:root{color-scheme:light;--ink:#273831;--muted:#64756c;--accent:#42725b;--line:#dce4d9;--paper:#f7f8f1}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.8 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}a{color:var(--accent);text-underline-offset:4px}header,main,footer{max-width:1040px;margin:auto;padding:24px 36px}header{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;font-weight:700;font-size:23px;text-decoration:none;color:var(--ink)}.brand img{width:42px;height:42px;border-radius:11px}nav{display:flex;gap:24px}nav a{text-decoration:none;font-size:14px}.hero{padding:68px 0 42px;max-width:800px}.eyebrow{color:var(--accent);font-size:13px;letter-spacing:2px}h1{font-size:clamp(32px,5vw,54px);line-height:1.25;letter-spacing:-1px;margin:16px 0 22px}h2{font-size:23px;margin:36px 0 12px}h3{font-size:19px;margin:0 0 10px}p{margin:12px 0}.lead{font-size:19px;color:var(--muted);max-width:680px}.button{display:inline-block;padding:11px 22px;margin-top:20px;border-radius:12px;background:var(--accent);color:white;text-decoration:none}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin:24px 0 48px}.card{padding:26px;border:1px solid var(--line);border-radius:18px;background:#fff}.card p{color:var(--muted);margin:0}.number{color:var(--accent);font-size:13px;display:block;margin-bottom:14px}.article{max-width:800px;padding-top:32px;padding-bottom:56px}.article h1{font-size:38px}.article li{margin:8px 0}.note{padding:18px 22px;background:#eef1e7;border-radius:12px;border-left:3px solid #72917b}.minor,footer{font-size:13px;color:var(--muted)}footer{border-top:1px solid var(--line);padding-top:28px;padding-bottom:36px}footer p{margin:5px 0}code{font-size:13px;word-break:break-word}ul,ol{padding-left:25px}@media(max-width:680px){header,main,footer{padding-left:22px;padding-right:22px}header{align-items:flex-start;gap:20px}nav{gap:14px;padding-top:8px}.hero{padding:42px 0 24px}.grid{grid-template-columns:1fr;gap:12px}.card{padding:22px}.article h1{font-size:30px}}