:root{--blue:#1677EE;--bright:#3395FF;--deep:#075FC6;--navy:#0A315E;--footer:#071D37;--ink:#16243A;--body:#3C485A;--muted:#6B7787;--soft:#929BA8;--ice:#F7FAFF;--pale:#EDF5FF;--softblue:#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;color:var(--body);background:#fff;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;line-height:1.75;overflow-x:hidden}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}button,input{font:inherit}.wrap{width:min(1320px,calc(100% - 40px));margin-inline:auto}.site-header{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.96);backdrop-filter:blur(14px);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);white-space:nowrap}.brand-logo-slot{width:38px;height:38px;border-radius:12px;background:linear-gradient(145deg,var(--softblue),#fff);display:grid;place-items:center;overflow:hidden;border:1px solid var(--line);flex:0 0 auto}.brand-logo-slot img{width:100%;height:100%;object-fit:contain}.brand-logo-slot.small{width:32px;height:32px;border-radius:10px}.primary-nav{display:flex;align-items:center;justify-content:center;min-width:0;gap:2px;white-space:nowrap}.primary-nav a,.text-action,.icon-button{min-height:44px;display:inline-flex;align-items:center;justify-content:center;border-radius:14px;padding:0 12px;font-size:15px;color:#35445a}.primary-nav a.active,.text-action.active{background:var(--pale);color:var(--deep);font-weight:700}.primary-nav a.active span:before{content:"";display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--blue);margin-right:6px;vertical-align:2px}.header-actions{display:flex;align-items:center;gap:4px}.icon-button{border:1px solid var(--line);background:#fff;cursor:pointer}.icon-button:hover,.icon-button:focus-visible,.primary-nav a:hover,.text-action:hover{background:var(--pale);outline:none;color:var(--deep)}.mobile-nav{height:62px;padding:0 16px;display:none;grid-template-columns:70px 1fr 70px;align-items:center}.mobile-nav .mobile-brand{justify-self:center}.mobile-nav>.icon-button:first-child{justify-self:start}.mobile-nav>.icon-button:last-child{justify-self:end}
.page-hero{padding:70px 0 44px;background:linear-gradient(180deg,#fff 0%,var(--ice) 100%)}.page-hero .eyebrow,.section-kicker{font-size:14px;color:var(--deep);font-weight:800;letter-spacing:.08em}.page-hero h1{margin:8px 0 14px;font-size:clamp(34px,4vw,46px);line-height:1.18;color:var(--ink);max-width:900px}.page-hero p{margin:0;max-width:820px;font-size:17px;color:var(--muted)}.hero-banner{aspect-ratio:16/7;max-height:520px;margin-top:28px;border-radius:28px;overflow:hidden;background:linear-gradient(135deg,#dcecff,#ffffff 50%,#d7ebff);border:1px solid var(--line);box-shadow:var(--brandshadow);position:relative}.hero-banner img{width:100%;height:100%;object-fit:contain}.hero-banner-copy{position:absolute;left:34px;bottom:34px;max-width:520px;background:rgba(10,49,94,.84);color:#fff;border-radius:20px;padding:20px 22px}.hero-banner-copy h2{margin:0 0 6px;font-size:28px;line-height:1.25}.hero-banner-copy p{margin:0;color:#dceeff;font-size:15px}.quick-nav{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:18px}.quick-nav a{padding:18px 20px;border:1px solid var(--line);border-radius:18px;background:#fff;box-shadow:var(--shadow)}.quick-nav strong{display:block;color:var(--ink);font-size:18px}.quick-nav span{display:block;color:var(--muted);font-size:14px;margin-top:2px}
.section{padding:64px 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-head{display:flex;justify-content:space-between;gap:30px;align-items:end;margin-bottom:26px}.section-head h2{margin:4px 0 0;color:var(--ink);font-size:clamp(26px,3vw,34px);line-height:1.25}.section-head p{max-width:650px;margin:0;color:var(--muted)}.section.dark .section-head p{color:#dceeff}.read-more{color:var(--deep);font-weight:700;white-space:nowrap}.editorial-grid{display:grid;grid-template-columns:1.45fr 1fr;gap:20px}.feature-card,.content-card,.note-card,.guide-card,.topic-card,.story-card,.principle-card,.help-card,.privacy-card{border:1px solid var(--line);border-radius:22px;background:#fff;box-shadow:var(--shadow);padding:24px}.feature-card{min-height:330px;display:flex;flex-direction:column;justify-content:flex-end;background:linear-gradient(155deg,#edf5ff,#fff)}.feature-card h3{font-size:30px;line-height:1.25;margin:6px 0 10px;color:var(--ink)}.feature-card p,.content-card p,.note-card p,.guide-card p,.topic-card p,.story-card p,.principle-card p,.help-card p,.privacy-card p{margin:0;color:var(--muted)}.stack{display:grid;gap:16px}.content-card h3,.note-card h3,.guide-card h3,.topic-card h3,.story-card h3,.principle-card h3,.help-card h3,.privacy-card h3{margin:0 0 8px;font-size:20px;color:var(--ink);line-height:1.35}.short-list{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:20px}.short-list article{border-top:2px solid var(--blue);padding:16px 6px 0}.short-list h3{font-size:17px;margin:0 0 6px;color:var(--ink)}.short-list p{font-size:14px;color:var(--muted);margin:0}
.split-feature{display:grid;grid-template-columns:1.2fr 1fr;gap:42px;align-items:center}.city-feature-image,.app-preview-image,.visual-slot{border-radius:26px;overflow:hidden;border:1px solid var(--line);background:linear-gradient(135deg,#d8eaff,#fff);min-height:340px}.city-feature-image{aspect-ratio:4/3}.city-feature-image img,.visual-slot img{width:100%;height:100%;object-fit:cover}.app-preview-image{min-height:420px;display:grid;place-items:center}.app-preview-image img{width:100%;height:100%;max-height:520px;object-fit:contain}.split-feature h2{font-size:32px;line-height:1.25;color:var(--ink);margin:6px 0 14px}.split-feature p{margin:0 0 14px}.pill-list{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.pill-list a,.pill-list span{padding:8px 13px;border-radius:999px;background:var(--pale);color:var(--deep);font-size:14px;border:1px solid var(--line)}
.time-board,.route-board,.interest-grid,.qa-grid,.culture-grid,.topic-grid,.guide-grid,.story-grid,.principles,.help-grid,.privacy-grid,.install-grid,.info-grid{display:grid;gap:18px}.time-board{grid-template-columns:repeat(4,1fr)}.time-board article{padding:24px;border-radius:22px;background:#fff;border:1px solid var(--line)}.time-board b{color:var(--deep);font-size:14px}.time-board h3{margin:8px 0 8px;color:var(--ink);font-size:20px}.time-board p{margin:0;color:var(--muted);font-size:15px}.route-board{grid-template-columns:repeat(6,1fr)}.route-step{position:relative;padding:22px 18px;border-radius:18px;background:#fff;border:1px solid var(--line)}.route-step small{color:var(--deep);font-weight:800}.route-step h3{font-size:18px;margin:6px 0;color:var(--ink)}.route-step p{font-size:14px;color:var(--muted);margin:0}.interest-grid{grid-template-columns:repeat(5,1fr)}.interest-grid a{min-height:120px;padding:20px;border-radius:18px;background:#fff;border:1px solid var(--line);display:flex;flex-direction:column;justify-content:flex-end}.interest-grid strong{font-size:17px;color:var(--ink)}.interest-grid span{font-size:14px;color:var(--muted)}.qa-grid{grid-template-columns:repeat(2,1fr)}.qa-grid article{padding:24px 0;border-bottom:1px solid var(--line)}.qa-grid h3{font-size:19px;color:var(--ink);margin:0 0 7px}.qa-grid p{margin:0;color:var(--muted)}.culture-grid{grid-template-columns:1.4fr 1fr 1fr}.culture-grid article{padding:26px;border-radius:22px;border:1px solid var(--line);background:#fff}.culture-grid h3{font-size:22px;color:var(--ink);margin:0 0 10px}.culture-grid p{margin:0;color:var(--muted)}.story-grid{grid-template-columns:1.5fr repeat(2,1fr)}.story-card.main{grid-row:span 2;background:linear-gradient(160deg,#fff,#edf5ff)}.story-card.main h3{font-size:28px}.topic-grid,.guide-grid,.principles,.help-grid,.privacy-grid,.install-grid,.info-grid{grid-template-columns:repeat(3,1fr)}.topic-card{min-height:200px}.guide-card{min-height:220px}.principle-card strong{display:block;color:var(--deep);margin-bottom:8px}.principle-card h3{font-size:21px}.info-strip{display:flex;gap:18px;align-items:flex-start;padding:18px 0;border-bottom:1px solid var(--line)}.info-strip b{color:var(--deep);min-width:86px}.info-strip p{margin:0;color:var(--muted)}
.album-layout{display:grid;grid-template-columns:2fr 1fr 1fr;grid-auto-rows:minmax(180px,1fr);gap:16px}.media-slot{border-radius:22px;border:1px solid var(--line);background:linear-gradient(145deg,#dbeeff,#fff);min-height:180px;overflow:hidden;position:relative}.media-slot.wide{grid-row:span 2;min-height:380px}.media-slot.medium{min-height:220px}.media-slot small{position:absolute;left:16px;bottom:14px;padding:6px 10px;border-radius:999px;background:rgba(10,49,94,.84);color:#fff}.article-shell{width:min(820px,calc(100% - 40px));margin:0 auto}.article-shell h2{font-size:28px;color:var(--ink);margin:42px 0 12px}.article-shell h3{font-size:21px;color:var(--ink);margin:28px 0 8px}.article-shell p{margin:0 0 16px}.article-shell ul{padding-left:22px}.article-shell li{margin:8px 0}.chapter-list{display:grid;gap:12px}.chapter-list article{padding:22px;border-left:4px solid var(--blue);background:var(--ice);border-radius:0 18px 18px 0}.chapter-list h2{margin:0 0 8px;font-size:22px}.chapter-list p{margin:0;color:var(--muted)}details{border:1px solid var(--line);border-radius:16px;padding:0 18px;background:#fff;margin:12px 0}summary{cursor:pointer;padding:18px 0;font-weight:700;color:var(--ink)}details p{margin:0 0 18px;color:var(--muted)}
.security-panel{background:var(--navy);color:#dceeff;border-radius:28px;padding:34px}.security-panel h2,.security-panel h3{color:#fff}.security-panel .info-grid article{border:1px solid rgba(255,255,255,.12);border-radius:18px;padding:20px;background:rgba(255,255,255,.04)}.security-panel p{color:#dceeff}.privacy-card{border-color:rgba(22,119,238,.18)}.app-icon-slot{width:86px;height:86px;border-radius:24px;background:var(--softblue);border:1px solid var(--line);overflow:hidden;margin-bottom:18px}.app-icon-slot img{width:100%;height:100%;object-fit:contain}.cta-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:20px}.btn{min-height:44px;padding:10px 18px;border-radius:14px;border:1px solid var(--line);display:inline-flex;align-items:center;font-weight:700}.btn.primary{color:#fff;background:linear-gradient(135deg,#3998FF 0%,#1677EE 55%,#075FC6 100%);border-color:transparent}.btn.secondary{background:#fff;color:var(--deep)}
.overlay{position:fixed;inset:0;z-index:70;background:rgba(7,29,55,.46)}.overlay[hidden]{display:none}.mega-panel,.search-panel{position:fixed;z-index:80;left:50%;top:86px;transform:translate(-50%,-14px);width:min(1180px,calc(100% - 32px));max-height:calc(100vh - 110px);overflow:auto;background:#fff;border:1px solid var(--line);border-radius:24px;box-shadow:0 26px 70px rgba(7,29,55,.22);padding:24px;opacity:0;visibility:hidden;pointer-events:none;transition:.18s ease}.mega-panel.open,.search-panel.open{opacity:1;visibility:visible;pointer-events:auto;transform:translate(-50%,0)}.panel-head{display:flex;align-items:center;justify-content:space-between;gap:18px;border-bottom:1px solid var(--line);padding-bottom:18px}.panel-head small{display:block;color:var(--muted)}.mega-brand{display:flex;align-items:center;gap:12px}.mega-brand strong{color:var(--ink);display:block}.mega-brand small{letter-spacing:.12em}.mega-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:18px;padding-top:22px}.mega-grid section{display:flex;flex-direction:column}.mega-grid h2{font-size:15px;color:var(--deep);margin:0 0 10px}.mega-grid a{padding:8px 0;color:var(--body)}.mega-grid a:hover{color:var(--blue)}.search-panel{max-width:760px}.search-form{padding:26px 0}.search-form label{display:block;color:var(--ink);font-weight:700;margin-bottom:8px}.search-row{display:grid;grid-template-columns:1fr auto;gap:10px}.search-row input{min-width:0;border:1px solid var(--line);border-radius:14px;padding:12px 14px;outline:none}.search-row input:focus{border-color:var(--blue)}.search-row button{border:0;border-radius:14px;padding:0 18px;background:var(--blue);color:#fff}.search-links{display:flex;gap:10px;flex-wrap:wrap}.search-links a{padding:9px 13px;border-radius:999px;background:var(--pale);color:var(--deep)}
.site-footer{background:var(--footer);color:#dceeff;border-top:1px solid rgba(220,238,255,.22);padding:54px 0 76px}.footer-grid{display:grid;grid-template-columns:2fr repeat(4,1fr);gap:34px}.footer-brand h2{margin:14px 0 8px;color:#fff;font-size:22px}.footer-brand h2 small{display:block;font-size:12px;letter-spacing:.16em;color:#dceeff}.footer-brand p{max-width:440px;margin:0;color:#dceeff}.footer-logo{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.12)}.footer-grid h3{color:#fff;margin:0 0 10px;font-size:15px}.footer-grid>div:not(.footer-brand){display:flex;flex-direction:column}.footer-grid a{padding:5px 0;color:#dceeff}.footer-grid a:hover{color:#fff}.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:34px;padding-top:18px;display:flex;justify-content:space-between;gap:20px;color:#dceeff;font-size:14px}.mobile-bottom{display:none}
@media(max-width:1279px){.desktop-nav{gap:12px}.primary-nav a,.text-action,.icon-button{padding-inline:9px}.wrap{width:min(100% - 32px,1180px)}.route-board{grid-template-columns:repeat(3,1fr)}.interest-grid{grid-template-columns:repeat(5,1fr)}}
@media(max-width:1023px){.desktop-nav{display:none}.mobile-nav{display:grid}.page-hero{padding-top:46px}.quick-nav{grid-template-columns:repeat(2,1fr)}.editorial-grid,.split-feature{grid-template-columns:1fr}.time-board,.topic-grid,.guide-grid,.principles,.help-grid,.privacy-grid,.install-grid,.info-grid{grid-template-columns:repeat(2,1fr)}.culture-grid{grid-template-columns:1fr 1fr}.culture-grid article:first-child{grid-column:1/-1}.story-grid{grid-template-columns:1fr 1fr}.story-card.main{grid-column:1/-1;grid-row:auto}.album-layout{grid-template-columns:1fr 1fr}.media-slot.wide{grid-column:1/-1;grid-row:auto}.mega-grid{grid-template-columns:repeat(3,1fr)}.footer-grid{grid-template-columns:2fr 1fr 1fr}.footer-grid>div:nth-child(4),.footer-grid>div:nth-child(5){margin-top:10px}}
@media(max-width:767px){body{padding-bottom:58px}.wrap{width:min(100% - 28px,680px)}.page-hero{padding:34px 0 30px}.page-hero h1{font-size:clamp(28px,8vw,34px)}.page-hero p{font-size:16px}.hero-banner{aspect-ratio:16/10;border-radius:20px}.hero-banner-copy{left:16px;right:16px;bottom:16px;padding:15px 16px}.hero-banner-copy h2{font-size:22px}.quick-nav{grid-template-columns:1fr 1fr;gap:10px}.quick-nav a{padding:14px}.section{padding:46px 0}.section-head{display:block}.section-head h2{font-size:26px}.section-head .read-more{display:inline-block;margin-top:10px}.short-list,.time-board,.route-board,.interest-grid,.qa-grid,.culture-grid,.topic-grid,.guide-grid,.principles,.help-grid,.privacy-grid,.install-grid,.info-grid{grid-template-columns:1fr}.interest-grid{grid-template-columns:1fr 1fr}.story-grid{grid-template-columns:1fr}.split-feature{gap:26px}.city-feature-image{min-height:240px}.app-preview-image{min-height:320px}.album-layout{grid-template-columns:1fr}.media-slot.wide{min-height:260px}.media-slot.medium{min-height:190px}.mega-panel,.search-panel{top:0;left:0;transform:none!important;width:100%;height:100%;max-height:none;border-radius:0;border:0;padding:18px;overflow:auto}.mega-grid{grid-template-columns:1fr 1fr}.search-row{grid-template-columns:1fr}.search-row button{min-height:46px}.footer-grid{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}.footer-bottom{flex-direction:column}.mobile-bottom{position:fixed;z-index:50;left:0;right:0;bottom:0;display:grid;grid-template-columns:repeat(5,1fr);height:58px;padding-bottom:env(safe-area-inset-bottom);background:rgba(255,255,255,.97);border-top:1px solid var(--line)}.mobile-bottom a{display:grid;place-items:center;min-width:44px;color:#3b4b61;font-size:13px}.mobile-bottom a:focus-visible{outline:2px solid var(--blue);outline-offset:-2px}.site-footer{padding-bottom:40px}}
@media(max-width:559px){.mobile-nav{grid-template-columns:64px 1fr 64px}.mobile-brand span:last-child{font-size:15px}.quick-nav{grid-template-columns:1fr}.interest-grid{grid-template-columns:1fr 1fr}.feature-card h3{font-size:25px}.feature-card{min-height:280px}.section-head h2,.split-feature h2{font-size:24px}.mega-grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr}.footer-brand{grid-column:auto}.hero-banner-copy p{display:none}}