:root{--bg:#F7F9FF;--surface:#fff;--soft:#EEF2FF;--title:#18203A;--text:#27324A;--muted:#55627A;--aux:#74809A;--blue:#2563EB;--blue2:#60A5FA;--blue3:#1D4ED8;--purple:#7C3AED;--purple2:#A78BFA;--purple3:#5B21B6;--border:rgba(99,102,241,.16);--shadow:0 14px 36px rgba(37,46,86,.08);--radius:14px;--max:1180px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;line-height:1.78;overflow-x:hidden}body.locked{overflow:hidden}a{color:inherit;text-decoration:none}img{display:block;max-width:100%;width:100%;height:100%;object-fit:contain;object-position:center}.wrap{width:min(var(--max),calc(100% - 32px));margin-inline:auto}.skip-link{position:fixed;left:16px;top:-60px;z-index:999;background:#fff;color:var(--blue3);padding:10px 14px;border-radius:8px}.skip-link:focus{top:12px}.site-header{position:sticky;top:0;z-index:60;background:#fff;border-bottom:1px solid var(--border)}.brand-bar{height:68px;display:flex;align-items:center;gap:20px}.brand{display:flex;align-items:center;gap:10px;min-width:190px}.brand-image{height:32px;max-width:170px}.brand-fallback{display:none;line-height:1.1}.brand-image:empty+.brand-fallback{display:flex;flex-direction:column}.brand-fallback strong{font-size:18px;color:var(--title)}.brand-fallback small{font-size:10px;letter-spacing:.18em;color:var(--purple)}.brand-slogan{flex:1;text-align:center;color:var(--muted);font-size:14px}.header-actions{display:flex;align-items:center;gap:8px}.icon-button,.app-link{min-width:44px;height:44px;border:1px solid var(--border);background:#fff;color:var(--title);border-radius:10px;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;font:inherit}.app-link{padding:0 14px;color:var(--blue3);font-weight:700}.icon-button:hover,.icon-button:focus-visible,.app-link:hover,.app-link:focus-visible{border-color:var(--blue);outline:3px solid rgba(37,99,235,.12)}.desktop-nav{height:48px;background:#fff}.nav-row{height:48px;display:flex;align-items:center;gap:28px}.nav-row a{height:48px;display:flex;align-items:center;border-bottom:3px solid transparent;color:var(--muted);font-size:15px;white-space:nowrap}.nav-row a:hover,.nav-row a:focus-visible,.nav-row a.active{color:var(--title);border-bottom-color:var(--purple)}main{min-height:60vh}.hero,.page-hero{padding:34px 0 20px}.cover-slot,.media-slot{width:100%;background:linear-gradient(135deg,#fff,#f1f4ff);border:1px solid var(--border);border-radius:16px;overflow:hidden;display:grid;place-items:center}.cover-slot{aspect-ratio:16/9;max-height:300px}.media-slot{aspect-ratio:3/2;max-height:220px}.cover-slot:empty,.media-slot:empty{min-height:130px}.hero-copy{padding:26px 0 10px;max-width:850px}.eyebrow{display:inline-block;color:var(--blue3);font-weight:800;font-size:13px;letter-spacing:.08em}.hero h1,.page-hero h1{font-size:clamp(28px,4vw,32px);line-height:1.2;color:var(--title);margin:10px 0 14px}.hero-lead,.page-lead{font-size:16px;color:var(--muted);max-width:860px}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}.button{min-height:44px;padding:10px 18px;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;font-weight:700;border:1px solid transparent}.button.primary{background:linear-gradient(135deg,#60A5FA 0%,#2563EB 48%,#7C3AED 100%);color:#fff}.button.secondary{background:#fff;color:var(--blue3);border-color:var(--border)}.button:hover,.button:focus-visible{transform:translateY(-1px);box-shadow:0 8px 20px rgba(37,99,235,.12);outline:none}.section{padding:48px 0}.section.soft{background:var(--soft)}.section-head{display:flex;justify-content:space-between;gap:24px;align-items:end;margin-bottom:22px}.section-head h2{font-size:24px;line-height:1.3;color:var(--title);margin:4px 0}.section-head p{max-width:650px;margin:0;color:var(--muted)}.grid-2,.grid-3,.grid-4{display:grid;gap:20px}.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}.card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}.card h3{margin:12px 0 8px;color:var(--title);font-size:20px;line-height:1.35}.card p{margin:0;color:var(--muted)}.card .meta{font-size:13px;color:var(--purple3);font-weight:700}.card-link{display:inline-flex;margin-top:14px;color:var(--blue3);font-weight:700}.feature-layout{display:grid;grid-template-columns:1.35fr .65fr;gap:22px}.compact-stack{display:grid;gap:14px}.compact{background:#fff;border:1px solid var(--border);border-radius:12px;padding:17px}.compact h3{font-size:18px;margin:0 0 6px;color:var(--title)}.split{display:grid;grid-template-columns:1fr 1fr;gap:26px;align-items:center}.split.reverse .media-slot{order:2}.topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.topic-item{background:#fff;border:1px solid var(--border);border-radius:12px;padding:18px}.topic-item h3{margin:0 0 8px;font-size:18px;color:var(--title)}.topic-item p{margin:0;color:var(--muted)}.editor-list,.timeline,.steps,.index-list{display:grid;gap:12px}.editor-item,.timeline-item,.step,.index-item{display:grid;grid-template-columns:auto 1fr;gap:14px;background:#fff;border:1px solid var(--border);border-radius:12px;padding:16px}.num{width:38px;height:38px;border-radius:10px;background:var(--soft);color:var(--purple3);display:grid;place-items:center;font-weight:800}.editor-item h3,.timeline-item h3,.step h3,.index-item h3{margin:0 0 4px;font-size:18px;color:var(--title)}.editor-item p,.timeline-item p,.step p,.index-item p{margin:0;color:var(--muted)}.page-shell{padding:30px 0 58px}.article-width{max-width:900px}.prose-section{margin-top:32px}.prose-section h2{font-size:22px;color:var(--title);margin:0 0 12px}.prose-section h3{font-size:18px;color:var(--title);margin:22px 0 8px}.prose-section p{margin:0 0 14px;color:var(--text)}.prose-section ul{padding-left:22px}.prose-section li{margin:7px 0}.note-box{background:var(--soft);border-left:4px solid var(--blue);border-radius:10px;padding:18px;margin:24px 0}.related{margin-top:38px;padding-top:24px;border-top:1px solid var(--border)}.related-links{display:flex;flex-wrap:wrap;gap:10px}.related-links a{background:#fff;border:1px solid var(--border);border-radius:10px;padding:9px 13px;color:var(--blue3)}.faq-list{display:grid;gap:14px}.faq-item{background:#fff;border:1px solid var(--border);border-radius:12px;padding:20px}.faq-item h2{font-size:18px;margin:0 0 10px;color:var(--title)}.faq-item p{margin:0;color:var(--text)}.site-footer{background:#171B36;color:#E8ECFF;padding:48px 0 calc(28px + env(safe-area-inset-bottom))}.footer-top{display:grid;grid-template-columns:1.1fr 2fr;gap:36px}.footer-mark{height:30px;max-width:160px;margin-bottom:12px}.footer-brand h2{margin:0 0 8px;font-size:22px}.footer-brand p{color:#bcc6e6;max-width:360px}.footer-groups{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}.footer-groups h3{font-size:15px;margin:0 0 10px;color:#fff}.footer-groups a{display:block;color:#cfd7f4;font-size:14px;padding:4px 0}.footer-groups a:hover,.footer-groups a:focus-visible{color:#fff;text-decoration:underline}.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:30px;padding-top:18px;color:#aeb8da;font-size:13px}.overlay{position:fixed;inset:0;background:rgba(17,24,39,.45);z-index:90;opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.overlay.open{opacity:1;visibility:visible;pointer-events:auto}.drawer{position:fixed;top:0;right:0;height:100dvh;width:min(400px,86vw);background:#fff;z-index:100;transform:translateX(102%);visibility:hidden;pointer-events:none;transition:.25s;box-shadow:-20px 0 50px rgba(20,25,60,.15)}.drawer.open{transform:none;visibility:visible;pointer-events:auto}.drawer-head{height:68px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 16px}.drawer-brand{display:flex;align-items:center;gap:10px;color:var(--title)}.drawer-brand img{height:30px;width:auto;max-width:145px}.drawer-body{height:calc(100dvh - 68px);overflow:auto;padding:14px 18px 30px}.drawer-body section{padding:13px 0}.drawer-body h2{font-size:14px;color:var(--purple3);margin:0 0 6px}.drawer-body a{display:grid;gap:2px;padding:10px 0;border-bottom:1px solid var(--border)}.drawer-body a strong{font-size:15px;color:var(--title)}.drawer-body a span{font-size:12px;color:var(--aux)}.search-panel{position:fixed;inset:0;z-index:101;display:grid;place-items:start center;padding-top:110px;visibility:hidden;pointer-events:none}.search-panel.open{visibility:visible;pointer-events:auto}.search-card{width:min(560px,calc(100% - 32px));background:#fff;border:1px solid var(--border);border-radius:16px;padding:22px;box-shadow:0 24px 70px rgba(20,25,60,.2)}.search-head{display:flex;justify-content:space-between;gap:20px;align-items:start}.search-head h2{margin:2px 0 14px;color:var(--title);font-size:24px}.search-card label{display:block;font-size:13px;color:var(--muted);margin-bottom:6px}.search-card input{width:100%;height:46px;border:1px solid var(--border);border-radius:10px;padding:0 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@media(max-width:900px){.brand-slogan{display:none}.grid-4{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(2,1fr)}.feature-layout,.split,.footer-top{grid-template-columns:1fr}.split.reverse .media-slot{order:0}.footer-groups{grid-template-columns:repeat(2,1fr)}}
@media(max-width:720px){body{padding-bottom:calc(54px + env(safe-area-inset-bottom))}.wrap{width:min(var(--max),calc(100% - 32px))}.brand-bar{height:62px}.brand{min-width:0;flex:1}.brand-image{height:28px;max-width:145px}.brand-fallback strong{font-size:16px}.app-link{display:none}.desktop-nav{display:none}.hero,.page-hero{padding-top:24px}.section{padding:32px 0}.section-head{display:block}.grid-2,.grid-3,.grid-4,.topic-grid{grid-template-columns:1fr}.cover-slot{max-height:300px}.media-slot{max-height:210px}.footer-groups{grid-template-columns:1fr 1fr}.site-footer{padding-bottom:34px}.mobile-bottom{position:fixed;left:0;right:0;bottom:0;z-index:70;height:calc(54px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:rgba(255,255,255,.98);border-top:1px solid var(--border);display:grid;grid-template-columns:repeat(5,1fr)}.mobile-bottom a{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--aux);font-size:16px;line-height:1}.mobile-bottom a em{font-style:normal;font-size:11px;margin-top:4px}.mobile-bottom a.active{color:var(--blue)}.mobile-bottom a.active:before{content:"";position:absolute;top:0;width:24px;height:2px;border-radius:2px;background:var(--blue)}.search-panel{place-items:start stretch;padding:62px 0 0}.search-card{width:100%;border-radius:0 0 16px 16px;border-left:0;border-right:0}.drawer-head{height:62px}.drawer-body{height:calc(100dvh - 62px)}}
@media(max-width:420px){.header-actions{gap:4px}.icon-button{min-width:44px}.footer-groups{grid-template-columns:1fr}.editor-item,.timeline-item,.step,.index-item{grid-template-columns:1fr}.num{width:34px;height:34px}}