* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        /* Framework handles base styling */

        /* Framework handles container styling */

        /* Framework handles header styling */

        .header h1 {
            font-size: 2.5em;
            margin-bottom: 10px;
        }

        .header p {
            font-size: 1.1em;
            opacity: 0.9;
        }

        .content {
            padding: 30px;
        }

        .mode-selector {
            display: flex;
            gap: 10px;
            margin-bottom: 30px;
            flex-wrap: wrap;
        }

        .mode-btn {
            padding: 12px 24px;
            border: none;
            border-radius: 25px;
            background: #f0f0f0;
            color: #333;
            cursor: pointer;
            transition: all 0.3s ease;
            font-weight: 500;
        }

        /* Framework handles button styling */

        .calculator-section {
            display: none;
        }

        .calculator-section.active {
            display: block;
        }

        .input-group {
            margin-bottom: 20px;
        }

        .input-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #333;
        }

        .input-group input, .input-group select {
            width: 100%;
            padding: 12px;
            border: 2px solid #e0e0e0;
            border-radius: 10px;
            font-size: 16px;
            transition: border-color 0.3s ease;
        }

        .input-group input:focus, .input-group select:focus {
            outline: none;
            border-color: #667eea;
        }

        /* Framework handles button styling */

        .result {
            background: #f8f9fa;
            padding: 20px;
            border-radius: 10px;
            margin-top: 20px;
            display: none;
        }

        .result.show {
            display: block;
        }

        .result h3 {
            color: #667eea;
            margin-bottom: 15px;
        }

        .result-item {
            display: flex;
            justify-content: space-between;
            margin-bottom: 10px;
            padding: 10px;
            background: white;
            border-radius: 8px;
        }

        .result-label {
            font-weight: 600;
            color: #333;
        }

        .result-value {
            font-weight: 700;
            color: #667eea;
        }

        .efficiency-bar {
            width: 100%;
            height: 20px;
            background: #e0e0e0;
            border-radius: 10px;
            overflow: hidden;
            margin: 10px 0;
        }

        .efficiency-fill {
            height: 100%;
            background: linear-gradient(90deg, #ff6b6b, #4ecdc4, #45b7d1);
            transition: width 0.5s ease;
        }

        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 15px;
        }

        .comparison-table th, .comparison-table td {
            padding: 12px;
            text-align: left;
            border-bottom: 1px solid #e0e0e0;
        }

        .comparison-table th {
            background: #667eea;
            color: white;
            font-weight: 600;
        }

        .back-link {
            display: inline-block;
            margin-top: 20px;
            color: #667eea;
            text-decoration: none;
            font-weight: 600;
            transition: color 0.3s ease;
        }

        .back-link:hover {
            color: #764ba2;
        }

        .tips {
            background: #e8f4fd;
            padding: 20px;
            border-radius: 10px;
            margin-top: 20px;
        }

        .tips h4 {
            color: #667eea;
            margin-bottom: 10px;
        }

        .tips ul {
            list-style: none;
            padding-left: 0;
        }

        .tips li {
            margin-bottom: 8px;
            padding-left: 20px;
            position: relative;
        }

        .tips li:before {
            content: "•";
            color: #667eea;
            font-weight: bold;
            position: absolute;
            left: 0;
        }

        @media (max-width: 600px) {
            .header h1 {
                font-size: 2em;
            }
            
            .mode-selector {
                flex-direction: column;
            }
            
            .mode-btn {
                text-align: center;
            }
        }