/* CPR Reference — Aidalee
 * Mobile-first, print-friendly, no JS framework.
 * Color palette: red accent (matches first-aid cross), calm grays.
 */

:root {
  --red: #b91c1c;
  --red-dark: #7f1d1d;
  --red-soft: #fee2e2;
  --amber: #b45309;
  --amber-soft: #fef3c7;
  --green: #047857;
  --green-soft: #d1fae5;
  --slate: #1f2937;
  --slate-mid: #475569;
  --slate-soft: #64748b;
  --line: #e2e8f0;
  --line-strong: #cbd5e1;
  --bg: #fafafa;
  --card-bg: #ffffff;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 4px 12px rgba(15, 23, 42, 0.06);
  --radius: 12px;
  --radius-sm: 8px;
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI",
    Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --red: #ef4444;
    --red-dark: #b91c1c;
    --red-soft: #3f1212;
    --amber: #f59e0b;
    --amber-soft: #3b2706;
    --green: #10b981;
    --green-soft: #052e22;
    --slate: #f1f5f9;
    --slate-mid: #cbd5e1;
    --slate-soft: #94a3b8;
    --line: #1e293b;
    --line-strong: #334155;
    --bg: #0f172a;
    --card-bg: #1e293b;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 4px 12px rgba(0, 0, 0, 0.4);
  }
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--slate);
  background: var(--bg);
  line-height: 1.55;
  font-size: 16px;
}

a { color: var(--red); text-decoration: none; }
a:hover, a:focus { text-decoration: underline; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--red);
  color: #fff;
  padding: 8px 16px;
  border-radius: 0 0 var(--radius-sm) 0;
  z-index: 100;
}
.skip-link:focus { left: 0; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, var(--red-dark) 0%, var(--red) 100%);
  color: #fff;
  padding: 36px 0 28px;
  border-bottom: 4px solid var(--red-dark);
}
.hero .kicker {
  margin: 0 0 6px;
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.85;
}
.hero h1 {
  margin: 0 0 12px;
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.hero .lede {
  margin: 0 0 18px;
  max-width: 760px;
  font-size: 16px;
  opacity: 0.95;
}
.call911 {
  background: rgba(255, 255, 255, 0.13);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius);
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 15px;
  max-width: 820px;
}
.call911-label {
  font-size: 13px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  opacity: 0.85;
}

/* ===== Stage tabs ===== */
.stage-tabs {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--card-bg);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.04);
}
.stage-tabs .container {
  display: flex;
  gap: 6px;
  padding: 8px 12px;
  overflow-x: auto;
  scrollbar-width: none;
}
.stage-tabs .container::-webkit-scrollbar { display: none; }
.stage-tab {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  color: var(--slate-mid);
  text-decoration: none;
  border: 1px solid transparent;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  min-width: 78px;
}
.stage-tab:hover {
  background: var(--red-soft);
  color: var(--red-dark);
  text-decoration: none;
}
.stage-tab.active {
  background: var(--red);
  color: #fff;
  border-color: var(--red-dark);
}
.stage-num {
  font-size: 12px;
  font-weight: 700;
  opacity: 0.8;
}
.stage-label {
  font-size: 15px;
  font-weight: 600;
}
.stage-range {
  font-size: 11px;
  opacity: 0.85;
}

/* ===== Main ===== */
main { padding: 28px 0 60px; }
.age-help {
  margin: 0 0 24px;
  color: var(--slate-mid);
  font-size: 15px;
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-left: 4px solid var(--red);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
}

/* ===== Stage sections ===== */
.stage-section {
  margin: 36px 0;
  scroll-margin-top: 84px;
}
.stage-header {
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--line);
}
.stage-header h2 {
  margin: 0 0 4px;
  font-size: clamp(22px, 4vw, 28px);
  letter-spacing: -0.01em;
  color: var(--slate);
}
.stage-tagline {
  margin: 0;
  color: var(--slate-mid);
  font-size: 15px;
  font-style: italic;
}

/* ===== Grid + cards ===== */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 14px;
}
.card {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow);
}
.card h3 {
  margin: 0 0 10px;
  font-size: 17px;
  color: var(--red-dark);
  letter-spacing: -0.005em;
}
.card h4 {
  margin: 14px 0 6px;
  font-size: 14px;
  color: var(--slate-mid);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.card p { margin: 0 0 8px; }
.card p:last-child { margin-bottom: 0; }
.card ul {
  margin: 0;
  padding-left: 1.2em;
}
.card ul ul { margin: 4px 0; }
.card li { margin: 4px 0; }
.card-warning {
  background: var(--amber-soft);
  border-color: #fcd34d;
}
.card-warning h3 { color: var(--amber); }
.card-stop {
  background: var(--green-soft);
  border-color: #6ee7b7;
}
.card-stop h3 { color: var(--green); }
.card-highlight {
  background: var(--red-soft);
  border-color: var(--red);
  border-width: 2px;
}
.card-highlight h3 { color: var(--red-dark); }

/* ===== Comparison table ===== */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--card-bg);
  box-shadow: var(--shadow);
}
.compare {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 720px;
}
.compare th, .compare td {
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}
.compare thead th {
  background: var(--red-soft);
  color: var(--red-dark);
  font-weight: 700;
  position: sticky;
  top: 0;
  text-align: center;
}
.compare thead th:first-child {
  background: var(--card-bg);
}
.compare tbody th {
  font-weight: 600;
  width: 180px;
  color: var(--slate);
  background: rgba(0, 0, 0, 0.02);
}
.compare tbody td {
  text-align: center;
}
.compare tbody td:first-child {
  text-align: left;
  background: rgba(0, 0, 0, 0.02);
}
.compare tbody tr:last-child th,
.compare tbody tr:last-child td {
  border-bottom: none;
}
.th-sub {
  display: block;
  font-weight: 400;
  font-size: 11px;
  opacity: 0.8;
  text-transform: none;
  letter-spacing: 0;
  margin-top: 2px;
}

/* ===== Resources ===== */
.resource-group {
  margin: 28px 0 10px;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--slate-soft);
}
.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 10px;
}
.resource {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--slate);
  text-decoration: none;
  transition: border-color 0.15s, transform 0.15s;
}
.resource:hover {
  border-color: var(--red);
  text-decoration: none;
  transform: translateY(-1px);
}
.resource strong { color: var(--red-dark); }
.resource-meta {
  font-size: 13px;
  color: var(--slate-soft);
}

/* ===== Disclaimer ===== */
.disclaimer {
  margin-top: 40px;
  padding: 20px 24px;
  background: var(--amber-soft);
  border: 1px solid #fcd34d;
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--slate);
}
.disclaimer p { margin: 0 0 8px; }
.disclaimer p:last-child { margin-bottom: 0; font-size: 13px; color: var(--slate-mid); }

/* ===== Print button ===== */
.print-btn {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--red);
  color: #fff;
  border: none;
  border-radius: 999px;
  padding: 12px 20px;
  font-size: 15px;
  font-weight: 600;
  box-shadow: 0 4px 16px rgba(185, 28, 28, 0.4);
  cursor: pointer;
  z-index: 30;
}
.print-btn:hover { background: var(--red-dark); }

/* ===== Mobile tweaks ===== */
@media (max-width: 640px) {
  .hero { padding: 24px 0 18px; }
  .hero h1 { font-size: 26px; }
  .grid { grid-template-columns: 1fr; }
  .stage-tab { padding: 6px 10px; min-width: 64px; }
  .stage-label { font-size: 13px; }
  .stage-range { font-size: 10px; }
  main { padding: 18px 0 80px; }
  .stage-section { margin: 24px 0; }
  .print-btn { bottom: 16px; right: 16px; padding: 10px 16px; }
}

/* ===== Print ===== */
@media print {
  body { background: #fff; color: #000; font-size: 12pt; }
  .stage-tabs, .print-btn, .skip-link, .call911, .age-help { display: none; }
  .hero {
    background: #fff !important;
    color: #000;
    border-bottom: 2px solid #000;
    padding: 12pt 0 8pt;
  }
  .hero h1 { color: #000; font-size: 18pt; }
  .hero .lede { color: #333; font-size: 10pt; }
  .hero .kicker { color: #555; }
  main { padding: 0; }
  .stage-section { margin: 12pt 0; page-break-inside: avoid; }
  .stage-header h2 { font-size: 14pt; }
  .grid { display: block; }
  .card {
    box-shadow: none;
    border: 1px solid #ccc;
    margin-bottom: 8pt;
    padding: 8pt 10pt;
    page-break-inside: avoid;
  }
  .card h3 { font-size: 11pt; color: #000; }
  .card-warning, .card-stop, .card-highlight { background: #fff !important; }
  .card-warning h3, .card-stop h3, .card-highlight h3 { color: #000; }
  .table-wrap { box-shadow: none; border: 1px solid #ccc; }
  .compare thead th { background: #eee !important; color: #000; }
  .compare th, .compare td { padding: 4pt 6pt; font-size: 9pt; }
  .compare tbody th, .compare tbody td:first-child { background: #f5f5f5 !important; }
  .resource { box-shadow: none; border: 1px solid #ccc; }
  a { color: #000; text-decoration: underline; }
  .disclaimer { background: #fff !important; border: 1px solid #999; }
  /* Force each age stage onto its own page when printing */
  #comparison, #resources, #emergency { page-break-before: always; }
}