/* Wider, more breathable layout */
.content main {
    max-width: 700px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* More space between paragraphs */
.content main p {
    margin-bottom: 1.6em;
    line-height: 1.9;
    font-size: 1.1rem;
}

/* Section breaks (---) get big breathing room */
.content main hr {
    margin: 3.5rem auto;
    border: none;
    border-top: 1px solid rgba(128, 128, 128, 0.2);
    width: 40%;
}

/* Chapter titles */
.content main h1 {
    margin-bottom: 2.5rem;
    font-size: 2rem;
    letter-spacing: -0.02em;
}

/* Subheadings within chapters */
.content main h2 {
    margin-top: 3rem;
    margin-bottom: 1.5rem;
}

/* Blockquotes stand out more */
.content main blockquote {
    margin: 2.5rem 0;
    padding: 1rem 1.5rem;
    border-left: 3px solid rgba(128, 128, 128, 0.4);
    font-style: italic;
}

/* Lists breathe */
.content main li {
    margin-bottom: 0.8em;
    line-height: 1.8;
}

/* Nav buttons bigger and clearer */
.nav-chapters {
    font-size: 1.2rem;
    padding: 1rem;
}