:root{
  --paper:#f4f7f8;
  --white:#fff;
  --ink:#101417;
  --muted:#5d6870;
  --line:#cbd3d8;
  --red:#e43d3d;
  --blue:#1769d2;
  --green:#009b67;
  --yellow:#f2bd23;
  --rail:8px;
  --sans:"Microsoft YaHei UI","Noto Sans SC",Arial,sans-serif;
  --display:"Bahnschrift SemiCondensed","Microsoft YaHei UI",sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;color:var(--ink);background:var(--paper);font-family:var(--sans);line-height:1.65}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.metro-shell{width:min(1240px,calc(100% - 40px));margin-inline:auto}
.metro-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);border-bottom:2px solid var(--ink);backdrop-filter:blur(14px)}
.metro-nav{min-height:76px;display:flex;align-items:center;gap:28px}
.metro-brand{display:inline-flex;align-items:center;gap:10px;font-family:var(--display);font-size:22px;font-weight:900;letter-spacing:.04em;white-space:nowrap}
.metro-brand img{display:block;width:34px;height:34px;object-fit:contain}
.metro-links{margin-left:auto;display:flex;align-items:center;gap:6px}
.metro-links a{padding:9px 13px;border-bottom:3px solid transparent;font-size:14px;font-weight:800}
.metro-links a:nth-child(1):hover{border-color:var(--red)}
.metro-links a:nth-child(2):hover{border-color:var(--blue)}
.metro-links a:nth-child(3):hover{border-color:var(--green)}
.metro-links a:nth-child(4):hover{border-color:var(--yellow)}
.metro-links a:nth-child(5):hover{border-color:var(--red)}
.metro-cta{display:inline-flex;align-items:center;justify-content:center;min-width:126px;min-height:44px;padding:0 20px;color:#fff;background:var(--ink);border:2px solid var(--ink);border-radius:2px;font-weight:900;white-space:nowrap;word-break:keep-all;writing-mode:horizontal-tb;transition:background .18s,color .18s,transform .18s}
.metro-cta:hover{background:var(--blue);border-color:var(--blue);transform:translateY(-2px)}
a:focus-visible,summary:focus-visible{outline:4px solid var(--yellow);outline-offset:4px}

.network-hero{position:relative;min-height:calc(100svh - 76px);overflow:hidden;background-color:var(--white);background-image:linear-gradient(#e7ecef 1px,transparent 1px),linear-gradient(90deg,#e7ecef 1px,transparent 1px);background-size:32px 32px}
.network-hero::after{content:"";position:absolute;inset:0;pointer-events:none;background:radial-gradient(circle at 50% 51%,transparent 0 27%,rgba(255,255,255,.72) 62%,#fff 92%)}
.hero-network{position:relative;z-index:1;min-height:calc(100svh - 76px);display:grid;place-items:center;padding:56px 0 68px}
.map-label{position:absolute;z-index:3;padding:5px 10px;background:var(--ink);color:#fff;font-size:11px;font-weight:900;letter-spacing:.1em}
.map-label.top{top:24px;left:20px}.map-label.bottom{right:20px;bottom:24px}
.route{position:absolute;z-index:0;border-radius:99px}
.route::before,.route::after{content:"";position:absolute;width:24px;height:24px;background:#fff;border:7px solid currentColor;border-radius:50%}
.route-red{left:-4%;right:10%;top:24%;height:var(--rail);color:var(--red);background:currentColor;transform:rotate(7deg)}
.route-red::before{left:14%;top:-8px}.route-red::after{right:7%;top:-8px}
.route-blue{left:9%;right:-5%;bottom:22%;height:var(--rail);color:var(--blue);background:currentColor;transform:rotate(-8deg)}
.route-blue::before{left:8%;top:-8px}.route-blue::after{right:18%;top:-8px}
.route-green{top:-8%;bottom:7%;left:29%;width:var(--rail);color:var(--green);background:currentColor;transform:rotate(-5deg)}
.route-green::before{left:-8px;top:17%}.route-green::after{left:-8px;bottom:8%}
.route-yellow{top:2%;bottom:-7%;right:25%;width:var(--rail);color:var(--yellow);background:currentColor;transform:rotate(8deg)}
.route-yellow::before{left:-8px;top:12%}.route-yellow::after{left:-8px;bottom:16%}
.station-note{position:absolute;z-index:4;display:flex;align-items:center;gap:9px;padding:7px 10px;background:#fff;border:2px solid var(--ink);font-size:12px;font-weight:900;box-shadow:4px 4px 0 var(--ink)}
.station-note i{width:13px;height:13px;border:4px solid currentColor;border-radius:50%;background:#fff}
.station-device{left:7%;top:18%;color:var(--red)}
.station-install{left:18%;bottom:16%;color:var(--blue)}
.station-authorize{right:8%;top:17%;color:var(--yellow)}
.station-connect{right:8%;bottom:16%;color:var(--green)}

.interchange{position:relative;z-index:5;width:min(850px,78vw);display:grid;grid-template-columns:1.06fr .94fr;align-items:center;border:4px solid var(--ink);background:#fff;box-shadow:14px 14px 0 var(--ink)}
.interchange::before{content:"";position:absolute;inset:-18px;border:4px solid var(--ink);border-radius:30px;pointer-events:none}
.interchange-copy{padding:clamp(30px,5vw,62px);border-right:4px solid var(--ink)}
.guide-sign{display:inline-flex;align-items:center;gap:8px;margin:0 0 18px;padding:7px 10px;background:var(--ink);color:#fff;font-size:12px;font-weight:900;letter-spacing:.08em}
.guide-sign i{width:10px;height:10px;background:var(--yellow);border-radius:50%}
.interchange h1{max-width:10ch;margin:0;font-family:var(--display);font-size:clamp(42px,5.8vw,78px);line-height:1.03;letter-spacing:-.045em}
.hero-copyline{max-width:33em;margin:22px 0;color:var(--muted);font-size:17px}
.hero-actions{display:flex;flex-wrap:wrap;align-items:center;gap:14px}
.flow-caption{font-size:12px;font-weight:800;color:var(--muted)}
.interchange-media{position:relative;align-self:center;height:auto;margin:0;padding:0;overflow:visible;transform:none}
.interchange-media::before{content:"核心换乘站";position:absolute;z-index:2;top:18px;right:18px;padding:6px 9px;background:var(--blue);color:#fff;font-size:11px;font-weight:900}
.interchange-media 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}
.line-key{position:absolute;z-index:5;left:50%;bottom:21px;transform:translateX(-50%);display:flex;background:#fff;border:2px solid var(--ink)}
.line-key span{display:flex;align-items:center;gap:7px;padding:6px 9px;border-right:1px solid var(--line);font-size:10px;font-weight:900;white-space:nowrap}
.line-key span:last-child{border:0}.line-key i{width:18px;height:5px;background:var(--key)}

.route-section{position:relative;padding:clamp(86px,11vw,150px) 0;overflow:hidden}
.route-heading{display:grid;grid-template-columns:160px 1fr;gap:30px;align-items:start;margin-bottom:68px}
.line-badge{display:inline-flex;align-items:center;justify-content:center;width:72px;height:72px;border-radius:50%;background:var(--line-color);color:#fff;border:7px solid #fff;box-shadow:0 0 0 3px var(--line-color);font-family:var(--display);font-size:21px;font-weight:900}
.route-heading small{display:block;margin-top:16px;font-size:12px;font-weight:900;letter-spacing:.12em}
.route-heading h2{max-width:16ch;margin:0;font-family:var(--display);font-size:clamp(38px,5vw,66px);line-height:1.05;letter-spacing:-.035em}
.route-heading p{max-width:62ch;margin:18px 0 0;color:var(--muted)}
.process-line{position:relative;display:grid;grid-template-columns:repeat(6,1fr);gap:0}
.process-line::before{content:"";position:absolute;left:7%;right:7%;top:29px;height:var(--rail);background:var(--line-color)}
.process-stop{position:relative;z-index:1;min-width:0;padding:0 12px;text-align:center}
.stop-dot{display:block;width:58px;height:58px;margin:0 auto 22px;border:10px solid var(--line-color);border-radius:50%;background:#fff}
.process-stop:nth-child(3) .stop-dot{border-color:var(--yellow);box-shadow:0 0 0 8px var(--ink)}
.stop-code{display:block;color:var(--line-color);font-family:Consolas,monospace;font-size:11px;font-weight:900}
.process-stop h3{margin:5px 0 7px;font-size:18px}.process-stop p{margin:0;color:var(--muted);font-size:13px}

.capability-route{--line-color:var(--red);background:#fff;border-top:2px solid var(--ink);border-bottom:2px solid var(--ink)}
.branch-board{display:grid;grid-template-columns:1fr 1.25fr;gap:0;border:3px solid var(--ink);background:#fff}
.branch-index{padding:34px;background:var(--ink);color:#fff}
.branch-index h3{margin:0 0 26px;font-family:var(--display);font-size:34px}
.branch-index ol{list-style:none;margin:0;padding:0}
.branch-index li{display:grid;grid-template-columns:42px 1fr;gap:12px;padding:17px 0;border-top:1px solid #ffffff45}
.branch-index b{color:var(--yellow);font-family:Consolas,monospace}
.branch-index span{font-weight:800}
.branch-diagram{position:relative;display:grid;gap:0;padding:28px 34px 28px 90px}
.branch-diagram::before{content:"";position:absolute;left:54px;top:48px;bottom:48px;width:var(--rail);background:var(--red)}
.branch-row{position:relative;display:grid;grid-template-columns:1fr 1.3fr;gap:24px;align-items:center;min-height:116px;border-bottom:1px solid var(--line)}
.branch-row:last-child{border:0}
.branch-row::before{content:"";position:absolute;left:-49px;width:28px;height:28px;background:#fff;border:8px solid var(--red);border-radius:50%}
.branch-row h3,.branch-row p{margin:0}.branch-row h3{font-size:20px}.branch-row p{color:var(--muted)}

.platform-route{--line-color:var(--blue)}
.platform-board{border-top:8px solid var(--blue);background:#fff}
.platform-row{display:grid;grid-template-columns:120px 1fr 180px;align-items:center;gap:24px;min-height:112px;padding:20px 28px;border-bottom:2px solid var(--ink)}
.platform-row:first-child{border-top:2px solid var(--ink)}
.platform-code{display:flex;align-items:center;gap:12px;font:900 18px var(--display)}
.platform-code i{width:34px;height:34px;border:8px solid var(--blue);border-radius:50%;background:#fff}
.platform-row h3,.platform-row p{margin:0}.platform-row h3{font-size:21px}.platform-row p{color:var(--muted)}
.direction{justify-self:end;padding:6px 10px;background:var(--ink);color:#fff;font-size:12px;font-weight:900}

.help-route{--line-color:var(--green);background:#eaf4f0}
.help-layout{display:grid;grid-template-columns:.8fr 1.2fr;gap:70px;align-items:start}
.help-terminal{position:sticky;top:116px;padding:30px;border:3px solid var(--ink);background:#fff;box-shadow:10px 10px 0 var(--green)}
.help-terminal .terminal-symbol{display:grid;place-items:center;width:96px;height:96px;margin-bottom:32px;border:12px solid var(--green);border-radius:50%;font:900 42px var(--display)}
.help-terminal h3{margin:0 0 10px;font-family:var(--display);font-size:32px}.help-terminal p{margin:0 0 18px;color:var(--muted)}
.text-link{font-weight:900;text-decoration:underline;text-decoration-color:var(--green);text-decoration-thickness:3px;text-underline-offset:5px}
.faq-track{position:relative;padding-left:70px}
.faq-track::before{content:"";position:absolute;left:23px;top:24px;bottom:24px;width:var(--rail);background:var(--green)}
.faq-track details{position:relative;margin-bottom:18px;border:3px solid var(--ink);background:#fff}
.faq-track details::before{content:"";position:absolute;left:-62px;top:21px;width:24px;height:24px;border:8px solid var(--green);border-radius:50%;background:#fff}
.faq-track summary{cursor:pointer;list-style:none;padding:21px 54px 21px 22px;font-weight:900}
.faq-track summary::after{content:"+";position:absolute;right:20px;font-size:24px;line-height:1}
.faq-track details[open] summary::after{content:"−"}
.faq-track details p{margin:0;padding:0 22px 22px;color:var(--muted)}

.final-station{padding:80px 0;background:var(--yellow);border-top:3px solid var(--ink)}
.final-board{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:28px;padding:30px;background:#fff;border:4px solid var(--ink);box-shadow:12px 12px 0 var(--ink)}
.final-roundel{display:grid;place-items:center;width:82px;height:82px;border:12px solid var(--red);border-radius:50%;font:900 22px var(--display)}
.final-board h2{margin:0 0 5px;font:900 clamp(30px,4vw,48px)/1.05 var(--display)}.final-board p{margin:0;color:var(--muted)}
.metro-footer{padding:52px 0 24px;color:#fff;background:var(--ink)}
.footer-routes{display:grid;grid-template-columns:1.4fr .8fr .8fr;gap:40px}
.footer-routes h2,.footer-routes h3{margin-top:0}.footer-routes p{max-width:38em;color:#b9c2c8}
.footer-routes a{display:block;width:max-content;margin:8px 0;color:#dce2e5}
.footer-routes a:hover{text-decoration:underline}.copyright{margin-top:30px;padding-top:18px;border-top:1px solid #ffffff35;color:#9da8ae;font-size:12px}

@media(max-width:900px){
  .metro-nav{flex-wrap:wrap;padding:12px 0}.metro-links{order:3;width:100%;margin:0;overflow-x:auto}.metro-nav>.metro-cta{margin-left:auto}
  .network-hero,.hero-network{min-height:auto}.hero-network{padding:100px 0}.interchange{width:min(680px,82vw);grid-template-columns:1fr}.interchange-copy{border-right:0;border-bottom:4px solid var(--ink)}.interchange-media{max-width:480px;justify-self:center}
  .station-note{display:none}.line-key{bottom:12px}
  .process-line{grid-template-columns:repeat(3,1fr);row-gap:44px}.process-line::before{display:none}.process-stop{border-top:7px solid var(--line-color);padding-top:18px}
  .branch-board,.help-layout{grid-template-columns:1fr}.help-terminal{position:static}.route-heading{grid-template-columns:110px 1fr}
}
@media(max-width:620px){
  .metro-shell{width:min(100% - 24px,1240px)}.metro-nav>.metro-cta{display:none}.metro-links{gap:0}.metro-links a{padding:7px 9px}
  .hero-network{padding:90px 0}.interchange{width:calc(100% - 46px);box-shadow:8px 8px 0 var(--ink)}.interchange::before{inset:-12px;border-radius:22px}.interchange-copy{padding:28px 22px}.interchange h1{font-size:clamp(40px,12vw,56px)}.line-key{display:none}
  .route-heading{grid-template-columns:1fr;gap:18px}.route-heading small{display:inline-block;margin:0 0 0 14px}.process-line{grid-template-columns:1fr}.process-stop{display:grid;grid-template-columns:58px 1fr;column-gap:18px;text-align:left}.stop-dot{grid-row:1/4;margin:0}.process-stop h3{margin-top:0}
  .branch-index{padding:26px}.branch-diagram{padding:20px 20px 20px 68px}.branch-diagram::before{left:37px}.branch-row{grid-template-columns:1fr;gap:4px;padding:18px 0}.branch-row::before{left:-43px}
  .platform-row{grid-template-columns:1fr;gap:7px;padding:22px}.direction{justify-self:start}.help-layout{gap:42px}.faq-track{padding-left:48px}.faq-track::before{left:12px}.faq-track details::before{left:-50px}
  .final-board{grid-template-columns:1fr;justify-items:start}.footer-routes{grid-template-columns:1fr}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.metro-cta{transition:none}}

/* Hero image safety must remain the final visual override. */
.network-hero .hero-network{align-items:center}
.network-hero .interchange-media{align-self:center;height:auto;padding:0;margin-top:0;margin-bottom:0;overflow:visible;transform:none}
.network-hero .interchange-media img{display:block;width:100%;height:auto;min-width:0;min-height:0;max-height:none;margin:0;padding:0;object-fit:contain;object-position:center;clip-path:none;transform:none}