:root{--ink:#1B2A41;--mute:#5b6b7f;--bg:#f4f6f3;--card:#fff;--line:#dfe6ee;--acc:#2a7d73;--tint:#e9f7f4}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--ink:#e8eef5;--mute:#a7b4c3;--bg:#11161d;--card:#18202a;--line:#2a3542;--acc:#7fd3c6;--tint:#16302c}}
:root[data-theme="dark"]{--ink:#e8eef5;--mute:#a7b4c3;--bg:#11161d;--card:#18202a;--line:#2a3542;--acc:#7fd3c6;--tint:#16302c}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
main{max-width:760px;margin:0 auto;padding:24px 16px 56px}
.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:26px 22px}
.top{display:flex;align-items:center;gap:12px;margin-bottom:6px}
.top img{width:44px;height:44px;border-radius:11px}
.top span{font-weight:700;font-size:18px}
h1{font-size:27px;line-height:1.25;margin:10px 0 4px;letter-spacing:-.3px}
.meta{color:var(--mute);font-size:14px;margin:0 0 18px}
h2{font-size:18px;margin:28px 0 6px;scroll-margin-top:16px}
h3{font-size:16px;margin:16px 0 4px}
p,li{margin:6px 0}
ul{padding-left:22px}
a{color:var(--acc)}
.summary{background:var(--tint);border-radius:12px;padding:12px 16px;margin:14px 0 6px}
.summary ul{margin:4px 0}
nav.toc{border:1px solid var(--line);border-radius:12px;padding:10px 16px;margin:16px 0;font-size:15px}
nav.toc ol{margin:4px 0;padding-left:22px;columns:2;column-gap:28px}
@media (max-width:560px){nav.toc ol{columns:1}}
table{border-collapse:collapse;width:100%;font-size:15px;margin:8px 0}
td,th{border-bottom:1px solid var(--line);padding:8px 6px;text-align:left;vertical-align:top}
.back{display:inline-block;margin-top:24px;font-weight:600}
footer{color:var(--mute);font-size:13px;margin-top:22px;text-align:center}
@media print{body{background:#fff;color:#000}.card{border:0;padding:0}nav.toc,.back{display:none}a{color:#000}}