:root{color-scheme:light;--ink:#303644;--muted:#616978;--paper:#f7fbfd;--line:#dce8ec;--orange:#bd4b24}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;font-size:17px;line-height:1.9}a{color:var(--orange);text-underline-offset:4px}a:focus-visible{outline:3px solid #55acd0;outline-offset:5px}header,main,footer{max-width:850px;margin:auto;padding:28px}header{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);gap:20px}header>a{font-size:25px;font-weight:800;color:var(--ink);text-decoration:none}nav{display:flex;gap:22px;font-size:15px}h1{font-size:clamp(30px,6vw,44px);line-height:1.4;margin:28px 0 16px}h2{font-size:22px;line-height:1.5;margin:35px 0 12px}p{margin:12px 0}small,.muted{color:var(--muted)}.intro{font-size:21px}.note{background:#fff3ec;border-left:3px solid #ed996d;padding:18px 22px;margin:28px 0}.contact{display:inline-block;background:white;border:1px solid var(--line);border-radius:12px;padding:12px 20px;margin:8px 0}section{scroll-margin-top:24px}li{margin-bottom:10px}footer{font-size:14px;color:var(--muted);border-top:1px solid var(--line);margin-top:32px;padding-bottom:44px}@media(max-width:500px){header,main,footer{padding:22px}header{align-items:flex-start}nav{gap:14px}body{font-size:16px}}