}

.input-text,
.input-select,
.input-textarea {
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-controls);
  color: var(--text);
  font-family: var(--font-display);
  font-size: 0.86rem;
}

.input-text:focus,
.input-select:focus,
.input-textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(244, 123, 92, 0.25);
}

/* ------------------------------ dashboard hero ------------------------------ */
.lab-hero {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.lab-hero-main {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(210px, 0.45fr);
  gap: 1.25rem;
  align-items: center;
}

.lab-eyebrow {
  display: inline-block;
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-text);
  margin-bottom: 0.2rem;
}

.lab-eyebrow span {
  color: var(--text-muted);
  margin: 0 0.25rem;
}

.lab-hero-heading {
  font-size: clamp(1.3rem, 2vw, 1.65rem);
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.lab-hero-sub {
  max-width: 60ch;
  margin-top: 0.25rem;
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-secondary);
}

.lab-hero-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.5rem;
}

.lab-chip {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.2rem 0.65rem;
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-elevated);
}

.lab-chip-muted {
  color: var(--text-muted);
}

.lab-hero-progress {
  position: relative;
  z-index: 1;
  align-self: center;
  border-left: 1px solid var(--border);
  padding-left: 1.2rem;
}

.lab-progress-number {
  font-size: clamp(1.75rem, 3vw, 2.2rem);
  line-height: 1;
  font-weight: 800;
  color: var(--accent-text);
  letter-spacing: -0.03em;
}

.lab-progress-label {
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.lab-progress-track {
  height: 6px;
  background: var(--bg-elevated);
  border-radius: 999px;
  margin-top: 0.45rem;
  overflow: hidden;
}

.lab-progress-fill {
  height: 100%;
  width: 0%;
  background: var(--accent);
  border-radius: 999px;
  transition: width 400ms var(--ease);
}

.lab-progress-meta {
  margin-top: 0.45rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.lab-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 0.9rem 1rem;
  margin-bottom: 1rem;
}

.lab-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.6rem;
}

.lab-panel-head h3 {
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.lab-mini-label {
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

.lab-recent-list {
  display: grid;
  gap: 0.35rem;
}

.lab-recent-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.65rem;
  background: var(--bg-elevated);
}

.lab-recent-row strong {
  display: block;
  font-size: 0.82rem;
  color: var(--text);
}

.lab-recent-row span {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.lab-recent-score {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--accent-text);
}

.lab-empty {
  color: var(--text-muted);
  font-size: 0.82rem;
  padding: 0.35rem 0;
}

/* ------------------------------ stat strip ------------------------------ */
.stats-compact-row {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 0.55rem;
  background: transparent;
  border: 0;
  padding: 0;
  margin-bottom: 0.2rem;
}

.stat-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.75rem;
  position: relative;
  overflow: hidden;
}

.stat-label {
  display: block;
  font-size: 0.64rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.stat-value {
  display: block;
  margin-top: 0.2rem;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
}

/* ------------------------------ continue banner ------------------------------ */
.continue-banner {
  background: var(--bg-card);
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-card);
  padding: 0.8rem 1rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-sm);
}

.continue-label {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-text);
}

.continue-title {
  font-size: 0.94rem;
  color: var(--text);
}

/* ------------------------------ subject cards ------------------------------ */
.subject-card {
  --s-accent: var(--accent);
  --s-soft: rgba(244, 123, 92, 0.14);
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 1rem 1.1rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease),
    box-shadow var(--t-fast) var(--ease);
  overflow: hidden;
}

.subject-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--s-accent);
  opacity: 0.9;
}

.subject-card:hover,
.subject-card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--s-accent);
  box-shadow: var(--shadow-md);
}

.subject-card-icon-box {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--s-soft);
  border: 1px solid color-mix(in srgb, var(--s-accent) 34%, transparent);
  color: var(--s-accent);
  display: grid;
  place-items: center;
  box-shadow: inset 0 2px 2px rgba(255, 255, 255, 0.65), inset 0 -2px 3px rgba(68, 48, 34, 0.1), 0 4px 10px -2px rgba(68, 48, 34, 0.12);
}

.subject-icon-svg {
  stroke: var(--s-accent);
}

.subject-card-code-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 0.2rem;
}

.subject-code {
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--s-accent);
  border: 1px solid color-mix(in srgb, var(--s-accent) 36%, transparent);
  border-radius: 6px;
  padding: 0.08rem 0.38rem;
  background: var(--s-soft);
}

.subject-code-label {
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.subject-card-title {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text);
}

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

.subject-status-pill {
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text-secondary);
  margin-left: auto;
  align-self: flex-start;
}

.subject-status-pill.in-progress {
  color: var(--s-accent);
  border-color: color-mix(in srgb, var(--s-accent) 40%, transparent);
  background: var(--s-soft);
}

.subject-status-pill.completed {
  color: var(--success);
  border-color: var(--success-border);
  background: var(--success-bg);
}

.subject-card-metric-row {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-top: 0.55rem;
}

.subject-completion-huge {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--s-accent);
  line-height: 1;
}

.subject-not-started {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
}

.subject-last-active {
  display: none;
}

.subject-card-progress {
  margin-top: 0.45rem;
}

.subject-progress-track {
  height: 5px;
  background: var(--bg-elevated);
  border-radius: 999px;
  overflow: hidden;
}

.subject-progress-fill {
  height: 100%;
  background: var(--s-accent);
  border-radius: 999px;
  transition: width 400ms var(--ease);
}

/* Distinct Subject Accents (Harmonious Academic Palette: Coral, Mint, Green, Yellow, Orange, Red) */
[data-subject-id="logic-number-systems"],
#subjectQuizzesView[data-subject-id="logic-number-systems"] {
  --s-accent: #F0C34D;
  --s-soft: rgba(240, 195, 77, 0.18);
}
[data-subject-id="data-mining"],
#subjectQuizzesView[data-subject-id="data-mining"] {
  --s-accent: #91D36B;
  --s-soft: rgba(145, 211, 107, 0.18);
}
[data-subject-id="data-communication-networks-csc214"],
#subjectQuizzesView[data-subject-id="data-communication-networks-csc214"] {
  --s-accent: #6FD6B7;
  --s-soft: rgba(111, 214, 183, 0.18);
}
[data-subject-id="operations-research"],
#subjectQuizzesView[data-subject-id="operations-research"] {
  --s-accent: #F47B5C;
  --s-soft: rgba(244, 123, 92, 0.18);
}
[data-subject-id="machine-learning-pattern-recognition"],
#subjectQuizzesView[data-subject-id="machine-learning-pattern-recognition"] {
  --s-accent: #F47B5C;
  --s-soft: rgba(244, 123, 92, 0.18);
}
[data-subject-id="numerical-analysis"],
#subjectQuizzesView[data-subject-id="numerical-analysis"] {
  --s-accent: #E77772;
  --s-soft: rgba(231, 119, 114, 0.18);
}

/* ------------------------------ subject page ------------------------------ */
.subject-hero-banner {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--s-accent, var(--accent));
  border-radius: var(--radius-card);
  padding: 1.15rem 1.3rem;
  box-shadow: var(--shadow-sm);
}

.subject-hero-title {
  font-size: clamp(1.35rem, 2.2vw, 1.85rem);
  color: var(--text);
}

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

.subject-quick-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.subject-quick-stat {
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  padding: 0.4rem 0.65rem;
  min-width: 96px;
}

.subject-quick-label {
  display: block;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.subject-quick-value {
  display: block;
  font-size: 0.94rem;
  font-weight: 700;
  color: var(--s-accent, var(--accent-text));
  margin-top: 0.1rem;
}

.subject-quick-recent {
  font-family: var(--font-display);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.subject-tabs-bar {
  border-bottom: 1px solid var(--border);
  gap: 0.25rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.subject-tab-btn {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  border: 0;
  border-bottom: 2px solid transparent;
  background: transparent;
  padding: 0.65rem 0.85rem;
  white-space: nowrap;
}

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

.subject-tab-btn.active {
  color: var(--s-accent, var(--accent-text));
  border-bottom-color: var(--s-accent, var(--accent));
  background: var(--s-soft, var(--accent-tint));
}

.tab-count {
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* lecture / quiz / sheet / pdf cards */
.lecture-card,
.quiz-card,
.sheet-card,
.pdf-card,
.subject-viz-card,
.video-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease),
    box-shadow var(--t-fast) var(--ease);
}

.lecture-card:hover,
.quiz-card:hover,
.sheet-card:hover,
.pdf-card:hover,
.subject-viz-card:hover,
.video-card:hover {
  border-color: color-mix(in srgb, var(--s-accent, var(--accent)) 55%, var(--border));
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.lecture-card-title,
.quiz-card-title,
.sheet-card-title,
.pdf-card-title {
  font-family: var(--font-display);
  color: var(--text);
}

/* ------------------------------ quiz player ------------------------------ */
.quiz-top-bar {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 0.7rem 1rem;
  box-shadow: var(--shadow-sm);
}

#playerQuizTitle {
  font-size: 1.05rem;
}

.quiz-player-layout {
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 1rem;
}

.question-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-top: 3px solid var(--s-accent, var(--accent));
  border-radius: var(--radius-card);
  padding: 1.35rem;
  box-shadow: var(--shadow-sm);
}

.question-stem {
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--text);
}

.option-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 0.9rem;
  font-size: 0.92rem;
  color: var(--text);
  transition: border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}

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

.option-btn.selected {
  border-color: var(--accent);
  background: var(--accent-tint);
  color: var(--text);
}

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

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

.option-letter {
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-text);
}

.feedback-box {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  color: var(--text);
  font-size: 0.88rem;
}

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

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

.question-navigator-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-sm);
}

.nav-dot {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: var(--font-mono);
  color: var(--text-secondary);
}

.nav-dot.current {
  border-color: var(--accent);
  background: var(--accent-tint);
  color: var(--accent-text);
  font-weight: 700;
}

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

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

/* ------------------------------ results ------------------------------ */
.results-summary-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-sm);
}

.score-big {
  font-family: var(--font-mono);
  color: var(--accent-text);
  letter-spacing: -0.02em;
}

.breakdown-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.breakdown-opt {
  border-color: var(--border-subtle);
}

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

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

/* ------------------------------ mistakes / content / admin ------------------------------ */
.mistakes-tabs-bar .subject-tab-btn.active {
  color: var(--accent-text);
  border-bottom-color: var(--accent);
}

.content-panel,
.import-preview,
.admin-library-row,
.import-package-card {
  border-radius: var(--radius-sm);
}

.content-subject-row {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
}

.modal-card {
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-md);
}

.modal-header,
.modal-footer {
  border-color: var(--border);
}

.admin-security-note {
  border-left: 3px solid var(--warning);
  padding-left: 0.65rem;
}

.pdf-viewer-card {
  border-color: var(--border-strong);
}

/* ------------------------------ visualizations ------------------------------ */
.viz-shell {
  border-top: 3px solid var(--s-accent, var(--accent));
}

.viz-card {
  border-top: 1px solid var(--border);
}

.viz-card::before {
  content: "";
  display: block;
  width: 28px;
  height: 3px;
  background: var(--s-accent, var(--accent));
  border-radius: 99px;
  margin-bottom: 0.4rem;
}

.viz-objective {
  border-left-color: var(--s-accent, var(--accent));
}

/* ------------------------------ mobile ------------------------------ */
.mobile-bottom-bar {
  background: rgba(255, 252, 247, 0.97);
  border-top: 1px solid var(--border);
  backdrop-filter: blur(10px);
}

.mobile-tab-btn {
  color: var(--text-muted);
  font-size: 0.64rem;
  font-weight: 600;
}

.mobile-tab-btn.active {
  color: var(--accent-text);
}

@media (max-width: 1180px) {
  .stats-compact-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .lab-hero {
    grid-template-columns: 1fr;
  }

  .lab-hero-progress {
    border-left: 0;
    border-top: 1px solid var(--border);
    padding-left: 0;
    padding-top: 0.85rem;
  }
}

@media (max-width: 860px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .container {
    padding: 1rem 0.85rem 5rem;
  }

  .quiz-player-layout {
    grid-template-columns: 1fr;
  }

  .stats-compact-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .lab-hero {
    padding: 1rem;
  }

  .lab-hero-heading {
    font-size: 1.5rem;
  }
}

@media (max-width: 560px) {
  .topbar-creator-capsule {
    display: none;
  }

  .stats-compact-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .subject-quick-stat {
    min-width: calc(50% - 0.5rem);
  }

  .question-card {
    padding: 1rem;
  }

  .question-stem {
    font-size: 0.98rem;
  }
}

/* ------------------------------ lecture interactive tools ------------------------------ */
.lecture-tools-section {
  margin: 1.25rem 0;
  padding: 1.1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-sm);
}

.lecture-tools-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
}

.lecture-tools-header .section-title {
  margin: 0.35rem 0 0;
}

.lecture-tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 0.85rem;
}

.lecture-tool-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.95rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.lecture-tool-card:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.lecture-tool-info h4 {
  margin: 0.4rem 0 0.25rem;
  font-size: 0.98rem;
  color: var(--text);
}

.lecture-tool-info p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.82rem;
  line-height: 1.45;
}

.lecture-tool-card .btn {
  align-self: flex-start;
}

#lectureVizStage:empty {
  display: none;
}

@media (max-width: 860px) {
  .lecture-tools-grid {
    grid-template-columns: 1fr;
  }
}

/* RTL support for Arabic explanation blocks and Arabic UI copy */
[dir="rtl"] .question-stem,
[dir="rtl"] .option-text,
.viz-explanation-ar,
.explanation-box[dir="auto"] {
  text-align: right;
}

[dir="rtl"] .lab-recent-row,
[dir="rtl"] .content-subject-row {
  flex-direction: row-reverse;
}