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16px;font-size:12px;text-align:center;position:sticky;top:48px;z-index:99}.network-banner.offline{background:#fff3cd;color:#856404}.network-banner.saved{background:#d4edda;color:#155724}.exam-body{display:flex;flex:1;overflow:hidden}.exam-main{flex:1;display:flex;flex-direction:column;overflow-y:auto;padding-bottom:80px}.exam-question{padding:24px 16px;flex:1}.question-header{display:flex;align-items:center;gap:8px;margin-bottom:16px}.question-number{font-size:14px;font-weight:600;color:var(--color-primary)}.question-type{font-size:12px;color:var(--color-text-secondary);background:var(--color-bg);padding:2px 8px;border-radius:4px}.question-score{font-size:12px;color:var(--color-text-tertiary)}.question-stem{font-size:16px;line-height:1.7;color:var(--color-text);margin-bottom:24px;white-space:pre-wrap}.question-options{display:flex;flex-direction:column;gap:12px}.option-btn{display:flex;align-items:flex-start;gap:12px;padding:14px 16px;border:1.5px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-surface);cursor:pointer;transition:all .15s ease;text-align:left;min-height:44px;font-size:15px;color:var(--color-text)}.option-btn:hover{border-color:var(--color-primary);background:#3370ff0a}.option-btn.selected{border-color:var(--color-primary);background:#3370ff14}.option-marker{display:flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:50%;border:1.5px solid var(--color-border);font-size:14px;font-weight:500;color:var(--color-text-secondary);flex-shrink:0;transition:all .15s ease}.option-marker.selected{background:var(--color-primary);border-color:var(--color-primary);color:#fff}.option-text{flex:1;line-height:1.6;padding-top:2px}.exam-bottom-actions{display:flex;gap:8px;padding:12px 16px;background:var(--color-surface);border-top:1px solid var(--color-border-light);position:fixed;bottom:0;left:0;right:0;z-index:100;justify-content:center}.exam-bottom-actions .btn{min-width:80px}.exam-sidebar{width:280px;border-left:1px solid var(--color-border-light);background:var(--color-surface);display:flex;flex-direction:column;overflow-y:auto;padding:16px}.sidebar-actions{display:flex;flex-direction:column;gap:8px;margin-top:16px;padding-top:16px;border-top:1px solid var(--color-border-light)}.answer-sheet{display:flex;flex-direction:column}.answer-sheet-header{margin-bottom:16px}.answer-sheet-title{font-size:15px;font-weight:600;margin-bottom:8px}.answer-sheet-stats{display:flex;gap:16px;font-size:12px}.stat-item{display:flex;align-items:center;gap:4px}.stat-item:before{content:"";display:inline-block;width:8px;height:8px;border-radius:2px}.stat-answered:before{background:var(--color-success)}.stat-unanswered:before{background:var(--color-border)}.stat-marked:before{background:var(--color-warning)}.answer-sheet-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin-bottom:16px}.sheet-item{width:100%;aspect-ratio:1;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-sm);border:1.5px solid var(--color-border);font-size:14px;font-weight:500;cursor:pointer;transition:all .15s ease;min-height:44px;background:var(--color-surface)}.sheet-item:hover{transform:scale(1.05)}.sheet-current{background:var(--color-primary);border-color:var(--color-primary);color:#fff;box-shadow:0 0 0 2px #3370ff4d}.sheet-answered{background:#e8f5e9;border-color:var(--color-success);color:var(--color-success)}.sheet-unanswered{background:var(--color-bg);color:var(--color-text-tertiary)}.sheet-marked{background:#fff3e0;border-color:var(--color-warning);color:var(--color-warning)}.answer-sheet-legend{display:flex;flex-wrap:wrap;gap:12px;font-size:12px;color:var(--color-text-secondary)}.legend-item{display:flex;align-items:center;gap:4px}.legend-dot{width:10px;height:10px;border-radius:2px;display:inline-block}.legend-dot.current{background:var(--color-primary)}.legend-dot.answered{background:var(--color-success)}.legend-dot.unanswered{background:var(--color-border)}.legend-dot.marked{background:var(--color-warning)}.drawer-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;z-index:200;display:flex;align-items:flex-end;animation:fadeIn .2s ease}.drawer{background:var(--color-surface);border-radius:16px 16px 0 0;width:100%;max-height:75vh;overflow-y:auto;padding:16px 20px 24px;animation:slideUp .25s ease}@keyframes slideUp{0%{transform:translateY(100%)}to{transform:translateY(0)}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.drawer-handle{width:36px;height:4px;background:var(--color-border);border-radius:2px;margin:0 auto 16px}.drawer-actions{display:flex;gap:8px;margin-top:16px;padding-top:16px;border-top:1px solid var(--color-border-light)}.drawer-actions .btn{flex:1}.exam-instructions-page{background:var(--color-bg)}.exam-instructions-content{max-width:600px;margin:0 auto;padding:24px 16px;display:flex;flex-direction:column;gap:16px}.exam-info-card{padding:24px}.exam-title{font-size:20px;font-weight:600;margin-bottom:8px}.exam-desc{color:var(--color-text-secondary);font-size:14px;margin-bottom:20px;line-height:1.6}.exam-info-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:16px}.exam-info-item{display:flex;align-items:center;gap:12px;padding:12px;background:var(--color-bg);border-radius:var(--radius-sm)}.exam-info-icon{font-size:24px;flex-shrink:0}.exam-info-label{font-size:12px;color:var(--color-text-secondary);margin-bottom:2px}.exam-info-value{font-size:16px;font-weight:600}.exam-deadline{display:flex;align-items:center;gap:8px;padding:10px 12px;background:var(--color-bg);border-radius:var(--radius-sm);font-size:13px;color:var(--color-text-secondary)}.exam-rules-card{padding:20px 24px;background:var(--color-surface);border-radius:var(--radius-md)}.exam-rules-title{font-size:15px;font-weight:600;margin-bottom:12px}.exam-rules-list{list-style:none;padding:0}.exam-rules-list li{position:relative;padding:6px 0 6px 20px;font-size:14px;color:var(--color-text-secondary);line-height:1.6}.exam-rules-list li:before{content:"•";position:absolute;left:4px;color:var(--color-primary);font-weight:700}.exam-actions{display:flex;justify-content:center;padding:8px 0}.exam-actions .btn-lg{padding:12px 48px;font-size:16px}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;z-index:300;display:flex;align-items:center;justify-content:center;padding:24px;animation:fadeIn .2s ease}.modal-dialog{background:var(--color-surface);border-radius:var(--radius-lg);width:100%;max-width:360px;padding:24px;box-shadow:0 8px 32px #0000001f;animation:slideUp .2s ease}.modal-title{font-size:17px;font-weight:600;margin-bottom:16px;text-align:center}.modal-body{margin-bottom:20px}.modal-body p{font-size:14px;color:var(--color-text-secondary);text-align:center;line-height:1.6}.modal-footer{display:flex;gap:8px;justify-content:center}.modal-footer .btn{flex:1;min-width:0}.confirm-info{display:flex;flex-direction:column;gap:8px;margin-bottom:16px}.confirm-item{display:flex;justify-content:space-between;align-items:center;padding:8px 12px;background:var(--color-bg);border-radius:var(--radius-sm)}.confirm-label{font-size:13px;color:var(--color-text-secondary)}.confirm-value{font-size:14px;font-weight:500}.confirm-warning{padding:10px 12px;background:#fff3e0;border-radius:var(--radius-sm);font-size:13px;color:#e65100;text-align:center}.submit-stats{display:flex;justify-content:space-around;margin-bottom:12px}.submit-stat-item{display:flex;flex-direction:column;align-items:center;gap:4px}.submit-stat-label{font-size:12px;color:var(--color-text-secondary)}.submit-stat-value{font-size:24px;font-weight:700}.submit-stat-value.answered{color:var(--color-success)}.submit-stat-value.unanswered{color:var(--color-text-tertiary)}.submit-stat-value.marked{color:var(--color-warning)}.exam-result-page{background:var(--color-bg)}.exam-result-content{max-width:480px;margin:0 auto;padding:24px 16px;display:flex;flex-direction:column;gap:16px}.result-card{padding:32px 24px;text-align:center}.result-badge{display:inline-block;padding:6px 20px;border-radius:20px;font-size:16px;font-weight:600;margin-bottom:16px}.result-badge.passed{background:#e8f5e9;color:#2e7d32}.result-badge.failed{background:#ffebee;color:#c62828}.result-score{font-size:64px;font-weight:700;color:var(--color-text);line-height:1;margin-bottom:4px}.result-score-label{font-size:18px;color:var(--color-text-secondary);margin-bottom:24px}.result-detail{display:flex;justify-content:center;gap:32px}.result-detail-item{display:flex;flex-direction:column;align-items:center;gap:4px}.result-detail-label{font-size:12px;color:var(--color-text-secondary)}.result-detail-value{font-size:15px;font-weight:600}.error-alert{padding:10px 16px;background:#ffebee;border-radius:var(--radius-sm);color:var(--color-danger);font-size:13px;text-align:center}.toast{position:fixed;top:60px;left:50%;transform:translate(-50%);padding:10px 20px;border-radius:var(--radius-sm);font-size:14px;z-index:400;cursor:pointer;box-shadow:var(--shadow-md)}.toast-error{background:#ffebee;color:var(--color-danger)}@media (min-width: 768px){.exam-attempt-page.desktop .exam-body{max-width:1100px;margin:0 auto}.exam-attempt-page.desktop .exam-main{max-width:780px;margin:0 auto;padding-bottom:80px}.exam-attempt-page.desktop .exam-question{padding:32px 24px}.exam-attempt-page.desktop .question-stem{font-size:17px}.exam-attempt-page.desktop .exam-bottom-actions{max-width:780px;left:50%;transform:translate(-50%);border-radius:var(--radius-md) var(--radius-md) 0 0;border:1px solid var(--color-border-light);border-bottom:none}}.btn-icon{background:none;border:none;font-size:15px;color:var(--color-text-secondary);cursor:pointer;padding:4px 8px;border-radius:var(--radius-sm)}.btn-icon:hover{background:var(--color-bg);color:var(--color-text)}.btn-danger{background:var(--color-danger);color:#fff;border:none;border-radius:var(--radius-sm);padding:8px 16px;font-size:14px;cursor:pointer;transition:opacity .15s}.btn-danger:hover{opacity:.9}.btn-block{width:100%}.btn-lg{padding:12px 32px;font-size:16px}