/* ==========================================================================
   rare-disease-atlas.github.io — Autonomous Research Briefing Node Stylesheet
   Zero external fonts. Zero tracking. Pure static S3 delivery (<12KB).
   ========================================================================== */

:root {
  --bg-paper: #f8f7f3;
  --bg-surface: #ffffff;
  --bg-subtle: #efede6;
  --bg-terminal: #121518;
  --bg-terminal-elevated: #1b2026;
  --ink-primary: #111417;
  --ink-secondary: #3d444d;
  --ink-muted: #636c76;
  --ink-terminal: #e6edf3;
  --ink-terminal-muted: #9198a1;
  --accent-crimson: #9f1d20;
  --accent-crimson-soft: #fbeeee;
  --accent-emerald: #116329;
  --accent-emerald-soft: #dafbe1;
  --accent-amber: #9a6700;
  --accent-amber-soft: #fff8c5;
  --border-hairline: #d5d2c8;
  --border-strong: #111417;
  --font-serif: Charter, "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --max-width: 1080px;
  --radius-sm: 3px;
  --radius-md: 6px;
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-paper);
  color: var(--ink-primary);
  font-family: var(--font-sans);
  line-height: 1.62;
}

a {
  color: var(--accent-crimson);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

a:hover, a:focus-visible {
  color: var(--ink-primary);
  text-decoration-thickness: 2px;
}

code, pre, kbd, .mono {
  font-family: var(--font-mono);
}

code {
  font-size: 0.875em;
  background: var(--bg-subtle);
  padding: 0.12em 0.38em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-hairline);
}

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink-primary);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 1000;
}
.skip-link:focus {
  left: 0.5rem;
  top: 0.5rem;
}

/* Top Protocol Telemetry Bar */
.protocol-bar {
  background: var(--bg-terminal);
  color: var(--ink-terminal);
  border-bottom: 2px solid var(--accent-crimson);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  padding: 0.55rem 1.25rem;
}

.protocol-bar__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.25rem;
}

.protocol-status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  letter-spacing: 0.02em;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #2ea043;
  display: inline-block;
  box-shadow: 0 0 0 3px rgba(46, 160, 67, 0.22);
}

.protocol-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.protocol-links a {
  color: #f0f6fc;
  text-decoration: none;
  border-bottom: 1px dotted var(--ink-terminal-muted);
}

.protocol-links a:hover {
  color: #ff7b72;
  border-bottom-color: #ff7b72;
}

/* Site Navigation Header */
.site-header {
  border-bottom: 1px solid var(--border-hairline);
  background: var(--bg-surface);
}

.site-header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
}

.brand-mark {
  text-decoration: none;
  color: var(--ink-primary);
  display: flex;
  flex-direction: column;
}

.brand-mark__domain {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
}

.brand-mark__sub {
  font-size: 0.76rem;
  color: var(--ink-muted);
  font-family: var(--font-mono);
}

.funnel-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.5rem;
  align-items: center;
}

.funnel-nav a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-decoration: none;
  color: var(--ink-secondary);
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
}

.funnel-nav a:hover {
  background: var(--bg-subtle);
  color: var(--ink-primary);
}

.funnel-nav a[aria-current="page"] {
  background: var(--ink-primary);
  color: #ffffff;
  font-weight: 600;
}

/* Main Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

/* Human Context Viral Banner */
.origin-banner {
  background: var(--accent-crimson-soft);
  border: 1px solid #e2b4b5;
  border-left: 4px solid var(--accent-crimson);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1.15rem;
  margin-bottom: 1.75rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.25rem;
}

.origin-banner p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--ink-primary);
}

.origin-banner strong {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--accent-crimson);
}

/* Hero / Dossier Title */
.dossier-hero {
  border-bottom: 2px solid var(--border-strong);
  padding-bottom: 1.75rem;
  margin-bottom: 1.75rem;
}

.dossier-kicker {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-crimson);
  font-weight: 700;
  margin: 0 0 0.5rem 0;
}

.dossier-title {
  font-family: var(--font-serif);
  font-size: clamp(1.85rem, 3.6vw, 2.75rem);
  line-height: 1.16;
  letter-spacing: -0.015em;
  margin: 0 0 1rem 0;
  color: var(--ink-primary);
}

/* GEO Front-Loaded Quick Answer Box (40-80 words) */
.quick-answer {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-left: 4px solid var(--ink-primary);
  padding: 1.1rem 1.25rem;
  margin: 1.25rem 0 0;
  border-radius: var(--radius-sm);
}

.quick-answer__label {
  font-family: var(--font-mono);
  font-size: 0.73rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-muted);
  display: block;
  margin-bottom: 0.35rem;
}

.quick-answer p {
  margin: 0;
  font-size: 1.02rem;
  line-height: 1.55;
  color: var(--ink-primary);
}

/* Dual View Mode Switcher (Progressive Enhancement) */
.view-switcher {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.5rem 0 2rem;
  padding: 0.4rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
}

.view-btn {
  flex: 1 1 220px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.65rem 0.9rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--ink-secondary);
  cursor: pointer;
  text-align: center;
  transition: background 0.12s ease, color 0.12s ease;
}

.view-btn:hover {
  color: var(--ink-primary);
  background: rgba(255, 255, 255, 0.55);
}

.view-btn[aria-selected="true"] {
  background: var(--bg-surface);
  color: var(--ink-primary);
  border-color: var(--border-strong);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.06);
}

.js-mode-hidden {
  display: none !important;
}

/* Key Metric Stat Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 1rem;
  margin: 1.75rem 0;
}

.metric-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  padding: 1.05rem 1.15rem;
  border-radius: var(--radius-sm);
}

.metric-card__value {
  font-family: var(--font-mono);
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--ink-primary);
  line-height: 1.2;
  margin-bottom: 0.25rem;
}

.metric-card__label {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--accent-crimson);
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.metric-card__desc {
  font-size: 0.85rem;
  color: var(--ink-secondary);
  margin: 0;
  line-height: 1.45;
}

/* Section Typography */
.dossier-section {
  margin: 2.75rem 0;
  padding-top: 0.5rem;
}

.section-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  display: block;
  margin-bottom: 0.25rem;
}

h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.35rem, 2.4vw, 1.75rem);
  line-height: 1.25;
  margin: 0 0 0.85rem 0;
  color: var(--ink-primary);
}

h3 {
  font-family: var(--font-sans);
  font-size: 1.08rem;
  font-weight: 700;
  margin: 1.4rem 0 0.5rem 0;
  color: var(--ink-primary);
}

p {
  margin: 0 0 1rem 0;
  color: var(--ink-secondary);
}

ul, ol {
  margin: 0 0 1.2rem 0;
  padding-left: 1.35rem;
  color: var(--ink-secondary);
}

li {
  margin-bottom: 0.45rem;
}

li strong {
  color: var(--ink-primary);
}

/* Tables for GEO Extraction */
.table-wrap {
  overflow-x: auto;
  margin: 1.25rem 0 1.75rem;
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  text-align: left;
}

thead {
  background: var(--bg-subtle);
  border-bottom: 2px solid var(--border-strong);
}

th {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-primary);
  padding: 0.75rem 0.9rem;
  white-space: nowrap;
}

td {
  padding: 0.8rem 0.9rem;
  border-bottom: 1px solid var(--border-hairline);
  vertical-align: top;
  color: var(--ink-secondary);
}

tbody tr:last-child td {
  border-bottom: none;
}

tbody tr.highlight-row {
  background: #fff9f8;
}

tbody tr.highlight-row td {
  color: var(--ink-primary);
}

/* Status & Evidence Badges */
.badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.badge--high {
  background: var(--accent-emerald-soft);
  color: var(--accent-emerald);
}

.badge--warn {
  background: var(--accent-amber-soft);
  color: var(--accent-amber);
}

.badge--gap {
  background: var(--accent-crimson-soft);
  color: var(--accent-crimson);
}

/* Skill-Routing Cards */
.routing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.15rem;
  margin: 1.25rem 0;
}

.route-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-top: 3px solid var(--ink-primary);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.route-card--accent {
  border-top-color: var(--accent-crimson);
}

.route-card__role {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-crimson);
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.route-card h3 {
  margin-top: 0;
  font-family: var(--font-serif);
  font-size: 1.22rem;
}

.route-card__cta {
  margin-top: 1rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--border-hairline);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
}

/* Interactive "Test With Your Agent" Viral Loop Box */
.agent-tester {
  background: var(--bg-terminal);
  color: var(--ink-terminal);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin: 2.25rem 0;
  border: 1px solid #30363d;
}

.agent-tester__header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.agent-tester h2 {
  color: #ffffff;
  font-family: var(--font-serif);
  margin: 0.15rem 0 0.35rem;
  font-size: 1.45rem;
}

.agent-tester p {
  color: var(--ink-terminal-muted);
  font-size: 0.9rem;
  margin: 0;
}

.persona-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 1rem 0;
}

.persona-tab {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  background: var(--bg-terminal-elevated);
  color: var(--ink-terminal-muted);
  border: 1px solid #30363d;
  padding: 0.45rem 0.8rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.persona-tab:hover {
  color: #ffffff;
  border-color: #8b949e;
}

.persona-tab[aria-selected="true"] {
  background: var(--accent-crimson);
  color: #ffffff;
  border-color: #ff7b72;
  font-weight: 600;
}

.prompt-box {
  background: #090c10;
  border: 1px solid #30363d;
  border-radius: var(--radius-sm);
  padding: 1rem 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.83rem;
  line-height: 1.55;
  color: #e6edf3;
  white-space: pre-wrap;
  word-break: break-word;
  margin-bottom: 1rem;
}

.tester-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
}

.btn-primary {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  background: #ffffff;
  color: var(--bg-terminal);
  border: 1px solid #ffffff;
  padding: 0.55rem 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-primary:hover {
  background: #e6edf3;
  color: #000000;
}

.btn-outline-dark {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  background: var(--bg-terminal-elevated);
  color: var(--ink-terminal);
  border: 1px solid #3d444d;
  padding: 0.52rem 0.85rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

.btn-outline-dark:hover {
  border-color: #f0f6fc;
  color: #ffffff;
}

.btn-subtle {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  background: var(--bg-surface);
  color: var(--ink-primary);
  border: 1px solid var(--border-strong);
  padding: 0.42rem 0.8rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
}

.btn-subtle:hover {
  background: var(--ink-primary);
  color: #ffffff;
}

/* Human Context Letter Card */
.human-letter {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-top: 4px solid var(--accent-crimson);
  border-radius: var(--radius-sm);
  padding: 1.75rem 2rem;
  margin: 1.5rem 0 2.5rem;
}

.human-letter h2 {
  font-family: var(--font-serif);
  margin-top: 0;
}

.human-letter p {
  font-size: 1.02rem;
  line-height: 1.7;
  color: var(--ink-primary);
}

.transparency-callout {
  background: var(--bg-subtle);
  border-left: 3px solid var(--ink-primary);
  padding: 0.9rem 1.1rem;
  font-size: 0.88rem;
  margin-top: 1.25rem;
}

/* FAQ Accordion / Semantic DL */
.faq-list {
  display: grid;
  gap: 1rem;
  margin: 1.25rem 0;
}

.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  padding: 1.1rem 1.25rem;
}

.faq-item h3 {
  margin: 0 0 0.45rem 0;
  font-family: var(--font-serif);
  font-size: 1.12rem;
}

.faq-item p {
  margin: 0;
  font-size: 0.93rem;
}

/* Footer */
.site-footer {
  border-top: 2px solid var(--border-strong);
  background: var(--bg-subtle);
  padding: 2.25rem 1.25rem;
  font-size: 0.84rem;
  color: var(--ink-secondary);
}

.site-footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.site-footer h4 {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-primary);
  margin: 0 0 0.6rem 0;
}

.site-footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.site-footer li {
  margin-bottom: 0.35rem;
}

.disclaimer-bar {
  max-width: var(--max-width);
  margin: 1.5rem auto 0;
  padding-top: 1.1rem;
  border-top: 1px solid var(--border-hairline);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--ink-muted);
}

@media (max-width: 680px) {
  .human-letter {
    padding: 1.25rem;
  }
  .agent-tester {
    padding: 1.1rem;
  }
  .protocol-bar {
    font-size: 0.7rem;
  }
}

@media print {
  .protocol-bar, .view-switcher, .agent-tester {
    display: none;
  }
  .js-mode-hidden {
    display: block !important;
  }
  body {
    background: #fff;
  }
}