:root{--brand:#1677EE;--bright:#3395FF;--deep:#075FC6;--ink:#16243A;--body:#3C485A;--muted:#6B7787;--pale:#F7FAFF;--ice:#EDF5FF;--soft:#E5F1FF;--navy:#0A315E;--footer:#071D37;--line:rgba(22,119,238,.12);--shadow:0 12px 34px rgba(30,72,120,.08);--bshadow:0 14px 40px rgba(22,119,238,.14);--shell:min(1320px,calc(100% - 40px))}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#fff;color:var(--body);font:16px/1.75 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif;overflow-x:hidden}a{color:inherit;text-decoration:none}img{display:block;max-width:100%}button{font:inherit;cursor:pointer}a,button{min-height:44px}.shell{width:var(--shell);margin:auto}.skip{position:fixed;top:-80px;left:12px;z-index:300;background:#fff;color:var(--deep);padding:10px 14px;border-radius:10px}.skip:focus{top:12px}
.site-header{position:sticky;top:0;z-index:80;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(14px)}.desktop-nav{height:74px;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:18px}.brand{display:flex;align-items:center;gap:10px;min-width:max-content}.brand>span:last-child{display:flex;flex-direction:column;line-height:1.15}.brand b{color:var(--ink);font-size:17px}.brand small{font-size:10px;letter-spacing:.18em;color:var(--muted);margin-top:4px}.logo{width:40px;height:40px;border:1px solid var(--line);border-radius:12px;display:grid;place-items:center;overflow:hidden;background:linear-gradient(135deg,var(--soft),#fff)}.logo.sm{width:32px;height:32px}.logo img{width:100%;height:100%;object-fit:contain}.primary-nav,.actions{display:flex;align-items:center;white-space:nowrap}.primary-nav{justify-content:center;gap:3px}.primary-nav a,.actions a,.actions button,.mobile-top button,.mega button,.search-panel button{display:inline-flex;align-items:center;justify-content:center;border:0;background:transparent;border-radius:12px;padding:0 12px;color:var(--ink)}.primary-nav a:hover,.actions a:hover,.actions button:hover,.primary-nav a:focus-visible,.actions button:focus-visible{background:var(--ice);color:var(--deep);outline:none}.primary-nav a.active{background:var(--ice);color:var(--deep);position:relative}.primary-nav a.active:after{content:"";position:absolute;width:6px;height:6px;border-radius:50%;background:var(--brand);left:50%;bottom:5px;transform:translateX(-50%)}.app-btn{color:#fff!important;background:linear-gradient(135deg,#3998FF,#1677EE 55%,#075FC6)!important;padding:0 17px!important}.mobile-top{display:none;height:62px;align-items:center;justify-content:space-between;padding:0 14px}.mobile-top>a{display:flex;align-items:center;gap:8px;color:var(--ink)}
main{min-height:60vh}.section{padding:72px 0}.section.compact{padding:52px 0}.alt{background:var(--pale)}.soft{background:linear-gradient(180deg,var(--ice),#fff)}.eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--deep);font-size:14px;font-weight:800}.eyebrow:before{content:"";width:18px;height:3px;border-radius:3px;background:var(--brand)}h1,h2,h3{color:var(--ink);line-height:1.25;margin:0 0 14px}h1{font-size:clamp(34px,4.2vw,52px);letter-spacing:-.03em}h2{font-size:clamp(25px,3vw,33px)}h3{font-size:20px}p{margin:0 0 16px}.section-head{display:flex;align-items:end;justify-content:space-between;gap:30px;margin-bottom:28px}.section-head p{max-width:660px;color:var(--muted);margin:0}
.hero-wrap{padding:36px 0 22px}.hero-banner{aspect-ratio:16/7;max-height:520px;min-height:260px;position:relative;overflow:hidden;border-radius:30px;background:linear-gradient(135deg,#eaf4ff,#dceeff 48%,#fff);border:1px solid var(--line);box-shadow:var(--bshadow)}.hero-banner>img{width:100%;height:100%;object-fit:contain;position:relative;z-index:1}.hero-overlay{position:absolute;z-index:2;left:5%;top:50%;transform:translateY(-50%);max-width:520px;padding:26px 28px;border-radius:22px;background:rgba(10,49,94,.84);color:#DCEEFF}.hero-overlay h1{color:#fff}.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:18px}.nav-tile{padding:20px;border:1px solid var(--line);border-radius:18px;background:#fff;box-shadow:var(--shadow)}.nav-tile:hover{transform:translateY(-3px)}.nav-tile strong{display:block;color:var(--ink);font-size:18px}.nav-tile span{font-size:14px;color:var(--muted)}
.editorial-grid{display:grid;grid-template-columns:1.35fr 1fr;gap:20px}.feature-card,.mid-card,.text-card,.guide-card,.topic-card,.index-item,.faq-item{border:1px solid var(--line);border-radius:22px;background:#fff;box-shadow:var(--shadow)}.feature-card{padding:34px;min-height:340px;background:linear-gradient(145deg,#fff,var(--ice))}.feature-card h3{font-size:28px}.stack{display:grid;gap:16px}.mid-card,.text-card,.guide-card,.topic-card,.index-item{padding:22px}.short-list{grid-column:1/-1;display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.btn{display:inline-flex;align-items:center;justify-content:center;padding:0 20px;border-radius:14px;background:linear-gradient(135deg,#3998FF,#1677EE 55%,#075FC6);color:#fff;font-weight:800;box-shadow:var(--bshadow)}.btn.secondary{background:#fff;color:var(--deep);border:1px solid var(--line);box-shadow:none}.split{display:grid;grid-template-columns:1.1fr .9fr;gap:38px;align-items:center}.city-feature-image,.app-preview-image,.media-slot{overflow:hidden;border:1px solid var(--line);border-radius:26px;background:linear-gradient(135deg,#dfeeff,#f9fcff)}.city-feature-image{aspect-ratio:4/3}.city-feature-image img{width:100%;height:100%;object-fit:cover}.app-preview-image{aspect-ratio:9/16;max-height:520px;justify-self:center}.app-preview-image img{width:100%;height:100%;object-fit:contain}
.timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.time-card{padding:24px;border:1px solid var(--line);border-radius:20px;background:#fff}.time-card b{display:block;color:var(--brand)}.route{display:grid;grid-template-columns:repeat(6,1fr);gap:12px}.route-step{padding:22px 18px;border-radius:18px;background:var(--ice);color:var(--ink);min-height:130px}.tag-wall{display:flex;flex-wrap:wrap;gap:12px}.tag-wall a{padding:12px 18px;border-radius:999px;background:#fff;border:1px solid var(--line);color:var(--ink);font-size:16px}.qa-grid,.guide-grid,.topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.story-layout{display:grid;grid-template-columns:1.35fr 1fr;gap:22px}.story-main{padding:32px;border-radius:26px;background:var(--navy);color:#DCEEFF}.story-main h3{color:#fff}.story-side{display:grid;grid-template-columns:1fr 1fr;gap:14px}.story-side article{padding:20px;border:1px solid var(--line);border-radius:18px;background:#fff}.gallery{display:grid;grid-template-columns:2fr 1fr 1fr;grid-auto-rows:190px;gap:14px}.gallery .media-slot:first-child{grid-row:span 2}.media-slot{min-height:160px;background:linear-gradient(145deg,#edf5ff,#fff 70%)}.info-strip{display:grid;grid-template-columns:auto 1fr;gap:18px;padding:18px 0;border-bottom:1px solid var(--line)}.info-strip b{color:var(--deep)}
.dark-section{background:var(--navy);color:#DCEEFF}.dark-section h2,.dark-section h3{color:#fff}.dark-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.dark-card{padding:22px;border:1px solid rgba(255,255,255,.12);border-radius:20px;background:rgba(255,255,255,.07)}.app-cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}.page-hero{padding:70px 0 44px;background:linear-gradient(180deg,var(--ice),#fff)}.page-hero .inner{max-width:900px;margin-left:0}.page-hero p{font-size:18px;color:var(--muted);max-width:800px}.article-wrap{max-width:820px;margin:auto}.article-wrap h2{margin-top:36px}.index-wall{display:grid;grid-template-columns:repeat(2,1fr);gap:15px}.index-item strong{display:block;color:var(--ink);font-size:20px}.index-item p{margin-bottom:0}.faq-list{display:grid;gap:12px}.faq-item{overflow:hidden}.faq-item summary{padding:18px 22px;color:var(--ink);font-weight:800;cursor:pointer;min-height:56px}.faq-item p{padding:0 22px 20px;margin:0}
.overlay{position:fixed;inset:0;z-index:110;background:rgba(7,29,55,.42)}.overlay[hidden]{display:none!important}.mega,.search-panel{position:fixed;z-index:120;inset:74px 0 auto;opacity:0;visibility:hidden;pointer-events:none;transform:translateY(-10px);transition:.2s}.mega.open,.search-panel.open{opacity:1;visibility:visible;pointer-events:auto;transform:none}.mega{background:#fff;box-shadow:0 30px 70px rgba(14,51,90,.14)}.mega-inner{padding:24px 0 32px}.mega-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.mega-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}.mega-grid h2{font-size:15px;color:var(--deep)}.mega-grid a{display:flex;align-items:center;min-height:38px}.search-panel{display:grid;place-items:center;padding:28px 20px}.search-card{width:min(760px,100%);padding:26px;border:1px solid var(--line);border-radius:24px;background:#fff;box-shadow:0 26px 70px rgba(14,51,90,.18)}.panel-head{display:flex;align-items:center;justify-content:space-between}.panel-head b{font-size:22px;color:var(--ink)}.search-links{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.search-links a{display:grid;place-items:center;border-radius:14px;background:var(--ice);color:var(--deep)}.panel-open{overflow:hidden}.mobile-bottom{display:none}
.site-footer{background:var(--footer);color:#DCEEFF;border-top:1px solid rgba(220,238,255,.16);padding:58px 0 22px}.footer-grid{display:grid;grid-template-columns:2fr repeat(4,1fr);gap:32px}.footer-grid h2{font-size:15px;color:#fff}.footer-grid a{display:flex;align-items:center;min-height:34px}.footer-brand p{max-width:440px;color:#c5d9ee}.footer-brand .brand b{color:#fff}.footer-brand .brand small{color:#DCEEFF}.footer-bottom{display:flex;justify-content:space-between;gap:20px;border-top:1px solid rgba(255,255,255,.12);margin-top:34px;padding-top:18px;color:#b8cee5;font-size:14px}
@media(max-width:1180px){.desktop-nav{gap:6px}.primary-nav a,.actions a,.actions button{padding:0 8px}.brand>span:last-child{display:none}.route{grid-template-columns:repeat(3,1fr)}.qa-grid,.guide-grid,.topic-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:900px){.desktop-nav{display:none}.mobile-top{display:flex}.site-header{height:62px}.mega,.search-panel{inset:62px 0 auto}.mega{height:calc(100dvh - 62px);overflow:auto}.mega-grid{grid-template-columns:1fr 1fr}.hero-banner{aspect-ratio:16/10;min-height:0}.hero-overlay{left:4%;right:4%;max-width:none;padding:18px 20px}.grid-4{grid-template-columns:1fr 1fr}.editorial-grid,.split,.story-layout{grid-template-columns:1fr}.short-list{grid-template-columns:1fr}.timeline{grid-template-columns:1fr 1fr}.route{grid-template-columns:1fr 1fr}.gallery{grid-template-columns:1fr 1fr;grid-auto-rows:160px}.gallery .media-slot:first-child{grid-column:1/-1;grid-row:span 2}.footer-grid{grid-template-columns:2fr 1fr 1fr}.footer-brand{grid-column:1/-1}.mobile-bottom{position:fixed;z-index:75;left:10px;right:10px;bottom:calc(8px + env(safe-area-inset-bottom));height:58px;display:grid;grid-template-columns:repeat(5,1fr);border:1px solid var(--line);border-radius:18px;background:rgba(255,255,255,.96);box-shadow:0 12px 40px rgba(20,55,92,.16)}.mobile-bottom a{display:grid;place-items:center;color:var(--ink);font-size:14px}.site-footer{padding-bottom:100px}}
@media(max-width:640px){:root{--shell:min(100% - 28px,1320px)}body{font-size:15px}.section{padding:54px 0}.section.compact{padding:42px 0}h1{font-size:clamp(30px,10vw,38px)}h2{font-size:26px}.page-hero{padding:48px 0 30px}.page-hero p{font-size:16px}.hero-overlay{top:auto;bottom:12px;transform:none}.hero-overlay h1{font-size:31px}.hero-overlay p{display:none}.grid-4{gap:10px}.nav-tile{padding:16px}.nav-tile strong{font-size:16px}.section-head{display:block}.section-head p{margin-top:8px}.feature-card{padding:24px;min-height:0}.feature-card h3{font-size:23px}.timeline,.qa-grid,.guide-grid,.topic-grid,.index-wall{grid-template-columns:1fr}.story-side{grid-template-columns:1fr}.gallery{grid-template-columns:1fr;grid-auto-rows:190px}.gallery .media-slot:first-child{grid-column:auto;grid-row:span 1}.dark-grid{grid-template-columns:1fr}.search-links{grid-template-columns:1fr 1fr}.footer-grid{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}.footer-bottom{flex-direction:column}.mega-grid{grid-template-columns:1fr}.app-preview-image{max-width:320px}}