:root{color-scheme:light;--bg: #f6f1e7;--paper: #fcfaf5;--paper-2: #f1e9dc;--ink: #2a211a;--ink-2: #5b4e43;--ink-3: #6b5c4e;--kraft-light: #cfa475;--line: #e0d4c2;--line-2: #cdbca5;--kraft: #a67c52;--kraft-deep: #7a5634;--kraft-tint: #ecdcc4;--kraft-wash: #f4eadb;--green: #2f5d50;--green-tint: #e2ece6;--green-line: #b9cfc5;--rust: #8e3f22;--rust-tint: #f6e6dc;--night: #2b231c;--night-2: #3a3027;--on-night: #f3ebdf;--on-night-2: #cdbfae;--on-accent: #fffaf2;--focus: #2f5d50;--r-s: 8px;--r-m: 12px;--r-l: 18px;--sh-1: 0 1px 2px rgba(58, 40, 22, .06), 0 2px 6px rgba(58, 40, 22, .05);--sh-2: 0 1px 2px rgba(58, 40, 22, .06), 0 8px 24px rgba(58, 40, 22, .08);--ease: cubic-bezier(.2, .7, .2, 1);--font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Roboto, "Noto Sans SC", "Source Han Sans SC", "Helvetica Neue", Arial, sans-serif;--mono: ui-monospace, "SF Mono", Menlo, Consolas, "Roboto Mono", monospace;--shell: 1180px;--gutter: 24px}@media(prefers-color-scheme:dark){:root{color-scheme:dark;--bg: #1b1713;--paper: #241f19;--paper-2: #2c261f;--ink: #f0e8dc;--ink-2: #cfc2b1;--ink-3: #ab9d8b;--line: #3a3229;--line-2: #4d4236;--kraft: #c69c6d;--kraft-deep: #ddb88c;--kraft-tint: #3b3024;--kraft-wash: #2a231b;--green: #86bfae;--green-tint: #1d2d28;--green-line: #2f4a41;--rust: #e5a07f;--rust-tint: #34231b;--night: #120f0c;--night-2: #231d17;--on-accent: #1b1713;--focus: #86bfae;--sh-1: 0 1px 2px rgba(0, 0, 0, .3);--sh-2: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .3)}}*,*:before,*:after{box-sizing:border-box}html{background-color:var(--bg);color:var(--ink);scroll-padding-top:88px;-webkit-text-size-adjust:100%}body{margin:0;background-color:var(--bg);color:var(--ink);font-family:var(--font);font-size:16px;line-height:1.75}img,svg{max-width:100%}a{color:var(--green);text-decoration-thickness:1px;text-underline-offset:3px}a:hover{color:var(--kraft-deep)}:focus-visible{outline:2px solid var(--focus);outline-offset:2px;border-radius:4px}::selection{background:var(--kraft-tint);color:var(--ink)}h1,h2,h3,h4{line-height:1.3;font-weight:600;letter-spacing:-.015em;margin:0}p{margin:0 0 .9em}.num{font-variant-numeric:tabular-nums}.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}.shell{max-width:var(--shell);margin:0 auto;padding:0 var(--gutter)}.muted{color:var(--ink-3)}.skip{position:absolute;left:-999px;top:8px;background:var(--paper);padding:8px 14px;border-radius:var(--r-s);z-index:20}.skip:focus{left:12px}.mast{position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:saturate(1.2) blur(10px);-webkit-backdrop-filter:saturate(1.2) blur(10px);border-bottom:1px solid var(--line)}.mast .shell{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:64px}.wordmark{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);min-width:0}.wordmark img{flex:none;border-radius:9px}.wordmark b{display:block;font-size:16px;font-weight:600;letter-spacing:-.01em;line-height:1.25}.wordmark small{display:block;font-size:11px;color:var(--ink-3);letter-spacing:.12em;line-height:1.3}.nav{display:flex;gap:4px;flex-wrap:wrap;justify-content:flex-end}.nav a{color:var(--ink-2);text-decoration:none;font-size:14.5px;padding:6px 12px;border-radius:999px;transition:background .2s var(--ease),color .2s var(--ease)}.nav a:hover{background:var(--kraft-wash);color:var(--ink)}.nav a[aria-current=page]{color:var(--ink);background:var(--kraft-tint)}.eyebrow{font-size:12.5px;letter-spacing:.16em;color:var(--kraft-deep);margin:0 0 12px;display:flex;align-items:center;gap:10px}.eyebrow:before{content:"";width:22px;height:1px;background:var(--kraft)}.lead{font-size:17.5px;color:var(--ink-2);max-width:40em}.btn{display:inline-flex;align-items:center;gap:6px;font:inherit;font-size:15px;padding:9px 18px;border-radius:999px;border:1px solid var(--line-2);background:var(--paper);color:var(--ink);text-decoration:none;cursor:pointer;transition:transform .2s var(--ease),box-shadow .2s var(--ease),border-color .2s var(--ease)}.btn:hover{transform:translateY(-1px);box-shadow:var(--sh-1);border-color:var(--kraft);color:var(--ink)}.btn.solid{background:var(--green);border-color:var(--green);color:var(--on-accent)}.btn.solid:hover{color:var(--on-accent);border-color:var(--green)}.panel{background:var(--paper);border:1px solid var(--line);border-radius:var(--r-l);padding:22px 24px;box-shadow:var(--sh-1)}.panel h3{font-size:17px;margin-bottom:10px}.panel ul{margin:0;padding-left:1.2em}.panel li{margin:.35em 0}.band{padding:72px 0}.band.alt{background:var(--paper-2)}.band-h{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:28px;flex-wrap:wrap}.band-h h2{font-size:clamp(24px,3vw,30px)}.band-h .lead{margin:0}.two{display:grid;grid-template-columns:1fr 1fr;gap:20px}blockquote{margin:1.2em 0;padding:14px 18px;background:var(--kraft-wash);border-left:2px solid var(--kraft);border-radius:0 var(--r-m) var(--r-m) 0;color:var(--ink);overflow-wrap:anywhere}blockquote cite{display:block;margin-top:8px;font-style:normal;font-size:13.5px;color:var(--ink-3)}.clasp{position:relative;display:inline-block;width:46px;height:22px;flex:none}.clasp i{position:absolute;top:3px;width:16px;height:16px;border:1.5px solid var(--kraft);border-radius:50%;background:var(--paper)}.clasp i:first-child{left:0}.clasp i:last-child{right:0}.clasp:before{content:"";position:absolute;left:8px;right:8px;top:10px;border-top:1px solid var(--kraft);transform:rotate(-8deg)}.intro{padding:56px 0 36px}.intro-grid{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,.75fr);gap:48px;align-items:center}.intro h1{font-size:clamp(30px,4.2vw,46px);letter-spacing:-.025em;margin-bottom:18px}.intro h1 em{font-style:normal;color:var(--kraft-deep)}.intro-facts{display:flex;gap:28px;margin:26px 0 0;flex-wrap:wrap}.intro-facts div{border-top:1px solid var(--line-2);padding-top:10px;min-width:110px}.intro-facts dt{font-size:13px;color:var(--ink-3)}.intro-facts dd{margin:0;font-size:28px;font-weight:600;letter-spacing:-.02em}.intro-facts small{font-size:14px;font-weight:400;color:var(--ink-3);margin-left:2px}.intro-art{justify-self:end;width:100%;max-width:380px}.intro-art svg{display:block;width:100%;height:auto;filter:drop-shadow(0 18px 30px rgba(90,60,30,.14))}.tool{display:grid;grid-template-columns:360px minmax(0,1fr);gap:28px;align-items:start;padding-bottom:72px}.slip{position:sticky;top:84px;background:var(--paper);border:1px solid var(--line);border-radius:var(--r-l);box-shadow:var(--sh-2);overflow:hidden}.slip-h{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px 20px;background:var(--kraft-tint);border-bottom:1px dashed var(--line-2)}.slip-h h2{font-size:16px}.slip-h span{font-family:var(--mono);font-size:11.5px;color:var(--kraft-deep);letter-spacing:.08em}.slip form{padding:6px 20px 4px}.field{border:0;margin:0;padding:14px 0;border-bottom:1px solid var(--line);min-width:0}.field:last-child{border-bottom:0}.field legend{font-size:14.5px;font-weight:600;padding:0;margin-bottom:8px;display:flex;gap:8px;align-items:baseline}.field legend .num{font-family:var(--mono);font-size:11.5px;color:var(--kraft-deep);font-weight:500}.opts{display:flex;flex-wrap:wrap;gap:6px}.opt{position:relative}.opt input{position:absolute;opacity:0;inset:0;margin:0;cursor:pointer}.opt span{display:inline-block;font-size:13.5px;line-height:1.4;padding:6px 11px;border:1px solid var(--line-2);border-radius:999px;background:var(--paper);color:var(--ink-2);transition:all .18s var(--ease)}.opt input:hover+span{border-color:var(--kraft);color:var(--ink)}.opt input:checked+span{background:var(--ink);border-color:var(--ink);color:var(--paper)}.opt input[type=checkbox]:checked+span:before{content:"✓ "}.opt input:focus-visible+span{outline:2px solid var(--focus);outline-offset:2px}.hint{font-size:12.5px;color:var(--ink-3);margin:8px 0 0;line-height:1.6}.field.is-off{opacity:.45}.slip-foot{padding:14px 20px 18px;background:var(--kraft-wash);border-top:1px solid var(--line);font-size:13px;color:var(--ink-2)}.slip-foot p{margin:0 0 10px}.slip-foot .row{display:flex;gap:8px;flex-wrap:wrap}.slip-foot .btn{font-size:13.5px;padding:7px 14px}#form-status{min-height:1em;margin:8px 0 0;color:var(--rust)}.sum{background:var(--paper);border:1px solid var(--line);border-radius:var(--r-l);padding:18px 22px;box-shadow:var(--sh-1);margin-bottom:18px}.sum-line{display:flex;flex-wrap:wrap;gap:6px;margin:0 0 12px}.sum-line span{font-size:13px;padding:3px 10px;border-radius:999px;background:var(--paper-2);color:var(--ink-2)}.sum-line .lead-tag{background:var(--kraft-tint);color:var(--ink);font-weight:600}.sum-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:0}.sum-stats div{border-left:1px solid var(--line-2);padding-left:12px}.sum-stats dt{font-size:12.5px;color:var(--ink-3)}.sum-stats dd{margin:0;font-size:26px;font-weight:600;line-height:1.2}.plan-notes{margin-bottom:18px}.plan-notes p{margin:0 0 8px;padding:10px 14px;border-radius:var(--r-m);background:var(--green-tint);color:var(--ink);font-size:14.5px;border:1px solid var(--green-line)}.env{background:var(--paper);border:1px solid var(--line);border-radius:var(--r-l);box-shadow:var(--sh-2);margin-bottom:22px;overflow:hidden}.env-h{display:flex;align-items:center;gap:14px;padding:16px 22px;background:linear-gradient(180deg,var(--kraft-tint),var(--kraft-wash));border-bottom:1px solid var(--line-2);position:relative}.env-h:after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;background:repeating-linear-gradient(90deg,var(--kraft) 0 6px,transparent 6px 11px);opacity:.5}.env-no{font-family:var(--mono);font-size:12px;color:var(--kraft-deep);border:1px solid var(--kraft);border-radius:6px;padding:1px 6px;flex:none}.env-h>div{flex:1;min-width:0}.env-h h3{font-size:19px}.env-h p{margin:2px 0 0;font-size:14px;color:var(--ink-2)}.env-body{padding:18px 22px 20px}.notice{padding:14px 16px;border-radius:var(--r-m);background:var(--kraft-wash);border:1px solid var(--line);margin-bottom:14px}.notice p{margin:0 0 6px}.steps{list-style:none;margin:0;padding:0;position:relative}.steps:before{content:"";position:absolute;left:17px;top:10px;bottom:10px;border-left:1px dashed var(--line-2)}.step{display:grid;grid-template-columns:36px minmax(0,1fr);gap:14px;padding:6px 0 14px;position:relative}.step-no{width:36px;height:36px;border-radius:50%;border:1.5px solid var(--kraft);background:var(--paper);display:grid;place-items:center;font-family:var(--mono);font-size:12.5px;color:var(--kraft-deep);position:relative;z-index:1}.step-card h4{font-size:16.5px;margin:6px 0}.who{display:flex;flex-wrap:wrap;gap:6px;margin:0 0 8px}.actor{font-size:12.5px;padding:2px 9px;border-radius:6px;background:var(--paper-2);color:var(--ink-2);border:1px solid var(--line)}.actor.a-me{background:transparent}.actor.a-school,.actor.a-degreeUnit,.actor.a-zikaoOrg{background:var(--kraft-tint);color:var(--ink);border-color:transparent}.actor.a-archiveOrg,.actor.a-employer{background:var(--ink);color:var(--paper);border-color:var(--ink)}.what{color:var(--ink);margin-bottom:8px}.facts{margin:0 0 8px;display:grid;gap:6px}.fact{display:grid;grid-template-columns:72px minmax(0,1fr);gap:10px;font-size:14px}.fact dt{color:var(--ink-3)}.fact dd{margin:0;color:var(--ink-2)}.mats{margin:0;padding-left:1.1em}.mats li{margin:0 0 2px}.out{color:var(--green)!important;font-weight:600}.warn{font-size:14px;padding:8px 12px;border-radius:var(--r-s);background:var(--rust-tint);color:var(--ink);border-left:2px solid var(--rust)}.own,.basis{font-size:13px;color:var(--ink-3);margin:0 0 4px;overflow-wrap:anywhere}.own-tag,.own-inline{display:inline-block;font-size:11.5px;padding:0 7px;border-radius:4px;border:1px dashed var(--kraft);color:var(--kraft-deep);margin-right:6px;line-height:1.7}.basis-h{color:var(--ink-2);margin-right:6px}.sep{margin:0 6px;color:var(--ink-3);opacity:.7}.subs{margin-top:6px;padding:14px 16px;border-radius:var(--r-m);background:var(--green-tint);border:1px solid var(--green-line)}.subs-h{font-size:13px;letter-spacing:.12em;color:var(--green);margin:0 0 8px;font-weight:600}.subs ul{list-style:none;margin:0;padding:0;display:grid;gap:10px}.sub{padding-left:12px;border-left:2px solid var(--green)}.sub.k-verify{border-left-style:dashed}.sub p{margin:0 0 4px;font-size:14px}.sub-name{display:flex;gap:8px;align-items:baseline;flex-wrap:wrap}.sub-name b{font-size:15px;color:var(--ink)}.sub-kind{font-size:12px;color:var(--green)}.band.night{background:var(--night);color:var(--on-night)}.band.night h2,.band.night h3{color:var(--on-night)}.band.night .eyebrow{color:var(--kraft-light)}.band.night .eyebrow:before{background:var(--kraft-light)}.band.night .lead{color:var(--on-night-2)}.band.night blockquote{background:var(--night-2);color:var(--on-night);border-left-color:var(--kraft)}.band.night blockquote cite,.band.night blockquote cite a{color:var(--on-night-2)}.refuse{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.refuse article{background:var(--night-2);border:1px solid rgba(255,255,255,.08);border-radius:var(--r-l);padding:20px 22px}.refuse h3{font-size:17px;margin-bottom:8px}.refuse p{color:var(--on-night-2);font-size:14.5px}.refuse blockquote{margin:10px 0 0;font-size:14px;background:#0000002e}.keys{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.key{background:var(--paper);border:1px solid var(--line);border-radius:var(--r-l);padding:20px 22px;box-shadow:var(--sh-1)}.key .tag{display:inline-block;font-size:12px;color:var(--green);background:var(--green-tint);border-radius:999px;padding:2px 10px;margin-bottom:10px}.key h3{font-size:18px;margin-bottom:8px}.key blockquote{font-size:14px;margin:10px 0 0}.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.acard{display:block;text-decoration:none;color:var(--ink);background:var(--paper);border:1px solid var(--line);border-radius:var(--r-l);padding:22px 24px;box-shadow:var(--sh-1);transition:transform .25s var(--ease),box-shadow .25s var(--ease);position:relative;overflow:hidden}.acard:before{content:"";position:absolute;left:0;right:0;top:0;height:6px;background:var(--kraft-tint)}.acard:hover{transform:translateY(-3px);box-shadow:var(--sh-2);color:var(--ink)}.acard .kicker{font-size:12.5px;color:var(--kraft-deep);letter-spacing:.1em}.acard h3{font-size:19px;margin:8px 0}.acard p{color:var(--ink-2);font-size:14.5px}.acard .more{font-size:14px;color:var(--green)}.faq details{background:var(--paper);border:1px solid var(--line);border-radius:var(--r-m);padding:14px 18px;margin-bottom:10px}.faq summary{cursor:pointer;font-weight:600;list-style:none;display:flex;justify-content:space-between;gap:12px}.faq summary::-webkit-details-marker{display:none}.faq summary:after{content:"+";color:var(--kraft-deep);font-weight:400}.faq details[open] summary:after{content:"−"}.faq details p{margin:10px 0 0;color:var(--ink-2)}.page{padding:40px 0 56px}.page-hero{padding:44px 0 30px;border-bottom:1px solid var(--line);background:linear-gradient(180deg,var(--kraft-wash),transparent)}.page-hero h1{font-size:clamp(28px,3.6vw,40px);letter-spacing:-.02em;margin-bottom:12px}.crumbs{font-size:13.5px;color:var(--ink-3);margin-bottom:14px}.crumbs a{color:var(--ink-3)}.meta{font-size:13.5px;color:var(--ink-3)}.article-grid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:44px;align-items:start;padding-top:32px}.prose{max-width:720px;font-size:16.5px;min-width:0}.prose h2{font-size:22px;margin:1.8em 0 .6em;padding-top:.2em}.prose h2:first-child{margin-top:0}.prose ol,.prose ul{padding-left:1.3em}.prose li{margin:.35em 0}.prose .refs{font-size:14px;color:var(--ink-2)}.prose .answer{padding:18px 20px;border-radius:var(--r-l);background:var(--paper);border:1px solid var(--line);box-shadow:var(--sh-1);margin-bottom:1.4em}.prose .answer p:last-child{margin:0}.tablewrap{overflow-x:auto;margin:1.2em 0;border:1px solid var(--line);border-radius:var(--r-m);background:var(--paper)}table{border-collapse:collapse;width:100%;font-size:14.5px}th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}th{background:var(--paper-2);font-weight:600;white-space:nowrap}tr:last-child td{border-bottom:0}td.eq{color:var(--green);font-weight:600}.aside{position:sticky;top:84px;display:grid;gap:16px}.aside .panel h2{font-size:16px;margin-bottom:8px}.aside .panel p,.aside .panel li{font-size:14px;color:var(--ink-2)}.aside .panel ol{margin:0;padding-left:1.2em}.rules-toc{display:flex;flex-wrap:wrap;gap:8px;margin:22px 0 0;padding:0;list-style:none}.rules-toc a{display:inline-block;font-size:13.5px;padding:5px 12px;border-radius:999px;background:var(--paper);border:1px solid var(--line);text-decoration:none;color:var(--ink-2)}.rule-group{margin-top:40px}.rule-group>h2{font-size:22px;margin-bottom:14px;display:flex;align-items:center;gap:12px}.rule-group>h2 .clasp{transform:scale(.85)}.rule{background:var(--paper);border:1px solid var(--line);border-radius:var(--r-l);padding:20px 22px;margin-bottom:14px;box-shadow:var(--sh-1)}.rule:target{border-color:var(--green);box-shadow:0 0 0 3px var(--green-tint)}.rule-h{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;align-items:baseline}.rule-h h3{font-size:17px}.rule-h .clause{font-family:var(--mono);font-size:12.5px;color:var(--kraft-deep)}.rule .doc{font-size:13.5px;color:var(--ink-3);margin:4px 0 0}.rule .used{font-size:14.5px;color:var(--ink-2);margin:0 0 6px}.rule .status{font-size:13.5px;color:var(--ink-2);padding:6px 10px;background:var(--paper-2);border-radius:var(--r-s)}.rule .src{font-size:13px;color:var(--ink-3);overflow-wrap:anywhere;margin:0}.rule.own{border-style:dashed;background:var(--kraft-wash);box-shadow:none}.support{margin:8px auto 56px;display:flex;gap:20px;align-items:center;justify-content:space-between;padding:20px 24px;border-radius:var(--r-l);background:var(--paper);border:1px solid var(--line);box-shadow:var(--sh-1)}.support p{margin:0;font-size:14px;color:var(--ink-2);max-width:46em}.support .btn{flex:none}.footer{border-top:1px solid var(--line);padding:26px 0 36px;font-size:13.5px;color:var(--ink-3)}.footer .shell{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}.footer nav{display:flex;gap:16px;flex-wrap:wrap}.footer a{color:var(--ink-2);text-decoration:none}.footer a:hover{color:var(--green)}.notfound{padding:88px 0 72px;text-align:center}.notfound .clasp{transform:scale(1.4);margin-bottom:26px}.notfound h1{font-size:clamp(28px,4vw,40px);margin-bottom:12px}.notfound .row{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:22px}@media(prefers-reduced-motion:reduce){*,*:before,*:after{transition:none!important}}@media(max-width:1024px){.tool{grid-template-columns:1fr}.slip{position:static}.article-grid{grid-template-columns:1fr}.aside{position:static}.refuse,.keys{grid-template-columns:1fr}}@media(max-width:760px){:root{--gutter: 16px}.mast .shell{flex-direction:column;align-items:stretch;gap:6px;padding-top:10px;padding-bottom:8px}.nav{justify-content:flex-start;margin-left:-8px}.nav a{padding:4px 8px;font-size:14px}.mast{position:static}html{scroll-padding-top:12px}.slip,.aside{top:0}.intro{padding:34px 0 22px}.intro-grid{grid-template-columns:1fr;gap:20px}.intro-art{display:none}.intro-facts{gap:16px}.intro-facts div{min-width:0;flex:1}.intro-facts dd{font-size:22px}.two,.cards{grid-template-columns:1fr}.band{padding:52px 0}.env-h,.env-body{padding-left:16px;padding-right:16px}.fact{grid-template-columns:1fr;gap:0}.step{grid-template-columns:30px minmax(0,1fr);gap:10px}.step-no{width:30px;height:30px;font-size:11.5px}.steps:before{left:14px}.sum-stats dd{font-size:22px}.support{flex-direction:column;align-items:flex-start}}