:root {
  --bg: #0b1220;
  --panel: rgba(255, 255, 255, 0.06);
  --panel-strong: rgba(255, 255, 255, 0.1);
  --text: rgba(255, 255, 255);
  --muted: rgba(255, 255, 255);
  --border: rgba(255, 255, 255, 0.12);
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
  --primary: #7c3aed;
  --primary-2: #a78bfa;
  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --focus: 0 0 0 4px rgba(124, 58, 237, 0.35);
}

* {
  box-sizing: border-box;
  font-family: "IBM Plex Sans Arabic", sans-serif;
}

body {
  font-family:
    system-ui,
    -apple-system,
    Segoe UI,
    Roboto,
    Arial,
    "Noto Sans Arabic",
    "Noto Kufi Arabic",
    "Noto Naskh Arabic",
    sans-serif;
  background:
    radial-gradient(
      1200px 700px at 85% 10%,
      rgba(124, 58, 237, 0.35),
      transparent 60%
    ),
    radial-gradient(
      900px 600px at 15% 0%,
      rgba(34, 197, 94, 0.18),
      transparent 55%
    ),
    var(--bg);
  color: var(--text);
  opacity: 0.9;
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: center;
}

.container {
  width: min(1100px, 94vw);
  margin: 24px auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-bottom: 88px; /* keep space for the fixed shortcuts bar */
}

@media (max-width: 520px) {
  .container {
    padding-bottom: 100px; /* more space for fixed bottom nav on mobile */
  }
}

footer {
  width: 100%;
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--muted);
  opacity: 0.7;
  font-size: 13px;
  line-height: 1.6;
  text-align: center;
}

footer a {
  color: var(--primary-2);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1px dashed rgba(167, 139, 250, 0.5);
  padding-bottom: 1px;
}

footer a:hover {
  color: white;
  border-bottom-color: rgba(255, 255, 255, 0.65);
}

footer a:focus-visible {
  outline: none;
  box-shadow: var(--focus);
  border-radius: 6px;
}

.footer-meta-links {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 8px;
  flex-wrap: wrap;
}

.visitor-counter,
.github-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 12px;
}

.visitor-counter img {
  height: 20px;
  max-width: 150px;
}

.github-link {
  min-height: 24px;
  padding: 2px 8px;
  border: 1px solid rgba(167, 139, 250, 0.35);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  border-bottom-style: solid;
}

.github-link:hover {
  color: var(--primary-2);
  border-color: rgba(167, 139, 250, 0.42);
  background: rgba(255, 255, 255, 0.07);
}

.github-link svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

#quiz-container {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Slides (one question per view) */
.slides-shell {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 14px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
}

@media (max-width: 520px) {
  .slides-shell {
    display: flex;
    flex-direction: column;
  }

  /* Reorder: chapter motivation first on mobile */
  .slides-shell .chapter-motivation {
    order: -2;
  }

  .slides-shell .chapter-progress {
    order: -1;
  }

  .slides-shell .slides-top {
    order: 0;
  }
}

.slides-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.progress {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.progress .meter {
  width: min(420px, 82vw);
  height: 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  overflow: hidden;
}

.progress .meter > span {
  display: block;
  height: 100%;
  width: 0%;
  background: var(--primary);
  border-radius: 999px;
  transition: width 180ms ease;
}

.slide-actions {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.nav-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  font-weight: 700;
  opacity: 1;
  cursor: pointer;
  transition:
    transform 120ms ease,
    background 120ms ease,
    border-color 120ms ease,
    opacity 120ms ease;
  user-select: none;
}

.nav-btn:hover {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(167, 139, 250, 0.45);
}

.nav-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.nav-btn.primary {
  background: var(--primary);

  box-shadow: 0 10px 30px rgba(124, 58, 237, 0.25);
}

.slide-enter {
  animation: slideFade 160ms ease;
}

@keyframes slideFade {
  from {
    opacity: 0.7;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.question {
  background: linear-gradient(
    180deg,
    var(--panel-strong),
    rgba(255, 255, 255, 0.04)
  );
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px 14px 10px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.question h2 {
  margin: 0 0 16px;
  font-size: 18px;
  line-height: 1.45;
  letter-spacing: 0.1px;
}

.question-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.question-meta .meta-badges {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.question-meta .meta-status {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.06);
  color: var(--muted);
  opacity: 0.7;
  font-size: 12px;
  user-select: none;
}

.badge strong {
  color: var(--text);
  font-weight: 700;
  opacity: 0.9;
}

.question-status {
  font-size: 12px;
  color: var(--muted);
  opacity: 0.7;
}

.study-mode-badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 5px 10px;
  border-radius: 999px;
  border: 1px solid rgba(34, 197, 94, 0.35);
  background: rgba(34, 197, 94, 0.1);
  color: var(--success);
  font-size: 12px;
  font-weight: 700;
}

.bookmark-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.06);
  color: var(--muted);
  cursor: pointer;
  transition:
    transform 150ms ease,
    background 150ms ease,
    border-color 150ms ease,
    color 150ms ease;
}

.bookmark-btn:hover {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.1);
  color: var(--warning);
}

.bookmark-btn.active {
  border-color: rgba(245, 158, 11, 0.45);
  background: rgba(245, 158, 11, 0.14);
  color: var(--warning);
}

.bookmark-btn:focus-visible {
  outline: none;
  box-shadow: var(--focus);
}

.bookmark-btn svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.question.correct-question {
  border-color: rgba(34, 197, 94, 0.45);
  box-shadow:
    0 0 0 4px rgba(34, 197, 94, 0.08),
    0 12px 30px rgba(0, 0, 0, 0.18);
}

.question.incorrect-question {
  border-color: rgba(239, 68, 68, 0.45);
  box-shadow:
    0 0 0 4px rgba(239, 68, 68, 0.08),
    0 12px 30px rgba(0, 0, 0, 0.18);
}

.question.unanswered-question {
  border-color: rgba(245, 158, 11, 0.5);
  box-shadow:
    0 0 0 4px rgba(245, 158, 11, 0.1),
    0 12px 30px rgba(0, 0, 0, 0.18);
}

.choice {
  font-size: 15px;
}
.answers {
  list-style-type: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.answers li {
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(0, 0, 0, 0.18);
  border-radius: 12px;
  padding: 0; /* move padding onto label so the whole tile is clickable */
  transition:
    transform 120ms ease,
    border-color 120ms ease,
    background 120ms ease;
}

.answers li:hover {
  transform: translateY(-1px);
  border-color: rgba(167, 139, 250, 0.45);
  background: rgba(0, 0, 0, 0.22);
}

/* Make the entire answer tile clickable (not just the text area) */
.answers li > label {
  width: 100%;
  padding: 10px 10px;
}

label {
  display: flex;
  gap: 10px;
  align-items: center;
  cursor: pointer;
  line-height: 1.5;
}

.answer-key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 26px;
  height: 26px;
  padding: 0 6px;
  border-radius: 8px;
  border: 2px solid rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.04);
  color: var(--muted);
  font-weight: 700;
  font-size: 13px;
  flex-shrink: 0;
  transition: all 120ms ease;
}

.answers li:hover .answer-key {
  border-color: rgba(124, 58, 237, 0.5);
  background: rgba(124, 58, 237, 0.1);
  color: var(--primary-2);
}

/* Selected state */
input[type="radio"]:checked + .answer-key {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
  box-shadow: 0 4px 12px rgba(124, 58, 237, 0.35);
}

.answer-text {
  flex: 1;
}

input[type="radio"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

input[type="radio"]:focus-visible + .answer-key {
  box-shadow: var(--focus);
}

.correct {
  color: var(--success);
  font-weight: 700;
}
.noanswer {
  color: var(--warning);
  border-color: rgba(245, 158, 11, 0.45);
}
.noanswer .answer-key {
  border-color: rgba(245, 158, 11, 0.5);
  color: var(--warning);
}
.incorrect {
  color: var(--danger);
  font-weight: 700;
}

#submit-btn,
#reset-btn {
  display: block;
  padding: 12px 18px;
  font-size: 15px;
  border: none;
  color: white;
  border-radius: 100px;
  cursor: pointer;
  background: var(--primary);
  box-shadow: 0 10px 30px rgba(124, 58, 237, 0.25);
  transition:
    transform 120ms ease,
    filter 120ms ease;
}

#submit-btn:hover,
#reset-btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.05);
}

#submit-btn:disabled,
#reset-btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
  filter: none;
}

#reset-btn {
  background: var(--danger);
  box-shadow: 0 10px 30px rgba(239, 68, 68, 0.22);
  white-space: nowrap;
  flex: 1;
  margin-top: 0;
  width: fit-content;
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 12px 16px 12px 12px;
  box-shadow: var(--shadow);
}
@media (max-width: 520px) {
  .topbar {
    border-radius: 16px !important;
    padding: 14px 14px 14px 14px !important;
  }
}

.title {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.title h1 {
  margin: 0;
  font-size: 20px;
  letter-spacing: 0.2px;
}

.title p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
  opacity: 0.7;
}

.filebox {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-start;
}

/* Custom file input (accessible) */
.file-input {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.file-picker {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 14px;
  border-radius: 100px;
  border: 1px dashed rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.06);
  cursor: pointer;
  user-select: none;
  color: white;
  font-size: 13px;
  font-weight: 500;
  transition:
    transform 120ms ease,
    background 120ms ease,
    border-color 120ms ease;
}

.file-picker:hover {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(167, 139, 250, 0.45);
}

.file-input:focus-visible + .file-picker {
  outline: none;
  box-shadow: var(--focus);
}

.file-picker.has-file {
  border-style: solid;
  border-color: var(--success);
  background: rgba(34, 197, 94, 0.1);
  color: var(--success);
}

.load-options {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.or-divider {
  color: var(--muted);
  opacity: 0.5;
  font-size: 13px;
  font-weight: 500;
}

.gist-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 20px;
  border-radius: 100px;
  border: 1px solid rgba(34, 197, 94, 0.4);
  background: rgba(34, 197, 94, 0.12);
  color: var(--success);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition:
    transform 120ms ease,
    background 120ms ease,
    border-color 120ms ease,
    box-shadow 120ms ease;
}

.gist-btn:hover {
  transform: translateY(-1px);
  background: rgba(34, 197, 94, 0.18);
  border-color: rgba(34, 197, 94, 0.6);
  box-shadow: 0 8px 24px rgba(34, 197, 94, 0.2);
}

.gist-btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

.gist-btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

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

.actions {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.jump-q {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  cursor: pointer;
  transition:
    transform 120ms ease,
    background 120ms ease,
    border-color 120ms ease,
    opacity 120ms ease;
  user-select: none;
}

.jump-q:hover {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(167, 139, 250, 0.45);
}

.jump-q:focus-visible {
  outline: none;
  box-shadow: var(--focus);
}

.results {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 14px;
  box-shadow: var(--shadow);
}

.results h2 {
  margin: 0 0 16px;
  font-size: 18px;
}

.score-main {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  padding: 24px 16px;
  background: rgb(124, 58, 237, 0.1);
  border: 1px solid rgba(124, 58, 237, 0.3);
  border-radius: 16px;
}

.score-percent {
  font-size: 56px;
  font-weight: 700;
  color: var(--primary);
}

.score-fraction {
  font-size: 16px;
  color: var(--muted);
  opacity: 0.8;
  font-weight: 500;
}

.stats-row {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.stat-card {
  flex: 1;
  min-width: 100px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 14px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.18);
}

.stat-value {
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
}

.stat-label {
  font-size: 12px;
  color: var(--muted);
  opacity: 0.8;
}

.stat-answered {
  border-color: rgba(34, 197, 94, 0.35);
  background: rgba(34, 197, 94, 0.08);
}

.stat-answered .stat-value {
  color: var(--success);
}

.stat-unanswered {
  border-color: rgba(245, 158, 11, 0.35);
  background: rgba(245, 158, 11, 0.08);
}

.stat-unanswered .stat-value {
  color: var(--warning);
}

.stat-wrong {
  border-color: rgba(239, 68, 68, 0.35);
  background: rgba(239, 68, 68, 0.08);
}

.stat-wrong .stat-value {
  color: var(--danger);
}

.results h3 {
  margin: 14px 0 8px;
  font-size: 15px;
  color: var(--text);
  opacity: 0.9;
}

.results p {
  margin: 6px 0;
  color: var(--muted);
  opacity: 0.7;
  line-height: 1.6;
}

.review-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.review-item {
  background: rgba(0, 0, 0, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: 10px 12px;
}

.review-item .q {
  color: var(--text);
  opacity: 0.9;
  margin: 0 0 8px;
  font-weight: 700;
}

.review-item .a {
  margin: 4px 0;
  color: var(--muted);
  opacity: 0.7;
}

.review-item .a strong {
  color: var(--text);
  opacity: 0.9;
}

.hint {
  color: var(--muted);
  font-size: 12px;
  opacity: 0.7;
}

/* Review Tabs Container */
.review-tabs-container {
  margin-top: 20px;
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  background: rgba(0, 0, 0, 0.15);
}

.review-tabs-header {
  display: flex;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.03);
}

.review-tab {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 16px;
  background: transparent;
  border: none;
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 150ms ease;
  position: relative;
}

.review-tab:not(:last-child) {
  border-left: 1px solid var(--border);
}

.review-tab:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
}

.review-tab:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.review-tab.active {
  background: rgba(124, 58, 237, 0.1);
  color: var(--primary-2);
}

.review-tab.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--primary);
  border-radius: 3px 3px 0 0;
}

.review-tab[data-tab="unanswered"].active {
  background: rgba(245, 158, 11, 0.1);
  color: var(--warning);
}

.review-tab[data-tab="unanswered"].active::after {
  background: var(--warning);
}

.review-tab[data-tab="wrong"].active {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
}

.review-tab[data-tab="wrong"].active::after {
  background: var(--danger);
}

.tab-icon {
  font-size: 16px;
}

.tab-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 24px;
  padding: 0 8px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.1);
  font-size: 12px;
  font-weight: 700;
}

.review-tab.active .tab-count {
  background: rgba(255, 255, 255, 0.15);
}

.review-tabs-content {
  padding: 16px;
}

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

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

.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
  gap: 10px;
}

.review-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 14px 10px;
  border-radius: 12px;
  cursor: pointer;
  transition:
    transform 150ms ease,
    background 150ms ease,
    border-color 150ms ease,
    box-shadow 150ms ease;
}

.review-card.unanswered-card {
  background: linear-gradient(
    145deg,
    rgba(245, 158, 11, 0.12),
    rgba(245, 158, 11, 0.06)
  );
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.review-card.unanswered-card:hover {
  transform: translateY(-2px);
  background: linear-gradient(
    145deg,
    rgba(245, 158, 11, 0.2),
    rgba(245, 158, 11, 0.12)
  );
  border-color: rgba(245, 158, 11, 0.5);
  box-shadow: 0 8px 20px rgba(245, 158, 11, 0.15);
}

.review-card.unanswered-card .review-card-num {
  color: var(--warning);
}

.review-card.wrong-card {
  background: linear-gradient(
    145deg,
    rgba(239, 68, 68, 0.12),
    rgba(239, 68, 68, 0.06)
  );
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.review-card.wrong-card:hover {
  transform: translateY(-2px);
  background: linear-gradient(
    145deg,
    rgba(239, 68, 68, 0.2),
    rgba(239, 68, 68, 0.12)
  );
  border-color: rgba(239, 68, 68, 0.5);
  box-shadow: 0 8px 20px rgba(239, 68, 68, 0.15);
}

.review-card.wrong-card .review-card-num {
  color: var(--danger);
}

.review-card.bookmark-card {
  background: linear-gradient(
    145deg,
    rgba(245, 158, 11, 0.13),
    rgba(124, 58, 237, 0.08)
  );
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.review-card.bookmark-card:hover {
  transform: translateY(-2px);
  border-color: rgba(245, 158, 11, 0.55);
  box-shadow: 0 8px 20px rgba(245, 158, 11, 0.14);
}

.review-card.bookmark-card .review-card-num {
  color: var(--warning);
}

.review-card:active {
  transform: translateY(0);
}

.review-card-num {
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
}

.review-card-label {
  font-size: 11px;
  color: var(--muted);
  opacity: 0.7;
}

.empty-tab {
  text-align: center;
  color: var(--muted);
  opacity: 0.7;
  padding: 24px;
  font-size: 14px;
}

.results-actions {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin: 0 0 16px;
  flex-wrap: wrap;
}

.result-action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 10px 16px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.07);
  color: var(--text);
  font-weight: 700;
  cursor: pointer;
  transition:
    transform 150ms ease,
    background 150ms ease,
    border-color 150ms ease,
    box-shadow 150ms ease;
}

.result-action-btn.primary {
  border-color: rgba(34, 197, 94, 0.4);
  background: rgba(34, 197, 94, 0.13);
  color: var(--success);
}

.result-action-btn:hover {
  transform: translateY(-2px);
  border-color: rgba(167, 139, 250, 0.5);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.22);
}

.saved-questions-panel,
.score-history {
  margin-top: 16px;
  padding: 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.15);
}

.saved-questions-panel h3,
.score-history h3 {
  margin-top: 0;
}

.score-history ol {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.history-item {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.04);
}

.history-subject,
.history-date {
  display: block;
}

.history-subject {
  color: var(--text);
  font-weight: 700;
}

.history-date,
.history-item span {
  color: var(--muted);
  opacity: 0.75;
  font-size: 12px;
}

.history-item strong {
  color: var(--success);
  font-size: 18px;
}

@media (max-width: 520px) {
  .review-tabs-header {
    flex-direction: column;
  }

  .review-tab:not(:last-child) {
    border-left: none;
    border-bottom: 1px solid var(--border);
  }

  .review-grid {
    grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
    gap: 8px;
  }

  .review-card {
    padding: 10px 8px;
  }

  .review-card-num {
    font-size: 18px;
  }

  .tab-text {
    font-size: 13px;
  }

  .history-item {
    grid-template-columns: 1fr auto;
  }

  .history-item > span {
    grid-column: 1 / -1;
  }
}

/* Share Result Button */
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: 100px;
  border: 1px solid rgba(124, 58, 237, 0.4);
  background: linear-gradient(
    135deg,
    rgba(124, 58, 237, 0.2),
    rgba(167, 139, 250, 0.15)
  );
  color: var(--primary-2);
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  transition:
    transform 150ms ease,
    background 150ms ease,
    border-color 150ms ease,
    box-shadow 150ms ease,
    opacity 200ms ease;
  margin-top: 12px;
  opacity: 0.5;
}

/* Hover on results container makes share button visible */
.results:hover .share-btn {
  opacity: 1;
}

.share-btn:hover {
  transform: translateY(-2px);
  background: linear-gradient(
    135deg,
    rgba(124, 58, 237, 0.3),
    rgba(167, 139, 250, 0.25)
  );
  border-color: rgba(167, 139, 250, 0.6);
  box-shadow: 0 8px 28px rgba(124, 58, 237, 0.3);
  opacity: 1;
}

.share-btn:active {
  transform: translateY(0);
}

.share-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.share-btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* Shareable Results Card (for screenshot) */
.share-card {
  position: relative;
  background: linear-gradient(145deg, #0d1525, #111b2e);
  border-radius: 20px;
  padding: 24px;
  overflow: hidden;
}

.share-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(
      600px 400px at 80% 10%,
      rgba(124, 58, 237, 0.25),
      transparent 60%
    ),
    radial-gradient(
      400px 300px at 20% 90%,
      rgba(34, 197, 94, 0.12),
      transparent 50%
    );
  pointer-events: none;
}

.share-card-content {
  position: relative;
  z-index: 1;
}

.share-card .share-title {
  text-align: center;
  font-size: 16px;
  font-weight: 600;
  color: var(--muted);
  opacity: 0.8;
  margin: 0 0 16px;
}

.share-card .score-main {
  margin-bottom: 16px;
}

.share-card .stats-row {
  margin-bottom: 0;
}

/* Watermark */
.watermark {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 6px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--muted);
  opacity: 0.6;
  font-size: 12px;
  font-weight: 500;
}

.watermark svg {
  width: 14px;
  height: 14px;
  opacity: 0.7;
}

@media (max-width: 520px) {
  .question h2 {
    font-size: 16px;
  }

  /* Question meta mobile layout */
  .question-meta {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .question-meta .meta-badges {
    justify-content: flex-start;
  }

  .question-meta .meta-status {
    justify-content: space-between;
    padding: 10px 12px;
    background: rgba(0, 0, 0, 0.25);
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.08);
  }

  .question-status {
    font-size: 12px !important;
    opacity: 0.8;
  }

  .timer-display {
    min-width: 48px;
    height: 34px;
    font-size: 14px;
  }

  .timer-btn {
    width: 34px;
    height: 34px;
  }

  .chapter-info-badge {
    padding: 4px 10px;
    font-size: 10px;
  }

  .badge {
    padding: 5px 10px;
    font-size: 11px;
  }

  /* Chapter progress mobile */
  .chapter-progress {
    gap: 5px;
    justify-content: center;
  }

  .chapter-dot {
    min-width: 36px;
    height: 30px;
    padding: 0 8px;
    font-size: 12px;
  }

  /* Chapter motivation mobile */
  .chapter-motivation {
    padding: 10px 12px;
    font-size: 13px;
    gap: 8px;
  }

  .chapter-motivation .motivation-emoji {
    font-size: 22px;
  }

  /* Chapter motivation mobile - full width toggle on own row */
  .chapter-motivation {
    flex-wrap: wrap;
    order: -1; /* Move to top */
  }

  .chapter-motivation .toggle-container {
    width: 100%;
    margin-right: 0;
    margin-top: 8px;
    justify-content: center;
    padding: 10px 14px;
  }

  /* Hide shortcuts bar on mobile */
  .shortcuts-bar {
    display: none !important;
  }

  /* Slides top mobile */
  .slides-top {
    flex-direction: column;
    gap: 12px;
  }

  /* Fixed navigation buttons at bottom for mobile */
  .slide-actions {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    justify-content: center;
    background: rgba(10, 16, 28, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 12px 16px;
    padding-bottom: calc(12px + env(safe-area-inset-bottom));
    border-top: 1px solid var(--border);
    z-index: 100;
    gap: 10px;
  }

  .nav-btn {
    padding: 14px 18px;
    font-size: 15px;
    width: fit-content;
    justify-content: center;
    min-height: 48px; /* Better touch target */
  }

  #finish-btn {
    margin-top: 0;
    width: fit-content;
  }

  /* When finish button is visible, make nav buttons smaller */
  .slide-actions:has(#finish-btn:not([style*="display: none"]))
    .nav-btn:not(#finish-btn) {
    flex: 1;
    padding: 14px 12px;
  }

  /* Progress meter mobile */
  .progress {
    width: 100%;
    flex-direction: column;
    gap: 8px;
    align-items: stretch;
  }

  .progress .meter {
    width: 100%;
  }

  .progress .badge {
    align-self: flex-start;
  }

  /* Question card mobile */
  .question {
    padding: 12px;
  }

  .answers li > label {
    padding: 12px 10px;
  }

  .choice {
    font-size: 14px;
  }
}

@media (max-width: 380px) {
  .question-meta .meta-badges {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .timer-container {
    gap: 6px;
  }

  .chapter-dot {
    min-width: 30px;
    height: 26px;
    font-size: 11px;
  }
}

/* Keyboard shortcuts bar (bottom) */
.shortcuts-bar {
  position: fixed;
  left: 50%;
  bottom: 14px;
  transform: translateX(-50%);
  width: min(1100px, 94vw);
  z-index: 50;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(10, 16, 28, 0.72);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.shortcuts-bar .shortcuts-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  opacity: 0.9;
  font-size: 12px;
  line-height: 1.5;
  text-align: center;
}

.shortcuts-bar .shortcuts-title {
  font-weight: 700;
  color: var(--text);
  opacity: 0.9;
}

.shortcuts-bar kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  padding: 2px 8px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  font-weight: 700;
  font-size: 12px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.2);
}

.shortcuts-bar .sep {
  opacity: 0.45;
}

/* Confirm dialog */
dialog.modal {
  width: min(560px, 92vw);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 0;
  background: rgba(14, 20, 34, 0.92);
  color: var(--text);
  box-shadow: var(--shadow);
}

dialog.modal::backdrop {
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(2px);
}

.modal-card {
  padding: 14px;
}

.modal-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.modal-card p {
  margin: 0 0 12px;
  color: var(--muted);
  opacity: 0.8;
  line-height: 1.6;
  font-size: 13px;
}

.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-start;
  flex-wrap: wrap;
}

.modal-actions .nav-btn {
  padding: 10px 14px;
}

/* Restore notification */
.restore-notification {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(-100px);
  padding: 12px 20px;
  border-radius: 12px;
  border: 1px solid rgba(34, 197, 94, 0.4);
  background: rgba(34, 197, 94, 0.15);
  color: var(--success);
  font-weight: 600;
  font-size: 14px;
  z-index: 100;
  opacity: 0;
  transition:
    transform 300ms ease,
    opacity 300ms ease;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.restore-notification.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* =============================================
   GAMIFICATION STYLES
   ============================================= */

/* Chapter Colors */
:root {
  --chapter-1: #7c3aed;
  --chapter-2: #3b82f6;
  --chapter-3: #22c55e;
  --chapter-4: #f59e0b;
  --chapter-5: #ec4899;
  --chapter-6: #06b6d4;
  --chapter-7: #10b981;
}

/* Chapter Progress Bar */
.chapter-progress {
  display: flex;
  gap: 6px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.chapter-dot {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 32px;
  padding: 0 10px;
  border-radius: 8px;
  border: 2px solid rgba(255, 255, 255, 0.15);
  background: rgba(0, 0, 0, 0.25);
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 200ms ease;
  opacity: 0.6;
}

.chapter-dot:hover {
  transform: translateY(-2px);
  opacity: 0.9;
}

.chapter-dot.active {
  opacity: 1;
  border-color: currentColor;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

.chapter-dot.completed {
  opacity: 1;
}

.chapter-dot.completed::after {
  content: " ✓";
  margin-right: 4px;
}

.chapter-dot[data-chapter="1"] {
  color: var(--chapter-1);
}
.chapter-dot[data-chapter="2"] {
  color: var(--chapter-2);
}
.chapter-dot[data-chapter="3"] {
  color: var(--chapter-3);
}
.chapter-dot[data-chapter="4"] {
  color: var(--chapter-4);
}
.chapter-dot[data-chapter="5"] {
  color: var(--chapter-5);
}
.chapter-dot[data-chapter="6"] {
  color: var(--chapter-6);
}
.chapter-dot[data-chapter="7"] {
  color: var(--chapter-7);
}

.chapter-dot.active[data-chapter="1"] {
  background: rgba(124, 58, 237, 0.2);
  border-color: var(--chapter-1);
}
.chapter-dot.active[data-chapter="2"] {
  background: rgba(59, 130, 246, 0.2);
  border-color: var(--chapter-2);
}
.chapter-dot.active[data-chapter="3"] {
  background: rgba(34, 197, 94, 0.2);
  border-color: var(--chapter-3);
}
.chapter-dot.active[data-chapter="4"] {
  background: rgba(245, 158, 11, 0.2);
  border-color: var(--chapter-4);
}
.chapter-dot.active[data-chapter="5"] {
  background: rgba(236, 72, 153, 0.2);
  border-color: var(--chapter-5);
}
.chapter-dot.active[data-chapter="6"] {
  background: rgba(6, 182, 212, 0.2);
  border-color: var(--chapter-6);
}

/* Timer */
.timer-container {
  display: flex;
  align-items: center;
  gap: 8px;
}

.timer-display {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 52px;
  height: 36px;
  padding: 0 12px;
  border-radius: 10px;
  border: 2px solid var(--success);
  background: rgba(34, 197, 94, 0.1);
  color: var(--success);
  font-size: 16px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  transition: all 300ms ease;
}

.timer-display.warning {
  border-color: var(--warning);
  background: rgba(245, 158, 11, 0.15);
  color: var(--warning);
  animation: timerPulse 1s ease infinite;
}

.timer-display.danger {
  border-color: var(--danger);
  background: rgba(239, 68, 68, 0.2);
  color: var(--danger);
  animation: timerPulse 0.5s ease infinite;
}

@keyframes timerPulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.timer-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.06);
  color: var(--muted);
  cursor: pointer;
  transition: all 150ms ease;
}

.timer-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text);
}

.timer-btn svg {
  width: 18px;
  height: 18px;
}

.timer-btn.paused {
  border-color: rgba(245, 158, 11, 0.4);
  background: rgba(245, 158, 11, 0.15);
  color: var(--warning);
}

/* Milestone Badge Notification */
.milestone-notification {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  padding: 24px 40px;
  border-radius: 20px;
  border: 2px solid rgba(124, 58, 237, 0.5);
  background: linear-gradient(
    145deg,
    rgba(124, 58, 237, 0.25),
    rgba(167, 139, 250, 0.15)
  );
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow:
    0 20px 60px rgba(0, 0, 0, 0.4),
    0 0 80px rgba(124, 58, 237, 0.3);
  z-index: 200;
  text-align: center;
  opacity: 0;
  pointer-events: none;
  transition: all 400ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.milestone-notification.show {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.milestone-notification .milestone-emoji {
  font-size: 56px;
  margin-bottom: 12px;
  display: block;
  animation: bounceEmoji 0.6s ease;
}

@keyframes bounceEmoji {
  0% {
    transform: scale(0) rotate(-20deg);
  }
  50% {
    transform: scale(1.3) rotate(10deg);
  }
  100% {
    transform: scale(1) rotate(0deg);
  }
}

.milestone-notification .milestone-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.milestone-notification .milestone-subtitle {
  font-size: 15px;
  color: var(--muted);
  opacity: 0.85;
}

/* Chapter Motivation */
.chapter-motivation {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.2);
  margin-bottom: 10px;
  font-size: 14px;
  color: var(--muted);
}

.chapter-motivation .motivation-emoji {
  font-size: 24px;
}

.chapter-motivation .motivation-text {
  flex: 1;
}

.chapter-motivation .chapter-label {
  font-weight: 700;
  color: var(--text);
}

/* Progress Bar Glow at Milestones */
.progress .meter.milestone-glow {
  box-shadow:
    0 0 20px currentColor,
    0 0 40px currentColor;
  border-color: currentColor;
}

.progress .meter.milestone-glow > span {
  box-shadow: 0 0 10px currentColor;
}

/* Chapter Complete Banner - Modern Card Design */
.chapter-complete-banner {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.9);
  width: min(420px, 90vw);
  padding: 0;
  border-radius: 24px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: linear-gradient(
    165deg,
    rgba(15, 23, 42, 0.98) 0%,
    rgba(30, 41, 59, 0.95) 100%
  );
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.05),
    0 25px 50px -12px rgba(0, 0, 0, 0.6),
    0 0 80px -20px var(--chapter-glow, rgba(124, 58, 237, 0.4));
  z-index: 250;
  text-align: center;
  opacity: 0;
  pointer-events: none;
  overflow: hidden;
  transition: all 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.chapter-complete-banner.show {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
  pointer-events: auto;
}

.chapter-complete-banner .banner-header {
  position: relative;
  padding: 32px 24px 20px;
  background: linear-gradient(
    180deg,
    var(--chapter-bg, rgba(124, 58, 237, 0.15)) 0%,
    transparent 100%
  );
}

.chapter-complete-banner .banner-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 120px;
  height: 4px;
  border-radius: 0 0 4px 4px;
  background: var(--chapter-accent, var(--primary));
}

.chapter-complete-banner .complete-emoji {
  font-size: 64px;
  margin-bottom: 12px;
  display: block;
  animation: celebrateEmoji 0.8s ease;
}

@keyframes celebrateEmoji {
  0% {
    transform: scale(0) rotate(-180deg);
  }
  50% {
    transform: scale(1.2) rotate(10deg);
  }
  70% {
    transform: scale(0.9) rotate(-5deg);
  }
  100% {
    transform: scale(1) rotate(0deg);
  }
}

.chapter-complete-banner .chapter-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 20px;
  background: var(--chapter-accent, var(--primary));
  color: white;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 12px;
  box-shadow: 0 4px 12px var(--chapter-shadow, rgba(124, 58, 237, 0.4));
}

.chapter-complete-banner h2 {
  margin: 0;
  font-size: 26px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.3;
}

.chapter-complete-banner .banner-body {
  padding: 20px 24px 28px;
}

.chapter-complete-banner .stats-mini {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 20px;
  padding: 16px;
  border-radius: 14px;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.chapter-complete-banner .stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.chapter-complete-banner .stat-item .stat-num {
  font-size: 28px;
  font-weight: 700;
  color: var(--chapter-accent, var(--primary));
  line-height: 1;
}

.chapter-complete-banner .stat-item .stat-label {
  font-size: 12px;
  color: var(--muted);
  opacity: 0.7;
}

.chapter-complete-banner .motivation-text {
  margin: 0 0 20px;
  font-size: 15px;
  color: var(--muted);
  opacity: 0.9;
  line-height: 1.5;
}

.chapter-complete-banner .continue-btn {
  width: 100%;
  padding: 16px 32px;
  border-radius: 14px;
  border: none;
  background: linear-gradient(
    135deg,
    var(--chapter-accent, var(--primary)),
    var(--chapter-accent-dark, #5b21b6)
  );
  color: white;
  font-weight: 700;
  font-size: 16px;
  cursor: pointer;
  box-shadow: 0 8px 24px var(--chapter-shadow, rgba(124, 58, 237, 0.35));
  transition: all 200ms ease;
}

.chapter-complete-banner .continue-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px var(--chapter-shadow, rgba(124, 58, 237, 0.45));
}

.chapter-complete-banner .continue-btn:active {
  transform: translateY(0);
}

/* Chapter Info Badge */
.chapter-info-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 8px;
  font-size: 11px;
  font-weight: 600;
  margin-right: 8px;
}

.chapter-info-badge[data-chapter="1"] {
  background: rgba(124, 58, 237, 0.2);
  color: var(--chapter-1);
}
.chapter-info-badge[data-chapter="2"] {
  background: rgba(59, 130, 246, 0.2);
  color: var(--chapter-2);
}
.chapter-info-badge[data-chapter="3"] {
  background: rgba(34, 197, 94, 0.2);
  color: var(--chapter-3);
}
.chapter-info-badge[data-chapter="4"] {
  background: rgba(245, 158, 11, 0.2);
  color: var(--chapter-4);
}
.chapter-info-badge[data-chapter="5"] {
  background: rgba(236, 72, 153, 0.2);
  color: var(--chapter-5);
}
.chapter-info-badge[data-chapter="6"] {
  background: rgba(6, 182, 212, 0.2);
  color: var(--chapter-6);
}
.chapter-info-badge[data-chapter="7"] {
  background: #10b98133;
  color: var(--chapter-7);
}

/* Subject Selection Buttons */
.subject-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.subject-btn {
  flex: 1;
  min-width: 140px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px 12px;
  border-radius: 14px;
  border: 2px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  cursor: pointer;
  transition: all 180ms ease;
}

.subject-btn:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
  background: rgba(124, 58, 237, 0.1);
  box-shadow: 0 8px 24px rgba(124, 58, 237, 0.2);
}

.subject-btn:active {
  transform: translateY(0);
}

.subject-btn .subject-icon {
  font-size: 32px;
}

.subject-btn .subject-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.subject-btn .subject-desc {
  font-size: 12px;
  color: var(--muted);
  opacity: 0.7;
}

.subject-btn.sde601:hover {
  border-color: var(--chapter-1);
  background: rgba(124, 58, 237, 0.15);
  box-shadow: 0 8px 24px rgba(124, 58, 237, 0.25);
}

.subject-btn.dnl601:hover {
  border-color: var(--chapter-2);
  background: rgba(59, 130, 246, 0.15);
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.25);
}

.subject-btn.sdb601:hover {
  border-color: var(--chapter-3);
  background: rgba(34, 197, 94, 0.15);
  box-shadow: 0 8px 24px rgba(34, 197, 94, 0.25);
}
.subject-btn.dpd601:hover {
  border-color: var(--chapter-4);
  background: rgba(245, 158, 11, 0.15);
  box-shadow: 0 8px 24px rgba(245, 158, 11, 0.25);
}
.subject-btn.bis601:hover {
  border-color: var(--chapter-5);
  background: rgba(236, 72, 153, 0.15);
  box-shadow: 0 8px 24px rgba(236, 72, 153, 0.25);
}
.subject-btn.ddv601:hover {
  border-color: var(--chapter-6);
  background: rgba(6, 182, 212, 0.15);
  box-shadow: 0 8px 24px rgba(6, 182, 212, 0.25);
}

/* Download button on subject-btn */
.subject-btn {
  position: relative;
}

.subject-download-btn {
  position: absolute;
  top: 6px;
  left: 6px;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.1);
  color: var(--muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 150ms ease;
  opacity: 0.7;
  z-index: 10;
}

.subject-download-btn:hover {
  opacity: 1;
  background: rgba(229, 213, 255, 0.1);
  border-color: var(white);
  color: white;
  transform: scale(1.01);
}

.subject-download-btn:active {
  transform: scale(0.95);
}

.subject-download-btn svg {
  width: 14px;
  height: 14px;
}

/* JSON Structure Info */
.json-structure-info {
  margin-top: 16px;
  border: 1px solid var(--border);
  border-radius: 10px;

  background: rgba(255, 255, 255, 0.02);
  overflow: hidden;
}

.json-structure-info summary {
  padding: 10px 14px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  opacity: 0.8;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 150ms ease;
}

.json-structure-info summary:hover {
  opacity: 1;
  background: rgba(255, 255, 255, 0.04);
}

.json-structure-info summary::marker {
  color: var(--primary);
}

.json-structure-info[open] summary {
  border-bottom: 1px solid var(--border);
}

.json-structure-content {
  padding: 12px 14px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
  opacity: 0.85;
  max-height: 200px;
  overflow-y: auto;
}

.json-structure-content ul {
  margin: 8px 0;
  padding-right: 20px;
  padding-left: 0;
}

.json-structure-content li {
  margin: 4px 0;
}

.json-structure-content code {
  background: rgba(124, 58, 237, 0.15);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  color: var(--primary-2);
}

.json-structure-content pre {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  padding-top: 36px;
  overflow-x: auto;
  font-size: 11px;
  line-height: 1.5;
  direction: ltr;
  text-align: left;
  position: relative;
}

.json-structure-content pre code {
  background: none;
  padding: 0;
  color: var(--text);
  opacity: 0.9;
}

.copy-code-btn {
  position: absolute;
  top: 6px;
  right: 6px;
  padding: 4px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.08);
  color: var(--muted);
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: all 150ms ease;
  opacity: 0.8;
}

.copy-code-btn:hover {
  opacity: 1;
  background: rgba(124, 58, 237, 0.2);
  border-color: var(--primary);
  color: white;
}

.copy-code-btn:active {
  transform: scale(0.95);
}

.copy-code-btn svg {
  width: 12px;
  height: 12px;
}

.copy-code-btn.copied {
  background: rgba(34, 197, 94, 0.2);
  border-color: var(--success);
  color: var(--success);
}

/* Multi-select badge */
.multi-select-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 8px;
  font-size: 11px;
  font-weight: 600;
  background: rgba(236, 72, 153, 0.2);
  color: #ec4899;
  border: 1px solid rgba(236, 72, 153, 0.3);
}

.multi-select-badge svg {
  width: 14px;
  height: 14px;
}

/* Checkbox styling for multi-select */
input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

input[type="checkbox"]:checked + .answer-key {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
  box-shadow: 0 4px 12px rgba(124, 58, 237, 0.35);
}

input[type="checkbox"]:focus-visible + .answer-key {
  box-shadow: var(--focus);
}

/* Submit multi-select button */
.submit-multi-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  margin-top: 12px;
  padding: 12px 20px;
  border-radius: 12px;
  border: 2px solid var(--primary);
  background: rgba(124, 58, 237, 0.15);
  color: var(--primary-2);
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  transition: all 150ms ease;
}

.submit-multi-btn:hover {
  background: var(--primary);
  color: white;
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(124, 58, 237, 0.3);
}

.submit-multi-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* Instant feedback toggle - compact style */
.toggle-container {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
  margin-right: auto;
  padding: 4px 10px;
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: all 150ms ease;
}

.toggle-container:hover {
  background: rgba(0, 0, 0, 0.3);
  border-color: rgba(255, 255, 255, 0.15);
}

.toggle-container input[type="checkbox"].toggle-switch {
  position: relative;
  opacity: 1;
  width: 36px;
  height: 20px;
  pointer-events: auto;
  appearance: none;
  -webkit-appearance: none;
  background: rgba(255, 255, 255, 0.1);
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-radius: 20px;
  cursor: pointer;
  transition: all 200ms ease;
  flex-shrink: 0;
}

.toggle-container input[type="checkbox"].toggle-switch::before {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.6);
  transition: all 200ms ease;
}

.toggle-container input[type="checkbox"].toggle-switch:checked {
  background: rgba(34, 197, 94, 0.3);
  border-color: var(--success);
}

.toggle-container input[type="checkbox"].toggle-switch:checked::before {
  left: 18px;
  background: var(--success);
}

.toggle-label {
  font-size: 12px;
  color: var(--muted);
  opacity: 0.9;
  white-space: nowrap;
}

/* Instant feedback styles */
.answers.instant-feedback li.feedback-correct {
  border-color: rgba(34, 197, 94, 0.5) !important;
  background: rgba(34, 197, 94, 0.12) !important;
}

.answers.instant-feedback li.feedback-correct .answer-key {
  background: var(--success) !important;
  border-color: var(--success) !important;
  color: white !important;
}

.answers.instant-feedback li.feedback-incorrect {
  border-color: rgba(239, 68, 68, 0.5) !important;
  background: rgba(239, 68, 68, 0.12) !important;
}

.answers.instant-feedback li.feedback-incorrect .answer-key {
  background: var(--danger) !important;
  border-color: var(--danger) !important;
  color: white !important;
}

.answers.instant-feedback li.feedback-correct label,
.answers.instant-feedback li.feedback-incorrect label {
  pointer-events: none;
}

.feedback-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  font-size: 12px;
  flex-shrink: 0;
  margin-right: 8px;
}

.feedback-icon.correct {
  background: var(--success);
  color: white;
}

.feedback-icon.incorrect {
  background: var(--danger);
  color: white;
}

/* Hero Title - SVU Quiz */
.hero-title {
  text-align: center;
  margin-bottom: 32px;
}

.hero-title.hidden {
  display: none;
}

.hero-title h1 {
  font-size: clamp(3rem, 14vw, 8rem);
  font-weight: 800;
  margin: 0;
  padding: 0;

  letter-spacing: -0.02em;
  -webkit-text-fill-color: transparent;
  color: unset;
  background: linear-gradient(to bottom, #fff 40%, #8800ff20);
  background-clip: text;
  -webkit-background-clip: text;
}

/* Locked question after instant feedback */
.question.feedback-locked .answers li {
  pointer-events: none;
  opacity: 0.85;
}

.question.feedback-locked .submit-multi-btn {
  display: none;
}