:root {
  --bg: #0f172a;
  --panel: #111827;
  --panel-2: #162033;
  --card: #ffffff;
  --ink: #111827;
  --muted: #64748b;
  --line: #dbe3ef;
  --accent: #2563eb;
  --accent-2: #0ea5e9;
  --ok: #059669;
  --warn: #d97706;
  --danger: #dc2626;
  --radius: 18px;
  --shadow: 0 18px 50px rgba(15, 23, 42, 0.18);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #eef4fb;
  color: var(--ink);
}
button, input, select, textarea { font: inherit; }
a { color: var(--accent); }
.skip-link { position: absolute; left: -999px; top: 8px; background: white; padding: 8px 12px; z-index: 10; }
.skip-link:focus { left: 8px; }
.topbar {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 14px 22px;
  background: linear-gradient(135deg, #08111f, #0f2a55);
  color: white;
  box-shadow: 0 8px 30px rgba(15, 23, 42, 0.25);
}
.brand { display: flex; align-items: center; gap: 12px; min-width: 280px; }
.brand strong { display:block; line-height: 1.1; font-size: 1.05rem; }
.brand small { display:block; opacity: .78; margin-top: 2px; }
.brand-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 42px; height: 42px; border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  font-weight: 800; letter-spacing: .02em;
}
.topnav { display: flex; flex-wrap: wrap; gap: 8px; justify-content: flex-end; }
.nav-btn, .ghost, .primary, .small-btn {
  border: 0; cursor: pointer; border-radius: 999px; transition: .18s ease;
}
.nav-btn { padding: 8px 12px; background: rgba(255,255,255,.1); color: #e5eefc; }
.nav-btn:hover, .nav-btn.active { background: white; color: #0f172a; }
.layout { display: grid; grid-template-columns: 320px 1fr; gap: 22px; padding: 22px; max-width: 1440px; margin: 0 auto; }
.sidebar { display: flex; flex-direction: column; gap: 16px; }
.panel, .card, .hero, .module-detail, .quiz-card, .flashcard, .scenario-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow);
}
.panel { padding: 18px; }
.panel.compact h2 { margin: 0 0 10px; font-size: 1rem; }
.panel label { display: block; font-weight: 700; margin-bottom: 8px; }
select, input, textarea {
  width: 100%; border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; background: #fff; color: var(--ink);
}
textarea { min-height: 140px; resize: vertical; }
.search-results { margin-top: 10px; display: flex; flex-direction: column; gap: 8px; }
.search-hit { text-align: left; width: 100%; background: #f8fafc; border: 1px solid var(--line); padding: 10px; border-radius: 12px; cursor: pointer; }
.search-hit:hover { border-color: var(--accent); }
.progress-ring {
  width: 120px; height: 120px; margin: 8px auto 14px; border-radius: 50%;
  background: conic-gradient(var(--ok) 0deg, #e2e8f0 0deg);
  display:flex; align-items:center; justify-content:center; position:relative;
}
.progress-ring::before { content:""; position:absolute; inset: 10px; background:white; border-radius:50%; }
.progress-ring span { position:relative; font-weight:800; font-size:1.3rem; }
.ghost { width: 100%; padding: 10px 12px; background: #f1f5f9; color: #0f172a; }
.ghost:hover { background: #e2e8f0; }
.primary { padding: 10px 16px; color: white; background: var(--accent); font-weight: 700; }
.primary:hover { filter: brightness(.96); transform: translateY(-1px); }
.small-btn { padding: 7px 10px; background: #eef2ff; color: #1e40af; }
.content { min-width: 0; }
.hero { padding: 28px; background: linear-gradient(135deg, #fff, #eaf4ff); }
.hero h1 { margin: 0; font-size: clamp(2rem, 4vw, 3.3rem); letter-spacing: -.03em; }
.hero p { color: #334155; max-width: 920px; font-size: 1.05rem; }
.hero-actions { display:flex; flex-wrap:wrap; gap: 10px; margin-top: 18px; }
.metrics { display:grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 14px; margin-top: 20px; }
.metric { background: white; padding: 16px; border-radius: 14px; border: 1px solid var(--line); }
.metric strong { display:block; font-size: 1.8rem; }
.metric span { color: var(--muted); font-size:.95rem; }
.grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 16px; margin-top: 18px; }
.card { padding: 18px; }
.card h3 { margin: 10px 0 8px; }
.card p { color: var(--muted); }
.card-header { display:flex; justify-content: space-between; gap: 8px; align-items:center; }
.badge { display:inline-flex; align-items:center; padding: 5px 9px; border-radius: 999px; background:#e0f2fe; color:#075985; font-size:.78rem; font-weight:700; }
.duration { color: var(--muted); font-size:.85rem; }
.card-actions { display:flex; gap:8px; flex-wrap:wrap; margin-top: 14px; }
.module-detail { padding: 26px; }
.module-detail h1 { margin: 0 0 8px; }
.kicker { color: var(--muted); font-weight: 700; text-transform: uppercase; letter-spacing:.08em; font-size:.78rem; }
.two-col { display:grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.section-box { border:1px solid var(--line); border-radius: 14px; padding:16px; background:#fbfdff; margin: 14px 0; }
.section-box h3 { margin:0 0 8px; }
ol, ul { padding-left: 1.2rem; }
li { margin: .4rem 0; }
.procedure { margin: 12px 0; border-left: 4px solid var(--accent); padding-left: 14px; }
.source-list li { color: #334155; font-size: .95rem; }
.check-grid { display:grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 8px; }
.check-item { display:flex; gap:8px; align-items:flex-start; background:#f8fafc; border:1px solid var(--line); border-radius: 12px; padding:10px; }
.check-item input { width:auto; margin-top:4px; }
.quiz-card { padding: 24px; }
.quiz-options { display:grid; gap: 10px; margin: 16px 0; }
.option { border:1px solid var(--line); border-radius: 14px; padding: 12px; background:#fff; cursor:pointer; text-align:left; }
.option:hover { border-color: var(--accent); }
.option.correct { border-color: var(--ok); background:#ecfdf5; }
.option.wrong { border-color: var(--danger); background:#fef2f2; }
.quiz-status { color: var(--muted); }
.flashcard { padding: 36px; min-height: 260px; display:flex; flex-direction:column; justify-content:center; text-align:center; cursor:pointer; user-select:none; }
.flashcard h2 { font-size: clamp(2rem, 4vw, 3rem); }
.flashcard p { color: var(--muted); font-size:1.1rem; }
.scenario-card { padding: 22px; margin-bottom: 16px; }
.rubric { display:grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 8px; margin-top: 12px; }
.rubric span { background:#f8fafc; border:1px solid var(--line); border-radius: 12px; padding:10px; }
.source-card code { font-size: .8rem; white-space: normal; }
.note { background:#fffbeb; border:1px solid #fde68a; border-radius:14px; padding: 14px; color:#7c2d12; }
.toolbar { display:flex; flex-wrap:wrap; gap: 10px; margin: 14px 0; }
.footer { padding: 16px 22px; color:#64748b; text-align:center; }
@media (max-width: 980px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { order: 2; }
  .topbar { align-items:flex-start; flex-direction: column; }
  .grid { grid-template-columns: 1fr 1fr; }
  .metrics { grid-template-columns: 1fr 1fr; }
  .two-col { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  .layout { padding: 12px; }
  .grid, .metrics, .check-grid, .rubric { grid-template-columns: 1fr; }
  .topnav { justify-content:flex-start; }
}
@media print {
  .topbar, .sidebar, .footer, .hero-actions, .card-actions, .toolbar { display:none !important; }
  .layout { display:block; padding:0; }
  .module-detail, .card, .panel { box-shadow:none; border:1px solid #ddd; }
}