:root {
  --primary: #3498db;
  --primary-dark: #2980b9;
  --secondary: #27ae60;
  --secondary-dark: #219653;
  --danger: #e74c3c;
  --danger-dark: #c0392b;
  --warning: #f39c12;
  --warning-dark: #e67e22;
  --bg: #f0f4f8;
  --text: #2c3e50;
  --muted: #7f8c8d;
}

body {
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, #f0f4f8 0%, #e6ecf1 100%);
  color: var(--text);
  margin: 0;
  padding: 0;
  padding-bottom: 60px;
}

.header {
  background: white;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  padding: 0.75rem;
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(calc(-50% - 10px));
  width: auto;
  max-width: calc(100% - 40px);
  z-index: 999;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.controls {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
}

.btn {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
  white-space: nowrap;
}

@media (max-width: 450px) {
  .header {
    padding: 0.5rem;
    gap: 0.3rem;
  }

  .btn {
    padding: 0.4rem 0.8rem;
  }
}