/* The home page's palette: dark by default, light when its theme toggle stored "light". */
:root {
  color-scheme: dark;
  --bg: #050816; --card: #020617; --header: rgba(15, 23, 42, 0.95);
  --fg: #f9fafb; --muted: #9ca3af; --line: #1f2937;
  --btn: #0b1224; --btn-on: #f9fafb; --btn-on-fg: #050816;
  --up: #ff5c8a; --down: #5aa9f0; --accent: #22d3ee;
}
:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f9fafb; --card: #ffffff; --header: #e5e7eb;
  --fg: #0f172a; --muted: #6b7280; --line: #d1d5db;
  --btn: #ffffff; --btn-on: #0f172a; --btn-on-fg: #ffffff;
  --up: #d6084a; --down: #1a73c9; --accent: #0891b2;
}
* { box-sizing: border-box; }
.site-header { position: sticky; top: 0; z-index: 10; display: flex; align-items: center;
               justify-content: space-between; gap: 12px; padding: 10px 16px;
               background: var(--header); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: inherit; }
.brand img { border-radius: 50%; }
.brand strong, .brand small { display: block; line-height: 1.2; }
.brand small { font-size: 0.78rem; color: var(--muted); }
.site-header nav { display: flex; gap: 4px; }
.site-header nav a { padding: 5px 11px; border-radius: 999px; font-size: 0.9rem; text-decoration: none;
                     color: inherit; opacity: 0.85; }
.site-header nav a:hover, .site-header nav a.active { background: rgba(148, 163, 184, 0.16); opacity: 1; }
.study-cta { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px;
             margin-top: 28px; padding: 16px 18px; border: 1px solid var(--line); border-radius: 14px;
             background: var(--card); color: inherit; text-decoration: none; color: var(--muted); }
.study-cta strong { display: block; color: var(--fg); font-size: 1.05rem; margin-bottom: 2px; }
.study-cta > span:first-child { flex: 1 1 280px; }
.study-cta-btn { padding: 8px 16px; border-radius: 999px; font-weight: 600; white-space: nowrap;
                 background: var(--btn-on); color: var(--btn-on-fg); }
.study-cta:hover { border-color: var(--accent); }
@media (max-width: 480px) {
  .brand small { display: none; }
  .site-header nav a { padding: 5px 8px; font-size: 0.85rem; }
}
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.55 system-ui, -apple-system, sans-serif; }
.demo { max-width: 860px; margin: 0 auto; padding: 24px 16px 48px; }
h1 { font-size: 1.6rem; margin: 0 0 8px; }
.lead, .foot { color: var(--muted); }
.foot { font-size: 0.85rem; margin-top: 24px; }
a { color: inherit; }
.up { color: var(--up); font-weight: 600; }
.down { color: var(--down); font-weight: 600; }
.controls { display: grid; gap: 10px; margin: 16px 0; }
.group, .slider { display: grid; grid-template-columns: 80px 1fr auto; align-items: center; gap: 8px; }
.group .row { grid-column: 2 / 4; }
.label { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
.value { font-variant-numeric: tabular-nums; min-width: 9ch; text-align: right; font-size: 0.9rem; }
.row { display: flex; flex-wrap: wrap; gap: 6px; }
button { font: inherit; font-size: 0.9rem; padding: 5px 11px; border: 1px solid var(--line);
         border-radius: 999px; background: var(--btn); color: var(--fg); cursor: pointer; }
button[aria-pressed="true"] { background: var(--btn-on); color: var(--btn-on-fg); border-color: var(--btn-on); }
input[type="range"] { width: 100%; }
[hidden] { display: none !important; }
.controls { max-width: 560px; }
#info { font-variant-numeric: tabular-nums; margin: 4px 0 12px; }
.panels { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.panel { margin: 0; min-width: 0; }
.panel-title { margin-bottom: 6px; }
.panel-title strong { display: block; font-size: 1.1rem; }
.panel-title span { display: block; font-size: 0.8rem; color: var(--muted);
                    white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
canvas { display: block; width: 100%; aspect-ratio: 1; border-radius: 10px;
         image-rendering: pixelated; cursor: crosshair; }
.panel-info { font-size: 0.9rem; font-variant-numeric: tabular-nums; min-height: 4.5em; margin: 8px 0 0; }
.panel-info .big { font-size: 1.2rem; font-weight: 600; }
.auc { color: var(--muted); }
.auc.best { color: var(--fg); font-weight: 600; }
.auc.best::after { content: " ✓ higher"; color: var(--up); font-weight: 600; }
@media (max-width: 480px) {
  .panels { gap: 10px; }
  .panel-title span { display: none; }
  .panel-info { font-size: 0.8rem; }
}