:root {
            --primary-color: #4a90e2;
            --secondary-color: #ff6b24;
            --text-dark: #333;
            --text-light: #666;
            --border-color: #ddd;
            --bg-light: #f8f9fa;
        }

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

        body {
            font-family: Arial, sans-serif;
            line-height: 1.6;
            color: var(--text-dark);
            background-color: #fff4eb;
        }

        /* Header & Navigation */
        header {
            background: var(--primary-color);
            color: white;
            padding: 1rem;
            text-align: center;
        }

        h1 {
            margin: 0;
            font-size: 2rem;
        }

        .link {
            font-weight: bold;
            color: #ffffff;
        }

        /* Main Container */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }

        /* Calculator Section */
        .calculator-section {
            background: white;
            border-radius: 8px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.1);
            padding: 30px;
            margin: 20px 0;
        }

        .calculator-header {
            text-align: center;
            margin-bottom: 30px;
        }

        .calculator-header h1 {
            color: var(--primary-color);
            font-size: 2.5em;
            margin-bottom: 10px;
        }

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

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: bold;
            color: var(--text-dark);
        }

        .form-group input {
            width: 100%;
            padding: 12px;
            border: 1px solid var(--border-color);
            border-radius: 4px;
            font-size: 16px;
        }

        .calculate-btn {
            background-color: var(--primary-color);
            color: white;
            padding: 15px 30px;
            border: none;
            border-radius: 4px;
            font-size: 18px;
            cursor: pointer;
            width: 100%;
            transition: background-color 0.3s;
        }

        .calculate-btn:hover {
            background-color: #e85d1a;
        }

        /* Results Section */
        .result-section {
            display: none;
            background: white;
            border-radius: 8px;
            padding: 20px;
            margin-top: 20px;
        }

        .number-card {
            background: var(--bg-light);
            border-radius: 8px;
            padding: 20px;
            margin-bottom: 20px;
        }

        .number-title {
            color: var(--primary-color);
            font-size: 1.5em;
            margin-bottom: 10px;
        }

        /* Content Sections */
        .content-section {
            background: white;
            border-radius: 8px;
            padding: 30px;
            margin: 20px 0;
        }

        .content-section h2 {
            color: var(--primary-color);
            margin-bottom: 20px;
        }

        .content-section p {
            margin-bottom: 15px;
            color: var(--text-light);
        }

        .number-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin-top: 20px;
        }

        .number-info {
            background: var(--bg-light);
            padding: 20px;
            border-radius: 8px;
        }

        /* Footer */
        footer {
            background: white;
            padding: 30px 0;
            margin-top: 40px;
            text-align: center;
            color: var(--text-light);
        }

        @media (max-width: 768px) {
            .nav-container {
                flex-direction: column;
                text-align: center;
            }

            .nav-links {
                margin-top: 15px;
            }

            .nav-links a {
                display: block;
                margin: 10px 0;
            }

            .calculator-section {
                padding: 20px;
            }

            .calculator-header h1 {
                font-size: 2em;
            }
        }