:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #1a1d26;
  --muted: #5c6370;
  --accent: #0d4f4c;
  --accent-soft: #e8f2f1;
  --border: #e2e5eb;
  --positive: #1b7f6a;
  --warn: #b45309;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

a {
  color: var(--accent);
}

.wrap {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
}

header.hero {
  background: linear-gradient(135deg, #0d4f4c 0%, #1a6b66 50%, #0f3d3a 100%);
  color: #fff;
  padding: 2.75rem 1.25rem 2.25rem;
  margin-bottom: 2rem;
}

header.hero .wrap {
  padding-bottom: 0;
}

header.hero h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 650;
  letter-spacing: -0.02em;
}

header.hero p.lead {
  margin: 0;
  max-width: 40rem;
  opacity: 0.92;
  font-size: 1.05rem;
}

.meta-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin-top: 1.25rem;
  font-size: 0.875rem;
  opacity: 0.9;
}

.meta-bar span {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.35rem 1.5rem;
  margin-bottom: 1.25rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.card h2 {
  margin: 0 0 0.75rem;
  font-size: 1.15rem;
  font-weight: 650;
  color: var(--text);
}

.card h3 {
  margin: 1.25rem 0 0.5rem;
  font-size: 1rem;
  font-weight: 600;
}

.card p,
.card li {
  color: var(--muted);
  margin: 0.5rem 0;
}

.card ul {
  margin: 0.5rem 0 0;
  padding-left: 1.2rem;
}

.stat-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 0.5rem;
}

@media (max-width: 520px) {
  .stat-row {
    grid-template-columns: 1fr;
  }
}

.stat {
  background: var(--accent-soft);
  border-radius: 10px;
  padding: 1rem 1.1rem;
  text-align: center;
}

.stat .num {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.1;
}

.stat .lbl {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.25rem;
}

.badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--accent);
}

.proto-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: start;
  gap: 1rem;
  margin-top: 1rem;
}

@media (max-width: 600px) {
  .proto-grid {
    grid-template-columns: 1fr;
  }
}

.proto {
  margin: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
  background: #fafbfc;
}

.proto img {
  display: block;
  width: 100%;
  max-width: 320px;
  height: auto;
  margin: 0 auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
}

.proto figcaption {
  margin-top: 0.85rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.proto figcaption strong {
  display: block;
  margin: 0.4rem 0 0.2rem;
  color: var(--text);
}

.card p.proto-note {
  margin-top: 1rem;
  font-size: 0.85rem;
}

.participant-grid {
  display: grid;
  gap: 1rem;
}

.participant {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.15rem;
  background: #fafbfc;
}

.participant h4 {
  margin: 0 0 0.35rem;
  font-size: 0.95rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.participant .pref {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--positive);
}

.participant .pref.minimal {
  color: var(--warn);
}

.participant p {
  margin: 0.35rem 0 0;
  font-size: 0.9rem;
  color: var(--muted);
}

footer {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--muted);
}

nav.toc {
  margin-bottom: 1.5rem;
}

nav.toc a {
  margin-right: 1rem;
  font-size: 0.9rem;
}