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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #2c3e50;
    background-color: #ffffff;
    max-width: 720px;
    margin: 0 auto;
    padding: 60px 30px;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #e5e5e5;
}

nav .name {
    font-size: 1.2rem;
    font-weight: 600;
    color: #1a1a1a;
}

nav .nav-links a {
    margin-left: 2rem;
    font-size: 1rem;
    font-weight: 500;
}

h1 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 2rem;
    color: #1a1a1a;
}

h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-top: 3rem;
    margin-bottom: 1.5rem;
    color: #1a1a1a;
}

p {
    margin-bottom: 1rem;
    font-size: 1.05rem;
    color: #4a4a4a;
}

a {
    color: #0066cc;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-bottom 0.2s ease;
}

a:hover {
    border-bottom: 1px solid #0066cc;
}

.book-list {
    list-style: none;
    margin-bottom: 2rem;
}

.book-list li {
    margin-bottom: 1rem;
    padding-left: 0;
    font-size: 1.05rem;
    color: #4a4a4a;
}

.book-list li strong {
    color: #1a1a1a;
}

.section {
    margin-bottom: 2rem;
}

@media (max-width: 600px) {
    body {
        padding: 40px 20px;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.3rem;
    }

    nav {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    nav .nav-links a {
        margin-left: 0;
        margin-right: 1.5rem;
    }
}