/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fafafa;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header styles */
.header {
    padding: 60px 0;
    text-align: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    margin-bottom: 60px;
    border-radius: 0 0 20px 20px;
}

.profile-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
}

.profile-image {
    position: relative;
}

.profile-image img {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
}

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

.profile-info h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.profile-info .title {
    font-size: 1.2rem;
    font-weight: 400;
    opacity: 0.9;
    margin-bottom: 20px;
}

.social-links {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.social-links a {
    color: white;
    font-size: 1.5rem;
    transition: transform 0.3s ease, opacity 0.3s ease;
    opacity: 0.8;
}

.social-links a:hover {
    transform: translateY(-3px);
    opacity: 1;
}

/* Main content styles */
.main-content {
    display: flex;
    flex-direction: column;
    gap: 80px;
}

/* Section ordering for filters */
.main-content > section {
    transition: all 0.5s ease;
}

section {
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

section:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
}

section h2 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 30px;
    color: #2d3748;
    position: relative;
}

section h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 2px;
}

/* Filter section */
.filter-section {
    background: white;
    padding: 15px 0;
    border-bottom: 1px solid #e2e8f0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

.filter-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    padding: 10px 0;
}

.filter-label {
    font-size: 0.9rem;
    color: #4a5568;
    font-weight: 500;
}

.filter-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 6px 12px;
    border: 1px solid #667eea;
    background: white;
    color: #667eea;
    border-radius: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.8rem;
}

.filter-btn:hover {
    background: #667eea;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

.filter-btn.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-color: #667eea;
}

/* Section visibility */
section[data-category] {
    transition: all 0.5s ease;
}

section.hidden {
    display: none;
}

section.priority-high {
    order: -3;
}

section.priority-medium {
    order: -2;
}

section.priority-low {
    order: -1;
}

/* About section */
.about-section p {
    font-size: 1.1rem;
    margin-bottom: 20px;
    color: #4a5568;
    line-height: 1.8;
}

/* Projects section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.project-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.project-image {
    position: relative;
    height: 250px;
    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-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.play-button {
    color: white;
    font-size: 3rem;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease, background 0.3s ease;
}

.play-button:hover {
    transform: scale(1.1);
    background: rgba(255, 255, 255, 0.3);
}

.project-info {
    padding: 25px;
}

.project-info h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: #2d3748;
}

.project-info p {
    color: #4a5568;
    margin-bottom: 15px;
    line-height: 1.6;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* Publications section */
.publications-list {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.publication-item {
    padding: 25px;
    border: 1px solid #e2e8f0;
    border-radius: 10px;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.publication-item:hover {
    border-color: #667eea;
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.1);
}

.publication-item h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: #2d3748;
}

.publication-item .authors {
    color: #4a5568;
    font-style: italic;
    margin-bottom: 5px;
}

.publication-item .venue {
    color: #718096;
    font-size: 0.9rem;
    margin-bottom: 15px;
}

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

.btn {
    padding: 8px 16px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-secondary {
    background: #e2e8f0;
    color: #4a5568;
}

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

.award-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 25px;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    border-radius: 15px;
    border: 1px solid #e2e8f0;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.award-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.award-icon {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
}

.award-content h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: #2d3748;
}

.award-content p {
    color: #4a5568;
    margin-bottom: 12px;
    line-height: 1.6;
}

.award-badge {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* Education section */
.education-timeline {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.education-item {
    display: flex;
    gap: 30px;
    padding: 30px;
    background: linear-gradient(135deg, #f7fafc 0%, #edf2f7 100%);
    border-radius: 15px;
    border-left: 4px solid #4299e1;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.education-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
}

.education-date {
    flex-shrink: 0;
    width: 150px;
    font-weight: 600;
    color: #4299e1;
    font-size: 0.9rem;
}

.education-content h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 5px;
    color: #2d3748;
}

.education-content h4 {
    font-size: 1rem;
    color: #4a5568;
    margin-bottom: 15px;
    font-weight: 500;
}

.education-content p {
    color: #4a5568;
    line-height: 1.7;
    margin-bottom: 10px;
}

/* Experience section */
.experience-timeline {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.experience-item {
    display: flex;
    gap: 30px;
    padding: 30px;
    background: white;
    border-radius: 15px;
    border-left: 4px solid #667eea;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.experience-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
}

.experience-date {
    flex-shrink: 0;
    width: 150px;
    font-weight: 600;
    color: #667eea;
    font-size: 0.9rem;
}

.experience-content h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 5px;
    color: #2d3748;
}

.experience-content h4 {
    font-size: 1rem;
    color: #4a5568;
    margin-bottom: 15px;
    font-weight: 500;
}

.experience-content p {
    color: #4a5568;
    line-height: 1.7;
    margin-bottom: 15px;
}

.experience-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

/* Volunteering section */
.volunteering-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 25px;
}

.volunteering-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 25px;
    background: linear-gradient(135deg, #f0fff4 0%, #e6fffa 100%);
    border-radius: 15px;
    border: 1px solid #c6f6d5;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.volunteering-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.volunteering-icon {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #48bb78 0%, #38b2ac 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
}

.volunteering-content h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: #2d3748;
}

.volunteering-content h4 {
    font-size: 1rem;
    color: #4a5568;
    margin-bottom: 12px;
    font-weight: 500;
}

.volunteering-content p {
    color: #4a5568;
    line-height: 1.6;
    margin-bottom: 12px;
}

.volunteering-badge {
    background: linear-gradient(135deg, #48bb78 0%, #38b2ac 100%);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

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

.interest-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 25px;
    background: linear-gradient(135deg, #fff5f5 0%, #fed7d7 100%);
    border-radius: 15px;
    border: 1px solid #feb2b2;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.interest-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.interest-icon {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #ed8936 0%, #dd6b20 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
}

.interest-content h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: #2d3748;
}

.interest-content p {
    color: #4a5568;
    line-height: 1.6;
    margin-bottom: 12px;
}

.interest-badge {
    background: linear-gradient(135deg, #ed8936 0%, #dd6b20 100%);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* Skills section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.skill-category h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: #2d3748;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-tag {
    background: #f7fafc;
    color: #4a5568;
    padding: 6px 12px;
    border-radius: 15px;
    font-size: 0.9rem;
    border: 1px solid #e2e8f0;
    transition: background 0.3s ease, border-color 0.3s ease;
}

.skill-tag:hover {
    background: #edf2f7;
    border-color: #cbd5e0;
}

/* Footer */
.footer {
    text-align: center;
    padding: 40px 0;
    color: #718096;
    margin-top: 60px;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .header {
        padding: 40px 0;
        margin-bottom: 40px;
    }
    
    .profile-info h1 {
        font-size: 2rem;
    }
    
    .profile-info .title {
        font-size: 1rem;
    }
    
    .main-content {
        gap: 50px;
    }
    
    section {
        padding: 30px 20px;
    }
    
    section h2 {
        font-size: 1.5rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .awards-grid {
        grid-template-columns: 1fr;
    }
    
    .volunteering-grid,
    .interests-grid {
        grid-template-columns: 1fr;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .experience-item,
    .education-item {
        flex-direction: column;
        gap: 15px;
    }
    
    .experience-date,
    .education-date {
        width: auto;
    }
    
    .award-item,
    .volunteering-item,
    .interest-item {
        flex-direction: column;
        text-align: center;
    }
    
    .social-links {
        gap: 15px;
    }
    
    .social-links a {
        font-size: 1.2rem;
    }
    
    .filter-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .filter-btn {
        width: 200px;
    }
}

@media (max-width: 480px) {
    .profile-image img {
        width: 150px;
        height: 150px;
    }
    
    .profile-info h1 {
        font-size: 1.8rem;
    }
    
    .project-info {
        padding: 20px;
    }
    
    .publication-item {
        padding: 20px;
    }
    
    .publication-links {
        flex-direction: column;
    }
}

/* 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;
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #5a67d8 0%, #6b46c1 100%);
}