:root {
  --ink: #eef7f8;
  --muted: #b7cbd0;
  --bg: #071a21;
  --panel: #0d2932;
  --panel-2: #113640;
  --line: #2b5660;
  --teal: #39d5c5;
  --cyan: #71d8ff;
  --gold: #ffd166;
  --coral: #ff7b72;
  --green: #6ee7a8;
  --purple: #d2b4ff;
  --max: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: radial-gradient(circle at 15% 0%, #124452 0, var(--bg) 34rem);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.55;
}
a { color: var(--cyan); }
a:hover { color: #b5ecff; }
button, input { font: inherit; }
a:focus-visible, button:focus-visible, input:focus-visible, [tabindex]:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 3px;
}

.skip-link { position: absolute; left: -9999px; top: 8px; z-index: 999; padding: .7rem 1rem; background: white; color: #071a21; }
.skip-link:focus { left: 8px; }
.shell { width: min(var(--max), calc(100% - 2rem)); margin: 0 auto; }

.hero { padding: 3.2rem 0 2.3rem; border-bottom: 1px solid var(--line); }
.eyebrow { margin: 0 0 .55rem; color: var(--teal); font-size: .78rem; font-weight: 800; letter-spacing: .11em; text-transform: uppercase; }
h1 { margin: 0; max-width: 900px; font-size: clamp(2rem, 6vw, 4rem); line-height: 1.05; }
.lede { max-width: 800px; margin: 1rem 0 0; color: var(--muted); font-size: 1.08rem; }
.hero-actions, .meta-row, .button-row { display: flex; flex-wrap: wrap; gap: .75rem; align-items: center; }
.hero-actions { margin-top: 1.35rem; }
.meta-row { margin-top: 1.25rem; color: var(--muted); font-size: .86rem; }
.pill { display: inline-flex; align-items: center; gap: .35rem; padding: .3rem .65rem; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,.035); }

.btn, .tab, .answer, .case-answer {
  border: 1px solid var(--line);
  border-radius: .7rem;
  cursor: pointer;
  color: var(--ink);
  background: var(--panel-2);
}
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: .65rem 1rem; font-weight: 750; text-decoration: none; }
.btn.primary { border-color: var(--teal); color: #041416; background: var(--teal); }
.btn.secondary { background: transparent; }
.btn:hover, .tab:hover, .answer:hover:not(:disabled), .case-answer:hover:not(:disabled) { border-color: var(--teal); filter: brightness(1.08); }

.tabs-wrap { position: sticky; top: 0; z-index: 40; background: rgba(7,26,33,.96); border-bottom: 1px solid var(--line); backdrop-filter: blur(10px); }
.tabs { display: flex; gap: .45rem; overflow-x: auto; padding: .65rem 0; scrollbar-width: thin; }
.tab { flex: 0 0 auto; min-height: 42px; padding: .55rem .8rem; white-space: nowrap; }
.tab[aria-selected="true"] { color: #041416; border-color: var(--teal); background: var(--teal); font-weight: 800; }

main { padding: 1.4rem 0 4rem; }
.panel[hidden] { display: none; }
.section-head { margin: .5rem 0 1.2rem; }
.section-head h2 { margin: 0 0 .35rem; font-size: clamp(1.6rem, 4vw, 2.25rem); }
.section-head p { margin: 0; max-width: 800px; color: var(--muted); }
h3 { margin: 0 0 .5rem; font-size: 1.15rem; }
h4 { margin: 0 0 .35rem; }
p { margin-top: .4rem; }

.grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 1rem; }
.card { grid-column: span 6; padding: 1.15rem; border: 1px solid var(--line); border-radius: 1rem; background: linear-gradient(145deg, var(--panel), #0a232b); }
.card.full { grid-column: 1 / -1; }
.card.third { grid-column: span 4; }
.card p:last-child, .card ul:last-child { margin-bottom: 0; }
.card ul, .card ol { padding-left: 1.25rem; }
.card li + li { margin-top: .35rem; }
.kicker { color: var(--teal); font-size: .76rem; font-weight: 850; letter-spacing: .08em; text-transform: uppercase; }
.callout { margin: 1rem 0; padding: .9rem 1rem; border-left: 4px solid var(--teal); border-radius: .5rem; background: #10323a; }
.callout.warning { border-color: var(--gold); }
.callout.danger { border-color: var(--coral); }
.callout strong { color: white; }
.evidence { display: inline-block; margin-left: .3rem; padding: .12rem .42rem; border-radius: .4rem; font-size: .7rem; font-weight: 800; vertical-align: .1rem; }
.evidence.guideline { color: #051417; background: var(--green); }
.evidence.consensus { color: #07131c; background: var(--cyan); }
.evidence.evolving { color: #261d00; background: var(--gold); }

.objective-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: .7rem; padding: 0; list-style: none; counter-reset: objective; }
.objective-list li { position: relative; min-height: 68px; padding: .85rem .85rem .85rem 3.2rem; border: 1px solid var(--line); border-radius: .8rem; background: var(--panel); }
.objective-list li::before { counter-increment: objective; content: counter(objective); position: absolute; left: .85rem; top: .85rem; width: 1.65rem; height: 1.65rem; border-radius: 50%; display: grid; place-items: center; color: #041416; background: var(--teal); font-weight: 900; }
.workbench-list { grid-template-columns: repeat(3, 1fr); }
.resource-refs { columns: 1; }

.decision { display: grid; gap: .7rem; }
.decision-step { display: grid; grid-template-columns: 2.1rem 1fr; gap: .75rem; padding: .9rem; border: 1px solid var(--line); border-radius: .85rem; background: var(--panel); }
.decision-num { width: 2.1rem; height: 2.1rem; display: grid; place-items: center; border-radius: 50%; color: #041416; background: var(--teal); font-weight: 900; }
.decision-step p, .decision-step ul { margin: .25rem 0 0; }

.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: .85rem; }
table { width: 100%; min-width: 720px; border-collapse: collapse; background: var(--panel); }
th, td { padding: .75rem; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { color: var(--teal); background: #10313a; font-size: .8rem; letter-spacing: .04em; text-transform: uppercase; }
tr:last-child td { border-bottom: 0; }

details { border: 1px solid var(--line); border-radius: .85rem; background: var(--panel); }
details + details { margin-top: .7rem; }
summary { min-height: 48px; padding: .8rem 1rem; cursor: pointer; color: var(--ink); font-weight: 800; }
.details-body { padding: 0 1rem 1rem; color: var(--muted); }
.details-body strong { color: var(--ink); }

.quiz-intro { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .8rem; align-items: center; margin-bottom: 1rem; }
.score-chip { padding: .45rem .75rem; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); background: var(--panel); }
.question { margin-bottom: 1rem; padding: 1rem; border: 1px solid var(--line); border-radius: .9rem; background: var(--panel); }
.question legend { padding: 0 .25rem; font-weight: 800; }
.answers { display: grid; gap: .55rem; margin-top: .75rem; }
.answer, .case-answer { width: 100%; padding: .72rem .8rem; text-align: left; }
.answer:disabled, .case-answer:disabled { cursor: default; opacity: 1; }
.answer.selected { border-color: var(--gold); background: #443b18; box-shadow: inset 0 0 0 1px var(--gold); }
.answer.correct, .case-answer.correct { border-color: var(--green); background: #123e31; }
.answer.wrong, .case-answer.wrong { border-color: var(--coral); background: #47242a; }
.feedback { margin: .7rem 0 0; padding: .7rem .8rem; border-radius: .65rem; background: #0b2026; color: var(--muted); }
.feedback strong { color: var(--ink); }
.results { margin: 1rem 0; padding: 1.1rem; border: 2px solid var(--teal); border-radius: 1rem; background: var(--panel); }
.results.pass { border-color: var(--green); }
.results.retry { border-color: var(--gold); }
.domain-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: .55rem; margin-top: .75rem; }
.domain { padding: .65rem; border: 1px solid var(--line); border-radius: .65rem; background: #0a2027; }
.domain span { display: block; color: var(--muted); font-size: .78rem; }

.case { margin-bottom: 1rem; padding: 1rem; border: 1px solid var(--line); border-radius: 1rem; background: var(--panel); }
.case-header { display: flex; gap: .75rem; align-items: flex-start; }
.case-number { flex: 0 0 auto; width: 2rem; height: 2rem; display: grid; place-items: center; border-radius: 50%; color: #041416; background: var(--purple); font-weight: 900; }
.case-stage { margin-top: .8rem; padding-top: .8rem; border-top: 1px solid var(--line); }

.quick-ref { border: 2px solid var(--teal); }
.refs { padding-left: 1.3rem; }
.refs li + li { margin-top: .7rem; }
.small { color: var(--muted); font-size: .86rem; }
.footer-note { margin-top: 2rem; padding-top: 1rem; border-top: 1px solid var(--line); color: var(--muted); font-size: .82rem; }

@media (max-width: 780px) {
  .card, .card.third { grid-column: 1 / -1; }
  .objective-list { grid-template-columns: 1fr; }
  .workbench-list { grid-template-columns: 1fr; }
  .domain-grid { grid-template-columns: 1fr; }
  .hero { padding-top: 2.2rem; }
}

@media print {
  body { color: #111; background: #fff; }
  .hero, .tabs-wrap, .hero-actions, .button-row, .no-print, footer { display: none !important; }
  .shell { width: 100%; }
  main { padding: 0; }
  .panel { display: none !important; }
  #panel-quick { display: block !important; }
  .card, table, .table-wrap { color: #111; border-color: #777; background: #fff; box-shadow: none; }
  th { color: #111; background: #eee; }
  a { color: #111; text-decoration: none; }
}