:root{
--bg:#fff;--bg-soft:#f7faff;--bg-blue:#edf5ff;--bg-gray:#f5f6f8;--title:#172033;--text:#3e4859;--muted:#6f7a89;--assist:#98a1af;--blue:#1478f2;--blue-light:#2f8cff;--blue-deep:#075dc9;--blue-dark:#084a9c;--blue-pale:#d9eafe;--white:#fff;--border:rgba(20,120,242,.12);--border-gray:rgba(30,50,70,.08);--shadow:0 14px 38px rgba(21,67,118,.08);--shadow-blue:0 16px 42px rgba(20,120,242,.15);--grad:linear-gradient(135deg,#3a96ff 0%,#1478f2 55%,#0863d3 100%);--footer:#0b1f38;--max:1280px;--radius:18px;--nav-h:74px}
*{box-sizing:border-box}
html{scroll-behavior:smooth;overflow-x:hidden}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.75;overflow-x:hidden}
body.panel-open{overflow:hidden}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%;height:auto}
button,input{font:inherit}
button{cursor:pointer}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip-link{position:fixed;left:12px;top:10px;z-index:1000;background:var(--title);color:#fff;padding:9px 13px;border-radius:10px;transform:translateY(-160%)}
.skip-link:focus{transform:none}
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:saturate(140%) blur(14px);border-bottom:1px solid var(--border-gray)}
.nav-shell{height:var(--nav-h);max-width:var(--max);margin:auto;padding:0 22px;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:24px}
.desktop-brand{display:flex;align-items:center;gap:11px;min-width:235px}
.brand-link,.mobile-brand{display:flex;align-items:center}
.brand-logo{height:38px;width:auto;object-fit:contain}
.brand-wordmark{font-weight:900;color:var(--blue);font-size:22px;white-space:nowrap}
.brand-tagline{font-size:12px;color:var(--blue-deep);background:var(--bg-blue);padding:4px 8px;border-radius:999px;white-space:nowrap}
.desktop-nav{display:flex;justify-content:center;align-items:center;gap:4px;min-width:0}
.desktop-nav a{padding:10px 11px;border-radius:10px;color:var(--muted);font-size:15px;font-weight:700;white-space:nowrap}
.desktop-nav a:hover,.desktop-nav a.is-current{color:var(--blue);background:var(--bg-blue)}
.desktop-actions{display:flex;align-items:center;gap:6px}
.nav-action,.mobile-nav-button{min-height:44px;border:0;background:transparent;padding:9px 12px;border-radius:11px;font-weight:800;color:var(--title);display:inline-flex;align-items:center;justify-content:center}
.nav-action:hover,.mobile-nav-button:hover{background:var(--bg-gray)}
.nav-action-primary{background:var(--grad);color:#fff;box-shadow:0 8px 18px rgba(20,120,242,.22)}
.nav-action-primary:hover{background:var(--grad);color:#fff;transform:translateY(-1px)}
.mobile-nav-row{display:none}
.site-main{min-height:60vh}
.shell{max-width:var(--max);margin:0 auto;padding-left:22px;padding-right:22px}
.section{padding:72px 0}
.section-soft{background:var(--bg-soft)}
.section-blue{background:var(--bg-blue)}
.section-gray{background:var(--bg-gray)}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:26px}
.section-head h2{margin:0;color:var(--title);font-size:clamp(27px,3vw,40px);line-height:1.2}
.section-head p{margin:8px 0 0;max-width:760px;color:var(--muted)}
.section-link{color:var(--blue);font-weight:800;white-space:nowrap}
.eyebrow{display:inline-block;color:var(--blue);font-weight:900;font-size:13px;letter-spacing:.08em;margin-bottom:8px}
.lead{font-size:18px;color:var(--muted);max-width:860px}
.mini-label{display:inline-flex;align-items:center;gap:7px;color:var(--blue-dark);background:var(--bg-blue);padding:5px 9px;border-radius:999px;font-size:13px;font-weight:800}
.mini-label:before{content:"";width:7px;height:7px;border-radius:50%;background:var(--blue)}
.text-link{color:var(--blue);font-weight:800}
.text-link:hover{text-decoration:underline}
.primary-link{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:10px 18px;border-radius:13px;background:var(--grad);color:#fff;font-weight:900;box-shadow:var(--shadow-blue)}
.secondary-link{display:inline-flex;align-items:center;min-height:44px;color:var(--blue);font-weight:800}
.button-row{display:flex;flex-wrap:wrap;gap:14px;align-items:center}
.card{background:#fff;border:1px solid var(--border-gray);border-radius:var(--radius);box-shadow:var(--shadow)}
.card-lite{background:#fff;border:1px solid var(--border);border-radius:16px}
.card h3,.card-lite h3{margin-top:0;color:var(--title)}
.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}
.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}
.grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.tag{font-size:13px;color:var(--blue-dark);background:var(--bg-blue);padding:4px 9px;border-radius:999px}
.note{padding:15px 17px;border-left:3px solid var(--blue);background:var(--bg-soft);border-radius:0 12px 12px 0;color:var(--muted)}

/* 首页 */
.home-hero{padding:38px 0 26px;background:linear-gradient(180deg,#fff 0%,#f7fbff 100%)}
.editorial-hero{display:grid;grid-template-columns:.9fr 1.45fr .95fr;gap:22px;align-items:stretch}
.hero-left{padding:28px}
.hero-left h1{font-size:clamp(32px,4vw,54px);line-height:1.08;color:var(--title);margin:14px 0 18px}
.hero-left p{margin:0 0 22px;color:var(--muted)}
.hero-center{min-height:430px;border-radius:24px;overflow:hidden;position:relative;background:radial-gradient(circle at 75% 20%,rgba(255,255,255,.35),transparent 28%),linear-gradient(145deg,#0a5fd0,#1680f6 54%,#71b4ff);display:flex;align-items:flex-end;box-shadow:var(--shadow-blue)}
.hero-center img{width:100%;height:100%;object-fit:contain;background:#fff}
.hero-center-fallback{padding:36px;color:#fff;position:relative;z-index:1}
.hero-center-fallback small{display:block;opacity:.84;letter-spacing:.18em}
.hero-center-fallback strong{display:block;font-size:clamp(36px,5vw,64px);line-height:1.06;margin:12px 0}
.hero-center-fallback p{max-width:470px;margin:0;opacity:.9}
.hero-right{display:grid;grid-template-columns:1fr;gap:12px}
.quick-card{padding:19px;border-radius:16px;background:#fff;border:1px solid var(--border-gray);box-shadow:var(--shadow)}
.quick-card h2{font-size:18px;margin:0 0 7px;color:var(--title)}
.quick-card p{font-size:14px;margin:0 0 8px;color:var(--muted)}
.channel-strip{max-width:var(--max);margin:20px auto 0;padding:0 22px;display:flex;gap:8px;overflow-x:auto;overscroll-behavior-x:contain;scrollbar-width:none}
.channel-strip::-webkit-scrollbar{display:none}
.channel-strip a{flex:0 0 auto;padding:9px 12px;border-radius:999px;background:#fff;border:1px solid var(--border);color:var(--muted);font-weight:700;font-size:14px}
.channel-strip a:hover{color:var(--blue);background:var(--bg-blue)}
.overview-grid{display:grid;grid-template-columns:1.1fr .85fr 1fr 1.25fr;gap:18px}
.overview-item{padding:22px}
.overview-item:nth-child(2){margin-top:24px}
.overview-item:nth-child(3){margin-top:8px}
.discussion-layout{display:grid;grid-template-columns:1.2fr 1.8fr;gap:26px}
.discussion-main{padding:30px;background:var(--title);color:#fff;border-radius:22px;box-shadow:var(--shadow)}
.discussion-main h3{font-size:30px;line-height:1.3;margin:0 0 18px}
.discussion-main p{color:#dbe6f4}
.discussion-main a{color:#9dc9ff}
.discussion-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.discussion-card{padding:20px;background:#fff;border:1px solid var(--border-gray);border-radius:16px}
.discussion-card h3{font-size:18px;margin:0 0 8px;color:var(--title)}
.discussion-card p{font-size:14px;margin:0 0 8px;color:var(--muted)}
.city-map-grid{display:grid;grid-template-columns:1.25fr .75fr 1fr;grid-auto-rows:minmax(180px,auto);gap:16px}
.city-map-grid article{padding:24px}
.city-map-grid article:nth-child(1){grid-row:span 2;background:var(--bg-blue)}
.city-map-grid article:nth-child(4){grid-column:span 2}
.life-mosaic{display:grid;grid-template-columns:repeat(12,1fr);gap:16px}
.life-mosaic article{padding:22px;min-height:180px}
.life-mosaic article:nth-child(1),.life-mosaic article:nth-child(4){grid-column:span 5}
.life-mosaic article:nth-child(2),.life-mosaic article:nth-child(5){grid-column:span 3}
.life-mosaic article:nth-child(3),.life-mosaic article:nth-child(6){grid-column:span 4}
.route-notes{display:grid;grid-template-columns:repeat(6,minmax(205px,1fr));gap:14px;overflow-x:auto;padding-bottom:4px;overscroll-behavior-x:contain}
.route-note{padding:20px;min-width:205px}
.route-step{display:block;font-size:12px;color:var(--blue);font-weight:900;letter-spacing:.08em}
.interest-cloud{display:flex;flex-wrap:wrap;gap:13px}
.interest-pill{flex:1 1 240px;padding:20px;border-radius:20px;background:#fff;border:1px solid var(--border);box-shadow:var(--shadow)}
.interest-pill:nth-child(3n+1){flex-basis:300px}
.qa-list{display:grid;gap:12px}
.qa-row{display:grid;grid-template-columns:52px 1fr auto;gap:16px;align-items:start;padding:20px 22px;background:#fff;border:1px solid var(--border-gray);border-radius:16px}
.qa-mark{width:42px;height:42px;border-radius:13px;background:var(--bg-blue);color:var(--blue);font-weight:900;display:grid;place-items:center}
.qa-row h3{font-size:18px;margin:0 0 6px;color:var(--title)}
.qa-row p{margin:0;color:var(--muted)}
.story-layout{display:grid;grid-template-columns:1.2fr .8fr;gap:24px}
.story-main{padding:30px}
.story-main h3{font-size:30px;line-height:1.3;margin:0 0 16px}
.story-side{display:grid;gap:13px}
.story-side article{padding:19px}
.discover-wall{columns:3;column-gap:18px}
.discover-wall article{break-inside:avoid;padding:22px;margin:0 0 18px}
.discover-wall article:nth-child(3n+1){padding-bottom:38px}
.guide-grid,.principle-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.guide-card,.principle-card{padding:22px}
.app-showcase{display:grid;grid-template-columns:1fr .85fr;gap:34px;align-items:center}
.app-visual{min-height:390px;border-radius:26px;background:linear-gradient(145deg,#edf5ff,#d9eafe);display:grid;place-items:center;padding:28px}
.app-visual img{max-height:390px;object-fit:contain}
.phone-fallback{width:min(260px,70%);aspect-ratio:9/18;border:10px solid var(--title);border-radius:34px;background:#fff;box-shadow:var(--shadow-blue);padding:16px}
.phone-fallback:before{content:"海角社区";display:block;background:var(--grad);color:#fff;border-radius:18px;padding:16px;text-align:center;font-weight:900}
.service-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:22px}
.service-grid div{padding:16px;border-radius:14px;background:var(--bg-soft);border:1px solid var(--border-gray)}
.safety-privacy{display:grid;grid-template-columns:1fr 1fr;gap:26px}
.safety-block,.privacy-block{padding:32px;border-radius:24px}
.safety-block{background:var(--title);color:#fff}
.safety-block h3{color:#fff}
.safety-block p{color:#d9e4f0}
.privacy-block{background:var(--bg-blue);margin-top:50px}
.faq-list details,.faq-page-list details{background:#fff;border:1px solid var(--border-gray);border-radius:14px;padding:0 18px}
.faq-list details+details,.faq-page-list details+details{margin-top:10px}
.faq-list summary,.faq-page-list summary{cursor:pointer;font-weight:800;color:var(--title);padding:17px 0;min-height:48px}
.faq-list details p,.faq-page-list details p{margin-top:0;color:var(--muted)}
.brand-manifesto{padding:48px;border-radius:28px;background:linear-gradient(135deg,#0b61cf,#1478f2 58%,#459cff);color:#fff;position:relative;overflow:hidden}
.brand-manifesto h2{font-size:clamp(30px,4vw,50px);line-height:1.2;margin:0 0 18px}
.brand-manifesto p{max-width:980px;color:#eaf3ff}

/* 栏目页 */
.page-intro{padding:64px 0 34px}
.page-intro .intro-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:30px;align-items:end}
.page-intro h1{font-size:clamp(38px,5vw,64px);line-height:1.08;color:var(--title);margin:8px 0 18px}
.page-intro p{font-size:18px;color:var(--muted);margin:0}
.intro-aside{padding:22px;border-radius:18px;background:var(--bg-blue);color:var(--blue-dark)}
.index-list{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
.index-list a{padding:18px;border-radius:14px;background:#fff;border:1px solid var(--border-gray);font-weight:800;color:var(--title)}
.index-list a span{display:block;font-size:13px;color:var(--muted);font-weight:500;margin-top:5px}
.editorial-board{display:grid;grid-template-columns:1.1fr .9fr;gap:24px}
.board-primary,.board-secondary{padding:28px}
.topic-directory,.journal-list,.interest-detail-grid,.principles-list,.install-steps,.risk-grid,.privacy-grid,.rules-grid,.help-grid,.feedback-grid,.contact-grid,.about-values{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.topic-item,.journal-list article,.interest-detail-grid article,.principles-list article,.install-steps article,.risk-grid article,.privacy-grid article,.rules-grid article,.help-grid article,.feedback-grid article,.contact-grid article,.about-values article{padding:24px}
.city-index{display:flex;gap:10px;flex-wrap:wrap;margin:8px 0 28px}
.city-index span{padding:7px 11px;border-radius:999px;background:var(--bg-blue);color:var(--blue-dark);font-weight:700;font-size:14px}
.horizontal-entries{display:grid;gap:16px}
.horizontal-entry{display:grid;grid-template-columns:180px 1fr;gap:24px;padding:24px;border-bottom:1px solid var(--border-gray)}
.horizontal-entry strong{color:var(--title);font-size:22px}
.magazine-grid{display:grid;grid-template-columns:1.3fr .7fr;gap:20px}
.magazine-grid article{padding:26px}
.magazine-grid article:first-child{grid-row:span 2}
.route-steps{display:grid}
.route-step-row{display:grid;grid-template-columns:80px 1fr;gap:20px;padding:24px 0;border-bottom:1px solid var(--border-gray)}
.route-step-row .num{font-size:34px;color:var(--blue);font-weight:900}
.interest-tags-large{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:28px}
.interest-tags-large a{padding:10px 15px;border-radius:999px;background:var(--bg-blue);color:var(--blue-dark);font-weight:800}
.question-directory{display:grid;gap:13px}
.question-directory article{padding:23px}
.question-directory h2{font-size:21px;margin:0 0 8px}
.longread-list{display:grid;gap:18px}
.longread-list article{padding:30px;border-left:4px solid var(--blue)}
.longread-list h2{margin:0 0 8px}
.topic-wall{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.topic-wall article{padding:24px}
.topic-wall article:first-child{grid-column:span 2}
.guide-directory{display:grid;grid-template-columns:240px 1fr;gap:28px}
.guide-nav{position:sticky;top:96px;align-self:start;padding:18px}
.guide-nav a{display:block;padding:10px 12px;border-radius:10px;color:var(--muted)}
.guide-nav a:hover{background:var(--bg-blue);color:var(--blue)}
.guide-articles{display:grid;gap:18px}
.guide-articles article{padding:28px}
.process-steps{counter-reset:step;display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.process-steps div{padding:20px;background:#fff;border-radius:16px;border:1px solid var(--border-gray)}
.process-steps div:before{counter-increment:step;content:counter(step);width:32px;height:32px;border-radius:10px;background:var(--blue);color:#fff;display:grid;place-items:center;font-weight:900;margin-bottom:10px}
.notice-list{display:grid;gap:12px}
.notice-list article{display:grid;grid-template-columns:170px 1fr;gap:20px;padding:22px;border-bottom:1px solid var(--border-gray)}
.notice-list strong{color:var(--blue);font-size:14px}
.product-features{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:24px}
.product-features article{padding:22px}
.risk-grid article:first-child{grid-column:span 2;background:var(--title);color:#fff}
.risk-grid article:first-child h2{color:#fff}
.faq-page-list{max-width:980px;margin:auto}
.about-timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.about-timeline div{padding:20px;border-top:3px solid var(--blue);background:var(--bg-soft);border-radius:0 0 16px 16px}

/* 菜单与搜索 */
.screen-overlay{position:fixed;inset:var(--nav-h) 0 0;background:rgba(11,31,56,.42);z-index:190}
.mega-menu,.search-panel{position:fixed;left:0;right:0;top:var(--nav-h);z-index:200;background:#fff;box-shadow:0 22px 50px rgba(11,31,56,.18);visibility:hidden;pointer-events:none;opacity:0;transform:translateY(-10px);transition:opacity .18s ease,transform .18s ease,visibility .18s}
.mega-menu.is-open,.search-panel.is-open{visibility:visible;pointer-events:auto;opacity:1;transform:none}
.mega-menu-inner,.search-inner{max-width:var(--max);margin:auto;padding:26px 22px 30px;max-height:calc(100vh - var(--nav-h));overflow:auto}
.panel-heading{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:22px}
.panel-heading h2{margin:0;color:var(--title);font-size:28px}
.panel-close{min-width:58px;min-height:44px;border:1px solid var(--border-gray);background:#fff;border-radius:12px;font-weight:800}
.mega-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.mega-grid h3{margin:0 0 12px;color:var(--title)}
.mega-grid a{display:block;padding:10px 0;border-top:1px solid var(--border-gray)}
.mega-grid a strong{display:block;color:var(--title)}
.mega-grid a span{display:block;font-size:13px;color:var(--muted);margin-top:2px}
.search-box{display:block}
.search-box input{width:100%;height:58px;border:1px solid var(--border);border-radius:15px;padding:0 18px;font-size:18px;outline:none;background:var(--bg-soft)}
.search-box input:focus{border-color:var(--blue);box-shadow:0 0 0 4px rgba(20,120,242,.1)}
.search-suggestions{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0 20px}
.search-suggestions button{border:0;background:var(--bg-blue);color:var(--blue-dark);padding:8px 11px;border-radius:999px}
.search-link-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}
.search-link-grid a{padding:16px;border:1px solid var(--border-gray);border-radius:14px;background:#fff}
.search-link-grid a strong{display:block;color:var(--title)}
.search-link-grid a span{display:block;font-size:13px;color:var(--muted);margin-top:3px}
.search-empty{padding:18px;background:var(--bg-gray);border-radius:12px;color:var(--muted)}

/* 页脚 */
.site-footer{background:var(--footer);color:#eaf3ff;padding:58px 0 28px}
.footer-shell{max-width:var(--max);margin:auto;padding:0 22px}
.footer-brand-row{display:grid;grid-template-columns:.8fr 1.2fr;gap:38px;padding-bottom:30px;border-bottom:1px solid rgba(255,255,255,.1)}
.footer-brand{display:flex;align-items:center;gap:15px}
.footer-logo{height:44px;width:auto}
.footer-brand strong{display:block;font-size:22px}
.footer-brand span{display:block;font-size:12px;letter-spacing:.15em;color:#a8c8ed}
.footer-brand-row p{margin:0;color:#bdd3eb}
.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:28px;padding:32px 0}
.footer-grid h2{font-size:15px;margin:0 0 12px;color:#fff}
.footer-grid a{display:block;color:#bcd2e8;padding:4px 0;font-size:14px}
.footer-grid a:hover{color:#fff}
.footer-reminder{padding:16px 18px;border-radius:14px;background:rgba(255,255,255,.06);color:#bfd5ea}
.footer-bottom{display:flex;justify-content:space-between;gap:20px;color:#91b2d3;font-size:13px;margin-top:22px}
.footer-bottom a{color:#cfe3f7}
.mobile-bottom-nav{display:none}

a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid rgba(20,120,242,.35);outline-offset:3px}

@media (max-width:1120px){
  .desktop-brand{min-width:auto}.brand-tagline{display:none}.desktop-nav a{padding:9px 7px;font-size:14px}
  .editorial-hero{grid-template-columns:1fr 1.25fr}.hero-right{grid-column:1/-1;grid-template-columns:repeat(4,1fr)}
  .search-link-grid{grid-template-columns:repeat(3,1fr)}.mega-grid{gap:14px}
  .overview-grid{grid-template-columns:repeat(2,1fr)}
  .city-map-grid{grid-template-columns:1fr 1fr}.city-map-grid article:nth-child(1){grid-row:auto}.city-map-grid article:nth-child(4){grid-column:auto}
  .service-grid{grid-template-columns:repeat(2,1fr)}
}

@media (max-width:820px){
  :root{--nav-h:62px}
  .nav-shell{height:var(--nav-h);display:block;padding:0 15px}
  .desktop-brand,.desktop-nav,.desktop-actions{display:none}
  .mobile-nav-row{height:100%;display:grid;grid-template-columns:72px 1fr 72px;align-items:center}
  .mobile-nav-button{padding:8px;min-height:44px}
  .mobile-brand{justify-content:center;min-width:0}
  .mobile-brand .brand-logo{max-width:150px;height:34px}
  .mobile-brand .brand-wordmark{font-size:20px}
  .shell{padding-left:15px;padding-right:15px}
  .section{padding:54px 0}
  .section-head{align-items:start;flex-direction:column;gap:8px}
  .section-head h2{font-size:30px}
  .grid-2,.grid-3,.grid-4,.discussion-layout,.story-layout,.app-showcase,.safety-privacy,.editorial-board,.magazine-grid,.topic-directory,.journal-list,.interest-detail-grid,.principles-list,.install-steps,.risk-grid,.privacy-grid,.rules-grid,.help-grid,.feedback-grid,.contact-grid,.about-values{grid-template-columns:1fr}
  .home-hero{padding-top:20px}.editorial-hero{grid-template-columns:1fr}.hero-left{order:1;padding:24px}.hero-center{order:2;min-height:280px}.hero-right{order:3;grid-column:auto;grid-template-columns:1fr 1fr}.hero-left h1{font-size:38px}
  .overview-grid{grid-template-columns:1fr}.overview-item:nth-child(2),.overview-item:nth-child(3){margin-top:0}
  .discussion-grid{grid-template-columns:1fr}.city-map-grid{grid-template-columns:1fr}
  .life-mosaic{grid-template-columns:1fr}.life-mosaic article:nth-child(n){grid-column:auto}
  .route-notes{margin-right:-15px;padding-right:15px}
  .interest-pill,.interest-pill:nth-child(3n+1){flex-basis:100%}
  .qa-row{grid-template-columns:44px 1fr}.qa-row .text-link{grid-column:2}
  .discover-wall{columns:1}.guide-grid,.principle-grid{grid-template-columns:1fr}
  .app-visual{min-height:300px}.privacy-block{margin-top:0}
  .page-intro{padding:42px 0 26px}.page-intro .intro-grid{grid-template-columns:1fr}.page-intro h1{font-size:42px}
  .index-list{grid-template-columns:1fr 1fr}.topic-wall{grid-template-columns:1fr}.topic-wall article:first-child{grid-column:auto}
  .horizontal-entry{grid-template-columns:1fr;gap:7px}
  .guide-directory{grid-template-columns:1fr}.guide-nav{position:static;display:flex;overflow:auto;padding:10px}.guide-nav a{white-space:nowrap}
  .process-steps{grid-template-columns:1fr 1fr}.notice-list article{grid-template-columns:1fr;gap:6px}
  .about-timeline{grid-template-columns:1fr 1fr}
  .risk-grid article:first-child{grid-column:auto}
  .mega-menu{top:0;left:auto;width:min(92vw,390px);height:100vh;transform:translateX(100%);box-shadow:-16px 0 40px rgba(11,31,56,.2)}
  .mega-menu.is-open{transform:none}.mega-menu-inner{max-height:100vh;padding:22px 18px 90px}.mega-grid{grid-template-columns:1fr}
  .screen-overlay{inset:0}
  .search-panel{top:0;bottom:0;transform:none}.search-inner{max-height:100vh;height:100%;padding:20px 15px 90px}.search-link-grid{grid-template-columns:1fr 1fr}
  .site-footer{padding-bottom:100px}.footer-brand-row{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr}.footer-bottom{flex-direction:column}
  .mobile-bottom-nav{position:fixed;z-index:120;left:0;right:0;bottom:0;display:grid;grid-template-columns:repeat(5,1fr);background:rgba(255,255,255,.97);border-top:1px solid var(--border-gray);padding-bottom:env(safe-area-inset-bottom)}
  .mobile-bottom-nav a{min-height:54px;display:grid;place-items:center;font-size:13px;color:var(--muted);font-weight:800}
  .mobile-bottom-nav a.is-current{color:var(--blue);background:var(--bg-blue)}
  .panel-open .mobile-bottom-nav{z-index:110}
}

@media (max-width:520px){
  .hero-right{grid-template-columns:1fr}.hero-left{padding:20px}.hero-left h1{font-size:34px}.hero-center{min-height:230px}
  .channel-strip{padding-left:15px;padding-right:15px}
  .index-list,.search-link-grid,.process-steps,.product-features,.about-timeline{grid-template-columns:1fr}
  .brand-manifesto{padding:30px 24px}.footer-grid{grid-template-columns:1fr 1fr;gap:20px}.page-intro h1{font-size:36px}.section{padding:46px 0}
}

@media (prefers-reduced-motion:reduce){
  *,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}
}


/* 补充栏目页差异化排版 */
.section.alt{background:var(--bg-soft)}
.section-heading{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:26px}
.section-heading h2{margin:0;color:var(--title);font-size:clamp(27px,3vw,40px);line-height:1.2}
.section-heading p{max-width:760px;color:var(--muted);margin:8px 0 0}
.section-heading>a{color:var(--blue);font-weight:800;white-space:nowrap}
.editorial-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:20px}
.feature-card,.stack-list article,.journal-card,.interest-detail,.qa-index article,.topic-index article,.install-grid article,.help-directory article,.contact-directory article,.app-feature-list article,.rule-sections article,.about-values article{background:#fff;border:1px solid var(--border-gray);border-radius:var(--radius);box-shadow:var(--shadow)}
.feature-card{padding:30px}
.feature-card h2,.feature-card h3{color:var(--title);margin-top:10px}
.stack-list{display:grid;gap:16px}
.stack-list article{padding:22px}
.card-grid{display:grid;gap:18px}
.card-grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}
.card-grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}
.card-grid.four{grid-template-columns:repeat(4,minmax(0,1fr))}
.card-grid .card{padding:22px}
.split-layout{display:grid;grid-template-columns:1.35fr .65fr;gap:28px;align-items:start}
.note-card{padding:24px;background:var(--bg-blue);border:1px solid var(--border);border-radius:18px;color:var(--blue-dark)}
.note-card h3{color:var(--title);margin-top:0}
.steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.steps article{padding:22px;border:1px solid var(--border-gray);border-radius:16px;background:#fff}
.steps b{display:inline-grid;place-items:center;width:38px;height:38px;border-radius:11px;background:var(--blue);color:#fff;margin-bottom:9px}
.steps h3{margin:0 0 6px;color:var(--title)}
.route-list{display:grid;gap:0}
.route-list article{display:grid;grid-template-columns:72px 1fr;gap:20px;padding:25px 0;border-bottom:1px solid var(--border-gray)}
.route-list article>span{font-size:30px;line-height:1;color:var(--blue);font-weight:900}
.route-list h3{margin:0 0 8px;color:var(--title)}
.route-list p{margin:0 0 8px}
.route-list small{display:block;color:var(--muted)}
.city-list article:nth-child(odd){background:linear-gradient(90deg,var(--bg-soft),transparent);padding-left:18px;border-radius:14px}
.magazine-grid>.feature-card{min-height:100%;background:var(--bg-blue)}
.journal-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.journal-card{padding:22px}
.journal-card>span{color:var(--blue);font-weight:900;font-size:13px}
.journal-card h3{margin:7px 0;color:var(--title)}
.interest-cloud>a{padding:10px 16px;border-radius:999px;background:var(--bg-blue);color:var(--blue-dark);font-weight:800;border:1px solid var(--border)}
.interest-detail-grid{align-items:start}
.interest-detail{padding:24px}
.interest-detail h2{font-size:22px;line-height:1.35;color:var(--title);margin:12px 0}
.qa-index,.topic-index,.install-grid,.help-directory,.contact-directory,.app-feature-list,.rule-sections{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.qa-index article,.topic-index article,.install-grid article,.help-directory article,.contact-directory article,.app-feature-list article,.rule-sections article{padding:24px}
.qa-index h2,.topic-index h2,.install-grid h2,.help-directory h2,.contact-directory h2,.rule-sections h2{font-size:21px;line-height:1.35;margin:10px 0;color:var(--title)}
.story-lead{background:var(--bg-blue);border-left-color:var(--blue-dark)!important}
.story-lead h2{font-size:clamp(28px,3vw,40px)}
.discover-wall article{background:#fff;border:1px solid var(--border-gray);border-radius:var(--radius);box-shadow:var(--shadow)}
.discover-wall article.wide{background:var(--bg-blue)}
.discover-wall article.tall{padding-bottom:44px}
.discover-wall h2,.discover-wall h3{color:var(--title)}
.discover-wall small{display:block;color:var(--muted);margin:9px 0}
.topic-index article:first-child{grid-column:1/-1;background:var(--title);color:#eaf3ff}
.topic-index article:first-child h2{color:#fff;font-size:29px}
.topic-index article:first-child .boundary{background:rgba(255,255,255,.08);color:#eaf3ff}
.topic-index article:first-child a{color:#9dc9ff}
.boundary{margin:14px 0;padding:11px 13px;background:var(--bg-soft);border-radius:11px;color:var(--muted)}
.guide-layout{display:grid;grid-template-columns:240px 1fr;gap:28px}
.guide-layout .guide-nav{background:#fff;border:1px solid var(--border-gray);border-radius:16px;box-shadow:var(--shadow)}
.guide-layout .guide-articles article{background:#fff;border:1px solid var(--border-gray);border-radius:18px;box-shadow:var(--shadow)}
.principle-list{display:grid;gap:16px}
.principle-list article{display:grid;grid-template-columns:58px 1fr;gap:18px;padding:24px;background:#fff;border:1px solid var(--border-gray);border-radius:18px}
.principle-list article>span{font-size:24px;color:var(--blue);font-weight:900}
.principle-list h2{font-size:23px;margin:0 0 8px;color:var(--title)}
.notice-list article{background:#fff;border:1px solid var(--border-gray);border-radius:16px}
.notice-list article>.tag{align-self:start;justify-self:start}
.notice-list article h2{font-size:21px;margin:0 0 8px;color:var(--title)}
.app-showcase{display:grid;grid-template-columns:1.1fr .9fr;gap:34px;align-items:center}
.app-copy h2{font-size:clamp(30px,4vw,48px);line-height:1.2;color:var(--title);margin:8px 0 18px}
.actions{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-top:22px}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:10px 18px;border-radius:13px;font-weight:900}
.btn.primary{background:var(--grad);color:#fff;box-shadow:var(--shadow-blue)}
.app-art{min-height:430px;display:grid;place-items:center;padding:26px;border-radius:26px;background:var(--bg-blue)}
.app-art img{max-height:520px;object-fit:contain}
.phone-placeholder{width:min(290px,80%);aspect-ratio:9/17;border:10px solid var(--title);border-radius:34px;background:linear-gradient(160deg,#fff,var(--bg-blue));box-shadow:var(--shadow-blue);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;text-align:center}
.phone-placeholder span{color:var(--blue);font-weight:900}.phone-placeholder strong{font-size:30px;color:var(--title)}.phone-placeholder small{color:var(--muted)}
.app-feature-list{margin-top:12px}
.risk-grid article{border-radius:18px;border:1px solid var(--border-gray);background:#fff;box-shadow:var(--shadow)}
.privacy-grid article{border-radius:18px;border:1px solid var(--border-gray);background:#fff;box-shadow:var(--shadow)}
.rule-sections article>span{display:inline-grid;place-items:center;width:38px;height:38px;border-radius:11px;background:var(--bg-blue);color:var(--blue);font-weight:900}
.faq-list{max-width:980px;margin:auto;display:grid;gap:12px}
.faq-list details{background:#fff;border:1px solid var(--border-gray);border-radius:15px;padding:0 20px}
.faq-list summary{cursor:pointer;padding:18px 36px 18px 0;color:var(--title);font-weight:900;position:relative}
.faq-list summary:after{content:"＋";position:absolute;right:0;color:var(--blue)}
.faq-list details[open] summary:after{content:"－"}
.faq-list details p{margin:0 0 20px;color:var(--muted)}
.feedback-grid article,.contact-directory article{border-radius:18px}
.about-story{display:grid;grid-template-columns:.9fr 1.1fr;gap:28px;align-items:start}
.about-lead{position:sticky;top:98px;padding:30px;background:var(--title);color:#dbe6f4;border-radius:22px}
.about-lead h2{color:#fff;font-size:32px;line-height:1.3}
.about-values{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.about-values article{padding:22px}
.about-values article span{color:var(--blue);font-weight:900}
.manifesto{padding:42px 22px}
.manifesto h2{font-size:clamp(30px,4vw,50px);line-height:1.2;color:var(--title);max-width:900px}
.manifesto p{max-width:1060px;font-size:17px}

@media (max-width:820px){
  .section-heading{align-items:start;flex-direction:column;gap:8px}
  .editorial-grid,.split-layout,.guide-layout,.app-showcase,.about-story{grid-template-columns:1fr}
  .card-grid.three,.card-grid.four,.steps,.qa-index,.topic-index,.install-grid,.help-directory,.contact-directory,.app-feature-list,.rule-sections,.journal-grid{grid-template-columns:1fr}
  .route-list article{grid-template-columns:48px 1fr;gap:12px}
  .topic-index article:first-child{grid-column:auto}
  .principle-list article{grid-template-columns:44px 1fr;padding:20px}
  .guide-layout .guide-nav{position:static;display:flex;overflow-x:auto;white-space:nowrap}
  .about-lead{position:static}
  .about-values{grid-template-columns:1fr}
  .app-art{min-height:320px}
}