/* Expected vs Observed: shared styles for the project page and the atlas.
   One typeface (Geist, self-hosted, OFL), one accent (the data blue),
   light and dark themes from the same tokens. Corner radius system: 8px on
   controls and panels, 0 on charts and maps. */

@font-face {
  font-family: "Geist";
  src: url("../fonts/Geist-Variable.woff2") format("woff2");
  font-weight: 100 900;
  font-display: swap;
}
@font-face {
  font-family: "Geist Mono";
  src: url("../fonts/GeistMono-Variable.woff2") format("woff2");
  font-weight: 100 900;
  font-display: swap;
}

:root {
  color-scheme: light;
  --page: #f9f9f7;
  --surface: #fcfcfb;
  --surface-2: #f2f1ed;
  --ink: #0b0b0b;
  --ink-2: #52514e;
  --muted: #6f6d68;
  --grid: #e1e0d9;
  --axis: #c3c2b7;
  --ring: rgba(11, 11, 11, 0.10);
  --accent: #2a78d6;
  --accent-ink: #1c5cab;
  --missing: #dcdbd5;
  --missing-hatch: #c3c2b7;
  --state-line: #ffffff;
  --county-line: rgba(255, 255, 255, 0.55);
  --mid: #f0efec;
  --focus: #1c5cab;
  --radius: 8px;
  --font: "Geist", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --page: #0f0f0e;
    --surface: #1a1a19;
    --surface-2: #232321;
    --ink: #f0efec;
    --ink-2: #c3c2b7;
    --muted: #9b9991;
    --grid: #2c2c2a;
    --axis: #45453f;
    --ring: rgba(255, 255, 255, 0.10);
    --accent: #5598e7;
    --accent-ink: #86b6ef;
    --missing: #2e2e2b;
    --missing-hatch: #45453f;
    --state-line: #0f0f0e;
    --county-line: rgba(15, 15, 14, 0.5);
    --mid: #383835;
    --focus: #86b6ef;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.55;
  font-feature-settings: "ss01";
}
img, svg { max-width: 100%; }
a { color: var(--accent-ink); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
h1, h2, h3 { text-wrap: balance; letter-spacing: -0.02em; line-height: 1.12; margin: 0; }
p { text-wrap: pretty; margin: 0; }
.num, td.num, .tabular { font-variant-numeric: tabular-nums; }
.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

/* top bar */
.topbar {
  height: 60px; display: flex; align-items: center; gap: 24px;
  padding: 0 clamp(16px, 4vw, 40px); border-bottom: 1px solid var(--ring);
  background: var(--page); position: sticky; top: 0; z-index: 20;
}
.topbar .brand { font-weight: 650; letter-spacing: -0.01em; color: var(--ink); text-decoration: none; white-space: nowrap; }
.topbar nav { display: flex; gap: 20px; margin-left: auto; }
.topbar nav a { color: var(--ink-2); text-decoration: none; font-size: 14px; white-space: nowrap; }
.topbar nav a[aria-current="page"], .topbar nav a:hover { color: var(--ink); }

/* buttons and controls */
.btn {
  display: inline-flex; align-items: center; gap: 8px; height: 44px; padding: 0 18px;
  border-radius: var(--radius); border: 1px solid transparent; font: inherit; font-weight: 550;
  text-decoration: none; cursor: pointer; white-space: nowrap; transition: transform 0.15s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent-ink); color: #ffffff; }
/* Button colour fixed in both themes (white on #1c5cab = 6.6:1); not the accent
   token, which is lighter in dark mode. */
.btn-primary { background: #1c5cab; color: #ffffff; }
.btn-secondary { background: transparent; color: var(--ink); border-color: var(--axis); }

.segmented { display: inline-grid; grid-auto-flow: column; border: 1px solid var(--axis); border-radius: var(--radius); overflow: hidden; }
.segmented button {
  font: inherit; font-size: 14px; padding: 7px 12px; border: 0; background: transparent; color: var(--ink-2); cursor: pointer;
}
.segmented button + button { border-left: 1px solid var(--axis); }
.segmented button[aria-pressed="true"] { background: var(--ink); color: var(--page); }

select, input[type="search"] {
  font: inherit; font-size: 15px; color: var(--ink); background: var(--surface);
  border: 1px solid var(--axis); border-radius: var(--radius); height: 40px; padding: 0 10px; width: 100%;
}
label.field { display: grid; gap: 6px; font-size: 13px; color: var(--ink-2); font-weight: 550; }
.check { display: flex; gap: 8px; align-items: center; font-size: 14px; color: var(--ink-2); }

/* tooltip */
.tooltip {
  position: fixed; pointer-events: none; z-index: 40; min-width: 220px; max-width: 300px;
  background: var(--surface); color: var(--ink); border: 1px solid var(--ring); border-radius: var(--radius);
  box-shadow: 0 6px 24px rgba(11, 11, 11, 0.12); padding: 10px 12px; font-size: 13px; line-height: 1.45;
  opacity: 0; transition: opacity 0.1s ease;
}
.tooltip.on { opacity: 1; }
.tooltip .t-name { font-weight: 650; font-size: 14px; margin-bottom: 4px; }
.tooltip dl { display: grid; grid-template-columns: auto auto; gap: 2px 12px; margin: 0; }
.tooltip dt { color: var(--ink-2); }
.tooltip dd { margin: 0; text-align: right; font-variant-numeric: tabular-nums; }

/* legend */
.legend { font-size: 12px; color: var(--ink-2); }
.legend .ramp { height: 10px; border-radius: 0; }
.legend .ticks { display: flex; justify-content: space-between; margin-top: 4px; font-variant-numeric: tabular-nums; }
.legend .swatches { display: flex; flex-wrap: wrap; gap: 6px 14px; margin-top: 8px; }
.legend .sw { display: inline-flex; align-items: center; gap: 6px; }
.legend .sw i { width: 14px; height: 10px; display: inline-block; }

@media (max-width: 480px) {
  .topbar { gap: 12px; padding: 0 14px; }
  .topbar .brand { font-size: 15px; }
  .topbar nav { gap: 12px; }
  .topbar nav a { font-size: 13px; }
}
@media (max-width: 400px) {
  .topbar { flex-wrap: wrap; height: auto; min-height: 60px; row-gap: 2px; padding-top: 8px; padding-bottom: 8px; }
  .topbar nav { margin-left: 0; }
}

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