:root{color-scheme:light;--ink:#163044;--muted:#536777;--line:#dce5eb;--accent:#147b8a;--bg:#f5f8fa}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.8 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC",sans-serif}
a{color:var(--accent);text-underline-offset:4px}header,main,footer{max-width:960px;margin:auto;padding:24px}
header{display:flex;align-items:center;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line);flex-wrap:wrap}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);font-weight:700}.brand img{border-radius:11px}
nav{display:flex;gap:18px;flex-wrap:wrap}nav a{text-decoration:none}nav a[aria-current=page]{font-weight:700;text-decoration:underline}
article,.hero,.card{background:white;border:1px solid var(--line);border-radius:18px;padding:30px;margin:20px 0}h1{font-size:clamp(28px,5vw,42px);line-height:1.3;margin:0 0 16px}h2{font-size:23px;line-height:1.4;margin:30px 0 12px}h3{font-size:18px;margin:22px 0 8px}p{margin:10px 0}li{margin:7px 0}.meta,footer{color:var(--muted);font-size:14px}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.grid .card{margin:0}.button{display:inline-block;padding:10px 18px;background:var(--accent);color:white;border-radius:10px;text-decoration:none;margin:8px 12px 8px 0}.notice{border-left:4px solid var(--accent);padding:12px 18px;background:#edf6f7;border-radius:5px}.skip{position:absolute;left:20px;top:-60px}.skip:focus{top:10px;background:white;padding:8px;z-index:10}code{background:#edf1f4;padding:2px 6px;border-radius:5px;overflow-wrap:anywhere}footer{border-top:1px solid var(--line);margin-top:28px}a:focus-visible{outline:3px solid #e7a528;outline-offset:4px}
@media(max-width:600px){header,main,footer{padding:18px}article,.hero,.card{padding:22px}.grid{grid-template-columns:1fr}nav{gap:10px 16px}h2{font-size:21px}}