.form-control:focus, .form-select:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(74, 108, 247, 0.25);
        }
       
        .converter-header {
            background: linear-gradient(135deg, var(--primary-color) 0%, #6c8eff 100%);
            color: white;
            border-radius: var(--radius) var(--radius) 0 0;
            padding: 25px 20px;
            position: relative;
            overflow: hidden;
        }
        
        .converter-header::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
        }
        
        .converter-header h1 {
            position: relative;
            z-index: 1;
        }
        
        .unit-group-title {
            color: var(--primary-color);
            font-weight: 600;
            font-size: 1rem;
            margin-top: 1.5rem;
            margin-bottom: 0.75rem;
            padding-bottom: 0.5rem;
            border-bottom: 1px dashed rgba(74, 108, 247, 0.2);
            display: flex;
            align-items: center;
        }
        
        .unit-group-title i {
            margin-right: 8px;
            font-size: 1rem;
        }
        
        .result-card {
            background-color: var(--primary-lightest);
            border-left: 4px solid var(--primary-color);
            border-radius: 8px;
            padding: 8px 20px;
            transition: all 0.3s ease;
        }
        
        .result-card:hover {
            background-color: rgba(74, 108, 247, 0.12);
        }
        
        .conversion-history-item {
            padding: 12px 15px;
            border-bottom: 1px solid #eee;
            font-size: 0.95rem;
            transition: background-color 0.2s ease;
        }
        
        .conversion-history-item:hover {
            background-color: var(--primary-lightest);
        }
        
        .conversion-history-item:last-child {
            border-bottom: none;
        }
        
        .history-badge {
            background-color: var(--primary-color);
            color: white;
            font-size: 0.8rem;
            padding: 2px 8px;
            border-radius: 10px;
            margin-right: 8px;
        }
        
        .unit-box {
            background-color: white;
            border: 1px solid var(--border-color-light);
            border-radius: 8px;
            padding: 15px;
            height: 100%;
            transition: all 0.3s ease;
        }
        
        .unit-box:hover {
            border-color: var(--primary-color);
            transform: translateY(-3px);
            box-shadow: var(--shadow);
        }
        
        .unit-name {
            font-weight: 600;
            color: var(--text-color);
            font-size: 0.95rem;
            margin-bottom: 5px;
            display: flex;
            align-items: center;
        }
        
        .unit-name i {
            margin-right: 6px;
            color: var(--primary-color);
            font-size: 0.9rem;
        }
        
        .unit-value {
            font-weight: 700;
            color: var(--primary-color);
            font-size: 1.1rem;
        }
        
        .input-group #clearInput:hover {
            background-color: var(--primary-color-dark);
            border-color: var(--primary-color-dark);
            color: white;
            cursor: pointer;
        }
        
        
        
        .converter-icon {
            background-color: rgba(255, 255, 255, 0.2);
            width: 60px;
            height: 60px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 15px;
            font-size: 1.5rem;
        }
        
        @media (max-width: 768px) {
            .converter-header h1 {
                font-size: 1.5rem;
            }
            
            .tab-content {
                padding: 20px 15px;
            }
        }