/* 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: #fff;
}

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

/* Header and Navigation */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid #e5e5e5;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: #2563eb;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: #2563eb;
}

/* Hero Section */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.hero h2 {
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-description {
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto 3rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.btn-primary {
    background: #fff;
    color: #2563eb;
}

.btn-primary:hover {
    background: #f8fafc;
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: #fff;
    border-color: #fff;
}

.btn-secondary:hover {
    background: #fff;
    color: #2563eb;
    transform: translateY(-2px);
}

/* Skills Section */
.skills {
    padding: 80px 0;
    background: #f8fafc;
}

.skills h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #1e293b;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.skill-category {
    background: #fff;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease;
}

.skill-category:hover {
    transform: translateY(-5px);
}

.skill-category h3 {
    color: #2563eb;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.skill-category ul {
    list-style: none;
}

.skill-category li {
    padding: 0.5rem 0;
    border-bottom: 1px solid #e5e5e5;
    color: #64748b;
}

.skill-category li:last-child {
    border-bottom: none;
}

/* Experience Section */
.experience {
    padding: 80px 0;
}

.experience h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #1e293b;
}

.timeline {
    max-width: 800px;
    margin: 0 auto;
}

.timeline-item {
    position: relative;
    padding-left: 2rem;
    margin-bottom: 3rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 12px;
    height: 12px;
    background: #2563eb;
    border-radius: 50%;
}

.timeline-item::after {
    content: '';
    position: absolute;
    left: 5px;
    top: 12px;
    width: 2px;
    height: calc(100% + 1rem);
    background: #e5e5e5;
}

.timeline-item:last-child::after {
    display: none;
}

.timeline-content h3 {
    color: #1e293b;
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.timeline-content h4 {
    color: #2563eb;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.period {
    color: #64748b;
    font-size: 0.9rem;
    font-weight: 500;
}

.timeline-content p {
    margin-top: 1rem;
    color: #64748b;
    line-height: 1.7;
}

/* Projects Section */
.projects {
    padding: 80px 0;
    background: #f8fafc;
}

.projects h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #1e293b;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.project-card {
    background: #fff;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease;
}

.project-card:hover {
    transform: translateY(-5px);
}

.project-card h3 {
    color: #1e293b;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.project-card p {
    color: #64748b;
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tech-tag {
    background: #e0e7ff;
    color: #3730a3;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

/* Contact Section */
.contact {
    padding: 80px 0;
    text-align: center;
}

.contact h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #1e293b;
}

.contact p {
    font-size: 1.2rem;
    color: #64748b;
    margin-bottom: 3rem;
}

.contact-info {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #64748b;
}

.contact-item i {
    color: #2563eb;
    font-size: 1.2rem;
}

.contact-item a {
    color: #64748b;
    text-decoration: none;
    transition: color 0.3s ease;
}

.contact-item a:hover {
    color: #2563eb;
}

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

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: #2563eb;
    color: #fff;
    border-radius: 50%;
    text-decoration: none;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: #1d4ed8;
    transform: translateY(-3px);
}

/* Footer */
.footer {
    background: #1e293b;
    color: #94a3b8;
    text-align: center;
    padding: 2rem 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-links {
        gap: 1rem;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .contact-info {
        flex-direction: column;
        gap: 1rem;
    }
    
    .timeline-item {
        padding-left: 1.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .skills-grid,
    .projects-grid {
        grid-template-columns: 1fr;
    }
}

/* Education Section */
.education {
    padding: 80px 0;
    background: #fff;
}

.education h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #1e293b;
}

.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.education-card {
    background: #f8fafc;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease;
    border-left: 4px solid #2563eb;
}

.education-card:hover {
    transform: translateY(-5px);
}

.education-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.education-header h3 {
    color: #1e293b;
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    flex: 1;
}

.education-period {
    background: #2563eb;
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    white-space: nowrap;
}

.education-school {
    color: #2563eb;
    font-size: 1.1rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.education-gpa {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    color: #64748b;
    font-weight: 500;
}

.education-gpa i {
    color: #f59e0b;
}

.courses h5 {
    color: #1e293b;
    margin-bottom: 1rem;
    font-size: 1rem;
    font-weight: 600;
}

.course-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.course-tag {
    background: #e0e7ff;
    color: #3730a3;
    padding: 0.375rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.course-tag:hover {
    background: #3730a3;
    color: white;
    transform: translateY(-2px);
}

/* Responsive Design for Education Section */
@media (max-width: 768px) {
    .education-grid {
        grid-template-columns: 1fr;
    }
    
    .education-header {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .education-period {
        align-self: flex-start;
    }
}

@media (max-width: 480px) {
    .education-grid {
        grid-template-columns: 1fr;
    }
    
    .education-card {
        padding: 1.5rem;
    }
    
    .course-tags {
        gap: 0.375rem;
    }
    
    .course-tag {
        font-size: 0.8rem;
        padding: 0.25rem 0.625rem;
    }
}

/* Open Source Contributions Section */
.open-source {
    padding: 80px 0;
    background: #fff;
}

.open-source h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #1e293b;
}

.open-source-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.contribution-card {
    background: #f8fafc;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease;
    border-left: 4px solid #10b981;
}

.contribution-card:hover {
    transform: translateY(-5px);
}

.contribution-header h3 {
    color: #1e293b;
    font-size: 1.3rem;
    margin-bottom: 1rem;
    font-family: monospace;
    background: #e5e7eb;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    display: inline-block;
}

.contribution-description {
    color: #64748b;
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.pull-requests {
    margin-bottom: 1.5rem;
}

.pull-requests h4 {
    color: #1e293b;
    font-size: 1rem;
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.pull-requests ul {
    list-style: none;
    padding-left: 0;
}

.pull-requests li {
    color: #059669;
    padding: 0.5rem 0;
    border-bottom: 1px solid #e5e5e5;
    font-family: monospace;
    font-size: 0.9rem;
}

.pull-requests li:last-child {
    border-bottom: none;
}

.pull-requests li::before {
    content: '#';
    color: #6b7280;
    margin-right: 0.5rem;
}

.contribution-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

/* Responsive Design for Open Source Section */
@media (max-width: 768px) {
    .open-source-grid {
        grid-template-columns: 1fr;
    }
    
    .contribution-card {
        padding: 1.5rem;
    }
    
    .contribution-header h3 {
        font-size: 1.1rem;
    }
}

@media (max-width: 480px) {
    .open-source-grid {
        grid-template-columns: 1fr;
    }
    
    .contribution-tech {
        gap: 0.375rem;
    }
}

/* Project Links */
.project-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid #e5e5e5;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: #2563eb;
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.project-link:hover {
    background: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.project-link i {
    font-size: 0.8rem;
}

/* Responsive design for project links */
@media (max-width: 480px) {
    .project-links {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .project-link {
        justify-content: center;
    }
}