body {
    background-color: #ffffff;
    color: #000000;
    font-family: "Times New Roman", Times, "MS PMincho", "Hiragino Mincho ProN", serif;
    line-height: 1.8;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    border-bottom: 1px solid #000000;
    padding: 3rem 10%;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.logo-container {
    text-decoration: none;
    color: #000000;
}

.logo {
    font-size: 2.5rem;
    font-weight: normal;
    letter-spacing: 0.3rem;
    margin: 0;
}

.institute-name {
    font-size: 0.8rem;
    margin: 0.5rem 0 0 0;
    text-transform: uppercase;
    letter-spacing: 0.1rem;
}

.header-right {
    text-align: right;
}

nav {
    margin-top: 2rem;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 1.5rem;
}

nav a {
    text-decoration: none;
    color: #000000;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05rem;
}

nav a:hover {
    text-decoration: underline;
}

.lang-switcher {
    margin-bottom: 0.5rem;
}

.lang-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.75rem;
    padding: 0;
    margin-left: 1rem;
    text-decoration: none;
    border-bottom: 1px solid transparent;
}

.lang-btn:hover {
    border-bottom: 1px solid #000000;
}

main {
    flex: 1;
    padding: 5rem 10%;
    max-width: 900px;
    margin: 0 auto;
}

h1 {
    font-size: 2rem;
    font-weight: normal;
    margin-bottom: 3rem;
    border-bottom: 1px solid #eeeeee;
    padding-bottom: 1rem;
}

h2 {
    font-size: 1.5rem;
    font-weight: normal;
    margin-top: 4rem;
    margin-bottom: 1.5rem;
}

h3 {
    font-size: 1.1rem;
    font-weight: bold;
    margin-bottom: 1rem;
}

section {
    margin-bottom: 5rem;
}

footer {
    border-top: 1px solid #000000;
    padding: 3rem 10%;
    font-size: 0.75rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #444;
}

.footer-links a {
    color: #444;
    margin-left: 1.5rem;
    text-decoration: none;
}

.footer-links a:hover {
    color: #000;
    text-decoration: underline;
}

.hero {
    margin-bottom: 6rem;
    text-align: center;
}

.tagline {
    font-style: italic;
    font-size: 1.4rem;
    color: #333;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
}

.card {
    border-top: 1px solid #000000;
    padding-top: 1.5rem;
}

.card a {
    color: #000;
    text-decoration: none;
    font-size: 0.9rem;
}

.card a:hover {
    text-decoration: underline;
}

.publication-item {
    margin-bottom: 4rem;
    border-left: 1px solid #000000;
    padding-left: 2rem;
}

.doi {
    font-family: "Courier New", Courier, monospace;
    font-size: 0.8rem;
    color: #666;
    margin: 0.5rem 0;
}

/* Responsive */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        align-items: center;
        text-align: center;
        padding: 2rem 5%;
    }
    .header-right {
        text-align: center;
        width: 100%;
    }
    nav ul {
        justify-content: center;
        gap: 1rem;
    }
    main {
        padding: 3rem 5%;
    }
    .grid {
        gap: 2rem;
    }
    footer {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }
    .footer-links a {
        margin: 0 0.75rem;
    }
}