:root {
  color-scheme: dark;
  --bg: #0b1020;
  --panel: #121a2f;
  --line: #26304f;
  --text: #eef2ff;
  --muted: #98a9cf;
  --accent: #38bdf8;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; min-height: 100vh; background: radial-gradient(ellipse at 20% 10%, rgba(56,189,248,.06), transparent 55%), var(--bg); color: var(--text); font: 16px Inter, system-ui, sans-serif; }
.topbar { display: flex; justify-content: space-between; gap: 1rem; padding: .85rem max(1rem, calc((100vw - 1200px) / 2)); border-bottom: 1px solid var(--line); }
.topbar a { color: var(--text); text-decoration: none; }
.topbar-name { font-weight: 600; font-size: .95rem; }
.topbar .home-link { color: var(--muted); font-size: .85rem; }
.topbar a:hover { color: var(--accent); }
main { max-width: 1200px; margin: auto; padding: 0 1.5rem 3rem; }
.hero { padding: clamp(2rem, 5vw, 3.5rem) 0 2rem; max-width: 750px; }
.eyebrow { margin: 0 0 1rem; color: var(--accent); font-size: .75rem; letter-spacing: .18em; text-transform: uppercase; }
h1 { margin: 0 0 1rem; font: 700 clamp(2.2rem, 5vw, 3.5rem)/1.12 Georgia, serif; }
.lead { margin: 0; color: #c7d4f0; line-height: 1.7; }
.viewer { overflow: hidden; background: var(--panel); border: 1px solid var(--line); border-radius: 14px; }
.viewer-header, .viewer-footer { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1.2rem 1.5rem; }
.viewer-header { border-bottom: 1px solid var(--line); }
h2 { margin: 0 0 .25rem; font-size: .8rem; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; }
.viewer-note, .viewer-footer, .explanation { color: var(--muted); font-size: .85rem; line-height: 1.6; }
.viewer-note { margin: 0; }
.controls { display: flex; align-items: end; gap: .6rem; }
.controls label { display: grid; gap: .4rem; color: var(--muted); font-size: .75rem; }
.controls input { width: 7rem; border: 1px solid var(--line); border-radius: 8px; padding: .65rem .7rem; background: #18223d; color: var(--text); font: 600 .85rem Inter, system-ui, sans-serif; }
.controls select { width: 11rem; border: 1px solid var(--line); border-radius: 8px; padding: .65rem .7rem; background: #18223d; color: var(--text); font: 600 .85rem Inter, system-ui, sans-serif; cursor: pointer; }
.controls input:disabled, .controls select:disabled { opacity: .65; }
button { border: 1px solid var(--line); border-radius: 8px; padding: .7rem 1rem; background: #18223d; color: var(--text); font: 600 .85rem Inter, system-ui, sans-serif; cursor: pointer; }
button:hover { border-color: var(--accent); }
button.primary { background: var(--accent); border-color: var(--accent); color: #0b1020; min-width: 7rem; }
button.primary:hover { background: #7dd3fc; }
button:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
input:focus-visible, select:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.stage { position: relative; height: clamp(360px, 58vw, 610px); background: #0e1729; }
canvas { display: block; width: 100%; height: 100%; }
.stage-label { position: absolute; left: 1.5rem; bottom: 1.2rem; color: #7484a8; font-size: .64rem; letter-spacing: .17em; pointer-events: none; }
.legend { display: flex; flex-wrap: wrap; gap: .5rem 1rem; padding: .85rem 1.5rem; border-top: 1px solid var(--line); color: var(--muted); font-size: .75rem; }
.legend span { display: inline-flex; align-items: center; gap: .35rem; }
.legend span::before { content: ''; width: .65rem; height: .65rem; border-radius: 50%; background: var(--pendulum-color); }
.viewer-footer { border-top: 1px solid var(--line); }
.viewer-footer #status { color: var(--accent); }
.explanation { margin: 1.25rem 0 0; max-width: 780px; }
@media (max-width: 900px) {
  .viewer-header { align-items: stretch; flex-direction: column; }
  .controls { flex-wrap: wrap; }
}
@media (max-width: 600px) {
  main { padding-inline: 1rem; }
  .topbar { padding-inline: 1rem; }
  .controls label { width: 100%; }
  .controls input, .controls select { width: 100%; }
  .controls button { flex: 1; }
  .viewer-footer { flex-wrap: wrap; }
  .stage { height: clamp(360px, 100vw, 500px); }
}