:root {
  --bg: #0a0a0b;
  --surface: #141417;
  --surface-2: #1a1a1e;
  --border: #26262c;
  --text: #e8e8eb;
  --muted: #8a8a92;
  --dim: #4a4a52;
  --accent: #f5f5f7;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, "Cascadia Mono", monospace;
  --sidebar-w: 300px;
  --statusbar-h: 34px;
  --radius: 3px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0; height: 100%;
  background: var(--bg); color: var(--text);
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.55;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Layout shell */
.app {
  display: flex;
  flex-direction: column;
  height: 100dvh;
}
.main {
  display: flex;
  flex: 1;
  min-height: 0;
}
.stage {
  position: relative;
  flex: 1;
  min-width: 0;
  background: var(--bg);
}
canvas {
  display: block;
  width: 100%; height: 100%;
}

/* Sidebar */
.sidebar {
  width: 0;
  background: var(--surface);
  overflow: hidden;
  border-left: 1px solid transparent;
  transition: width 220ms cubic-bezier(.2,.8,.2,1),
              border-color 220ms;
  flex-shrink: 0;
}
body.sidebar-open .sidebar {
  width: var(--sidebar-w);
  border-left-color: var(--border);
}
.sidebar-inner {
  width: var(--sidebar-w);
  height: 100%;
  overflow-y: auto;
  padding: 22px 22px 32px;
}
.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: -6px -6px 22px;
}
.sidebar-header .title {
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 6px;
}
.close-btn {
  width: 32px; height: 32px;
  display: grid; place-items: center;
  color: var(--muted);
  background: transparent;
  border: none;
  cursor: pointer;
  border-radius: var(--radius);
}
.close-btn:hover { color: var(--text); background: var(--surface-2); }
.close-btn svg { width: 16px; height: 16px; }

.section + .section { margin-top: 22px; padding-top: 22px; border-top: 1px solid var(--border); }
.section-label {
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--dim);
  margin-bottom: 12px;
}

.control { margin-bottom: 14px; }
.control:last-child { margin-bottom: 0; }
.control label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 13px;
}
.control label .val {
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

/* Form controls (dark mode) */
select {
  width: 100%;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
  font: inherit;
  font-size: 13px;
  padding: 9px 28px 9px 10px;
  border-radius: var(--radius);
  cursor: pointer;
  appearance: none;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--muted) 50%),
    linear-gradient(-45deg, transparent 50%, var(--muted) 50%);
  background-position: calc(100% - 14px) 52%, calc(100% - 9px) 52%;
  background-size: 5px 5px;
  background-repeat: no-repeat;
}
select:hover { border-color: var(--dim); }

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  background: transparent;
  height: 22px;
  cursor: pointer;
  margin: 0;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 2px;
  background: var(--border);
  border-radius: 1px;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px; height: 12px;
  background: var(--text);
  border-radius: 50%;
  margin-top: -5px;
  cursor: grab;
}
input[type="range"]::-moz-range-track {
  height: 2px;
  background: var(--border);
  border-radius: 1px;
}
input[type="range"]::-moz-range-thumb {
  width: 12px; height: 12px;
  background: var(--text);
  border-radius: 50%;
  border: none;
  cursor: grab;
}
input[type="range"]:active::-webkit-slider-thumb { cursor: grabbing; }
input[type="range"]:active::-moz-range-thumb { cursor: grabbing; }

.btn {
  width: 100%;
  font: inherit;
  font-size: 13px;
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 10px 12px;
  cursor: pointer;
  border-radius: var(--radius);
  transition: background 120ms, border-color 120ms, color 120ms;
}
.btn:hover:not(:disabled) { background: var(--bg); border-color: var(--dim); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn + .btn { margin-top: 8px; }
.btn.primary {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
  font-weight: 500;
}
.btn.primary:hover:not(:disabled) { background: #fff; border-color: #fff; }
.pause-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}
.pause-btn svg { width: 13px; height: 13px; display: block; flex-shrink: 0; }
.pause-btn .ic-play { display: none; }
body.paused #pauseToggle .ic-pause { display: none; }
body.paused #pauseToggle .ic-play { display: block; }

/* Corner icons (over canvas, top-right) */
.corner {
  position: absolute;
  top: 14px; right: 14px;
  display: flex;
  gap: 4px;
  z-index: 10;
}
.icon-btn {
  width: 36px; height: 36px;
  display: grid; place-items: center;
  color: var(--muted);
  background: rgba(10, 10, 11, 0.55);
  border: 1px solid rgba(38, 38, 44, 0.6);
  cursor: pointer;
  border-radius: var(--radius);
  text-decoration: none;
  transition: color 120ms, background 120ms, border-color 120ms;
}
.icon-btn:hover {
  color: var(--text);
  background: rgba(10, 10, 11, 0.85);
  border-color: var(--border);
}
.icon-btn svg { width: 19px; height: 19px; display: block; }

/* Axis labels (left edge of canvas) */
.axis-labels {
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 56px;
  pointer-events: none;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.04em;
  z-index: 5;
}
.axis-labels div {
  position: absolute;
  right: 8px;
  transform: translateY(50%);
  text-shadow: 0 0 6px #000, 0 0 3px #000, 0 1px 3px #000;
  font-variant-numeric: tabular-nums;
}

/* Landing */
.landing {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: var(--bg);
  z-index: 20;
}
.landing.hidden {
  pointer-events: none;
  opacity: 0;
  transition: opacity 220ms ease-out;
}
.landing-card {
  text-align: center;
  max-width: 600px;
  padding: 0 28px;
}
.landing-card .brand-mark {
  font-size: 14px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
}
.landing-card .brand-mark::before,
.landing-card .brand-mark::after {
  content: '';
  height: 1px;
  background: var(--border);
  width: 36px;
}
.landing-card h1 {
  font-size: 26px;
  font-weight: 500;
  margin: 0 0 16px;
  letter-spacing: -0.01em;
}
.landing-card p {
  color: var(--muted);
  margin: 0 0 18px;
  line-height: 1.65;
  font-size: 14px;
}
.landing-card p:last-of-type {
  margin-bottom: 32px;
}
.landing-card p a {
  color: var(--text);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-decoration-color: var(--dim);
  text-underline-offset: 3px;
}
.landing-card p a:hover {
  text-decoration-color: var(--muted);
}
.start-btn {
  font: inherit;
  font-size: 14px;
  font-weight: 500;
  background: var(--text);
  color: var(--bg);
  border: none;
  padding: 14px 32px;
  cursor: pointer;
  border-radius: var(--radius);
  letter-spacing: 0.02em;
  transition: background 120ms, transform 120ms;
}
.start-btn:hover {
  background: #fff;
  transform: translateY(-1px);
}
.start-btn:active { transform: translateY(0); }
.landing-card .footnote {
  margin-top: 24px;
  font-size: 12px;
  color: var(--dim);
  letter-spacing: 0.04em;
  line-height: 1.7;
}
.landing-card .footnote .err {
  color: #d96f6f;
}

/* Status bar */
.statusbar {
  height: var(--statusbar-h);
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 0 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.04em;
  flex-shrink: 0;
}
.statusbar .brand {
  color: var(--text);
  text-decoration: none;
}
.statusbar .brand:hover { color: #fff; }
.statusbar .stats {
  display: flex;
  gap: 22px;
  font-variant-numeric: tabular-nums;
}
.statusbar .stats > span { white-space: nowrap; }
.statusbar .live {
  color: var(--muted);
}
.statusbar .live::before {
  content: '';
  display: inline-block;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #4ade80;
  margin-right: 8px;
  transform: translateY(-1px);
}
body.paused .statusbar .live { color: var(--text); }
body.paused .statusbar .live::before { background: var(--muted); }

/* Visibility tied to mic state */
body:not(.mic-on) .corner,
body:not(.mic-on) .axis-labels { visibility: hidden; }
body:not(.mic-on) .statusbar { display: none; }

/* Mobile sidebar = top sheet, sizes to content, leaves low frequencies visible below */
@media (max-width: 600px) {
  .sidebar {
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    bottom: auto;
    width: auto;
    max-height: 85dvh;
    transform: translateY(-100%);
    transition: transform 240ms cubic-bezier(.2,.8,.2,1);
    border-left: none;
    border-bottom: 1px solid var(--border);
    border-bottom-left-radius: 14px;
    border-bottom-right-radius: 14px;
    z-index: 100;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  }
  body.sidebar-open .sidebar {
    transform: translateY(0);
    width: auto;
  }
  .sidebar-inner {
    width: auto;
    height: auto;
    max-height: 85dvh;
    padding: 20px 22px 24px;
  }

  .statusbar { padding: 0 12px; font-size: 11px; }
  .statusbar .brand { display: none; }
  .statusbar .stats {
    gap: 14px;
    flex: 1;
    justify-content: space-between;
  }
}