:root{
  --night:#060b20;
  --night-2:#0b1434;
  --indigo:#182452;
  --blue:#35a9ff;
  --blue-soft:#89d1ff;
  --window:#ffd36a;
  --window-soft:#fff0b5;
  --paper:#f3f6ff;
  --muted:#9eaaca;
  --line:rgba(132,160,222,.28);
  --shell:min(1180px,calc(100% - 40px));
  --display:"Arial Narrow","Microsoft YaHei UI",sans-serif;
  --body:"Microsoft YaHei UI","Microsoft YaHei",sans-serif;
  --utility:Consolas,"Microsoft YaHei UI",monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;min-width:320px;color:var(--paper);background:var(--night);font-family:var(--body);line-height:1.72}
body::before{content:"";position:fixed;inset:0;z-index:-2;pointer-events:none;background:linear-gradient(rgba(53,169,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(53,169,255,.035) 1px,transparent 1px);background-size:64px 64px}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.shell{width:var(--shell);margin-inline:auto}
.site-header{position:sticky;top:0;z-index:50;border-bottom:1px solid var(--line);background:rgba(6,11,32,.9);backdrop-filter:blur(16px)}
.nav{min-height:76px;display:flex;align-items:center;justify-content:space-between;gap:28px}
.brand{display:inline-flex;align-items:center;gap:11px;font-family:var(--display);font-size:22px;font-weight:900;letter-spacing:.08em;white-space:nowrap}
.brand img{width:35px;height:35px;object-fit:contain}
.nav-links{display:flex;align-items:center;gap:26px;font-size:14px;font-weight:700}
.nav-links a{position:relative;color:var(--muted)}
.nav-links a:hover,.nav-links a[aria-current="page"]{color:var(--window-soft)}
.nav-links a[aria-current="page"]::after{content:"";position:absolute;left:0;right:0;bottom:-27px;height:2px;background:var(--window)}
.button{display:inline-flex;align-items:center;justify-content:center;min-width:148px;min-height:50px;padding:0 24px;border:1px solid var(--blue);border-radius:2px;color:#041126;background:var(--blue);font-weight:900;white-space:nowrap;word-break:keep-all;writing-mode:horizontal-tb;box-shadow:0 0 28px rgba(53,169,255,.22);transition:background .2s ease,color .2s ease,box-shadow .2s ease}
.button:hover{color:white;background:transparent;box-shadow:0 0 34px rgba(53,169,255,.36)}
a:focus-visible,summary:focus-visible{outline:3px solid var(--window);outline-offset:5px}
.eyebrow{margin:0 0 13px;color:var(--window);font:700 12px/1.4 var(--utility);letter-spacing:.18em}
h1,h2,h3{font-family:var(--display);font-weight:900}
h2{margin:0;font-size:clamp(34px,4.7vw,62px);line-height:1.08;letter-spacing:-.035em}

.city-hero{position:relative;overflow:hidden;padding:clamp(58px,8vw,105px) 0 0;background:radial-gradient(circle at 50% 32%,rgba(35,68,146,.54),transparent 42%),linear-gradient(180deg,#080d24 0%,#0a1331 68%,#05091b 100%)}
.hero-copy{position:relative;z-index:3;display:grid;grid-template-columns:minmax(0,850px) auto;align-items:end;column-gap:48px}
.guide-code{grid-column:1/-1;display:flex;align-items:center;gap:13px;margin-bottom:32px;color:var(--blue-soft);font:700 11px var(--utility);letter-spacing:.13em}
.guide-code b{color:var(--window);font-weight:400}
.hero-copy .eyebrow{grid-column:1}
.hero-copy h1{grid-column:1;margin:0;font-size:clamp(46px,7.2vw,96px);line-height:.98;letter-spacing:-.055em}
.hero-lead{grid-column:1;max-width:700px;margin:25px 0 30px;color:#bbc5df;font-size:clamp(16px,1.65vw,20px)}
.hero-copy>.button{grid-column:2;grid-row:3/6;align-self:center}
.platform-line{grid-column:1;margin:0;color:var(--muted);font:700 12px var(--utility);letter-spacing:.08em}
.city-stage{position:relative;height:clamp(470px,55vw,660px);margin-top:48px;border-top:1px solid var(--line)}
.city-stage::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,transparent 49.88%,rgba(137,209,255,.18) 50%,transparent 50.12%),linear-gradient(0deg,rgba(53,169,255,.09),transparent 36%);pointer-events:none}
.sky-label{position:absolute;inset:20px 0 auto;display:flex;justify-content:space-between;color:var(--muted);font:700 10px var(--utility);letter-spacing:.14em}
.building{position:absolute;bottom:62px;border:1px solid rgba(137,209,255,.2);border-bottom:0;background:linear-gradient(90deg,rgba(15,26,64,.9),rgba(25,42,91,.9));box-shadow:inset 8px 0 0 rgba(53,169,255,.035)}
.building::before{content:"";position:absolute;left:12%;right:12%;top:-8px;height:7px;background:var(--indigo)}
.building i{position:relative;display:block;width:8px;height:6px;margin:18px 14px;background:var(--window);box-shadow:22px 0 0 rgba(255,211,106,.18),44px 0 0 var(--window),0 19px 0 rgba(255,211,106,.22),44px 19px 0 rgba(255,211,106,.5)}
.building strong{position:absolute;left:12px;bottom:13px;color:var(--blue-soft);font:700 10px var(--utility);letter-spacing:.16em}
.building-a{left:2%;width:128px;height:248px}
.building-b{left:16%;width:110px;height:176px}
.building-c{right:2%;width:148px;height:308px}
.client-display{position:absolute;z-index:4;left:50%;bottom:64px;width:min(39vw,420px);margin:0;translate:-50% 0;align-self:center;height:auto;padding:0;overflow:visible;transform:none}
.client-display img{display:block;width:100%;height:auto;min-height:0;max-height:none;margin:0;padding:0;object-fit:contain;object-position:center;clip-path:none;transform:none}
.route{position:absolute;z-index:2;height:2px;background:var(--blue);box-shadow:0 0 12px var(--blue)}
.route::after{content:"";position:absolute;right:0;top:-4px;width:10px;height:10px;background:var(--window);box-shadow:0 0 16px var(--window)}
.route-one{left:10%;right:50%;bottom:215px}
.route-two{left:50%;right:7%;bottom:154px}
.street{position:absolute;left:0;right:0;bottom:0;height:63px;display:flex;align-items:center;justify-content:center;gap:18px;border-top:1px solid rgba(137,209,255,.25);background:#030617;color:var(--blue-soft);font:700 10px var(--utility);letter-spacing:.14em}
.street i{width:90px;height:2px;background:repeating-linear-gradient(90deg,var(--window) 0 20px,transparent 20px 34px)}

.district-band{padding:clamp(88px,11vw,145px) 0 0;background:#0c1534}
.district-heading{display:grid;grid-template-columns:.55fr 1.45fr;gap:38px;align-items:start;padding-bottom:50px}
.district-heading h2{max-width:15ch}
.district-line{display:flex;border-top:1px solid var(--line);border-bottom:1px solid var(--line);overflow-x:auto}
.district-line article{position:relative;flex:1 0 270px;min-height:280px;padding:38px clamp(25px,3vw,48px);border-right:1px solid var(--line);background:linear-gradient(180deg,rgba(26,39,83,.55),rgba(7,13,34,.2))}
.district-line article:last-child{border-right:0}
.district-line article::before{content:"";position:absolute;left:0;top:-5px;width:42%;height:5px;background:var(--blue)}
.district-line article:nth-child(even)::before{background:var(--window)}
.district-line span,.bulletins span{color:var(--blue-soft);font:700 10px var(--utility);letter-spacing:.16em}
.district-line h3{margin:52px 0 10px;font-size:26px}
.district-line p{margin:0;color:var(--muted)}

.scenario-stations{padding:clamp(95px,12vw,170px) 0}
.station-intro{display:grid;grid-template-columns:.55fr 1.05fr .8fr;gap:35px;align-items:end;margin-bottom:52px}
.station-intro p:last-child{margin:0;color:var(--muted)}
.station-list{border-top:1px solid var(--line)}
.station-list article{display:grid;grid-template-columns:150px 1fr 260px;gap:32px;align-items:center;min-height:150px;padding:26px 0;border-bottom:1px solid var(--line)}
.station-sign{justify-self:start;padding:7px 12px;border:1px solid var(--window);color:var(--window);font:700 11px var(--utility);letter-spacing:.12em}
.station-list h3{margin:0 0 5px;font-size:27px}
.station-list p{margin:0;color:var(--muted)}
.station-list em{color:var(--blue-soft);font:normal 700 11px var(--utility);letter-spacing:.08em;text-align:right}

.route-steps{padding:clamp(90px,11vw,150px) 0;background:linear-gradient(90deg,#111b41 0 33%,#080e25 33% 100%)}
.route-layout{display:grid;grid-template-columns:.7fr 1.3fr;gap:clamp(55px,9vw,130px)}
.route-layout header{position:sticky;top:120px;align-self:start}
.route-layout header p:last-child{max-width:32ch;color:var(--muted)}
.route-layout ol{position:relative;list-style:none;margin:0;padding:0 0 0 46px}
.route-layout ol::before{content:"";position:absolute;left:8px;top:16px;bottom:20px;width:2px;background:var(--blue);box-shadow:0 0 13px rgba(53,169,255,.65)}
.route-layout li{position:relative;min-height:190px;padding:0 0 50px}
.route-layout li::before{content:"";position:absolute;left:-43px;top:7px;width:12px;height:12px;border:3px solid var(--night);background:var(--window);box-shadow:0 0 0 2px var(--blue),0 0 18px var(--blue)}
.route-layout li span{color:var(--window);font:700 11px var(--utility);letter-spacing:.13em}
.route-layout li h3{margin:13px 0 8px;font-size:31px}
.route-layout li p{max-width:52ch;margin:0;color:var(--muted)}

.device-concourse{display:grid;grid-template-columns:1.15fr .85fr;gap:clamp(45px,8vw,105px);align-items:center;padding:clamp(95px,12vw,170px) 0}
.device-concourse figure{align-self:center;height:auto;margin:0;padding:0;overflow:visible;transform:none}
.device-concourse figure img{display:block;width:100%;height:auto;min-height:0;max-height:none;margin:0;padding:0;object-fit:contain;object-position:center;clip-path:none;transform:none}
.device-concourse h2{max-width:12ch}
.device-concourse p:not(.eyebrow){margin:22px 0 28px;color:var(--muted)}

.city-bulletin{padding:clamp(88px,10vw,140px) 0;background:#eaf0ff;color:#0b1434}
.bulletin-layout{display:grid;grid-template-columns:.72fr 1.28fr;gap:clamp(50px,8vw,110px)}
.city-bulletin .eyebrow{color:#245d91}
.bulletin-layout header h2{max-width:11ch}
.bulletins{border-top:4px solid #0b1434}
.bulletins article{display:grid;grid-template-columns:130px 1fr;column-gap:25px;padding:27px 0;border-bottom:1px solid rgba(11,20,52,.22)}
.bulletins span{grid-row:1/3;color:#245d91}
.bulletins h3{margin:0 0 6px;font-size:23px}
.bulletins p{margin:0;color:#4d5877}

.faq-crossing{display:grid;grid-template-columns:.7fr 1.3fr;gap:clamp(55px,9vw,125px);padding:clamp(95px,12vw,170px) 0}
.crossing-sign{align-self:start;padding-left:22px;border-left:7px solid var(--window)}
.crossing-sign h2{max-width:11ch}
.crossing-sign a{display:inline-block;margin-top:25px;color:var(--blue-soft);font-weight:800}
.faq-list{border-top:1px solid var(--line)}
details{border-bottom:1px solid var(--line)}
summary{cursor:pointer;list-style:none;padding:25px 40px 25px 0;font-size:18px;font-weight:900}
summary::-webkit-details-marker{display:none}
details p{max-width:60ch;margin:0 0 26px;color:var(--muted)}

.final-terminal{position:relative;padding:clamp(78px,10vw,130px) 0;text-align:center;background:linear-gradient(180deg,#0e1c48,#071027);border-block:1px solid var(--line)}
.final-terminal::before,.final-terminal::after{content:"";position:absolute;top:50%;width:22%;height:2px;background:repeating-linear-gradient(90deg,var(--blue) 0 30px,transparent 30px 46px)}
.final-terminal::before{left:0}.final-terminal::after{right:0}
.final-terminal h2{margin-inline:auto;max-width:15ch}
.final-terminal p:not(.eyebrow){margin:18px auto 28px;color:var(--muted)}
.site-footer{padding:60px 0 26px;background:#030617}
.footer-grid{display:grid;grid-template-columns:1.5fr .6fr .6fr;gap:45px}
.footer-grid h2,.footer-grid h3{margin-top:0}
.footer-grid p,.footer-grid a{color:var(--muted)}
.footer-grid p{max-width:38ch}
.footer-grid a{display:block;margin:7px 0}
.footer-grid a:hover{color:var(--window)}
.copyright{margin-top:34px;padding-top:22px;border-top:1px solid var(--line);color:#65708f;font-size:12px}

@media(max-width:900px){
  .nav{padding:12px 0;flex-wrap:wrap}.nav-links{order:3;width:100%;overflow-x:auto;padding-bottom:4px}.nav-links a[aria-current="page"]::after{bottom:-8px}
  .hero-copy{grid-template-columns:1fr}.hero-copy>.button{grid-column:1;grid-row:auto;justify-self:start;margin:28px 0 18px}.hero-lead,.platform-line{grid-column:1}
  .client-display{width:min(52vw,390px)}.building-c{right:0}.building-a{left:0}
  .district-heading,.station-intro,.route-layout,.device-concourse,.bulletin-layout,.faq-crossing{grid-template-columns:1fr}
  .route-layout header{position:static}.station-intro{align-items:start}.station-list article{grid-template-columns:120px 1fr}.station-list em{grid-column:2;text-align:left}
  .bulletin-layout header h2,.crossing-sign h2,.device-concourse h2{max-width:17ch}
}
@media(max-width:620px){
  :root{--shell:min(100% - 24px,1180px)}
  .nav-button{display:none}.nav-links{gap:20px}
  .guide-code{gap:8px;overflow-x:auto;white-space:nowrap}.hero-copy h1{font-size:clamp(42px,13.2vw,62px)}.hero-copy h1 br{display:none}
  .city-stage{height:470px}.sky-label{font-size:9px}.client-display{width:min(70vw,330px);bottom:63px}.building-a{width:80px;height:190px}.building-b{display:none}.building-c{width:88px;height:230px}.building i{margin-inline:9px;box-shadow:18px 0 0 rgba(255,211,106,.18),36px 0 0 var(--window),0 19px 0 rgba(255,211,106,.22),36px 19px 0 rgba(255,211,106,.5)}
  .route-one{left:2%;bottom:176px}.route-two{right:2%;bottom:132px}.street{gap:8px}.street i{width:35px}
  .district-heading{padding-bottom:32px}.district-line article{min-height:245px}
  .station-list article{grid-template-columns:1fr;gap:12px;padding:30px 0}.station-list em{grid-column:1}
  .route-steps{background:#080e25}.route-layout ol{padding-left:38px}.route-layout li::before{left:-35px}
  .bulletins article{grid-template-columns:1fr}.bulletins span{grid-row:auto;margin-bottom:10px}
  .final-terminal::before,.final-terminal::after{display:none}.footer-grid{grid-template-columns:1fr 1fr}.footer-grid>div:first-child{grid-column:1/-1}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.button{transition:none}}

/* Hero image safety override: keep media centered at natural ratio. */
.city-stage{align-items:center}
.client-display{align-self:center;height:auto;padding:0;margin-top:0;margin-bottom:0;overflow:visible;transform:none}
.client-display img{display:block;width:100%;height:auto;min-height:0;max-height:none;margin:0;padding:0;object-fit:contain;object-position:center;clip-path:none;transform:none}