@import url('https://fonts.googleapis.com/css2?family=Comfortaa:wght@400;600;700&display=swap');

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

body {
    font-family: 'Comfortaa', sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f9f9f9;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
    background: white;
    min-height: 100vh;
}

/* Header / Intro */
.header {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: 2rem;
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid #eee;
}

.header img {
    width: 140px;
    height: 140px;
    border-radius: 8px;
    object-fit: cover;
}

.header-content h1 {
    font-size: 1.8rem;
    margin-bottom: 0.25rem;
}

.header-content .title {
    font-size: 0.95rem;
    color: #666;
    margin-bottom: 1rem;
}

.header-content p {
    font-size: 0.95rem;
    color: #555;
    margin-bottom: 1rem;
}

.header-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    font-size: 0.9rem;
}

.header-links a {
    color: #0066cc;
    text-decoration: none;
    border-bottom: 1px solid #0066cc;
}

.header-links a:hover {
    color: #004499;
}

/* Sections */
section {
    margin-bottom: 2.5rem;
}

section h2 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #222;
    font-weight: 600;
}

/* Teaching */
.course {
    margin-bottom: 1.2rem;
    padding: 1rem;
    background: #f5f5f5;
    border-radius: 6px;
    border-left: 3px solid #0066cc;
}

.course-title {
    font-weight: 600;
    color: #222;
}

.course-meta {
    font-size: 0.9rem;
    color: #666;
    margin-top: 0.25rem;
}

.course-links {
    margin-top: 0.75rem;
    font-size: 0.9rem;
}

.course-links a {
    color: #0066cc;
    text-decoration: none;
}

.course-links a:hover {
    text-decoration: underline;
}

/* Office hours */
.office-hours {
    padding: 1rem;
    background: #f0f7ff;
    border-radius: 6px;
    border-left: 3px solid #0066cc;
}

.office-hours p {
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.office-hours strong {
    color: #0066cc;
}

/* Thesis topics */
.thesis-topic {
    margin-bottom: 1rem;
    padding: 0.75rem;
    background: #fffaf0;
    border-radius: 6px;
    border-left: 3px solid #ff9500;
}

.thesis-topic-title {
    font-weight: 600;
    color: #222;
}

.thesis-topic-desc {
    font-size: 0.9rem;
    color: #666;
    margin-top: 0.25rem;
}

/* Footer */
footer {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid #eee;
    font-size: 0.85rem;
    color: #999;
    text-align: center;
}

/* Language toggle */
.lang-toggle {
    position: fixed;
    top: 1rem;
    right: 1rem;
    display: flex;
    gap: 0.5rem;
    z-index: 100;
}

.lang-btn {
    padding: 0.4rem 0.8rem;
    font-family: 'Comfortaa', sans-serif;
    font-size: 0.9rem;
    font-weight: 600;
    border: 1px solid #ddd;
    background: white;
    color: #666;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
}

.lang-btn.active {
    background: #0066cc;
    color: white;
    border-color: #0066cc;
}

.lang-btn:hover {
    border-color: #0066cc;
    color: #0066cc;
}

/* Responsive */
@media (max-width: 768px) {
    .header {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .header img {
        width: 100px;
        height: 100px;
    }
    
    .lang-toggle {
        top: 0.5rem;
        right: 0.5rem;
    }
    
    .container {
        padding: 1.5rem 1rem;
    }
}