*{box-sizing:border-box}:root{--brand:#1677EE;--bright:#3395FF;--deep:#075FC6;--navy:#0A315E;--footer:#071D37;--ink:#16243A;--text:#3C485A;--muted:#6B7787;--soft:#929BA8;--ice:#F7FAFF;--pale:#EDF5FF;--wash:#E5F1FF;--line:rgba(22,119,238,.12);--darkline:rgba(255,255,255,.12);--shadow:0 12px 34px rgba(30,72,120,.08);--brandshadow:0 14px 40px rgba(22,119,238,.14)}
html{scroll-behavior:smooth}body{margin:0;background:#fff;color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.72;overflow-x:hidden}body.panel-open{overflow:hidden}img{max-width:100%;display:block}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer}.shell{width:min(1320px,calc(100% - 48px));margin:0 auto}
.site-header{position:sticky;top:0;z-index:50;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 minmax(0,1fr) auto;align-items:center;gap:24px}.brand-island,.mobile-brand{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--ink)}.logo-slot{width:36px;height:36px;border-radius:12px;background:linear-gradient(145deg,#eef6ff,#d7eaff);display:flex;align-items:center;justify-content:center;overflow:hidden;flex:0 0 auto}.logo-slot img{width:100%;height:100%;object-fit:contain}.brand-name{white-space:nowrap}.primary-nav{display:flex;justify-content:center;gap:4px;white-space:nowrap}.primary-nav a,.nav-tools a,.nav-tools button{min-height:44px;display:inline-flex;align-items:center;justify-content:center;padding:0 12px;border-radius:14px;color:#46556b;font-size:15px}.primary-nav a.active,.nav-tools a.active{background:var(--pale);color:var(--deep);font-weight:700;position:relative}.primary-nav a.active:after,.nav-tools a.active:after{content:"";width:6px;height:6px;border-radius:50%;background:var(--brand);position:absolute;bottom:5px}.nav-tools{display:flex;align-items:center;gap:4px;white-space:nowrap}.icon-button,.menu-button,.close-button{border:0;background:#fff;color:var(--ink)}.icon-button:hover,.menu-button:hover,.close-button:hover,.primary-nav a:hover,.nav-tools a:hover{background:var(--pale);color:var(--deep)}.mobile-nav{display:none;height:62px;align-items:center;justify-content:space-between;padding:0 16px}.mobile-brand{font-size:15px}.mobile-brand .logo-slot{width:30px;height:30px;border-radius:10px}.site-main{min-height:60vh}
.page-hero{padding:64px 0 34px;background:linear-gradient(180deg,#f7fbff 0,#fff 100%)}.page-hero .kicker,.section-kicker{font-size:14px;font-weight:800;letter-spacing:.08em;color:var(--brand)}.page-hero h1{margin:8px 0 14px;color:var(--ink);font-size:clamp(36px,4vw,46px);line-height:1.16;letter-spacing:-.02em}.page-hero p{max-width:820px;margin:0;color:var(--muted);font-size:17px}
.hero-banner{width:min(1320px,calc(100% - 48px));margin:28px auto 0;aspect-ratio:16/7;max-height:520px;border-radius:30px;overflow:hidden;background:linear-gradient(135deg,#e8f3ff 0%,#fff 42%,#cfe5ff 100%);box-shadow:var(--brandshadow);position:relative}.hero-banner img{width:100%;height:100%;object-fit:contain}.hero-banner:after{content:"";position:absolute;inset:0;box-shadow:inset 0 0 0 1px var(--line);border-radius:inherit;pointer-events:none}.hero-intro{position:absolute;left:34px;bottom:30px;width:min(500px,calc(100% - 68px));padding:20px 22px;background:rgba(7,29,55,.84);color:#fff;border-radius:18px;backdrop-filter:blur(8px)}.hero-intro strong{display:block;font-size:26px;line-height:1.25;margin-bottom:6px}.hero-intro span{color:#dceeff;font-size:15px}
.quick-grid{width:min(1200px,calc(100% - 48px));margin:22px auto 0;display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.quick-grid a{padding:18px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);display:flex;justify-content:space-between;gap:12px;align-items:center;color:var(--ink);font-weight:750}.quick-grid a span{color:var(--muted);font-size:13px;font-weight:500}
.section{padding:70px 0}.section.alt{background:var(--ice)}.section.blue{background:var(--pale)}.section.dark{background:var(--navy);color:#dceeff}.section.dark h2,.section.dark h3,.section.dark strong{color:#fff}.section.dark p{color:#dceeff}.section-head{display:flex;align-items:end;justify-content:space-between;gap:28px;margin-bottom:28px}.section-head h2{margin:5px 0 0;color:var(--ink);font-size:clamp(28px,3vw,34px);line-height:1.2}.section-head p{margin:0;max-width:620px;color:var(--muted)}
.content-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:22px}.card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:24px;box-shadow:var(--shadow)}.card h3{margin:0 0 8px;color:var(--ink);font-size:21px;line-height:1.35}.card p{margin:0;color:var(--muted)}.card .eyebrow{display:block;color:var(--brand);font-size:13px;font-weight:800;margin-bottom:8px}.feature-card{grid-column:span 6;min-height:280px;display:flex;flex-direction:column;justify-content:flex-end;background:linear-gradient(145deg,#0a315e,#1677ee);color:#fff}.feature-card h3{color:#fff;font-size:28px}.feature-card p{color:#dceeff}.medium-card{grid-column:span 3;min-height:200px}.short-card{grid-column:span 4}
.split-feature{display:grid;grid-template-columns:55% 45%;align-items:stretch;border:1px solid var(--line);border-radius:28px;overflow:hidden;background:#fff;box-shadow:var(--shadow)}.city-feature-image,.app-preview-image,.app-standalone-image{min-height:400px;background:linear-gradient(145deg,#d9ecff,#f7fbff);position:relative;overflow:hidden}.city-feature-image img{width:100%;height:100%;object-fit:cover}.app-preview-image img,.app-standalone-image img{width:100%;height:100%;object-fit:contain}.split-copy{padding:40px}.split-copy h2{font-size:32px;color:var(--ink);margin:0 0 14px}.split-copy p{color:var(--muted)}.text-link{display:inline-flex;margin-top:16px;color:var(--deep);font-weight:800;min-height:44px;align-items:center}
.timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.timeline article{padding:24px;border-radius:20px;background:#fff;border:1px solid var(--line)}.timeline time{display:block;color:var(--brand);font-weight:800;font-size:14px}.timeline h3{color:var(--ink);margin:8px 0}.timeline p{margin:0;color:var(--muted)}
.route{display:grid;grid-template-columns:repeat(6,1fr);gap:12px}.route article{position:relative;padding:54px 18px 20px;border-radius:18px;background:#fff;border:1px solid var(--line)}.route article:before{content:attr(data-step);position:absolute;top:16px;left:18px;width:28px;height:28px;border-radius:50%;background:var(--pale);color:var(--deep);display:flex;align-items:center;justify-content:center;font-weight:800}.route h3{margin:0 0 6px;color:var(--ink);font-size:18px}.route p{margin:0;font-size:14px;color:var(--muted)}
.interest-wall{display:flex;flex-wrap:wrap;gap:12px}.interest-wall a{padding:12px 16px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:16px;color:#33455d}.qa-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.qa-item{padding:26px;border-radius:22px;background:#fff;border:1px solid var(--line)}.qa-item h3{margin:0 0 10px;color:var(--ink);font-size:21px}.qa-item p{margin:0;color:var(--muted)}
.editorial-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:20px}.editorial-grid article{padding:28px;border-radius:24px;background:#fff;border:1px solid var(--line)}.editorial-grid article:first-child{grid-row:span 2;background:linear-gradient(160deg,#fff,#edf5ff)}.editorial-grid h3{color:var(--ink);font-size:22px;margin:0 0 10px}.editorial-grid p{margin:0;color:var(--muted)}
.story-main{display:grid;grid-template-columns:1.1fr .9fr;gap:22px}.story-main article,.story-list article{background:#fff;border:1px solid var(--line);border-radius:24px;padding:30px}.story-main h3{font-size:28px;color:var(--ink);margin:0 0 12px}.story-main p,.story-list p{color:var(--muted)}.story-list{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:18px}
.topic-list{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.topic-list a{padding:24px;border:1px solid var(--line);border-radius:20px;background:#fff;display:block}.topic-list strong{display:block;color:var(--ink);font-size:20px;margin-bottom:6px}.topic-list span{color:var(--muted)}
.guide-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.guide-grid article{padding:26px;border-radius:22px;background:#fff;border:1px solid var(--line)}.guide-grid h3{margin:0 0 8px;color:var(--ink)}.guide-grid p{margin:0;color:var(--muted)}
.album-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:14px}.media-slot{border-radius:24px;overflow:hidden;background:linear-gradient(145deg,#deefff,#fff);border:1px solid var(--line);position:relative}.media-slot.wide{grid-column:span 12;aspect-ratio:16/7}.media-slot.medium{grid-column:span 6;aspect-ratio:4/3}.media-slot.small{grid-column:span 4;aspect-ratio:4/3}.media-slot .caption{position:absolute;left:18px;right:18px;bottom:18px;background:rgba(7,29,55,.82);color:#fff;border-radius:14px;padding:12px 14px}.media-slot .caption span{display:block;color:#dceeff;font-size:13px}
.pulse-list{display:grid;gap:12px}.pulse-item{display:grid;grid-template-columns:170px 1fr;gap:22px;padding:18px 20px;border-radius:16px;background:#fff;border:1px solid var(--line)}.pulse-item strong{color:var(--ink)}.pulse-item p{margin:0;color:var(--muted)}.principles{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.principles article{padding:24px;background:#fff;border:1px solid var(--line);border-radius:20px}.principles h3{margin:0 0 8px;color:var(--ink)}.principles p{margin:0;color:var(--muted)}
.safety-grid,.privacy-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.safety-grid article,.privacy-grid article{padding:24px;border-radius:20px;border:1px solid var(--line);background:#fff}.dark .safety-grid article{background:rgba(255,255,255,.06);border-color:var(--darkline)}.dark .safety-grid p{color:#dceeff}.safety-grid h3,.privacy-grid h3{margin:0 0 8px}.privacy-grid p{color:var(--muted);margin:0}
.article-shell{width:min(820px,calc(100% - 48px));margin:0 auto}.article-shell h2{color:var(--ink);font-size:30px;line-height:1.3;margin:42px 0 12px}.article-shell h3{color:var(--ink);font-size:22px;margin:28px 0 8px}.article-shell p{font-size:16px;color:var(--text);margin:0 0 18px}.article-wide{width:min(1120px,calc(100% - 48px));margin:0 auto}.index-wall{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}.index-wall article{padding:22px;border-radius:20px;background:#fff;border:1px solid var(--line)}.index-wall h3{margin:0 0 6px;color:var(--ink);font-size:19px}.index-wall p{margin:0;color:var(--muted);font-size:14px}.faq details{background:#fff;border:1px solid var(--line);border-radius:18px;padding:0 20px;margin:12px 0}.faq summary{cursor:pointer;padding:18px 0;font-weight:800;color:var(--ink)}.faq details p{padding:0 0 20px;margin:0;color:var(--muted)}.notice{padding:20px 22px;border-radius:18px;background:var(--pale);border:1px solid var(--line);color:#30445c}.brand-icon-slot{width:76px;height:76px;border-radius:22px;background:linear-gradient(145deg,#edf5ff,#d4e8ff);display:flex;align-items:center;justify-content:center;overflow:hidden}.brand-icon-slot img{width:100%;height:100%;object-fit:contain}.app-layout{display:grid;grid-template-columns:55% 45%;align-items:center;gap:28px}.app-copy h2{font-size:34px;color:var(--ink)}.app-preview-image{max-height:520px;border-radius:28px;border:1px solid var(--line)}
.mega-menu,.search-panel{position:fixed;z-index:80;background:#fff;box-shadow:0 24px 70px rgba(7,29,55,.2);visibility:hidden;pointer-events:none;opacity:0;transition:opacity .18s ease,transform .18s ease}.mega-menu{left:50%;top:86px;transform:translate(-50%,-10px);width:min(1180px,calc(100% - 40px));border-radius:28px;padding:28px}.mega-menu.open{visibility:visible;pointer-events:auto;opacity:1;transform:translate(-50%,0)}.mega-head{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:24px}.mega-brand{display:flex;align-items:center;gap:14px}.logo-slot.large{width:48px;height:48px}.mega-brand strong{display:block;color:var(--ink);font-size:20px}.mega-brand span{display:block;color:var(--soft);font-size:12px;letter-spacing:.12em}.close-button{min-height:44px;padding:0 16px;border-radius:12px;background:var(--pale)}.mega-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:20px}.mega-grid h2{font-size:14px;color:var(--brand);margin:0 0 10px}.mega-grid a{display:flex;min-height:40px;align-items:center;color:#3d4e64}
.search-panel{right:22px;top:86px;width:min(500px,calc(100% - 44px));border-radius:24px;padding:24px;transform:translateY(-8px)}.search-panel.open{visibility:visible;pointer-events:auto;opacity:1;transform:none}.search-head{display:flex;justify-content:space-between;gap:18px;align-items:flex-start}.search-head strong{display:block;color:var(--ink);font-size:20px}.search-head span{display:block;color:var(--muted);font-size:14px}.search-form{margin-top:20px}.search-form label{display:block;font-weight:700;color:var(--ink);margin-bottom:8px}.search-row{display:flex;gap:8px}.search-row input{min-width:0;flex:1;border:1px solid var(--line);border-radius:13px;padding:12px 14px;color:var(--ink)}.search-row button{border:0;border-radius:13px;padding:0 18px;background:linear-gradient(135deg,#3998FF 0%,#1677EE 55%,#075FC6 100%);color:#fff}.search-links{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}.search-links a{padding:8px 11px;border-radius:999px;background:var(--pale);color:var(--deep);font-size:13px}
.overlay{position:fixed;z-index:70;inset:0;background:rgba(7,29,55,.46);opacity:0;visibility:hidden;pointer-events:none;transition:opacity .18s ease}.overlay.open{opacity:1;visibility:visible;pointer-events:auto}.mobile-bottom-nav{display:none}.site-footer{background:var(--footer);color:#dceeff;border-top:1px solid rgba(220,238,255,.2);padding:54px 0 24px}.footer-inner{display:grid;grid-template-columns:1.25fr 2fr;gap:70px}.footer-brand{max-width:430px}.footer-logo{width:44px;height:44px;margin-bottom:14px}.footer-brand strong{display:block;color:#fff;font-size:22px}.footer-brand span{font-size:12px;letter-spacing:.12em}.footer-brand p{color:#dceeff;font-size:14px}.footer-links{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}.footer-links h2{font-size:14px;color:#fff;margin:0 0 12px}.footer-links a{display:block;color:#dceeff;font-size:14px;padding:5px 0}.footer-bottom{border-top:1px solid var(--darkline);margin-top:38px;padding-top:20px;display:flex;justify-content:space-between;gap:20px;color:#bcd3ea;font-size:13px}.footer-bottom div{display:flex;gap:16px}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid rgba(51,149,255,.42);outline-offset:3px}
@media(max-width:1279px){.desktop-nav{gap:12px}.primary-nav a,.nav-tools a,.nav-tools button{padding:0 8px;font-size:14px}.shell{width:min(1180px,calc(100% - 36px))}.route{grid-template-columns:repeat(3,1fr)}.index-wall{grid-template-columns:repeat(4,1fr)}}
@media(max-width:1023px){.desktop-nav{display:none}.mobile-nav{display:flex}.quick-grid{grid-template-columns:repeat(2,1fr)}.content-grid{grid-template-columns:repeat(6,1fr)}.feature-card{grid-column:span 6}.medium-card,.short-card{grid-column:span 3}.split-feature,.app-layout{grid-template-columns:1fr}.city-feature-image{min-height:320px}.editorial-grid{grid-template-columns:1fr 1fr}.editorial-grid article:first-child{grid-row:auto;grid-column:1/-1}.principles{grid-template-columns:repeat(2,1fr)}.index-wall{grid-template-columns:repeat(3,1fr)}.mega-menu{top:0;left:0;width:100%;height:100dvh;border-radius:0;transform:translateY(-8px);padding:24px;overflow:auto}.mega-menu.open{transform:none}.mega-grid{grid-template-columns:repeat(2,1fr)}.footer-inner{grid-template-columns:1fr;gap:36px}}
@media(max-width:767px){.shell,.article-shell,.article-wide{width:calc(100% - 28px)}.page-hero{padding:42px 0 24px}.page-hero h1{font-size:clamp(28px,9vw,34px)}.page-hero p{font-size:15px}.hero-banner{width:calc(100% - 28px);aspect-ratio:16/10;border-radius:22px;margin-top:16px}.hero-intro{left:14px;right:14px;bottom:14px;width:auto;padding:14px 16px}.hero-intro strong{font-size:21px}.hero-intro span{font-size:13px}.quick-grid{width:calc(100% - 28px);grid-template-columns:1fr 1fr;gap:10px}.quick-grid a{padding:14px;font-size:14px}.section{padding:48px 0}.section-head{display:block;margin-bottom:20px}.section-head h2{font-size:26px}.section-head p{margin-top:8px;font-size:14px}.content-grid{display:block}.feature-card,.medium-card,.short-card{margin-bottom:14px;min-height:0}.feature-card{padding-top:80px}.feature-card h3{font-size:23px}.split-copy{padding:26px}.split-copy h2{font-size:26px}.timeline{grid-template-columns:1fr 1fr}.route{grid-template-columns:1fr 1fr}.qa-grid,.topic-list,.story-main,.story-list{grid-template-columns:1fr}.editorial-grid,.guide-grid,.safety-grid,.privacy-grid{grid-template-columns:1fr}.media-slot.wide,.media-slot.medium,.media-slot.small{grid-column:span 12}.media-slot.wide{aspect-ratio:16/10}.pulse-item{grid-template-columns:1fr;gap:4px}.principles{grid-template-columns:1fr 1fr}.index-wall{grid-template-columns:1fr 1fr}.footer-links{grid-template-columns:1fr 1fr}.footer-bottom{display:block;padding-bottom:78px}.footer-bottom div{margin-top:8px;flex-wrap:wrap}.mobile-bottom-nav{position:fixed;z-index:45;left:0;right:0;bottom: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-nav a{min-height:54px;display:flex;align-items:center;justify-content:center;font-size:13px;color:#526176}}
@media(max-width:559px){.quick-grid{grid-template-columns:1fr}.timeline,.route,.principles,.index-wall{grid-template-columns:1fr}.section-head h2{font-size:24px}.card h3{font-size:19px}.article-shell h2{font-size:25px}.mega-grid{grid-template-columns:1fr}.mega-menu{padding:18px}.search-panel{top:72px;right:12px;width:calc(100% - 24px)}.footer-links{grid-template-columns:1fr 1fr;gap:18px}.mobile-brand span:last-child{display:none}}