:root{--bg:#F7F9FF;--surface:#fff;--soft:#EEF2FF;--title:#18203A;--text:#27324A;--muted:#55627A;--assist:#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","Microsoft YaHei",Arial,sans-serif;line-height:1.75;overflow-x:hidden}body.ui-open{overflow:hidden}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}.container{width:min(var(--max),calc(100% - 32px));margin:0 auto}.skip-link{position:fixed;left:12px;top:-60px;z-index:9999;background:#fff;padding:10px 14px;border-radius:8px;box-shadow:var(--shadow)}.skip-link:focus{top:12px}.site-header{position:sticky;top:0;z-index:100;background:#fff;border-bottom:1px solid var(--border)}.brand-bar{height:68px;border-bottom:1px solid var(--border)}.brand-row{height:100%;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:24px}.brand{display:inline-flex;align-items:center;min-width:150px}.brand-mark{height:30px;width:auto;max-width:180px;object-fit:contain}.brand-fallback{display:flex;align-items:baseline;gap:8px;color:var(--title)}.brand-fallback strong{font-size:20px}.brand-fallback small{font-size:11px;color:var(--purple);letter-spacing:.12em}.brand-slogan{text-align:center;color:var(--muted);font-size:14px}.header-actions{display:flex;align-items:center;gap:8px}.icon-btn,.app-link,.close-btn{min-height:44px;border:1px solid var(--border);background:#fff;color:var(--title);border-radius:10px;padding:0 13px;display:inline-flex;align-items:center;justify-content:center;gap:6px;font:inherit;cursor:pointer}.icon-btn:hover,.app-link:hover,.icon-btn:focus-visible,.app-link:focus-visible,.close-btn:focus-visible{border-color:var(--blue);outline:3px solid rgba(37,99,235,.12)}.main-nav{height:48px;background:#fff}.nav-row{height:100%;display:flex;align-items:center;gap:30px;white-space:nowrap}.nav-row a{height:100%;display:flex;align-items:center;border-bottom:3px solid transparent;color:var(--muted);font-size:15px}.nav-row a:hover,.nav-row a.active{color:var(--title);border-bottom-color:var(--purple)}main{min-height:55vh}.section{padding:56px 0}.section.tight{padding:34px 0}.hero{padding:34px 0 60px}.hero-image,.media-slot{width:100%;background:#fff;border:1px solid var(--border);border-radius:16px;overflow:hidden;display:flex;align-items:center;justify-content:center}.hero-image{aspect-ratio:16/9;max-height:300px}.hero-image img,.media-slot img{width:100%;height:100%;object-fit:contain;object-position:center}.hero-copy{max-width:820px;margin-top:28px}.eyebrow{display:inline-block;color:var(--purple);font-size:13px;font-weight:700;letter-spacing:.12em}.hero h1,.page-hero h1{margin:7px 0 12px;color:var(--title);font-size:clamp(28px,4vw,32px);line-height:1.28}.lead{font-size:17px;color:var(--muted);max-width:850px}.buttons{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}.btn{min-height:44px;padding:10px 18px;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;font-weight:700}.btn.primary{background:linear-gradient(135deg,#60A5FA 0%,#2563EB 48%,#7C3AED 100%);color:#fff}.btn.secondary{background:#fff;color:var(--blue3);border:1px solid var(--border)}.btn:hover,.btn:focus-visible{transform:translateY(-1px);outline:3px solid rgba(37,99,235,.12)}.section-title{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:22px}.section-title h2{margin:0;color:var(--title);font-size:clamp(22px,3vw,26px)}.section-title p{margin:0;color:var(--muted);max-width:620px}.grid{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:22px;box-shadow:var(--shadow)}.card h3{margin:0 0 8px;color:var(--title);font-size:20px}.card p{margin:0;color:var(--muted)}.card-link{display:block;transition:.2s ease}.card-link:hover{border-color:rgba(37,99,235,.45);transform:translateY(-2px)}.feature-grid{display:grid;grid-template-columns:1.35fr .65fr;gap:20px}.feature-stack{display:grid;gap:16px}.feature-main{padding:28px;min-height:280px;background:linear-gradient(145deg,#fff,#EEF2FF);border:1px solid var(--border);border-radius:16px}.feature-main h2{font-size:27px;margin:10px 0}.feature-main p{color:var(--muted)}.split{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:center}.split.reverse .media-slot{order:2}.split.reverse .copy{order:1}.media-slot{aspect-ratio:3/2;max-height:220px}.copy h2{font-size:25px;color:var(--title);margin:0 0 12px}.copy p{color:var(--muted)}.topic-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.topic{background:#fff;border:1px solid var(--border);border-radius:12px;padding:18px}.topic b{display:block;color:var(--title);margin-bottom:5px}.editor-list{background:#fff;border:1px solid var(--border);border-radius:16px;overflow:hidden}.editor-list a{display:grid;grid-template-columns:42px 1fr auto;gap:14px;align-items:center;padding:18px 20px;border-bottom:1px solid var(--border)}.editor-list a:last-child{border-bottom:0}.editor-list .num{font-weight:800;color:var(--purple)}.editor-list small{color:var(--assist)}.timeline{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.timeline article{position:relative;background:#fff;border:1px solid var(--border);border-radius:14px;padding:22px}.timeline article:before{content:"";position:absolute;left:22px;top:0;width:48px;height:3px;background:linear-gradient(90deg,var(--blue2),var(--purple))}.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.step{background:#fff;border:1px solid var(--border);border-radius:14px;padding:20px}.step .step-no{font-weight:800;color:var(--blue);font-size:13px}.page-hero{padding:52px 0 30px}.page-shell{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:30px;align-items:start}.prose{background:#fff;border:1px solid var(--border);border-radius:16px;padding:28px;box-shadow:var(--shadow)}.prose h2{color:var(--title);font-size:23px;margin:32px 0 12px;padding-top:4px}.prose h2:first-child{margin-top:0}.prose h3{color:var(--title);font-size:19px;margin:22px 0 8px}.prose p{margin:0 0 16px}.prose ul,.prose ol{padding-left:1.3em}.prose li{margin:8px 0}.note{background:var(--soft);border-left:4px solid var(--blue);padding:15px 18px;border-radius:0 10px 10px 0;color:var(--muted);margin:18px 0}.side-index{position:sticky;top:138px;background:#fff;border:1px solid var(--border);border-radius:14px;padding:18px}.side-index h3{margin:0 0 10px;font-size:17px;color:var(--title)}.side-index a{display:block;padding:7px 0;color:var(--muted)}.side-index a:hover{color:var(--blue)}.related{margin-top:26px;padding-top:20px;border-top:1px solid var(--border)}.related-links{display:flex;flex-wrap:wrap;gap:10px}.related-links a{padding:8px 12px;border:1px solid var(--border);border-radius:9px;background:#fff;color:var(--blue3)}.faq-list{display:grid;gap:14px}.faq-item{background:#fff;border:1px solid var(--border);border-radius:14px;padding:22px}.faq-item h2{font-size:19px;margin:0 0 8px}.faq-item p{margin:0;color:var(--muted)}.site-footer{background:#171B36;color:#E8ECFF;padding:52px 0 80px;margin-top:56px}.footer-top{display:grid;grid-template-columns:1.05fr 2fr;gap:42px}.footer-mark{height:30px;width:auto;object-fit:contain;filter:brightness(0) invert(1);margin-bottom:16px}.footer-brand h2{margin:0 0 10px}.footer-brand p{color:#B9C2E7}.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}.footer-grid h3{font-size:15px;margin:0 0 10px;color:#fff}.footer-grid a{display:block;color:#C7CFF0;padding:4px 0;font-size:14px}.footer-grid a:hover{color:#fff}.footer-note,.copyright{border-top:1px solid rgba(255,255,255,.1);padding-top:18px;margin-top:28px;color:#B9C2E7;font-size:13px}.copyright{margin-top:12px}.overlay{position:fixed;inset:0;background:rgba(14,18,42,.45);z-index:500;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;width:min(400px,86vw);height:100dvh;background:#fff;z-index:600;transform:translateX(105%);visibility:hidden;pointer-events:none;transition:.25s;overflow:auto}.drawer.open{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-head{position:sticky;top:0;background:#fff;border-bottom:1px solid var(--border);padding:16px 18px;display:flex;align-items:center;justify-content:space-between;z-index:2}.drawer-brand{display:flex;align-items:center;gap:10px}.drawer-brand img{height:28px;width:auto}.close-btn{font-size:24px;width:44px;padding:0}.drawer-groups{padding:8px 18px 30px}.drawer-groups section{padding:15px 0;border-bottom:1px solid var(--border)}.drawer-groups h3{margin:0 0 6px;color:var(--title);font-size:15px}.drawer-groups a{display:block;padding:10px 0}.drawer-groups b{display:block;color:var(--title);font-size:15px}.drawer-groups span{display:block;color:var(--assist);font-size:13px}.search-panel{position:fixed;top:110px;left:50%;transform:translate(-50%,-12px);width:min(560px,calc(100vw - 32px));background:#fff;border:1px solid var(--border);border-radius:16px;box-shadow:0 30px 80px rgba(23,27,54,.25);z-index:650;padding:22px;opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.search-panel.open{opacity:1;visibility:visible;pointer-events:auto;transform:translate(-50%,0)}.search-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px}.search-head h2{margin:2px 0 14px}.search-field span{display:block;color:var(--muted);font-size:13px;margin-bottom:6px}.search-field input{width:100%;min-height:46px;border:1px solid var(--border);border-radius:10px;padding:0 14px;font:inherit;color:var(--text);outline:none}.search-field input:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(37,99,235,.1)}.quick-links{display:flex;flex-wrap:wrap;gap:9px;margin-top:16px}.quick-links a{padding:8px 11px;border:1px solid var(--border);border-radius:9px;background:var(--soft);color:var(--blue3)}.mobile-bottom{display:none}.back-home{margin-top:30px}.status-list{display:grid;gap:12px}.status-row{display:grid;grid-template-columns:150px 1fr;gap:14px;padding:16px 0;border-bottom:1px solid var(--border)}.status-row:last-child{border-bottom:0}.status-row b{color:var(--title)}.phone-wrap{display:grid;grid-template-columns:360px 1fr;gap:36px;align-items:center}.phone-media{background:#fff;border:1px solid var(--border);border-radius:20px;padding:18px;display:flex;justify-content:center}.phone-media img{max-height:420px;width:auto;max-width:100%;object-fit:contain}.mini-badge{width:64px;height:64px;object-fit:contain;border-radius:14px}.number-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.number-card{display:grid;grid-template-columns:54px 1fr;gap:14px;background:#fff;border:1px solid var(--border);border-radius:14px;padding:20px}.number-card .n{font-weight:900;color:var(--purple);font-size:24px}.number-card h3{margin:0 0 6px;font-size:19px}.number-card p{margin:0;color:var(--muted)}@media(max-width:900px){.brand-slogan{display:none}.brand-row{grid-template-columns:1fr auto}.feature-grid,.split,.page-shell,.phone-wrap{grid-template-columns:1fr}.side-index{position:static}.grid-3{grid-template-columns:repeat(2,1fr)}.grid-4{grid-template-columns:repeat(2,1fr)}.topic-list{grid-template-columns:repeat(2,1fr)}.steps{grid-template-columns:repeat(2,1fr)}.footer-top{grid-template-columns:1fr}.footer-grid{grid-template-columns:repeat(2,1fr)}.split.reverse .media-slot,.split.reverse .copy{order:initial}.phone-media{max-width:420px}.main-nav{display:none}.site-header{position:sticky}.search-panel{top:76px}.page-hero{padding-top:38px}}@media(max-width:640px){.container{width:min(var(--max),calc(100% - 32px))}.brand-bar{height:62px}.brand{min-width:0}.brand-mark{height:28px;max-width:145px}.brand-fallback small{display:none}.app-link{display:none}.icon-btn{width:44px;padding:0;font-size:19px}.icon-btn span{display:none}.header-actions{gap:4px}.section{padding:34px 0}.hero{padding:24px 0 38px}.hero-copy{margin-top:20px}.grid-2,.grid-3,.grid-4,.feature-grid,.topic-list,.timeline,.steps,.number-grid{grid-template-columns:1fr}.section-title{display:block}.section-title p{margin-top:8px}.card{padding:18px}.feature-main{min-height:auto;padding:22px}.editor-list a{grid-template-columns:36px 1fr}.editor-list small{display:none}.prose{padding:20px}.site-footer{padding-bottom:92px}.footer-grid{grid-template-columns:repeat(2,1fr);gap:20px}.mobile-bottom{display:grid;position:fixed;left:0;right:0;bottom:0;height:calc(54px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);grid-template-columns:repeat(5,1fr);background:#fff;border-top:1px solid var(--border);z-index:90}.mobile-bottom a{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;font-size:11px;color:var(--muted);line-height:1.15}.mobile-bottom a span{font-size:17px;margin-bottom:3px}.mobile-bottom a.active{color:var(--blue)}.mobile-bottom a.active:before{content:"";position:absolute;top:0;width:24px;height:2px;background:var(--blue)}.status-row{grid-template-columns:1fr;gap:4px}.page-hero{padding:32px 0 20px}.lead{font-size:16px}.drawer{width:86vw}.hero-image{max-height:240px}.media-slot{max-height:210px}.phone-media{max-width:100%}}