* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
 
        :root {
            --primary-blue: #0062ff;
            --black: #000000;
            --white: #ffffff;
            --gray-100: #f5f5f5;
            --gray-200: #e5e5e5;
            --gray-600: #666666;
            --gray-800: #333333;
        }
 
        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
            background-color: var(--white);
            color: var(--gray-800);
            line-height: 1.7;
            font-size: 16px;
        }
 
        .container {
            max-width: 800px;
            margin: 0 auto;
            padding: 60px 24px;
        }
 
        header {
            margin-bottom: 48px;
            padding-bottom: 32px;
            border-bottom: 2px solid var(--primary-blue);
        }
 
        .site-name {
            font-family: 'Space Mono', monospace;
            font-size: 14px;
            font-weight: 700;
            color: var(--primary-blue);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 16px;
        }
 
        h1 {
            font-size: 42px;
            font-weight: 700;
            color: var(--black);
            margin-bottom: 20px;
            line-height: 1.2;
        }
 
        .meta-info {
            display: flex;
            gap: 24px;
            flex-wrap: wrap;
            font-size: 14px;
            color: var(--gray-600);
        }
 
        .meta-item {
            display: flex;
            align-items: center;
            gap: 8px;
        }
 
        .meta-label {
            font-weight: 600;
            color: var(--gray-800);
        }
 
        .reading-time {
            background: var(--gray-100);
            padding: 4px 12px;
            border-radius: 4px;
            font-weight: 500;
        }
 
        .intro-section {
            background: var(--gray-100);
            padding: 32px;
            border-radius: 8px;
            margin-bottom: 48px;
            border-left: 4px solid var(--primary-blue);
        }
 
        .intro-section p {
            font-size: 18px;
            font-weight: 500;
            color: var(--gray-800);
            line-height: 1.6;
        }
 
        section {
            margin-bottom: 48px;
        }
 
        h2 {
            font-size: 28px;
            font-weight: 700;
            color: var(--black);
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 12px;
        }
 
        h2::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 60px;
            height: 3px;
            background: var(--primary-blue);
        }
 
        h3 {
            font-size: 20px;
            font-weight: 600;
            color: var(--black);
            margin-top: 28px;
            margin-bottom: 16px;
        }
 
        p {
            margin-bottom: 16px;
            color: var(--gray-800);
        }
 
        ul {
            margin-left: 24px;
            margin-bottom: 16px;
        }
 
        li {
            margin-bottom: 12px;
            color: var(--gray-800);
        }
 
        .highlight-box {
            background: linear-gradient(135deg, #f0f7ff 0%, #e6f2ff 100%);
            border: 2px solid var(--primary-blue);
            padding: 24px;
            border-radius: 8px;
            margin: 24px 0;
        }
 
        .highlight-box p {
            margin-bottom: 0;
            font-weight: 500;
        }
 
        strong {
            color: var(--black);
            font-weight: 600;
        }
 
        .contact-section {
            background: var(--black);
            color: var(--white);
            padding: 40px;
            border-radius: 8px;
            margin-top: 60px;
        }
 
        .contact-section h2 {
            color: var(--white);
        }
 
        .contact-section h2::after {
            background: var(--primary-blue);
        }
 
        .contact-section p {
            color: var(--white);
        }
 
        .email-link {
            color: var(--primary-blue);
            text-decoration: none;
            font-weight: 600;
            transition: opacity 0.2s;
        }
 
        .email-link:hover {
            opacity: 0.8;
        }
 
        footer {
            margin-top: 60px;
            padding-top: 32px;
            border-top: 1px solid var(--gray-200);
            text-align: center;
            color: var(--gray-600);
            font-size: 14px;
        }
 
        @media (max-width: 768px) {
            .container {
                padding: 40px 20px;
            }
 
            h1 {
                font-size: 32px;
            }
 
            h2 {
                font-size: 24px;
            }
 
            .intro-section {
                padding: 24px;
            }
 
            .intro-section p {
                font-size: 16px;
            }
        }