/**
 * Button Components - Haverford IFL
 * Unified button styles across the application
 * Requires: design-tokens.css
 */

/* ========== Base Button ========== */
.btn {
  display: inline-block;
  padding: var(--space-2) var(--space-5);
  font-family: var(--font-primary);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  line-height: var(--leading-normal);
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  vertical-align: middle;
  cursor: pointer;
  user-select: none;
  border: none;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-base),
              transform var(--transition-base),
              box-shadow var(--transition-base);
  box-shadow: var(--shadow-sm);
}

.btn:disabled,
.btn.disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

.btn:active:not(:disabled) {
  transform: translateY(2px);
}

/* ========== Button Variants ========== */

/* Primary - Maroon */
.btn-primary {
  background: linear-gradient(135deg, var(--color-maroon) 0%, var(--color-maroon-hover) 100%);
  color: var(--color-white);
  box-shadow: var(--shadow-maroon-sm);
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--color-maroon-hover) 0%, var(--color-maroon-light) 100%);
  box-shadow: var(--shadow-maroon-md);
  transform: translateY(-2px);
}

.btn-primary:active:not(:disabled) {
  box-shadow: var(--shadow-maroon-sm);
}

/* Secondary - Gray */
.btn-secondary {
  background: linear-gradient(135deg, var(--color-gray-700) 0%, var(--color-gray-800) 100%);
  color: var(--color-white);
}

.btn-secondary:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--color-gray-800) 0%, var(--color-gray-900) 100%);
  transform: translateY(-2px);
}

/* Success - Green */
.btn-success {
  background: linear-gradient(135deg, var(--color-success) 0%, var(--color-success-light) 100%);
  color: var(--color-white);
}

.btn-success:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--color-success-light) 0%, var(--color-success) 100%);
  transform: translateY(-2px);
}

/* Warning - Yellow */
.btn-warning {
  background: linear-gradient(135deg, var(--color-warning) 0%, #e0a800 100%);
  color: var(--color-gray-900);
}

.btn-warning:hover:not(:disabled) {
  background: linear-gradient(135deg, #e0a800 0%, #d39e00 100%);
  transform: translateY(-2px);
}

/* Danger - Red */
.btn-danger {
  background: linear-gradient(135deg, var(--color-error) 0%, #c82333 100%);
  color: var(--color-white);
}

.btn-danger:hover:not(:disabled) {
  background: linear-gradient(135deg, #c82333 0%, #bd2130 100%);
  transform: translateY(-2px);
}

/* Outline variant */
.btn-outline {
  background: transparent;
  border: 2px solid var(--color-maroon);
  color: var(--color-maroon);
  box-shadow: none;
}

.btn-outline:hover:not(:disabled) {
  background: var(--color-maroon);
  color: var(--color-white);
  transform: translateY(-2px);
}

/* Outline variants */
.btn-outline-primary {
  background: transparent;
  border: 2px solid var(--color-maroon);
  color: var(--color-maroon);
  box-shadow: none;
}

.btn-outline-primary:hover:not(:disabled) {
  background: var(--color-maroon);
  color: var(--color-white);
  transform: translateY(-2px);
}

.btn-outline-secondary {
  background: transparent;
  border: 2px solid var(--color-gray-600);
  color: var(--color-gray-700);
  box-shadow: none;
}

.btn-outline-secondary:hover:not(:disabled) {
  background: var(--color-gray-700);
  color: var(--color-white);
  transform: translateY(-2px);
}

.btn-outline-success {
  background: transparent;
  border: 2px solid #28a745;
  color: #28a745;
  box-shadow: none;
}

.btn-outline-success:hover:not(:disabled) {
  background: #28a745;
  color: var(--color-white);
  transform: translateY(-2px);
}

.btn-outline-danger {
  background: transparent;
  border: 2px solid var(--color-error);
  color: var(--color-error);
  box-shadow: none;
}

.btn-outline-danger:hover:not(:disabled) {
  background: var(--color-error);
  color: var(--color-white);
  transform: translateY(-2px);
}

/* Ghost variant */
.btn-ghost {
  background: transparent;
  box-shadow: none;
  color: var(--color-maroon);
}

.btn-ghost:hover:not(:disabled) {
  background: rgba(103, 0, 0, 0.1);
  transform: translateY(-2px);
}

/* ========== Button Sizes ========== */

.btn-xs {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  border-radius: var(--radius-sm);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
  border-radius: var(--radius-lg);
}

.btn-xl {
  padding: var(--space-5) var(--space-10);
  font-size: var(--text-xl);
  border-radius: var(--radius-xl);
}

/* ========== Button Widths ========== */

.btn-block {
  display: block;
  width: 100%;
}

.btn-auto {
  width: auto;
}

/* ========== Button Groups ========== */

.btn-group {
  display: flex;
  gap: var(--space-3);
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-group-vertical {
  flex-direction: column;
}

.btn-group-start {
  justify-content: flex-start;
}

.btn-group-end {
  justify-content: flex-end;
}

/* ========== Loading State ========== */

.btn-loading {
  position: relative;
  color: transparent;
  pointer-events: none;
}

.btn-loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 16px;
  height: 16px;
  margin: -8px 0 0 -8px;
  border: 2px solid transparent;
  border-top-color: currentColor;
  border-radius: var(--radius-circle);
  animation: btn-spin 0.6s linear infinite;
}

@keyframes btn-spin {
  to {
    transform: rotate(360deg);
  }
}

/* ========== Icon Buttons ========== */

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-circle);
}

.btn-icon.btn-sm {
  width: 32px;
  height: 32px;
}

.btn-icon.btn-lg {
  width: 48px;
  height: 48px;
}

.btn-icon.btn-xl {
  width: 56px;
  height: 56px;
}

/* Button with icon and text */
.btn-with-icon {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

/* ========== Floating Action Button ========== */

.btn-fab {
  position: fixed;
  bottom: var(--space-5);
  right: var(--space-5);
  width: 56px;
  height: 56px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-circle);
  background: linear-gradient(135deg, var(--color-maroon) 0%, var(--color-maroon-hover) 100%);
  color: var(--color-white);
  box-shadow: var(--shadow-maroon-lg);
  z-index: var(--z-fixed);
  font-size: var(--text-2xl);
}

.btn-fab:hover:not(:disabled) {
  transform: scale(1.1);
  box-shadow: var(--shadow-maroon-xl);
}

/* ========== Responsive ========== */

@media (max-width: 768px) {
  .btn {
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
  }

  .btn-lg {
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-base);
  }

  .btn-group {
    flex-direction: column;
    width: 100%;
  }

  .btn-group > .btn {
    width: 100%;
  }

  .btn-fab {
    bottom: var(--space-4);
    right: var(--space-4);
  }
}

/* ========== Accessibility ========== */

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

/* High contrast mode */
@media (prefers-contrast: high) {
  .btn {
    border: 2px solid currentColor;
  }
}

/* ========== Legacy Support ========== */
/* Maintain compatibility with existing button classes */

/* Auth page buttons */
.login-container form button {
  composes: btn btn-primary btn-block;
}

/* Message form buttons */
.form-submit-btn {
  composes: btn btn-primary;
}

/* Dropdown button in table.css */
.dropdown:checked + label,
.dropdown:not(:checked) + label {
  composes: btn btn-primary;
}