:root{--bg:#fff;--fg:#1d1d1f;--muted:#6e6e73;--accent:#2563eb;--card:#f5f5f7}
@media (prefers-color-scheme:dark){:root{--bg:#000;--fg:#f5f5f7;--muted:#a1a1a6;--accent:#5b8efa;--card:#1c1c1e}}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif}
main{max-width:720px;margin:0 auto;padding:40px 20px 80px}
h1{font-size:34px;line-height:1.15;margin:0 0 8px}h2{font-size:22px;margin:36px 0 8px}
p,li{color:var(--fg)}.muted{color:var(--muted)}a{color:var(--accent)}
.card{background:var(--card);border-radius:16px;padding:18px 20px;margin:16px 0}
header img{width:72px;height:72px;border-radius:16px}
/* guides */
.topbar{display:flex;align-items:center;gap:12px;max-width:720px;margin:0 auto;padding:20px 20px 0}
.topbar img{width:40px;height:40px;border-radius:10px}
.topbar a{color:var(--fg);font-weight:700;text-decoration:none}
.crumbs{font-size:14px;color:var(--muted);margin:0 0 20px}.crumbs a{color:var(--muted)}
.lead{font-size:19px;color:var(--muted)}
.cta{display:inline-block;background:var(--accent);color:#fff;text-decoration:none;font-weight:600;padding:12px 20px;border-radius:999px;margin:4px 0}
@media (prefers-color-scheme:dark){.cta{color:#000}}
.cta-end{margin-top:32px}
article h3{font-size:18px;margin:24px 0 6px}
article ul,article ol{padding-left:22px}article li{margin:6px 0}
.guide-list{list-style:none;padding:0;margin:20px 0}.guide-list li{margin:12px 0}.guide-list a{text-decoration:none}
.foot{margin-top:0}.foot main{padding:0 20px 40px;font-size:14px}
h1,h2{overflow-wrap:break-word}
@media (max-width:520px){h1{font-size:28px}}