:root{color-scheme:light;--ink:#182e35;--muted:#53676d;--line:#dce5e4;--accent:#146a61;--paper:#f6f8f5}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.85 system-ui,"Microsoft YaHei",sans-serif}a{color:var(--accent);text-underline-offset:4px}a:focus-visible{outline:3px solid #c28c37;outline-offset:5px}header,main,footer{width:min(860px,calc(100% - 40px));margin:auto}header{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:24px 0;border-bottom:1px solid var(--line)}.brand{font-size:23px;font-weight:750;color:var(--ink);text-decoration:none}nav{display:flex;gap:22px;flex-wrap:wrap;font-size:14px}main{padding:64px 0 48px}.eyebrow{font-size:12px;letter-spacing:.15em;color:var(--accent);font-weight:700}h1{font-size:clamp(31px,6vw,46px);line-height:1.3;margin:12px 0 20px;letter-spacing:-.03em}h2{font-size:23px;line-height:1.5;margin:38px 0 12px}p{margin:12px 0}ul,ol{padding-left:24px}.intro{font-size:20px;max-width:740px}.note{color:var(--muted);font-size:14px}.flow{margin:34px 0;padding:24px 28px;border-left:3px solid var(--accent);background:#eaf0eb}.flow span{display:inline-block;margin-right:10px}section+section{border-top:1px solid var(--line);margin-top:34px;padding-top:2px}footer{border-top:1px solid var(--line);padding:22px 0 40px;color:var(--muted);font-size:13px}.links{display:flex;gap:24px;flex-wrap:wrap}.tag{display:inline-block;border:1px solid var(--line);border-radius:30px;padding:3px 12px;font-size:12px;margin-top:10px}@media(max-width:560px){header{align-items:flex-start;flex-direction:column;gap:8px;padding:18px 0}nav{gap:18px}main{padding-top:36px}.intro{font-size:18px}.flow{padding:18px}h2{font-size:21px}}