:root {
    --primary-color: #2d3748;
    --secondary-color: #4a5568;
    --accent-color: #3182ce;
    --background-color: #f7fafc;
    --text-color: #1a202c;
    --border-color: #e2e8f0;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

.header {
    background-color: var(--primary-color);
    color: white;
    padding: 2rem 1rem;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 2rem;
}

.profile-info h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.profile-info h2 {
    font-size: 1.5rem;
    font-weight: normal;
    margin-bottom: 0.5rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

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

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

.social-link {
    color: white;
    text-decoration: none;
    transition: color 0.3s ease;
}

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

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.section {
    margin-bottom: 3rem;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.section.visible {
    opacity: 1;
    transform: translateY(0);
}

.section-title {
    color: var(--primary-color);
    margin-bottom: 2rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent-color);
}

.timeline {
    position: relative;
    padding-left: 2rem;
}

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

.timeline-item::before {
    content: '';
    position: absolute;
    left: -2rem;
    top: 0.5rem;
    width: 1rem;
    height: 1rem;
    background-color: var(--accent-color);
    border-radius: 50%;
}

.timeline-item::after {
    content: '';
    position: absolute;
    left: -1.5rem;
    top: 1.5rem;
    width: 2px;
    height: calc(100% + 1rem);
    background-color: var(--border-color);
}

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

.timeline-content h3 {
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
}

.date {
    color: var(--accent-color);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.education-items {
    display: grid;
    gap: 2rem;
}

.education-item {
    background-color: white;
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.skill-category {
    background-color: white;
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.skill-category h3 {
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

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

.skill-list li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.skill-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent-color);
}

.additional-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background-color: white;
    padding: 1rem;
    border-radius: 0.5rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .contact-info {
        align-items: center;
    }

    .timeline {
        padding-left: 1.5rem;
    }

    .timeline-item::before {
        left: -1.5rem;
    }

    .timeline-item::after {
        left: -1rem;
    }

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

    .additional-info {
        grid-template-columns: 1fr;
    }
}