:root {
  color-scheme: light dark;
  --primary: #4a8dff;
  --primary-dark: #2563eb;
  --accent: #818cf8;
  --background: #ffffff;
  --surface: #f8fafc;
  --border: #e2e8f0;
  --text: #111827;
  --muted: #64748b;
  --shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #0f1117;
    --surface: #1e2128;
    --border: #2d3139;
    --text: #f8fafc;
    --muted: #a1a1aa;
    --shadow: 0 16px 40px rgba(0, 0, 0, 0.28);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.75;
}

a {
  color: var(--primary-dark);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--background) 88%, transparent);
  backdrop-filter: blur(16px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  align-items: center;
  display: flex;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 920px;
  padding: 16px 24px;
}

.brand {
  color: var(--text);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0;
}

.nav {
  display: flex;
  gap: 18px;
  font-size: 15px;
  flex-wrap: wrap;
}

.language-switcher {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.language-switcher a {
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text);
  font-size: 14px;
  padding: 6px 12px;
}

.language-switcher a[aria-current="page"] {
  background: var(--primary);
  border-color: var(--primary);
  color: #ffffff;
}

.page {
  margin: 0 auto;
  max-width: 920px;
  padding: 56px 24px 80px;
}

.hero {
  margin-bottom: 40px;
}

.eyebrow {
  color: var(--primary-dark);
  font-size: 14px;
  font-weight: 700;
  margin: 0 0 8px;
}

h1 {
  font-size: 40px;
  line-height: 1.2;
  margin: 0 0 12px;
}

.lead {
  color: var(--muted);
  font-size: 18px;
  margin: 0;
  max-width: 720px;
}

.doc {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 28px;
}

.doc h2 {
  border-top: 1px solid var(--border);
  font-size: 22px;
  margin: 32px 0 8px;
  padding-top: 28px;
}

.doc h2:first-child {
  border-top: 0;
  margin-top: 0;
  padding-top: 0;
}

.doc p,
.doc li {
  font-size: 16px;
}

.doc ul {
  padding-left: 22px;
}

.updated {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 24px;
}

.home-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.home-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  color: var(--text);
  display: block;
  padding: 24px;
}

.home-card strong {
  display: block;
  font-size: 20px;
  margin-bottom: 8px;
}

.home-card span {
  color: var(--muted);
}

.site-footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
  padding: 28px 24px;
  text-align: center;
}

@media (max-width: 640px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }

  .nav {
    gap: 14px;
  }

  .page {
    padding-top: 40px;
  }

  h1 {
    font-size: 32px;
  }

  .doc {
    border-radius: 12px;
    padding: 22px;
  }

  .home-grid {
    grid-template-columns: 1fr;
  }
}