@import url('https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&family=Syne:wght@400;600;800&display=swap');

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0a0a0f;
  --surface: #12121a;
  --surface2: #1a1a26;
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.18);
  --text: #e8e8f0;
  --text-muted: #7a7a9a;
  --accent: #5dcaa5;
  --accent2: #534ab7;
  --radius: 12px;
  --radius-sm: 8px;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Syne', sans-serif;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
}

.container {
  width: 100%;
  max-width: 860px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.header {
  text-align: center;
}

.header h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #5dcaa5 0%, #534ab7 50%, #d4537e 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
  margin-bottom: 6px;
}

.header .subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-family: 'Space Mono', monospace;
  letter-spacing: 0.02em;
}

.canvas-wrapper {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  background: #050508;
}

#waveCanvas {
  display: block;
  width: 100%;
  height: 420px;
  cursor: crosshair;
}

.overlay-label {
  position: absolute;
  top: 12px;
  right: 14px;
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  color: rgba(255,255,255,0.25);
  pointer-events: none;
  letter-spacing: 0.05em;
}

.controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
}

.control-group {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color 0.2s;
}

.control-group:hover {
  border-color: var(--border-hover);
}

.control-group label {
  font-size: 11px;
  font-family: 'Space Mono', monospace;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.slider-row input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 3px;
  background: var(--surface2);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.slider-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
}

.slider-row input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.25);
  box-shadow: 0 0 0 4px rgba(93, 202, 165, 0.2);
}

.slider-row input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
}

.slider-row span {
  font-family: 'Space Mono', monospace;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  min-width: 28px;
  text-align: right;
}

.theme-group,
.actions-group {
  grid-column: span 2;
}

.theme-buttons,
.action-buttons {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.theme-btn {
  padding: 6px 14px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text-muted);
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: all 0.2s;
}

.theme-btn:hover {
  border-color: var(--border-hover);
  color: var(--text);
}

.theme-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #0a0a0f;
  font-weight: 700;
}

.action-btn {
  padding: 6px 18px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text);
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: all 0.2s;
}

.action-btn:hover {
  border-color: var(--border-hover);
  background: var(--surface);
}

.action-btn#pauseBtn.paused {
  background: var(--accent2);
  border-color: var(--accent2);
  color: #fff;
}

@media (max-width: 600px) {
  .theme-group,
  .actions-group {
    grid-column: span 1;
  }

  #waveCanvas {
    height: 280px;
  }
}