/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --c-bg: #faf9f7;
  --c-surface: #ffffff;
  --c-surface-alt: #f5f3ef;
  --c-border: #e2ddd6;
  --c-text: #2d2a26;
  --c-text-light: #6b6560;
  --c-text-muted: #9a948e;
  --c-primary: #b91c1c;
  --c-primary-dark: #991b1b;
  --c-primary-light: #fef2f2;
  --c-amber: #d97706;
  --c-amber-light: #fffbeb;
  --c-warn: #b45309;
  --c-warn-light: #fff7ed;
  --c-alert: #dc2626;
  --c-alert-light: #fef2f2;
  --c-danger: #7f1d1d;
  --c-danger-light: #fef2f2;
  --c-critical: #450a0a;
  --c-critical-light: #fef2f2;
  --c-info: #1d4ed8;
  --c-info-light: #eff6ff;
  --c-success: #15803d;
  --c-success-light: #f0fdf4;
  --c-radius: 12px;
  --c-radius-sm: 8px;
  --c-shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --c-shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.04);
  --c-font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --c-max-width: 1120px;
  --c-header-height: 64px;
}

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--c-header-height) + 16px); }
body { font-family: var(--c-font); color: var(--c-text); background: var(--c-bg); line-height: 1.6; -webkit-font-smoothing: antialiased; }

a { color: var(--c-primary); text-decoration: underline; text-underline-offset: 2px; }
a:hover { color: var(--c-primary-dark); }

img { max-width: 100%; height: auto; }

.container { max-width: var(--c-max-width); margin: 0 auto; padding: 0 20px; }

.skip-link { position: absolute; top: -100%; left: 16px; background: var(--c-primary); color: #fff; padding: 8px 16px; border-radius: var(--c-radius-sm); z-index: 9999; text-decoration: none; font-weight: 600; }
.skip-link:focus { top: 8px; }

.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

/* ===== HEADER ===== */
.site-header { position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,0.92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--c-border); height: var(--c-header-height); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 100%; }

.logo { display: flex; align-items: center; gap: 8px; text-decoration: none; color: var(--c-text); font-weight: 700; font-size: 1.1rem; }
.logo:hover { color: var(--c-text); }
.logo-icon { width: 28px; height: 28px; flex-shrink: 0; }

.main-nav ul { display: flex; list-style: none; gap: 4px; }
.main-nav a { display: block; padding: 6px 12px; text-decoration: none; color: var(--c-text-light); font-size: 0.875rem; font-weight: 500; border-radius: var(--c-radius-sm); transition: background 0.15s, color 0.15s; }
.main-nav a:hover { background: var(--c-surface-alt); color: var(--c-text); }

.nav-toggle { display: none; flex-direction: column; gap: 4px; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle-bar { display: block; width: 22px; height: 2px; background: var(--c-text); border-radius: 1px; }

.mobile-nav { display: none; padding: 12px 0; border-top: 1px solid var(--c-border); }
.mobile-nav[hidden] { display: none; }
.mobile-nav:not([hidden]) { display: block; }
.mobile-nav ul { list-style: none; }
.mobile-nav a { display: block; padding: 10px 0; text-decoration: none; color: var(--c-text); font-weight: 500; border-bottom: 1px solid var(--c-border); }

/* ===== BUTTONS ===== */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 20px; border-radius: var(--c-radius-sm); font-size: 0.9375rem; font-weight: 600; text-decoration: none; cursor: pointer; border: 2px solid transparent; transition: background 0.15s, border-color 0.15s, color 0.15s, box-shadow 0.15s; }
.btn-primary { background: var(--c-primary); color: #fff; border-color: var(--c-primary); }
.btn-primary:hover { background: var(--c-primary-dark); border-color: var(--c-primary-dark); color: #fff; }
.btn-secondary { background: var(--c-surface); color: var(--c-text); border-color: var(--c-border); }
.btn-secondary:hover { background: var(--c-surface-alt); }

/* ===== HERO ===== */
.hero { padding: 60px 0 48px; background: linear-gradient(180deg, var(--c-primary-light) 0%, var(--c-bg) 100%); }
.hero .container { display: grid; grid-template-columns: 1fr 320px; gap: 48px; align-items: start; }
.hero-tag { display: inline-block; background: var(--c-amber-light); color: var(--c-warn); font-size: 0.8125rem; font-weight: 600; padding: 4px 12px; border-radius: 999px; margin-bottom: 16px; }
.hero h1 { font-size: clamp(2rem, 4vw, 2.75rem); line-height: 1.15; font-weight: 800; margin-bottom: 16px; }
.hero-sub { font-size: 1.125rem; color: var(--c-text-light); max-width: 540px; margin-bottom: 24px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 20px; }
.hero-note { display: flex; align-items: flex-start; gap: 8px; font-size: 0.8125rem; color: var(--c-text-muted); max-width: 480px; }
.hero-note svg { flex-shrink: 0; margin-top: 2px; color: var(--c-amber); }

.hero-stat { display: flex; flex-direction: column; gap: 12px; }
.stat-card { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--c-radius); padding: 20px; text-align: center; box-shadow: var(--c-shadow); }
.stat-card.accent { background: var(--c-primary-light); border-color: #fecaca; }
.stat-number { display: block; font-size: 1.75rem; font-weight: 800; color: var(--c-primary); line-height: 1.2; }
.stat-label { display: block; font-size: 0.8125rem; color: var(--c-text-light); margin-top: 4px; }

/* ===== SECTIONS ===== */
section { padding: 56px 0; }
.section-header { margin-bottom: 32px; }
.section-header h2 { font-size: 1.625rem; font-weight: 700; margin-bottom: 8px; }
.section-header p { color: var(--c-text-light); max-width: 640px; }

/* ===== TIMELINE ===== */
.timeline-section { background: var(--c-surface); }

.timeline-nav { display: flex; gap: 4px; margin-bottom: 24px; overflow-x: auto; padding-bottom: 4px; }
.tl-nav-btn { display: flex; flex-direction: column; align-items: center; gap: 4px; padding: 12px 16px; border: 2px solid var(--c-border); border-radius: var(--c-radius-sm); background: var(--c-bg); cursor: pointer; font-family: inherit; font-size: 0.8125rem; font-weight: 600; color: var(--c-text-light); transition: all 0.15s; white-space: nowrap; min-width: 100px; flex: 1; }
.tl-nav-btn:hover { border-color: var(--c-text-muted); }
.tl-nav-btn.active { border-color: var(--c-primary); background: var(--c-primary-light); color: var(--c-primary); }
.tl-nav-btn.emergency.active { border-color: var(--c-danger); background: var(--c-danger-light); color: var(--c-danger); }
.tl-num { font-size: 1.125rem; font-weight: 800; }
.tl-label { font-size: 0.75rem; }

.tl-stage { display: none; }
.tl-stage.active { display: block; }

.tl-stage-header { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.tl-stage-info { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.tl-badge { display: inline-block; padding: 4px 12px; border-radius: 999px; font-size: 0.8125rem; font-weight: 700; }
.tl-badge.info { background: var(--c-info-light); color: var(--c-info); }
.tl-badge.warn { background: var(--c-warn-light); color: var(--c-warn); }
.tl-badge.alert { background: var(--c-alert-light); color: var(--c-alert); }
.tl-badge.danger { background: var(--c-danger-light); color: var(--c-danger); }
.tl-badge.critical { background: var(--c-critical-light); color: var(--c-critical); }
.tl-time { font-size: 0.8125rem; color: var(--c-text-muted); font-weight: 500; }

.tl-action-tag { display: inline-block; padding: 4px 14px; border-radius: 999px; font-size: 0.8125rem; font-weight: 700; }
.tl-action-tag.watch { background: var(--c-info-light); color: var(--c-info); }
.tl-action-tag.call { background: var(--c-warn-light); color: var(--c-warn); }
.tl-action-tag.er { background: var(--c-alert-light); color: var(--c-alert); }
.tl-action-tag.emergency-act { background: var(--c-danger-light); color: var(--c-danger); }

.tl-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.tl-card { background: var(--c-bg); border: 1px solid var(--c-border); border-radius: var(--c-radius); padding: 20px; }
.tl-card h3 { font-size: 0.9375rem; font-weight: 700; margin-bottom: 12px; }
.tl-card ul { list-style: none; }
.tl-card li { padding: 6px 0; font-size: 0.875rem; color: var(--c-text-light); border-bottom: 1px solid var(--c-border); padding-left: 20px; position: relative; }
.tl-card li:last-child { border-bottom: none; }
.tl-card li::before { content: ''; position: absolute; left: 0; top: 14px; width: 6px; height: 6px; border-radius: 50%; background: var(--c-primary); }

/* ===== AGE GROUPS ===== */
.age-section { background: var(--c-bg); }

.age-tabs { display: flex; gap: 4px; margin-bottom: 24px; overflow-x: auto; padding-bottom: 4px; }
.age-tab { padding: 10px 20px; border: 2px solid var(--c-border); border-radius: var(--c-radius-sm); background: var(--c-surface); cursor: pointer; font-family: inherit; font-size: 0.875rem; font-weight: 600; color: var(--c-text-light); transition: all 0.15s; white-space: nowrap; }
.age-tab:hover { border-color: var(--c-text-muted); }
.age-tab.active { border-color: var(--c-primary); background: var(--c-primary-light); color: var(--c-primary); }

.age-panel { display: none; }
.age-panel.active { display: block; }

.age-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.age-card { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--c-radius); padding: 20px; box-shadow: var(--c-shadow); }
.age-card h3 { font-size: 0.9375rem; font-weight: 700; margin-bottom: 8px; }
.age-card p { font-size: 0.875rem; color: var(--c-text-light); }

/* ===== INFECTION SOURCES ===== */
.sources-section { background: var(--c-surface); }

.sources-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.source-card { background: var(--c-bg); border: 1px solid var(--c-border); border-radius: var(--c-radius); padding: 20px; box-shadow: var(--c-shadow); }
.source-header { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.source-icon { font-size: 1.5rem; }
.source-card h3 { font-size: 0.9375rem; font-weight: 700; }
.source-timeline { margin-bottom: 10px; }
.source-time { display: inline-block; background: var(--c-amber-light); color: var(--c-warn); font-size: 0.75rem; font-weight: 600; padding: 3px 10px; border-radius: 999px; }
.source-card > p { font-size: 0.875rem; color: var(--c-text-light); margin-bottom: 12px; }
.source-watch { font-size: 0.8125rem; color: var(--c-text); background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--c-radius-sm); padding: 10px 14px; }

/* ===== FRIDGE CARD ===== */
.fridge-section { background: var(--c-bg); }
.fridge-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: start; }
.fridge-intro h2 { font-size: 1.5rem; font-weight: 700; margin-bottom: 8px; }
.fridge-intro p { color: var(--c-text-light); margin-bottom: 20px; }

.fridge-card { background: #fff; border: 3px solid var(--c-primary); border-radius: var(--c-radius); padding: 24px; box-shadow: var(--c-shadow-lg); }
.fc-header { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; padding-bottom: 16px; border-bottom: 2px solid var(--c-primary); }
.fc-icon { width: 36px; height: 36px; flex-shrink: 0; }
.fc-header h3 { font-size: 1.125rem; font-weight: 800; color: var(--c-primary); letter-spacing: 0.04em; }
.fc-sub { font-size: 0.8125rem; color: var(--c-text-light); }

.fc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 16px; }
.fc-item { display: flex; align-items: flex-start; gap: 10px; font-size: 0.8125rem; }
.fc-letter { display: inline-flex; align-items: center; justify-content: center; width: 28px; height: 28px; border-radius: 50%; background: var(--c-primary); color: #fff; font-weight: 800; font-size: 0.875rem; flex-shrink: 0; }

.fc-actions { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.fc-action { font-size: 0.8125rem; padding: 8px 12px; background: var(--c-surface-alt); border-radius: var(--c-radius-sm); border-left: 3px solid var(--c-amber); }

.fc-emergency { background: var(--c-primary-light); border: 2px solid #fecaca; border-radius: var(--c-radius-sm); padding: 14px; margin-bottom: 16px; }
.fc-emergency p { font-size: 0.875rem; color: var(--c-danger); font-weight: 600; }
.fc-emergency p + p { margin-top: 4px; font-weight: 400; color: var(--c-text); }

.fc-footer { display: flex; justify-content: space-between; font-size: 0.6875rem; color: var(--c-text-muted); padding-top: 12px; border-top: 1px solid var(--c-border); }

/* ===== FAQ ===== */
.faq-section { background: var(--c-surface); }
.faq-list { max-width: 720px; }
.faq-item { border: 1px solid var(--c-border); border-radius: var(--c-radius-sm); margin-bottom: 8px; overflow: hidden; }
.faq-item summary { padding: 16px 20px; font-weight: 600; font-size: 0.9375rem; cursor: pointer; list-style: none; display: flex; align-items: center; justify-content: space-between; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; font-size: 1.25rem; font-weight: 400; color: var(--c-text-muted); transition: transform 0.2s; }
.faq-item[open] summary::after { content: '−'; }
.faq-item summary:hover { background: var(--c-surface-alt); }
.faq-item p { padding: 0 20px 16px; font-size: 0.875rem; color: var(--c-text-light); line-height: 1.7; }

/* ===== ASSUMPTIONS ===== */
.assumptions-section { padding: 40px 0; }
.assumptions-box { background: var(--c-surface-alt); border: 1px solid var(--c-border); border-radius: var(--c-radius); padding: 24px; }
.assumptions-box h3 { font-size: 0.9375rem; font-weight: 700; margin-bottom: 10px; }
.assumptions-box h3 + h3 { margin-top: 20px; }
.assumptions-box ul { list-style: none; }
.assumptions-box li { padding: 4px 0; font-size: 0.875rem; color: var(--c-text-light); padding-left: 18px; position: relative; }
.assumptions-box li::before { content: ''; position: absolute; left: 0; top: 12px; width: 5px; height: 5px; border-radius: 50%; background: var(--c-text-muted); }

/* ===== FOOTER ===== */
.site-footer { background: var(--c-text); color: #d6d3d1; padding: 48px 0 24px; }
.site-footer a { color: #fbbf24; }
.site-footer a:hover { color: #fde68a; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 32px; margin-bottom: 32px; }
.footer-brand p { font-size: 0.875rem; color: #a8a29e; margin-top: 8px; }
.footer-nav h4, .footer-ecosystem h4 { font-size: 0.8125rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: #d6d3d1; margin-bottom: 12px; }
.footer-nav ul { list-style: none; }
.footer-nav li { margin-bottom: 6px; }
.footer-nav a { font-size: 0.875rem; text-decoration: none; }
.footer-ecosystem p { font-size: 0.875rem; color: #a8a29e; margin-bottom: 6px; }
.footer-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; padding-top: 20px; border-top: 1px solid #44403c; font-size: 0.75rem; color: #78716c; }

/* ===== PRINT ===== */
@media print {
  .site-header, .site-footer, .hero-actions, .hero-note, .hero-stat, .timeline-nav, .age-tabs, .fridge-intro, .assumptions-section, .faq-section, #print-btn { display: none !important; }
  body { background: #fff; color: #000; }
  .fridge-card { border: 3px solid #000; box-shadow: none; page-break-inside: avoid; }
  .fridge-layout { display: block; }
  .fc-letter { border: 2px solid #000; color: #000; background: #fff; }
  .fc-emergency { border: 2px solid #000; background: #fff; }
  .fc-header { border-bottom-color: #000; }
  .fc-header h3 { color: #000; }
  .fc-emergency p { color: #000; }
  section { padding: 16px 0; }
  .fridge-section { background: #fff; }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .hero .container { grid-template-columns: 1fr; gap: 24px; }
  .hero-stat { display: grid; grid-template-columns: repeat(3, 1fr); }
  .tl-grid { grid-template-columns: 1fr; }
  .age-grid { grid-template-columns: 1fr 1fr; }
  .sources-grid { grid-template-columns: 1fr 1fr; }
  .fridge-layout { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .main-nav { display: none; }
  .nav-toggle { display: flex; }
  .hero { padding: 40px 0 32px; }
  .hero h1 { font-size: 1.75rem; }
  .hero-stat { grid-template-columns: 1fr; }
  .stat-card { padding: 14px; }
  .stat-number { font-size: 1.375rem; }
  .timeline-nav { flex-wrap: nowrap; }
  .tl-nav-btn { min-width: 80px; padding: 10px 8px; }
  .age-grid { grid-template-columns: 1fr; }
  .sources-grid { grid-template-columns: 1fr; }
  .fc-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; }
  section { padding: 40px 0; }
  .container { padding: 0 16px; }
}



/* Factory-injected deployment helpers. The AI owns the site design above this block. */
.ad-unit {
  width: min(100%, 720px);
  min-height: 120px;
  margin: 24px auto;
  display: block;
}

.legal-page {
  width: min(900px, calc(100% - 32px));
  margin: 40px auto;
}

.factory-fallback-nav {
  width: min(900px, calc(100% - 32px));
  margin: 24px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  font-size: 0.95rem;
}

.factory-fallback-nav a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}