/* =====================================================
   GRADE BOOK STYLES
   ===================================================== */

.grade-book-page {
  min-height: 100vh;
  background: var(--bg-primary);
  color: var(--text-primary);
}

/* Header */
.gb-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem 2rem;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.gb-header-left {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.gb-back-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-secondary);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

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

.gb-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0;
}

.gb-header-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.gb-user-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 1rem;
  background: var(--bg-secondary);
  border-radius: 10px;
}

.gb-user-avatar {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, #10b981, #059669);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 800;
  font-size: 0.9rem;
}

/* Main Content */
.gb-main {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem;
}

/* Class Selector */
.gb-class-selector {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.gb-class-selector label {
  font-weight: 700;
  color: var(--text-primary);
}

.gb-class-selector select {
  flex: 1;
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  cursor: pointer;
}

/* Buttons */
.gb-btn-primary {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: linear-gradient(135deg, #10b981, #059669);
  border: none;
  border-radius: 10px;
  color: white;
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
}

.gb-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(16, 185, 129, 0.3);
}

.gb-btn-secondary {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
}

.gb-btn-secondary:hover {
  background: var(--bg-hover);
}

/* Tabs */
.gb-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2rem;
  padding: 0.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.gb-tab {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem;
  background: transparent;
  border: none;
  border-radius: 8px;
  color: var(--text-secondary);
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
}

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

.gb-tab.active {
  background: linear-gradient(135deg, #10b981, #059669);
  color: white;
}

/* Tab Content */
.gb-content {
  position: relative;
}

.gb-tab-content {
  display: none;
}

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

/* Section Header */
.gb-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.gb-section-header h2 {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0;
}

.gb-grade-actions,
.gb-report-actions {
  display: flex;
  gap: 0.75rem;
}

/* Empty State */
.gb-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem 2rem;
  text-align: center;
}

.gb-empty-state svg {
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.gb-empty-state p {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 0.5rem 0;
}

.gb-empty-state span {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Assignments List */
.gb-assignments-list {
  display: grid;
  gap: 1rem;
}

.gb-assignment-card {
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: all 0.2s;
}

.gb-assignment-card:hover {
  border-color: #10b981;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.1);
}

.gb-assignment-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.gb-assignment-info h3 {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0 0 0.25rem 0;
}

.gb-assignment-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.gb-assignment-actions {
  display: flex;
  gap: 0.5rem;
}

.gb-icon-btn {
  padding: 0.5rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
}

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

.gb-assignment-stats {
  display: flex;
  gap: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.gb-stat {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.gb-stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
}

.gb-stat-value {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-primary);
}

/* Grade Entry */
.gb-grade-selector {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.gb-grade-selector label {
  font-weight: 700;
  color: var(--text-primary);
}

.gb-grade-selector select {
  flex: 1;
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  cursor: pointer;
}

.gb-grade-table-container {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.gb-grade-table {
  width: 100%;
  border-collapse: collapse;
}

.gb-grade-table thead {
  background: var(--bg-secondary);
}

.gb-grade-table th {
  padding: 1rem;
  text-align: left;
  font-weight: 800;
  color: var(--text-primary);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.gb-grade-table td {
  padding: 1rem;
  border-top: 1px solid var(--border);
}

.gb-grade-input {
  width: 100px;
  padding: 0.5rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-primary);
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
  text-align: center;
}

.gb-grade-input:focus {
  outline: none;
  border-color: #10b981;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.gb-grade-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0.75rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 700;
}

.gb-grade-badge.excellent {
  background: rgba(16, 185, 129, 0.1);
  color: #10b981;
}

.gb-grade-badge.good {
  background: rgba(251, 191, 36, 0.1);
  color: #f59e0b;
}

.gb-grade-badge.poor {
  background: rgba(239, 68, 68, 0.1);
  color: #ef4444;
}

.gb-grade-badge.missing {
  background: rgba(156, 163, 175, 0.1);
  color: #6b7280;
}

/* Categories List */
.gb-categories-list {
  display: grid;
  gap: 1rem;
}

.gb-category-card {
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.gb-category-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.gb-category-info h3 {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0 0 0.25rem 0;
}

.gb-category-weight {
  font-size: 1.5rem;
  font-weight: 800;
  color: #10b981;
}

/* Reports Grid */
.gb-reports-grid {
  display: grid;
  gap: 1.5rem;
}

.gb-report-card {
  padding: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.gb-report-card h3 {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0 0 1rem 0;
}

/* Modal Styles */
.gb-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 2rem;
}

.gb-modal-content {
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  background: var(--bg-card);
  border-radius: 16px;
  padding: 2rem;
}

.gb-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.gb-modal-header h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0;
}

.gb-modal-close {
  padding: 0.5rem;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
}

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

.gb-form-group {
  margin-bottom: 1.5rem;
}

.gb-form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 700;
  color: var(--text-primary);
  font-size: 0.9rem;
}

.gb-form-group input,
.gb-form-group select,
.gb-form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  font-size: 0.95rem;
}

.gb-form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.gb-form-group input:focus,
.gb-form-group select:focus,
.gb-form-group textarea:focus {
  outline: none;
  border-color: #10b981;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.gb-modal-actions {
  display: flex;
  gap: 1rem;
  justify-content: flex-end;
  margin-top: 2rem;
}

/* Responsive */
@media (max-width: 768px) {
  .gb-header {
    flex-direction: column;
    gap: 1rem;
  }

  .gb-class-selector {
    flex-direction: column;
    align-items: stretch;
  }

  .gb-tabs {
    flex-direction: column;
  }

  .gb-section-header {
    flex-direction: column;
    align-items: stretch;
    gap: 1rem;
  }

  .gb-grade-actions,
  .gb-report-actions {
    flex-direction: column;
  }
}

/* Animations */
@keyframes spin {
  to { transform: rotate(360deg); }
}