:root {
  --bg: #111111;
  --surface: #181818;
  --surface-deep: #0c0c0c;
  --paper: #f7f3eb;
  --red: #ef3526;
  --muted: #b7b5b0;
  --line: #393936;
  color: var(--paper);
  background: var(--bg);
  font-family: Arial, Helvetica, sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { color-scheme: dark; }
body { margin: 0; min-width: 320px; background: var(--bg); }
button, input { font: inherit; }
button { color: inherit; }
a { color: inherit; }
h1, h2, p { margin-top: 0; }

.skip { position: fixed; top: -80px; left: 16px; z-index: 10; padding: 12px 16px; background: var(--paper); color: var(--bg); }
.skip:focus { top: 16px; }

.app-header { max-width: 1320px; margin: auto; padding: 18px 32px; border-bottom: 1px solid var(--line); display: flex; justify-content: space-between; align-items: center; gap: 24px; }
.app-header a { display: inline-flex; }
.app-header span { color: var(--muted); font-size: 12px; font-weight: 600; letter-spacing: .13em; text-transform: uppercase; }
.brand { width: 195px; height: 65px; object-fit: contain; }

.wrap { max-width: 1240px; margin: auto; padding: 0 32px 80px; }
.intro { padding: 70px 0 44px; }
.eyebrow { margin-bottom: 18px; color: var(--muted); font-size: 12px; font-weight: 700; letter-spacing: .13em; line-height: 1.5; }
h1 { margin-bottom: 24px; font-size: clamp(3.4rem, 7vw, 6.6rem); font-weight: 600; letter-spacing: -.06em; line-height: .94; }
h1 span { color: var(--red); }
h2 { margin-bottom: 0; font-size: clamp(1.45rem, 2.3vw, 2.2rem); font-weight: 500; letter-spacing: -.03em; }
.lead { max-width: 760px; margin-bottom: 0; color: var(--muted); font-size: clamp(1.05rem, 2vw, 1.25rem); line-height: 1.65; }

.panel { border: 1px solid var(--line); background: var(--surface); }
.transport { display: grid; grid-template-columns: auto 1fr 1fr; align-items: center; gap: 28px; padding: 20px; }
.play { min-width: 158px; min-height: 50px; border: 1px solid var(--red); background: var(--red); color: #111; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; cursor: pointer; }
.play[aria-pressed="true"] { border-color: #777; background: #111; color: var(--paper); }
.play:hover { filter: brightness(1.12); }
.horizontal-control { display: grid; grid-template-columns: auto minmax(90px, 1fr) 64px; align-items: center; gap: 12px; min-width: 0; }
.horizontal-control > span { color: var(--muted); font-size: 11px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
output { font-size: 12px; font-variant-numeric: tabular-nums; text-align: right; }

.volume-control { max-width: 520px; }

input[type="range"] { accent-color: var(--red); cursor: pointer; }
input[type="range"]:focus-visible, button:focus-visible, a:focus-visible { outline: 3px solid var(--red); outline-offset: 4px; }
.presets { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.presets button { min-height: 36px; padding: 7px 12px; border: 1px solid #555; background: transparent; color: var(--muted); font-size: 11px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; cursor: pointer; }
.presets button:hover { border-color: var(--red); color: var(--paper); }

.visuals { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 20px; }
.visual { min-width: 0; padding: 20px; background: var(--surface-deep); }
.visual-heading { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; margin-bottom: 14px; }
.visual-heading h2 { font-size: 14px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.visual-heading span { color: var(--muted); font-size: 10px; text-transform: uppercase; }
canvas { display: block; width: 100%; height: auto; aspect-ratio: 3 / 1; }
.axis-note { margin: 10px 0 0; color: var(--muted); font-size: 10px; text-transform: uppercase; }

.explanation { margin-top: 72px; padding-top: 34px; border-top: 1px solid var(--line); }
.explanation > h2 { max-width: 690px; font-size: clamp(2rem, 4vw, 3.4rem); }
.explanation-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 38px; margin-top: 38px; }
.explanation-grid p { margin-bottom: 0; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: 15px; line-height: 1.7; }
.explanation-grid strong { color: var(--paper); }
.app-footer { max-width: 1240px; margin: auto; padding: 30px 32px; border-top: 1px solid var(--line); color: var(--muted); font-size: 11px; letter-spacing: .13em; text-align: center; text-transform: uppercase; }

@media (max-width: 840px) {
  .transport { grid-template-columns: 1fr 1fr; }
  .play { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
  .app-header { padding: 12px 22px; }
  .app-header span { display: none; }
  .brand { width: 150px; height: 50px; }
  .wrap { padding: 0 22px 56px; }
  .intro { padding: 48px 0 34px; }
  .transport { grid-template-columns: 1fr; gap: 20px; }
  .play { grid-column: auto; width: 100%; }
  .horizontal-control { grid-template-columns: 1fr 56px; }
  .horizontal-control > span { grid-column: 1 / -1; }
  .explanation { margin-top: 52px; }
  .explanation-grid { grid-template-columns: 1fr; gap: 22px; margin-top: 28px; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
}

 .controls { min-width: 0; padding: 24px; }
.controls h3 { margin: 24px 0 8px; font-size: 12px; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); }
.controls .presets { margin-top: 8px; }
.presets button[aria-pressed="true"] { background: var(--red); color: #111; border-color: var(--red); }
.control { display: grid; grid-template-columns: 1fr auto; gap: 12px; margin-top: 24px; font-size: 13px; }
.control input { grid-column: 1 / -1; width: 100%; min-width: 0; min-height: 28px; }
.control output { font-size: 13px; }
#reset { margin-top: 24px; padding: 12px; border: 1px solid var(--line); background: var(--surface-deep); color: var(--paper); cursor: pointer; }
.graph-note { color: var(--muted); font-size: 12px; line-height: 1.6; margin: 16px 0 0; min-height: 38px; }
#status { margin: 0; color: var(--muted); font-size: 12px; }
footer[aria-label] { text-align: center; padding: 0 16px 24px; font-size: 12px; color: var(--muted); }
.lfo-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 20px; }
.presets button { min-height: 44px; }
@media (max-width: 760px) { .lfo-layout, .visuals { grid-template-columns: 1fr; } }
@media (max-width: 850px) { .intro { padding-top: 40px; } h1 { font-size: clamp(2.7rem, 9vw, 4.6rem); } }

/* Original stacked visualizers: a compact LFO above a wide modulated signal. */
.visuals { grid-template-columns: 1fr; gap: 16px; }
.visuals .visual { padding: 16px; }
.visual-heading h2 { font-size: 12px; }
.visuals svg { display: block; width: 100%; }
#lfo-graph { height: 80px; }
#audio-graph { height: 192px; }
.graph-axis { display: flex; justify-content: space-between; gap: 12px; margin-top: 8px; color: var(--muted); font-size: 10px; }
.visuals .graph-note { min-height: 0; margin-top: 12px; font-size: 11px; }
@media (max-width: 620px) {
  #lfo-graph { height: 64px; }
  #audio-graph { height: 160px; }
  .visual-heading { flex-wrap: wrap; gap: 8px; }
}

.time-controls { padding: 18px; }
.time-controls label { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; font-size: 14px; }
.time-controls select { padding: 10px; background: var(--surface-deep); color: var(--paper); border: 1px solid var(--line); font: inherit; }
.time-controls p { margin: 12px 0 0; color: var(--muted); font-size: 12px; line-height: 1.6; }
.time-controls select:focus-visible { outline: 3px solid var(--red); outline-offset: 3px; }