body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    margin: 2em auto;
    padding: 0 2em;
    line-height: 1.5;
    font-size: 16px;
    max-width: 50em;
}

/* Tier 1: Wide layout - main on left, nav on right */
.container {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 2em;
}

main {
    flex: 1;
    max-width: 28em;
}

nav {
    flex-shrink: 0;
}

/* Tier 2: Narrow layout - nav horizontal at top */
@media (max-width: 900px) {
    .container {
        flex-direction: column;
    }

    main {
        max-width: none;
        order: 2;
    }

    nav {
        order: 1;
        width: 100%;
    }

    nav ul {
        display: flex;
        flex-wrap: wrap;
        gap: 0.5em 1em;
    }

    nav li {
        display: inline;
        margin-bottom: 0;
    }
}

/* Tier 3: Ultra-narrow layout - links stacked, photo on bottom */
@media (max-width: 600px) {
    nav ul {
        flex-direction: column;
        gap: 0.5em;
    }

    nav li {
        display: block;
    }

    main {
        display: flex;
        flex-direction: column;
    }

    .profile-photo {
        order: 1;
        margin-top: 1em;
    }
}

h1 {
    font-size: 1.5em;
    font-weight: normal;
    margin: 0;
}

h2 {
    font-size: 1.2em;
    font-weight: normal;
    margin-top: 2em;
    margin-bottom: 0.5em;
}

h3 {
    font-size: 1em;
    font-weight: normal;
    margin: 1em 0 0.3em 0;
}

a {
    color: #00e;
    text-decoration: none;
}

a:visited {
    color: #551a8b;
}

a:hover {
    text-decoration: underline;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    text-align: right;
}

nav li {
    display: block;
    margin-bottom: 0.3em;
}

.profile-photo {
    max-width: 200px;
    margin: 1em 0;
}

img, video {
    max-width: 100%;
    height: auto;
}

p {
    margin: 0.5em 0;
}

.meta {
    color: #666;
    font-size: 0.9em;
}