:root{--brand:#1677EE;--bright:#3395FF;--deep:#0A315E;--deep2:#071D37;--ink:#16243A;--text:#3C485A;--muted:#6B7787;--soft:#F7FAFF;--pale:#EDF5FF;--pale2:#E5F1FF;--line:rgba(22,119,238,.12);--shadow:0 12px 34px rgba(30,72,120,.08);--brand-shadow:0 14px 40px rgba(22,119,238,.14);--radius:24px;}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--text);background:#fff;font-family:"Microsoft YaHei","PingFang SC","Noto Sans SC",Arial,sans-serif;line-height:1.75;overflow-x:hidden}a{color:inherit;text-decoration:none}img{display:block;max-width:100%}button,input{font:inherit}.shell{width:min(1320px,calc(100% - 48px));margin:auto}.skip-link{position:fixed;left:12px;top:-60px;z-index:200;background:#fff;color:var(--deep);padding:10px 14px;border-radius:10px;box-shadow:var(--shadow)}.skip-link:focus{top:12px}.site-header{position:sticky;top:0;z-index:80;background:rgba(255,255,255,.96);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}.desktop-nav{height:74px;display:flex;align-items:center;gap:26px}.brand{display:flex;align-items:center;gap:10px;min-width:max-content}.brand-mark{width:40px;height:40px;border-radius:13px;background:linear-gradient(145deg,#fff,var(--pale));border:1px solid var(--line);display:grid;place-items:center;overflow:hidden}.brand-mark img{width:34px;height:34px;object-fit:contain}.brand-copy{display:flex;flex-direction:column;line-height:1.15}.brand-copy strong{font-size:18px;color:var(--ink)}.brand-copy small{font-size:10px;letter-spacing:.16em;color:var(--brand)}.main-nav{display:flex;align-items:center;gap:4px;flex:1;white-space:nowrap}.main-nav a,.utility-nav a,.icon-button{min-height:44px;padding:0 13px;display:inline-flex;align-items:center;justify-content:center;border-radius:13px;color:#45566d;font-size:15px}.main-nav a:hover,.main-nav a:focus-visible,.utility-nav a:hover,.utility-nav a:focus-visible,.icon-button:hover,.icon-button:focus-visible{background:var(--pale);color:var(--brand);outline:none}.main-nav a.active{background:var(--pale);color:var(--brand);font-weight:700}.main-nav a.active:before{content:"";width:6px;height:6px;border-radius:50%;background:var(--brand);margin-right:7px}.utility-nav{display:flex;align-items:center;gap:2px}.icon-button{border:0;background:transparent;cursor:pointer}.app-link{background:linear-gradient(135deg,#3998FF,#1677EE 55%,#075FC6)!important;color:#fff!important}.mobile-nav{display:none;height:62px;padding:0 16px;align-items:center;justify-content:space-between}.mobile-action{min-width:48px;min-height:44px;border:0;background:var(--pale);border-radius:12px;color:var(--deep);font-weight:700}.mobile-logo{display:flex;align-items:center;gap:8px;color:var(--ink);font-weight:800}.mobile-logo img{max-height:32px;max-width:32px;object-fit:contain}
main{min-height:60vh}.hero-banner{width:min(1320px,calc(100% - 48px));margin:28px auto 0;aspect-ratio:16/7;max-height:520px;border-radius:32px;overflow:hidden;position:relative;background:linear-gradient(135deg,#dff0ff 0%,#e9f6ff 48%,#cfe6ff 100%);box-shadow:var(--brand-shadow)}.hero-banner img{width:100%;height:100%;object-fit:contain}.hero-info{position:absolute;left:34px;bottom:34px;max-width:520px;padding:22px 24px;border-radius:20px;background:rgba(7,29,55,.82);color:#fff}.hero-info span{color:#DCEEFF;font-size:14px}.hero-info h1{margin:5px 0 8px;font-size:clamp(42px,4vw,56px);line-height:1.12}.hero-info p{margin:0;color:#e9f4ff}.portal-four{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:22px auto 0}.portal-four a{min-height:112px;padding:20px;border:1px solid var(--line);border-radius:22px;background:#fff;box-shadow:var(--shadow);display:flex;flex-direction:column;justify-content:space-between}.portal-four strong{font-size:20px;color:var(--ink)}.portal-four span{font-size:14px;color:var(--muted)}.portal-four a:hover{transform:translateY(-2px);box-shadow:var(--brand-shadow)}
.section{padding:74px 0}.section.soft{background:var(--soft)}.section.pale{background:var(--pale)}.section.deep{background:var(--deep);color:#DCEEFF}.section-head{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:28px}.eyebrow{color:var(--brand);font-weight:800;font-size:13px;letter-spacing:.1em}.section.deep .eyebrow{color:#9fd0ff}.section h2,.page-intro h1{color:var(--ink);margin:0}.section.deep h2,.section.deep h3{color:#fff}.section-head h2{font-size:clamp(28px,3vw,34px);line-height:1.25}.section-head p{max-width:620px;margin:0;color:var(--muted)}.section.deep .section-head p,.section.deep p{color:#DCEEFF}.editor-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;grid-template-rows:auto auto;gap:18px}.story-card{padding:24px;border-radius:24px;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow)}.story-card.large{grid-row:span 2;min-height:330px;background:linear-gradient(155deg,#fff,#edf6ff)}.story-card h3{margin:0 0 10px;color:var(--ink);font-size:22px}.story-card p{margin:0;color:var(--text)}.feature-split{display:grid;grid-template-columns:55fr 45fr;gap:34px;align-items:center}.city-feature-image,.app-preview-image,.media-slot,.image-slot{overflow:hidden;border-radius:28px;background:linear-gradient(135deg,#d9edff,#fff);border:1px solid var(--line);min-height:280px}.city-feature-image img,.app-preview-image img,.image-slot img{width:100%;height:100%;object-fit:cover}.city-feature-image{aspect-ratio:4/3}.app-preview-image{min-height:400px;display:grid;place-items:center}.app-preview-image img{max-height:520px;object-fit:contain}.copy-block h2{font-size:32px;line-height:1.25;margin:0 0 16px;color:var(--ink)}.copy-block p{margin:0 0 16px}.text-link{display:inline-flex;min-height:44px;align-items:center;padding:0 16px;border-radius:13px;background:var(--pale);color:var(--brand);font-weight:700}.timeline-four,.route-six,.topic-grid,.guide-grid,.interest-grid,.principle-grid{display:grid;gap:16px}.timeline-four{grid-template-columns:repeat(4,1fr)}.route-six,.guide-grid,.principle-grid{grid-template-columns:repeat(3,1fr)}.topic-grid{grid-template-columns:repeat(2,1fr)}.interest-grid{grid-template-columns:repeat(5,1fr)}.tile{padding:22px;border-radius:22px;background:#fff;border:1px solid var(--line)}.tile h3{margin:0 0 8px;font-size:20px;color:var(--ink)}.tile p{margin:0;font-size:15px}.section.deep .tile{background:rgba(255,255,255,.07);border-color:rgba(255,255,255,.12)}.section.deep .tile h3{color:#fff}.interest-pill{min-height:104px;border-radius:20px;padding:18px;background:#fff;border:1px solid var(--line);display:flex;flex-direction:column;justify-content:space-between}.interest-pill strong{color:var(--ink);font-size:17px}.interest-pill span{font-size:13px;color:var(--muted)}.essay-list{display:grid;gap:16px}.essay-item{padding:24px;border-left:4px solid var(--brand);background:#fff;border-radius:0 20px 20px 0;box-shadow:var(--shadow)}.essay-item h3{margin:0 0 8px;color:var(--ink);font-size:21px}.essay-item p{margin:0}.album-grid{display:grid;grid-template-columns:2fr 1fr 1fr;grid-template-rows:230px 180px;gap:14px}.media-slot{min-height:unset}.media-slot.wide{grid-row:span 2}.media-slot:nth-child(4){grid-column:2}.media-slot:nth-child(5){grid-column:3}.media-slot:nth-child(6){grid-column:2 / span 2}.pulse-list{display:grid;gap:10px}.pulse-row{display:grid;grid-template-columns:140px 1fr;gap:20px;padding:17px 0;border-bottom:1px solid var(--line)}.pulse-row strong{color:var(--brand)}.page-intro{padding:68px 0 38px}.page-intro .intro-wrap{width:min(1040px,calc(100% - 48px));margin:auto;padding:44px;border-radius:30px;background:linear-gradient(135deg,var(--pale),#fff);border:1px solid var(--line)}.page-intro h1{font-size:clamp(36px,4vw,46px);line-height:1.15}.page-intro p{max-width:800px;margin:16px 0 0;font-size:17px}.content-wrap{width:min(1180px,calc(100% - 48px));margin:auto}.article-narrow{width:min(820px,100%);margin:auto}.lead{font-size:18px;color:#314159}.article-section{margin:0 0 38px}.article-section h2{font-size:28px;margin:0 0 14px;color:var(--ink)}.article-section h3{font-size:21px;margin:20px 0 8px;color:var(--ink)}.article-section p{margin:0 0 15px}.callout{padding:22px 24px;border-radius:20px;background:var(--pale);border:1px solid var(--line);margin:24px 0}.faq-list{display:grid;gap:12px}.faq-list details{background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px 20px}.faq-list summary{cursor:pointer;color:var(--ink);font-weight:800;min-height:36px}.faq-list p{margin:12px 0 0}.feedback-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.info-card{padding:26px;border:1px solid var(--line);border-radius:24px;background:#fff}.info-card h2{font-size:24px;margin:0 0 10px;color:var(--ink)}
.overlay{position:fixed;inset:0;background:rgba(7,29,55,.42);z-index:98;opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.overlay.show{opacity:1;visibility:visible;pointer-events:auto}.mega-panel,.search-panel{position:fixed;z-index:100;visibility:hidden;pointer-events:none;opacity:0;transition:.2s}.mega-panel{left:0;right:0;top:0;background:#fff;transform:translateY(-18px);box-shadow:0 30px 70px rgba(7,29,55,.18)}.mega-panel.open,.search-panel.open{visibility:visible;pointer-events:auto;opacity:1;transform:none}.panel-head{height:80px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.panel-head button,.search-head button{min-height:44px;padding:0 16px;border:0;border-radius:13px;background:var(--pale);color:var(--deep);cursor:pointer}.menu-brand{display:flex;align-items:center;gap:12px}.menu-brand img{width:42px;height:42px;object-fit:contain}.menu-brand div{display:flex;flex-direction:column}.menu-brand span{font-size:11px;color:var(--brand);letter-spacing:.14em}.mega-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:26px;padding-top:34px;padding-bottom:42px}.mega-grid h2{font-size:16px;color:var(--ink);margin:0 0 10px}.mega-grid a{display:flex;min-height:38px;align-items:center;color:var(--muted)}.mega-grid a:hover{color:var(--brand)}.search-panel{inset:0;display:grid;place-items:start center;padding-top:11vh;transform:translateY(-12px)}.search-card{width:min(720px,calc(100% - 32px));background:#fff;border-radius:26px;padding:28px;box-shadow:0 30px 70px rgba(7,29,55,.22)}.search-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px}.search-head strong{font-size:23px;color:var(--ink)}.search-card label{display:block;color:var(--muted);font-size:14px;margin-bottom:8px}.search-row{display:flex;gap:10px}.search-row input{flex:1;min-height:48px;border:1px solid var(--line);border-radius:14px;padding:0 14px;color:var(--ink);outline:none}.search-row input:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(22,119,238,.1)}.search-row button{min-height:48px;border:0;border-radius:14px;padding:0 18px;color:#fff;background:linear-gradient(135deg,#3998FF,#1677EE 55%,#075FC6);cursor:pointer}.search-links{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}.search-links a{padding:8px 12px;border-radius:999px;background:var(--soft);color:var(--brand);font-size:14px}.panel-open{overflow:hidden}.mobile-bottom{display:none}
.site-footer{background:var(--deep2);color:#DCEEFF;border-top:1px solid rgba(190,225,255,.35);padding:58px 0 28px}.footer-grid{display:grid;grid-template-columns:2fr repeat(4,1fr);gap:34px}.footer-brand{padding-right:28px}.footer-logo{width:52px;height:52px;border-radius:16px;background:rgba(255,255,255,.08);display:grid;place-items:center;margin-bottom:14px}.footer-logo img{width:44px;height:44px;object-fit:contain}.footer-brand strong{color:#fff;font-size:20px}.footer-brand strong span{font-size:11px;color:#9fd0ff;letter-spacing:.12em}.footer-brand p{color:#DCEEFF;font-size:14px}.footer-grid h2{font-size:15px;color:#fff;margin:0 0 10px}.footer-grid a{display:block;min-height:34px;color:#DCEEFF;font-size:14px}.footer-grid a:hover{color:#fff}.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:34px;padding-top:22px;display:flex;justify-content:space-between;gap:16px;color:#aac9e7;font-size:13px}.footer-bottom a{color:#DCEEFF}
@media (max-width:1100px){.main-nav{gap:0}.main-nav a,.utility-nav a,.icon-button{padding:0 9px;font-size:14px}.brand-copy small{display:none}.editor-grid{grid-template-columns:1fr 1fr}.story-card.large{grid-column:span 2;grid-row:auto}.interest-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:8px}.mega-grid{grid-template-columns:repeat(3,1fr)}}
@media (max-width:820px){.desktop-nav{display:none}.mobile-nav{display:flex}.shell,.content-wrap{width:min(100% - 32px,1320px)}.hero-banner{width:calc(100% - 32px);margin-top:16px;aspect-ratio:16/10;border-radius:24px}.hero-info{left:16px;right:16px;bottom:16px;max-width:none;padding:18px}.hero-info h1{font-size:34px}.portal-four{grid-template-columns:1fr 1fr}.section{padding:54px 0}.section-head{align-items:flex-start;flex-direction:column}.feature-split{grid-template-columns:1fr}.feature-split .city-feature-image,.feature-split .app-preview-image{order:-1}.timeline-four,.route-six,.guide-grid,.principle-grid,.topic-grid{grid-template-columns:1fr 1fr}.interest-grid{grid-template-columns:repeat(2,1fr)}.page-intro{padding:28px 0 22px}.page-intro .intro-wrap{width:calc(100% - 32px);padding:30px 24px;border-radius:24px}.page-intro h1{font-size:32px}.feedback-grid{grid-template-columns:1fr}.mega-panel{top:0;bottom:0;overflow:auto}.panel-head{height:68px}.mega-grid{grid-template-columns:1fr 1fr;padding-bottom:90px}.mobile-bottom{position:fixed;z-index:75;left:0;right:0;bottom:0;height:calc(58px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:rgba(255,255,255,.98);border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(5,1fr)}.mobile-bottom a{min-height:58px;display:grid;place-items:center;color:#516278;font-size:13px}.mobile-bottom a:hover,.mobile-bottom a:focus-visible{color:var(--brand);background:var(--pale)}.site-footer{padding-bottom:98px}.footer-grid{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}.footer-bottom{flex-direction:column}.album-grid{grid-template-columns:1fr 1fr;grid-template-rows:220px 160px 160px}.media-slot.wide{grid-column:1/-1;grid-row:auto}.media-slot:nth-child(4),.media-slot:nth-child(5),.media-slot:nth-child(6){grid-column:auto}.media-slot:nth-child(6){grid-column:1/-1}.pulse-row{grid-template-columns:1fr;gap:4px}}
@media (max-width:560px){.hero-info{background:rgba(7,29,55,.86)}.hero-info span{font-size:12px}.hero-info h1{font-size:30px}.hero-info p{font-size:14px}.portal-four{grid-template-columns:1fr}.portal-four a{min-height:92px}.editor-grid{grid-template-columns:1fr}.story-card.large{grid-column:auto;min-height:unset}.timeline-four,.route-six,.guide-grid,.principle-grid,.topic-grid,.interest-grid{grid-template-columns:1fr}.copy-block h2{font-size:28px}.section-head h2{font-size:26px}.article-section h2{font-size:25px}.mega-grid{grid-template-columns:1fr}.search-row{flex-direction:column}.search-row button{width:100%}.album-grid{grid-template-columns:1fr;grid-template-rows:repeat(6,190px)}.media-slot,.media-slot.wide,.media-slot:nth-child(4),.media-slot:nth-child(5),.media-slot:nth-child(6){grid-column:auto}.page-intro h1{font-size:29px}}