:root{color-scheme:light;--ink:#172b4d;--muted:#52647d;--line:#d9e2ec;--blue:#1769aa;--wash:#f3f7fb}*{box-sizing:border-box}body{margin:0;background:var(--wash);color:var(--ink);font:17px/1.85 system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif}a{color:var(--blue)}header,main,footer{width:min(960px,calc(100% - 36px));margin:auto}header{padding:24px 0;border-bottom:1px solid var(--line)}header a{font-weight:700;text-decoration:none}main{padding:38px 0 64px}h1{font-size:clamp(2rem,5vw,3rem);line-height:1.25;margin:0 0 18px}h2{font-size:1.35rem;margin:32px 0 8px}p{margin:10px 0 18px}.intro{font-size:1.1rem;color:var(--muted)}article{padding:8px 0 14px;border-bottom:1px solid var(--line)}.related{display:flex;flex-wrap:wrap;gap:10px}.related a{padding:7px 12px;background:white;border:1px solid var(--line);border-radius:999px;text-decoration:none}footer{border-top:1px solid var(--line);padding:22px 0 36px;color:var(--muted)}.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;margin:24px 0}.card{display:block;padding:18px;background:white;border:1px solid var(--line);border-radius:12px;text-decoration:none}.card strong{display:block;font-size:1.08rem}.card span{color:var(--muted)}:focus-visible{outline:3px solid #84c5f4;outline-offset:3px}@media(max-width:600px){body{font-size:16px}main{padding-top:28px}}