:root {
  --bg: #1a1a2e;
  --text: #eee;
  --text-secondary: #ccc;
  --text-muted: #888;
  --accent: #e94560;
  --accent-hover: #d63b54;
  --surface: #16213e;
  --surface-hover: #1a2a50;
  --border: #333;
  --border-hover: #555;
  --text-dim: #666;
  --text-placeholder: #aaa;
  --card-bg: #fff;
  --card-text: #000;
  --card-shadow: rgba(0, 0, 0, 0.3);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2rem 1rem;
}

h1 {
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 1.8rem;
  letter-spacing: 0.02em;
}

.btn {
  padding: 0.55rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  background: var(--surface);
  color: var(--text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  text-align: center;
  transition: all 0.15s;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

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

.btn.active,
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--card-bg);
  font-weight: 600;
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.switch-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.switch-item span {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.switch-track {
  width: 2rem;
  height: 1.125rem;
  border-radius: 0.5625rem;
  background: var(--border);
  position: relative;
  transition: background 0.2s;
  flex-shrink: 0;
}

.switch-track::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 0.125rem;
  transform: translateY(-50%);
  width: 0.875rem;
  height: 0.875rem;
  border-radius: 50%;
  background: var(--text-muted);
  transition: transform 0.2s, background 0.2s;
}

.switch-item.active .switch-track {
  background: var(--accent);
}

.switch-item.active .switch-track::after {
  transform: translateY(-50%) translateX(0.875rem);
  background: var(--card-bg);
}