/* EngineeringHumanity charts: dark shell, light plot canvas */

:root {
  color-scheme: dark;
  --bg: #08090d;
  --surface: #11141b;
  --surface-2: #161a23;
  --border: #222836;
  --border-strong: #2f3748;
  --text: #e8ebf3;
  --text-dim: #a4adbf;
  --text-faint: #6c7589;
  --accent: #8b7bff;
  --accent-2: #3dd6f5;
  --warn-bg: rgba(255, 196, 87, 0.08);
  --warn-border: rgba(255, 196, 87, 0.35);
  --warn-text: #ffe2a8;
  --radius: 14px;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg) radial-gradient(1000px 480px at 10% -10%, rgba(139, 123, 255, 0.12), transparent 60%) no-repeat;
  color: var(--text);
  font: 15px/1.6 var(--font);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent-2); text-underline-offset: 3px; }
.wrap { width: 100%; max-width: 1400px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 28px; } }

.site-header { border-bottom: 1px solid var(--border); background: rgba(8, 9, 13, 0.8); }
.site-header .wrap { display: flex; align-items: center; gap: 16px; min-height: 58px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 650; }
.brand-mark { width: 24px; height: 24px; border-radius: 7px; background: linear-gradient(135deg, var(--accent), var(--accent-2)); }
.crumb { color: var(--text-faint); font-size: 14px; }
.crumb a { color: var(--text-dim); text-decoration: none; }
.crumb a:hover { color: var(--text); }

main { padding: 32px 0 48px; flex: 1; }
.eyebrow { font: 600 12px/1 var(--mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent-2); }
h1 { font-size: clamp(26px, 4vw, 40px); line-height: 1.1; letter-spacing: -0.02em; margin: 12px 0 10px; }
.lede { color: var(--text-dim); max-width: 760px; margin: 0; }

.note {
  margin: 20px 0 0;
  padding: 12px 14px;
  max-width: 860px;
  border: 1px solid var(--warn-border);
  background: var(--warn-bg);
  color: var(--warn-text);
  border-radius: 10px;
  font-size: 13.5px;
}
.note strong { color: #fff3d6; }

/* gallery */
.gallery { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); margin-top: 28px; }
.tile {
  display: block;
  padding: 20px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: linear-gradient(180deg, var(--surface-2), var(--surface));
  color: var(--text);
  text-decoration: none;
  transition: transform 0.2s, border-color 0.2s;
}
.tile:hover { transform: translateY(-2px); border-color: var(--border-strong); }
.tile h2 { margin: 0 0 6px; font-size: 18px; }
.tile p { margin: 0; color: var(--text-dim); font-size: 14px; }
.tile .meta { margin-top: 12px; font: 12px var(--mono); color: var(--text-faint); }
.tile.soon { opacity: 0.55; pointer-events: none; }

/* chart page */
.chart-layout { display: grid; gap: 16px; margin-top: 24px; }
@media (min-width: 980px) { .chart-layout { grid-template-columns: 280px minmax(0, 1fr); align-items: start; } }
@media (max-width: 979px) { .chart-card { order: -1; height: 70vh; } }  /* chart first on narrow screens */
.controls {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}
.controls h2 { font: 600 11.5px/1 var(--mono); letter-spacing: 0.13em; text-transform: uppercase; color: var(--text-faint); margin: 0 0 10px; }
.controls h2:not(:first-child) { margin-top: 18px; }
.controls label { display: flex; align-items: center; gap: 9px; padding: 3px 0; font-size: 14px; color: var(--text-dim); cursor: pointer; }
.controls label:hover { color: var(--text); }
.controls input { accent-color: var(--accent); width: 16px; height: 16px; margin: 0; }
.controls .row { display: flex; gap: 8px; margin-top: 8px; }
.controls button {
  font: 600 12.5px var(--font);
  color: var(--text-dim);
  background: var(--surface-2);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  padding: 5px 10px;
  cursor: pointer;
}
.controls button:hover { color: var(--text); }
.chart-card {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  background: #eeeeee;
  height: min(78vh, 900px);
  min-height: 460px;
  position: relative;
}
#chart { width: 100%; height: 100%; }
.loading { position: absolute; inset: 0; display: grid; place-items: center; color: #555; font-size: 14px; }
.hint { color: var(--text-faint); font-size: 12.5px; margin-top: 10px; }

.site-footer { border-top: 1px solid var(--border); padding: 22px 0 30px; color: var(--text-faint); font-size: 13px; }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 8px 20px; justify-content: space-between; }
.site-footer a { color: var(--text-dim); text-decoration: none; }
.site-footer a:hover { color: var(--text); }