:root{--bg:#fff;--fg:#1c2530;--muted:#5d6b7a;--brand:#0f5c4d;--brand2:#e9f4f1;--line:#e3e8ec;--warn:#fff7e6}
@media(prefers-color-scheme:dark){:root{--bg:#10161c;--fg:#e8edf1;--muted:#9fb0bf;--brand:#5fc8b0;--brand2:#16262a;--line:#26323c;--warn:#2a2415}}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font:17px/1.75 system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;background:var(--bg);color:var(--fg)}
a{color:var(--brand)}
.wrap{max-width:760px;margin:0 auto;padding:0 18px}
header.site{border-bottom:1px solid var(--line);position:sticky;top:0;background:var(--bg);z-index:5}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;height:58px}
header.site a.brand{font-weight:800;text-decoration:none;color:var(--fg);letter-spacing:.2px}
header.site nav a{margin-left:16px;text-decoration:none;color:var(--muted);font-size:15px}
h1{font-size:clamp(26px,5vw,38px);line-height:1.25;margin:28px 0 8px}
h2{font-size:clamp(21px,3.6vw,27px);line-height:1.3;margin:40px 0 10px;scroll-margin-top:70px}
h3{font-size:19px;margin:24px 0 6px}
.meta{color:var(--muted);font-size:14px;margin-bottom:18px}
.lead{font-size:18px;color:var(--muted)}
.toc{background:var(--brand2);border-radius:12px;padding:14px 20px;margin:22px 0}
.toc strong{display:block;margin-bottom:4px}.toc ol{margin:0;padding-left:20px}.toc li{margin:2px 0}
table{width:100%;border-collapse:collapse;margin:16px 0;font-size:15.5px}
th,td{border:1px solid var(--line);padding:9px 11px;text-align:left;vertical-align:top}
th{background:var(--brand2)}
.tablewrap{overflow-x:auto}
.note{background:var(--warn);border-left:4px solid #e0a100;padding:12px 16px;border-radius:6px;margin:20px 0;font-size:15.5px}
.cta{background:var(--brand);color:#fff;border-radius:14px;padding:22px;margin:36px 0;text-align:center}
.cta h2{margin:0 0 6px;color:#fff;font-size:22px}.cta p{margin:6px 0 14px;color:#e8f5f1}
.cta a.btn{display:inline-block;background:#fff;color:#0f5c4d;font-weight:700;padding:11px 24px;border-radius:999px;text-decoration:none}
details{border:1px solid var(--line);border-radius:10px;padding:10px 14px;margin:10px 0}
summary{cursor:pointer;font-weight:600}
ul.posts{list-style:none;padding:0}
ul.posts li{border:1px solid var(--line);border-radius:12px;padding:16px 18px;margin:14px 0}
ul.posts a.t{font-size:20px;font-weight:700;text-decoration:none}
ul.posts p{margin:6px 0 0;color:var(--muted);font-size:15.5px}
.src{font-size:14.5px;color:var(--muted)}
footer.site{border-top:1px solid var(--line);margin-top:50px;padding:22px 0;color:var(--muted);font-size:14px}