:root { color-scheme: light dark; --fg: #1f2328; --muted: #59636e; --bg: #ffffff; --border: #d1d9e0; --accent: #0969da; --card: #f6f8fa; }
@media (prefers-color-scheme: dark) { :root { --fg: #e6edf3; --muted: #9198a1; --bg: #0d1117; --border: #3d444d; --accent: #4493f8; --card: #151b23; } }
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif; color: var(--fg); background: var(--bg); }
main { max-width: 760px; margin: 0 auto; padding: 48px 20px 80px; }
header { display: flex; align-items: center; gap: 14px; margin-bottom: 8px; }
header img { width: 48px; height: 48px; }
h1 { font-size: 30px; margin: 0; }
h2 { font-size: 20px; margin: 40px 0 12px; }
.lead { font-size: 18px; color: var(--muted); margin: 8px 0 24px; }
a { color: var(--accent); }
.card { border: 1px solid var(--border); border-radius: 8px; background: var(--card); padding: 16px 20px; }
.demo { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 14px; white-space: pre; margin: 0; }
ul { padding-left: 22px; }
li { margin: 6px 0; }
.btn { display: inline-block; padding: 8px 16px; border-radius: 6px; border: 1px solid var(--border); text-decoration: none; font-weight: 600; margin-right: 8px; }
.btn.primary { background: #1f883d; border-color: #1f883d; color: #fff; }
.muted { color: var(--muted); }
footer { margin-top: 56px; padding-top: 16px; border-top: 1px solid var(--border); color: var(--muted); font-size: 14px; }
code { font-size: 14px; background: rgba(175, 184, 193, .2); padding: 1px 5px; border-radius: 4px; }