/* ORL101 Mini App — Main Stylesheet */
:root {
  --teal: #0D7377;
  --teal-light: #14A9AE;
  --teal-dark: #0A5C60;
  --gold: #C9A84C;
  --gold-light: #F0D080;
  --red: #E53935;
  --green: #43A047;
  --orange: #FB8C00;
  --bg: var(--tg-theme-bg-color, #ffffff);
  --bg-secondary: var(--tg-theme-secondary-bg-color, #f4f4f5);
  --text: var(--tg-theme-text-color, #1a1a2e);
  --text-hint: var(--tg-theme-hint-color, #6b7280);
  --text-link: var(--tg-theme-link-color, #0D7377);
  --btn-bg: var(--tg-theme-button-color, #0D7377);
  --btn-text: var(--tg-theme-button-text-color, #ffffff);
  --border: rgba(0,0,0,0.08);
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
  --radius: 14px;
  --radius-sm: 8px;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }

html { font-size: 16px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ── Navigation ─────────────────────────────────────────────────────────── */
.bottom-nav {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  background: var(--bg);
  border-top: 1px solid var(--border);
  display: flex;
  z-index: 100;
  padding-bottom: env(safe-area-inset-bottom);
  box-shadow: 0 -2px 8px rgba(0,0,0,0.06);
}

.nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 6px 2px 8px;
  cursor: pointer;
  border: none;
  background: none;
  color: var(--text-hint);
  font-size: 10px;
  font-family: var(--font);
  transition: color 0.2s;
  text-decoration: none;
  gap: 2px;
}

.nav-item.active { color: var(--teal); }
.nav-item .nav-icon { font-size: 20px; line-height: 1; }
.nav-item .nav-label { line-height: 1; }

/* ── Sections (pages) ───────────────────────────────────────────────────── */
.section {
  display: none;
  min-height: 100vh;
  padding-bottom: 80px;
}
.section.active { display: block; }

/* ── Header ─────────────────────────────────────────────────────────────── */
.page-header {
  background: var(--teal);
  color: white;
  padding: 20px 16px 16px;
  position: sticky;
  top: 0;
  z-index: 50;
}
.page-header h1 { font-size: 20px; font-weight: 700; }
.page-header p { font-size: 13px; opacity: 0.85; margin-top: 2px; }

/* ── Cards / tiles ──────────────────────────────────────────────────────── */
.card {
  background: var(--bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  overflow: hidden;
}

.card-list { display: flex; flex-direction: column; gap: 10px; padding: 12px; }

.chapter-card {
  background: var(--bg);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 14px;
  cursor: pointer;
  transition: all 0.15s;
  box-shadow: var(--shadow);
}
.chapter-card:active { transform: scale(0.98); opacity: 0.9; }

.chapter-num {
  width: 42px; height: 42px;
  background: var(--teal);
  color: white;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 15px;
  flex-shrink: 0;
}
.chapter-info { flex: 1; min-width: 0; }
.chapter-title { font-size: 14px; font-weight: 600; line-height: 1.3; }
.chapter-subtitle { font-size: 12px; color: var(--text-hint); margin-top: 2px; }
.chapter-badge {
  font-size: 11px; padding: 3px 8px;
  border-radius: 20px; font-weight: 600;
  flex-shrink: 0;
}
.badge-done { background: #DCFCE7; color: #16A34A; }
.badge-locked { background: #FEE2E2; color: #DC2626; }
.badge-progress { background: #FEF3C7; color: #D97706; }

/* ── Buttons ─────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius);
  border: none; cursor: pointer;
  font-size: 15px; font-weight: 600; font-family: var(--font);
  transition: all 0.15s;
  text-decoration: none;
}
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--teal); color: white; }
.btn-primary:hover { background: var(--teal-dark); }
.btn-secondary { background: var(--bg-secondary); color: var(--text); }
.btn-danger { background: var(--red); color: white; }
.btn-gold { background: var(--gold); color: white; }
.btn-full { width: 100%; }
.btn-sm { padding: 8px 16px; font-size: 13px; border-radius: var(--radius-sm); }

/* ── Quiz ────────────────────────────────────────────────────────────────── */
.quiz-container { padding: 16px; }

.question-progress {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 16px;
}
.progress-bar-wrap {
  flex: 1; height: 6px;
  background: var(--bg-secondary);
  border-radius: 10px; overflow: hidden;
}
.progress-bar-fill {
  height: 100%; background: var(--teal);
  border-radius: 10px; transition: width 0.3s ease;
}
.progress-label { font-size: 12px; color: var(--text-hint); white-space: nowrap; }

.question-card {
  background: var(--bg);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  margin-bottom: 16px;
}
.question-topic {
  font-size: 11px; color: var(--teal); font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 10px;
}
.question-text { font-size: 16px; font-weight: 600; line-height: 1.5; }

.options-list { display: flex; flex-direction: column; gap: 10px; }

.option-btn {
  width: 100%;
  background: var(--bg-secondary);
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  text-align: left;
  font-size: 14px; font-family: var(--font);
  cursor: pointer; transition: all 0.15s;
  display: flex; align-items: flex-start; gap: 10px;
  color: var(--text);
  line-height: 1.4;
}
.option-btn:active { transform: scale(0.99); }
.option-btn:hover { border-color: var(--teal-light); }
.option-btn.selected { border-color: var(--teal); background: rgba(13,115,119,0.08); }
.option-btn.correct { border-color: var(--green); background: rgba(67,160,71,0.1); color: #1B5E20; }
.option-btn.incorrect { border-color: var(--red); background: rgba(229,57,53,0.1); color: #B71C1C; }
.option-btn.reveal-correct { border-color: var(--green); background: rgba(67,160,71,0.08); }
.option-btn.disabled { cursor: default; }

.option-letter {
  width: 24px; height: 24px;
  background: rgba(0,0,0,0.07);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 12px;
  flex-shrink: 0;
}
.option-btn.correct .option-letter { background: var(--green); color: white; }
.option-btn.incorrect .option-letter { background: var(--red); color: white; }
.option-btn.reveal-correct .option-letter { background: var(--green); color: white; }

.explanation-box {
  background: linear-gradient(135deg, #EBF8F8 0%, #F0FFF4 100%);
  border-left: 4px solid var(--teal);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 14px 16px;
  margin-top: 16px;
  font-size: 14px; line-height: 1.6;
  color: var(--text);
}
.explanation-box strong { color: var(--teal); }

.quiz-timer {
  background: var(--teal);
  color: white;
  padding: 6px 14px;
  border-radius: 20px;
  font-weight: 700; font-size: 14px;
  display: flex; align-items: center; gap: 6px;
}
.quiz-timer.warning { background: var(--red); }

/* ── Score / Result ─────────────────────────────────────────────────────── */
.score-card {
  text-align: center;
  padding: 32px 24px;
  background: var(--bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  margin: 16px;
}
.score-emoji { font-size: 56px; margin-bottom: 12px; }
.score-value { font-size: 48px; font-weight: 800; color: var(--teal); }
.score-label { font-size: 14px; color: var(--text-hint); margin-bottom: 8px; }
.score-details { font-size: 13px; color: var(--text-hint); margin-top: 4px; }
.score-passed { color: var(--green); font-weight: 700; font-size: 16px; }
.score-failed { color: var(--red); font-weight: 700; font-size: 16px; }

/* ── Flashcards ─────────────────────────────────────────────────────────── */
.card-deck {
  position: relative;
  width: 100%;
  padding: 20px 16px;
}

.flashcard-wrapper {
  perspective: 1000px;
  cursor: pointer;
  user-select: none;
}

.flashcard {
  position: relative;
  width: 100%;
  min-height: 280px;
  transform-style: preserve-3d;
  transition: transform 0.5s ease;
  border-radius: var(--radius);
}

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

.fc-front, .fc-back {
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius);
  padding: 24px 20px;
  display: flex; flex-direction: column;
  min-height: 280px;
}

.fc-front {
  background: linear-gradient(135deg, var(--teal) 0%, var(--teal-light) 100%);
  color: white;
  justify-content: center; align-items: center; text-align: center;
}

.fc-back {
  background: var(--bg);
  border: 2px solid var(--teal);
  transform: rotateY(180deg);
  justify-content: flex-start;
}

.fc-category {
  font-size: 11px; text-transform: uppercase; letter-spacing: 1px;
  opacity: 0.8; margin-bottom: 16px; font-weight: 600;
}
.fc-front-text { font-size: 18px; font-weight: 700; line-height: 1.4; }
.fc-hint { font-size: 12px; opacity: 0.7; margin-top: 16px; }
.fc-back-label { font-size: 11px; color: var(--teal); font-weight: 600; text-transform: uppercase; margin-bottom: 10px; }
.fc-back-text { font-size: 15px; line-height: 1.6; color: var(--text); flex: 1; }

.fc-category-badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 11px; font-weight: 600;
  margin-bottom: 16px;
}
.badge-red-flag { background: rgba(229,57,53,0.15); color: var(--red); }
.badge-clinical-pearl { background: rgba(201,168,76,0.15); color: #9A6B00; }
.badge-emergency { background: rgba(229,57,53,0.2); color: var(--red); }
.badge-anatomy { background: rgba(13,115,119,0.15); color: var(--teal); }

.rating-row {
  display: flex; gap: 8px; margin-top: 16px;
}
.rating-btn {
  flex: 1; padding: 10px 4px;
  border-radius: var(--radius-sm);
  border: none; cursor: pointer;
  font-size: 12px; font-weight: 600; font-family: var(--font);
  transition: all 0.15s;
}
.rating-btn:active { transform: scale(0.96); }
.rating-again { background: #FEE2E2; color: #DC2626; }
.rating-hard { background: #FEF3C7; color: #D97706; }
.rating-good { background: #DCFCE7; color: #16A34A; }
.rating-easy { background: #DBEAFE; color: #1D4ED8; }

.card-counter {
  text-align: center; font-size: 13px; color: var(--text-hint);
  padding: 8px 0 16px;
}

.fc-filter-row {
  display: flex; gap: 8px; overflow-x: auto;
  padding: 12px 16px; -ms-overflow-style: none; scrollbar-width: none;
}
.fc-filter-row::-webkit-scrollbar { display: none; }

.filter-chip {
  padding: 6px 14px;
  border-radius: 20px;
  border: 1.5px solid var(--border);
  background: var(--bg);
  font-size: 13px; font-weight: 500;
  cursor: pointer; white-space: nowrap;
  transition: all 0.15s; font-family: var(--font);
  color: var(--text);
}
.filter-chip.active {
  background: var(--teal); color: white; border-color: var(--teal);
}

/* ── Course ──────────────────────────────────────────────────────────────── */
.progress-overview {
  background: linear-gradient(135deg, var(--teal) 0%, var(--teal-dark) 100%);
  color: white;
  padding: 20px 16px;
}
.progress-overview h2 { font-size: 18px; font-weight: 700; }
.progress-overview p { font-size: 13px; opacity: 0.85; margin-top: 2px; }
.progress-ring-wrap {
  display: flex; align-items: center; gap: 16px; margin-top: 14px;
}
.progress-circle {
  width: 72px; height: 72px;
  position: relative; flex-shrink: 0;
}
.progress-circle svg { transform: rotate(-90deg); }
.progress-circle-text {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  font-size: 16px; font-weight: 800; color: white;
}
.progress-stats { font-size: 13px; }
.progress-stats strong { font-size: 20px; font-weight: 800; }

/* Chapter content reader */
/* ── Sub-topic cards ────────────────────────────────────────────────── */
.subtopic-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.15s;
  -webkit-tap-highlight-color: transparent;
}
.subtopic-card:active { background: var(--bg-secondary); }

.subtopic-icon {
  font-size: 24px;
  width: 42px; height: 42px;
  border-radius: 10px;
  background: var(--bg-secondary);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}

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

.subtopic-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.subtopic-meta {
  font-size: 12px;
  color: var(--text-hint);
  margin-top: 2px;
}

.subtopic-arrow {
  font-size: 20px;
  color: var(--text-hint);
  flex-shrink: 0;
}

.chapter-reader { padding: 16px; }

.chapter-content-box {
  background: var(--bg);
  border-radius: var(--radius);
  padding: 20px 18px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  font-size: 15px;
  line-height: 1.85;
  word-break: break-word;
  color: var(--text);
}

/* ── Rendered content (shared by chapter-content-box & subtopic-content) ── */
.chapter-content-box,
.subtopic-content {
  font-size: 15px;
  line-height: 1.9;
  color: var(--text);
  letter-spacing: 0.01em;
}

.chapter-content-box h1, .subtopic-content h1 {
  font-size: 20px; font-weight: 800;
  color: var(--teal-dark);
  margin: 32px 0 14px;
  padding: 10px 14px;
  background: linear-gradient(135deg, #EBF8F8, #E0F7FA);
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--teal);
}
.chapter-content-box h1:first-child, .subtopic-content h1:first-child { margin-top: 0; }

.chapter-content-box h2, .subtopic-content h2 {
  font-size: 17px; font-weight: 700;
  color: var(--teal);
  margin: 28px 0 10px;
  padding-bottom: 6px;
  border-bottom: 2px solid rgba(13,115,119,0.15);
}

.chapter-content-box h3, .subtopic-content h3 {
  font-size: 15px; font-weight: 700;
  color: #2d3748;
  margin: 22px 0 8px;
  padding-left: 10px;
  border-left: 3px solid var(--teal-light);
}

.chapter-content-box h4, .subtopic-content h4 {
  font-size: 14px; font-weight: 600;
  color: var(--teal-dark);
  margin: 16px 0 6px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  font-size: 12px;
}

.chapter-content-box p, .subtopic-content p {
  margin: 0 0 16px;
  line-height: 1.9;
}

.chapter-content-box ul, .subtopic-content ul,
.chapter-content-box ol, .subtopic-content ol {
  margin: 8px 0 18px;
  padding-left: 20px;
}

.chapter-content-box li, .subtopic-content li {
  margin-bottom: 8px;
  line-height: 1.75;
  padding-left: 4px;
}

.chapter-content-box ul > li::marker, .subtopic-content ul > li::marker {
  color: var(--teal);
  font-size: 18px;
}

.chapter-content-box ol > li::marker, .subtopic-content ol > li::marker {
  color: var(--teal);
  font-weight: 700;
}

.chapter-content-box strong, .subtopic-content strong,
.chapter-content-box b, .subtopic-content b {
  font-weight: 700;
  color: #1a1a2e;
}

.chapter-content-box em, .subtopic-content em,
.chapter-content-box i, .subtopic-content i {
  font-style: italic;
  color: #555;
}

.chapter-content-box blockquote, .subtopic-content blockquote {
  border-left: 4px solid var(--teal);
  background: linear-gradient(135deg, #EBF8F8 0%, #F0FFF4 100%);
  margin: 18px 0;
  padding: 14px 18px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: #333;
  font-size: 14px;
  line-height: 1.8;
}

.chapter-content-box code, .subtopic-content code {
  background: rgba(13,115,119,0.08);
  padding: 2px 7px;
  border-radius: 4px;
  font-size: 13px;
  font-family: 'SF Mono', Menlo, monospace;
  color: var(--teal-dark);
}

.chapter-content-box pre, .subtopic-content pre {
  background: #f8f9fa;
  color: #2d3748;
  padding: 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  overflow-x: auto;
  margin: 14px 0;
  font-size: 13px;
  line-height: 1.6;
}
.chapter-content-box pre code, .subtopic-content pre code {
  background: none; padding: 0; color: inherit;
}

.chapter-content-box table, .subtopic-content table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 18px 0;
  font-size: 13px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border);
  display: table;
}

.chapter-content-box thead, .subtopic-content thead {
  background: var(--teal);
  color: white;
}

.chapter-content-box th, .subtopic-content th {
  padding: 10px 14px;
  text-align: left;
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.3px;
}

.chapter-content-box td, .subtopic-content td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
  line-height: 1.6;
}

.chapter-content-box tbody tr:nth-child(even), .subtopic-content tbody tr:nth-child(even) {
  background: rgba(13,115,119,0.03);
}

.chapter-content-box hr, .subtopic-content hr {
  border: none;
  height: 0;
  margin: 8px 0;
}

.chapter-content-box img, .subtopic-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  margin: 14px 0;
  box-shadow: var(--shadow);
}

/* ── Trivia Game ──────────────────────────────────────────────────────────── */
.trivia-hero {
  background: linear-gradient(135deg, #1A1A2E 0%, #16213E 50%, #0F3460 100%);
  color: white;
  padding: 28px 20px 24px;
  text-align: center;
}

.trivia-info-row {
  display: flex;
  gap: 10px;
  padding: 14px 16px;
}
.trivia-info-card {
  flex: 1;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  padding: 14px 8px;
  text-align: center;
  border: 1px solid var(--border);
}

/* HUD */
.trivia-hud {
  background: linear-gradient(135deg, #1A1A2E, #0F3460);
  color: white;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  gap: 8px;
}
.trivia-lives { font-size: 18px; letter-spacing: 2px; }
.trivia-score-display { text-align: center; }
.trivia-score-num { font-size: 26px; font-weight: 900; color: var(--gold); }
.trivia-streak-display { text-align: center; display: flex; flex-direction: column; align-items: center; }

/* Question */
.trivia-q-wrap {
  padding: 16px 16px 8px;
}
.trivia-q-num {
  font-size: 11px; font-weight: 700; color: var(--teal);
  text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 8px;
}
.trivia-question {
  font-size: 17px; font-weight: 700; line-height: 1.45;
  color: var(--text);
}

/* Options */
.trivia-options {
  display: flex; flex-direction: column; gap: 8px;
  padding: 8px 16px 80px;
}
.trivia-opt-btn {
  width: 100%;
  background: var(--bg-secondary);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 14px;
  text-align: left;
  font-size: 14px; font-family: var(--font);
  cursor: pointer; transition: all 0.12s;
  display: flex; align-items: flex-start; gap: 10px;
  color: var(--text);
  line-height: 1.4;
}
.trivia-opt-btn:active { transform: scale(0.98); }
.trivia-opt-btn:disabled { cursor: default; }
.trivia-opt-letter {
  width: 26px; height: 26px;
  background: rgba(0,0,0,0.08); border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 12px; flex-shrink: 0;
}
.trivia-opt-text { flex: 1; }
.trivia-correct {
  border-color: var(--green) !important;
  background: rgba(67,160,71,0.12) !important;
  animation: trivia-flash-green 0.3s ease;
}
.trivia-correct .trivia-opt-letter { background: var(--green); color: white; }
.trivia-wrong {
  border-color: var(--red) !important;
  background: rgba(229,57,53,0.12) !important;
  animation: trivia-shake 0.4s ease;
}
.trivia-wrong .trivia-opt-letter { background: var(--red); color: white; }

@keyframes trivia-flash-green {
  0% { background: rgba(67,160,71,0.5) !important; }
  100% { background: rgba(67,160,71,0.12) !important; }
}
@keyframes trivia-shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

/* Feedback flash */
.trivia-feedback {
  position: fixed;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 52px;
  font-weight: 900;
  pointer-events: none;
  z-index: 200;
  animation: feedback-pop 0.9s ease forwards;
}
.feedback-correct { color: var(--green); }
.feedback-wrong { color: var(--red); }
@keyframes feedback-pop {
  0% { opacity: 0; transform: translate(-50%, -50%) scale(0.5); }
  30% { opacity: 1; transform: translate(-50%, -50%) scale(1.2); }
  60% { opacity: 1; transform: translate(-50%, -50%) scale(1); }
  100% { opacity: 0; transform: translate(-50%, -60%) scale(0.8); }
}

/* Leaderboard */
.trivia-lb-entry {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.trivia-lb-entry:last-child { border-bottom: none; }
.trivia-lb-rank { font-size: 22px; width: 32px; text-align: center; flex-shrink: 0; }
.trivia-lb-name { flex: 1; font-size: 14px; font-weight: 600; }
.trivia-lb-score { font-size: 18px; font-weight: 800; color: var(--teal); }

/* Ask Book button */
.ask-book-btn {
  background: linear-gradient(135deg, #1A1A2E, #0F3460);
  color: white;
  border-radius: var(--radius);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 700;
}
.ask-book-btn:hover { opacity: 0.9; }

/* ── AI Chat ──────────────────────────────────────────────────────────────── */
.chat-sheet {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  z-index: 300;
}
.chat-header {
  background: var(--teal);
  color: white;
  display: flex;
  align-items: center;
  padding: 12px 16px;
  gap: 8px;
  padding-top: calc(12px + env(safe-area-inset-top));
}
.chat-close-btn {
  width: 32px; height: 32px;
  background: rgba(255,255,255,0.2);
  border: none; border-radius: 50%;
  color: white; font-size: 14px;
  cursor: pointer; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
}
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.chat-msg { display: flex; }
.chat-msg-user { justify-content: flex-end; }
.chat-msg-ai { justify-content: flex-start; }
.chat-bubble {
  max-width: 85%;
  padding: 10px 14px;
  border-radius: 18px;
  font-size: 14px;
  line-height: 1.55;
}
.chat-msg-user .chat-bubble {
  background: var(--teal);
  color: white;
  border-bottom-right-radius: 4px;
}
.chat-msg-ai .chat-bubble {
  background: var(--bg-secondary);
  color: var(--text);
  border-bottom-left-radius: 4px;
  border: 1px solid var(--border);
}
.chat-input-wrap {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  padding: 10px 12px;
  padding-bottom: calc(10px + env(safe-area-inset-bottom));
  border-top: 1px solid var(--border);
  background: var(--bg);
}
.chat-input {
  flex: 1;
  background: var(--bg-secondary);
  border: 1.5px solid var(--border);
  border-radius: 20px;
  padding: 10px 14px;
  font-size: 14px; font-family: var(--font);
  outline: none; resize: none;
  color: var(--text);
  max-height: 120px;
  line-height: 1.4;
}
.chat-input:focus { border-color: var(--teal); }
.chat-send-btn {
  width: 40px; height: 40px;
  padding: 0;
  border-radius: 50%;
  font-size: 16px;
  flex-shrink: 0;
}

/* ── Home screen ──────────────────────────────────────────────────────────── */
.home-hero {
  background: linear-gradient(135deg, var(--teal) 0%, #1A8E93 50%, var(--teal-dark) 100%);
  color: white;
  padding: 28px 20px 24px;
  text-align: center;
}
.home-hero-logo { font-size: 48px; margin-bottom: 8px; }
.home-hero h1 { font-size: 24px; font-weight: 800; letter-spacing: -0.5px; }
.home-hero p { font-size: 13px; opacity: 0.85; margin-top: 6px; line-height: 1.5; }
.home-hero-name { font-size: 12px; opacity: 0.7; margin-top: 10px; }

.mode-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 12px; padding: 16px;
}
.mode-card {
  background: var(--bg);
  border-radius: var(--radius);
  padding: 20px 14px;
  text-align: center;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: all 0.15s;
}
.mode-card:active { transform: scale(0.97); }
.mode-icon { font-size: 32px; margin-bottom: 8px; }
.mode-title { font-size: 14px; font-weight: 700; }
.mode-desc { font-size: 11px; color: var(--text-hint); margin-top: 4px; line-height: 1.4; }

.user-greeting {
  padding: 12px 16px 4px;
  font-size: 15px; font-weight: 600;
}

/* ── Loading / states ──────────────────────────────────────────────────────── */
.loading-spinner {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 48px 16px; gap: 12px;
  color: var(--text-hint);
}
.spinner {
  width: 32px; height: 32px;
  border: 3px solid var(--bg-secondary);
  border-top-color: var(--teal);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.empty-state {
  text-align: center; padding: 48px 24px;
  color: var(--text-hint);
}
.empty-state-icon { font-size: 48px; margin-bottom: 12px; }
.empty-state p { font-size: 14px; line-height: 1.6; }

/* ── Toast notifications ─────────────────────────────────────────────────── */
.toast {
  position: fixed; bottom: 90px; left: 50%; transform: translateX(-50%);
  background: rgba(0,0,0,0.85);
  color: white;
  padding: 10px 20px;
  border-radius: 20px;
  font-size: 14px;
  z-index: 9999;
  pointer-events: none;
  white-space: nowrap;
  animation: toastIn 0.3s ease;
}
.toast.success { background: rgba(67,160,71,0.92); }
.toast.error { background: rgba(229,57,53,0.92); }
@keyframes toastIn {
  from { opacity: 0; transform: translateX(-50%) translateY(10px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ── Modal ───────────────────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(0,0,0,0.5);
  display: flex; align-items: flex-end; justify-content: center;
  animation: fadeIn 0.2s;
}
.modal-overlay.hidden { display: none; }

.modal-sheet {
  background: var(--bg);
  border-radius: 20px 20px 0 0;
  padding: 20px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUp 0.3s ease;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}

.modal-handle {
  width: 40px; height: 4px;
  background: var(--border);
  border-radius: 2px;
  margin: 0 auto 16px;
}

/* ── Form elements ────────────────────────────────────────────────────────── */
.form-group { margin-bottom: 14px; }
.form-label { font-size: 13px; font-weight: 600; margin-bottom: 6px; display: block; }
.form-input, .form-textarea, .form-select {
  width: 100%;
  background: var(--bg-secondary);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 14px; font-family: var(--font);
  color: var(--text);
  outline: none; transition: border-color 0.15s;
}
.form-input:focus, .form-textarea:focus, .form-select:focus { border-color: var(--teal); }
.form-textarea { resize: vertical; min-height: 80px; }

/* ── Quiz setup ───────────────────────────────────────────────────────────── */
.setup-card {
  background: var(--bg);
  border-radius: var(--radius);
  padding: 20px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  margin: 12px;
}
.setup-title { font-size: 17px; font-weight: 700; margin-bottom: 16px; }
.num-selector {
  display: flex; align-items: center; gap: 16px;
  justify-content: center;
}
.num-btn {
  width: 40px; height: 40px;
  background: var(--bg-secondary);
  border: none; border-radius: 50%;
  font-size: 20px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font);
}
.num-display { font-size: 24px; font-weight: 800; min-width: 60px; text-align: center; }

/* ── Utility ─────────────────────────────────────────────────────────────── */
.text-center { text-align: center; }
.mt-8 { margin-top: 8px; }
.mt-12 { margin-top: 12px; }
.mt-16 { margin-top: 16px; }
.p-16 { padding: 16px; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.hidden { display: none !important; }
.divider { height: 1px; background: var(--border); margin: 8px 0; }

/* ── In Action ────────────────────────────────────────────────────────── */
.action-hero-card {
  background: linear-gradient(135deg, #1a1a2e, #16213e);
  border-radius: var(--radius);
  padding: 18px 16px;
  display: flex; align-items: center; gap: 14px;
  cursor: pointer;
  transition: all 0.15s;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}
.action-hero-card:active { transform: scale(0.98); opacity: 0.9; }

.action-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.action-cat-card {
  background: var(--bg);
  border-radius: var(--radius);
  padding: 18px 14px;
  text-align: center;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: all 0.15s;
}
.action-cat-card:active { transform: scale(0.97); }
.action-cat-icon { font-size: 28px; margin-bottom: 6px; }
.action-cat-title { font-size: 13px; font-weight: 700; }
.action-cat-count { font-size: 11px; color: var(--text-hint); margin-top: 2px; }

.action-guide-card {
  background: var(--bg);
  border-radius: var(--radius);
  padding: 14px 16px;
  display: flex; align-items: center; gap: 12px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: all 0.15s;
}
.action-guide-card:active { transform: scale(0.98); }
.action-guide-icon { font-size: 22px; }
.action-guide-title { font-size: 14px; font-weight: 600; flex:1; }
.action-guide-badge {
  font-size: 10px; padding: 2px 8px;
  background: rgba(13,115,119,0.1); color: var(--teal);
  border-radius: 10px; font-weight: 600;
}

/* Safe area */
.safe-bottom { padding-bottom: calc(80px + env(safe-area-inset-bottom)); }

/* ── Clinical Simulation (Cases) ─────────────────────────────────────────── */
.cases-header {
  background: linear-gradient(135deg, #1a2a4a 0%, #0D7377 100%);
}

.cases-stats-row {
  display: flex;
  gap: 10px;
  padding: 0 16px 16px;
}

.cases-stat-card {
  flex: 1;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  padding: 12px 10px;
  text-align: center;
  border: 1px solid var(--border);
}

.cases-stat-value {
  font-size: 22px;
  font-weight: 800;
  color: var(--teal);
}

.cases-stat-label {
  font-size: 11px;
  color: var(--text-hint);
  margin-top: 2px;
}

/* Mode buttons */
.cases-mode-btn {
  flex: 1;
  padding: 16px 12px;
  border-radius: var(--radius);
  text-align: center;
  color: white;
  border: 2px solid transparent;
  cursor: pointer;
  transition: opacity 0.2s, border-color 0.2s;
  background: linear-gradient(135deg, var(--teal), var(--teal-light));
}

.cases-mode-btn:nth-child(2) {
  background: linear-gradient(135deg, #1a2a4a, #2d4a7a);
}

.cases-mode-btn.active-mode {
  border-color: white;
  box-shadow: 0 0 0 2px var(--teal);
}

.cases-mode-btn:active { opacity: 0.8; }

/* Case card in list */
.cases-card {
  background: var(--bg-secondary);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: transform 0.1s;
}

.cases-card:active { transform: scale(0.98); }

.cases-card-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  flex: 1;
  line-height: 1.3;
}

.cases-card-complaint {
  font-size: 12px;
  color: var(--text-hint);
  margin-top: 4px;
  line-height: 1.4;
}

.cases-diff-badge {
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 600;
}

.cases-diff-badge.easy  { background: rgba(67,160,71,0.12);  color: var(--green); }
.cases-diff-badge.medium { background: rgba(251,140,0,0.12); color: var(--orange); }
.cases-diff-badge.hard  { background: rgba(229,57,53,0.12);  color: var(--red); }

.cases-badge {
  font-size: 10px;
  padding: 3px 10px;
  border-radius: 12px;
  font-weight: 700;
  white-space: nowrap;
  flex-shrink: 0;
}

.cases-badge-pass  { background: rgba(67,160,71,0.15);   color: var(--green); }
.cases-badge-tried { background: rgba(251,140,0,0.15);   color: var(--orange); }
.cases-badge-new   { background: rgba(13,115,119,0.12);  color: var(--teal); }

/* Play view */
.cases-play-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: linear-gradient(135deg, #1a2a4a, #0D7377);
  color: white;
  position: sticky;
  top: 0;
  z-index: 20;
  min-height: 58px;
  flex-shrink: 0;
}

.cases-back-btn {
  background: none;
  border: none;
  color: white;
  font-size: 22px;
  cursor: pointer;
  padding: 0;
  line-height: 1;
}

/* Timer */
.cases-timer {
  font-size: 16px;
  font-weight: 800;
  color: white;
  min-width: 52px;
  text-align: center;
  padding: 4px 8px;
  border-radius: 8px;
  background: rgba(255,255,255,0.15);
  transition: background 0.3s, color 0.3s;
}

.cases-timer.warning {
  background: rgba(251,140,0,0.3);
  color: #FFD54F;
}

.cases-timer.danger {
  background: rgba(229,57,53,0.4);
  color: #FFCDD2;
  animation: pulse-timer 1s ease-in-out infinite;
}

@keyframes pulse-timer {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.6; }
}

/* Patient info bar */
.cases-patient-bar {
  background: linear-gradient(135deg, #0d1b2a, #1a2a4a);
  color: rgba(255,255,255,0.9);
  font-size: 12px;
  font-weight: 600;
  padding: 8px 16px;
  letter-spacing: 0.3px;
  flex-shrink: 0;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

/* Progress dots */
.cases-progress-dots {
  display: flex;
  gap: 5px;
  padding: 10px 16px 4px;
  flex-wrap: wrap;
  min-height: 24px;
  flex-shrink: 0;
}

.cases-progress-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border);
  transition: background 0.2s;
}

.cases-progress-dot.active {
  background: var(--teal);
}

/* Red flag banner */
.cases-red-flag {
  margin: 8px 16px;
  padding: 12px 16px;
  background: linear-gradient(135deg, #b71c1c, #e53935);
  color: white;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.5;
}

@keyframes redflag-in {
  0%   { transform: scale(0.93); opacity: 0; }
  60%  { transform: scale(1.02); }
  100% { transform: scale(1);    opacity: 1; }
}

.animate-redflag { animation: redflag-in 0.5s ease forwards; }

/* Narrative card */
.cases-narrative-card {
  margin: 10px 16px;
  padding: 16px;
  background: linear-gradient(135deg, #0d1b2a, #1a2a4a);
  color: white;
  border-radius: var(--radius);
  border-left: 4px solid var(--teal-light);
}

.cases-narrative-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  opacity: 0.7;
  margin-bottom: 10px;
}

/* Options */
.cases-options-list {
  padding: 8px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.cases-option-btn {
  width: 100%;
  padding: 16px;
  background: var(--bg-secondary);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  text-align: left;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  line-height: 1.5;
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
}

.cases-option-btn:active {
  border-color: var(--teal);
  background: rgba(13,115,119,0.08);
  transform: scale(0.98);
}

/* Pass screen */
.cases-pass-screen {
  position: relative;
  overflow: hidden;
  margin: 16px;
  padding: 28px 20px 20px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, #0D7377, #43A047);
  color: white;
  text-align: center;
}

.cases-pass-emoji { font-size: 56px; line-height: 1; margin-bottom: 8px; }

.cases-pass-title {
  font-size: 24px;
  font-weight: 900;
  margin-bottom: 8px;
}

.cases-pass-score {
  font-size: 18px;
  font-weight: 700;
  background: rgba(255,255,255,0.2);
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  margin: 8px 0 12px;
}

.cases-pass-summary {
  font-size: 13px;
  line-height: 1.6;
  text-align: left;
  background: rgba(0,0,0,0.15);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  margin-bottom: 10px;
}

/* Fail screen */
.cases-fail-screen {
  margin: 16px;
  padding: 24px 20px 20px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, #b71c1c, #c62828);
  color: white;
  text-align: center;
}

.cases-fail-emoji { font-size: 48px; line-height: 1; margin-bottom: 8px; }

.cases-fail-title {
  font-size: 22px;
  font-weight: 900;
  margin-bottom: 10px;
}

.cases-fail-narrative {
  font-size: 13px;
  line-height: 1.6;
  background: rgba(0,0,0,0.15);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  margin-bottom: 10px;
  text-align: left;
}

/* Shared learning box */
.cases-learning-box {
  font-size: 12px;
  line-height: 1.65;
  background: rgba(255,255,255,0.15);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  margin-bottom: 10px;
  text-align: left;
}

/* Shake animation for fail */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%       { transform: translateX(-8px); }
  50%       { transform: translateX(8px); }
  75%       { transform: translateX(-4px); }
}

.shake { animation: shake 0.6s ease; }

/* Confetti dots */
@keyframes confetti-fall {
  0%   { transform: translateY(0) rotate(0deg);   opacity: 1; }
  100% { transform: translateY(280px) rotate(720deg); opacity: 0; }
}

/* ── In Action — Hospital Survival Guide ──────────────────────────────────── */
.action-hero-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, #1a1a2e 0%, #0d4f52 100%);
  cursor: pointer;
  transition: opacity 0.2s;
}
.action-hero-card:active { opacity: 0.85; }

.action-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.action-cat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px 12px;
  border-radius: var(--radius);
  background: var(--bg-secondary);
  border: 1.5px solid var(--border);
  cursor: pointer;
  text-align: center;
  transition: border-color 0.2s, background 0.2s;
  gap: 6px;
}
.action-cat-card:active { border-color: var(--teal); background: rgba(13,115,119,0.08); }

.action-cat-icon { font-size: 36px; line-height: 1; }
.action-cat-title { font-size: 13px; font-weight: 700; color: var(--text); }
.action-cat-count { font-size: 11px; color: var(--text-hint); }

.action-guide-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  background: var(--bg);
  transition: background 0.15s;
}
.action-guide-card:active { background: var(--bg-secondary); }
.action-guide-icon { font-size: 22px; flex-shrink: 0; }
.action-guide-title { flex: 1; font-size: 14px; font-weight: 600; color: var(--text); }
.action-guide-badge {
  font-size: 10px;
  background: rgba(13,115,119,0.12);
  color: var(--teal);
  border-radius: 8px;
  padding: 2px 7px;
  white-space: nowrap;
}

.card-list { background: var(--bg); }

.btn-sm {
  padding: 6px 14px;
  font-size: 13px;
  border-radius: var(--radius-sm);
}