/* Layout idea: station-signage look. Route picker on top, then a depth diagram (floors as bands) beside numbered steps; each step shows the exact Japanese sign to look for. */
:root{
  --bg:#f3f4f6;
  --surface:#ffffff;
  --ink:#121a2b;
  --muted:#5b6476;
  --line:#d9dde5;
  --accent:#f2b705;      /* signage yellow */
  --sign:#1b2438;        /* sign panel navy */
  --sign-ink:#ffffff;
  --display:"Barlow Condensed","Arial Narrow",sans-serif;
  --body:"Barlow","Noto Sans JP",system-ui,sans-serif;
  --jp:"Noto Sans JP","Hiragino Sans","Yu Gothic",sans-serif;
  color-scheme:light;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#0e1320; --surface:#161d2e; --ink:#e9edf5; --muted:#9aa4b8; --line:#2a3348;
    --accent:#f5c22e; --sign:#0a0f1a; --sign-ink:#ffffff; color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#0e1320; --surface:#161d2e; --ink:#e9edf5; --muted:#9aa4b8; --line:#2a3348;
  --accent:#f5c22e; --sign:#0a0f1a; --sign-ink:#ffffff; color-scheme:dark;
}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--ink);font-family:var(--body);font-size:16px;line-height:1.5}
a{color:inherit}
button{font:inherit;color:inherit}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px}

header.top{background:var(--sign);color:var(--sign-ink);padding:18px 16px 0}
.wrap{max-width:1040px;margin:0 auto}
.brand{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap}
.brand h1{font-family:var(--display);font-weight:700;font-size:34px;letter-spacing:.02em;margin:0;line-height:1}
.brand h1 span{color:var(--accent)}
.brand .jp{font-family:var(--jp);font-size:14px;opacity:.75}
.tagline{margin:6px 0 14px;opacity:.85;font-size:15px;max-width:60ch}
.stations{display:flex;gap:4px;overflow-x:auto;scrollbar-width:none}
.stations button{background:transparent;border:0;padding:10px 14px;border-radius:8px 8px 0 0;font-family:var(--display);font-size:18px;font-weight:600;letter-spacing:.03em;color:var(--sign-ink);opacity:.6;cursor:pointer;white-space:nowrap}
.stations button[aria-selected="true"]{background:var(--bg);color:var(--ink);opacity:1}
.stations button small{font-family:var(--body);font-size:11px;font-weight:500;margin-left:6px;opacity:.8}

main{padding:20px 16px 40px}
.section-label{font-family:var(--display);font-size:15px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:0 0 10px}

.routes{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:10px;margin-bottom:24px}
.route-card{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:12px;text-align:left;cursor:pointer;display:grid;gap:8px}
.route-card:hover{border-color:var(--muted)}
.route-card[aria-pressed="true"]{border-color:var(--ink);box-shadow:inset 0 0 0 1px var(--ink)}
.pair{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.chip{display:inline-flex;align-items:center;gap:6px;font-weight:600;font-size:14px;line-height:1.2}
.dot{width:12px;height:12px;border-radius:3px;flex:none}
.arrow{color:var(--muted)}
.meta{display:flex;gap:6px;flex-wrap:wrap}
.pill{font-size:12px;font-weight:600;padding:2px 8px;border-radius:999px;background:var(--bg);color:var(--muted);border:1px solid var(--line);font-variant-numeric:tabular-nums}
.pill.gate{color:#8a5a00;background:#fff4d1;border-color:#f0d58a}
.pill.nogate{color:#1d6b3a;background:#e2f5e8;border-color:#a9dcb9}
.pill.soon{color:var(--muted)}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .pill.gate{color:#ffd77a;background:#3a2e10;border-color:#5c4718}:root:not([data-theme="light"]) .pill.nogate{color:#8fe0aa;background:#123222;border-color:#1f5537}}
:root[data-theme="dark"] .pill.gate{color:#ffd77a;background:#3a2e10;border-color:#5c4718}
:root[data-theme="dark"] .pill.nogate{color:#8fe0aa;background:#123222;border-color:#1f5537}

.detail{background:var(--surface);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.detail-head{padding:16px;border-bottom:1px solid var(--line);display:grid;gap:10px}
.detail-head h2{font-family:var(--display);font-size:28px;font-weight:700;margin:0;line-height:1.1;text-wrap:balance}
.facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(105px,1fr));gap:8px}
.fact{background:var(--bg);border-radius:8px;padding:8px 10px}
.fact b{display:block;font-family:var(--display);font-size:19px;font-weight:700;line-height:1.1;font-variant-numeric:tabular-nums}
.fact span{font-size:13px;color:var(--muted)}
.board{display:flex;gap:10px;align-items:center;background:var(--sign);color:var(--sign-ink);border-radius:8px;padding:10px 12px;font-size:14px}
.board strong{font-family:var(--display);font-size:20px;color:var(--accent);white-space:nowrap}

.body{display:grid;grid-template-columns:300px 1fr;gap:0}
@media (max-width:760px){.body{grid-template-columns:1fr}}
.diagram{padding:16px;border-right:1px solid var(--line);background:var(--bg)}
@media (max-width:760px){.diagram{border-right:0;border-bottom:1px solid var(--line)}}
.diagram svg{width:100%;height:auto;display:block}
.diagram .cap{font-size:12px;color:var(--muted);margin-top:6px}

.steps{list-style:none;margin:0;padding:8px 0;counter-reset:s}
.step{display:grid;grid-template-columns:40px 1fr;gap:12px;padding:12px 16px;cursor:pointer;border-left:4px solid transparent}
.step[aria-current="step"]{background:var(--bg);border-left-color:var(--accent)}
.num{width:32px;height:32px;border-radius:50%;background:var(--ink);color:var(--surface);display:grid;place-items:center;font-family:var(--display);font-weight:700;font-size:18px}
.step[aria-current="step"] .num{background:var(--accent);color:#111}
.floor{font-family:var(--display);font-weight:600;font-size:13px;letter-spacing:.06em;color:var(--muted);text-transform:uppercase}
.step p{margin:2px 0 0}
.signcard{display:inline-grid;margin-top:8px;background:var(--sign);color:var(--sign-ink);border-radius:6px;padding:6px 12px 7px;border-bottom:4px solid var(--accent);max-width:100%}
.signcard .s-jp{font-family:var(--jp);font-weight:700;font-size:17px;line-height:1.3}
.signcard .s-en{font-size:12px;opacity:.85;letter-spacing:.02em}
.signlabel{font-size:11px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-top:8px}
.warn{margin-top:8px;font-size:14px;padding:6px 10px;border-radius:6px;background:#fff4d1;color:#6b4700}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .warn{background:#3a2e10;color:#ffe3a1}}
:root[data-theme="dark"] .warn{background:#3a2e10;color:#ffe3a1}
.photo{margin-top:8px;font-size:12px;color:var(--muted);border:1px dashed var(--line);border-radius:6px;padding:4px 8px;display:inline-block}

.stepnav{display:flex;gap:8px;padding:12px 16px 16px;border-top:1px solid var(--line)}
.stepnav button{flex:1;padding:10px;border-radius:8px;border:1px solid var(--line);background:var(--surface);font-weight:600;cursor:pointer}
.stepnav button.primary{background:var(--ink);color:var(--surface);border-color:var(--ink)}
.stepnav button:disabled{opacity:.4;cursor:default}

.overview{padding:16px;display:grid;gap:10px;max-width:68ch}
.overview p{margin:0}
.dest{padding:0 16px 16px;display:grid;gap:6px}
.dest-row{display:flex;gap:10px;align-items:baseline;font-size:14px;flex-wrap:wrap}
.dest-row b{font-family:var(--display);font-size:16px;min-width:92px}

.videos{padding:4px 16px 16px;border-top:1px solid var(--line);padding-top:14px}
.vlist{display:grid;gap:8px}
.vcard{display:flex;gap:12px;align-items:center;padding:10px 12px;border:1px solid var(--line);border-radius:8px;text-decoration:none;background:var(--surface)}
.vcard:hover{border-color:var(--muted)}
.play{flex:none;width:40px;height:28px;border-radius:7px;background:#e62117;position:relative}
.play::after{content:"";position:absolute;left:16px;top:8px;border-left:11px solid #fff;border-top:6px solid transparent;border-bottom:6px solid transparent}
.vtext{display:grid;gap:2px;min-width:0}
.vtitle{font-weight:600;font-size:15px;line-height:1.3}
.vmeta{font-size:12px;color:var(--muted)}
.vnote{font-size:12px;color:var(--muted);margin:8px 0 0}
.tips{margin-top:24px;display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:10px}
.tip{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:12px 14px}
.tip h3{margin:0 0 4px;font-family:var(--display);font-size:19px;font-weight:700}
.tip p{margin:0;font-size:14px;color:var(--muted)}
footer{padding:0 16px 32px;font-size:13px;color:var(--muted)}
footer .wrap{border-top:1px solid var(--line);padding-top:14px}
@media (prefers-reduced-motion: no-preference){.step,.route-card{transition:background .15s,border-color .15s}}

.logo{text-decoration:none;color:inherit}
.h1like{font-family:var(--display);font-weight:700;font-size:34px;letter-spacing:.02em;line-height:1}
.h1like span{color:var(--accent)}
.stations .st{padding:10px 14px;border-radius:8px 8px 0 0;font-family:var(--display);font-size:18px;font-weight:600;letter-spacing:.03em;color:var(--sign-ink);opacity:.55;white-space:nowrap;text-decoration:none}
.stations .st.on{background:var(--bg);color:var(--ink);opacity:1}
.stations .st small{font-family:var(--body);font-size:11px;font-weight:500;margin-left:6px;opacity:.8}
.crumbs{font-size:13px;color:var(--muted);margin-bottom:12px}
.crumbs a{color:var(--muted)}
.page-h1{font-family:var(--display);font-size:34px;line-height:1.1;margin:0 0 8px;text-wrap:balance}
.detail-head h1{font-family:var(--display);font-size:28px;font-weight:700;margin:0;line-height:1.1;text-wrap:balance}
.lede{color:var(--muted);margin:0 0 18px;max-width:65ch}
.detail-head .lede{margin:0}
a.route-card{text-decoration:none;color:inherit}
.section-label.pad{padding:14px 16px 0;margin:0}
.node{cursor:pointer}
.node circle{fill:var(--ink);stroke:var(--surface);stroke-width:3}
.node text{font-size:12px;font-family:"Barlow Condensed",sans-serif;font-weight:700;fill:var(--surface)}
.node.on circle{fill:var(--accent)}
.node.on text{fill:#111}
.faq{padding:14px 16px 18px;border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line);padding:10px 0}
.faq summary{font-weight:600;cursor:pointer}
.faq p{margin:6px 0 0;color:var(--muted)}
.more{font-weight:600}
.prose{max-width:70ch}
.prose h2{font-family:var(--display);font-size:22px;margin:24px 0 6px}
.prose p{margin:0 0 10px}
.prose hr{border:0;border-top:1px solid var(--line);margin:28px 0}
footer p{margin:0 0 8px}
.fnav a{color:var(--muted)}