:root {
  color-scheme: dark;
  --bg-0: #04101b;
  --bg-1: #081726;
  --panel: rgba(8, 22, 36, 0.86);
  --panel-border: rgba(125, 197, 255, 0.18);
  --text: #eaf4ff;
  --muted: #a9c8e2;
  --accent: #4aa8ff;
  --accent-soft: rgba(74, 168, 255, 0.16);
  --good: #39c07f;
  --stop: #ff6b57;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.42);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(41, 116, 190, 0.26), transparent 34%),
    radial-gradient(circle at bottom right, rgba(24, 168, 190, 0.18), transparent 30%),
    linear-gradient(160deg, var(--bg-0), var(--bg-1));
  display: grid;
  place-items: center;
  padding: 24px;
}

.app {
  width: min(1040px, 100%);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 22px;
  box-shadow: var(--shadow);
  padding: 26px;
  backdrop-filter: blur(14px);
}

header h1 {
  margin: 0 0 8px;
  font-size: clamp(1.55rem, 3vw, 2.35rem);
  letter-spacing: 0.02em;
}

header p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
  max-width: 78ch;
}

.transport {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 22px 0 14px;
}

button {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--text);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.09), rgba(255, 255, 255, 0.04));
  border-radius: 12px;
  padding: 11px 16px;
  font: inherit;
  font-weight: 650;
  cursor: pointer;
  transition:
    transform 120ms ease,
    background 120ms ease,
    border-color 120ms ease;
}

button:hover {
  transform: translateY(-1px);
  border-color: rgba(255, 255, 255, 0.22);
}

button:active {
  transform: translateY(0);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
  transform: none;
}

#start-stop {
  min-width: 116px;
  background: linear-gradient(180deg, #2378e8, #1857ad);
  border-color: rgba(142, 201, 255, 0.42);
}

#start-stop.playing {
  background: linear-gradient(180deg, #d85b49, #a53425);
  border-color: rgba(255, 171, 160, 0.45);
}

#randomize {
  background: linear-gradient(180deg, rgba(57, 192, 127, 0.24), rgba(57, 192, 127, 0.1));
  border-color: rgba(122, 226, 179, 0.35);
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.04);
  color: var(--muted);
  user-select: none;
}

.toggle input {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
}

.status-group {
  margin-left: auto;
  display: grid;
  gap: 6px;
  justify-items: end;
}

.preset-name {
  color: var(--muted);
  font-size: 0.9rem;
}

.status {
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.05);
  color: var(--muted);
  font-size: 0.92rem;
}

.presets {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 16px;
}

.presets button {
  padding: 8px 12px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.9rem;
  background: rgba(255, 255, 255, 0.05);
}

.presets button.active {
  background: var(--accent-soft);
  border-color: rgba(122, 196, 255, 0.55);
  color: #dff0ff;
}

canvas {
  width: 100%;
  height: 220px;
  display: block;
  border-radius: 18px;
  border: 1px solid rgba(140, 205, 255, 0.16);
  background: linear-gradient(180deg, #071523, #0d2c44);
  margin-bottom: 18px;
}

.controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(235px, 1fr));
  gap: 15px 18px;
}

.control {
  padding: 12px 13px;
  border-radius: 15px;
  background: rgba(255, 255, 255, 0.035);
  border: 1px solid rgba(255, 255, 255, 0.07);
}

.control label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 8px;
  font-size: 0.92rem;
  color: #d8ebfb;
}

.control output {
  color: #93ccff;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

input[type="range"] {
  width: 100%;
  margin: 0;
  accent-color: var(--accent);
  cursor: pointer;
}

select {
  width: 100%;
  padding: 9px 10px;
  border-radius: 10px;
  background: #0c2135;
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.12);
  font: inherit;
}

footer {
  margin-top: 20px;
  color: #84a8c6;
  font-size: 0.87rem;
  line-height: 1.5;
}

.noscript {
  margin-top: 16px;
  padding: 12px;
  border-radius: 12px;
  background: rgba(255, 107, 87, 0.12);
  border: 1px solid rgba(255, 107, 87, 0.35);
  color: #ffd7d0;
}

:focus-visible {
  outline: 3px solid #8fc7ff;
  outline-offset: 2px;
  border-radius: 6px;
}

@media (max-width: 640px) {
  body {
    padding: 12px;
  }

  .app {
    padding: 18px;
    border-radius: 18px;
  }

  .status-group {
    margin-left: 0;
    width: 100%;
    justify-items: start;
  }
}