/* CSS Variables */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-card: #ffffff;
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a68;
    --accent-primary: #0066cc;
    --accent-secondary: #00a3a3;
    --accent-hover: #0052a3;
    --border-color: #e0e0e0;
    --shadow: rgba(0, 0, 0, 0.08);
    --badge-full: #28a745;
    --badge-mini: #ffc107;
    --badge-demo: #17a2b8;
    --badge-second: #6c757d;
    --badge-professional: #0066cc;
    --badge-personal: #7c3aed;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Container */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* Header */
.header {
    text-align: center;
    padding: 2rem 0 3rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 2rem;
}

.name {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.title {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--accent-primary);
    margin-bottom: 0.25rem;
}

.subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.tagline {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: 1.5rem;
}

.contact-info {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.contact-link {
    color: var(--accent-primary);
    text-decoration: none;
}

.contact-link:hover {
    text-decoration: underline;
}

.separator {
    color: var(--border-color);
}

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

.social-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    background-color: var(--bg-secondary);
    border-radius: 6px;
    text-decoration: none;
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: background-color 0.2s, transform 0.2s;
}

.social-link:hover {
    background-color: var(--border-color);
    transform: translateY(-1px);
}

.social-link i {
    font-size: 1.6rem;
    opacity: 0.8;
}

/* Sections */
.section {
    margin-bottom: 3rem;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent-primary);
    display: inline-block;
}

/* Languages */
.languages-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    margin-top: 1.5rem;
}

.languages {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.language-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background-color: var(--bg-secondary);
    border-radius: 8px;
}

.language-flag {
    font-size: 1.25rem;
    line-height: 1;
}

.language-name {
    font-weight: 600;
    color: var(--text-primary);
}

.language-level {
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding-left: 0.5rem;
    border-left: 1px solid var(--border-color);
}

/* About Description */
.about-description {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1rem;
}

/* Publications */
.publications-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.publication-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.25rem;
    cursor: pointer;
    transition: box-shadow 0.2s, transform 0.2s;
}

.publication-card:hover {
    box-shadow: 0 4px 12px var(--shadow);
    transform: translateY(-2px);
}

.publication-card.expanded {
    box-shadow: 0 4px 16px var(--shadow);
}

.publication-card.highlighted {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px var(--accent-primary);
}

.publication-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.pub-type-badge {
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.pub-type-full {
    background-color: var(--badge-full);
    color: white;
}

.pub-type-mini {
    background-color: var(--badge-mini);
    color: #1a1a2e;
}

.pub-type-demo {
    background-color: var(--badge-demo);
    color: white;
}

.pub-type-second {
    background-color: var(--badge-second);
    color: white;
}

.pub-year {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.publication-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.publication-authors {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.publication-venue {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-style: italic;
}

.publication-details {
    display: none;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.publication-card.expanded .publication-details {
    display: block;
    animation: fadeIn 0.3s ease;
}

.publication-abstract {
    font-size: 0.9rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
    line-height: 1.7;
}

.publication-contribution {
    font-size: 0.9rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
    padding: 0.75rem;
    background-color: var(--bg-secondary);
    border-radius: 6px;
    border-left: 3px solid var(--accent-secondary);
}

.publication-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tag {
    padding: 0.25rem 0.6rem;
    background-color: var(--bg-secondary);
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
}

.publication-links {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.pub-link {
    padding: 0.4rem 0.8rem;
    background-color: var(--accent-primary);
    color: white;
    text-decoration: none;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 500;
    transition: background-color 0.2s;
}

.pub-link:hover {
    background-color: var(--accent-hover);
}

.related-projects {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.related-project-link {
    color: var(--accent-primary);
    text-decoration: none;
    margin-left: 0.5rem;
}

.related-project-link:hover {
    text-decoration: underline;
}

/* Projects */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.25rem;
}

.project-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.25rem;
    cursor: pointer;
    transition: box-shadow 0.2s, transform 0.2s;
}

.project-card:hover {
    box-shadow: 0 4px 12px var(--shadow);
    transform: translateY(-2px);
}

.project-card.expanded {
    box-shadow: 0 4px 16px var(--shadow);
}

.project-card.highlighted {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px var(--accent-primary);
}

.project-header {
    margin-bottom: 0.75rem;
}

.project-type-badge {
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.project-type-badge.professional {
    background-color: var(--badge-professional);
    color: white;
}

.project-type-badge.personal {
    background-color: var(--badge-personal);
    color: white;
}

.project-name {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.project-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    line-height: 1.5;
}

.project-contribution {
    font-size: 0.85rem;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    padding: 0.5rem;
    background-color: var(--bg-secondary);
    border-radius: 4px;
}

.project-technologies {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 0.75rem;
}

.tech-tag {
    padding: 0.2rem 0.5rem;
    background-color: var(--bg-secondary);
    border-radius: 4px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
}

.project-link {
    display: inline-block;
    color: var(--accent-primary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}

.project-link:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

.project-details {
    display: none;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
    line-height: 1.7;
    color: var(--text-primary);
}

.project-card.expanded .project-details {
    display: block;
    animation: fadeIn 0.3s ease;
}

/* Skills */
.skills-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.skill-category {
    background-color: var(--bg-secondary);
    padding: 1.25rem;
    border-radius: 8px;
}

.skill-category-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.skills-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.skill-button {
    padding: 0.5rem 1rem;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.9rem;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s;
    font-family: 'Inter', system-ui, sans-serif;
}

.skill-button:hover:not(:disabled) {
    background-color: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
}

.skill-button.active {
    background-color: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
}

.skill-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.skill-highlight-info {
    position: sticky;
    top: 1rem;
    z-index: 100;
    margin-top: 1.5rem;
    padding: 1rem;
    background-color: var(--bg-secondary);
    border-radius: 8px;
    min-height: 50px;
    display: none;
    box-shadow: 0 4px 12px var(--shadow);
}

.skill-highlight-info.visible {
    display: block;
    animation: fadeIn 0.3s ease;
}

.skill-highlight-info .close-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--text-secondary);
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.3s, color 0.2s;
    padding: 0.25rem;
    line-height: 1;
}

.skill-highlight-info .close-btn:hover {
    color: var(--text-primary);
}

.skill-highlight-info.show-close .close-btn {
    opacity: 1;
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem 0;
    border-top: 1px solid var(--border-color);
    margin-top: 2rem;
}

.footer p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.footer a {
    color: var(--accent-primary);
    text-decoration: none;
}

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

.last-updated {
    font-size: 0.8rem !important;
    color: var(--text-secondary);
    opacity: 0.7;
}

.credits {
    font-size: 0.8rem !important;
    color: var(--text-secondary);
    opacity: 0.7;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */
@media (max-width: 600px) {
    .container {
        padding: 1.5rem 1rem;
    }
    
    .name {
        font-size: 2rem;
    }
    
    .title {
        font-size: 1.1rem;
    }
    
    .section-title {
        font-size: 1.25rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .social-links {
        flex-direction: column;
        align-items: center;
    }
    
    .languages {
        flex-direction: column;
    }
    
    .language-item {
        min-width: auto;
    }
}

/* Print Styles */
@media print {
    .publication-card,
    .project-card,
    .skill-button {
        break-inside: avoid;
    }
    
    .publication-details,
    .project-details {
        display: block !important;
    }
    
    .skill-highlight-info {
        display: none;
    }
}