@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;450;500;550;600;700&family=Manrope:wght@400;500;600;700;800&display=swap');
:root {
  --paper: #f6f5f0; --white: #fdfdf9; --ink: #22303a; --muted: #7a8288; --line: #dfe0d8; --soft: #eef0ea;
  --accent: #c8102e; --navy: #1b2a6b; --teal: #00a99d; --closed: #dc2626; --gold: #d97706;
  --map-bg: #f4f5f2; --mono: 'Courier New', monospace;
  color-scheme: light;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: clip; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 14px/1.6 'DM Sans', system-ui, sans-serif; font-synthesis: none; }
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; border: 0; background: none; }
button:hover:not(:disabled) { filter: brightness(.95); }
a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; }
button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
/* language: both texts live in the HTML; only the chosen one shows */
html[data-lang="en"] [lang="id"], html[data-lang="id"] [lang="en"] { display: none !important; }

/* top bar */
.topbar { height: 60px; border-bottom: 1px solid var(--line); display: flex; align-items: center; gap: 20px; padding: 0 max(4vw, 24px); background: var(--paper); position: sticky; top: 0; z-index: 20; }
.brand { font: 800 24px 'Manrope', sans-serif; letter-spacing: -1.2px; display: flex; align-items: center; }
.brand:hover { text-decoration: none; }
.brand svg { width: 26px; height: 26px; fill: none; stroke: var(--accent); stroke-width: 2; stroke-linecap: round; margin-right: 10px; }
.brand svg circle { fill: var(--paper); }
.brand-dot { color: var(--accent); }
.top-tag, .eyebrow, .specimen-id, .specimen > span:last-child, .quiet-label, .live-badge, .section-number { font: 10px var(--mono); letter-spacing: 1.1px; }
.top-tag { color: var(--muted); border-left: 1px solid var(--line); padding-left: 22px; }
nav { margin-left: auto; display: flex; align-items: center; gap: 20px; }
nav a { font-size: 12px; font-weight: 500; white-space: nowrap; }
.lang { display: inline-flex; border: 1px solid var(--line); border-radius: 6px; overflow: hidden; }
.lang button { font: 600 11px var(--mono); padding: 5px 9px; color: var(--muted); }
.lang button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }

main { max-width: 1490px; margin: auto; padding: 0 max(4vw, 24px); }
.eyebrow { display: flex; align-items: center; gap: 8px; color: var(--accent); font-weight: 600; }
.live-dot { display: inline-block; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); flex: none; animation: blink 1.6s infinite; }
@keyframes blink { 50% { opacity: .25; } }

/* hero */
.intro { display: flex; justify-content: space-between; align-items: center; gap: 30px; padding: 52px 0 40px; }
h1 { font: 500 clamp(34px, 3.6vw, 54px)/1.14 'Manrope', sans-serif; letter-spacing: -2.2px; margin: 16px 0; }
.intro p { font-size: 14px; line-height: 1.75; color: #6f7880; margin: 0; max-width: 62ch; }
.intro p strong { color: var(--ink); font-weight: 550; }
.hero-hook { display: flex; align-items: center; gap: 26px; margin-top: 26px; flex-wrap: wrap; }
.cta { display: inline-flex; align-items: center; gap: 10px; background: var(--accent); color: #fff; border-radius: 6px; padding: 13px 20px; font-size: 13px; font-weight: 500; }
.cta:hover { text-decoration: none; filter: brightness(.93); }
.hero-stats { list-style: none; margin: 0; padding: 0; display: flex; gap: 22px; }
.hero-stats li { font-size: 10px; color: #8a9096; line-height: 1.4; max-width: 110px; }
.hero-stats b { display: block; font: 600 17px 'Manrope', sans-serif; letter-spacing: -.6px; color: var(--ink); }
.specimen { width: 300px; text-align: center; color: #6f767c; margin-right: 20px; transform: rotate(-3deg); flex: none; }
.specimen svg { width: 250px; height: 135px; display: block; margin: 14px auto 10px; }
.specimen-id { font-size: 8px; border-bottom: 1px solid #cfd2c8; padding-bottom: 8px; display: inline-block; }
.specimen > span:last-child { font-size: 8px; }

/* panels */
.workspace { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(360px, .75fr); gap: 22px; align-items: start; scroll-margin-top: 76px; }
.panel { background: var(--white); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.panel-heading { display: flex; justify-content: space-between; align-items: center; padding: 20px 22px 0; gap: 10px; }
.panel-heading > div { display: flex; align-items: center; gap: 12px; }
.section-number { color: #9a9f94; border: 1px solid var(--line); border-radius: 4px; padding: 4px 5px; letter-spacing: 0; }
h2 { font-size: 15px; font-weight: 550; letter-spacing: -.35px; margin: 0; }
.panel-description { font-size: 11px; color: #858c92; margin: 8px 22px 14px; line-height: 1.6; }
.quiet-label { color: #99a08f; letter-spacing: .4px; }
.live-badge { font-size: 8px; color: var(--accent); display: flex; align-items: center; gap: 6px; white-space: nowrap; }
.seg { display: inline-flex; background: #e6e8e0; padding: 3px; border-radius: 6px; }
.seg button { font-size: 11px; padding: 6px 12px; border-radius: 4px; color: #6b7570; }
.seg button[aria-pressed="true"] { background: var(--white); color: var(--ink); box-shadow: 0 1px 3px #0002; }
.text-button { padding: 0; font-size: 12px; font-weight: 500; }
.text-button span:last-child { margin-left: 6px; }

/* map panel */
.map { position: relative; margin: 0 14px; }
.tip { position: absolute; pointer-events: none; background: var(--ink); color: var(--paper); border-radius: 6px; padding: 6px 9px; font-size: 12px; white-space: nowrap; transform: translate(-50%, -130%); z-index: 5; }
.tip b { display: block; font-size: 13px; }
.tip .lines { display: flex; gap: 3px; margin: 3px 0; }
.tip .lines i, #list .modes i { font: 700 10px/1 'DM Sans', sans-serif; font-style: normal; color: #fff; background: var(--c); border-radius: 3px; padding: 2px 4px; min-width: 14px; text-align: center; }
.legend { margin: 10px 22px 0; padding: 0; list-style: none; display: flex; gap: 10px 12px; flex-wrap: wrap; font-size: 11px; color: var(--muted); }
.legend i { display: inline-block; width: 16px; height: 4px; background: var(--c); vertical-align: middle; margin-right: 5px; border-radius: 2px; }
.legend i.dash { background: repeating-linear-gradient(90deg, var(--c) 0 4px, transparent 4px 7px); }
.filters { display: flex; flex-wrap: wrap; gap: 10px 22px; align-items: center; border-top: 1px solid var(--soft); margin-top: 14px; padding: 14px 22px 18px; font-size: 12px; }
.filters .lbl { color: var(--muted); font: 9px var(--mono); letter-spacing: .8px; text-transform: uppercase; margin-right: 4px; }
.modes { border: 0; padding: 0; margin: 0; display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.modes label { display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; border: 1px solid var(--line); border-radius: 999px; cursor: pointer; user-select: none; background: var(--white); }
.modes label::before { content: ''; width: 9px; height: 9px; border-radius: 50%; background: var(--c); }
.modes label:has(input:not(:checked)) { opacity: .45; text-decoration: line-through; }
.modes input { position: absolute; opacity: 0; pointer-events: none; }
.must { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.must select { background: var(--white); border: 1px solid var(--line); border-radius: 6px; padding: 5px 8px; font-size: 12px; }
.chips { display: inline-flex; gap: 6px; flex-wrap: wrap; }
.chips button { display: inline-flex; align-items: center; gap: 6px; padding: 3px 8px 3px 10px; border-radius: 999px; background: #fdf3d7; border: 1px solid #e7c26e; color: #92400e; font-size: 12px; }
.chips button::after { content: '\00d7'; font-size: 14px; line-height: 1; opacity: .8; }
.filters .text-button { margin-left: auto; color: var(--muted); }

/* route + list panels */
.right-stack { display: flex; flex-direction: column; gap: 20px; }
.route-controls { display: grid; grid-template-columns: auto 1fr; gap: 16px; align-items: center; margin: 16px 22px 14px; }
.primary { background: var(--accent); color: #fff; border-radius: 6px; padding: 12px 16px; font-size: 13px; font-weight: 500; display: inline-flex; gap: 12px; align-items: center; }
.slider { display: grid; gap: 2px; font-size: 11px; color: var(--muted); min-width: 0; }
.slider b { color: var(--ink); font-weight: 600; }
.slider input { width: 100%; accent-color: var(--accent); margin: 0; }
.slider .ends { display: flex; justify-content: space-between; font: 9px var(--mono); letter-spacing: .5px; }
.best { margin: 0 22px 20px; border-radius: 8px; padding: 12px 14px; background: #f2f3ed; border: 1px solid #e6e8df; border-left: 3px solid var(--accent); }
.best .big { font: 600 22px 'Manrope', sans-serif; letter-spacing: -.6px; }
.best .steps { margin: 8px 0 0; padding: 0; list-style: none; font-size: 12px; color: #6f7880; }
.best .steps li { display: flex; gap: 8px; align-items: baseline; padding: 2px 0; }
.best .steps i { width: 8px; height: 8px; border-radius: 50%; background: var(--c); flex: none; position: relative; top: 1px; }
.best .none { color: var(--closed); }
#list { margin: 0 14px 16px; padding: 0; list-style: none; display: grid; gap: 5px; max-height: 520px; overflow: auto; scrollbar-width: thin; }
#list li { display: grid; grid-template-columns: 22px minmax(0, 1fr) auto; gap: 8px; align-items: center; padding: 9px 10px; border-radius: 6px; cursor: pointer; border: 1px solid #e9ebe2; background: #fafbf6; font-size: 12px; }
#list li > span { min-width: 0; }
#list li:hover { background: #f1f3ea; }
#list li[aria-current] { border-color: var(--accent); background: #fbeef0; }
#list .n { font: 10px var(--mono); color: #9ba78b; }
#list .modes { display: flex; gap: 3px; flex-wrap: wrap; }
#list .via { color: var(--muted); font-size: 11px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; display: block; }
#list .stat { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; font-weight: 600; }
#list .stat small { color: var(--muted); display: block; font-size: 10px; font-weight: 400; }
.tag { font: 600 9px var(--mono); text-transform: uppercase; letter-spacing: .5px; padding: 2px 5px; border-radius: 4px; background: var(--soft); color: var(--muted); margin-left: 4px; }
.tag.pareto { background: #dcefe0; color: #1f6b3a; }
.tag.cheapest, .tag.fastest { background: #fbe1e5; color: #9f1239; }
.tag.surveyed { background: #e0e7ff; color: #3730a3; }

/* experiment strip */
.experiment { border: 1px solid var(--line); border-radius: 10px; margin-top: 26px; padding: 24px 28px; display: grid; grid-template-columns: 1fr 1.4fr; gap: 24px 30px; align-items: center; background: #eeefe7; }
.experiment-title h2 { font: 500 20px 'Manrope', sans-serif; letter-spacing: -.7px; margin: 8px 0 7px; }
.experiment-title p { font-size: 11px; color: #7b8479; margin: 0; line-height: 1.6; }
.presets { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.presets button { text-align: left; background: var(--white); border: 1px solid #d9dccf; border-radius: 6px; padding: 10px 12px; font-size: 10px; color: #7b8479; line-height: 1.4; }
.presets button b { display: block; font-size: 12px; color: var(--ink); font-weight: 600; }
.presets button:hover { border-color: var(--accent); }
.experiment-note { grid-column: 1 / -1; display: flex; align-items: center; gap: 12px; font-size: 11px; color: #7b8479; }
.experiment-note > span { font: 22px var(--mono); color: #aab4a3; }
.experiment-note p { margin: 0; line-height: 1.6; }
.experiment-note strong { color: var(--ink); font-weight: 600; }

/* method + data */
.method { padding: 56px 0 10px; scroll-margin-top: 70px; }
.method-title h2, .data h2 { font: 500 30px 'Manrope', sans-serif; letter-spacing: -1px; margin: 10px 0 22px; }
.method-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px 40px; }
.method-grid h3 { font: 600 12px var(--mono); letter-spacing: .5px; color: var(--accent); margin: 0 0 8px; }
.method-grid p { font-size: 13px; line-height: 1.75; color: #6a737b; margin: 0; }
.method-grid strong { color: var(--ink); font-weight: 600; }
.method-grid code { font: 12px var(--mono); background: var(--soft); padding: 1px 5px; border-radius: 3px; }
.data { padding: 40px 0 10px; scroll-margin-top: 70px; }
.data-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 14px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 22px 0; }
.data-grid > div > span { display: block; font: 8px var(--mono); letter-spacing: .6px; color: #8e9599; }
.data-grid strong { display: block; font: 500 26px 'Manrope', sans-serif; letter-spacing: -1px; margin: 6px 0 2px; }
.data-grid strong small { font-size: 13px; color: var(--muted); }
.data-grid > div > small { font-size: 10px; color: #8e9599; }
.data-note { font-size: 12px; color: #6a737b; line-height: 1.7; margin: 18px 0 0; max-width: 80ch; }
footer { display: flex; justify-content: space-between; padding: 30px 0 34px; gap: 20px; color: #939b8d; font-size: 10px; flex-wrap: wrap; }
footer > div { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
footer a { color: var(--ink); font-weight: 500; }

/* standalone pages + why strip */
.why { margin-top: 26px; padding: 26px 28px; border: 1px solid var(--line); border-radius: 10px; background: var(--white); display: grid; grid-template-columns: minmax(220px, .6fr) 1.4fr; gap: 20px 40px; align-items: start; }
.why h2 { font: 500 22px 'Manrope', sans-serif; letter-spacing: -.7px; margin: 8px 0 0; }
.why p { font-size: 13px; line-height: 1.75; color: #6a737b; margin: 0; }
.why a { color: var(--accent); font-weight: 500; white-space: nowrap; }
.page-hero { padding: 52px 0 28px; max-width: 70ch; }
.page-hero h1 { margin: 12px 0 10px; }
.page-hero p { font-size: 15px; color: #6f7880; line-height: 1.7; margin: 0; }
.prose { max-width: 72ch; padding-bottom: 30px; }
.prose h2 { font: 500 22px 'Manrope', sans-serif; letter-spacing: -.7px; margin: 34px 0 10px; }
.prose p, .prose dd { font-size: 14px; line-height: 1.8; color: #5f6870; margin: 0 0 14px; }
.prose strong { color: var(--ink); font-weight: 600; }
.prose strong a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.prose code { font: 12px var(--mono); background: var(--soft); padding: 1px 5px; border-radius: 3px; }
.prose dl { margin: 0; }
.prose dt { font-weight: 600; color: var(--ink); margin-top: 14px; }
.prose dd { margin-left: 0; }
.files { list-style: none; padding: 0; margin: 0; font-size: 14px; line-height: 1.8; color: #5f6870; }
.files a { color: var(--accent); }
.prose-cta { margin-top: 30px; }
.page .data { padding-top: 0; }

/* data page: a compact evidence ledger inside the original visual system */
.data-page .page-hero { max-width: 72ch; display: block; border-bottom: 1px solid var(--line); padding-bottom: 34px; }
.data-page .page-hero h1 { margin-bottom: 8px; }
.data-page .page-hero p { max-width: 62ch; }
.data-page .data { padding: 26px 0 48px; }
.data-page .data-grid { grid-template-columns: repeat(4, 1fr); gap: 0; border: 1px solid var(--line); padding: 0; background: var(--white); }
.data-page .data-grid > div { min-height: 116px; padding: 16px 18px; border-right: 1px solid var(--line); position: relative; }
.data-page .data-grid > div:last-child { border-right: 0; }
.data-page .data-grid > div::before { content: ''; position: absolute; left: 18px; top: 0; width: 28px; height: 3px; background: var(--accent); }
.data-page .data-grid strong { margin-top: 12px; }
.data-ledger { padding-bottom: 28px; }
.data-section { display: grid; grid-template-columns: minmax(220px, .55fr) minmax(0, 1.45fr); gap: 46px; padding: 38px 0; border-top: 1px solid var(--line); }
.data-section-heading { display: grid; grid-template-columns: 28px 1fr; gap: 12px; align-content: start; }
.data-section-heading > span { width: 26px; height: 26px; border: 1px solid var(--line); border-radius: 50%; display: grid; place-items: center; font: 9px var(--mono); color: var(--accent); }
.data-section-heading h2 { font: 500 21px 'Manrope', sans-serif; letter-spacing: -.6px; margin: 0 0 8px; }
.data-section-heading p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.65; }
.data-page .sources { margin: 0; }
.data-page .sources dt { font-weight: 600; color: var(--ink); padding-top: 14px; border-top: 1px solid var(--line); }
.data-page .sources dt:first-child { padding-top: 0; border-top: 0; }
.data-page .sources dd { color: #5f6870; font-size: 13px; line-height: 1.75; margin: 5px 0 16px; }
.data-page .files { margin: 0; border-top: 1px solid var(--line); }
.data-page .files li { padding: 13px 12px; border-bottom: 1px solid var(--line); background: var(--white); }
.data-page .files li:hover { background: #f3f4ed; }
.data-page .team-copy p { margin: 0; color: #5f6870; font-size: 13px; line-height: 1.8; }
.data-page .team-copy p + p { margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--line); }
.data-page .team-section strong { color: var(--ink); }
.data-page .team-section a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.data-page .prose-cta { margin: 4px 0 32px; }
.method-page .page-hero { display: block; max-width: 72ch; }
.method-page .page-hero p { max-width: 66ch; }
.method-ledger { padding-top: 38px; }
.method-copy h3 { font: 600 14px 'Manrope', sans-serif; letter-spacing: -.2px; margin: 0 0 8px; color: var(--ink); }
.method-copy h3:not(:first-child) { margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--line); }
.method-copy p { margin: 0; color: #5f6870; font-size: 13px; line-height: 1.8; }
.method-copy p + p { margin-top: 14px; }
.method-copy strong { color: var(--ink); }
.method-copy code { font: 12px var(--mono); background: var(--soft); padding: 1px 5px; border-radius: 3px; }

/* ── schematic + map drawing ─────────────────────────────────────────────── */
#map { background: var(--map-bg); border-radius: 8px; display: block; width: 100%; height: auto; }
.geo .leaflet-tooltip.glabel { background: #fff; border: 1px solid #1f2937; border-radius: 4px; box-shadow: 0 1px 2px #0003; font: 600 10.5px/1.2 system-ui, sans-serif; color: #111827; padding: 2px 5px; white-space: nowrap; }
.geo .leaflet-tooltip.glabel.l0 { background: #e11d48; border-color: #fff; color: #fff; font-weight: 800; font-size: 12px; }
.geo .leaflet-tooltip.glabel::before { display: none; }
.geo.z1 .leaflet-tooltip.l1, .geo.z2 .leaflet-tooltip.l2 { display: none; }
.geo.has-route .gline { opacity: .35; }
.geo .gcasing { stroke: #fff; }
.geo.playing .groute { stroke-dasharray: var(--len) var(--len); stroke-dashoffset: var(--len); animation: draw var(--dur) linear var(--delay) forwards; }
.geo.playing .groute.gwalk { stroke-dasharray: 4 5; stroke-dashoffset: 0; animation: fade .2s linear var(--delay) both; }
.geo .leaflet-control-attribution { font-size: 10px; }
.geo.playing .gon { animation: gpop .3s ease var(--delay) both; }
.geo.playing .gvia { animation: gvia .35s ease var(--delay) both; }
@keyframes gpop { from { stroke-width: 2; } 50% { stroke-width: 7; } to { stroke-width: 3; } }
@keyframes gvia { from { stroke-width: 2; } 50% { stroke-width: 6; fill: #fde68a; } to { stroke-width: 2.5; fill: #fff; } }
.walklink-casing { fill: none; stroke: var(--map-bg); stroke-width: 6; pointer-events: none; }
.walklink { fill: none; stroke: #6b7280; stroke-width: 2.2; stroke-dasharray: 3 4; opacity: .72; }
.line { fill: none; stroke-width: 3.5; stroke-linecap: round; stroke-linejoin: round; transition: opacity .3s; }
.line.rail { stroke-width: 4.5; }
.line.dead { opacity: .12; }
.has-route .line { opacity: .32; }
.has-route .walklink { opacity: .35; }
.route path { fill: none; stroke-linecap: round; stroke-linejoin: round; }
.route .casing { stroke: #fff; stroke-width: 14; }
.route .ink { stroke: var(--c); stroke-width: 7; }
.route.walk .casing { stroke-width: 10; }
.route.walk .ink { stroke: #111827; stroke-width: 3; stroke-dasharray: 4 5; }
.playing .route path { stroke-dasharray: var(--len) var(--len); stroke-dashoffset: var(--len); animation: draw var(--dur) linear var(--delay) forwards; }
.playing .route.walk path { stroke-dasharray: 4 5; stroke-dashoffset: 0; animation: fade .2s linear var(--delay) both; }
.playing .route.walk .casing { stroke-dasharray: none; }
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes fade { from { opacity: 0; } to { opacity: .9; } }
.station .dot { fill: #fff; stroke: #1f2937; stroke-width: 2; cursor: pointer; transition: r .15s, stroke .15s; }
.station.xfer .dot { r: 6.5; stroke-width: 2.5; }
.station:hover .dot { r: 8.5; }
.station.on .dot { stroke: #111827; stroke-width: 3; }
.station.closed .dot { stroke: var(--closed); stroke-dasharray: 2 2; fill: #fee2e2; }
.station.must .dot { stroke: #d97706; stroke-width: 3.5; fill: #fde68a; }
.station.must text { fill: #92400e; font-weight: 700; }
.station.terminal .dot { r: 8; stroke-width: 3; fill: var(--accent); stroke: #fff; cursor: default; }
.station text { font-size: 10.5px; fill: #111827; cursor: pointer; paint-order: stroke; stroke: var(--map-bg); stroke-width: 3px; font-weight: 500; }
.station.xfer text { font-weight: 700; }
.station.closed text { fill: var(--closed); text-decoration: line-through; }
.station.terminal text { font-weight: 800; font-size: 13px; }
.playing .station.on .dot { animation: pop .3s ease var(--delay) both; }
.playing .station.via .dot { animation: viapop .35s ease var(--delay) both; }
@keyframes viapop { from { r: 5; stroke-width: 2; } 50% { r: 8; stroke-width: 3; fill: #fde68a; } to { r: 5.5; stroke-width: 2.5; fill: #fff; } }
@keyframes pop { from { r: 5; } 50% { r: 11; } to { r: 6.5; } }
.pulse { fill: none; stroke: var(--accent); stroke-width: 2; opacity: 0; }
.playing .station.on .pulse { animation: pulse 1.4s ease-out var(--delay) 1; }
@keyframes pulse { 0% { r: 8; opacity: .9; } 100% { r: 30; opacity: 0; } }

/* map view */
.geo { aspect-ratio: 870 / 600; border-radius: 8px; background: #e5e7eb; }

@media (max-width: 1080px) {
  .workspace { grid-template-columns: 1fr; }
  .top-tag { display: none; }
  .method-grid { grid-template-columns: 1fr; }
  .data-grid { grid-template-columns: repeat(3, 1fr); }
  .experiment { grid-template-columns: 1fr; }
  .why { grid-template-columns: 1fr; }
  .data-page .data-grid { grid-template-columns: repeat(2, 1fr); }
  .data-page .data-grid > div:nth-child(2) { border-right: 0; }
  .data-page .data-grid > div:nth-child(-n + 2) { border-bottom: 1px solid var(--line); }
}
@media (max-width: 720px) {
  main { padding: 0 16px; }
  .topbar { height: auto; min-height: 54px; padding: 10px 16px; gap: 8px 12px; flex-wrap: wrap; }
  .brand { font-size: 21px; }
  nav { width: 100%; margin-left: 0; gap: 14px; justify-content: space-between; }
  nav a { font-size: 12px; }
  .lang { margin-left: auto; }
  .lang button { padding: 4px 8px; }
  .intro { padding: 32px 0 26px; }
  h1 { font-size: 34px; letter-spacing: -1.6px; }
  .specimen { display: none; }
  .hero-stats { width: 100%; justify-content: space-between; }
  .hero-stats li { max-width: none; flex: 1; }
  .panel-heading { padding: 16px 16px 0; }
  .panel-description, .legend, .route-controls, .best { margin-left: 16px; margin-right: 16px; }
  .filters { padding-left: 16px; padding-right: 16px; }
  .map { margin: 0 8px; }
  .route-controls { grid-template-columns: 1fr; }
  .presets { grid-template-columns: 1fr; }
  .data-grid { grid-template-columns: repeat(2, 1fr); }
  .data-page .data-grid { grid-template-columns: repeat(2, 1fr); }
  .data-page .data-grid > div { border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
  .data-page .data-grid > div:nth-child(2n) { border-right: 0; }
  .data-page .data-grid > div:nth-last-child(-n + 2) { border-bottom: 0; }
  .data-section { grid-template-columns: 1fr; gap: 22px; padding: 30px 0; }
  .station text { font-size: 12px; }
  footer { flex-direction: column; align-items: center; text-align: center; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .playing .route path, .geo.playing .groute { stroke-dasharray: none; stroke-dashoffset: 0; }
}