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

        /* Framework handles base styling */
        }

        .header p {
            font-size: 1.2em;
            opacity: 0.9;
        }

        .nav {
            background: #f8f9fa;
            padding: 15px 30px;
            border-bottom: 1px solid #e9ecef;
        }

        .nav a {
            color: #667eea;
            text-decoration: none;
            margin-right: 20px;
            font-weight: 500;
        }

        .nav a:hover {
            text-decoration: underline;
        }

        .back-link {
            display: inline-block;
            margin-top: 20px;
            color: #667eea;
            text-decoration: none;
            font-weight: 500;
        }

        .back-link:hover {
            text-decoration: underline;
        }

        .content {
            padding: 30px;
        }

        .calculator-section {
            margin-bottom: 40px;
            padding: 25px;
            border: 1px solid #e9ecef;
            border-radius: 15px;
            background: #f8f9fa;
        }

        .calculator-section h2 {
            color: #333;
            margin-bottom: 20px;
            font-size: 1.5em;
            border-bottom: 2px solid #667eea;
            padding-bottom: 10px;
        }

        .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 #ddd;
            border-radius: 8px;
            font-size: 16px;
            transition: border-color 0.3s;
        }

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

        .button-group {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }

        .btn {
            padding: 12px 24px;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            flex: 1;
            min-width: 120px;
        }

        .btn-primary {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
        }

        .btn-secondary {
            background: #6c757d;
            color: white;
        }

        .btn-secondary:hover {
            background: #5a6268;
        }

        .result {
            margin-top: 20px;
            padding: 20px;
            background: white;
            border-radius: 10px;
            border-left: 4px solid #667eea;
            display: none;
        }

        .result.show {
            display: block;
        }

        .result h3 {
            color: #333;
            margin-bottom: 15px;
        }

        .result-value {
            font-size: 1.5em;
            font-weight: bold;
            color: #667eea;
            margin: 10px 0;
        }

        .color-band {
            display: flex;
            gap: 5px;
            margin: 15px 0;
            justify-content: center;
        }

        .band {
            width: 30px;
            height: 60px;
            border-radius: 5px;
            border: 2px solid #333;
        }

        .resistor-display {
            background: #f8f9fa;
            padding: 20px;
            border-radius: 10px;
            text-align: center;
            margin: 15px 0;
        }

        .resistor-body {
            width: 200px;
            height: 40px;
            background: #d4af37;
            margin: 20px auto;
            border-radius: 20px;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 10px;
        }

        .resistor-wire {
            width: 30px;
            height: 4px;
            background: #333;
        }

        .resistor-bands {
            display: flex;
            gap: 2px;
            height: 100%;
        }

        .resistor-band {
            width: 15px;
            border-radius: 2px;
        }

        .formula {
            background: #e9ecef;
            padding: 15px;
            border-radius: 8px;
            font-family: 'Courier New', monospace;
            margin: 15px 0;
            border-left: 4px solid #667eea;
        }

        .error {
            color: #dc3545;
            background: #f8d7da;
            padding: 10px;
            border-radius: 5px;
            margin: 10px 0;
            display: none;
        }

        .info-box {
            background: #d1ecf1;
            border: 1px solid #bee5eb;
            color: #0c5460;
            padding: 15px;
            border-radius: 8px;
            margin: 15px 0;
        }

        @media (max-width: 768px) {
            .header h1 {
                font-size: 2em;
            }
            
            .content {
                padding: 20px;
            }
            
            .button-group {
                flex-direction: column;
            }
            
            .btn {
                flex: none;
            }
        }

        /* Cross-linking styles removed: using shared system + framework styles */