:root {
  --bg: #03040a;
  --panel: rgba(255,255,255,0.04);
  --text: #e8e8f0;
  --muted: #8a8aa0;
  --accent: #7f7fff;
  --aura: #9fdfff;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Hiragino Sans", "Noto Sans JP", system-ui, sans-serif;
  height: 100%;
  overflow-x: hidden;
}

#stage {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}
#stage canvas {
  display: block;
}

#ui {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 24px 16px 120px;
}

h1 {
  font-weight: 300;
  letter-spacing: 0.15em;
  font-size: 1.4rem;
  margin: 8px 0 2px;
  text-align: center;
}
.subtitle {
  color: var(--muted);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  margin-bottom: 24px;
}

.panel {
  background: var(--panel);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 16px;
  padding: 16px;
  width: 100%;
  max-width: 480px;
  margin-bottom: 16px;
  backdrop-filter: blur(8px);
}

.group-label {
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.freq-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.freq-btn {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
}
.freq-btn:hover { background: rgba(255,255,255,0.14); }
.freq-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.controls {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 2;
  background: linear-gradient(to top, rgba(0,0,0,0.9), transparent);
  padding: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.play-btn {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: none;
  background: var(--accent);
  color: white;
  font-size: 1.4rem;
  cursor: pointer;
}

.mode-toggle {
  display: flex;
  gap: 8px;
  font-size: 0.75rem;
  color: var(--muted);
}

.warning {
  font-size: 0.7rem;
  color: #ffcf6b;
  text-align: center;
  max-width: 320px;
}

label {
  font-size: 0.75rem;
  color: var(--muted);
}

input[type="range"] {
  width: 100%;
}

select, input[type="text"], input[type="email"], input[type="password"] {
  width: 100%;
  padding: 8px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.1);
  background: rgba(0,0,0,0.3);
  color: var(--text);
  margin-top: 4px;
}

button.secondary {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  color: var(--text);
  padding: 8px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.8rem;
}