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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: #f5f5f5;
    color: #333;
}

header {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 20px 0;
    text-align: center;
}

.site-title {
    font-size: 1.8em;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 5px;
}

.site-credentials {
    font-size: 0.85em;
    color: #888;
    margin-bottom: 10px;
}

.site-subtitle {
    font-size: 0.95em;
    color: #666;
    margin-bottom: 8px;
}

.site-affiliation {
    font-size: 0.85em;
    color: #888;
    margin-bottom: 15px;
}

.header-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
}

.header-link {
    color: #666;
    text-decoration: none;
    font-size: 0.9em;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: color 0.2s;
}

.header-link:hover {
    color: #2c3e50;
}

.header-link.linkedin:hover {
    color: #0077b5;
}

nav {
    display: flex;
    justify-content: center;
    gap: 10px;
}

.tab-button {
    padding: 12px 24px;
    border: none;
    background-color: #e0e0e0;
    color: #333;
    font-size: 16px;
    cursor: pointer;
    border-radius: 8px 8px 0 0;
    transition: background-color 0.3s, color 0.3s;
}

.tab-button:hover {
    background-color: #d0d0d0;
}

.tab-button.active {
    background-color: #2c3e50;
    color: #fff;
}

main {
    flex: 1;
    padding: 40px 20px;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.tab-content h2 {
    margin-bottom: 20px;
    color: #2c3e50;
}

.tab-content p {
    line-height: 1.6;
    color: #666;
}

footer {
    background-color: #2c3e50;
    color: #fff;
    text-align: center;
    padding: 20px;
    margin-top: auto;
}

/* Photo Gallery Styles */
.gallery-section {
    margin-bottom: 40px;
}

.gallery-section h3 {
    color: #2c3e50;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #e0e0e0;
}

.photo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 4px;
}

.photo-item {
    aspect-ratio: 1;
    overflow: hidden;
    cursor: pointer;
    position: relative;
}

.photo-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.photo-item:hover img {
    transform: scale(1.05);
}

.photo-date {
    position: absolute;
    bottom: 8px;
    left: 8px;
    background: rgba(0,0,0,0.7);
    color: #fff;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 11px;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.photo-item:hover .photo-date {
    opacity: 1;
}

.photo-item::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0);
    transition: background 0.3s ease;
}

.photo-item:hover::after {
    background: rgba(0,0,0,0.1);
}

/* Lightbox Styles */
.lightbox {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.95);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.lightbox.active {
    display: flex;
}

.lightbox img {
    max-width: 90vw;
    max-height: 80vh;
    object-fit: contain;
}

.lightbox-info {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: #fff;
    max-width: 80%;
}

.lightbox-caption {
    font-size: 16px;
    margin-bottom: 5px;
}

.lightbox-date {
    font-size: 13px;
    color: #aaa;
}

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 30px;
    color: #fff;
    font-size: 40px;
    cursor: pointer;
    z-index: 1001;
    line-height: 1;
}

.lightbox-close:hover {
    color: #ccc;
}

.lightbox-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    color: #fff;
    font-size: 50px;
    cursor: pointer;
    padding: 20px;
    user-select: none;
}

.lightbox-nav:hover {
    color: #ccc;
}

.lightbox-prev {
    left: 10px;
}

.lightbox-next {
    right: 10px;
}

.gallery-empty {
    color: #999;
    font-style: italic;
    padding: 40px;
    text-align: center;
    background: #f0f0f0;
    border-radius: 8px;
}

/* Publications Styles */
.publication-list {
    list-style: none;
}

.publication-item {
    padding: 20px;
    margin-bottom: 15px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    border-left: 4px solid #2c3e50;
}

.publication-item:hover {
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.publication-title {
    font-size: 16px;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 8px;
    line-height: 1.4;
}

.publication-title a {
    color: inherit;
    text-decoration: none;
}

.publication-title a:hover {
    color: #4285f4;
}

.publication-authors {
    font-size: 14px;
    color: #666;
    margin-bottom: 6px;
}

.publication-venue {
    font-size: 13px;
    color: #888;
    font-style: italic;
}

.publication-year {
    display: inline-block;
    background: #2c3e50;
    color: #fff;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 12px;
    margin-left: 10px;
}

.publication-type {
    display: inline-block;
    background: #e8f4f8;
    color: #2980b9;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 11px;
    margin-left: 5px;
}

.publication-abstract {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid #eee;
    font-size: 13px;
    line-height: 1.6;
    color: #555;
}

.publication-citations {
    display: inline-block;
    background: #27ae60;
    color: #fff;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 11px;
    margin-left: 5px;
}

.citation-note {
    font-size: 12px;
    color: #888;
    margin-bottom: 15px;
    font-style: italic;
}

/* Profile Links Box */
.profile-links-box {
    margin-top: 30px;
    padding: 25px;
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    border-radius: 12px;
    text-align: center;
    color: #fff;
}

.profile-links-box h3 {
    margin-bottom: 10px;
    font-size: 18px;
    font-weight: 500;
}

.profile-links-box p {
    margin-bottom: 20px;
    color: #bdc3c7;
    font-size: 14px;
}

.profile-links {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

.profile-link-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 24px;
    background: #fff;
    color: #2c3e50;
    text-decoration: none;
    border-radius: 25px;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.3s ease;
}

.profile-link-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}

.profile-link-btn.scholar {
    background: #4285f4;
    color: #fff;
}

.profile-link-btn.scholar:hover {
    background: #3367d6;
}

.profile-link-btn.pure {
    background: #e74c3c;
    color: #fff;
}

.profile-link-btn.pure:hover {
    background: #c0392b;
}

/* GitHub Repos Styles */
.repos-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 10px;
}

.repos-header h2 {
    margin-bottom: 0;
}

.github-profile-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: #333;
    text-decoration: none;
    font-size: 14px;
    padding: 8px 16px;
    border: 1px solid #333;
    border-radius: 20px;
    transition: all 0.3s ease;
}

.github-profile-link:hover {
    background-color: currentColor;
    color: #fff;
}

.github-profile-link:hover svg {
    fill: #fff;
}

.repo-list {
    display: grid;
    gap: 20px;
}

.repo-card {
    background: #fff;
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    border-left: 4px solid #2c3e50;
    transition: all 0.3s ease;
}

.repo-card:hover {
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
    transform: translateY(-2px);
}

.repo-card h3 {
    margin: 0 0 10px 0;
    font-size: 18px;
}

.repo-card h3 a {
    color: #2c3e50;
    text-decoration: none;
}

.repo-card h3 a:hover {
    color: #4285f4;
}

.repo-website-link {
    display: inline-block;
    margin-left: 10px;
    padding: 2px 8px;
    font-size: 12px;
    font-weight: 500;
    color: #4285f4;
    border: 1px solid #4285f4;
    border-radius: 4px;
    text-decoration: none;
    vertical-align: middle;
    transition: background 0.2s, color 0.2s;
}

.repo-website-link:hover {
    background: #4285f4;
    color: #fff;
}

.repo-description {
    color: #666;
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 15px;
}

.repo-meta {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    font-size: 13px;
    color: #888;
}

.repo-meta span {
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.repo-lang {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.repo-lang.python { background-color: #3572A5; }
.repo-lang.cpp { background-color: #f34b7d; }
.repo-lang.html { background-color: #e34c26; }
.repo-lang.swift { background-color: #F05138; }
.repo-lang.csharp { background-color: #178600; }

/* Mobile responsive styles */
@media (max-width: 600px) {
    nav {
        flex-wrap: wrap;
        padding: 0 10px;
    }

    .tab-button {
        padding: 10px 16px;
        font-size: 14px;
        flex: 1 1 45%;
        text-align: center;
    }

    header {
        padding: 15px 0;
    }

    main {
        padding: 20px 15px;
    }

    .repos-header {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }

    .repos-header h2 {
        font-size: 1.5em;
    }

    .photo-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
    }

    .profile-links-box {
        padding: 15px;
    }

    .profile-links {
        flex-direction: column;
    }

    .profile-link-btn {
        width: 100%;
        justify-content: center;
    }
}