:root {
  --bg: #ffffff;
  --bg-secondary: #f8fafc;
  --card: #f1f5f9;
  --border: #e2e8f0;
  --text: #0f172a;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --accent: #0ea5e9;
  --accent-fg: #ffffff;
  --glass: rgba(255, 255, 255, 0.72);
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 8px 32px rgba(15, 23, 42, 0.06);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0f17;
    --bg-secondary: #141a26;
    --card: #1e2535;
    --border: #2d3748;
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --glass: rgba(20, 26, 38, 0.72);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 32px rgba(0, 0, 0, 0.4);
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
  background-image:
    radial-gradient(1200px 600px at 50% -100px, color-mix(in srgb, var(--accent) 12%, transparent), transparent),
    radial-gradient(800px 400px at 100% 100%, color-mix(in srgb, var(--accent) 6%, transparent), transparent);
  background-attachment: fixed;
  min-height: 100vh;
}
header {
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  background: var(--glass);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 760px; margin: 0 auto;
  padding: 14px 20px; display: flex; align-items: center; gap: 12px;
  flex-wrap: wrap;
}
.logo {
  width: 32px; height: 32px; border-radius: 8px;
  object-fit: cover; display: block;
  box-shadow: 0 1px 2px rgba(0,0,0,0.08);
}
.brand { font-weight: 600; font-size: 17px; letter-spacing: -0.01em; }
.brand a { color: inherit; text-decoration: none; }
.header-nav { margin-left: auto; display: flex; flex-wrap: wrap; gap: 8px 18px; font-size: 14px; }
.header-nav a { color: var(--text-secondary); text-decoration: none; }
.header-nav a:hover { color: var(--text); }
.header-nav a[aria-current="page"] { color: var(--text); font-weight: 500; }
main {
  max-width: 760px; margin: 0 auto;
  padding: 32px 20px 64px;
}
h1 {
  font-size: 34px; line-height: 1.15; letter-spacing: -0.025em;
  margin: 8px 0 6px; font-weight: 700;
}
.subtitle { color: var(--text-secondary); margin: 0 0 28px; }
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 16px; padding: 22px 24px; margin: 16px 0;
  box-shadow: var(--shadow);
}
.card h2 {
  margin: 0 0 12px; font-size: 13px; font-weight: 600;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--text-muted);
}
.card h2 + * { margin-top: 0; }
h3 {
  font-size: 18px; font-weight: 600; letter-spacing: -0.01em;
  margin: 18px 0 8px;
}
p { margin: 10px 0; }
ul { padding-left: 22px; margin: 10px 0; }
li { margin: 4px 0; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code {
  background: var(--bg-secondary); padding: 2px 6px; border-radius: 6px;
  font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 13.5px;
}
.meta { color: var(--text-muted); font-size: 14px; margin-top: 32px; text-align: center; }
.pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px; border-radius: 999px; font-size: 13px;
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  color: var(--accent); font-weight: 500;
}
.pill::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
}
.callout {
  border-left: 3px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  padding: 14px 18px; border-radius: 10px; margin: 14px 0;
}
.callout strong { color: var(--text); }
hr.sep { border: none; border-top: 1px solid var(--border); margin: 14px 0; }