/* Property Price Estimator. One accent (blue), light and dark from the system setting. */
:root {
  color-scheme: light;
  --page: #f9f9f7;
  --surface: #fcfcfb;
  --ink: #0b0b0b;
  --ink-2: #52514e;
  --muted: #6f6d67;
  --grid: #e1e0d9;
  --axis: #c3c2b7;
  --border: rgba(11, 11, 11, 0.12);
  --control: #858379;          /* borders of inputs and buttons: 3:1 against the surface */
  --accent: #2a78d6;          /* categorical slot 1 */
  --accent-strong: #1c5cab;   /* links, selected text */
  --accent-wash: #cde2fb;
  --down: #e34948;            /* diverging partner of the accent */
  --good: #006300;
  --good-wash: #e3f1e3;
  --warn: #7a5200;
  --warn-wash: #fdf0d2;
  --bad: #a42b2b;
  --bad-wash: #fbe5e5;
  --focus: #1c5cab;
  --type-house: #2a78d6;
  --type-condo: #eb6834;
  --type-lot: #1baf7a;
  --type-commercial: #898781;   /* neutral: a fourth hue fails the all-pairs check */
  --model-rf: #2a78d6;
  --model-xgb: #eb6834;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --page: #0d0d0d;
    --surface: #1a1a19;
    --ink: #ffffff;
    --ink-2: #c3c2b7;
    --muted: #a09e96;
    --grid: #2c2c2a;
    --axis: #383835;
    --border: rgba(255, 255, 255, 0.12);
    --control: #85847c;
    --accent: #3987e5;
    --accent-strong: #86b6ef;
    --accent-wash: #184f95;
    --down: #e66767;
    --good: #5fd35f;
    --good-wash: #16301a;
    --warn: #f3c25a;
    --warn-wash: #3a2d0c;
    --bad: #f08a8a;
    --bad-wash: #3b1a1a;
    --focus: #86b6ef;
    --type-house: #3987e5;
    --type-condo: #d95926;
    --type-lot: #199e70;
    --type-commercial: #a09e96;
    --model-rf: #3987e5;
    --model-xgb: #d95926;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font: 16px/1.5 var(--font);
}
h1, h2, h3, p { margin: 0; }
button, input, select { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

.wrap { max-width: 1200px; margin: 0 auto; padding: 0 16px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--surface); padding: 8px 12px; z-index: 10; }
.skip:focus { left: 8px; }

/* Header and tabs */
.top { background: var(--surface); border-bottom: 1px solid var(--border); padding-top: 16px; }
.top h1 { font-size: 1.375rem; font-weight: 650; letter-spacing: -0.01em; }
.sub { color: var(--ink-2); font-size: 0.9375rem; margin: 2px 0 12px; }
.tabs { display: flex; gap: 4px; overflow-x: auto; }
.tabs button {
  background: none; border: 0; border-bottom: 3px solid transparent;
  padding: 10px 14px; cursor: pointer; color: var(--ink-2); white-space: nowrap; font-weight: 500;
}
.tabs button:hover { color: var(--ink); }
.tabs button[aria-selected="true"] { color: var(--ink); border-bottom-color: var(--accent); }

/* Loading */
.loading { display: flex; flex-direction: column; align-items: center; gap: 12px; padding: 96px 16px; color: var(--ink-2); text-align: center; }
.loading[hidden] { display: none; }
.loading.failed .spinner { display: none; }
.loading.failed p { color: var(--bad); max-width: 46ch; }
.spinner { width: 28px; height: 28px; border-radius: 50%; border: 3px solid var(--grid); border-top-color: var(--accent); animation: spin 0.9s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .spinner { animation-duration: 3s; } }

/* Layout */
main { padding-top: 20px; padding-bottom: 48px; }
.layout { display: grid; grid-template-columns: minmax(0, 380px) minmax(0, 1fr); gap: 20px; align-items: start; }
.results { display: grid; gap: 16px; min-width: 0; }
@media (max-width: 900px) { .layout { grid-template-columns: minmax(0, 1fr); } }

.panel, .card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 16px; }
.panel { position: sticky; top: 12px; }
@media (max-width: 900px) { .panel { position: static; } }
.panel h2 { font-size: 1.0625rem; margin-bottom: 12px; }

/* Form */
fieldset { border: 0; padding: 0; margin: 16px 0 0; min-width: 0; }
legend { font-size: 0.8125rem; font-weight: 600; color: var(--ink-2); text-transform: uppercase; letter-spacing: 0.04em; padding: 0; margin-bottom: 8px; }
.field { margin-bottom: 12px; min-width: 0; }
label { display: block; font-size: 0.9375rem; font-weight: 500; margin-bottom: 4px; }
input[type="text"], input[type="number"], select {
  width: 100%; min-height: 44px; padding: 8px 10px; background: var(--page);
  border: 1px solid var(--control); border-radius: 8px;
}
input[aria-invalid="true"] { border-color: var(--bad); box-shadow: 0 0 0 1px var(--bad); }
select:disabled { opacity: 0.6; }
.check { display: flex; align-items: center; gap: 8px; font-weight: 400; margin: 8px 0 0; min-height: 32px; }
.check input { width: 18px; height: 18px; accent-color: var(--accent); }
.hint { color: var(--ink-2); font-size: 0.8125rem; margin-top: 4px; }
.msg { color: var(--bad); font-size: 0.8125rem; margin-top: 4px; min-height: 0; }
.msg:empty { display: none; }

.presets { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.presets-label { font-size: 0.8125rem; color: var(--ink-2); width: 100%; }
.chip {
  min-height: 40px; padding: 6px 14px; border-radius: 999px; background: var(--page);
  border: 1px solid var(--control); cursor: pointer; font-size: 0.875rem;
}
.chip:hover { border-color: var(--accent); }

.seg { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border: 1px solid var(--control); border-radius: 8px; overflow: hidden; }
.seg label { margin: 0; position: relative; }
.seg input { position: absolute; opacity: 0; inset: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; }
.seg span { display: block; text-align: center; padding: 10px 2px; font-size: 0.875rem; background: var(--page); border-left: 1px solid var(--control); min-height: 44px; }
.seg label:first-child span { border-left: 0; }
.seg input:checked + span { background: var(--accent-wash); font-weight: 650; box-shadow: inset 0 -3px 0 var(--accent); }
.seg input:focus-visible + span { outline: 3px solid var(--focus); outline-offset: -3px; }

.pair { display: grid; grid-template-columns: minmax(0, 1fr) 112px; gap: 12px; align-items: center; }
input[type="range"] { width: 100%; accent-color: var(--accent); min-height: 32px; }
.steppers { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.stepper { display: grid; grid-template-columns: 40px minmax(0, 1fr) 40px; }
.stepper button { min-height: 44px; border: 1px solid var(--control); background: var(--page); cursor: pointer; font-size: 1.125rem; }
.stepper button:first-child { border-radius: 8px 0 0 8px; }
.stepper button:last-child { border-radius: 0 8px 8px 0; }
.stepper button:disabled { opacity: 0.4; cursor: default; }
.stepper input { border-radius: 0; text-align: center; border-left: 0; border-right: 0; padding: 8px 2px; }
.adv { margin-top: 16px; }
.adv summary { cursor: pointer; color: var(--accent-strong); font-size: 0.9375rem; padding: 12px 0; }
.actions { margin-top: 12px; }
.ghost { background: none; border: 1px solid var(--control); border-radius: 8px; padding: 8px 14px; cursor: pointer; min-height: 40px; }
.ghost:hover { border-color: var(--accent); }

/* Results */
.hero { padding: 20px; }
.eyebrow { font-size: 0.875rem; color: var(--ink-2); }
.price { font-size: clamp(2.25rem, 7vw, 3.5rem); font-weight: 650; letter-spacing: -0.02em; line-height: 1.1; margin: 2px 0 6px; overflow-wrap: anywhere; }
.price.stale { color: var(--muted); }
.range { font-size: 1.0625rem; font-weight: 550; }
.note { color: var(--ink-2); font-size: 0.875rem; margin-top: 4px; }
.disclaimer { margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--border); }
.badge { display: flex; gap: 10px; align-items: flex-start; margin-top: 14px; padding: 10px 12px; border-radius: 8px; font-size: 0.9375rem; }
.badge[hidden] { display: none; }
.badge svg { flex: none; width: 20px; height: 20px; margin-top: 2px; }
.badge strong { display: block; }
.badge.good { background: var(--good-wash); color: var(--good); }
.badge.warn { background: var(--warn-wash); color: var(--warn); }
.badge.bad { background: var(--bad-wash); color: var(--bad); }
.badge span { color: var(--ink); }

.chart h3 { font-size: 1rem; }
.chart-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 8px; }
.summary { color: var(--ink-2); font-size: 0.875rem; margin: 4px 0 8px; }
.toggle { display: inline-flex; border: 1px solid var(--control); border-radius: 8px; overflow: hidden; }
.toggle button { background: var(--page); border: 0; padding: 6px 12px; cursor: pointer; font-size: 0.875rem; min-height: 40px; }
.toggle button + button { border-left: 1px solid var(--control); }
.toggle button[aria-pressed="true"] { background: var(--accent-wash); font-weight: 650; }
.plot { width: 100%; height: 320px; }
.plot.mid { height: 240px; }
.plot.short { height: 230px; }
@media (max-width: 520px) { .plot { height: 280px; } .plot.mid { height: 230px; } .plot.short { height: 220px; } }
.key { color: var(--ink-2); font-size: 0.8125rem; margin: 0 0 4px; display: flex; flex-wrap: wrap; gap: 4px 14px; align-items: center; }
.dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 6px; }
.results.stale .chart { opacity: 0.45; }
.dot.up { background: var(--accent); }
.dot.down { background: var(--down); }
.noscript { padding-top: 24px; }

@media (forced-colors: active) {
  .seg input:checked + span, .toggle button[aria-pressed="true"] { outline: 2px solid Highlight; }
}

/* Explore and About */
.stack { display: grid; gap: 16px; min-width: 0; }
.lede { color: var(--ink-2); max-width: 70ch; }
.plot.tall { height: 460px; }
.plot.mini { height: 230px; }
@media (max-width: 520px) { .plot.tall { height: 360px; } }
.trio { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
@media (max-width: 800px) { .trio { grid-template-columns: minmax(0, 1fr); } }
.trio h4 { font-size: 0.9375rem; margin: 0 0 2px; }
.dir { display: block; font-weight: 400; font-size: 0.75rem; color: var(--ink-2); }
.table-wrap { overflow-x: auto; }
table.metrics { width: 100%; border-collapse: collapse; font-size: 0.9375rem; }
table.metrics th, table.metrics td { padding: 10px 12px; border-bottom: 1px solid var(--border); text-align: right; font-variant-numeric: tabular-nums; }
table.metrics thead th { font-size: 0.8125rem; color: var(--ink-2); font-weight: 600; }
table.metrics th[scope="row"], table.metrics thead th:first-child { text-align: left; font-weight: 500; }
.chart .badge { margin: 0 0 8px; }
.prose { max-width: 78ch; }
.prose h2 { font-size: 1.25rem; margin-bottom: 8px; }
.prose h3 { font-size: 1rem; margin: 20px 0 6px; }
.prose p, .prose li { color: var(--ink); }
.prose ul, .prose ol { padding-left: 1.25rem; margin: 6px 0 0; }
.prose li { margin-bottom: 8px; }

/* Screen-reader-only text, and the compact price bar shown on phones when the result is off screen */
.sr-only { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.pricebar {
  position: fixed; left: 12px; right: 12px; bottom: 12px; z-index: 20; display: none; align-items: center; justify-content: space-between; gap: 12px;
  min-height: 52px; padding: 8px 16px; border-radius: 12px; cursor: pointer; text-align: left;
  background: var(--surface); color: var(--ink); border: 1px solid var(--control); box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
}
.pricebar:not([hidden]) { display: flex; }
.pricebar strong { font-size: 1.125rem; }
.pb-go { color: var(--accent-strong); font-size: 0.875rem; white-space: nowrap; }
@media (min-width: 901px) { .pricebar, .pricebar:not([hidden]) { display: none; } }
@media (max-width: 520px) {
  .tabs { gap: 0; }
  .tabs button { padding: 10px 9px; font-size: 0.9375rem; }
  main { padding-bottom: 88px; }
}

/* My data */
.d-actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-top: 12px; }
.filebtn { display: inline-flex; align-items: center; min-height: 40px; padding: 8px 16px; margin: 0; border-radius: 8px; background: var(--accent-strong); color: #fff; font-weight: 600; cursor: pointer; }
#d-file:focus-visible + .filebtn { outline: 3px solid var(--focus); outline-offset: 2px; }
#d-file:disabled + .filebtn { opacity: 0.5; cursor: not-allowed; }
.linkbtn { color: var(--accent-strong); font-size: 0.9375rem; min-height: 40px; display: inline-flex; align-items: center; }
#d-drop.over { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent); }
.msg-line { margin-top: 12px; padding: 10px 12px; border-radius: 8px; background: var(--page); border: 1px solid var(--border); font-size: 0.9375rem; }
.msg-line.good { background: var(--good-wash); color: var(--good); border-color: transparent; }
.msg-line.warn { background: var(--warn-wash); color: var(--warn); border-color: transparent; }
.msg-line.bad { background: var(--bad-wash); color: var(--bad); border-color: transparent; }
.msg-line[hidden] { display: none; }
.kpis { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
@media (max-width: 800px) { .kpis { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.kpi { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; display: grid; gap: 2px; min-width: 0; }
.kpi span { color: var(--ink-2); font-size: 0.8125rem; }
.kpi strong { font-size: 1.375rem; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.insights { margin: 10px 0 0; padding-left: 20px; display: grid; gap: 10px; max-width: 80ch; }
.sub-h { font-size: 0.9375rem; margin: 14px 0 4px; }
#tab-data code { background: var(--page); border: 1px solid var(--border); border-radius: 4px; padding: 0 4px; font-size: 0.875em; }
.ghost.danger { border-color: var(--bad); color: var(--bad); }
#d-preview th[scope="row"], #d-low th[scope="row"], #d-high th[scope="row"], #d-imports th[scope="row"] { text-align: left; font-weight: 500; }
#d-imports th[scope="row"] { overflow-wrap: anywhere; }
#tab-data .stack { grid-template-columns: minmax(0, 1fr); }