:root{--ink:#14233c;--navy:#0b1931;--muted:#64738a;--silver:#e7ebef;--line:#dbe1e7;--paper:#f8fafb;--white:#fff;--violet:#7666d9;--amber:#d8b76b;--max:1230px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:'Noto Sans SC','Microsoft YaHei',Arial,sans-serif;line-height:1.75}img{max-width:100%;height:auto}a{color:inherit;text-decoration:none}button{font:inherit}p{margin:0 0 1.1em}h1,h2,h3,h4{line-height:1.24;letter-spacing:-.035em;margin:0}h1{font-size:clamp(2.75rem,5vw,5.65rem);font-weight:600}h2{font-size:clamp(2rem,3.1vw,3.3rem);font-weight:600}h3{font-size:1.3rem}h4{font-size:1.05rem}.shell{width:min(calc(100% - 72px),var(--max));margin-inline:auto}.skip-link{position:absolute;left:-9999px;top:8px;z-index:99;background:white;padding:8px}.skip-link:focus{left:8px}.site-header{border-bottom:1px solid 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@media(max-width:520px){.hero h1{font-size:2.48rem}.hero-intro p{margin-bottom:11px}.actions{display:flex;flex-direction:column;align-items:stretch}.hero-image{aspect-ratio:1.45}.hero-index{gap:5px 10px}.strip-links a{font-size:.73rem;padding:14px 7px}.slices{grid-template-columns:1fr}.slice{min-height:0;clip-path:none}.slice h3{margin-top:18px}.feature-copy h2{font-size:1.9rem}.process-grid{grid-template-columns:1fr 1fr;gap:0 8px}.process-grid>div{margin:0;padding-right:8px}.process-grid h3{font-size:1.04rem}.process-grid p{font-size:.75rem}.news-grid{grid-template-columns:1fr;gap:34px}.news-card h3{font-size:1.3rem}.news-card p{margin:10px 0}.faq-pair{grid-template-columns:1fr}.page-lead h1{font-size:2.38rem}.track-spec{grid-template-columns:1fr}.track-actions{align-items:flex-start;flex-direction:column}.guide-steps section{grid-template-columns:60px 1fr;gap:10px}.guide-steps b{font-size:1.8rem}.article-head h1{font-size:2.25rem}.article-prev-next{grid-template-columns:1fr}.article-prev-next a:last-child{text-align:left}.footer-links{grid-template-columns:1fr 1fr;gap:12px}.related-row{display:block}.related-row .text-link{display:block;margin:12px 0}.resource-grid{grid-template-columns:1fr 1fr}}