:root {
  --bg: #ffffff;
  --ink: #111111;
  --muted: #8a8a8a;
  --hair: #ececec;
  --donut: #d4a017;
}
* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg); color: var(--ink);
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  -webkit-font-smoothing: antialiased;
}
body {
  min-height: 100vh;
  display: flex; flex-direction: column; align-items: center;
  padding: 40px 24px 48px;
}

header {
  width: 100%; max-width: 1100px;
  display: flex; align-items: baseline; justify-content: space-between;
  font-size: 13px;
}
header .title {
  font-weight: 700; font-size: 15px;
}
header .title .title-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  margin-right: 8px;
  color: var(--donut);
  transform: translateY(3px);
  transition: color .35s ease;
}
header .title .title-icon svg {
  display: block;
  width: 18px;
  height: 18px;
}
header .meta {
  color: var(--muted); font-size: 12px;
  letter-spacing: 0.08em; text-transform: uppercase;
}

/* mode toggle (header) */
.modes {
  display: inline-flex; gap: 0;
  border: 1px solid var(--hair);
  border-radius: 999px;
  padding: 3px;
  background: var(--panel, #fff);
}
.modes .mode {
  font: inherit; font-size: 11px;
  padding: 6px 14px;
  border: none; background: transparent;
  color: var(--muted);
  cursor: pointer;
  border-radius: 999px;
  letter-spacing: 0.12em; text-transform: uppercase;
  transition: background-color .18s ease, color .18s ease;
}
.modes .mode[aria-pressed="true"] {
  background: var(--ink);
  color: var(--bg);
}
.modes .mode:hover:not([aria-pressed="true"]) { color: var(--ink); }

/* disco mode body vibe */
body.disco {
  background: radial-gradient(ellipse at 50% 40%, #1a0033 0%, #050010 70%) !important;
  color: #fff;
}
body.disco .modes { background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.12); }
body.disco .modes .mode { color: rgba(255,255,255,0.55); }
body.disco .modes .mode[aria-pressed="true"] { background: #fff; color: #000; }
body.disco pre.donut {
  text-shadow:
    0 0 8px currentColor,
    0 0 22px currentColor,
    0 0 40px currentColor;
}

/* full-screen flash overlay for disco strobe */
#flash {
  position: fixed; inset: 0;
  pointer-events: none;
  z-index: 90;
  mix-blend-mode: screen;
  opacity: 0;
  background: #fff;
  transition: opacity 60ms linear, background-color 80ms linear;
}

/* screen-shake wrapper */
body.disco main { will-change: transform; }

/* --- epilepsy warning modal --- */
#warn {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.82);
  display: none;
  align-items: center; justify-content: center;
  z-index: 1000;
  padding: 24px;
  backdrop-filter: blur(4px);
}
#warn.on { display: flex; }
#warn .card {
  max-width: 440px; width: 100%;
  background: #0a0a0a; color: #fff;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 14px;
  padding: 28px 28px 24px;
  font-family: "JetBrains Mono", ui-monospace, monospace;
}
#warn .badge {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 10px; letter-spacing: 0.22em; text-transform: uppercase;
  color: #ffb800;
  margin-bottom: 14px;
}
#warn .badge::before {
  content: "";
  display: inline-block;
  width: 8px; height: 8px;
  background: #ffb800;
  transform: rotate(45deg);
}
#warn h2 {
  margin: 0 0 10px;
  font-size: 20px; font-weight: 700;
  letter-spacing: -0.01em;
}
#warn p {
  margin: 0 0 8px;
  font-size: 13px; line-height: 1.55;
  color: rgba(255,255,255,0.78);
}
#warn ul {
  margin: 10px 0 18px; padding: 0 0 0 16px;
  font-size: 12px; line-height: 1.7;
  color: rgba(255,255,255,0.65);
}
#warn .actions {
  display: flex; gap: 10px; margin-top: 18px;
}
#warn button {
  flex: 1;
  font: inherit; font-size: 12px;
  padding: 12px 14px;
  border-radius: 8px; cursor: pointer;
  letter-spacing: 0.08em; text-transform: uppercase;
  border: 1px solid rgba(255,255,255,0.2);
}
#warn .cancel {
  background: transparent; color: rgba(255,255,255,0.7);
}
#warn .cancel:hover { color: #fff; border-color: rgba(255,255,255,0.4); }
#warn .proceed {
  background: #ffb800; color: #000; border-color: #ffb800;
  font-weight: 700;
}
#warn .proceed:hover { background: #ffcc3e; }

main {
  flex: 1; width: 100%;
  display: flex; align-items: center; justify-content: center;
  padding: 24px 0;
}

.stage {
  display: flex; flex-direction: column;
  align-items: center; gap: 32px;
}

/* particle layer */
.donut-wrap {
  position: relative;
  display: inline-block;
}
.donut-wrap canvas {
  position: absolute;
  top: 0; left: 50%;
  transform: translateX(-50%);
  pointer-events: none;
  display: none;
}
body.disco .donut-wrap canvas { display: block; }
body.disco pre.donut { position: relative; z-index: 1; }

pre.donut {
  margin: 0;
  padding: 12px 0;
  color: var(--donut);
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-weight: 500;
  font-size: 13px;
  line-height: 1.0;
  white-space: pre;
  user-select: none;
  text-shadow: 0 0 0.5px currentColor;
  transition: color .35s ease;
}

/* ---------- controls panel ---------- */
.panel {
  display: flex; flex-direction: column; align-items: center;
  gap: 18px; width: 100%; max-width: 560px;
}

.row {
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  width: 100%;
}
.row .label {
  font-size: 10px; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--muted);
}

/* swatches */
.swatches {
  display: flex; gap: 12px;
  padding: 9px 12px;
  border: 1px solid var(--hair);
  border-radius: 999px;
  background: transparent;
}
.swatch {
  width: 22px; height: 22px; border-radius: 50%;
  border: 1px solid rgba(0,0,0,0.06);
  cursor: pointer; padding: 0; background: transparent;
  position: relative; transition: transform .15s ease;
}
.swatch:hover { transform: scale(1.08); }
.swatch[aria-pressed="true"]::after {
  content: ""; position: absolute; inset: -5px;
  border: 1px solid var(--ink); border-radius: 50%;
}
.swatch .fill {
  position: absolute; inset: 0; border-radius: 50%;
  background: var(--c);
}
.swatch-cycle .fill {
  background: conic-gradient(
    hsl(0 85% 52%),
    hsl(72 85% 50%),
    hsl(144 80% 46%),
    hsl(216 85% 52%),
    hsl(288 85% 52%),
    hsl(0 85% 52%)
  );
}
.swatch-cycle[aria-pressed="true"]::after {
  border-style: dashed;
}

/* disco: hide color bar row (JS also sets class for clarity) */
body.disco .panel > .row.color-row {
  display: none;
}

/* slider */
.slider-wrap {
  display: flex; align-items: center; gap: 14px;
  width: 100%; max-width: 420px;
}
.slider-wrap .ends {
  font-size: 10px; color: var(--muted);
  letter-spacing: 0.18em; text-transform: uppercase;
}
input[type="range"] {
  -webkit-appearance: none; appearance: none;
  flex: 1; height: 2px; background: var(--hair);
  border-radius: 2px; outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--ink); cursor: pointer;
  border: 3px solid var(--bg);
  box-shadow: 0 0 0 1px var(--ink);
}
input[type="range"]::-moz-range-thumb {
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--ink); cursor: pointer;
  border: 3px solid var(--bg);
  box-shadow: 0 0 0 1px var(--ink);
}
.slider-val {
  font-size: 11px; color: var(--ink);
  font-variant-numeric: tabular-nums;
  min-width: 44px; text-align: right;
}

/* dropzone */
.dropzone {
  width: 100%;
  border: 1px dashed var(--hair);
  border-radius: 12px;
  padding: 20px 20px;
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  transition: border-color .2s ease, background-color .2s ease;
  background: transparent;
  cursor: pointer;
}
.dropzone.drag {
  border-color: var(--donut);
  background: color-mix(in srgb, var(--donut) 12%, transparent);
}
.dropzone .headline {
  font-size: 12px; color: var(--ink);
  letter-spacing: 0.05em;
}
.dropzone .sub {
  font-size: 10px; color: var(--muted);
  letter-spacing: 0.18em; text-transform: uppercase;
}
.dropzone input { display: none; }

/* demo tunes */
.demos {
  display: flex; align-items: center; flex-wrap: wrap;
  gap: 6px; width: 100%;
}
.demos-label {
  font-size: 10px; color: var(--muted);
  letter-spacing: 0.18em; text-transform: uppercase;
  margin-right: 2px;
}
.demo-btn {
  font-family: inherit;
  font-size: 11px; color: var(--ink);
  background: transparent;
  border: 1px solid var(--hair);
  border-radius: 999px;
  padding: 4px 10px;
  cursor: pointer;
  transition: border-color .15s ease, background-color .15s ease, color .15s ease;
}
.demo-btn:hover { border-color: var(--ink); }
.demo-btn[aria-pressed="true"] {
  background: var(--ink); color: var(--bg); border-color: var(--ink);
}

/* transport */
.transport {
  display: flex; align-items: center; gap: 14px; width: 100%;
}
.playbtn {
  width: 34px; height: 34px; border-radius: 50%;
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  padding: 0;
  transition: background-color .15s ease, color .15s ease;
}
.playbtn:hover { background: var(--ink); color: var(--bg); }
.playbtn svg { width: 12px; height: 12px; }
.trackname {
  flex: 1;
  font-size: 11px; color: var(--ink);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.trackname.empty { color: var(--muted); }
.time {
  font-size: 11px; color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.progress {
  width: 100%; height: 2px; background: var(--hair); border-radius: 2px;
  position: relative; cursor: pointer; margin-top: 6px;
}
.progress .bar {
  position: absolute; top: 0; left: 0; height: 100%;
  background: var(--donut); border-radius: 2px;
  transition: background-color .35s ease;
}

/* reactivity meters (tiny bars that show bass/mid/treble) */
.meters {
  display: flex; gap: 8px; align-items: flex-end;
  height: 18px;
}
.meter {
  width: 22px; background: var(--hair); border-radius: 1px;
  position: relative; height: 100%;
}
.meter .fill {
  position: absolute; bottom: 0; left: 0; right: 0;
  background: var(--donut);
  transition: background-color .35s ease;
}
.meter .tag {
  position: absolute; top: 100%; left: 0; right: 0;
  margin-top: 4px;
  font-size: 9px; color: var(--muted);
  text-align: center;
  letter-spacing: 0.15em; text-transform: uppercase;
}

footer {
  width: 100%; max-width: 1100px;
  display: flex; flex-wrap: wrap; align-items: center; gap: 12px 20px;
  justify-content: space-between;
  color: var(--muted); font-size: 11px;
  letter-spacing: 0.12em; text-transform: uppercase;
  margin-top: 32px;
}
footer a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--muted) 45%, transparent);
  transition: color .15s ease, border-color .15s ease;
}
footer a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* ---------- Tweaks panel ---------- */
#tweaks {
  position: fixed; right: 20px; bottom: 20px;
  width: 280px;
  background: #fff; border: 1px solid var(--hair);
  border-radius: 10px;
  padding: 14px 16px 16px;
  box-shadow: 0 10px 40px -10px rgba(0,0,0,0.15);
  display: none;
  z-index: 100;
}
#tweaks.on { display: block; }
#tweaks h3 {
  margin: 0 0 12px;
  font-size: 11px; font-weight: 700;
  letter-spacing: 0.18em; text-transform: uppercase;
}
#tweaks .tgroup {
  display: flex; flex-direction: column; gap: 6px;
  margin-bottom: 12px;
}
#tweaks .tgroup:last-child { margin-bottom: 0; }
#tweaks .tlabel {
  font-size: 10px; color: var(--muted);
  letter-spacing: 0.15em; text-transform: uppercase;
  display: flex; justify-content: space-between;
}
#tweaks .tlabel span:last-child {
  color: var(--ink); font-variant-numeric: tabular-nums;
}
#tweaks .tog {
  display: flex; gap: 6px; flex-wrap: wrap;
}
#tweaks .tog button {
  flex: 1;
  font: inherit; font-size: 10px;
  padding: 6px 8px;
  border: 1px solid var(--hair); background: #fff;
  border-radius: 6px; cursor: pointer;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--muted);
}
#tweaks .tog button[aria-pressed="true"] {
  border-color: var(--ink); color: var(--ink);
}

@media (max-width: 640px) {
  pre.donut { font-size: 10px; }
  header .meta { display: none; }
  #tweaks { left: 12px; right: 12px; width: auto; }
}