:root { --o:#e8821e; --cream:#fff6ea; --brown:#3f1808; --red:#d52b1e; --text:#2a1a10; --muted:#7a6656; --bg:#fffdfa; --card:#fff; --line:#f0e1d0; }
@media (prefers-color-scheme: dark) { :root { --text:#f5e8da; --muted:#b9a592; --bg:#1d1612; --card:#271d17; --line:#3a2c22; --cream:#2a1f18; } }
* { box-sizing: border-box; }
body { margin:0; font:16px/1.7 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif; color:var(--text); background:var(--bg); }
a { color:var(--red); }
header, main, footer { max-width: 960px; margin: 0 auto; padding: 0 20px; }
header { display:flex; align-items:center; justify-content:space-between; height:64px; }
header .brand { display:flex; align-items:center; gap:10px; font-weight:700; color:var(--text); text-decoration:none; }
header img { width:32px; height:32px; }
header nav a { margin-left:20px; color:var(--muted); text-decoration:none; font-size:15px; }
.hero { display:grid; grid-template-columns: 1.2fr .8fr; gap:32px; align-items:center; padding:48px 0 32px; }
.hero h1 { font-size:40px; line-height:1.25; margin:0 0 12px; }
.hero p.lead { font-size:18px; color:var(--muted); margin:0 0 24px; }
.hero img { width:100%; max-width:340px; justify-self:center; }
.btn { display:inline-block; padding:12px 22px; border-radius:12px; background:var(--o); color:#fff; font-weight:700; text-decoration:none; margin-right:10px; }
.btn.alt { background:transparent; color:var(--text); border:2px solid var(--line); }
.features { display:grid; grid-template-columns:repeat(auto-fit,minmax(260px,1fr)); gap:16px; padding:16px 0 32px; }
.card { background:var(--card); border:1px solid var(--line); border-radius:16px; padding:20px; }
.card h3 { margin:0 0 6px; font-size:18px; }
.card p { margin:0; color:var(--muted); }
h2 { margin:32px 0 12px; }
.note { background:var(--cream); border:1px dashed var(--o); border-radius:12px; padding:12px 16px; font-size:14px; color:var(--muted); }
.doc h1 { font-size:30px; } .doc h2 { font-size:20px; } .doc li { margin:4px 0; }
footer { padding:32px 20px 48px; color:var(--muted); font-size:14px; border-top:1px solid var(--line); margin-top:40px; }
footer a { color:var(--muted); margin-right:16px; }
@media (max-width:720px) { .hero { grid-template-columns:1fr; } .hero h1 { font-size:30px; } }