/* ================================================================
   ImageTools - Component Styles
   Reusable UI components: buttons, forms, modals, toasts
   ================================================================ */

/* ----------------------------------------------------------------
   Buttons
   ---------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  line-height: 1;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

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

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

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

.btn-secondary {
  background-color: var(--color-bg);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  background-color: var(--color-bg-tertiary);
  border-color: var(--color-text-muted);
}

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

.btn-outline:hover {
  background-color: var(--color-primary-50);
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
  padding: var(--space-2) var(--space-4);
}

.btn-ghost:hover {
  background-color: var(--color-primary-50);
}

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

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

.btn-full {
  width: 100%;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ----------------------------------------------------------------
   Form Inputs
   ---------------------------------------------------------------- */
.form-group {
  margin-bottom: var(--space-4);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input::placeholder {
  color: var(--color-text-muted);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-input.error {
  border-color: var(--color-error);
}

.form-error {
  font-size: var(--text-sm);
  color: var(--color-error);
  margin-top: var(--space-1);
}

/* ----------------------------------------------------------------
   Password Input with Eye Toggle
   ---------------------------------------------------------------- */
.password-input-wrapper {
  position: relative;
}

.password-input-wrapper .form-input {
  padding-right: 44px;
}

.password-toggle {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.password-toggle:hover {
  color: var(--color-text-secondary);
}

/* ----------------------------------------------------------------
   Password Requirements
   ---------------------------------------------------------------- */
.password-requirements {
  margin-top: var(--space-2);
}

.password-req {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-1);
  transition: color var(--transition-fast);
}

.password-req::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  flex-shrink: 0;
}

.password-req.met {
  color: var(--color-success);
}

.password-req.unmet-highlight {
  color: var(--color-error);
  animation: shake 0.3s ease;
}

.password-valid {
  font-size: var(--text-sm);
  color: var(--color-success);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-1);
}

/* ----------------------------------------------------------------
   Modal
   ---------------------------------------------------------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  animation: fadeIn var(--transition-base) ease;
}

.modal {
  background: var(--color-bg-elevated);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  max-width: 440px;
  width: 100%;
  padding: var(--space-8);
  position: relative;
  animation: modalIn var(--transition-base) ease;
}

.modal-close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  background: none;
  border: none;
  color: var(--color-text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  padding: var(--space-1);
  line-height: 1;
}

.modal-close:hover {
  color: var(--color-text);
}

.modal-title {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.modal-subtitle {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.95) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

/* ----------------------------------------------------------------
   Tabs
   ---------------------------------------------------------------- */
.tab-bar {
  display: flex;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-6);
}

.tab-btn {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-muted);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  color: var(--color-text-secondary);
}

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

/* ----------------------------------------------------------------
   Divider
   ---------------------------------------------------------------- */
.divider {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin: var(--space-6) 0;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.divider::before,
.divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

/* ----------------------------------------------------------------
   Google OAuth Button
   ---------------------------------------------------------------- */
.btn-google {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-weight: var(--font-medium);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-google:hover {
  background: var(--color-bg-tertiary);
  border-color: var(--color-text-muted);
}

/* ----------------------------------------------------------------
   Toast Notifications
   ---------------------------------------------------------------- */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 2000;
}

.toast {
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-lg);
  font-weight: var(--font-semibold);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-lg);
  animation: slideInRight 0.3s ease-out;
  margin-bottom: var(--space-2);
}

.toast.success {
  background-color: var(--color-success);
}

.toast.error {
  background-color: var(--color-error);
}

.toast.hiding {
  animation: slideOutRight 0.3s ease-in forwards;
}

/* ----------------------------------------------------------------
   Spinner
   ---------------------------------------------------------------- */
.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.spinner-sm {
  width: 20px;
  height: 20px;
  border-width: 2px;
}

/* ----------------------------------------------------------------
   Badge
   ---------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  border-radius: var(--radius-full);
  line-height: 1.5;
}

.badge-primary {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.badge-success {
  background-color: var(--color-success-light);
  color: var(--color-success);
}

.badge-muted {
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-muted);
}

/* ----------------------------------------------------------------
   Cards
   ---------------------------------------------------------------- */
.card {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--space-6);
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* ----------------------------------------------------------------
   Responsive: Mobile Modal Full-Screen
   ---------------------------------------------------------------- */
@media (max-width: 639px) {
  .modal-overlay {
    padding: 0;
  }

  .modal {
    max-width: 100%;
    min-height: 100vh;
    border-radius: 0;
    padding: var(--space-6);
  }
}

/* ----------------------------------------------------------------
   Before/After Slider
   Reusable image comparison slider (homepage hero, blog, app results)
   ---------------------------------------------------------------- */
.before-after-slider {
  position: relative;
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
  cursor: default;
  aspect-ratio: 4 / 3;
  background: var(--color-bg-tertiary);
}

.slider-image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.slider-image--before {
  position: absolute;
  inset: 0;
}

.slider-after-bg {
  position: absolute;
  inset: 0;
  /* Checkerboard for transparency */
  background-image:
    linear-gradient(45deg, var(--checker-light) 25%, transparent 25%),
    linear-gradient(-45deg, var(--checker-light) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--checker-light) 75%),
    linear-gradient(-45deg, transparent 75%, var(--checker-light) 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
  background-color: var(--checker-dark);
}

.slider-image--after {
  position: relative;
  z-index: 1;
}

/* Labels */
.slider-label {
  position: absolute;
  top: var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--color-text-inverse);
  background: rgba(0, 0, 0, 0.5);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  z-index: 10;
  pointer-events: none;
}

.slider-label--before {
  left: var(--space-3);
}

.slider-label--after {
  right: var(--space-3);
}

/* Divider Line */
.slider-divider {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 2px;
  background: white;
  box-shadow: 0 0 4px rgba(0, 0, 0, 0.3);
  z-index: 20;
  transform: translateX(-50%);
}

/* Handle */
.slider-handle {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: white;
  border: 2px solid rgba(0, 0, 0, 0.1);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  cursor: grab;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  padding: 0;
  z-index: 21;
  transition: transform var(--transition-fast);
}

.slider-handle:hover {
  transform: translate(-50%, -50%) scale(1.1);
}

.slider-handle:active {
  cursor: grabbing;
}

.slider-handle svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}