:root{--brand:#1677EE;--bright:#3395FF;--deep:#0A315E;--footer:#071D37;--dark:#16243A;--text:#3C485A;--muted:#6B7787;--pale:#F7FAFF;--ice:#EDF5FF;--soft:#E5F1FF;--line:rgba(22,119,238,.12);--shadow:0 12px 34px rgba(30,72,120,.08);--brandshadow:0 14px 40px rgba(22,119,238,.14)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",Arial,sans-serif;color:var(--text);background:#fff;line-height:1.72;overflow-x:hidden}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer}.wrap{width:min(1320px,calc(100% - 40px));margin:auto}.skip-link{position:fixed;left:12px;top:-60px;z-index:9999;background:#fff;color:#075FC6;padding:10px 14px;border-radius:10px;box-shadow:var(--shadow)}.skip-link:focus{top:12px}.site-header{height:74px;position:sticky;top:0;z-index:1000;background:rgba(255,255,255,.96);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}.desktop-nav{height:74px;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:28px}.brand{display:flex;align-items:center;gap:10px;min-width:170px}.brand strong,.mobile-brand strong{color:var(--dark);font-size:18px}.brand small{display:block;color:var(--muted);font-size:10px;letter-spacing:2px}.logo-slot{width:38px;height:38px;border-radius:12px;background:linear-gradient(145deg,#e8f3ff,#fff);border:1px solid var(--line);display:grid;place-items:center;overflow:hidden;flex:0 0 auto}.logo-slot img,.mobile-logo img{width:100%;height:100%;object-fit:contain}.logo-slot.large{width:52px;height:52px;border-radius:16px}.main-nav{display:flex;align-items:center;justify-content:center;gap:6px;white-space:nowrap;min-width:0}.main-nav a,.nav-actions a,.nav-actions button{min-height:44px;display:inline-flex;align-items:center;justify-content:center;padding:0 13px;border-radius:999px;border:0;background:transparent;color:var(--text);white-space:nowrap}.main-nav a:hover,.nav-actions a:hover,.nav-actions button:hover,.main-nav a:focus-visible,.nav-actions a:focus-visible,.nav-actions button:focus-visible{background:var(--ice);outline:none}.main-nav a.active{background:var(--ice);color:var(--deep);font-weight:700}.main-nav a.active:before{content:"";width:6px;height:6px;border-radius:50%;background:var(--brand);margin-right:7px}.nav-actions{display:flex;align-items:center;gap:3px}.app-chip{background:linear-gradient(135deg,#3998FF,#1677EE 55%,#075FC6)!important;color:#fff!important}.mobile-nav{display:none;height:62px;align-items:center;justify-content:space-between}.mobile-brand{display:flex;align-items:center;gap:8px}.mobile-logo{width:30px;height:30px;border-radius:9px;overflow:hidden;background:var(--ice);border:1px solid var(--line)}.icon-btn{width:44px;height:44px;border:0;background:var(--ice);border-radius:13px;color:var(--deep);font-size:22px}.panel-open{overflow:hidden}.overlay{position:fixed;inset:0;background:rgba(7,29,55,.45);z-index:1090;opacity:0;transition:.2s}.overlay.show{opacity:1}.drawer,.search-panel{position:fixed;z-index:1100;background:#fff;box-shadow:0 24px 70px rgba(7,29,55,.2);visibility:hidden;pointer-events:none;opacity:0;transition:.22s ease}.drawer{top:84px;left:50%;transform:translate(-50%,-12px);width:min(1180px,calc(100% - 40px));border-radius:24px;padding:24px}.search-panel{top:0;right:0;height:100%;width:min(480px,100%);padding:24px;transform:translateX(105%)}.drawer.open,.search-panel.open{visibility:visible;pointer-events:auto;opacity:1}.drawer.open{transform:translate(-50%,0)}.search-panel.open{transform:translateX(0)}.drawer-head{display:flex;justify-content:space-between;align-items:center;gap:16px;border-bottom:1px solid var(--line);padding-bottom:18px}.drawer-head>button{width:44px;height:44px;border:0;border-radius:50%;background:var(--ice);font-size:26px;color:var(--deep)}.drawer-brand{display:flex;align-items:center;gap:12px}.drawer-head small{display:block;color:var(--muted)}.mega-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:18px;padding-top:20px}.mega-grid section{background:var(--pale);padding:18px;border-radius:18px}.mega-grid h2{font-size:15px;color:var(--deep);margin:0 0 10px}.mega-grid a{display:block;padding:8px 0;font-size:14px}.search-form{padding:24px 0}.search-form label{display:block;font-weight:700;color:var(--dark);margin-bottom:8px}.search-form>div{display:flex;gap:8px}.search-form input{flex:1;min-width:0;border:1px solid var(--line);padding:12px 14px;border-radius:12px;outline:none}.search-form input:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(22,119,238,.12)}.search-form button,.primary-btn{border:0;color:#fff;background:linear-gradient(135deg,#3998FF 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img{width:100%;height:100%;object-fit:cover}.app-preview-image{aspect-ratio:9/16;max-height:520px;width:min(100%,360px);margin:auto;background:linear-gradient(160deg,#0A315E,#1677EE 65%,#EDF5FF)}.app-preview-image img{object-fit:contain}.copy h3{color:var(--dark);font-size:28px;margin:0 0 10px}.copy p{margin:0 0 14px}.pill-list{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}.pill-list span,.pill-list a{background:var(--ice);color:var(--deep);border-radius:999px;padding:9px 13px;font-size:14px}.timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.time-card{border-left:4px solid var(--brand);background:#fff;padding:22px;border-radius:0 18px 18px 0;box-shadow:var(--shadow)}.time-card strong{color:var(--deep);display:block;margin-bottom:8px}.route{display:grid;grid-template-columns:repeat(6,1fr);gap:10px}.route div{position:relative;background:var(--ice);border:1px solid var(--line);padding:18px 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h1{font-size:clamp(36px,4vw,46px);line-height:1.15;margin:8px 0 12px}.page-intro p{font-size:17px;color:var(--muted);margin:0}.intro-note{padding:16px 18px;border-left:3px solid var(--brand);background:var(--ice);border-radius:0 14px 14px 0;color:var(--deep)}.prose{width:min(820px,calc(100% - 40px));margin:auto;padding:38px 0 66px}.prose h2{color:var(--dark);font-size:28px;margin:34px 0 10px}.prose h3{color:var(--deep);font-size:20px;margin:26px 0 8px}.prose p{margin:0 0 16px}.feature-list{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin:24px 0}.feature-list article{padding:20px;border-radius:16px;background:var(--pale);border:1px solid var(--line)}.feature-list h3{margin:0 0 8px}.faq{display:grid;gap:12px}.faq details{border:1px solid var(--line);border-radius:16px;padding:0 18px;background:#fff}.faq summary{cursor:pointer;color:var(--dark);font-weight:700;padding:18px 0}.faq details p{padding:0 0 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rgba(255,255,255,.12);font-size:13px;color:#DCEEFF}.mobile-bottom{display:none}.btn-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}.secondary-btn{display:inline-flex;align-items:center;min-height:44px;padding:10px 15px;border:1px solid var(--line);border-radius:12px;color:var(--deep);background:#fff}.primary-btn{display:inline-flex;align-items:center;min-height:44px}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid rgba(22,119,238,.26);outline-offset:2px}
@media(max-width:1120px){.desktop-nav{gap:14px}.brand{min-width:auto}.brand small{display:none}.main-nav a,.nav-actions a,.nav-actions button{padding:0 9px}.mega-grid{grid-template-columns:repeat(3,1fr)}.route{grid-template-columns:repeat(3,1fr)}.interest-wall{grid-template-columns:repeat(4,1fr)}}
@media(max-width:920px){.desktop-nav{display:none}.mobile-nav{display:flex}.site-header{height:62px}.drawer{top:0;left:0;width:100%;height:100%;border-radius:0;transform:translateY(-10px);overflow:auto}.drawer.open{transform:none}.mega-grid{grid-template-columns:repeat(2,1fr)}.hero-banner{margin-top:16px;aspect-ratio:16/10}.hero-copy h1{font-size:36px}.four-nav{grid-template-columns:repeat(2,1fr)}.editor-grid,.qa-grid,.guide-grid,.topic-grid{grid-template-columns:1fr 1fr}.editor-grid .large{grid-row:auto}.split,.story-feature,.culture-list,.footer-top,.page-intro .wrap{grid-template-columns:1fr}.interest-wall{grid-template-columns:repeat(3,1fr)}.timeline{grid-template-columns:1fr 1fr}.footer-links{grid-template-columns:repeat(2,1fr)}.mobile-bottom{position:fixed;z-index:950;bottom:0;left:0;right:0;height:calc(58px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);display:grid;grid-template-columns:repeat(5,1fr);background:rgba(255,255,255,.97);border-top:1px solid var(--line);backdrop-filter:blur(12px)}.mobile-bottom a{display:grid;place-items:center;min-height:54px;font-size:13px;color:var(--deep)}.site-footer{padding-bottom:calc(90px + env(safe-area-inset-bottom))}}
@media(max-width:767px){.wrap{width:min(100% - 28px,1320px)}.hero-banner{width:calc(100% - 28px);border-radius:22px;max-height:none}.hero-fallback{padding:18px}.hero-copy{padding:18px;border-radius:16px}.hero-copy h1{font-size:clamp(30px,9vw,38px)}.hero-copy p{font-size:15px}.section{padding:42px 0}.section h2{font-size:26px}.section-head{display:block}.section-head p{margin-top:8px}.editor-grid,.qa-grid,.guide-grid,.topic-grid,.timeline,.short-stories{grid-template-columns:1fr}.four-nav{margin-bottom:24px}.four-nav a{min-height:84px}.split{gap:22px}.split .copy{order:2}.city-feature-image{order:1}.interest-wall{grid-template-columns:1fr 1fr}.interest-wall a{min-height:94px}.route{grid-template-columns:1fr 1fr}.media-grid{grid-template-columns:1fr 1fr;grid-template-rows:220px 170px 170px}.media-slot.wide{grid-column:span 2;grid-row:auto}.pulse-list article{grid-template-columns:1fr;gap:4px}.page-intro{padding:46px 0 24px}.page-intro h1{font-size:32px}.page-intro p{font-size:16px}.feature-list{grid-template-columns:1fr}.prose{width:calc(100% - 28px);padding-top:26px}.prose h2{font-size:25px}.app-preview-image{max-width:320px}.mega-grid{grid-template-columns:1fr 1fr}.footer-links{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.four-nav,.interest-wall,.route,.mega-grid,.footer-links{grid-template-columns:1fr}.hero-copy{max-width:100%}.hero-copy p{display:none}.media-grid{display:grid;grid-template-columns:1fr;grid-template-rows:repeat(6,180px)}.media-slot.wide{grid-column:auto}.search-panel{padding:18px}.search-form>div{flex-direction:column}.footer-brand{max-width:none}}

.app-brand-icon{width:58px;height:58px;border-radius:16px;background:var(--ice);border:1px solid var(--line);display:grid;place-items:center;margin-bottom:14px;overflow:hidden}.app-brand-icon img{width:100%;height:100%;object-fit:contain}.mini-brand-icon{width:18px;height:18px;border-radius:5px;overflow:hidden;display:grid;place-items:center;background:var(--ice)}.mini-brand-icon img{width:100%;height:100%;object-fit:contain}.mobile-bottom a{align-content:center;gap:1px}