/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

/* Navigation */
.navbar {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-brand a {
    font-size: 1.5rem;
    font-weight: 600;
    color: #333;
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-link {
    color: #666;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: #007bff;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: 0.3s;
}

/* Main Container */
.main-container {
    display: flex;
    max-width: 1200px;
    margin: 90px auto 0;
    padding: 20px;
    gap: 40px;
}

/* Sidebar Profile */
.sidebar {
    width: 280px;
    position: sticky;
    top: 110px;
    height: fit-content;
}

.profile-card {
    background: #fff;
    border-radius: 15px;
    padding: 30px 25px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    text-align: center;
}

.profile-image {
    width: 150px;
    height: 150px;
    margin: 0 auto 20px;
    position: relative;
}

.profile-image img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid #f8f9fa;
}

.profile-name {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 5px;
    color: #333;
}

.profile-title {
    color: #666;
    margin-bottom: 10px;
    font-size: 0.95rem;
}

.profile-location {
    color: #888;
    font-size: 0.9rem;
    margin-bottom: 25px;
}

.profile-location i {
    margin-right: 5px;
}

.contact-info {
    margin-bottom: 25px;
}

.contact-item {
    display: flex;
    align-items: center;
    margin-bottom: 12px;
    padding: 8px 0;
}

.contact-item i {
    width: 20px;
    color: #007bff;
    margin-right: 12px;
}

.contact-item a {
    color: #666;
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.contact-item a:hover {
    color: #007bff;
}

.resume-section {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.resume-btn {
    background: #007bff;
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.resume-btn:hover {
    background: #0056b3;
    transform: translateY(-2px);
}

.resume-btn.download {
    background: #28a745;
}

.resume-btn.download:hover {
    background: #1e7e34;
}

/* Main Content */
.content {
    flex: 1;
    background: #fff;
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

.section {
    margin-bottom: 50px;
}

.section h1, .section h2 {
    color: #333;
    margin-bottom: 20px;
    font-weight: 600;
}

.section h1 {
    font-size: 2.5rem;
}

.section h2 {
    font-size: 2rem;
    border-bottom: 2px solid #f0f0f0;
    padding-bottom: 10px;
}

.intro-text {
    font-size: 1.1rem;
    color: #555;
    margin-bottom: 20px;
    line-height: 1.8;
}

.section-subtitle {
    color: #666;
    margin-bottom: 25px;
}

.google-scholar-link {
    color: #007bff;
    text-decoration: none;
}

.google-scholar-link:hover {
    text-decoration: underline;
}

/* Publications */
.year-group {
    margin-bottom: 40px;
}

.year-group h3 {
    font-size: 1.5rem;
    color: #333;
    margin-bottom: 20px;
    font-weight: 600;
}

.publications-list {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.publication-item {
    display: flex;
    gap: 20px;
    padding: 25px;
    background: #f8f9fa;
    border-radius: 12px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.publication-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.publication-content {
    flex: 1;
}

.authors {
    margin-bottom: 8px;
    line-height: 1.5;
}

.authors strong {
    font-weight: 600;
}

.paper-title {
    font-weight: 600;
    color: #333;
    margin-bottom: 8px;
    font-size: 1.05rem;
}

.venue {
    color: #666;
    margin-bottom: 15px;
    font-style: italic;
}

.conference-rank {
    color: #28a745;
    font-weight: 500;
}

.publication-links {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.pub-link {
    padding: 6px 12px;
    border-radius: 6px;
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.pub-link.paper {
    background: #007bff;
    color: white;
}

.pub-link.website {
    background: #28a745;
    color: white;
}

.pub-link.code {
    background: #6c757d;
    color: white;
}

.pub-link.video {
    background: #dc3545;
    color: white;
}

.pub-link.arxiv {
    background: #ff6b35;
    color: white;
}

.pub-link:hover {
    transform: translateY(-1px);
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

.publication-image {
    width: 120px;
    /* height: 90px; */
    flex-shrink: 0;
}

.publication-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.3s ease;
}

.publication-image img:hover {
    transform: scale(1.05);
}

/* Timeline */
.timeline {
    position: relative;
    padding-left: 30px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: #007bff;
}

.timeline-item {
    position: relative;
    margin-bottom: 30px;
    padding-left: 40px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 8px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #007bff;
}

.timeline-date {
    color: #007bff;
    font-weight: 600;
    margin-bottom: 5px;
}

.timeline-content h3 {
    color: #333;
    margin-bottom: 5px;
}

.timeline-content h4 {
    color: #666;
    font-weight: 500;
    margin-bottom: 10px;
}

/* Projects */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
}

.project-card {
    background: #f8f9fa;
    border-radius: 12px;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.project-image {
    height: 200px;
    overflow: hidden;
}

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

.project-card:hover .project-image img {
    transform: scale(1.1);
}

.project-content {
    padding: 20px;
}

.project-content h3 {
    color: #333;
    margin-bottom: 10px;
    font-weight: 600;
}

.project-content p {
    color: #666;
    margin-bottom: 15px;
    line-height: 1.6;
}

.project-links {
    display: flex;
    gap: 10px;
}

.project-link {
    padding: 8px 15px;
    background: #007bff;
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 5px;
}

.project-link:hover {
    background: #0056b3;
    transform: translateY(-1px);
}

/* Achievements */
.achievements-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.achievement-item {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 12px;
    transition: transform 0.3s ease;
}

.achievement-item:hover {
    transform: translateX(5px);
}

.achievement-item i {
    font-size: 2rem;
    color: #ffc107;
    width: 60px;
    text-align: center;
}

.achievement-item h3 {
    color: #333;
    margin-bottom: 5px;
}

.achievement-item p {
    color: #666;
}

/* Contact */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.contact-info-detailed h3 {
    color: #333;
    margin-bottom: 15px;
}

.contact-info-detailed p {
    color: #666;
    margin-bottom: 25px;
    line-height: 1.6;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.contact-detail {
    display: flex;
    align-items: center;
    gap: 15px;
}

.contact-detail i {
    width: 20px;
    color: #007bff;
}

.contact-form form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.contact-form input,
.contact-form textarea {
    padding: 12px 15px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
    font-family: 'Inter', sans-serif;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: #007bff;
}

.contact-form button {
    background: #007bff;
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.contact-form button:hover {
    background: #0056b3;
    transform: translateY(-2px);
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.8);
}

.modal-content {
    position: relative;
    margin: 5% auto;
    width: 90%;
    max-width: 800px;
    height: 80vh;
    background: white;
    border-radius: 10px;
    overflow: hidden;
}

.modal-content iframe {
    width: 100%;
    height: calc(100% - 40px);
    border: none;
}

.modal-content img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: #f8f9fa;
}

.close {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 28px;
    font-weight: bold;
    color: #333;
    cursor: pointer;
    z-index: 2001;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.9);
    border-radius: 50%;
}

.close:hover {
    background: rgba(255,255,255,1);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        transition: left 0.3s ease;
    }

    .nav-menu.active {
        left: 0;
    }

    .main-container {
        flex-direction: column;
        margin-top: 90px;
        padding: 15px;
        gap: 20px;
    }

    .sidebar {
        width: 100%;
        position: static;
    }

    .content {
        padding: 25px 20px;
    }

    .section h1 {
        font-size: 2rem;
    }

    .section h2 {
        font-size: 1.5rem;
    }

    .publication-item {
        flex-direction: column;
        text-align: center;
    }

    .publication-image {
        width: 100%;
        height: 200px;
        align-self: center;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 25px;
    }

    .modal-content {
        width: 95%;
        height: 70vh;
        margin: 10% auto;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 0 15px;
    }

    .profile-card {
        padding: 20px 15px;
    }

    .content {
        padding: 20px 15px;
    }

    .section h1 {
        font-size: 1.75rem;
    }

    .section h2 {
        font-size: 1.3rem;
    }

    .publication-links {
        justify-content: center;
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Loading animation */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section {
    animation: fadeInUp 0.6s ease-out;
}