:root {
  --bg: #0b0f14;
  --bg-1: #11161d;
  --bg-2: #161d26;
  --surface: #1b2430;
  --surface-2: #222d3b;
  --border: #2a3748;
  --text: #e8eef6;
  --text-dim: #95a3b5;
  --text-faint: #6a7890;
  --accent: #5eead4;
  --accent-2: #60a5fa;
  --accent-warm: #f59e0b;
  --red: #f87171;
  --green: #34d399;
  --yellow: #facc15;
  --radius: 10px;
  --shadow: 0 6px 24px rgba(0,0,0,.35);
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, Segoe UI, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--text); font-family: var(--sans); font-size: 15px; line-height: 1.55; }
a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }
button { font-family: inherit; font-size: 14px; cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: .5; }

#app { display: grid; grid-template-columns: 320px 1fr; height: 100vh; }

#sidebar {
  background: var(--bg-1);
  border-right: 1px solid var(--border);
  display: flex; flex-direction: column;
  overflow: hidden;
}

.brand { display: flex; align-items: center; gap: 12px; padding: 18px 20px; border-bottom: 1px solid var(--border); }
.brand-mark { width: 36px; height: 36px; border-radius: 8px; background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #0b0f14; font-weight: 700; display: flex; align-items: center; justify-content: center; font-size: 18px; }
.brand-title { font-weight: 600; font-size: 15px; }
.brand-sub { font-size: 12px; color: var(--text-dim); }

.progress-summary { padding: 14px 20px 4px; font-size: 12px; color: var(--text-dim); }
.progress-bar { height: 6px; background: var(--bg-2); border-radius: 3px; overflow: hidden; margin-top: 6px; }
.progress-fill { height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-2)); transition: width .4s ease; }

#moduleNav { flex: 1; overflow-y: auto; padding: 8px 10px 12px; }
.nav-item { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: 8px; cursor: pointer; color: var(--text-dim); border: 1px solid transparent; margin-bottom: 2px; }
.nav-item:hover { background: var(--bg-2); color: var(--text); }
.nav-item.active { background: var(--surface); color: var(--text); border-color: var(--border); }
.nav-item .num { width: 22px; height: 22px; border-radius: 11px; background: var(--bg-2); font-size: 11px; display: flex; align-items: center; justify-content: center; color: var(--text-dim); }
.nav-item.complete .num { background: var(--green); color: #052e1e; }
.nav-item .nav-title { font-size: 13px; line-height: 1.25; }
.nav-item .nav-sub { font-size: 11px; color: var(--text-faint); }
.nav-group-header { font-size: 10px; letter-spacing: 1.6px; color: var(--text-faint); padding: 14px 14px 6px 14px; text-transform: uppercase; }


.sidebar-footer { padding: 12px 18px; border-top: 1px solid var(--border); display: flex; flex-direction: column; gap: 8px; }
.version { font-size: 11px; color: var(--text-faint); }

#main { display: flex; flex-direction: column; overflow: hidden; }
.topbar { display: flex; justify-content: space-between; align-items: center; padding: 12px 28px; border-bottom: 1px solid var(--border); background: var(--bg); }
.crumb { color: var(--text-dim); font-size: 13px; }
.topbar-actions { display: flex; gap: 8px; }

.content { flex: 1; overflow-y: auto; padding: 28px 40px 60px; }

/* Buttons */
.btn { padding: 8px 14px; border-radius: 8px; border: 1px solid var(--border); background: var(--surface); color: var(--text); transition: background .15s, border-color .15s; }
.btn:hover { background: var(--surface-2); border-color: var(--text-faint); }
.btn-primary { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #0b0f14; border: none; font-weight: 600; }
.btn-primary:hover { filter: brightness(1.08); }
.btn-ghost { background: transparent; color: var(--text-dim); }
.btn-ghost:hover { color: var(--text); background: var(--surface); }

/* Home */
.home { max-width: 1080px; margin: 0 auto; }
.home-hero { padding: 36px 0 30px; border-bottom: 1px solid var(--border); margin-bottom: 30px; }
.hero-eyebrow { color: var(--accent); font-size: 13px; letter-spacing: 1px; text-transform: uppercase; }
.hero-title { font-size: 44px; margin: 8px 0 4px; font-weight: 700; letter-spacing: -.5px; }
.hero-sub { color: var(--text-dim); font-size: 16px; max-width: 720px; }
.hero-meta { display: flex; gap: 22px; color: var(--text-faint); font-size: 13px; margin: 20px 0 22px; }
.hero-meta span strong { color: var(--text); font-size: 20px; display: block; }
.hero-cta { display: flex; gap: 10px; }

.home-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 16px; }
.module-card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 18px; cursor: pointer; transition: transform .15s, border-color .15s; }
.module-card:hover { transform: translateY(-2px); border-color: var(--accent); }
.module-card .mc-num { font-family: var(--mono); color: var(--accent); font-size: 12px; letter-spacing: 1px; }
.module-card .mc-title { font-size: 17px; font-weight: 600; margin: 4px 0 6px; }
.module-card .mc-sub { color: var(--text-dim); font-size: 13px; min-height: 36px; }
.module-card .mc-meta { display: flex; gap: 10px; margin-top: 14px; font-size: 12px; color: var(--text-faint); }
.module-card .mc-meta .chip { background: var(--bg-2); padding: 3px 8px; border-radius: 10px; }
.module-card.complete { border-color: var(--green); }
.module-card.complete .mc-num { color: var(--green); }

/* Module view */
.module-view { max-width: 1040px; margin: 0 auto; }
.module-head { display: flex; gap: 18px; align-items: flex-start; padding: 16px 0 20px; border-bottom: 1px solid var(--border); margin-bottom: 20px; }
.module-num { width: 56px; height: 56px; border-radius: 12px; background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #0b0f14; font-weight: 700; font-size: 22px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.module-title { font-size: 28px; margin: 0 0 4px; letter-spacing: -.3px; }
.module-sub { color: var(--text-dim); font-size: 15px; }
.module-meta { margin-top: 8px; font-size: 12px; color: var(--text-faint); }

.objective-block { background: var(--bg-1); border: 1px solid var(--border); border-radius: 10px; padding: 14px 18px; margin-bottom: 20px; }
.block-label { font-size: 11px; letter-spacing: 1.2px; text-transform: uppercase; color: var(--text-faint); margin-bottom: 6px; }
.objectives { margin: 0; padding-left: 18px; font-size: 14px; color: var(--text-dim); }
.objectives li { margin: 3px 0; }

.lesson-tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 24px; }
.tab { background: transparent; border: none; padding: 10px 16px; color: var(--text-dim); border-bottom: 2px solid transparent; font-size: 14px; }
.tab:hover { color: var(--text); }
.tab.active { color: var(--text); border-bottom-color: var(--accent); }

.tab-panels { min-height: 420px; }
.panel { display: none; }
.panel.active { display: block; }

/* Lesson content */
.lesson-body { font-size: 15.5px; color: var(--text); max-width: 780px; }
.lesson-body h2 { font-size: 22px; margin: 28px 0 10px; }
.lesson-body h3 { font-size: 17px; margin: 22px 0 6px; color: var(--accent); }
.lesson-body p { margin: 10px 0; color: #d8e0ec; }
.lesson-body ul { padding-left: 22px; }
.lesson-body li { margin: 4px 0; color: #d8e0ec; }
.lesson-body blockquote { border-left: 3px solid var(--accent); padding: 4px 14px; margin: 14px 0; color: var(--text-dim); background: var(--bg-1); border-radius: 0 6px 6px 0; }
.lesson-body code { font-family: var(--mono); background: var(--bg-2); padding: 1px 6px; border-radius: 4px; font-size: .9em; }
.lesson-body .callout { background: var(--bg-1); border: 1px solid var(--border); border-left: 3px solid var(--accent); padding: 12px 16px; margin: 16px 0; border-radius: 0 8px 8px 0; }
.lesson-body .callout .tag { color: var(--accent); font-weight: 600; font-size: 12px; letter-spacing: 1px; text-transform: uppercase; display: block; margin-bottom: 4px; }
.lesson-body table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 14px; }
.lesson-body th, .lesson-body td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; vertical-align: top; }
.lesson-body th { background: var(--bg-2); color: var(--text); font-weight: 600; font-size: 13px; }
.lesson-body .platform-lab { background: linear-gradient(135deg, rgba(94,234,212,.08), rgba(96,165,250,.08)); border: 1px solid rgba(94,234,212,.3); border-radius: 10px; padding: 14px 18px; margin: 22px 0; }
.lesson-body .platform-lab .lab-label { color: var(--accent); font-weight: 700; font-size: 12px; letter-spacing: 1.2px; text-transform: uppercase; }

/* Podcast */
.podcast-wrap { max-width: 780px; }
.podcast-hero { background: linear-gradient(135deg, #1a2332, #0f1520); border: 1px solid var(--border); border-radius: 12px; padding: 22px 24px; display: flex; gap: 18px; align-items: center; }
.podcast-art { width: 100px; height: 100px; border-radius: 10px; background: linear-gradient(135deg, var(--accent-2), #8b5cf6); display: flex; align-items: center; justify-content: center; font-size: 46px; flex-shrink: 0; }
.podcast-meta h3 { margin: 0 0 4px; font-size: 20px; }
.podcast-meta .pm-hosts { color: var(--text-dim); font-size: 13px; }
.podcast-meta .pm-duration { font-family: var(--mono); font-size: 12px; color: var(--text-faint); margin-top: 4px; }

.podcast-player { margin-top: 18px; background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 14px 18px; display: flex; align-items: center; gap: 14px; }
.pp-btn { width: 44px; height: 44px; border-radius: 22px; background: var(--accent); color: #0b0f14; border: none; font-size: 16px; display: flex; align-items: center; justify-content: center; }
.pp-btn:hover { filter: brightness(1.1); }
.pp-progress { flex: 1; display: flex; flex-direction: column; gap: 6px; }
.pp-time { display: flex; justify-content: space-between; font-family: var(--mono); font-size: 11px; color: var(--text-faint); }
.pp-bar { height: 4px; background: var(--bg-2); border-radius: 2px; overflow: hidden; }
.pp-fill { height: 100%; background: var(--accent); width: 0%; }
.pp-speed { background: var(--bg-2); padding: 4px 10px; border-radius: 12px; font-family: var(--mono); font-size: 12px; border: none; color: var(--text-dim); }

.podcast-transcript { margin-top: 22px; background: var(--bg-1); border: 1px solid var(--border); border-radius: 10px; padding: 18px 22px; }
.podcast-transcript h4 { margin: 0 0 12px; font-size: 13px; color: var(--text-dim); text-transform: uppercase; letter-spacing: 1px; }
.turn { margin: 10px 0; padding-left: 56px; position: relative; }
.turn.active { background: rgba(94,234,212,.08); border-radius: 6px; padding: 6px 8px 6px 56px; }
.turn .speaker { position: absolute; left: 0; top: 0; padding: 2px 8px; border-radius: 10px; font-size: 11px; font-weight: 600; letter-spacing: .5px; }
.turn.a .speaker { background: rgba(94,234,212,.2); color: var(--accent); }
.turn.b .speaker { background: rgba(96,165,250,.2); color: var(--accent-2); }
.turn .text { font-size: 14px; color: #d8e0ec; }

.audio-stub { background: var(--bg-1); border: 1px dashed var(--border); border-radius: 8px; padding: 12px 16px; color: var(--text-faint); font-size: 13px; margin-top: 16px; }
.audio-stub code { background: var(--bg-2); padding: 1px 6px; border-radius: 4px; font-family: var(--mono); font-size: 12px; }

/* Animation */
.animation-wrap { max-width: 960px; }
.anim-frame { background: var(--bg-1); border: 1px solid var(--border); border-radius: 12px; overflow: hidden; }
.anim-frame iframe { width: 100%; height: 600px; border: 0; background: var(--bg); display: block; }

/* Quiz */
.quiz-wrap { max-width: 820px; }
.quiz-item { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 18px 20px; margin-bottom: 14px; }
.quiz-item .q-num { color: var(--accent); font-family: var(--mono); font-size: 11px; letter-spacing: 1px; }
.quiz-item .q-stem { font-size: 15.5px; margin: 4px 0 12px; }
.quiz-options { display: flex; flex-direction: column; gap: 6px; }
.quiz-option { padding: 10px 14px; border-radius: 8px; border: 1px solid var(--border); background: var(--bg-2); cursor: pointer; font-size: 14px; display: flex; gap: 10px; align-items: flex-start; }
.quiz-option:hover { border-color: var(--text-faint); }
.quiz-option.chosen { border-color: var(--accent-2); background: rgba(96,165,250,.08); }
.quiz-option.correct { border-color: var(--green); background: rgba(52,211,153,.1); }
.quiz-option.wrong { border-color: var(--red); background: rgba(248,113,113,.08); }
.quiz-option .o-letter { font-family: var(--mono); color: var(--text-dim); font-size: 12px; }
.quiz-rationale { margin-top: 10px; font-size: 13px; color: var(--text-dim); border-left: 2px solid var(--accent); padding-left: 10px; display: none; }
.quiz-item.answered .quiz-rationale { display: block; }
.quiz-summary { margin-top: 16px; padding: 16px 20px; border-radius: 10px; background: var(--bg-1); border: 1px solid var(--border); }
.quiz-summary .big { font-size: 28px; font-weight: 700; }
.quiz-summary.pass { border-left: 4px solid var(--green); }
.quiz-summary.fail { border-left: 4px solid var(--red); }

/* Module footer nav */
.module-foot { display: flex; justify-content: space-between; align-items: center; margin-top: 30px; padding-top: 20px; border-top: 1px solid var(--border); }

/* Mystery case cards */
.cases-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 14px; margin: 18px 0; }
.case-card { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 16px; }
.case-card .tier { font-size: 11px; letter-spacing: 1px; color: var(--accent-warm); font-weight: 600; text-transform: uppercase; }
.case-card .case-title { font-size: 16px; font-weight: 600; margin: 4px 0 2px; }
.case-card .case-patient { color: var(--text-dim); font-size: 13px; }
.case-card .case-complaint { color: var(--text-faint); font-size: 13px; font-style: italic; margin: 8px 0 12px; }
.case-card button { width: 100%; }
.case-card.tier-3 { border-left: 3px solid var(--accent-warm); }

/* Utility */
.muted { color: var(--text-dim); }
.tight { margin: 4px 0; }

@media (max-width: 900px) {
  #app { grid-template-columns: 1fr; }
  #sidebar { display: none; }
  .content { padding: 20px; }
  .hero-title { font-size: 32px; }
}