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12px}.header-actions{flex-direction:column;width:100%}.back-btn,.upload-questions-btn{width:100%;justify-content:center}}.question-upload-modal{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;padding:24px}.modal-content{background:#fff;border-radius:var(--radius-lg);width:100%;max-width:700px;max-height:90vh;overflow:hidden;display:flex;flex-direction:column;box-shadow:var(--shadow-xl)}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:20px 24px;border-bottom:1px solid var(--color-border);background:var(--color-bg-secondary)}.modal-header h3{font-size:20px;font-weight:600;color:var(--color-text-primary);margin:0}.close-btn{background:none;border:none;font-size:28px;color:var(--color-text-muted);cursor:pointer;padding:0;width:36px;height:36px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-sm);transition:all var(--transition-fast)}.close-btn:hover{background:var(--color-bg-tertiary);color:var(--color-text-primary)}.modal-body{padding:24px;overflow-y:auto;flex:1}.upload-instructions{margin-bottom:24px}.upload-instructions h4{font-size:16px;font-weight:600;color:var(--color-text-primary);margin-bottom:16px}.format-info{display:grid;gap:16px;background:var(--color-bg-secondary);padding:20px;border-radius:var(--radius-md);border:1px solid var(--color-border)}.format-section{font-size:14px}.format-section strong{color:var(--color-text-primary);display:block;margin-bottom:8px}.format-section p{color:var(--color-text-secondary);margin-bottom:4px;line-height:1.5}.download-template-btn{margin-top:12px;padding:10px 16px;background:#fff;border:1px solid var(--color-primary);color:var(--color-primary);border-radius:var(--radius-md);font-weight:500;cursor:pointer;transition:all 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20px;background:#fff;border-radius:var(--radius-md);border:1px solid var(--color-border)}.file-icon{font-size:32px}.file-info{flex:1;text-align:left}.file-name{font-weight:600;color:var(--color-text-primary);margin-bottom:4px}.file-size{font-size:13px;color:var(--color-text-muted)}.remove-file{background:none;border:none;font-size:24px;color:var(--color-text-muted);cursor:pointer;padding:4px 8px;border-radius:var(--radius-sm);transition:all var(--transition-fast)}.remove-file:hover{background:var(--color-error);color:#fff}.modal-footer{display:flex;gap:12px;justify-content:flex-end;padding:16px 24px;border-top:1px solid var(--color-border);background:var(--color-bg-secondary)}.cancel-btn{padding:12px 24px;background:#fff;border:1px solid var(--color-border);color:var(--color-text-primary);border-radius:var(--radius-md);font-weight:500;cursor:pointer;transition:all var(--transition-fast)}.cancel-btn:hover{background:var(--color-bg-tertiary)}.upload-btn{padding:12px 24px;background:var(--color-gradient);color:#fff;border:none;border-radius:var(--radius-md);font-weight:600;cursor:pointer;transition:all var(--transition-fast);box-shadow:0 4px 12px #667eea4d}.upload-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 6px 20px #667eea66}.upload-btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.done-btn{padding:12px 32px;background:var(--color-success);color:#fff;border:none;border-radius:var(--radius-md);font-weight:600;cursor:pointer;transition:all var(--transition-fast)}.done-btn:hover{background:#059669;transform:translateY(-2px)}.upload-results{padding:8px}.results-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.results-header h4{font-size:18px;font-weight:600;color:var(--color-text-primary);margin:0}.status-badge{padding:6px 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var(--transition-fast)}.contact-link:hover{background:#ffffff40;transform:translateY(-2px)}@media (max-width: 768px){.course-catalog{padding:16px}.catalog-header .header-content h1{font-size:24px}.catalog-contact{padding:32px 20px}.catalog-contact h3{font-size:22px}}