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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            line-height: 1.6;
            color: #111;
            background: #fafafa;
        }

        header {
            padding: 2rem;
            border-bottom: 1px solid #e5e5e5;
        }

        nav {
            max-width: 900px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        nav a {
            margin-left: 1rem;
            text-decoration: none;
            color: #111;
            font-weight: 500;
        }

        main {
            max-width: 900px;
            margin: 0 auto;
            padding: 4rem 2rem;
        }

        section {
            margin-bottom: 4rem;
        }

        h1 {
            font-size: 3rem;
            margin-bottom: 1rem;
        }

        h2 {
            margin-bottom: 0.5rem;
        }

        footer {
            border-top: 1px solid #e5e5e5;
            padding: 2rem;
            text-align: center;
            color: #666;
        }