:root{--ink:#0f1b2d;--muted:#5b6b82;--line:#e3e9f1;--pri:#0f6fde;--bg:#f6f8fb;--ph:#fff4c2}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:15.5px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
.wrap{max-width:820px;margin:0 auto;padding:22px 16px 60px}
header{display:flex;align-items:center;gap:12px;margin-bottom:6px}
header img{width:40px;height:40px;border-radius:10px}
header b{font-size:18px}header span{display:block;font-size:12.5px;color:var(--muted)}
h1{font-size:25px;line-height:1.25;margin:18px 0 4px}
.meta{color:var(--muted);font-size:13.5px;margin-bottom:16px}
.card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 20px;margin:14px 0}
h2{font-size:18px;margin:26px 0 8px;scroll-margin-top:12px}
h3{font-size:15.5px;margin:18px 0 6px}
p{margin:8px 0}ul,ol{padding-left:22px;margin:8px 0}li{margin:4px 0}
.toc ol{columns:2;column-gap:28px;font-size:14px}.toc li{break-inside:avoid}
@media(max-width:620px){.toc ol{columns:1}}
a{color:var(--pri)}
.ph{background:var(--ph);border-radius:4px;padding:0 4px;font-weight:600}
.note{background:#eef5ff;border-left:4px solid var(--pri);border-radius:8px;padding:10px 14px;margin:12px 0;font-size:14.5px}
.draft{background:#fff8e6;border:1px solid #f3d27a;border-radius:10px;padding:10px 14px;font-size:13.5px;color:#6b5000}
table{width:100%;border-collapse:collapse;font-size:14px;margin:10px 0}
th,td{border:1px solid var(--line);padding:8px 10px;text-align:left;vertical-align:top}
th{background:#f1f5fa}
.tw{overflow-x:auto}
footer{margin-top:30px;color:var(--muted);font-size:13px;text-align:center}
@media print{body{background:#fff}.card{border:0;padding:0}.draft,.toc{display:none}}