:root{--paper:#f3f6fa;--ink:#18334c;--muted:#52677b;--blue:#245d96;--line:#cfdae5;--white:#fff}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.8 'Segoe UI','Microsoft YaHei',sans-serif}header,main,footer{max-width:920px;margin:auto;padding:26px 32px}header{display:flex;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line)}a{color:var(--blue);text-underline-offset:4px}a:focus-visible{outline:3px solid var(--blue);outline-offset:5px}.brand{font-weight:700;text-decoration:none}nav{display:flex;gap:20px}.eyebrow{font:13px/1.5 Consolas,monospace;letter-spacing:.1em;color:var(--muted);margin-top:38px}h1{font:600 clamp(32px,5vw,54px)/1.2 Georgia,'Microsoft YaHei',serif;max-width:760px;margin:20px 0}h2{font-size:22px;margin-top:34px}p{max-width:760px}.lead{font-size:20px}.en{color:var(--muted);font-size:15px}.flow{display:flex;align-items:center;gap:18px;padding:25px 0;border-block:1px solid var(--line);margin:36px 0}.flow span{flex:1}.flow small{display:block;color:var(--muted)}.note{padding:18px 24px;background:var(--white);border-left:4px solid var(--blue)}footer{font-size:13px;color:var(--muted);border-top:1px solid var(--line);margin-top:40px}li{margin:10px 0}@media(max-width:600px){header,main,footer{padding:20px}header{flex-direction:column}.flow{gap:10px;font-size:14px}.lead{font-size:18px}}