:root{--bg:#F8F9FA;--card:#fff;--text:#0F172A;--muted:#64748B;--accent:#6366F1;--border:rgba(0,0,0,.06)}
@media (prefers-color-scheme:dark){:root{--bg:#0E1116;--card:#1A1E26;--text:#F8FAFC;--muted:#94A3B8;--accent:#818CF8;--border:rgba(255,255,255,.08)}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 -apple-system,"SF Pro Text","Be Vietnam Pro",system-ui,sans-serif}
main{max-width:720px;margin:0 auto;padding:40px 16px 80px}
header{display:flex;align-items:center;gap:14px;margin-bottom:28px}header img{width:56px;height:56px;border-radius:13px}
h1{font-size:28px;line-height:1.2;margin:0}h2{font-size:19px;margin:28px 0 8px}.muted{color:var(--muted);font-size:14px}
section{background:var(--card);border:1px solid var(--border);border-radius:18px;padding:20px 22px;margin-bottom:16px}
a{color:var(--accent)}nav{display:flex;gap:16px;margin:8px 0 24px;font-size:14px}ul{padding-left:20px}