:root {
  color-scheme: light;
  --surface-0: #f4f3f0;
  --surface-1: #fcfcfb;
  --surface-2: #ffffff;
  --border: #dddcd7;
  --text-primary: #0b0b0b;
  --text-secondary: #52514e;
  --text-muted: #7a7974;
  --accent: #256abf;
  --accent-ink: #ffffff;
  --danger: #b42318;
  --ok: #1f7a4d;
  --hero-a: #1f4fa8;
  --hero-b: #e8344e;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --surface-0: #121211;
    --surface-1: #1a1a19;
    --surface-2: #121211;
    --border: #34332f;
    --text-primary: #ffffff;
    --text-secondary: #c3c2b7;
    --text-muted: #8e8d85;
    --accent: #6da7ec;
    --accent-ink: #0b0b0b;
    --danger: #f97066;
    --ok: #47cd89;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --surface-0: #121211;
  --surface-1: #1a1a19;
  --surface-2: #121211;
  --border: #34332f;
  --text-primary: #ffffff;
  --text-secondary: #c3c2b7;
  --text-muted: #8e8d85;
  --accent: #6da7ec;
  --accent-ink: #0b0b0b;
  --danger: #f97066;
  --ok: #47cd89;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--surface-0); color: var(--text-primary);
  font: 15px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--accent); }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
header.top { border-bottom: 1px solid var(--border); background: var(--surface-1); }
header.top .wrap { display: flex; align-items: center; justify-content: space-between; height: 56px; }
.brand { font-weight: 700; letter-spacing: -0.01em; color: var(--text-primary); text-decoration: none; display: flex; gap: 8px; align-items: center; }
.brand .dot { width: 14px; height: 14px; border-radius: 50%; background: linear-gradient(135deg, var(--hero-b), #f9b26b 45%, #5bbdb0 70%, var(--hero-a)); }
nav a { color: var(--text-secondary); text-decoration: none; margin-left: 18px; font-size: 14px; }
nav a:hover { color: var(--text-primary); }
h1 { font-size: clamp(28px, 4.6vw, 44px); line-height: 1.12; letter-spacing: -0.02em; margin: 0 0 14px; }
h2 { font-size: 22px; margin: 0 0 12px; letter-spacing: -0.01em; }
h3 { font-size: 16px; margin: 0 0 6px; }
.lead { font-size: 17px; color: var(--text-secondary); max-width: 560px; }
.hero { display: grid; grid-template-columns: 1.05fr 1fr; gap: 32px; align-items: center; padding: 48px 0 24px; }
.examples { margin: 0; width: 100%; }
.examples img { width: 100%; height: auto; aspect-ratio: 1400 / 900; object-fit: contain; border-radius: 10px; border: 1px solid var(--border); display: block; background: #eef0f3; }
.examples figcaption { font-size: 12.5px; color: var(--text-muted); margin-top: 6px; }
.section { padding: 32px 0; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card { background: var(--surface-1); border: 1px solid var(--border); border-radius: 10px; padding: 18px; }
.card p { margin: 0; color: var(--text-secondary); font-size: 14px; }
.num { display: inline-flex; width: 26px; height: 26px; border-radius: 50%; align-items: center; justify-content: center; background: var(--accent); color: var(--accent-ink); font-weight: 700; font-size: 13px; margin-bottom: 8px; }
.order { display: grid; grid-template-columns: 1.3fr 1fr; gap: 24px; align-items: start; }
label.f { display: block; font-size: 13px; font-weight: 600; color: var(--text-secondary); margin: 14px 0 6px; }
textarea, input[type=text], select {
  width: 100%; font: inherit; font-size: 14px; color: var(--text-primary); background: var(--surface-2);
  border: 1px solid var(--border); border-radius: 8px; padding: 9px 10px;
}
textarea { font-family: ui-monospace, Consolas, monospace; font-size: 12.5px; min-height: 118px; resize: vertical; }
textarea:focus, input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.hint { font-size: 12.5px; color: var(--text-muted); margin-top: 6px; }
.check { display: flex; gap: 8px; align-items: flex-start; font-size: 13.5px; color: var(--text-secondary); margin-top: 14px; }
.check input { margin-top: 4px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; font: inherit; font-weight: 600; font-size: 15px;
  padding: 11px 18px; border-radius: 8px; border: 1px solid var(--accent); background: var(--accent); color: var(--accent-ink);
  cursor: pointer; text-decoration: none;
}
.btn.secondary { background: var(--surface-1); color: var(--text-primary); border-color: var(--border); }
.btn[disabled] { opacity: .6; cursor: progress; }
.btn.block { width: 100%; margin-top: 16px; }
.err { color: var(--danger); font-size: 13.5px; margin-top: 10px; min-height: 1em; }
.price { font-size: 34px; font-weight: 700; letter-spacing: -0.02em; }
.list { margin: 10px 0 0; padding-left: 18px; color: var(--text-secondary); font-size: 14px; }
.list li { margin: 4px 0; }
.notice { font-size: 13px; color: var(--text-secondary); background: var(--surface-1); border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px; }
footer.bottom { border-top: 1px solid var(--border); margin-top: 32px; padding: 20px 0 32px; font-size: 13px; color: var(--text-muted); }
footer.bottom a { color: var(--text-secondary); margin-right: 14px; }
.doc { max-width: 720px; padding: 32px 0; }
.doc h2 { margin-top: 28px; font-size: 18px; }
.doc p, .doc li { color: var(--text-secondary); }
.draft { border: 1px dashed var(--danger); color: var(--danger); padding: 8px 12px; border-radius: 8px; font-size: 13px; }

/* map page */
.app { display: grid; grid-template-columns: 300px 1fr; gap: 0; min-height: calc(100vh - 57px); }
.app aside { background: var(--surface-1); border-right: 1px solid var(--border); padding: 16px; display: flex; flex-direction: column; gap: 12px; }
.app main { padding: 16px; display: flex; flex-direction: column; gap: 16px; min-width: 0; }
.mapbox { position: relative; background: #e9ecef; border-radius: 10px; overflow: hidden; border: 1px solid var(--border); aspect-ratio: 1400 / 900; }
.mapbox img { width: 100%; height: 100%; display: block; object-fit: contain; transition: opacity .2s; }
.mapbox.loading img { opacity: .55; }
.mapbox .spin { position: absolute; right: 12px; top: 12px; font-size: 12.5px; background: rgba(255,255,255,.9); color: #333; padding: 4px 10px; border-radius: 6px; display: none; }
.mapbox.loading .spin { display: block; }
.lbl { font-size: 12px; font-weight: 600; color: var(--text-secondary); display: block; margin-bottom: 4px; }
.val { float: right; font-weight: 400; color: var(--text-primary); font-variant-numeric: tabular-nums; }
.seg { display: flex; border: 1px solid var(--border); border-radius: 6px; overflow: hidden; }
.seg button { flex: 1; font: inherit; font-size: 12.5px; padding: 6px 4px; border: 0; cursor: pointer; background: var(--surface-0); color: var(--text-secondary); }
.seg button + button { border-left: 1px solid var(--border); }
.seg button[aria-pressed=true] { background: var(--accent); color: var(--accent-ink); font-weight: 600; }
.checks { display: flex; flex-direction: column; gap: 5px; font-size: 13px; color: var(--text-secondary); }
.checks label { display: flex; gap: 6px; align-items: center; cursor: pointer; }
input[type=range] { width: 100%; }
.cols { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
table { width: 100%; border-collapse: collapse; font-size: 13px; font-variant-numeric: tabular-nums; }
th { text-align: left; font-weight: 600; color: var(--text-muted); font-size: 12px; padding: 5px 6px; border-bottom: 1px solid var(--border); }
td { padding: 4px 6px; border-bottom: 1px solid var(--border); }
td.r, th.r { text-align: right; }
.muted { color: var(--text-muted); }
.linkrow { display: flex; gap: 8px; }
.linkrow input { font-family: ui-monospace, Consolas, monospace; font-size: 12px; }
.small { font-size: 12.5px; color: var(--text-secondary); }
.srchead { margin: 12px 0 4px; font-size: 11.5px; font-weight: 600; letter-spacing: .04em; text-transform: uppercase; color: var(--text-muted); }
.infinfo { margin-top: 10px; font-size: 12.5px; }
.infinfo summary { cursor: pointer; color: var(--accent); font-weight: 600; }
.infinfo p { margin: 8px 0; }
.srcnote { display: block; margin-top: 4px; padding-left: 8px; border-left: 2px solid var(--accent); font-size: 12.5px; color: var(--text-secondary); }

@media (max-width: 860px) {
  .hero, .order, .steps, .cols { grid-template-columns: 1fr; }
  .app { grid-template-columns: 1fr; }
  .app aside { border-right: 0; border-bottom: 1px solid var(--border); }
  nav a { margin-left: 12px; }
}
.mt { margin-top: 16px; } .mt8 { margin-top: 8px; }
.badge { display: inline-block; font-size: 11px; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; vertical-align: middle; padding: 2px 7px; border-radius: 999px; background: var(--accent); color: var(--accent-ink); }
.option { display: flex; gap: 10px; align-items: flex-start; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; margin-top: 10px; cursor: pointer; background: var(--surface-2); }
.option:has(input:checked) { border-color: var(--accent); outline: 1px solid var(--accent); }
.option input { margin-top: 5px; }
.filepick { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; cursor: pointer; }
.filepick input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.filepick:focus-within .btn { outline: 2px solid var(--accent); outline-offset: 2px; }
.btns { display: flex; gap: 8px; flex-wrap: wrap; }
.nog25 { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; }
[hidden] { display: none !important; }
.mapbox { touch-action: none; cursor: grab; user-select: none; }
.mapbox.dragging { cursor: grabbing; }
.mapbox img { transform-origin: 0 0; will-change: transform; pointer-events: none; }
.zoombar { position: absolute; right: 12px; bottom: 12px; display: flex; flex-direction: column; border-radius: 8px; overflow: hidden; box-shadow: 0 1px 4px rgba(0,0,0,.25); }
.zoombar button { width: 34px; height: 34px; font: inherit; font-size: 18px; line-height: 1; border: 0; background: rgba(255,255,255,.94); color: #1b1f2a; cursor: pointer; }
.zoombar button + button { border-top: 1px solid #dddcd7; }
.zoombar button:hover { background: #ffffff; }
.zoombar button:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.hint-map { margin: -8px 0 0; color: var(--text-muted); }
.notice.keep { border-left: 3px solid var(--accent); }
.coverage { max-width: 560px; margin: -4px 0 18px; }

/* rotating landing-page examples */
.examples .ex-stage { position: relative; aspect-ratio: 1400 / 900; border-radius: 10px; overflow: hidden; border: 1px solid var(--border); background: #eef0f3; }
.examples .ex-img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; opacity: 0; transition: opacity .7s ease; border: 0; border-radius: 0; }
.examples .ex-img.on { opacity: 1; }
.examples figcaption { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 12px; }
.examples #exCap { color: var(--text-secondary); font-weight: 600; }
.ex-dots { display: inline-flex; gap: 6px; margin-left: auto; }
.ex-dots button { width: 9px; height: 9px; padding: 0; border-radius: 50%; border: 0; background: var(--border); cursor: pointer; }
.ex-dots button[aria-current="true"] { background: var(--accent); }
.ex-dots button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.ex-note { flex-basis: 100%; }
@media (prefers-reduced-motion: reduce) { .examples .ex-img { transition: none; } }

.infalt { margin: 0 0 10px; padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px; }
.infalt label { font-weight: 600; display: flex; gap: 8px; align-items: center; }
.infalt p { margin: 6px 0 0; }
.howcalc { margin-top: 10px; font-size: 13px; color: var(--text-secondary); }
.howcalc summary { cursor: pointer; color: var(--accent); font-weight: 600; }
.howcalc p { margin: 8px 0 0; }
.btn.busy { opacity: .7; pointer-events: none; }

/* "Ancestry through time" example clip on the landing page */
.anim-ex { margin: 16px 0 0; }
.anim-ex video { display: block; width: 100%; height: auto; aspect-ratio: 800 / 516; border-radius: 8px; border: 1px solid var(--border); background: #1e4ba6; }
.anim-ex figcaption { margin-top: 6px; color: var(--text-secondary); }

/* very narrow screens (small phones, side panes): less padding so text keeps its width */
@media (max-width: 420px) {
  .wrap { padding-left: 10px; padding-right: 10px; }
  .card { padding: 14px 12px; }
  .option { gap: 8px; padding: 9px 9px; }
}

/* "Explore a population" (population maps) */
.explore { max-width: 720px; }
.popds { display: flex; gap: 10px; }
.popds .option { flex: 1; margin-top: 6px; }

/* top of the landing page: two equal entry points */
.doors { grid-template-columns: 1fr 1fr; align-items: stretch; }
.door { display: flex; flex-direction: column; padding: 26px; }
.door .lead { flex: 1; }
.door .btn { align-self: flex-start; margin-top: 8px; }
.door .door-title { font-size: clamp(26px, 3.2vw, 36px); line-height: 1.12; letter-spacing: -0.02em; margin: 0 0 14px; }
@media (max-width: 860px) {
  .doors { grid-template-columns: 1fr; }
  .door { padding: 20px; }
}
@media (max-width: 520px) {     /* keep the header on one line: these two are also in the footer and the page */
  .top nav a[href="#how"], .top nav a[href="/privacy"] { display: none; }
}
.door-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 8px; }
.door-actions .btn { margin-top: 0; }

/* "Save as image" links on result cards (download the shareable results card) */
.card-head { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; }
.imgdl { font-size: 13px; font-weight: 600; color: var(--accent); text-decoration: none; white-space: nowrap; }
.imgdl:hover { text-decoration: underline; }

/* results card shown under the heatmap */
.resultcard { max-width: 580px; margin: 14px auto 0; }      /* centred under the map; header, image and caption share one width */
.resultcard img { display: block; width: 100%; height: auto; aspect-ratio: 1080 / 1350; margin: 10px 0 6px;
  border-radius: 14px; background: #141a33; box-shadow: 0 6px 24px rgba(0, 0, 0, .25); }
.resultcard figcaption { text-align: center; }

/* results row: guide | results card | share & explore */
.resultrow { display: grid; grid-template-columns: minmax(228px, 0.5fr) minmax(0, 720px) minmax(228px, 0.5fr); gap: 16px; align-items: start; margin-top: 14px; }
.resultrow .resultcard { max-width: none; margin: 0; }
.side h3.mt { margin-top: 16px; }
.scale { position: relative; display: flex; height: 12px; margin: 10px 0 4px; }
.scale span { display: block; height: 100%; }
.s1 { background: #e8344e; } .s2 { background: #f9b26b; } .s3 { background: #9fdba6; } .s4 { background: #2a63b8; }
.scale .s1 { width: 13.33%; border-radius: 6px 0 0 6px; } .scale .s2 { width: 20%; } .scale .s3 { width: 33.33%; }
.scale .s4 { width: 33.34%; border-radius: 0 6px 6px 0; }
.scale .mark { position: absolute; top: -5px; width: 4px; height: 22px; background: var(--text); border-radius: 2px; transform: translateX(-2px); box-shadow: 0 0 0 2px var(--surface-1); }
.scale-lbl { position: relative; height: 16px; font-size: 11px; color: var(--text-muted); margin-bottom: 8px; }
.scale-lbl span { position: absolute; transform: translateX(-50%); }
.scale-lbl .l0 { left: 0; transform: none; } .scale-lbl .l1 { left: 13.33%; } .scale-lbl .l2 { left: 33.33%; }
.scale-lbl .l3 { left: 66.67%; } .scale-lbl .l4 { left: 100%; transform: translateX(-100%); }
.keylist { list-style: none; padding: 0; margin: 0 0 8px; }
.keylist li { display: flex; align-items: center; gap: 8px; margin: 3px 0; }
.keylist i { display: inline-block; width: 12px; height: 12px; border-radius: 3px; flex: none; }
.guide-notes p { margin: 6px 0; }
.sharebtns { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0; }
.btn.sm { padding: 6px 12px; font-size: 13px; }
.qr { display: flex; gap: 12px; align-items: center; margin-top: 10px; }
.qr img { border-radius: 6px; background: #fff; }
.explink { font-weight: 600; }
.idlink { text-decoration: underline dotted; }
.ids { margin-top: 2px; word-break: break-word; }
@media (max-width: 1400px) {
  .resultrow { grid-template-columns: 1fr 1fr; }
  .resultrow .resultcard { grid-column: 1 / -1; order: -1; max-width: 720px; width: 100%; margin: 0 auto; }
}
@media (max-width: 640px) { .resultrow { grid-template-columns: 1fr; } }

/* raw DNA kits chosen for the simulator, one chip per chip */
.kit { display: inline-flex; align-items: center; gap: 6px; padding: 2px 6px; margin: 2px 4px 2px 0;
  border: 1px solid var(--border); border-radius: 999px; }
.kitx { background: none; border: 0; color: var(--text-secondary); cursor: pointer; font-size: 15px; line-height: 1; padding: 0 2px; }
.kitx:hover { color: var(--text); }