:root{--font-body:'Microsoft YaHei','PingFang SC',sans-serif;--font-display:'SimSun','Songti SC',serif;--ease-out:cubic-bezier(.16,1,.3,1)}*{box-sizing:border-box}html{scroll-behavior:smooth}html,body{margin:0;overflow-x:clip}body{font:16px/1.8 var(--font-body);background:var(--paper);color:var(--ink)}a{color:inherit;text-underline-offset:5px}button{font:inherit;color:inherit;cursor:pointer}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--focus);outline-offset:5px}button:active{opacity:.75}button:disabled{opacity:.5;cursor:not-allowed}header,main,footer{max-width:1400px;margin:auto;padding-inline:clamp(20px,4.5vw,64px)}header{display:flex;align-items:center;justify-content:space-between;gap:24px;padding-block:24px;border-bottom:1px solid var(--rule)}.brand{font:24px/1.4 var(--font-display);letter-spacing:1px;text-decoration:none}header nav{display:flex;align-items:center;gap:28px;flex-wrap:wrap}header nav a{font-size:14px;white-space:nowrap;text-decoration:none;padding-block:8px;color:var(--muted)}header nav a[aria-current]{color:var(--ink);text-decoration:underline}main{min-height:70vh;padding-block:48px 64px}h1,h2,h3,h4{overflow-wrap:anywhere;min-width:0;font-style:normal;line-height:1.4}h1{font:400 clamp(36px,4vw,60px)/1.35 var(--font-display);margin:20px 0}h2{font-size:25px}.page-intro{margin-bottom:40px}.page-intro p{max-width:65ch;color:var(--muted)}.page-intro>a{font-size:14px}.page-intro .credit{font-size:13px}footer{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;border-top:1px solid var(--rule);padding-block:24px;font-size:13px;color:var(--muted)}.skip{position:fixed;top:8px;left:16px;transform:translateY(-160%);background:var(--ink);color:var(--paper);padding:8px 16px;z-index:20}.skip:focus{transform:none}.preview-banner{background:#734600;color:#fff2d9;text-align:center;font-size:14px;padding:8px 16px}[hidden]{display:none!important}@media(max-width:650px){header{align-items:start;flex-direction:column;gap:12px}header nav{gap:24px}main{padding-block:32px 48px}h1{font-size:38px}.page-intro{margin-bottom:28px}footer{align-items:start}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}
