:root{color-scheme:light dark;--paper:#f6f4ed;--surface:#fffcf4;--ink:#24231d;--muted:#646157;--line:#d9d2c1;--accent:#f0d64f;--soft:#eee9dc;--link:#615012;--focus:#2f6595}
*{box-sizing:border-box}
html{scroll-padding-top:24px}
body{margin:0;background:var(--paper);color:var(--ink);font:400 17px/1.8 -apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;overflow-wrap:anywhere}
a{color:var(--link);text-underline-offset:4px;touch-action:manipulation}
a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid var(--focus);outline-offset:4px}
strong,b,h1,h2,h3{font-weight:600}
.shell{max-width:1040px;margin:auto;padding:0 32px}
.site-nav{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding:20px 0;border-bottom:1px solid var(--line);font-size:14px}
.site-nav a{color:inherit}
.site-nav [aria-current]{text-decoration:none;font-weight:600}
.site-nav .sep{color:var(--muted)}
.skip{position:absolute;left:16px;top:-100px;background:var(--accent);color:#24231d;padding:8px 16px;z-index:2}
.skip:focus{top:12px}
.hero{padding:64px 0 32px}
.eyebrow{font-size:13px;letter-spacing:.12em;color:var(--muted);margin:0 0 16px}
h1{font-size:clamp(32px,5vw,54px);line-height:1.3;margin:0 0 20px;text-wrap:balance}
h1 .highlight{box-shadow:inset 0 -.25em var(--accent)}
.lead{font-size:19px;max-width:38em;margin:0;color:var(--muted)}
.entries{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;margin:24px 0 72px}
.entry{display:flex;flex-direction:column;padding:28px;color:var(--ink);background:var(--surface);border-top:4px solid var(--ink);text-decoration:none;min-width:0}
.entry.gold{border-color:var(--accent);background:var(--soft)}
.entry .number{color:var(--muted);font-size:13px;margin-bottom:28px}
.entry h2{font-size:28px;line-height:1.4;margin:0 0 12px}
.entry h2 small{display:block;font-size:16px;font-weight:400;margin-top:4px;color:var(--muted)}
.entry p{margin:0 0 24px;color:var(--muted)}
.entry .go{margin-top:auto;font-size:15px}
@media(hover:hover){.entry:hover h2{text-decoration:underline;text-underline-offset:6px}.entry:hover{box-shadow:0 6px 20px #0000000c}}
.guide{max-width:780px;margin:auto;padding-bottom:48px}
.guide .hero{padding:40px 0 24px}
.guide h1{font-size:clamp(28px,4.5vw,42px)}
.guide h1 small{display:block;font-size:19px;color:var(--muted);margin-top:8px}
.back{display:inline-block;margin-top:24px;font-size:14px}
.toc{padding:16px 20px;background:var(--soft);margin:24px 0 32px}
.toc summary{cursor:pointer;font-weight:600}
.toc ol{padding-left:22px;margin-bottom:0}
.guide section{margin:40px 0}
.guide h2{font-size:26px;line-height:1.5;margin:0 0 18px;padding-top:16px;border-top:1px solid var(--line)}
.guide h3{font-size:20px;line-height:1.6;margin:28px 0 12px}
p{margin:12px 0 18px}
ul,ol{padding-left:24px}
li+li{margin-top:8px}
.note{padding:16px 20px;background:var(--soft);border-left:3px solid var(--accent);margin:20px 0}
.note p:first-child{margin-top:0}.note p:last-child{margin-bottom:0}
.checks{list-style:none;padding:0;margin:16px 0}
.checks li{border-bottom:1px solid var(--line);margin:0}
.checks label{display:flex;align-items:flex-start;gap:12px;padding:16px 0;cursor:pointer}
.checks input{flex:0 0 20px;width:20px;height:20px;margin:5px 0 0;accent-color:var(--link)}
.checks input:checked+span{color:var(--muted)}
.progress{display:flex;flex-wrap:wrap;justify-content:space-between;gap:4px 16px;padding:12px 0;border-bottom:1px solid var(--line);font-size:14px;color:var(--muted)}
.progress output{color:var(--ink);font-variant-numeric:tabular-nums}
.progress [data-storage-status]{flex-basis:100%}
code{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:.9em;overflow-wrap:anywhere}
pre{white-space:pre-wrap;overflow-wrap:anywhere;padding:20px;margin:12px 0;background:var(--soft);border:1px solid var(--line);font-size:15px;line-height:1.8}
.copy-row{display:flex;align-items:center;flex-wrap:wrap;gap:12px;font-size:14px}
button{font:inherit;color:var(--ink);background:var(--accent);border:0;border-radius:4px;padding:10px 18px;cursor:pointer;min-height:44px}
dl{margin:20px 0}dt{font-weight:600}dd{margin:4px 0 18px;color:var(--muted)}
table{width:100%;border-collapse:collapse;table-layout:fixed;font-size:15px;line-height:1.8;margin:20px 0}
caption{text-align:left;font-weight:600;margin-bottom:12px}
th,td{padding:14px 12px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line);overflow-wrap:anywhere}
thead{background:var(--soft)}th{font-weight:600}
.next{display:block;background:var(--accent);color:#24231d;text-decoration:none;padding:20px 24px;font-weight:600;margin-top:32px}
.colophon{padding:24px 0 32px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}
@media(prefers-color-scheme:dark){:root{--paper:#1e201e;--surface:#272a26;--ink:#e8e8dd;--muted:#bbbcb1;--line:#494b42;--accent:#665825;--soft:#2b2e29;--link:#f0d66b;--focus:#90bfe9}.next,button{background:#e8cd61;color:#24231d}.entry.gold{border-color:#d5b850}}
@media(max-width:600px){.shell{padding:0 16px}.hero{padding:40px 0 20px}.entries{grid-template-columns:1fr;gap:16px;margin-bottom:48px}.entry{padding:24px}.entry .number{margin-bottom:20px}.guide h2{font-size:23px}.lead{font-size:17px}.site-nav{font-size:14px;padding:16px 0}.note,.toc{padding:16px}pre{padding:16px}table,caption,tbody,tr,td,th{display:block;width:100%}thead{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}tr{border-top:2px solid var(--line);margin-bottom:20px}td,th{padding:10px 0}td::before{content:attr(data-label);display:block;font-size:13px;color:var(--muted);margin-bottom:4px}tbody th{font-size:17px;border-bottom:1px solid var(--line)}}

figure { margin: 1.5rem 0; }
figure img { display: block; width: 100%; height: auto; border-radius: 10px; }