body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 20px;
            line-height: 1.6;
            background: #060929;
            min-height: 100vh;
            box-sizing: border-box;
        }
        .container {
            max-width: 800px;
            margin: 0 auto;
            width: 100%;
        }
        h1 {
            color: #fff;
            text-align: center;
            margin-bottom: 20px;
            font-size: clamp(1.8rem, 4vw, 2.5rem);
        }
        
        h3 {
            color: #fff;
            margin-top: 0;
            margin-bottom: 15px;
            font-size: 1.2rem;
        }
        .calculator {
            border: 1px solid #f5d87a;
            border-radius: 8px;
            padding: 20px;
            margin-bottom: 20px;
            background: rgba(255, 255, 255, 0.05);
        }
        .date-input {
            display: flex;
            flex-direction: row;
            gap: 10px;
            margin-bottom: 20px;
            
        }
        select, input {
            padding: 12px;
            border: 1px solid #ddd;
            border-radius: 6px;
            font-size: 16px;
            flex: 1;
            min-width: 120px;
            background: #fff;
            box-sizing: border-box;
        }
        .button-group {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }
        button {
            background-color: #f5d87a;
            color: #05031c;
            padding: 12px 20px;
            border: none;
            border-radius: 6px;
            cursor: pointer;
            font-size: 16px;
            font-weight: bold;
            transition: all 0.3s ease;
            flex: 1;
            min-width: 150px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }
        button:hover {
            background-color: #f3d05b;
            transform: translateY(-2px);
        }
        .result {
            margin-top: 20px;
            padding: 20px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 8px;
            color: #fff;
        }
        .result p {
            margin: 10px 0;
        }
        .result strong {
            color: #f5d87a;
        }
        .note {
            font-size: 14px;
            color: #666;
            margin-top: 20px;
        }
        .ad-container {
            margin: 20px 0;
            padding: 10px;
            background-color: rgba(255, 255, 255, 0.1);
            border-radius: 8px;
            text-align: center;
            min-height: 100px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .back-button {
            background-color: #444;
            color: white;
            display: none;
        }
        .back-button:hover {
            background-color: #555;
        }
        .milestone {
            margin-top: 20px;
            padding: 20px;
            background: rgba(245, 216, 122, 0.2);
            border-radius: 8px;
            color: #fff;
        }
        .milestone h4 {
            margin-top: 0;
            color: #f5d87a;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .milestone p {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 0;
        }
        .copyright {
            font-size: 0.9rem;
            opacity: 0.7;
            color: #fff;
            text-align: center;
            margin-top: 20px;
            padding: 10px;
        }

        @media (max-width: 600px) {
.date-input {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
    
}
            select, input {
                width: 100%;
                min-width: auto;
            }
            .button-group {
                flex-direction: column;
            }
            button {
                width: 100%;
            }
            .calculator {
                padding: 15px;
            }
            body {
                padding: 15px;
            }
        }