:root {
  color-scheme: light;
  --bg: #f4fbfa;
  --surface: #ffffff;
  --surface-alt: #eef7f6;
  --border: #d8ece8;
  --border-strong: #beded8;
  --text: #113533;
  --text-muted: #4a6865;
  --accent: #0b8c83;
  --accent-strong: #086f69;
  --accent-soft: rgba(11, 140, 131, 0.1);
  --warning-soft: #fff6e6;
  --warning-border: #f2d7a4;
  --shadow: 0 18px 40px rgba(17, 53, 51, 0.08);
  --radius-lg: 24px;
  --radius-md: 16px;
  --max-width: 960px;
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family:
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  line-height: 1.6;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(11, 140, 131, 0.08), transparent 26rem),
    linear-gradient(180deg, #f8fdfc 0%, var(--bg) 100%);
}

a {
  color: var(--accent-strong);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.16em;
}

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

.site-shell {
  width: min(calc(100% - 2rem), var(--max-width));
  margin: 0 auto;
  padding: 1rem 0 3rem;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.5rem 0 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: inherit;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-mark {
  width: 2.6rem;
  height: 2.6rem;
  display: grid;
  place-items: center;
  border-radius: 18px;
  background: linear-gradient(145deg, var(--accent-soft), rgba(11, 140, 131, 0.18));
  color: var(--accent-strong);
  font-size: 1.2rem;
}

.topnav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.topnav a {
  display: inline-flex;
  align-items: center;
  padding: 0.65rem 0.95rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--border);
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 600;
}

.topnav a[aria-current="page"] {
  color: var(--accent-strong);
  background: var(--accent-soft);
  border-color: rgba(11, 140, 131, 0.22);
}

.hero {
  padding: 2rem;
  border-radius: 30px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.98), rgba(238, 247, 246, 0.98)),
    var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin: 0 0 0.85rem;
  padding: 0.4rem 0.7rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.9rem;
  font-weight: 700;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.hero p {
  max-width: 46rem;
  margin: 1rem 0 0;
  color: var(--text-muted);
  font-size: 1.05rem;
}

.hero-actions,
.card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 1.5rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 2.9rem;
  padding: 0.8rem 1.15rem;
  border-radius: 999px;
  border: 1px solid transparent;
  text-decoration: none;
  font-weight: 700;
}

.button-primary {
  color: white;
  background: linear-gradient(180deg, var(--accent), var(--accent-strong));
  box-shadow: 0 14px 26px rgba(8, 111, 105, 0.18);
}

.button-secondary {
  color: var(--accent-strong);
  background: white;
  border-color: var(--border-strong);
}

.page-grid {
  display: grid;
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.summary-grid {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}

.summary-grid.two-up {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card {
  padding: 1.25rem;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.card h2,
.card h3 {
  margin: 0;
  letter-spacing: -0.02em;
}

.card h2 {
  font-size: 1.3rem;
}

.card h3 {
  font-size: 1.02rem;
}

.card p,
.card li {
  color: var(--text-muted);
}

.card ul {
  margin: 0.75rem 0 0;
  padding-left: 1.2rem;
}

.card + .card {
  margin-top: 1rem;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.meta strong {
  color: var(--text);
}

.notice {
  padding: 1rem 1.1rem;
  border-radius: var(--radius-md);
  background: var(--warning-soft);
  border: 1px solid var(--warning-border);
}

.toc {
  display: grid;
  gap: 0.7rem;
}

.toc a {
  display: block;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  background: var(--surface-alt);
  border: 1px solid var(--border);
  text-decoration: none;
  font-weight: 600;
}

.section-stack {
  display: grid;
  gap: 1rem;
}

.footer {
  margin-top: 2rem;
  padding: 1rem 0 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.muted {
  color: var(--text-muted);
}

.placeholder {
  font-weight: 700;
  color: var(--accent-strong);
}

@media (max-width: 760px) {
  .site-shell {
    width: min(calc(100% - 1.25rem), var(--max-width));
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero {
    padding: 1.35rem;
    border-radius: 24px;
  }

  .summary-grid.two-up {
    grid-template-columns: 1fr;
  }
}