:root {
  color-scheme: light dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --bg: #fffdfb;
  --panel: #ffffff;
  --ink: #1f2733;
  --muted: #68707d;
  --line: rgba(31, 39, 51, .14);
  --soft: #f4f0e8;
  --accent: #2a4ea3;
  --blue: #4696ff;
  --green: #2e965c;
  --red: #c83c3c;
  --gold: #b77b16;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body { background: var(--bg); color: var(--ink); padding: 18px; }
body.dark {
  --bg: #15161a;
  --panel: #1f2126;
  --ink: #e9e6e1;
  --muted: #a4a198;
  --line: rgba(255, 255, 255, .13);
  --soft: #282b31;
  --accent: #d8a44a;
  --gold: #d8a44a;
  --blue: #78aaff;
  --green: #69bd83;
  --red: #e27a7a;
}

.shell { max-width: 1080px; margin: 0 auto; }
.demo-head { display: flex; justify-content: space-between; gap: 16px; align-items: end; margin-bottom: 14px; }
.eyebrow { margin: 0 0 4px; color: var(--accent); font-size: 11px; font-weight: 750; letter-spacing: .08em; text-transform: uppercase; }
h1 { margin: 0; font-size: clamp(18px, 3.2vw, 28px); line-height: 1.18; }
.lede { max-width: 520px; margin: 0; color: var(--muted); font-size: 13px; line-height: 1.55; }
.demo-grid { display: grid; grid-template-columns: minmax(0, 1fr) 250px; gap: 14px; align-items: start; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; box-shadow: 0 8px 30px rgba(0, 0, 0, .04); overflow: hidden; }
.canvas-card { padding: 10px; }
canvas { display: block; width: 100%; height: 470px; border-radius: 10px; background: var(--bg); touch-action: none; }
.controls { padding: 14px; display: grid; gap: 13px; }
.control { display: grid; gap: 5px; }
.control-row { display: flex; justify-content: space-between; gap: 10px; align-items: baseline; }
.control label, .control-title { color: var(--ink); font-size: 12px; font-weight: 680; }
.value { color: var(--accent); font-variant-numeric: tabular-nums; font-size: 11px; }
input[type="range"] { width: 100%; accent-color: var(--accent); }
select, input[type="number"], button {
  width: 100%; border: 1px solid var(--line); border-radius: 9px; background: var(--soft); color: var(--ink);
  padding: 8px 9px; font: inherit; font-size: 12px;
}
button { cursor: pointer; font-weight: 700; }
button:hover { border-color: var(--accent); }
.buttons { display: grid; grid-template-columns: 1fr 1fr; gap: 7px; }
.toggle { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--ink); }
.toggle input { accent-color: var(--accent); }
.stats { display: grid; grid-template-columns: 1fr 1fr; gap: 7px; }
.stat { padding: 8px; border-radius: 9px; background: var(--soft); min-width: 0; }
.stat b { display: block; color: var(--muted); font-size: 9px; letter-spacing: .04em; text-transform: uppercase; }
.stat span { display: block; margin-top: 3px; font-size: 13px; font-weight: 720; font-variant-numeric: tabular-nums; overflow: hidden; text-overflow: ellipsis; }
.cost-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 5px; }
.cost-grid input { min-width: 0; text-align: center; padding: 6px 2px; }
.observation { margin: 12px 0 0; border-left: 3px solid var(--accent); background: var(--soft); padding: 10px 12px; border-radius: 0 10px 10px 0; color: var(--muted); font-size: 12px; line-height: 1.55; }
.observation strong { color: var(--ink); }
.micro { margin: 0; font-size: 10px; line-height: 1.45; color: var(--muted); }
.wide { grid-column: 1 / -1; }

@media (max-width: 760px) {
  body { padding: 10px; }
  .demo-head { display: block; }
  .lede { margin-top: 8px; }
  .demo-grid { grid-template-columns: 1fr; }
  canvas { height: 390px; }
  .controls { grid-template-columns: 1fr 1fr; }
  .controls > .wide, .stats { grid-column: 1 / -1; }
}

@media (max-width: 460px) {
  canvas { height: 350px; }
  .controls { grid-template-columns: 1fr; }
  .controls > *, .stats { grid-column: auto; }
}