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

:root {
  --bg: #1a1a2e;
  --bg-surface: #16213e;
  --bg-elevated: #0f3460;
  --text: #e0e0e0;
  --text-muted: #8892a4;
  --accent: #e94560;
  --accent-glow: rgba(233, 69, 96, 0.3);
  --premium: #f0a500;
  --premium-glow: rgba(240, 165, 0, 0.2);
  --slider-track: #2a2a4a;
  --slider-thumb: #e94560;
  --radius: 12px;
  --font: -apple-system, 'Hiragino Sans', 'Noto Sans JP', 'Segoe UI', sans-serif;
}

html {
  height: 100%;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100%;
  display: flex;
  justify-content: center;
  -webkit-font-smoothing: antialiased;
}

.app {
  width: 100%;
  max-width: 480px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 0 20px;
}

.header {
  padding: 24px 0 8px;
  text-align: center;
}

.logo {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
  padding: 24px 0;
}

.play-btn {
  width: 88px;
  height: 88px;
  border-radius: 50%;
  border: 3px solid var(--accent);
  background: transparent;
  color: var(--accent);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: box-shadow 0.2s, transform 0.1s;
  -webkit-tap-highlight-color: transparent;
}

.play-btn:hover {
  box-shadow: 0 0 24px var(--accent-glow);
}

.play-btn:active {
  transform: scale(0.95);
}

.play-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.play-btn.active {
  background: var(--accent);
  color: var(--bg);
}

.play-icon {
  width: 32px;
  height: 32px;
}

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

.control-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.control-label {
  flex: 0 0 120px;
  font-size: 0.875rem;
  color: var(--text);
  white-space: nowrap;
}

.slider {
  flex: 1;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--slider-track);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--slider-thumb);
  border: none;
  cursor: pointer;
  box-shadow: 0 0 8px var(--accent-glow);
}

.slider::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--slider-thumb);
  border: none;
  cursor: pointer;
  box-shadow: 0 0 8px var(--accent-glow);
}

.slider:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.control-value {
  flex: 0 0 32px;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.locked {
  opacity: 0.45;
  pointer-events: none;
}

.locked .slider {
  cursor: not-allowed;
}

.lock-icon {
  font-size: 0.75rem;
  margin-right: 4px;
}

.premium-badge {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--premium);
  background: var(--premium-glow);
  padding: 2px 6px;
  border-radius: 4px;
  letter-spacing: 0.08em;
}

.premium-features {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.feature-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--bg-surface);
  border-radius: var(--radius);
  font-size: 0.875rem;
}

.feature-row .premium-badge {
  margin-left: auto;
}

.upgrade-btn {
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--premium), #e6950a);
  color: #1a1a2e;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.1s;
  -webkit-tap-highlight-color: transparent;
}

.upgrade-btn:hover {
  opacity: 0.9;
}

.upgrade-btn:active {
  transform: scale(0.98);
}

.upgrade-btn:focus-visible {
  outline: 2px solid var(--premium);
  outline-offset: 4px;
}

.ad-container {
  width: 100%;
  min-height: 50px;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 8px 0 env(safe-area-inset-bottom, 8px);
  background: var(--bg-surface);
  border-radius: var(--radius) var(--radius) 0 0;
}

.unsupported {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
  text-align: center;
  padding: 24px;
  z-index: 100;
}

.hidden {
  display: none !important;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

@media (min-width: 768px) {
  .ad-container {
    min-height: 90px;
  }
}