:root {
  --bg: #ffffff;
  --bg-soft: #f7f7f8;
  --bg-elev: #ffffff;
  --fg: #0a0a0a;
  --fg-muted: #5b5b66;
  --fg-subtle: #8a8a96;
  --border: #e6e6ec;
  --border-strong: #d4d4dc;
  --accent: #4f46e5;
  --accent-soft: #eef2ff;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(10, 10, 10, 0.04), 0 4px 16px rgba(10, 10, 10, 0.04);
  --maxw: 760px;
  --font: ui-sans-serif, system-ui, -apple-system, "SF Pro Text", "Segoe UI",
    "Inter", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0a0b;
    --bg-soft: #111114;
    --bg-elev: #131316;
    --fg: #f4f4f6;
    --fg-muted: #a8a8b3;
    --fg-subtle: #6c6c78;
    --border: #1f1f24;
    --border-strong: #2a2a30;
    --accent: #818cf8;
    --accent-soft: #1c1f3a;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 4px 24px rgba(0, 0, 0, 0.35);
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
  background-image:
    radial-gradient(
      1200px 600px at 50% -200px,
      var(--accent-soft) 0%,
      transparent 60%
    );
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent);
  text-decoration: none;
  text-underline-offset: 3px;
}

a:hover {
  text-decoration: underline;
}

header.site {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  background: color-mix(in srgb, var(--bg) 75%, transparent);
  border-bottom: 1px solid var(--border);
}

header.site .inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

header.site .brand {
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--fg);
}

header.site nav {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

header.site nav a {
  color: var(--fg-muted);
  font-size: 14px;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
}

header.site nav a:hover {
  color: var(--fg);
  background: var(--bg-soft);
  text-decoration: none;
}

header.site nav a[aria-current="page"] {
  color: var(--fg);
  background: var(--bg-soft);
}

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 56px 24px 96px;
}

.hero {
  padding: 24px 0 8px;
}

.eyebrow {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-subtle);
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-soft);
}

h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin: 18px 0 12px;
  font-weight: 650;
}

h2 {
  font-size: 1.25rem;
  letter-spacing: -0.01em;
  margin: 40px 0 12px;
  font-weight: 600;
}

h3 {
  font-size: 1rem;
  margin: 24px 0 8px;
  font-weight: 600;
  color: var(--fg);
}

p {
  margin: 0 0 14px;
  color: var(--fg-muted);
}

.lead {
  font-size: 1.075rem;
  color: var(--fg-muted);
  max-width: 56ch;
}

.card {
  margin-top: 28px;
  padding: 24px 28px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

dl.kv {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 10px 24px;
  margin: 8px 0 0;
}

dl.kv dt {
  color: var(--fg-subtle);
  font-size: 14px;
  white-space: nowrap;
}

dl.kv dd {
  margin: 0;
  color: var(--fg);
  font-size: 15px;
}

@media (max-width: 560px) {
  dl.kv {
    grid-template-columns: 1fr;
    gap: 4px 0;
  }
  dl.kv dd {
    margin-bottom: 10px;
  }
}

ul.plain {
  padding-left: 18px;
  margin: 0 0 14px;
}

ul.plain li {
  color: var(--fg-muted);
  margin-bottom: 6px;
}

.divider {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 56px 0 32px;
}

.lang-tag {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-subtle);
  padding: 2px 8px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-soft);
  vertical-align: middle;
  margin-left: 10px;
}

footer.site {
  border-top: 1px solid var(--border);
  margin-top: 64px;
}

footer.site .inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 28px 24px 40px;
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  justify-content: space-between;
  align-items: center;
  color: var(--fg-subtle);
  font-size: 14px;
}

footer.site nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

footer.site nav a {
  color: var(--fg-muted);
}

.cta-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 15px;
  border: 1px solid var(--border-strong);
  background: var(--bg-elev);
  color: var(--fg);
  transition: transform 0.04s ease, background 0.15s ease, border-color 0.15s ease;
}

.btn:hover {
  text-decoration: none;
  background: var(--bg-soft);
}

.btn:active {
  transform: translateY(1px);
}

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.btn.primary:hover {
  filter: brightness(1.05);
  background: var(--accent);
}

code, .mono {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.92em;
  background: var(--bg-soft);
  padding: 1px 6px;
  border-radius: 6px;
  border: 1px solid var(--border);
}

::selection {
  background: var(--accent);
  color: white;
}