/* ============================================
   RAGpy UI Components
   Professional SaaS Component Library
   ============================================ */

/* ----------------------------------------
   Buttons
   ---------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-family-base);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  line-height: 1.5;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--color-bg-primary),
              0 0 0 4px var(--color-brand-primary);
}

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

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

.btn-primary:hover {
  background-color: var(--color-brand-primary-hover);
  border-color: var(--color-brand-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

/* Secondary Button */
.btn-secondary {
  background-color: transparent;
  color: var(--color-text-primary);
  border-color: var(--color-border);
}

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

/* Ghost Button */
.btn-ghost {
  background-color: transparent;
  color: var(--color-text-secondary);
  border-color: transparent;
}

.btn-ghost:hover {
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-primary);
}

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

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

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

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

/* Button Sizes */
.btn-xs {
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  border-radius: var(--radius-sm);
}

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

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

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

/* Icon Button */
.btn-icon {
  padding: var(--space-2);
  min-width: 36px;
  min-height: 36px;
}

.btn-icon.btn-sm {
  padding: var(--space-1);
  min-width: 28px;
  min-height: 28px;
}

.btn-icon.btn-lg {
  padding: var(--space-3);
  min-width: 44px;
  min-height: 44px;
}

/* Button with Icon */
.btn svg,
.btn i {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

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

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

.btn-group .btn:first-child {
  border-radius: var(--radius-md) 0 0 var(--radius-md);
}

.btn-group .btn:last-child {
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.btn-group .btn:not(:first-child) {
  margin-left: -1px;
}

/* ----------------------------------------
   Cards
   ---------------------------------------- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
}

.card-elevated {
  border: none;
  box-shadow: var(--shadow-sm);
}

.card-elevated:hover {
  box-shadow: var(--shadow-md);
}

.card-interactive {
  cursor: pointer;
}

.card-interactive:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-brand-primary);
}

.card-header {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-tertiary);
}

.card-header h3,
.card-header h4 {
  margin: 0;
}

.card-body {
  padding: var(--space-5);
}

.card-footer {
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-tertiary);
}

/* Card Variants */
.card-compact .card-body {
  padding: var(--space-4);
}

.card-flush .card-body {
  padding: 0;
}

/* Stat Card */
.stat-card {
  padding: var(--space-5);
}

.stat-card-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  background: var(--color-brand-primary-light);
  color: var(--color-brand-primary);
  margin-bottom: var(--space-4);
}

.stat-card-value {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--color-text-primary);
  line-height: 1.2;
}

.stat-card-label {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-1);
}

.stat-card-trend {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  margin-top: var(--space-2);
}

.stat-card-trend.positive {
  color: var(--color-success);
}

.stat-card-trend.negative {
  color: var(--color-error);
}

/* ----------------------------------------
   Forms
   ---------------------------------------- */
.form-group {
  margin-bottom: var(--space-5);
}

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

.form-label-optional {
  font-weight: var(--font-normal);
  color: var(--color-text-tertiary);
}

.form-input,
.form-select,
.form-textarea {
  display: block;
  width: 100%;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-family-base);
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.form-input:hover,
.form-select:hover,
.form-textarea:hover {
  border-color: var(--color-text-tertiary);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-brand-primary);
  box-shadow: 0 0 0 3px var(--color-brand-primary-light);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-tertiary);
}

.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled {
  background-color: var(--color-bg-tertiary);
  cursor: not-allowed;
  opacity: 0.6;
}

/* Input Sizes */
.form-input-sm {
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
}

.form-input-lg {
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
}

/* Select */
.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
  background-position: right var(--space-3) center;
  background-repeat: no-repeat;
  background-size: 16px;
  padding-right: var(--space-10);
}

/* Textarea */
.form-textarea {
  min-height: 100px;
  resize: vertical;
}

/* Input with Icon */
.input-group {
  position: relative;
}

.input-group .input-icon {
  position: absolute;
  left: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-tertiary);
  pointer-events: none;
}

.input-group .input-icon svg,
.input-group .input-icon i {
  width: 16px;
  height: 16px;
}

.input-group .form-input {
  padding-left: var(--space-10);
}

.input-group-right .input-icon {
  left: auto;
  right: var(--space-3);
}

.input-group-right .form-input {
  padding-left: var(--space-3);
  padding-right: var(--space-10);
}

/* Checkbox & Radio */
.form-check {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
}

.form-check-input {
  width: 18px;
  height: 18px;
  margin: 0;
  flex-shrink: 0;
  cursor: pointer;
  accent-color: var(--color-brand-primary);
}

.form-check-label {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
}

/* Form Validation */
.form-input.is-invalid,
.form-select.is-invalid,
.form-textarea.is-invalid {
  border-color: var(--color-error);
}

.form-input.is-invalid:focus,
.form-select.is-invalid:focus,
.form-textarea.is-invalid:focus {
  box-shadow: 0 0 0 3px var(--color-error-light);
}

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

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

/* ----------------------------------------
   Tables
   ---------------------------------------- */
.table-container {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.table th {
  padding: var(--space-3) var(--space-4);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  text-align: left;
  background: var(--color-bg-tertiary);
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.table td {
  padding: var(--space-3) var(--space-4);
  color: var(--color-text-primary);
  border-bottom: 1px solid var(--color-border-light);
}

.table tbody tr:last-child td {
  border-bottom: none;
}

.table tbody tr:hover {
  background: var(--color-bg-tertiary);
}

.table tbody tr.selected {
  background: var(--color-brand-primary-light);
}

/* Table Variants */
.table-compact th,
.table-compact td {
  padding: var(--space-2) var(--space-3);
}

.table-striped tbody tr:nth-child(odd) {
  background: var(--color-bg-tertiary);
}

.table-striped tbody tr:nth-child(odd):hover {
  background: var(--color-border-light);
}

/* Table Actions */
.table-actions {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

/* ----------------------------------------
   Badges & Tags
   ---------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  line-height: 1;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

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

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

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

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

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

/* Badge with dot */
.badge-dot {
  padding-left: var(--space-2);
}

.badge-dot::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

/* Tag (outlined badge) */
.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: var(--color-surface);
  color: var(--color-text-secondary);
}

.tag-removable {
  padding-right: var(--space-1);
}

.tag-remove {
  width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.tag-remove:hover {
  background: var(--color-error-light);
  color: var(--color-error);
}

/* ----------------------------------------
   Alerts
   ---------------------------------------- */
.alert {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
}

.alert-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}

.alert-content {
  flex: 1;
}

.alert-title {
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-1);
}

.alert-close {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  cursor: pointer;
  opacity: 0.6;
  transition: opacity var(--transition-fast);
}

.alert-close:hover {
  opacity: 1;
}

.alert-info {
  background: var(--color-info-light);
  color: var(--color-brand-primary);
  border: 1px solid rgba(59, 130, 246, 0.2);
}

.alert-success {
  background: var(--color-success-light);
  color: var(--color-success-dark);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.alert-warning {
  background: var(--color-warning-light);
  color: var(--color-warning-dark);
  border: 1px solid rgba(245, 158, 11, 0.2);
}

.alert-error {
  background: var(--color-error-light);
  color: var(--color-error-dark);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

/* ----------------------------------------
   Toast Notifications
   ---------------------------------------- */
.toast-container {
  position: fixed;
  top: var(--space-6);
  right: var(--space-6);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  max-width: 400px;
}

.toast {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  animation: slideInRight var(--transition-slow) ease-out;
}

.toast-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}

.toast-content {
  flex: 1;
  font-size: var(--text-sm);
}

.toast-title {
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
}

.toast-message {
  color: var(--color-text-secondary);
  margin-top: var(--space-1);
}

.toast-close {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  cursor: pointer;
  color: var(--color-text-tertiary);
  transition: color var(--transition-fast);
}

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

.toast-success .toast-icon { color: var(--color-success); }
.toast-error .toast-icon { color: var(--color-error); }
.toast-warning .toast-icon { color: var(--color-warning); }
.toast-info .toast-icon { color: var(--color-brand-primary); }

/* Toast exit animation */
.toast.toast-exit {
  animation: slideOutRight var(--transition-base) ease-in forwards;
}

@keyframes slideOutRight {
  to {
    opacity: 0;
    transform: translateX(100%);
  }
}

/* ----------------------------------------
   Modal
   ---------------------------------------- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: var(--z-modal-backdrop);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.modal-backdrop.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.95);
  z-index: var(--z-modal);
  width: 100%;
  max-width: 500px;
  max-height: calc(100vh - var(--space-12));
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.modal.active {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, -50%) scale(1);
}

.modal-sm { max-width: 400px; }
.modal-lg { max-width: 700px; }
.modal-xl { max-width: 900px; }
.modal-full { max-width: calc(100vw - var(--space-8)); }

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.modal-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  margin: 0;
}

.modal-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--color-text-tertiary);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
}

.modal-body {
  padding: var(--space-6);
  overflow-y: auto;
  max-height: calc(100vh - 250px);
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-tertiary);
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
}

/* ----------------------------------------
   Progress
   ---------------------------------------- */
.progress {
  height: 8px;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--color-brand-primary);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

.progress-bar.animated {
  background: linear-gradient(
    90deg,
    var(--color-brand-primary) 0%,
    var(--color-brand-primary-hover) 50%,
    var(--color-brand-primary) 100%
  );
  background-size: 200% 100%;
  animation: shimmer 2s infinite linear;
}

.progress-success .progress-bar { background: var(--color-success); }
.progress-warning .progress-bar { background: var(--color-warning); }
.progress-error .progress-bar { background: var(--color-error); }

/* Progress with label */
.progress-labeled {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.progress-labeled .progress {
  flex: 1;
}

.progress-label {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  min-width: 40px;
  text-align: right;
}

/* Steps Progress */
.steps {
  display: flex;
  align-items: center;
}

.step {
  display: flex;
  align-items: center;
  flex: 1;
}

.step:last-child {
  flex: 0;
}

.step-indicator {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  background: var(--color-bg-tertiary);
  color: var(--color-text-tertiary);
  border: 2px solid var(--color-border);
  flex-shrink: 0;
  transition: all var(--transition-base);
}

.step-line {
  flex: 1;
  height: 2px;
  background: var(--color-border);
  margin: 0 var(--space-2);
}

.step.active .step-indicator {
  background: var(--color-brand-primary-light);
  color: var(--color-brand-primary);
  border-color: var(--color-brand-primary);
}

.step.completed .step-indicator {
  background: var(--color-brand-primary);
  color: white;
  border-color: var(--color-brand-primary);
}

.step.completed .step-line {
  background: var(--color-brand-primary);
}

.step-label {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  white-space: nowrap;
}

.step.active .step-label,
.step.completed .step-label {
  color: var(--color-text-primary);
}

/* ----------------------------------------
   Avatar
   ---------------------------------------- */
.avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
  background: var(--color-brand-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.avatar-initials {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-brand-primary);
  text-transform: uppercase;
}

.avatar-xs { width: 24px; height: 24px; font-size: var(--text-xs); }
.avatar-sm { width: 32px; height: 32px; }
.avatar-lg { width: 48px; height: 48px; font-size: var(--text-lg); }
.avatar-xl { width: 64px; height: 64px; font-size: var(--text-xl); }

.avatar-group {
  display: flex;
}

.avatar-group .avatar {
  border: 2px solid var(--color-surface);
  margin-left: -8px;
}

.avatar-group .avatar:first-child {
  margin-left: 0;
}

/* ----------------------------------------
   Dropdown
   ---------------------------------------- */
.dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  padding: var(--space-2);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-dropdown);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-fast);
}

.dropdown.active .dropdown-menu,
.dropdown-menu.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(var(--space-2));
}

.dropdown-menu-right {
  left: auto;
  right: 0;
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.dropdown-item:hover {
  background: var(--color-bg-tertiary);
}

.dropdown-item.active {
  background: var(--color-brand-primary-light);
  color: var(--color-brand-primary);
}

.dropdown-item.danger {
  color: var(--color-error);
}

.dropdown-item.danger:hover {
  background: var(--color-error-light);
}

.dropdown-divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-2) 0;
}

.dropdown-header {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
}

/* ----------------------------------------
   Tabs
   ---------------------------------------- */
.tabs {
  display: flex;
  border-bottom: 1px solid var(--color-border);
  gap: var(--space-1);
}

.tab {
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

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

.tab-content {
  padding: var(--space-5) 0;
}

.tab-panel {
  display: none;
  animation: fadeIn var(--transition-base);
}

.tab-panel.active {
  display: block;
}

/* Pills variant */
.tabs-pills {
  border-bottom: none;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-lg);
  padding: var(--space-1);
}

.tabs-pills .tab {
  border-bottom: none;
  border-radius: var(--radius-md);
  margin-bottom: 0;
}

.tabs-pills .tab.active {
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  color: var(--color-text-primary);
}

/* ----------------------------------------
   Empty State
   ---------------------------------------- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-12) var(--space-6);
  text-align: center;
}

.empty-state-icon {
  width: 64px;
  height: 64px;
  margin-bottom: var(--space-4);
  color: var(--color-text-tertiary);
}

.empty-state-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.empty-state-description {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  max-width: 300px;
  margin-bottom: var(--space-6);
}

/* ----------------------------------------
   Divider
   ---------------------------------------- */
.divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-6) 0;
}

.divider-vertical {
  width: 1px;
  height: auto;
  align-self: stretch;
  margin: 0 var(--space-4);
}

.divider-text {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  color: var(--color-text-tertiary);
  font-size: var(--text-sm);
}

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

/* ----------------------------------------
   Tooltip
   ---------------------------------------- */
.tooltip {
  position: relative;
}

.tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-4px);
  padding: var(--space-2) var(--space-3);
  background: var(--color-text-primary);
  color: var(--color-bg-primary);
  font-size: var(--text-xs);
  border-radius: var(--radius-md);
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
  z-index: var(--z-tooltip);
  pointer-events: none;
}

.tooltip:hover::after {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(-8px);
}

/* ----------------------------------------
   Loading States
   ---------------------------------------- */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-brand-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.spinner-sm { width: 14px; height: 14px; border-width: 1.5px; }
.spinner-lg { width: 28px; height: 28px; border-width: 3px; }

.loading-dots {
  display: flex;
  gap: var(--space-1);
}

.loading-dots span {
  width: 6px;
  height: 6px;
  background: var(--color-brand-primary);
  border-radius: 50%;
  animation: pulse 1.4s ease-in-out infinite;
}

.loading-dots span:nth-child(2) { animation-delay: 0.2s; }
.loading-dots span:nth-child(3) { animation-delay: 0.4s; }

/* Skeleton variations */
.skeleton-line {
  height: 12px;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-2);
}

.skeleton-line:last-child {
  width: 70%;
  margin-bottom: 0;
}

.skeleton-block {
  border-radius: var(--radius-md);
}

/* ----------------------------------------
   File Upload
   ---------------------------------------- */
.file-upload {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-base);
}

.file-upload:hover {
  border-color: var(--color-brand-primary);
  background: var(--color-brand-primary-light);
}

.file-upload.dragover {
  border-color: var(--color-brand-primary);
  background: var(--color-brand-primary-light);
}

.file-upload-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-4);
  color: var(--color-text-tertiary);
}

.file-upload:hover .file-upload-icon {
  color: var(--color-brand-primary);
}

.file-upload-text {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.file-upload-text strong {
  color: var(--color-brand-primary);
}

.file-upload-hint {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  margin-top: var(--space-2);
}

.file-upload input[type="file"] {
  display: none;
}

/* File Item */
.file-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-md);
}

.file-item-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  color: var(--color-text-tertiary);
}

.file-item-info {
  flex: 1;
  min-width: 0;
}

.file-item-name {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-item-size {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

.file-item-remove {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--color-text-tertiary);
  transition: all var(--transition-fast);
}

.file-item-remove:hover {
  background: var(--color-error-light);
  color: var(--color-error);
}

/* ----------------------------------------
   Pagination
   ---------------------------------------- */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  margin-top: var(--space-6);
  padding: var(--space-4) 0;
}

.pagination-info {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-right: var(--space-4);
}

.pagination-controls {
  display: flex;
  gap: var(--space-2);
}

.pagination-btn {
  min-width: 36px;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-primary);
  text-align: center;
}

.pagination-btn:hover:not(:disabled) {
  background: var(--color-bg-tertiary);
  border-color: var(--color-brand-primary);
}

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

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

.pagination-ellipsis {
  padding: var(--space-2) var(--space-1);
  color: var(--color-text-tertiary);
}

/* ----------------------------------------
   Citation Import Components
   ---------------------------------------- */

/* Preview Stats */
.preview-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  text-align: center;
  transition: all var(--transition-fast);
}

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

.stat-value {
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  margin-bottom: var(--space-2);
  line-height: 1;
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  font-weight: var(--font-medium);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Stat variants */
.stat-success .stat-value {
  color: var(--color-success);
}

.stat-info .stat-value {
  color: var(--color-info, var(--color-brand-primary));
}

.stat-danger .stat-value {
  color: var(--color-error);
}

.stat-secondary .stat-value {
  color: var(--color-text-secondary);
}

/* Tabs */
.preview-tabs {
  display: flex;
  gap: var(--space-2);
  border-bottom: 2px solid var(--color-border);
  margin-bottom: var(--space-5);
}

.tab-btn {
  padding: var(--space-3) var(--space-5);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  font-size: var(--text-base);
  position: relative;
  margin-bottom: -2px;
}

.tab-btn:hover {
  color: var(--color-brand-primary);
  background: var(--color-bg-tertiary);
}

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

.tab-content {
  display: none;
  animation: fadeIn var(--transition-base);
}

.tab-content.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Citations List */
.citations-list {
  max-height: 500px;
  overflow-y: auto;
  padding-right: var(--space-2);
}

.citations-list::-webkit-scrollbar {
  width: 8px;
}

.citations-list::-webkit-scrollbar-track {
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
}

.citations-list::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}

.citations-list::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-tertiary);
}

/* Citation Cards */
.citation-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  margin-bottom: var(--space-3);
  background: var(--color-surface);
  transition: all var(--transition-fast);
}

.citation-card:hover {
  border-color: var(--color-brand-primary);
  box-shadow: var(--shadow-sm);
  transform: translateX(2px);
}

.citation-card.skipped {
  background: var(--color-bg-secondary);
  opacity: 0.85;
}

.citation-card.skipped:hover {
  border-color: var(--color-border);
  transform: none;
}

/* Citation Checkbox */
.citation-checkbox {
  display: flex;
  gap: var(--space-4);
  cursor: pointer;
  width: 100%;
}

.citation-checkbox input[type="checkbox"] {
  flex-shrink: 0;
  margin-top: var(--space-1);
  width: 18px;
  height: 18px;
  cursor: pointer;
}

/* Citation Content */
.citation-content {
  flex: 1;
  min-width: 0;
}

.citation-content h4 {
  margin: 0 0 var(--space-2) 0;
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  line-height: 1.4;
}

.citation-meta {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  margin: var(--space-1) 0;
  line-height: 1.5;
}

.citation-source {
  color: var(--color-text-tertiary);
  font-size: var(--text-sm);
  font-style: italic;
  margin: var(--space-1) 0;
}

.citation-doi {
  font-family: var(--font-family-mono, 'Monaco', 'Courier New', monospace);
  font-size: var(--text-xs);
  color: var(--color-info, var(--color-brand-primary));
  margin: var(--space-2) 0 0 0;
  padding: var(--space-1) var(--space-2);
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-sm);
  display: inline-block;
}

.citation-reason {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  margin: var(--space-2) 0 0 0;
  font-style: italic;
}

/* Progress Components */
.progress-container {
  background: var(--color-bg-tertiary);
  height: 8px;
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: var(--space-3);
  position: relative;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg,
    var(--color-brand-primary) 0%,
    var(--color-brand-primary-hover, var(--color-brand-primary)) 100%);
  transition: width var(--transition-base) ease-out;
  border-radius: var(--radius-full);
  position: relative;
  overflow: hidden;
}

.progress-bar::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.3) 50%,
    transparent 100%
  );
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(100%);
  }
}

.progress-text {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  margin-bottom: var(--space-4);
}

/* Live Log */
.live-log {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  font-family: var(--font-family-mono, 'Monaco', 'Courier New', monospace);
  font-size: var(--text-sm);
  max-height: 400px;
  overflow-y: auto;
  line-height: 1.6;
}

.live-log::-webkit-scrollbar {
  width: 8px;
}

.live-log::-webkit-scrollbar-track {
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
}

.live-log::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}

.log-entry {
  padding: var(--space-2) 0;
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  animation: slideIn var(--transition-base);
}

.log-entry.error {
  color: var(--color-error);
  font-weight: var(--font-medium);
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Results Stats */
.results-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

/* Error List */
.error-list {
  max-height: 300px;
  overflow-y: auto;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  font-size: var(--text-sm);
}

.error-list::-webkit-scrollbar {
  width: 8px;
}

.error-list::-webkit-scrollbar-track {
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
}

.error-list::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}

/* Modal Size Variant */
.modal-lg .modal-content {
  max-width: 900px;
  width: 90%;
}

/* Empty State for Citation Lists */
.empty-state-small {
  text-align: center;
  padding: var(--space-8) var(--space-4);
  color: var(--color-text-tertiary);
}

.empty-state-small-icon {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-3);
  opacity: 0.5;
}