:root{--ink:#172222;--muted:#596564;--paper:#f3f5f2;--white:#fff;--rail:#132020;--red:#ae332e;--line:#d8dfd9;--wash:#e8eeea}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.8 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}a{color:inherit;text-decoration-thickness:1px;text-underline-offset:4px}button{font:inherit;cursor:pointer}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #dd9f54;outline-offset:5px}img{display:block;max-width:100%;height:auto}p{margin:0 0 1.1em}h1,h2,h3{line-height:1.25;margin:0 0 .65em;letter-spacing:-.035em}h1{font-size:clamp(32px,3.6vw,50px)}h2{font-size:clamp(24px,2.4vw,32px)}h3{font-size:21px}code{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;overflow-wrap:anywhere}figure{margin:0}.skip-link{position:absolute;left:16px;top:-90px;z-index:9;padding:10px;background:#fff}.skip-link:focus{top:10px}.brand-rail{width:208px;position:fixed;inset:0 auto 0 0;background:var(--rail);color:#f2f4ee;padding:40px 26px;display:flex;flex-direction:column;z-index:3}.rail-brand{font-size:25px;line-height:1.2;font-weight:750;text-decoration:none;letter-spacing:-.04em}.rail-brand small{display:block;font-size:12px;font-weight:400;margin-top:11px;letter-spacing:.12em;color:#b7c7c0}.rail-menu{display:grid;gap:4px;margin-top:60px}.rail-menu a,.rail-menu span{padding:11px 0;text-decoration:none;border-bottom:1px solid #31433d;font-size:14px}.rail-menu a:hover{color:#ffd8aa}.rail-menu [aria-current]{color:#ffd8aa}.rail-bottom{margin-top:auto;padding-top:40px;font-size:12px;color:#b7c7c0}.rail-bottom p{margin:0}.mobile-menu{display:none}.portal-main,.portal-footer{margin-left:208px}.portal-main{padding:58px clamp(24px,4vw,76px) 72px;max-width:1580px}.eyebrow{font-size:12px;color:var(--red);font-weight:700;letter-spacing:.08em;margin-bottom:17px}.lead{font-size:19px;line-height:1.6;color:var(--muted)}.portal-opening{display:grid;grid-template-columns:minmax(0,1fr) minmax(300px,.9fr);gap:36px;align-items:center}.opening-copy h1 span{display:block;font-family:ui-sans-serif,system-ui,sans-serif;letter-spacing:-.06em;font-size:1.1em;margin-bottom:8px}.opening-copy>p:not(.eyebrow){max-width:39em}.main-action{display:inline-block;background:var(--red);color:#fff;text-decoration:none;font-weight:650;padding:12px 20px;border-radius:3px;margin:8px 0 20px}.main-action:hover{background:#8d2724}.domain-line{display:flex;gap:10px;align-items:center;flex-wrap:wrap;font-size:13px}.domain-line code{font-size:17px}.domain-line button{border:1px solid var(--line);background:#fff;color:var(--ink);padding:5px 10px;border-radius:3px}.copy-result{font-size:12px;color:var(--muted)}.opening-photo img{width:100%;height:350px;object-fit:cover;object-position:52% 40%;border-radius:3px}.opening-photo figcaption{font-size:11px;line-height:1.5;color:var(--muted);margin-top:10px}.problem-desk{display:grid;grid-template-columns:240px 1fr;gap:36px;margin-top:64px;background:var(--white);border:1px solid var(--line);padding:32px}.desk-title p:last-child{font-size:14px;color:var(--muted)}.problem-rows a{display:grid;grid-template-columns:1fr auto;column-gap:14px;padding:14px 0;border-bottom:1px solid var(--line);text-decoration:none}.problem-rows a:first-child{padding-top:0}.problem-rows a:last-child{border:0;padding-bottom:0}.problem-rows strong{font-size:17px}.problem-rows span{grid-column:1;font-size:13px;color:var(--muted)}.problem-rows em{font-size:12px;font-style:normal;grid-column:2;grid-row:1/3;align-self:center;color:var(--red)}.field-note{display:grid;grid-template-columns:1fr 1.45fr;gap:50px;padding:48px 0;border-bottom:1px solid var(--line);margin-top:18px}.field-note h2{font-size:30px}.text-link{font-weight:650;color:var(--red)}.portal-reading{margin-top:48px}.section-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:20px}.section-heading h2{margin:0}.section-heading>a{font-size:13px;flex-shrink:0}.guide-list{display:grid;border-top:1px solid var(--line)}.guide-item{display:grid;grid-template-columns:100px 1fr;gap:30px;padding:23px 0;border-bottom:1px solid var(--line);text-decoration:none}.guide-item .guide-kind{font-size:12px;color:var(--red)}.guide-item h3{font-size:20px;margin-bottom:6px}.guide-item p{font-size:14px;color:var(--muted);margin:0}.short-answer{margin-top:46px}.short-answer details{border-bottom:1px solid var(--line);padding:15px 0}.short-answer summary{cursor:pointer;font-weight:600}.short-answer details p{font-size:14px;max-width:62em;margin:14px 0 0}.portal-footer{padding:30px clamp(24px,4vw,76px) 36px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}.footer-top{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:14px}.footer-top p{margin:0;font-size:16px;font-weight:650;color:var(--ink)}.footer-top nav{display:flex;gap:18px;flex-wrap:wrap}.portal-footer>p{margin:0;max-width:65em}.page-head{max-width:860px;padding:0 0 32px;border-bottom:1px solid var(--line);margin-bottom:32px}.page-head h1{font-size:clamp(30px,3.2vw,44px)}.page-head>p:last-child{margin-bottom:0}.instruction-sheet{max-width:860px}.instruction-sheet section{margin:0 0 38px}.instruction-sheet h2{font-size:26px}.check-fields{margin:22px 0}.check-fields>div{display:grid;grid-template-columns:110px 1fr;gap:20px;padding:17px 0;border-top:1px solid var(--line)}.check-fields dt{font-weight:650;color:var(--red)}.check-fields dd{margin:0}.useful-aside{border-left:4px solid var(--red);padding:24px 28px;background:var(--wash);margin:30px 0}.useful-aside h2{font-size:23px}.useful-aside p:last-child{margin-bottom:0}.jump-menu{display:flex;gap:10px;flex-wrap:wrap;margin:0 0 25px}.jump-menu a{background:#fff;border:1px solid var(--line);padding:6px 13px;font-size:13px;text-decoration:none}.result-section{display:grid;grid-template-columns:150px 1fr;gap:32px;padding:32px 0;border-bottom:1px solid var(--line);scroll-margin-top:25px}.result-code{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:16px;color:var(--red);font-weight:650}.result-section h2{font-size:27px}.result-section p{max-width:55em}.case-page{max-width:1220px}.case-article{max-width:880px}.case-copy{max-width:720px;margin-left:100px;font-size:17px}.case-copy>p:first-child{font-size:19px;border-left:4px solid var(--red);padding-left:20px;margin-bottom:32px}.case-copy section{margin-bottom:42px}.case-copy h2{font-size:27px}.case-copy .check-fields>div{grid-template-columns:95px 1fr}.article-date{font-size:12px;color:var(--muted)}.record-example{background:var(--white);padding:24px;border:1px solid var(--line);font-size:14px}.record-example p{margin:0;padding:8px 0;border-bottom:1px solid var(--line)}.record-example p:last-child{border:0}.legacy-note .eyebrow{color:var(--muted)}.legacy-note h1{font-size:34px}.article-index .guide-item{grid-template-columns:130px 1fr;padding:28px 0}.article-index{max-width:900px}@media(min-width:1700px){.portal-main{margin-right:auto}}@media(max-width:1150px){.brand-rail{width:180px;padding:30px 20px}.portal-main,.portal-footer{margin-left:180px}.portal-main{padding-left:30px;padding-right:30px}.portal-opening{grid-template-columns:1fr;gap:22px}.opening-photo img{height:300px}.problem-desk{grid-template-columns:1fr;gap:15px}.desk-title h2{margin-bottom:10px}.field-note{gap:28px}.case-copy{margin-left:35px}}@media(max-width:700px){html{scroll-padding-top:20px}.brand-rail{position:relative;width:100%;padding:19px 22px;display:flex;flex-direction:row;align-items:center;justify-content:space-between}.rail-brand{font-size:21px}.rail-brand small{font-size:10px;margin-top:5px;letter-spacing:.05em}.rail-menu,.rail-bottom{display:none}.mobile-menu{display:block;font-size:13px}.mobile-menu summary{cursor:pointer;padding:9px}.mobile-menu nav{position:absolute;left:0;right:0;top:78px;background:var(--rail);padding:12px 22px;display:grid;z-index:4;border-top:1px solid #31433d}.mobile-menu a,.mobile-menu span{padding:8px;text-decoration:none}.portal-main,.portal-footer{margin-left:0}.portal-main{padding:30px 22px 46px}.portal-opening{gap:22px}.opening-copy h1{font-size:34px}.opening-copy h1 span{font-size:39px}.eyebrow{margin-bottom:12px;font-size:11px}.lead{font-size:17px}.opening-copy>p:not(.lead):not(.eyebrow){font-size:14px}.main-action{font-size:14px;padding:11px 16px;margin:3px 0 15px}.domain-line{gap:8px}.domain-line code{font-size:15px}.opening-photo img{height:200px;object-position:50% 36%}.opening-photo figcaption{font-size:10px}.problem-desk{margin-top:32px;padding:21px 18px;gap:14px}.desk-title h2{font-size:26px}.desk-title p:last-child{margin-bottom:0}.problem-rows a{grid-template-columns:1fr;padding:17px 0}.problem-rows strong{font-size:16px}.problem-rows span{font-size:13px}.problem-rows em{grid-column:1;grid-row:auto;padding-top:6px;font-size:12px}.field-note{grid-template-columns:1fr;gap:8px;padding:32px 0}.field-note h2{font-size:28px}.field-note p:not(.eyebrow){font-size:14px}.portal-reading{margin-top:30px}.section-heading{display:block}.section-heading h2{font-size:26px;margin-bottom:10px}.guide-item,.article-index .guide-item{grid-template-columns:1fr;gap:7px;padding:22px 0}.guide-item h3{font-size:19px;line-height:1.5}.guide-item p{font-size:13px}.short-answer{margin-top:30px}.short-answer h2{font-size:25px}.short-answer summary{font-size:14px}.portal-footer{padding:26px 22px}.footer-top{display:block}.footer-top p{margin-bottom:10px}.footer-top nav{gap:15px}.page-head{padding-bottom:24px;margin-bottom:25px}.page-head h1{font-size:30px;line-height:1.4}.page-head .lead{font-size:17px}.page-head>p:not(.lead):not(.eyebrow){font-size:13px}.instruction-sheet{font-size:15px}.instruction-sheet h2{font-size:24px}.check-fields>div,.case-copy .check-fields>div{grid-template-columns:1fr;gap:4px;padding:16px 0}.useful-aside{padding:20px}.useful-aside h2{font-size:22px}.result-section{grid-template-columns:1fr;gap:12px;padding:27px 0}.result-section h2{font-size:25px}.result-section p{font-size:15px}.result-code{font-size:14px}.case-copy{margin-left:0;font-size:16px;line-height:1.9}.case-copy>p:first-child{font-size:17px;padding-left:16px}.case-copy h2{font-size:25px}.case-copy section{margin-bottom:32px}.record-example{padding:17px;font-size:13px}.legacy-note h1{font-size:29px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
