/**
 * Button Component Styles - Air Tasman Login Page
 * Comprehensive button styling with accessibility and interaction states
 */

/* =====================
   BASE BUTTON STYLES
   ===================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  height: var(--button-height);
  padding: 0 var(--space-lg);
  border: 1px solid transparent;
  border-radius: var(--border-radius-md);
  font-family: var(--font-system);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-fast);
  transition-property: background-color, border-color, color, transform, box-shadow;
  user-select: none;
  position: relative;
  overflow: hidden;
  min-width: var(--touch-target-min);
  white-space: nowrap;
}

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

/* =====================
   PRIMARY BUTTON
   ===================== */

.btn--primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.btn--primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  background: linear-gradient(135deg, #0059B3 0%, #004080 100%);
}

.btn--primary:focus {
  box-shadow: var(--focus-ring), var(--shadow-md);
  transform: translateY(-1px);
}

.btn--primary:active {
  transform: translateY(0) scale(0.98);
  box-shadow: var(--shadow-sm);
}

/* =====================
   SECONDARY BUTTON
   ===================== */

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

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

.btn--secondary:focus {
  box-shadow: var(--focus-ring);
  border-color: var(--color-primary-dark);
}

.btn--secondary:active {
  transform: scale(0.98);
  background-color: var(--color-primary-light);
}

/* =====================
   TERTIARY BUTTON
   ===================== */

.btn--tertiary {
  background-color: transparent;
  color: var(--color-primary);
  border-color: transparent;
  padding: 0 var(--space-md);
}

.btn--tertiary:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
}

.btn--tertiary:focus {
  box-shadow: var(--focus-ring);
  background-color: var(--color-primary-light);
}

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

/* =====================
   BUTTON SIZES
   ===================== */

.btn--small {
  height: 36px;
  padding: 0 var(--space-md);
  font-size: var(--font-size-sm);
}

.btn--large {
  height: 56px;
  padding: 0 var(--space-xl);
  font-size: var(--font-size-lg);
}

.btn--full-width {
  width: 100%;
}

/* =====================
   BUTTON STATES
   ===================== */

/* Loading State */
.btn--loading {
  pointer-events: none;
  position: relative;
}

.btn__text {
  transition: opacity var(--transition-fast);
}

.btn__loading {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn--loading .btn__text {
  opacity: 0;
}

.btn--loading .btn__loading {
  opacity: 1;
}

/* Disabled State */
.btn:disabled,
.btn--disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
  transform: none !important;
  box-shadow: none !important;
}

.btn--primary:disabled {
  background: var(--color-gray-400);
  border-color: var(--color-gray-400);
}

.btn--secondary:disabled {
  color: var(--color-gray-400);
  border-color: var(--color-gray-300);
  background-color: var(--color-gray-50);
}

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

.btn--success:hover {
  background-color: #059669;
  border-color: #059669;
}

/* Error/Danger State */
.btn--error {
  background-color: var(--color-error);
  border-color: var(--color-error);
  color: var(--color-white);
}

.btn--error:hover {
  background-color: #DC2626;
  border-color: #DC2626;
}

/* =====================
   ICON BUTTONS
   ===================== */

.btn--icon-only {
  width: var(--button-height);
  padding: 0;
  border-radius: var(--border-radius-md);
}

.btn--icon-only.btn--small {
  width: 36px;
}

.btn--icon-only.btn--large {
  width: 56px;
}

/* =====================
   BUTTON GROUPS
   ===================== */

.btn-group {
  display: inline-flex;
  border-radius: var(--border-radius-md);
  overflow: hidden;
}

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

.btn-group .btn:first-child {
  border-top-left-radius: var(--border-radius-md);
  border-bottom-left-radius: var(--border-radius-md);
}

.btn-group .btn:last-child {
  border-top-right-radius: var(--border-radius-md);
  border-bottom-right-radius: var(--border-radius-md);
  border-right-width: 1px;
}

.btn-group .btn:focus {
  z-index: 1;
  position: relative;
}

/* =====================
   FLOATING ACTION BUTTON
   ===================== */

.btn--fab {
  width: 56px;
  height: 56px;
  border-radius: var(--border-radius-full);
  box-shadow: var(--shadow-lg);
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  z-index: var(--z-popover);
}

.btn--fab:hover {
  box-shadow: var(--shadow-xl);
  transform: scale(1.05);
}

/* =====================
   RESPONSIVE DESIGN
   ===================== */

@media (max-width: 767px) {
  .btn {
    height: var(--touch-target-min);
    min-width: var(--touch-target-min);
  }
  
  .btn--small {
    height: 40px;
    min-width: 40px;
  }
  
  .btn--large {
    height: 56px;
    min-width: 56px;
  }
  
  .btn--fab {
    bottom: var(--space-md);
    right: var(--space-md);
  }
}

/* =====================
   HIGH CONTRAST MODE
   ===================== */

@media (prefers-contrast: high) {
  .btn {
    border-width: 2px;
  }
  
  .btn--primary {
    background: var(--color-primary);
    border-color: var(--color-black);
  }
  
  .btn--secondary {
    border-color: var(--color-black);
    color: var(--color-black);
  }
}

/* =====================
   REDUCED MOTION
   ===================== */

@media (prefers-reduced-motion: reduce) {
  .btn {
    transition: background-color var(--transition-fast),
                border-color var(--transition-fast),
                color var(--transition-fast);
  }
  
  .btn:hover,
  .btn:focus,
  .btn:active {
    transform: none !important;
  }
}

/* =====================
   DARK MODE SUPPORT
   ===================== */

@media (prefers-color-scheme: dark) {
  .btn--secondary {
    background-color: var(--color-gray-800);
    color: var(--color-white);
    border-color: var(--color-gray-600);
  }
  
  .btn--secondary:hover {
    background-color: var(--color-gray-700);
    border-color: var(--color-gray-500);
  }
  
  .btn--tertiary {
    color: var(--color-white);
  }
  
  .btn--tertiary:hover {
    background-color: var(--color-gray-700);
  }
}

/* =====================
   ANIMATION ENHANCEMENTS
   ===================== */

.btn {
  position: relative;
  overflow: hidden;
}

/* Ripple effect on click */
.btn::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width var(--transition-fast), height var(--transition-fast);
}

.btn:active::after {
  width: 300px;
  height: 300px;
}

@media (prefers-reduced-motion: reduce) {
  .btn::after {
    display: none;
  }
}