body {
    margin: 0;
    padding: 0;
    background: #ffffff;
    color: #222222;
    font-family: "Source Serif 4", Georgia, "Times New Roman", serif;
    font-size: 18px;
    line-height: 1.75;
}

.site-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.6rem 3rem;
    border-bottom: 1px solid #e5e5e5;
}

.site-title {
    color: #222222;
    text-decoration: none;
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.site-nav a {
    color: #222222;
    text-decoration: none;
    margin-left: 2rem;
    font-size: 1rem;
}

.site-nav a:hover {
    color: #ba0c2f;
}

.site-main {
    max-width: 900px;
    margin: 5rem auto;
    padding: 0 2rem;
}

h1 {
    font-size: 3.2rem;
    font-weight: 500;
    margin-bottom: 2rem;
    line-height: 1.15;
}

h2 {
    margin-top: 3rem;
    margin-bottom: 1rem;
    font-size: 1.6rem;
}

a {
    color: #ba0c2f;
}

a:hover {
    opacity: 0.8;
}

.home-intro {
    display: flex;
    align-items: flex-start;
    gap: 3rem;
}

.home-text {
    flex: 1;
}

.home-photo img {
    width: 200px;
    height: auto;
    display: block;
}

@media (max-width: 700px) {
    body {
        font-size: 17px;
        line-height: 1.65;
    }

    .site-header {
        display: block;
        padding: 1.25rem 1.5rem;
    }

    .site-title {
        display: block;
        margin-bottom: 1rem;
    }

    .site-nav a {
        display: inline-block;
        margin: 0 1rem 0.5rem 0;
        font-size: 1rem;
    }

    .site-main {
        margin: 3rem auto;
        padding: 0 1.5rem;
    }

    .home-intro {
        display: block;
    }

    .home-photo {
        margin: 2rem 0;
    }

    .home-photo img {
        width: 100%;
        max-width: 260px;
    }

    h1 {
        font-size: 2.6rem;
    }
}

.affiliation {
    font-style: italic;
    color: #666666;
    margin-top: 2rem;
}

.site-footer {
    border-top: 1px solid #e5e5e5;
    margin: 5rem auto 0;
    padding: 2rem;
    text-align: center;
    color: #666666;
    font-size: 0.9rem;
}

.social-links {
    margin-bottom: 1rem;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin: 0 0.35rem;
    width: 2rem;
    height: 2rem;
    border: 1px solid #d6d6d6;
    border-radius: 50%;
    color: #222222;
    text-decoration: none;
}

.social-links a:hover {
    border-color: #ba0c2f;
    color: #ba0c2f;
    opacity: 1;
}

.copyright {
    margin: 0;
}

.language-switch {
    margin-left: 2rem;
    font-size: 0.95rem;
    color: #666666;
}

.language-switch a {
    margin-left: 0;
}