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var(--border-color)}.exam-progress-header{display:flex;justify-content:space-between;margin-bottom:10px;font-weight:500}.exam-period-indicator{height:20px;display:flex;border-radius:4px;overflow:hidden;margin-bottom:10px}.period-learning{background-color:var(--exam-midterm);height:100%}.period-maintenance{background-color:var(--exam-final);height:100%}.period-retrievability{background-color:var(--exam-quiz);height:100%}.exam-period-labels{display:flex;justify-content:space-between;font-size:.8rem;color:var(--text-light)}.exam-lectures{padding:15px}.exam-lectures-header{display:flex;justify-content:space-between;align-items:center}.lecture-selector{max-height:300px;overflow-y:auto;border:1px solid var(--border-color);border-radius:var(--border-radius);background-color:var(--card)}.lecture-selector-group-header{padding:10px 15px;background-color:var(--secondary);font-weight:600;border-bottom:1px solid var(--border-color);position:sticky;top:0;z-index:1}.lecture-selector-item{padding:10px 15px;border-bottom:1px solid var(--border-color);display:flex;align-items:center;cursor:pointer}.lecture-selector-item:last-child{border-bottom:none}.lecture-selector-item:hover{background-color:var(--secondary)}.lecture-selector-item.selected{background-color:#3b82f61a}.lecture-selector-checkbox{margin-right:10px}.lecture-selector-title{font-weight:500;flex:1}.lecture-selector-meta{color:var(--text-light);font-size:.9rem}.radio-group{display:flex;flex-direction:column;gap:10px;margin-top:10px}.radio-option{display:flex;padding:10px;border:1px solid var(--border-color);border-radius:var(--border-radius);cursor:pointer}.radio-option:hover{background-color:var(--secondary)}.radio-option.selected{border-color:var(--accent);background-color:#3b82f61a}.radio-option 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var(--border-color)}.lecture-title{font-size:1.1rem;font-weight:600;margin-bottom:5px}.lecture-meta{display:flex;flex-wrap:wrap;gap:15px;font-size:.9rem;color:var(--text-light)}.lecture-actions{display:flex;gap:10px}.department-stat-row{display:flex;justify-content:space-between;align-items:center;padding:10px 0;border-bottom:1px solid var(--border-color)}.department-stat-row:last-child{border-bottom:none}.department-name{font-weight:600}.department-progress{width:100px}.department-actions{display:flex;gap:10px}.overdue{border-left:3px solid var(--danger);padding-left:8px}.overdue-label{color:var(--danger);font-weight:500}@media(max-width:768px){.stats-grid{grid-template-columns:1fr}.exam-card-header{flex-direction:column}.exam-actions{margin-top:10px;width:100%}.radio-group{flex-direction:column}.lecture-item{flex-direction:column;align-items:flex-start}.lecture-actions{margin-top:10px;width:100%}.lecture-meta{flex-direction:column;gap:5px}}.activity-heatmap{display:flex;flex-direction:column;gap:8px;overflow-x:auto;width:100%}.heatmap-header{display:flex;justify-content:flex-end;margin-bottom:12px;flex-wrap:wrap}.heatmap-stats{display:flex;gap:32px;flex-wrap:wrap}.heatmap-stat{display:flex;flex-direction:column;align-items:flex-end}.heatmap-stat-value{font-size:1.5rem;font-weight:700;color:var(--text-color, #fff)}.heatmap-stat-unit{font-size:.9rem;font-weight:400;color:var(--text-light)}.heatmap-stat-label{font-size:.75rem;color:var(--text-light);text-transform:uppercase;letter-spacing:.5px}.heatmap-months-row{display:flex;gap:3px;margin-bottom:4px;padding-left:32px}.heatmap-month{font-size:10px;color:var(--text-light);text-align:left;flex:1;white-space:nowrap}.heatmap-content{display:flex;flex-direction:column;width:100%}.heatmap-grid-container{display:flex;flex-direction:column;gap:3px;width:100%}.heatmap-row{display:flex;gap:3px;align-items:center}.heatmap-cell{aspect-ratio:1 / 1;flex:1;min-width:10px;border-radius:2px;cursor:pointer;transition:all .2s ease}.heatmap-cell.month-separator{box-shadow:inset 3px 0 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rgba(99,102,241,.15);transition:all .3s cubic-bezier(.4,0,.2,1)}.quick-stat:hover{transform:translateY(-4px);box-shadow:0 8px 24px #6366f14d;border-color:#6366f166}.quick-stat-icon{width:56px;height:56px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:1.6rem;flex-shrink:0}.streak-stat .quick-stat-icon{background:linear-gradient(135deg,#ff6b35,#f7931e);color:#fff}.due-stat .quick-stat-icon{background:linear-gradient(135deg,#6366f1,#8b5cf6);color:#fff}.xp-stat .quick-stat-icon{background:linear-gradient(135deg,#10b981,#059669);color:#fff}.time-stat .quick-stat-icon{background:linear-gradient(135deg,#f59e0b,#d97706);color:#fff}.interval-stat .quick-stat-icon{background:linear-gradient(135deg,#06b6d4,#0891b2);color:#fff}.quick-stat-info{display:flex;flex-direction:column}.quick-stat-value{font-size:1.75rem;font-weight:700;color:var(--text-primary);line-height:1.2}.quick-stat-label{font-size:.9rem;color:var(--text-secondary);font-weight:500}@media(max-width:1200px){.dashboard-quick-stats{grid-template-columns:repeat(2,1fr)}}@media(max-width:992px){.dashboard-quick-stats{grid-template-columns:repeat(2,1fr);gap:12px}.quick-stat{padding:18px;min-width:0}.quick-stat-icon{width:44px;height:44px;font-size:1.3rem;flex-shrink:0}.quick-stat-value{font-size:1.4rem}.quick-stat-label{font-size:.8rem}.quick-stat-info{min-width:0;overflow:hidden}}@media(max-width:480px){.dashboard-quick-stats{gap:10px}.quick-stat{padding:12px 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var(--border)}.inbox-reference-label{font-size:.85rem;color:var(--text-light);margin-bottom:6px}.inbox-reference-content{padding:10px;background:var(--bg);border-radius:6px;font-size:.9rem;color:var(--text-light);font-style:italic}.inbox-message-actions{display:flex;gap:8px;margin-top:12px;padding-top:12px;border-top:1px solid var(--border)}.inbox-empty{text-align:center;padding:40px 20px;color:var(--text-light)}.inbox-empty i{font-size:3rem;margin-bottom:15px;opacity:.5}.inbox-badge{background:var(--danger);color:#fff;border-radius:12px;padding:2px 6px;font-size:.75rem;font-weight:600;margin-left:auto}.loading-state{text-align:center;padding:40px 20px;color:var(--text-light)}.loading-state .spinner{margin:0 auto 15px}#lecture-info-modal .modal-header h2{display:flex;align-items:center;gap:10px}#lecture-info-modal .modal-header h2 i{color:var(--accent)}.lecture-info-form{display:flex;flex-direction:column;gap:20px}.lecture-info-form 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