/* Base Styles */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --light-color: #ecf0f1;
    --dark-color: #2c3e50;
    --text-color: #333;
    --text-light: #7f8c8d;
    --max-width: 1200px;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #f9f9f9;
}

a {
    text-decoration: none;
    color: var(--secondary-color);
}

/* Header & Navigation */
header {
    background-color: var(--primary-color);
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.main-nav {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1rem 2rem;
}

.main-nav ul {
    display: flex;
    list-style: none;
}

.main-nav li {
    margin-right: 1.5rem;
}

.main-nav a {
    color: white;
    font-weight: 500;
    transition: color 0.3s;
    padding: 0.5rem 0;
    position: relative;
}

.main-nav a:hover {
    color: var(--light-color);
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--light-color);
    transition: width 0.3s;
}

.main-nav a:hover::after {
    width: 100%;
}

.name-item a {
    font-weight: bold;
    font-size: 1.2rem;
}

/* Layout */
.container {
    display: flex;
    max-width: var(--max-width);
    margin: 2rem auto;
    padding: 0 0rem;
}

.sidebar {
    flex: 0 0 0px;
    padding-right: 2rem;
}

.content {
    flex: 1;
    background: white;
    padding: 2rem;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0,0,0,0.05);
}

/* Portrait */
.portrait-container {
    text-align: center;
    margin-bottom: 1.5rem;
}

.portrait {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    border: 5px solid white;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.personal-info {
    text-align: center;
    margin-bottom: 2rem;
}

.personal-info h1 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.personal-info p {
    margin-bottom: 0.3rem;
    color: var(--text-light);
    font-size: 0.9rem;
}

.contact-info {
    margin: 1.5rem 0;
    text-align: left;
    padding: 0 1rem;
}

.contact-info p {
    margin-bottom: 0.8rem;
    display: flex;
    align-items: center;
}

.contact-info i {
    margin-right: 0.8rem;
    color: var(--secondary-color);
    width: 20px;
    text-align: center;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1.5rem;
}

.social-links a {
    color: var(--text-light);
    font-size: 1.2rem;
    transition: color 0.3s;
}

.social-links a:hover {
    color: var(--secondary-color);
}

/* About Page Styles */
.about-section h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--light-color);
}

.about-section h3 {
    color: var(--dark-color);
    margin: 1.5rem 0 1rem;
}

.about-subsection {
    margin-bottom: 1.5rem;
    padding: 1rem;
    background-color: #f8f9fa;
    border-left: 3px solid var(--secondary-color);
    border-radius: 0 5px 5px 0;
}

.about-subsection h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

/* CV Page Styles */
.cv-section h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--light-color);
}

.cv-download {
    text-align: center;
    margin: 1.5rem 0;
}

.download-btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    background-color: var(--secondary-color);
    color: white;
    border-radius: 5px;
    font-weight: 500;
    transition: background-color 0.3s;
}

.download-btn:hover {
    background-color: #2980b9;
    color: white;
}

.download-btn i {
    margin-right: 0.5rem;
}

.cv-content h3 {
    color: var(--primary-color);
    margin: 1.5rem 0 1rem;
    padding-bottom: 0.3rem;
    border-bottom: 1px solid #eee;
}

.cv-item {
    margin-bottom: 1.5rem;
}

.cv-item-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.cv-item-title {
    font-weight: 600;
    color: var(--dark-color);
}

.cv-item-date {
    color: var(--text-light);
    font-size: 0.9rem;
}

.cv-item-subtitle {
    font-style: italic;
    margin-bottom: 0.3rem;
}

.cv-item-description {
    font-size: 0.95rem;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 0.8rem;
    margin-top: 0.5rem;
}

.skill-tag {
    display: inline-block;
    padding: 0.4rem 0.8rem;
    background-color: var(--light-color);
    border-radius: 20px;
    font-size: 0.9rem;
    text-align: center;
}

.language-list {
    list-style: none;
}

.language-list li {
    margin-bottom: 0.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px dashed #eee;
}

.language-list li:last-child {
    border-bottom: none;
}

.awards-list {
    list-style: none;
}

.awards-list li {
    margin-bottom: 0.8rem;
    padding-left: 1.2rem;
    position: relative;
}

.awards-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

/* Publications Page */
.publication-category {
    margin-bottom: 2.5rem;
}

.publication-category h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    padding-bottom: 0.3rem;
    border-bottom: 1px solid var(--light-color);
}

.publication-list {
    list-style: none;
}

.publication-list li {
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px dashed #eee;
}

.publication-list li:last-child {
    border-bottom: none;
}

.publication-list strong {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.publication-list p {
    margin-bottom: 0.3rem;
    font-size: 0.95rem;
}

.publication-list em {
    font-style: italic;
}

.publication-links {
    margin-top: 0.8rem;
    display: flex;
    gap: 1rem;
}

.publication-links a {
    font-size: 0.9rem;
    color: var(--text-light);
    transition: color 0.3s;
    display: flex;
    align-items: center;
}

.publication-links a:hover {
    color: var(--secondary-color);
}

.publication-links i {
    margin-right: 0.3rem;
}

/* Notes Page */
.note-category {
    margin-bottom: 2.5rem;
}

.note-category h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    padding-bottom: 0.3rem;
    border-bottom: 1px solid var(--light-color);
}

.note-list {
    list-style: none;
}

.note-list li {
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px dashed #eee;
}

.note-list li:last-child {
    border-bottom: none;
}

.note-list strong {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.note-list p {
    margin-bottom: 0.8rem;
    font-size: 0.95rem;
    color: var(--text-light);
}

.note-links {
    display: flex;
    gap: 1rem;
}

.note-links a {
    font-size: 0.9rem;
    color: var(--text-light);
    transition: color 0.3s;
    display: flex;
    align-items: center;
}

.note-links a:hover {
    color: var(--secondary-color);
}

.note-links i {
    margin-right: 0.3rem;
}

/* Talks Page */
.talk-category {
    margin-bottom: 2.5rem;
}

.talk-category h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    padding-bottom: 0.3rem;
    border-bottom: 1px solid var(--light-color);
}

.talk-list {
    list-style: none;
}

.talk-list li {
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px dashed #eee;
}

.talk-list li:last-child {
    border-bottom: none;
}

.talk-list strong {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.talk-list p {
    margin-bottom: 0.3rem;
    font-size: 0.95rem;
}

.talk-list em {
    font-style: italic;
}

.talk-links {
    margin-top: 0.8rem;
    display: flex;
    gap: 1rem;
}

.talk-links a {
    font-size: 0.9rem;
    color: var(--text-light);
    transition: color 0.3s;
    display: flex;
    align-items: center;
}

.talk-links a:hover {
    color: var(--secondary-color);
}

.talk-links i {
    margin-right: 0.3rem;
}

/* Talks Page - Poster Styles */
.talk-with-poster {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px dashed #eee;
}

.talk-poster {
    flex: 0 0 180px;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
    border: 1px solid #eee;
}

.talk-poster img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.5s ease;
}

.talk-poster:hover {
    transform: translateY(-5px);
}

.talk-poster:hover img {
    transform: scale(1.03);
}

.talk-info {
    flex: 1;
}

/* Lightbox overlay */
.lightbox {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.9);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.lightbox img {
    max-width: 80%;
    max-height: 80%;
    border-radius: 8px;
}

.close-lightbox {
    position: absolute;
    top: 30px;
    right: 30px;
    color: white;
    font-size: 2rem;
    cursor: pointer;
}

@media (max-width: 768px) {
    .talk-with-poster {
        flex-direction: column;
    }
    .talk-poster {
        flex: 1;
        width: 100%;
        max-width: 250px;
    }
}


/* Footer */
footer {
    text-align: center;
    padding: 1.5rem;
    background: var(--primary-color);
    color: white;
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 900px) {
    .main-nav li {
        margin-right: 1rem;
        font-size: 0.9rem;
    }
    
    .skills-grid {
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    }
}

@media (max-width: 768px) {
    .container {
        flex-direction: column;
        padding: 0 1rem;
    }
    
    .sidebar {
        flex: 1;
        padding-right: 0;
        margin-bottom: 2rem;
        text-align: center;
    }
    
    .contact-info {
        text-align: center;
    }
    
    .main-nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .main-nav li {
        margin: 0.3rem 0.8rem;
    }
}

@media (max-width: 480px) {
    .skills-grid {
        grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
    }
    
    .cv-item-header {
        flex-direction: column;
    }
    
    .cv-item-date {
        margin-top: 0.3rem;
    }
}