:root {
            --primary-color: #1a2639;
            --accent-color: #3e7cb1;
            --text-color: #2d3748;
            --background-color: #f7fafc;
            --card-background: #ffffff;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.05), 0 1px 3px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
        }

        body {
            background-color: var(--background-color);
            color: var(--text-color);
            line-height: 1.6;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
            font-size: 16px;
        }

        header {
            background-color: var(--primary-color);
            padding: 1.5rem;
            text-align: center;
        }

        header img {
            width: 80px;
            height: auto;
            margin-bottom: 0.5rem;
        }

        header h1 {
            color: #ffffff;
            font-size: 1.75rem;
            font-weight: 700;
            margin-bottom: 0.25rem;
        }

        header p {
            color: #e2e8f0;
            font-size: 0.9rem;
        }

        main {
            flex: 1;
            padding: 1.5rem;
            width: 100%;
            max-width: 900px;
            margin: 0 auto;
        }

        .intro-section {
            background: var(--card-background);
            padding: 1.5rem;
            border-radius: 12px;
            box-shadow: var(--shadow);
            margin-bottom: 1.5rem;
            text-align: center;
        }

        .intro-section h2 {
            font-size: 1.5rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }

        .intro-section p {
            margin-bottom: 1.5rem;
            color: var(--text-color);
        }

        .btn {
            display: inline-block;
            padding: 0.75rem 1.5rem;
            background-color: var(--accent-color);
            color: white;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 500;
            transition: var(--transition);
            margin: 0.5rem 0;
        }

        .btn:hover {
            background-color: #2b5e91;
            transform: translateY(-1px);
        }

        .btn-secondary {
            background-color: #718096;
        }

        .btn-secondary:hover {
            background-color: #4a5568;
        }

        .tool-section {
            background: var(--card-background);
            padding: 1.25rem;
            border-radius: 12px;
            box-shadow: var(--shadow);
            margin-bottom: 1.5rem;
            transition: var(--transition);
        }

        .example-tools {
            margin-top: 2rem;
        }

        .example-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1rem;
        }

        footer {
            background-color: var(--primary-color);
            color: #e2e8f0;
            text-align: center;
            padding: 1rem;
            font-size: 0.85rem;
        }

        footer a {
            color: var(--accent-color);
            text-decoration: none;
            font-weight: 500;
            transition: color var(--transition);
        }

        footer a:hover {
            color: #ffffff;
            text-decoration: underline;
        }

        /* Mobile-first media queries */
        @media (min-width: 768px) {
            header img {
                width: 100px;
            }

            header h1 {
                font-size: 2rem;
            }

            header p {
                font-size: 1rem;
            }

            main {
                padding: 2rem;
            }

            .tool-section {
                padding: 1.5rem;
            }

            .tool-section h2 {
                font-size: 1.5rem;
            }

            .tool-section p {
                font-size: 1rem;
            }

            textarea {
                height: 150px;
                font-size: 1rem;
            }

            .btn {
                padding: 0.75rem 2rem;
            }
        }