@layer components {
  .btn {
    /* Layout */
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 12px 24px;
    min-height: 44px;

    /* Typography */
    font-family: var(--font-sans);
    font-size: var(--text-normal);
    font-weight: 700;
    line-height: 1.2;
    text-decoration: none;
    text-align: center;
    white-space: nowrap;

    /* Visual */
    border: 2px solid var(--color-border);
    border-radius: 0;
    background: var(--color-bg-white);
    color: var(--color-text);
    box-shadow: none;
    text-shadow: none;
    cursor: pointer;
    user-select: none;

    /* Transitions */
    transition: all 150ms cubic-bezier(0.4, 0.0, 0.2, 1);
  }

  /* Remove default button styles */
  .btn:focus {
    outline: none;
  }

  .btn:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
  }

  /* Hover state */
  .btn:hover {
    background: var(--color-bg-light);
    border-color: var(--color-border-hover);
    transform: translateY(-1px);
  }

  /* Active/pressed state */
  .btn:active {
    transform: translateY(1px);
    background: var(--color-bg-secondary);
  }

  /* Disabled state */
  .btn:disabled,
  .btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
  }

  /* Color Variants */

  /* Primary button */
  .btn.primary {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
  }

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

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

  /* Secondary button - uses grayscale with emphasis */
  .btn.secondary {
    background: var(--color-gray-600);
    border-color: var(--color-gray-700);
    color: white;
  }

  .btn.secondary:hover {
    background: var(--color-gray-700);
    border-color: var(--color-gray-800);
  }

  .btn.secondary:active {
    background: var(--color-gray-800);
    border-color: var(--color-gray-900);
  }

  /* Success button */
  .btn.success {
    background: var(--color-success-dark);
    border-color: var(--color-success-dark);
    color: white;
  }

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

  .btn.success:active {
    background: var(--color-success-dark-hover);
    border-color: var(--color-success-border);
  }

  /* Warning button */
  .btn.warning {
    background: #ffc107;
    border-color: #ff9800;
    color: #000;
  }

  .btn.warning:hover {
    background: #ff9800;
    border-color: #f57c00;
  }

  .btn.warning:active {
    background: #f57c00;
    border-color: #e65100;
  }

  /* Danger button */
  .btn.danger {
    background: var(--color-danger);
    border-color: var(--color-danger);
    color: white;
  }

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

  .btn.danger:active {
    background: #a02530;
    border-color: #8b1f29;
  }

  /* WhatsApp button */
  .btn.whatsapp {
    background: var(--color-whatsapp);
    border-color: var(--color-whatsapp-border);
    color: white;
  }

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

  .btn.whatsapp:active {
    background: var(--color-whatsapp-border);
    border-color: #188a46;
  }

  /* Outline variants - inverted colors */
  .btn.outline {
    background: transparent;
    color: var(--color-text);
  }

  .btn.outline.primary {
    background: transparent;
    border-color: var(--color-primary);
    color: var(--color-primary);
  }

  .btn.outline.primary:hover {
    background: rgba(var(--color-primary-rgb), 0.1);
    border-color: var(--color-primary-hover);
  }

  .btn.outline.primary:active {
    background: rgba(var(--color-primary-rgb), 0.2);
  }

  .btn.outline.secondary {
    background: transparent;
    border-color: var(--color-gray-600);
    color: var(--color-gray-600);
  }

  .btn.outline.secondary:hover {
    background: var(--color-gray-100);
    border-color: var(--color-gray-700);
  }

  .btn.outline.success {
    background: transparent;
    border-color: var(--color-success-dark);
    color: var(--color-success-dark);
  }

  .btn.outline.success:hover {
    background: var(--color-success);
    border-color: var(--color-success-dark-hover);
  }

  .btn.outline.danger {
    background: transparent;
    border-color: var(--color-danger);
    color: var(--color-danger);
  }

  .btn.outline.danger:hover {
    background: var(--color-danger-light);
    border-color: var(--color-danger-hover);
  }

  .btn.outline.whatsapp {
    background: transparent;
    border-color: var(--color-whatsapp);
    color: var(--color-whatsapp);
  }

  .btn.outline.whatsapp:hover {
    background: rgba(37, 211, 102, 0.1);
    border-color: var(--color-whatsapp-hover);
  }

  /* Text Alignment Variants */
  .btn.align-left {
    justify-content: flex-start;
    text-align: left;
  }

  .btn.align-center {
    justify-content: center;
    text-align: center;
  }

  .btn.align-right {
    justify-content: flex-end;
    text-align: right;
  }

  /* Size Variants */

  /* Fill width */
  .btn.fill-width {
    width: 100%;
  }

  /* Fill height */
  .btn.fill-height {
    height: 100%;
    min-height: unset;
  }

  /* Small button */
  .btn.small {
    padding: 8px 16px;
    font-size: var(--text-small);
    min-height: 36px;
  }

  /* Large button */
  .btn.large {
    padding: 16px 32px;
    font-size: var(--text-large);
    min-height: 52px;
  }

  /* Mobile optimizations */
  @media (max-width: 768px) {
    .btn {
      min-height: 48px;
      padding: 14px 24px;
    }

    .btn.small {
      min-height: 40px;
      padding: 10px 18px;
    }

    .btn.large {
      min-height: 56px;
      padding: 18px 36px;
      font-size: var(--text-x-large);
    }
  }

  /* Icon-only button */
  .btn.icon-only {
    padding: 12px;
    min-width: 44px;
  }

  /* Button group */
  .btn-group {
    display: flex;
    gap: 0;
  }

  .btn-group .btn {
    border-radius: 0;
  }

  .btn-group .btn:not(:last-child) {
    border-right: none;
  }

  .btn-group .btn:hover {
    position: relative;
    z-index: 1;
    border-right: 2px solid currentColor;
  }
}

@layer utilities {
  /* Attention-grabbing glow animation */
  .glow {
    animation: glow-pulse 2s ease-in-out infinite;
  }

  .glow-primary {
    animation: glow-pulse-primary 2s ease-in-out infinite;
  }

  .glow-success {
    animation: glow-pulse-success 2s ease-in-out infinite;
  }

  .glow-danger {
    animation: glow-pulse-danger 2s ease-in-out infinite;
  }

  .glow-warning {
    animation: glow-pulse-warning 2s ease-in-out infinite;
  }

  @keyframes glow-pulse {
    0%, 100% {
      border-color: var(--color-border);
      box-shadow: 0 0 0 0 rgba(var(--color-gray-500), 0);
    }
    50% {
      border-color: var(--color-border-hover);
      box-shadow: 0 0 0 4px rgba(var(--color-gray-500), 0.3);
    }
  }

  @keyframes glow-pulse-primary {
    0%, 100% {
      border-color: var(--color-primary);
      box-shadow: 0 0 0 0 rgba(var(--color-primary-rgb), 0);
    }
    50% {
      border-color: var(--color-primary-hover);
      box-shadow: 0 0 0 6px rgba(var(--color-primary-rgb), 0.4);
    }
  }

  @keyframes glow-pulse-success {
    0%, 100% {
      border-color: var(--color-success-dark);
      box-shadow: 0 0 0 0 rgba(40, 167, 69, 0);
    }
    50% {
      border-color: var(--color-success-dark-hover);
      box-shadow: 0 0 0 6px rgba(40, 167, 69, 0.4);
    }
  }

  @keyframes glow-pulse-danger {
    0%, 100% {
      border-color: var(--color-danger);
      box-shadow: 0 0 0 0 rgba(220, 53, 69, 0);
    }
    50% {
      border-color: var(--color-danger-hover);
      box-shadow: 0 0 0 6px rgba(220, 53, 69, 0.4);
    }
  }

  @keyframes glow-pulse-warning {
    0%, 100% {
      border-color: #ffc107;
      box-shadow: 0 0 0 0 rgba(255, 193, 7, 0);
    }
    50% {
      border-color: #ff9800;
      box-shadow: 0 0 0 6px rgba(255, 193, 7, 0.4);
    }
  }

  /* Respect reduced motion preference */
  @media (prefers-reduced-motion: reduce) {
    .glow,
    .glow-primary,
    .glow-success,
    .glow-danger,
    .glow-warning {
      animation: none;
      border-color: var(--color-primary);
    }
  }
}

/* Dark mode adjustments */
[data-theme="dark"] {
  /* Secondary button needs adjustment for dark mode - ensure good contrast */
  .btn.secondary {
    background: #495057;
    border-color: #383d41;
    color: #f8f9fa;
  }

  .btn.secondary:hover {
    background: #383d41;
    border-color: #2c3034;
  }

  .btn.secondary:active {
    background: #2c3034;
    border-color: #1a1d20;
  }

  /* Warning button needs adjustment for dark mode */
  .btn.warning {
    background: #ff9800;
    border-color: #f57c00;
    color: #000;
  }

  .btn.warning:hover {
    background: #f57c00;
    border-color: #e65100;
  }

  .btn.warning:active {
    background: #e65100;
    border-color: #d84315;
  }
}