:root {
  color-scheme: light dark;
  --ink: #14231d;
  --muted: #5b6a63;
  --paper: #f4f7f5;
  --surface: #ffffff;
  --surface-soft: #eaf1ed;
  --line: #cbd7d1;
  --green: #14664d;
  --green-dark: #0d4939;
  --teal: #237b74;
  --amber: #9a6500;
  --blue: #1f6282;
  --shadow: 0 1.2rem 3rem rgb(20 46 35 / 0.1);
  --radius: 1.2rem;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); }
a { color: inherit; text-underline-offset: 0.2em; }
.shell { inline-size: min(78rem, calc(100% - 2rem)); margin-inline: auto; }
.skip-link { position: fixed; z-index: 10; inset: 0.5rem auto auto 0.5rem; padding: 0.65rem 0.9rem; background: var(--surface); transform: translateY(-150%); }
.skip-link:focus { transform: none; }
:focus-visible { outline: 0.2rem solid #006dcc; outline-offset: 0.2rem; }
.site-header { border-bottom: 1px solid var(--line); background: color-mix(in srgb, var(--surface) 92%, transparent); }
.header-row { display: flex; justify-content: space-between; align-items: center; gap: 1rem; min-block-size: 5.2rem; }
.eyebrow, .kicker { margin: 0; color: var(--green); font-size: 0.76rem; font-weight: 850; letter-spacing: 0.11em; text-transform: uppercase; }
.version { margin-left: 0.35rem; color: var(--muted); font-variant-numeric: tabular-nums; letter-spacing: 0.04em; }
.brand { margin: 0.1rem 0 0; font-size: 1.15rem; font-weight: 800; }
nav { display: flex; gap: 1rem; }
nav a { display: flex; align-items: center; min-block-size: 2.75rem; padding: 0.55rem 0.75rem; border-radius: 0.6rem; font-weight: 700; }
nav a:hover { background: var(--surface-soft); }
main { padding-block: clamp(2rem, 6vw, 5rem); }
.hero { display: grid; grid-template-columns: minmax(0, 2fr) minmax(15rem, 0.8fr); gap: 2rem; align-items: end; margin-bottom: 2rem; }
h1, h2 { margin-top: 0; line-height: 1.08; }
h1 { max-width: 15ch; margin-bottom: 0.8rem; font-size: clamp(2.2rem, 6vw, 4.8rem); letter-spacing: -0.045em; }
h2 { margin-bottom: 0.7rem; font-size: clamp(1.3rem, 2.5vw, 2rem); }
h3 { margin: 0.35rem 0 0.75rem; line-height: 1.2; }
.intro { max-width: 62ch; margin: 0; color: var(--muted); font-size: clamp(1.05rem, 2vw, 1.25rem); }
.data-notice { display: grid; gap: 0.3rem; padding: 1rem 1.1rem; border: 1px solid #dbc58d; border-left: 0.35rem solid var(--amber); border-radius: 0.8rem; background: #fff8e8; color: #513b0c; }
.data-notice span { font-size: 0.9rem; }
.monitor-grid { display: grid; grid-template-columns: minmax(0, 2.4fr) minmax(17rem, 0.8fr); gap: 1rem; align-items: start; }
.network-card, .panel, .text-alternative { border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); }
.network-card { padding: clamp(1rem, 3vw, 2rem); }
.section-heading { display: flex; justify-content: space-between; align-items: start; gap: 1rem; }
.concept-badge { padding: 0.35rem 0.65rem; border-radius: 999px; background: #fff1d1; color: #694600; font-size: 0.8rem; font-weight: 800; white-space: nowrap; }
.network-scroll { overflow-x: auto; overscroll-behavior-inline: contain; scrollbar-gutter: stable; }
.network { display: block; inline-size: 100%; block-size: auto; min-block-size: 22rem; margin-top: 0.5rem; overflow: visible; }
.route { fill: none; stroke-linecap: round; stroke-linejoin: round; stroke-width: 16; }
.route-main { stroke: var(--green); }
.route-branch { stroke: var(--teal); }
.place circle { fill: var(--surface); stroke: var(--green-dark); stroke-width: 10; }
.gateway path { fill: var(--surface); stroke: var(--teal); stroke-width: 8; }
.network text { fill: var(--ink); font: 750 22px system-ui, sans-serif; }
.network .node-kind { fill: var(--muted); font-size: 15px; font-weight: 650; }
.bus-marker circle { fill: var(--surface); stroke: var(--ink); stroke-width: 4; }
.bus-marker text { font-size: 16px; font-weight: 900; }
.quality-realtime circle { stroke: var(--blue); }
.quality-estimated circle { stroke: var(--amber); stroke-dasharray: 5 4; }
.marker-empty { margin: 0.25rem 0 0.75rem; color: var(--muted); font-size: 0.9rem; }
.prototype-note { margin: 0; padding: 0.9rem 1rem; border-radius: 0.75rem; background: var(--surface-soft); color: var(--muted); font-size: 0.92rem; }
.network-summary { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 0.5rem; margin: 1rem 0 0; padding: 0; list-style: none; }
.network-summary li { display: grid; gap: 0.15rem; padding: 0.65rem; border: 1px solid var(--line); border-radius: 0.65rem; }
.network-summary span { color: var(--muted); font-size: 0.78rem; }
.side-stack { display: grid; gap: 1rem; }
.panel { padding: 1.25rem; box-shadow: none; }
.legend-list, .quality-list { display: grid; gap: 1rem; margin: 1.2rem 0 0; padding: 0; list-style: none; }
.legend-list li, .quality-list li { display: grid; grid-template-columns: 2.5rem 1fr; gap: 0.8rem; align-items: center; }
.legend-list strong, .legend-list small, .quality-list strong, .quality-list small { display: block; }
.legend-list small, .quality-list small { color: var(--muted); }
.legend-symbol { display: inline-block; justify-self: center; }
.place-symbol { inline-size: 1.3rem; block-size: 1.3rem; border: 0.3rem solid var(--green-dark); border-radius: 50%; }
.gateway-symbol { inline-size: 1.25rem; block-size: 1.25rem; border: 0.25rem solid var(--teal); transform: rotate(45deg); }
.route-symbol { inline-size: 2.2rem; block-size: 0.5rem; border-radius: 999px; background: var(--green); }
.quality { display: grid; place-items: center; inline-size: 2.2rem; block-size: 2.2rem; border-radius: 50%; color: white; font-weight: 900; }
.scheduled { background: #626d68; }
.realtime { background: var(--blue); }
.estimated { background: var(--amber); }
.text-alternative { margin-top: 1rem; padding: clamp(1rem, 3vw, 2rem); box-shadow: none; }
.gateway-section { margin-top: 1rem; padding: clamp(1rem, 3vw, 2rem); border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.gateway-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0.75rem; }
.gateway-card { padding: 1rem; border: 1px solid var(--line); border-radius: 0.8rem; background: var(--surface-soft); }
.trip-list-section { margin-top: 1rem; padding: clamp(1rem, 3vw, 2rem); border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.trip-list { display: grid; gap: 0.75rem; margin: 0; padding: 0; list-style: none; }
.trip-list article { padding: 1rem; border: 1px solid var(--line); border-radius: 0.8rem; }
.trip-list dl, .trip-list dl div { display: flex; gap: 0.5rem; }
.trip-list dl { flex-wrap: wrap; margin: 0; }
.trip-list dt { color: var(--muted); }
.trip-list dd { margin: 0; font-weight: 750; }
dialog { max-inline-size: min(36rem, calc(100% - 2rem)); border: 1px solid var(--line); border-radius: 1rem; background: var(--surface); color: var(--ink); }
dialog::backdrop { background: rgb(0 0 0 / 0.55); }
button { min-block-size: 2.75rem; padding: 0.55rem 0.8rem; border: 1px solid var(--line); border-radius: 0.55rem; background: var(--surface); color: var(--ink); font: inherit; font-weight: 750; cursor: pointer; }
.empty-message { display: grid; gap: 0.25rem; color: var(--muted); }
.state-badge { max-inline-size: 28rem; padding: 0.4rem 0.7rem; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); font-size: 0.82rem; }
.data-state { display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin-bottom: 1rem; padding: 1rem; border: 1px solid var(--line); border-left: 0.35rem solid var(--blue); border-radius: 0.8rem; background: var(--surface); }
.data-state h2, .data-state p { margin-bottom: 0.25rem; }
.state-stale, .state-partial { border-left-color: var(--amber); }
.state-offline { border-left-color: #a33535; }
.text-alternative ul { margin-bottom: 0; padding-left: 1.25rem; }
.text-alternative li + li { margin-top: 0.45rem; }
footer { margin-top: 2rem; padding-block: 1.5rem; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.9rem; }

@media (max-width: 52rem) {
  .hero, .monitor-grid, .gateway-grid { grid-template-columns: 1fr; }
  .data-state { align-items: stretch; flex-direction: column; }
  .network { min-block-size: 18rem; }
  .network-summary { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 34rem) {
  .shell { inline-size: min(100% - 1rem, 78rem); }
  .header-row, .section-heading { align-items: stretch; flex-direction: column; }
  .header-row { padding-block: 0.8rem; }
  nav a { justify-content: center; min-block-size: 2.75rem; }
  .concept-badge { align-self: start; white-space: normal; }
  .network { min-inline-size: 44rem; min-block-size: 15rem; }
  .network-summary { grid-template-columns: 1fr; }
}

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

@media (prefers-color-scheme: dark) {
  :root { --ink: #edf4f0; --muted: #b3c2ba; --paper: #101713; --surface: #19231e; --surface-soft: #22372e; --line: #3d5047; --green: #65c6a2; --green-dark: #86ddbd; --teal: #70cbc4; --shadow: none; }
  .data-notice { border-color: #806722; background: #302810; color: #f4dda4; }
  .concept-badge { background: #3d3111; color: #f2d58c; }
}

@media (forced-colors: active) {
  .route-main, .route-branch { stroke: CanvasText; }
  .place circle, .gateway path { fill: Canvas; stroke: CanvasText; }
  .concept-badge, .data-notice, .quality { border: 1px solid CanvasText; color: CanvasText; background: Canvas; }
}