: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; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

.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; }
.mode-readout { justify-self: end; display: flex; align-items: center; gap: 9px; color: var(--muted); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; }
.mode-readout > span { width: 9px; height: 9px; transform: rotate(45deg); background: var(--muted); }
.mode-readout > span.rm { background: var(--red); }
.mode-readout strong { color: var(--paper); }

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; }
.harmonics-panel { margin-top: 20px; padding: 28px; }
.modulation-panel { margin-top: 20px; padding: 28px; }
.section-heading { display: grid; grid-template-columns: 1fr minmax(260px, 430px); align-items: end; gap: 36px; margin-bottom: 26px; }
.section-heading .eyebrow { margin-bottom: 7px; }
.section-heading > p { margin-bottom: 0; color: var(--muted); font-size: 14px; line-height: 1.55; }
.harmonics { display: grid; grid-template-columns: repeat(12, minmax(52px, 1fr)); gap: 6px; padding: 22px 10px 16px; overflow-x: auto; background: var(--surface-deep); }
.harmonic { display: grid; grid-template-rows: 20px 150px 18px 18px; justify-items: center; gap: 6px; min-width: 52px; }
.harmonic output { font-size: 10px; text-align: center; }
.harmonic input { width: 140px; height: 22px; margin: 64px -44px; transform: rotate(-90deg); }
.harmonic strong { font-size: 11px; letter-spacing: .08em; }
.harmonic small { color: var(--muted); font-size: 9px; font-variant-numeric: tabular-nums; }
.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); }
.presets .accent { border-color: var(--red); color: var(--red); }

.parameter-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.parameter { min-width: 0; padding: 20px; border: 1px solid var(--line); background: var(--surface-deep); }
.parameter > span { display: block; color: var(--muted); font-size: 11px; font-style: normal; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.parameter i { color: var(--red); font-family: Georgia, serif; font-size: 1.15em; font-style: italic; text-transform: none; }
.parameter strong { display: block; margin: 9px 0 20px; font-size: 25px; font-weight: 500; }
.parameter strong output { font-size: inherit; }
.parameter input { width: 100%; }
.parameter small { display: flex; justify-content: space-between; gap: 12px; min-height: 31px; margin-top: 15px; color: var(--muted); font-size: 11px; line-height: 1.4; }
.components { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 12px; border: 1px solid var(--line); }
.components span { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 13px 16px; color: var(--muted); font-size: 12px; }
.components span + span { border-left: 1px solid var(--line); }
.components i { color: var(--red); font-family: Georgia, serif; font-size: 15px; }
.components strong { color: var(--paper); font-variant-numeric: tabular-nums; }
.modulation-panel .presets { padding-top: 18px; border-top: 1px solid var(--line); }
.mode-selector { display: inline-flex; margin-bottom: 14px; border: 1px solid var(--line); }
.mode-selector button { min-height: 38px; padding: 8px 16px; border: 0; background: transparent; color: var(--muted); cursor: pointer; }
.mode-selector button + button { border-left: 1px solid var(--line); }
.mode-selector button[aria-pressed="true"] { background: var(--red); color: #111; font-weight: 700; }
.fm-components i { white-space: nowrap; }
.fm-workspace { display: grid; grid-template-columns: minmax(390px,.9fr) minmax(0,1.1fr); align-items: start; gap: 20px; margin-top: 20px; }
.fm-workspace .modulation-panel,.fm-workspace .visuals { margin-top: 0; }
.fm-workspace .visuals { grid-template-columns: 1fr; }
.fm-workspace .section-heading { grid-template-columns: 1fr; gap: 10px; margin-bottom: 18px; }
.fm-workspace .parameter-grid { grid-template-columns: 1fr; gap: 0; border-top: 1px solid var(--line); }
.fm-workspace .parameter { display: grid; grid-template-columns: minmax(105px,.7fr) auto minmax(135px,1fr); align-items: center; gap: 7px 12px; padding: 12px 0; border: 0; border-bottom: 1px solid var(--line); background: transparent; }
.fm-workspace .parameter strong { margin: 0; font-size: 18px; }
.fm-workspace .parameter input { grid-column: 3; }
.fm-workspace .parameter small { grid-column: 1 / -1; min-height: 0; margin: 0; }
.fm-workspace .components { margin-top: 14px; }
.fm-workspace .components span { display: grid; justify-content: start; gap: 4px; padding: 10px; }
.fm-workspace .presets { margin-top: 14px; padding-top: 14px; }
.fm-workspace .visual { padding: 16px; }
@media(max-width:960px){.fm-workspace{grid-template-columns:1fr}.fm-workspace .visuals{grid-template-columns:1fr}.fm-workspace .parameter{grid-template-columns:minmax(105px,.5fr) auto minmax(160px,1fr)}}
@media(max-width:620px){.fm-workspace .parameter{grid-template-columns:1fr auto}.fm-workspace .parameter input,.fm-workspace .parameter small{grid-column:1/-1}.fm-workspace .components{grid-template-columns:repeat(3,1fr)}.fm-workspace .components span+span{border-top:0;border-left:1px solid var(--line)}}

.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; }
.legend { display: flex; gap: 18px; margin-top: 10px; color: var(--muted); font-size: 10px; text-transform: uppercase; }
.legend span { display: flex; align-items: center; gap: 7px; }
.legend i { display: block; width: 18px; height: 2px; }
.line-white { background: var(--paper); }
.line-red { background: var(--red); }
.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; }
  .section-heading, .visuals { grid-template-columns: 1fr; }
  .section-heading { gap: 14px; }
  .harmonics { grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 14px 2px; overflow-x: visible; padding-inline: 4px; }
  .harmonic { min-width: 0; }
  .parameter-grid { grid-template-columns: 1fr; }
}

@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%; }
  .mode-readout { justify-self: start; }
  .horizontal-control { grid-template-columns: 1fr 56px; }
  .horizontal-control > span { grid-column: 1 / -1; }
  .harmonics-panel { padding: 20px 14px; }
  .modulation-panel { padding: 20px 14px; }
  .components { grid-template-columns: 1fr; }
  .components span + span { border-top: 1px solid var(--line); border-left: 0; }
  .explanation { margin-top: 52px; }
  .explanation-grid { grid-template-columns: 1fr; gap: 22px; margin-top: 28px; }
}

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