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#0f0f10);min-height:100vh;color-scheme:dark}.assignment-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:30px;padding-bottom:20px;border-bottom:2px solid var(--border-color, #e1e5e9)}.assignment-header h2{color:var(--text-primary, #2c3e50);font-size:2rem;font-weight:600;margin:0}.header-actions{display:flex;gap:20px;align-items:center}.view-modes{display:flex;gap:10px;background:var(--bg-secondary, #f8f9fa);padding:4px;border-radius:8px;border:1px solid var(--border-color, #e1e5e9)}.view-btn{padding:8px 16px;border:none;background:transparent;color:var(--text-secondary, #6c757d);border-radius:6px;cursor:pointer;font-weight:500;transition:all .2s ease}.view-btn:hover{background:var(--bg-primary, #ffffff);color:var(--text-primary, #2c3e50)}.view-btn.active{background:var(--primary-color, #3498db);color:#fff;box-shadow:0 2px 4px #3498db33}.assignment-filters{display:flex;gap:20px;margin-bottom:30px;padding:20px;background:var(--bg-secondary, 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#2c3e50);font-size:1.5rem;font-weight:600;margin:0}.close-btn{background:none;border:none;font-size:24px;color:var(--text-secondary, #6c757d);cursor:pointer;padding:5px;border-radius:50%;width:35px;height:35px;display:flex;align-items:center;justify-content:center;transition:all .2s ease}.close-btn:hover{background:var(--bg-secondary, #f8f9fa);color:var(--text-primary, #2c3e50)}.assignment-form{padding:30px}.form-row{display:flex;gap:20px;margin-bottom:20px}.form-group{flex:1}.form-group label{display:block;margin-bottom:8px;color:var(--text-primary, #2c3e50);font-weight:500;font-size:14px}.form-group input,.form-group select,.form-group textarea{width:100%;padding:12px 16px;border:1px solid var(--border-color, #e1e5e9);border-radius:8px;background:#1a1a1b;color:#e6e6e6;font-size:14px;transition:all .2s ease;box-sizing:border-box}.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:#2d7dd2;box-shadow:0 0 0 2px #2d7dd240}.form-group 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#6c757d)}.enroll-container{padding:16px}.enroll-title{font-size:28px;font-weight:700;margin-bottom:12px}.metrics{display:grid;grid-template-columns:repeat(3,minmax(160px,1fr));gap:12px;margin:12px 0 16px}.metric{background:#f7f8fb;border:1px solid #e6e8ef;border-radius:8px;padding:12px}.metric-label{font-size:12px;color:#6b7280}.metric-value{display:block;font-size:20px;font-weight:600;color:#111827}.filters{display:flex;gap:12px;align-items:center;margin-bottom:12px}.search-input{padding:8px 10px;border:1px solid #d1d5db;border-radius:6px;min-width:240px}.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:12px}.course-card{border:1px solid #e5e7eb;border-radius:8px;padding:12px;background:#fff;box-shadow:0 1px 2px #0000000a}.card-header{display:flex;justify-content:space-between;align-items:center}.card-sub{color:#4b5563;font-size:13px;margin-top:4px}.card-actions{display:flex;gap:8px;margin-top:8px}.card-actions button{padding:8px 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