/* Components CSS - Reusable component styles */

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

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

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

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

.btn-secondary {
  color: var(--gray-700);
  background-color: var(--white);
  border-color: var(--gray-300);
}

.btn-secondary:hover {
  background-color: var(--gray-50);
  border-color: var(--gray-400);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

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

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

.btn-danger:hover {
  background-color: #dc2626;
  border-color: #dc2626;
}

/* Button Sizes */
.btn-small {
  padding: var(--spacing-2) var(--spacing-4);
  font-size: var(--font-size-sm);
}

.btn-large {
  padding: var(--spacing-4) var(--spacing-8);
  font-size: var(--font-size-lg);
}

.btn-full {
  width: 100%;
}

/* Form Components */
.form-group {
  margin-bottom: var(--spacing-6);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-2);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--gray-700);
}

.form-input,
.form-select,
.form-textarea {
  display: block;
  width: 100%;
  padding: var(--spacing-4) var(--spacing-4);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--gray-900);
  background-color: var(--white);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-xl);
  transition: all var(--transition-normal);
  font-weight: var(--font-weight-medium);
  box-shadow: var(--shadow-sm);
}

.form-input:hover,
.form-select:hover,
.form-textarea:hover {
  border-color: var(--gray-300);
  background-color: var(--gray-50);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  background-color: var(--white);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1), var(--shadow-md);
  transform: translateY(-1px);
}

.form-input::placeholder {
  color: var(--gray-400);
  font-weight: var(--font-weight-normal);
}

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

.form-input:invalid:focus {
  box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.1), var(--shadow-md);
}

.form-error {
  margin-top: var(--spacing-1);
  font-size: var(--font-size-sm);
  color: var(--error-color);
  opacity: 0;
  transform: translateY(-10px);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.form-error.show {
  opacity: 1;
  transform: translateY(0);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-4);
}

/* Checkbox and Toggle Components */
.checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  cursor: pointer;
  user-select: none;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-2) var(--spacing-3);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.checkbox-label:hover {
  background-color: var(--gray-100);
}

.checkbox-custom {
  position: relative;
  width: 20px;
  height: 20px;
  border: 2px solid var(--gray-300);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  background-color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
}

.checkbox-label:hover .checkbox-custom {
  border-color: var(--primary-color);
  transform: scale(1.05);
}

.checkbox-label input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.checkbox-label input[type="checkbox"]:checked + .checkbox-custom {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  transform: scale(1.1);
}

.checkbox-label input[type="checkbox"]:checked + .checkbox-custom::after {
  content: '✓';
  color: var(--white);
  font-size: 12px;
  font-weight: bold;
}

.checkbox-label input[type="checkbox"]:focus + .checkbox-custom {
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.toggle-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

.toggle-switch {
  position: relative;
  width: 48px;
  height: 24px;
}

.toggle-switch input[type="checkbox"] {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--gray-300);
  border-radius: var(--radius-full);
  transition: var(--transition-fast);
}

.toggle-slider::before {
  position: absolute;
  content: '';
  height: 20px;
  width: 20px;
  left: 2px;
  bottom: 2px;
  background-color: var(--white);
  border-radius: 50%;
  transition: var(--transition-fast);
}

.toggle-switch input:checked + .toggle-slider {
  background-color: var(--primary-color);
}

.toggle-switch input:checked + .toggle-slider::before {
  transform: translateX(24px);
}

/* Card Components */
.card {
  background-color: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

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

.card-header {
  padding: var(--spacing-6);
  border-bottom: 1px solid var(--gray-200);
}

.card-body {
  padding: var(--spacing-6);
}

.card-footer {
  padding: var(--spacing-6);
  border-top: 1px solid var(--gray-200);
  background-color: var(--gray-50);
}

/* Modal Components */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  backdrop-filter: blur(5px);
  /* Ensure modal is perfectly centered */
  align-items: center !important;
  justify-content: center !important;
  /* Additional centering fixes */
  text-align: center;
}

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

.modal-content {
  background: linear-gradient(135deg, var(--white) 0%, var(--gray-50) 100%);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-2xl);
  max-width: 90vw;
  max-height: 90vh;
  overflow: hidden;
  transform: scale(0.9) translateY(20px);
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  animation: modalEntrance 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
  /* Ensure content doesn't exceed viewport */
  max-width: 90vw;
  max-height: 90vh;
  width: 100%;
  /* Additional centering fixes */
  margin: auto;
  text-align: left;
}

.modal.active .modal-content {
  transform: scale(1) translateY(0);
}

@keyframes modalEntrance {
  0% {
    transform: scale(0.9) translateY(20px);
    opacity: 0;
  }
  100% {
    transform: scale(1) translateY(0);
    opacity: 1;
  }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-6);
  border-bottom: 1px solid var(--gray-200);
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  color: var(--white);
}

.modal-header h3 {
  margin: 0;
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
}

.modal-close {
  background: none;
  border: none;
  font-size: var(--font-size-2xl);
  cursor: pointer;
  color: var(--white);
  transition: color var(--transition-fast);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.modal-close:hover {
  background-color: rgba(255, 255, 255, 0.2);
  color: var(--white);
}

.modal-body {
  padding: var(--spacing-6);
  max-height: 60vh;
  overflow-y: auto;
}

.modal-footer {
  display: flex;
  gap: var(--spacing-3);
  justify-content: flex-end;
  padding: var(--spacing-6);
  border-top: 1px solid var(--gray-200);
  background-color: var(--gray-50);
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
  backdrop-filter: blur(10px);
}

/* Mobile-specific modal adjustments */
@media (max-width: 767px) {
  .modal-content {
    max-width: 95vw;
    max-height: 95vh;
    width: 95vw;
    margin: 1rem auto;
  }
  
  .modal-header {
    padding: 1rem;
    text-align: center;
  }
  
  .modal-header h3 {
    font-size: 1.5rem;
  }
  
  .modal-body {
    padding: 1rem;
    max-height: 70vh;
  }
  
  .modal-footer {
    padding: 1rem;
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .modal-footer .btn {
    width: 100%;
    padding: 1rem;
    font-size: 1.1rem;
  }
}

/* Exam Configuration Modal */
.exam-config-modal {
  max-width: 800px;
  width: 90%;
  border: 1px solid rgba(0, 0, 0, 0.1);
  /* Ensure modal stays centered with large content */
  margin: auto;
  align-self: center;
  justify-self: center;
  border-radius: var(--radius-xl);
}

.exam-config-modal .subject-card {
  margin-bottom: var(--spacing-6);
  background: linear-gradient(135deg, var(--white) 0%, var(--gray-50) 100%);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(0, 0, 0, 0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  text-align: center;
  padding: 1rem;
  border-radius: var(--radius-lg);
}

.exam-config-modal .subject-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.exam-config-modal .config-card {
  background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 100%);
  border-radius: var(--radius-lg);
  padding: var(--spacing-6);
  box-shadow: var(--shadow-inner);
  border: 1px solid rgba(0, 0, 0, 0.05);
}

.exam-config-modal .config-label {
  display: block;
  margin-bottom: var(--spacing-2);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--gray-800);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.exam-config-modal .config-select {
  width: 100%;
  padding: var(--spacing-3) var(--spacing-4);
  font-size: var(--font-size-base);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-lg);
  background-color: var(--white);
  transition: all var(--transition-fast);
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  background-size: 1em;
  appearance: none;
}

.exam-config-modal .config-select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1), var(--shadow-md);
  transform: translateY(-2px);
}

.exam-config-modal .config-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-6);
  margin-bottom: var(--spacing-6);
}

.exam-config-modal .config-group {
  margin-bottom: var(--spacing-4);
}

.exam-config-modal .checkbox-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3);
  background: var(--white);
  padding: var(--spacing-4);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
  max-height: 200px;
  overflow-y: auto;
}

/* Mobile-specific exam config adjustments */
@media (max-width: 767px) {
  .exam-config-modal {
    width: 95vw;
    max-width: 95vw;
    margin: 1rem auto;
  }
  
  .exam-config-modal .subject-card {
    padding: 0.75rem;
  }
  
  .exam-config-modal .subject-icon-large {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
  }
  
  .exam-config-modal .subject-title {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
  }
  
  .exam-config-modal .subject-description {
    font-size: 0.9rem;
    margin-bottom: 1rem;
  }
  
  .exam-config-modal .subject-stats {
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
  }
  
  .exam-config-modal .stat-item {
    flex-direction: column;
    gap: 0.25rem;
  }
  
  .exam-config-modal .config-card {
    padding: 1rem;
  }
  
  .exam-config-modal .config-header {
    text-align: center;
    margin-bottom: 1rem;
  }
  
  .exam-config-modal .config-title {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
  }
  
  .exam-config-modal .config-row {
    grid-template-columns: 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
  }
  
  .exam-config-modal .config-group {
    margin-bottom: 1rem;
  }
  
  .exam-config-modal .config-label {
    font-size: 1rem;
    margin-bottom: 0.5rem;
  }
  
  .exam-config-modal .config-select {
    padding: 0.75rem;
    font-size: 1rem;
  }
  
  .exam-config-modal .checkbox-group {
    grid-template-columns: 1fr;
    gap: 0.75rem;
    padding: 1rem;
    max-height: 150px;
  }
  
  .exam-config-modal .checkbox-label {
    padding: 0.75rem;
    font-size: 1rem;
    background-color: var(--white);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
  }
  
  .exam-config-modal .checkbox-label:hover {
    background-color: var(--gray-100);
  }
}

/* Navigation Components */
.nav-menu {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item {
  margin-bottom: var(--spacing-1);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  padding: var(--spacing-3) var(--spacing-4);
  color: var(--gray-700);
  text-decoration: none;
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}

.nav-link:hover {
  background-color: var(--gray-100);
  color: var(--gray-900);
}

.nav-item.active .nav-link {
  background-color: var(--primary-light);
  color: var(--primary-color);
  font-weight: var(--font-weight-medium);
}

.nav-icon {
  font-size: var(--font-size-lg);
}

/* Progress Components */
.progress-bar {
  width: 100%;
  height: 8px;
  background-color: var(--gray-200);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background-color: var(--primary-color);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
  animation: progressFill 1s ease-out;
}

.progress-indicator {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
  margin-bottom: var(--spacing-8);
}

.progress-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-2);
  flex: 1;
  position: relative;
}

.progress-step::after {
  content: '';
  position: absolute;
  top: 15px;
  left: 50%;
  width: 100%;
  height: 2px;
  background-color: var(--gray-200);
  z-index: -1;
}

.progress-step:last-child::after {
  display: none;
}

.progress-step.active::after {
  background-color: var(--primary-color);
}

.step-number {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background-color: var(--gray-200);
  color: var(--gray-600);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-fast);
}

.progress-step.active .step-number {
  background-color: var(--primary-color);
  color: var(--white);
}

.step-label {
  font-size: var(--font-size-sm);
  color: var(--gray-600);
  text-align: center;
}

.progress-step.active .step-label {
  color: var(--primary-color);
  font-weight: var(--font-weight-medium);
}

/* Badge Components */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-1) var(--spacing-3);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  border-radius: var(--radius-full);
}

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

.badge-success {
  color: var(--success-color);
  background-color: #d1fae5;
}

.badge-warning {
  color: var(--warning-color);
  background-color: #fef3c7;
}

.badge-error {
  color: var(--error-color);
  background-color: #fee2e2;
}

/* Tooltip Components */
.tooltip {
  position: relative;
  display: inline-block;
}

.tooltip-content {
  position: absolute;
  bottom: 125%;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--gray-900);
  color: var(--white);
  padding: var(--spacing-2) var(--spacing-3);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), visibility var(--transition-fast);
  z-index: var(--z-tooltip);
}

.tooltip-content::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: var(--gray-900);
}

.tooltip:hover .tooltip-content {
  opacity: 1;
  visibility: visible;
}

/* Spinner Components */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--gray-200);
  border-top: 2px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.spinner-large {
  width: 40px;
  height: 40px;
  border-width: 4px;
}

/* Alert Components */
.alert {
  padding: var(--spacing-4);
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  margin-bottom: var(--spacing-4);
}

.alert-success {
  color: #065f46;
  background-color: #d1fae5;
  border-color: #a7f3d0;
}

.alert-warning {
  color: #92400e;
  background-color: #fef3c7;
  border-color: #fde68a;
}

.alert-error {
  color: #991b1b;
  background-color: #fee2e2;
  border-color: #fecaca;
}

.alert-info {
  color: #0c4a6e;
  background-color: #e0f2fe;
  border-color: #b3e5fc;
}

/* Enhanced Button Styles for Welcome Page */
.btn-text {
  transition: transform var(--transition-fast);
}

.btn-icon {
  transition: transform var(--transition-fast);
  font-size: 0.9em;
}

.btn:hover .btn-icon {
  transform: translateX(4px);
}

.btn-secondary .btn-icon {
  opacity: 0.8;
}

.btn:hover .btn-secondary .btn-icon {
  opacity: 1;
}

/* Ripple effect for buttons */
.ripple {
  position: relative;
  overflow: hidden;
}

.ripple::before {
  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 0.6s, height 0.6s;
}

.ripple:active::before {
  width: 300px;
  height: 300px;
}

/* Button hover lift effect */
.btn-hover-lift {
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.btn-hover-lift:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

/* Card hover lift effect */
.card-hover-lift {
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.card-hover-lift:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
}
/* Subje
ct Browser Components */
.subject-selection-content {
  padding: var(--spacing-6);
  max-width: 1400px;
  margin: 0 auto;
}

.controls-section {
  margin-bottom: var(--spacing-8);
}

.search-filter-container {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--spacing-6);
  align-items: start;
  margin-bottom: var(--spacing-4);
}

.search-box {
  position: relative;
  max-width: 400px;
}

.search-input {
  width: 100%;
  padding: var(--spacing-3) var(--spacing-4) var(--spacing-3) var(--spacing-12);
  font-size: var(--font-size-base);
  border: 2px solid var(--gray-300);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.search-input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-btn {
  position: absolute;
  left: var(--spacing-4);
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--gray-400);
  transition: color var(--transition-fast);
}

.search-box.focused .search-btn {
  color: var(--primary-color);
}

.search-suggestions {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-dropdown);
  display: none;
  max-height: 200px;
  overflow-y: auto;
}

.suggestion-item {
  padding: var(--spacing-3) var(--spacing-4);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.suggestion-item:hover {
  background-color: var(--gray-50);
}

.suggestion-item mark {
  background-color: var(--primary-light);
  color: var(--primary-color);
  padding: 0;
}

.filter-controls {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
}

.filter-group {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.filter-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--gray-700);
  min-width: 80px;
}

.filter-buttons {
  display: flex;
  gap: var(--spacing-2);
  flex-wrap: wrap;
}

.filter-btn {
  padding: var(--spacing-2) var(--spacing-4);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-full);
  background: var(--white);
  color: var(--gray-600);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
  transform: translateY(-1px);
}

.filter-btn.active {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: var(--white);
  transform: scale(0.95);
}

.view-controls {
  display: flex;
  gap: var(--spacing-1);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-lg);
  padding: var(--spacing-1);
}

.view-btn {
  padding: var(--spacing-2);
  background: none;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--gray-500);
  transition: all var(--transition-fast);
}

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

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

.results-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-3) 0;
  color: var(--gray-600);
  font-size: var(--font-size-sm);
}

.subjects-container {
  position: relative;
  min-height: 400px;
}

.subjects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-6);
}

.subjects-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
}

.subject-card {
  position: relative;
  background: var(--white);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-xl);
  padding: var(--spacing-6);
  transition: all var(--transition-normal);
  cursor: pointer;
  overflow: hidden;
}

.subject-card:hover {
  border-color: var(--primary-color);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}

.subject-card.selected {
  border-color: var(--primary-color);
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--white) 100%);
  transform: scale(0.98);
}

.subject-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-4);
}

.subject-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-2);
}

.subject-actions {
  display: flex;
  gap: var(--spacing-2);
}

.action-btn {
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 50%;
  background: var(--gray-100);
  color: var(--gray-500);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  opacity: 0;
  transform: scale(0.8);
}

.subject-card:hover .action-btn {
  opacity: 1;
  transform: scale(1);
}

.action-btn:hover {
  background: var(--primary-color);
  color: var(--white);
  transform: scale(1.1);
}

.subject-content {
  margin-bottom: var(--spacing-6);
}

.subject-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--gray-900);
  margin-bottom: var(--spacing-2);
}

.subject-description {
  color: var(--gray-600);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-4);
}

.subject-meta {
  margin-bottom: var(--spacing-4);
}

.difficulty-indicator {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-3);
}

.difficulty-label {
  font-size: var(--font-size-sm);
  color: var(--gray-600);
}

.difficulty-stars {
  display: flex;
  gap: 2px;
}

.difficulty-stars .star {
  color: var(--gray-300);
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
}

.difficulty-stars .star.active {
  color: var(--warning-color);
}

.subject-stats {
  display: flex;
  gap: var(--spacing-4);
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
}

.stat-label {
  font-size: var(--font-size-xs);
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-value {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--gray-900);
}

.progress-section {
  margin-bottom: var(--spacing-4);
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-2);
}

.progress-label {
  font-size: var(--font-size-sm);
  color: var(--gray-600);
}

.progress-percentage {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--primary-color);
}

.progress-details {
  display: flex;
  justify-content: space-between;
  margin-top: var(--spacing-2);
  font-size: var(--font-size-xs);
  color: var(--gray-500);
}

.subject-footer {
  display: flex;
  gap: var(--spacing-3);
  justify-content: space-between;
}

.selection-indicator {
  position: absolute;
  top: var(--spacing-4);
  right: var(--spacing-4);
  width: 32px;
  height: 32px;
  background: var(--primary-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: bold;
  opacity: 0;
  transform: scale(0);
  transition: all var(--transition-normal) cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.subject-card.selected .selection-indicator {
  opacity: 1;
  transform: scale(1);
}

.loading-state,
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-12);
  text-align: center;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--gray-200);
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: var(--spacing-4);
}

.empty-state {
  color: var(--gray-500);
}

.empty-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-4);
  opacity: 0.5;
}

.selection-summary {
  background: var(--white);
  border: 2px solid var(--primary-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-6);
  margin-top: var(--spacing-8);
  animation: slideUp 0.3s ease-out;
}

.summary-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-4);
}

.summary-header h3 {
  margin: 0;
  color: var(--primary-color);
}

.selected-subjects {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-3);
  margin-bottom: var(--spacing-6);
}

.subject-chip {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-2) var(--spacing-4);
  background: var(--primary-light);
  color: var(--primary-color);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

.chip-remove {
  background: none;
  border: none;
  color: var(--primary-color);
  cursor: pointer;
  font-size: var(--font-size-lg);
  line-height: 1;
  padding: 0;
  margin-left: var(--spacing-1);
  transition: color var(--transition-fast);
}

.chip-remove:hover {
  color: var(--error-color);
}

.summary-actions {
  display: flex;
  gap: var(--spacing-3);
  justify-content: flex-end;
}

/* List view styles */
.subjects-list .subject-card {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  gap: var(--spacing-4);
  align-items: center;
  padding: var(--spacing-4);
}

.subjects-list .subject-card-header {
  margin: 0;
}

.subjects-list .subject-content {
  margin: 0;
}

.subjects-list .subject-title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-1);
}

.subjects-list .subject-description {
  margin-bottom: 0;
  font-size: var(--font-size-sm);
}

.subjects-list .subject-meta,
.subjects-list .progress-section {
  display: none;
}

.subjects-list .subject-footer {
  margin: 0;
  justify-content: flex-end;
}

/* Breadcrumb styles */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-2);
  font-size: var(--font-size-sm);
}

.breadcrumb-link {
  color: var(--gray-500);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumb-link:hover {
  color: var(--primary-color);
}

.breadcrumb-separator {
  color: var(--gray-400);
}

.breadcrumb-current {
  color: var(--gray-900);
  font-weight: var(--font-weight-medium);
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .search-filter-container {
    grid-template-columns: 1fr;
    gap: var(--spacing-4);
  }
  
  .filter-controls {
    flex-direction: column;
    gap: var(--spacing-3);
  }
  
  .filter-group {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-2);
  }
  
  .subjects-grid {
    grid-template-columns: 1fr;
  }
  
  .subject-card {
    padding: var(--spacing-4);
  }
  
  .summary-actions {
    flex-direction: column;
  }
  
  .results-info {
    flex-direction: column;
    gap: var(--spacing-2);
    align-items: flex-start;
  }
  
  .exam-config-modal .config-row {
    grid-template-columns: 1fr;
  }
  
  .exam-config-modal .checkbox-group {
    grid-template-columns: 1fr;
  }
}

/* Animation keyframes */
@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}/* 
Exam Configuration Components */
.exam-configuration {
  background: var(--white);
  border: 2px solid var(--primary-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-8);
  margin-top: var(--spacing-8);
  box-shadow: var(--shadow-xl);
}

.configuration-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-8);
  padding-bottom: var(--spacing-4);
  border-bottom: 2px solid var(--gray-200);
}

.configuration-header h2 {
  margin: 0;
  color: var(--primary-color);
  font-size: var(--font-size-2xl);
}

.configuration-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--spacing-8);
  margin-bottom: var(--spacing-8);
}

.configuration-panel {
  background: var(--gray-50);
  border-radius: var(--radius-lg);
  padding: var(--spacing-6);
}

.configuration-panel h3 {
  margin: 0 0 var(--spacing-6) 0;
  color: var(--gray-900);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
}

/* Settings Panel */
.setting-group {
  margin-bottom: var(--spacing-8);
}

.setting-label {
  display: block;
  margin-bottom: var(--spacing-3);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--gray-700);
}

.time-selector,
.question-selector {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-4);
}

.slider {
  width: 100%;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--gray-200);
  outline: none;
  margin-bottom: var(--spacing-3);
  -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary-color);
  cursor: pointer;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  transition: all var(--transition-fast);
}

.slider::-webkit-slider-thumb:hover {
  transform: scale(1.1);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

.slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary-color);
  cursor: pointer;
  border: none;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.time-display,
.questions-display {
  text-align: center;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--primary-color);
  margin-bottom: var(--spacing-3);
}

.time-presets {
  display: flex;
  gap: var(--spacing-2);
  justify-content: center;
}

.preset-btn {
  padding: var(--spacing-2) var(--spacing-3);
  font-size: var(--font-size-sm);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-md);
  background: var(--white);
  color: var(--gray-600);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.preset-btn:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
  transform: translateY(-1px);
}

.questions-distribution {
  margin-top: var(--spacing-4);
}

.distribution-item {
  display: flex;
  justify-content: space-between;
  padding: var(--spacing-2) 0;
  font-size: var(--font-size-sm);
  color: var(--gray-600);
}

.difficulty-mixer {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-4);
}

.difficulty-slider-group {
  display: grid;
  grid-template-columns: 80px 1fr 50px;
  gap: var(--spacing-3);
  align-items: center;
  margin-bottom: var(--spacing-3);
}

.difficulty-slider-group label {
  font-size: var(--font-size-sm);
  color: var(--gray-600);
}

.difficulty-slider {
  height: 4px;
}

.difficulty-percentage {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--primary-color);
  text-align: right;
}

.question-types,
.additional-options {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-4);
}

.type-checkbox,
.option-toggle {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  margin-bottom: var(--spacing-3);
}

.type-checkbox input,
.option-toggle input {
  width: 18px;
  height: 18px;
  accent-color: var(--primary-color);
}

.type-checkbox label,
.option-toggle label {
  font-size: var(--font-size-sm);
  color: var(--gray-700);
  cursor: pointer;
}

/* Drag and Drop Panel */
.drag-drop-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-6);
  height: 500px;
}

.available-questions,
.drop-zone {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-4);
  display: flex;
  flex-direction: column;
}

.available-questions h4,
.drop-zone-header h4 {
  margin: 0 0 var(--spacing-4) 0;
  font-size: var(--font-size-lg);
  color: var(--gray-900);
}

.questions-filter {
  display: flex;
  gap: var(--spacing-3);
  margin-bottom: var(--spacing-4);
}

.questions-filter select {
  flex: 1;
  padding: var(--spacing-2) var(--spacing-3);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
}

.questions-list {
  flex: 1;
  overflow-y: auto;
  border: 2px dashed var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-3);
  transition: all var(--transition-fast);
}

.questions-list.drag-active {
  border-color: var(--primary-color);
  background: var(--primary-light);
}

.questions-list.drag-over {
  border-color: var(--primary-color);
  background: rgba(37, 99, 235, 0.1);
  transform: scale(1.02);
}

.question-item {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-4);
  margin-bottom: var(--spacing-3);
  cursor: grab;
  transition: all var(--transition-fast);
}

.question-item:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.question-item.dragging {
  opacity: 0.5;
  transform: rotate(5deg);
  cursor: grabbing;
}

.question-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-3);
}

.question-meta {
  display: flex;
  gap: var(--spacing-2);
  flex-wrap: wrap;
}

.question-meta span {
  padding: var(--spacing-1) var(--spacing-2);
  font-size: var(--font-size-xs);
  border-radius: var(--radius-sm);
  font-weight: var(--font-weight-medium);
}

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

.question-difficulty {
  background: var(--warning-light);
  color: var(--warning-color);
}

.question-type {
  background: var(--gray-100);
  color: var(--gray-600);
}

.question-actions {
  display: flex;
  gap: var(--spacing-2);
}

.question-action {
  width: 24px;
  height: 24px;
  border: none;
  border-radius: 50%;
  background: var(--gray-100);
  color: var(--gray-500);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.question-action:hover {
  background: var(--primary-color);
  color: var(--white);
  transform: scale(1.1);
}

.question-content {
  margin-bottom: var(--spacing-3);
}

.question-text {
  font-size: var(--font-size-sm);
  color: var(--gray-700);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-3);
}

.question-stats {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--font-size-xs);
  color: var(--gray-500);
}

.difficulty-stars {
  display: flex;
  gap: 2px;
}

.difficulty-stars .star {
  color: var(--gray-300);
  transition: color var(--transition-fast);
}

.difficulty-stars .star.active {
  color: var(--warning-color);
}

.drop-zone-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-4);
}

.question-count {
  font-size: var(--font-size-sm);
  color: var(--gray-600);
  font-weight: var(--font-weight-medium);
}

.selected-questions {
  flex: 1;
  overflow-y: auto;
  border: 2px dashed var(--gray-300);
  border-radius: var(--radius-lg);
  padding: var(--spacing-4);
  min-height: 300px;
  transition: all var(--transition-fast);
}

.drop-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  text-align: center;
  color: var(--gray-400);
}

.placeholder-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-4);
  opacity: 0.5;
}

.placeholder-hint {
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-2);
}

.drop-zone-actions {
  display: flex;
  gap: var(--spacing-3);
  justify-content: center;
  margin-top: var(--spacing-4);
}

/* Preview Panel */
.exam-summary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-4);
  margin-bottom: var(--spacing-6);
}

.summary-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-4);
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  border: 1px solid var(--gray-200);
}

.summary-icon {
  font-size: var(--font-size-2xl);
}

.summary-content h4 {
  margin: 0 0 var(--spacing-1) 0;
  font-size: var(--font-size-sm);
  color: var(--gray-600);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.summary-content p {
  margin: 0;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--gray-900);
}

.difficulty-chart,
.subject-breakdown,
.estimated-time {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-4);
  margin-bottom: var(--spacing-4);
}

.difficulty-chart h4,
.subject-breakdown h4,
.estimated-time h4 {
  margin: 0 0 var(--spacing-4) 0;
  font-size: var(--font-size-base);
  color: var(--gray-900);
}

.chart-container {
  display: flex;
  justify-content: center;
  margin-bottom: var(--spacing-4);
}

.breakdown-item {
  display: flex;
  justify-content: space-between;
  padding: var(--spacing-2) 0;
  font-size: var(--font-size-sm);
  color: var(--gray-600);
  border-bottom: 1px solid var(--gray-100);
}

.breakdown-item:last-child {
  border-bottom: none;
}

.no-breakdown {
  text-align: center;
  color: var(--gray-400);
  font-style: italic;
  margin: 0;
}

.time-estimate {
  text-align: center;
}

.time-range {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--primary-color);
}

.time-note {
  font-size: var(--font-size-sm);
  color: var(--gray-500);
  margin: var(--spacing-2) 0 0 0;
}

.configuration-actions {
  display: flex;
  gap: var(--spacing-4);
  justify-content: center;
  padding-top: var(--spacing-6);
  border-top: 2px solid var(--gray-200);
}

/* Toast notifications */
.toast {
  animation: slideInRight 0.3s ease-out;
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Responsive adjustments */
@media (max-width: 1200px) {
  .configuration-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-6);
  }
  
  .drag-drop-container {
    grid-template-columns: 1fr;
    height: auto;
  }
  
  .exam-summary {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .exam-configuration {
    padding: var(--spacing-4);
  }
  
  .configuration-header {
    flex-direction: column;
    gap: var(--spacing-4);
    align-items: flex-start;
  }
  
  .difficulty-slider-group {
    grid-template-columns: 1fr;
    gap: var(--spacing-2);
  }
  
  .questions-filter {
    flex-direction: column;
  }
  
  .configuration-actions {
    flex-direction: column;
  }
  
  .drop-zone-actions {
    flex-direction: column;
  }
}