:root{
  --brand:#6D28D9;--brand-soft:#A78BFA;--ink:#27242D;--muted:#716B78;--dark:#17151C;--bg:#F7F5FA;--soft:#ECE8F2;--accent:#F59E0B;--white:#fff;--line:#DDD6E5;--shadow:0 18px 50px rgba(34,25,45,.10);--radius:22px;--radius-sm:14px;--max:1180px;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:system-ui,-apple-system,"Segoe UI","Microsoft YaHei",Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.72;-webkit-font-smoothing:antialiased}body.modal-open{overflow:hidden}img{display:block;max-width:100%;height:auto}a{color:inherit;text-decoration:none}button,input,textarea{font:inherit}.shell{width:min(var(--max),calc(100% - 48px));margin-inline:auto}.skip-link{position:fixed;left:16px;top:-80px;background:var(--white);padding:10px 14px;z-index:200;border-radius:8px;box-shadow:var(--shadow)}.skip-link:focus{top:12px}.site-header{position:sticky;top:0;z-index:100;background:rgba(247,245,250,.94);backdrop-filter:blur(16px);border-bottom:1px solid rgba(109,40,217,.08)}.header-inner{width:min(1240px,calc(100% - 40px));margin:auto;min-height:76px;display:flex;align-items:center;gap:28px}.brand{display:flex;align-items:center;gap:10px;min-width:max-content}.brand img{width:42px;height:42px;object-fit:contain;border-radius:10px}.brand-text{display:grid;line-height:1.15}.brand-text strong{font-size:24px;color:var(--brand)}.brand-text small{font-size:11px;color:var(--muted);margin-top:4px}.primary-nav{margin-left:auto;display:flex;align-items:center;gap:5px}.primary-nav a{padding:10px 12px;border-radius:10px;font-size:15px}.primary-nav a:hover,.primary-nav a:focus-visible{background:var(--soft);color:var(--brand)}.menu-toggle{display:none}.search-open,.menu-toggle{border:1px solid var(--line);background:var(--white);padding:9px 13px;border-radius:10px;cursor:pointer}.search-open:hover{border-color:var(--brand);color:var(--brand)}.search-modal[hidden]{display:none!important}.search-modal{position:fixed;inset:0;z-index:300;display:grid;place-items:start center;padding:9vh 20px 20px}.search-backdrop{position:absolute;inset:0;background:rgba(23,21,28,.76);backdrop-filter:blur(6px)}.search-dialog{position:relative;width:min(700px,100%);background:var(--white);border-radius:24px;padding:34px;box-shadow:0 30px 80px rgba(0,0,0,.28)}.search-close{position:absolute;right:18px;top:16px;border:0;background:transparent;font-size:30px;cursor:pointer;color:var(--muted)}.search-dialog h2{font-size:32px;margin:4px 0 18px}.search-form label{display:block;font-size:14px;color:var(--muted);margin-bottom:8px}.search-row{display:flex;gap:8px}.search-row input{min-width:0;flex:1;border:1px solid var(--line);border-radius:12px;padding:13px 14px;background:#fff}.search-row input:focus{outline:2px solid rgba(109,40,217,.22);border-color:var(--brand)}.search-row button{border:0;border-radius:12px;background:var(--brand);color:#fff;padding:0 20px;cursor:pointer}.eyebrow{text-transform:none;letter-spacing:.08em;font-weight:700;font-size:13px;color:var(--brand);margin:0 0 10px}.eyebrow.light{color:#D8C8FF}.lead{font-size:19px;line-height:1.85;color:#4D4754}.section-space{padding-block:78px}.section-heading{max-width:780px;margin-bottom:32px}.section-heading h2,.brand-strip h2,.dimension-note h2,.watch-close h2{font-size:clamp(28px,3.2vw,44px);line-height:1.22;margin:4px 0 14px;letter-spacing:-.025em}.section-heading p{color:var(--muted);margin:0}.split-heading{max-width:none;display:grid;grid-template-columns:1.2fr .8fr;gap:60px;align-items:end}.split-heading>p{font-size:16px;padding-bottom:8px}.button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:11px 17px;border-radius:12px;font-weight:700;border:1px solid transparent}.button.primary{background:var(--brand);color:#fff}.button.secondary{background:#fff;border-color:var(--line);color:var(--ink)}.button.ghost{background:transparent;border-color:rgba(255,255,255,.34);color:#fff}.button:hover{transform:translateY(-1px)}.text-link{display:inline-flex;align-items:center;gap:8px;font-weight:700;color:var(--brand);text-decoration:underline;text-decoration-color:rgba(109,40,217,.28);text-underline-offset:5px}.text-link:after{content:"→"}.light-link{color:#E9DEFF;text-decoration-color:rgba(255,255,255,.3)}.tag{display:inline-block;font-size:12px;line-height:1;padding:7px 9px;border-radius:999px;background:#E9DDFB;color:#5B21B6;font-weight:700}.soft-section{background:var(--soft)}.dark-section{background:var(--dark);color:#fff}.breadcrumb{width:min(var(--max),calc(100% - 48px));margin:22px auto 0}.breadcrumb ol{display:flex;gap:8px;align-items:center;list-style:none;padding:0;margin:0;color:var(--muted);font-size:13px;flex-wrap:wrap}.breadcrumb li:not(:last-child)::after{content:"/";margin-left:8px;color:#AAA3B1}.breadcrumb a:hover{color:var(--brand)}
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.site-footer{background:#110F14;color:#D9D4DE;padding:60px 0 24px}.footer-grid{width:min(var(--max),calc(100% - 48px));margin:auto;display:grid;grid-template-columns:1.6fr repeat(3,1fr);gap:50px}.footer-grid h2{font-size:13px;color:#fff;margin:0 0 14px}.footer-grid a{display:block;font-size:14px;color:#BEB7C6;margin:8px 0}.footer-grid a:hover{color:#fff}.footer-intro p{max-width:420px;color:#9E97A6;font-size:14px}.footer-brand{font-size:32px!important;color:#fff!important;font-weight:900}.footer-bottom{width:min(var(--max),calc(100% - 48px));margin:40px auto 0;padding-top:20px;border-top:1px solid #2A2630;display:flex;justify-content:space-between;color:#817A89;font-size:12px}.back-top{position:fixed;right:18px;bottom:18px;width:42px;height:42px;border:1px solid var(--line);border-radius:50%;background:#fff;color:var(--brand);box-shadow:var(--shadow);cursor:pointer;opacity:0;pointer-events:none;transform:translateY(10px);transition:.2s}.back-top.visible{opacity:1;pointer-events:auto;transform:none}
.article-checklist,.article-questions{margin:44px 0 0;padding:26px;border-radius:18px;background:#fff;border:1px solid var(--line)}.article-checklist h2,.article-questions h2{margin:0 0 14px;font-size:24px}.article-checklist ul,.article-questions ol{margin:0;padding-left:22px}.article-checklist li,.article-questions li{margin:10px 0;color:#4F4957}.library-section+.library-section{padding-top:10px}.library-list{border-top:1px solid var(--line)}.library-list article{display:grid;grid-template-columns:1fr auto;gap:28px;padding:20px 0;border-bottom:1px solid var(--line)}.library-list h3{font-size:20px;line-height:1.4;margin:7px 0 5px}.library-list h3 a:hover{color:var(--brand)}.library-list p{margin:0;color:var(--muted)}.library-list time{font-size:12px;color:var(--muted);padding-top:6px}
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