* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        body {
            background: linear-gradient(135deg, #f0f5ff, #e6f0ff);
            color: #333;
            line-height: 1.6;
            padding: 20px;
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        
        .container {
            max-width: 500px;
            width: 100%;
            background: white;
            border-radius: 20px;
            box-shadow: 0 15px 40px rgba(26, 42, 108, 0.15);
            overflow: hidden;
        }
        
        header {
            background: linear-gradient(to right, #1a2a6c, #2a4d69);
            color: white;
            text-align: center;
            padding: 30px 20px;
            position: relative;
        }
        
        .back-button {
            position: absolute;
            top: 20px;
            left: 20px;
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.9);
            text-decoration: none;
            transition: all 0.3s;
            padding: 8px 12px;
            border-radius: 30px;
            background: rgba(255, 255, 255, 0.15);
            z-index: 10;
        }
        
        .back-button:hover {
            background: rgba(255, 255, 255, 0.25);
            color: white;
        }
        
        .back-button svg {
            width: 18px;
            height: 18px;
        }
        
        header h1 {
            font-size: 2.2rem;
            margin-bottom: 10px;
            letter-spacing: 1px;
        }
        
        header p {
            font-size: 1.1rem;
            max-width: 400px;
            margin: 0 auto;
            opacity: 0.9;
        }
        
        .calculator-icon {
            position: absolute;
            top: 20px;
            right: 20px;
            background: rgba(255, 255, 255, 0.2);
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 1.5rem;
        }
        
        .content {
            padding: 30px;
        }
        
        .section-title {
            font-size: 1.4rem;
            margin-bottom: 25px;
            padding-bottom: 10px;
            border-bottom: 2px solid #4b86b4;
            color: #1a2a6c;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .input-group {
            margin-bottom: 20px;
        }
        
        .input-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            font-size: 1rem;
            color: #2a4d69;
        }
        
        .input-row {
            display: flex;
            gap: 15px;
        }
        
        .input-row .input-group {
            flex: 1;
        }
        
        .input-group input {
            width: 100%;
            padding: 14px;
            border: 2px solid #e0e7ff;
            border-radius: 10px;
            font-size: 1.1rem;
            transition: all 0.3s;
            background: #f8faff;
        }
        
        .input-group input:focus {
            border-color: #4b86b4;
            outline: none;
            box-shadow: 0 0 0 3px rgba(75, 134, 180, 0.15);
        }
        
        .btn-calculate {
            background: linear-gradient(to right, #1a2a6c, #2a4d69);
            color: white;
            border: none;
            padding: 16px;
            font-size: 1.2rem;
            border-radius: 10px;
            cursor: pointer;
            width: 100%;
            font-weight: 600;
            transition: all 0.3s;
            margin-top: 10px;
            box-shadow: 0 5px 15px rgba(26, 42, 108, 0.2);
        }
        
        .btn-calculate:hover {
            background: linear-gradient(to right, #2a4d69, #4b86b4);
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(26, 42, 108, 0.3);
        }
        
        .btn-calculate:active {
            transform: translateY(-1px);
        }
        
        .results {
            margin-top: 30px;
            background: #f0f8ff;
            border-radius: 15px;
            padding: 25px;
            border-left: 5px solid #1a2a6c;
        }
        
        .result-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
            border-bottom: 1px solid #d6e4ff;
        }
        
        .result-item:last-child {
            border-bottom: none;
        }
        
        .result-label {
            font-weight: 600;
            color: #2a4d69;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .result-value {
            font-weight: 700;
            font-size: 1.4rem;
            color: #1a2a6c;
            text-align: right;
        }
        
        .highlight {
            background: linear-gradient(to right, #1a2a6c, #2a4d69);
            color: white;
            padding: 25px;
            text-align: center;
            border-radius: 15px;
            margin-top: 20px;
        }
        
        .highlight h3 {
            font-size: 1.8rem;
            margin-bottom: 10px;
        }
        
        .highlight p {
            font-size: 1.4rem;
            font-weight: 700;
            letter-spacing: 1px;
        }
        
        .footer {
            text-align: center;
            padding: 20px;
            color: #666;
            font-size: 0.9rem;
            background: #f5f7fa;
            border-top: 1px solid #eaeff5;
        }
        
        @media (max-width: 480px) {
            header h1 {
                font-size: 1.8rem;
            }
            
            .input-row {
                flex-direction: column;
                gap: 0;
            }
            
            .result-value {
                font-size: 1.2rem;
            }
            
            .highlight h3 {
                font-size: 1.5rem;
            }
            
            .highlight p {
                font-size: 1.2rem;
            }
            
            .back-button {
                top: 15px;
                left: 15px;
                font-size: 0.8rem;
                padding: 6px 10px;
            }
        }