.calculator-container {
            background: #2a2d30;
            color: #f8f9fa;
            border-radius: 5px;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
            margin-top: 2rem;
            overflow: hidden;
        }

        .card {
            background: #2a2d30;
            color: #f8f9fa;
            border-radius: 5px;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
            overflow: hidden;
            border: none;
        }

        .card-header {
            background: linear-gradient(45deg, #fdad35, #fdad35) !important;
            border: none;
            padding: 20px;
        }

        .card-header h2 {
            font-weight: 600;
            margin: 0;
            font-size: 1.5rem;
        }

        .power-type-selector {
            background: #495057;
            padding: 20px;
            border-radius: 8px;
            margin-bottom: 20px;
        }

        .form-check {
            margin-bottom: 10px;
            padding: 10px;
            border-radius: 8px;
            transition: all 0.3s ease;
        }


        .form-check-input:checked {
            background-color: #0d6efd;
            border-color: #0d6efd;
        }

        .form-check-label {
            font-weight: 500;
            margin-left: 8px;
            color: #f8f9fa;
        }

        .form-check .form-check-input {
            margin-left: 0em;
        }

        .form-label {
            color: #f5f5f5;
            font-weight: bold;
        }

        .input-group {
            border-radius: 8px;
            overflow: hidden;
        }

        .input-group-text {
            background: #f8f9fa;
            color: #323131;
            border: none;
            font-weight: 600;
        }

        .form-control,
        .form-select {
            background-color: #3c3f42 !important;
            color: #ccc !important;
            border: 2px solid #495057;
            border-radius: 8px;
            padding: 6px 9px;
            font-size: 1.1rem;
        }

        .form-control:focus,
        .form-select:focus {
            background-color: #3c3f42 !important;
            color: #ccc !important;
            border-color: #fdad35;
            box-shadow: 0 0 0 0.2rem rgba(253, 173, 53, 0.25);
        }

        .form-control::placeholder {
            color: #adb5bd !important;
        }

        .form-select option {
            background-color: #3c3f42;
            color: #ccc;
        }

        #convertBtn {
            background: linear-gradient(45deg, #f19b2c, #d99236);
            border: none;
            padding: 8px;
            font-size: 1.2rem;
            font-weight: 600;
            border-radius: 5px;
            transition: all 0.3s ease;
            width: 100%;
        }

        #convertBtn:hover {
            background: linear-gradient(45deg, #787c8d, #52555c);
        }

        .result-box {
            margin-top: 20px;
            border-radius: 8px;
            overflow: hidden;
            animation: fadeIn 0.5s ease-in;
        }

        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .alert-success {
            background-color: #d1edff;
            border-color: #fdad35;
            color: #0c5460;
            font-weight: 600;
        }

        .unit-badge {
            font-size: 0.9em;
            padding: 4px 8px;
        }

        .formula-container {
            background: #f8f9fa;
            border: 1px solid #dee2e6;
            border-radius: 8px;
            padding: 15px;
            font-family: 'Courier New', monospace;
            font-size: 0.9rem;
            margin-top: 10px;
        }

        .efficiency-info {
            background: rgba(253, 173, 53, 0.1);
            padding: 10px;
            border-radius: 6px;
            font-style: italic;
        }

        .input-row {
            align-items: end;
        }

        @media (max-width: 768px) {

            .card-header h2 {
                font-size: 1.5rem;
            }

            .power-type-selector .col-md-6 {
                margin-bottom: 15px;
            }
        }

        .animate-result {
            animation: slideInUp 0.5s ease-out;
        }

        @keyframes slideInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }