:root {
    --bg: #ffffff;
    --text: #1a1a1a;
    --primary: #2563eb;
    --secondary: #64748b;
    --line: #e5e7eb;
}

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

body {
    font-family: system-ui, -apple-system, sans-serif;
    line-height: 1.7;
    color: var(--text);
    max-width: 850px;
    margin: 0 auto;
    padding: 2rem;
}

.header {
    margin: 4rem 0;
}

h1 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.header p {
    color: var(--secondary);
    font-size: 1.25rem;
}

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

.social-links a {
    margin-right: 1rem;
    color: var(--primary);
    text-decoration: none;
}

.timeline {
    position: relative;
    margin: 4rem 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 1px;
    background: var(--line);
}

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

.entry::before {
    content: '';
    position: absolute;
    left: -4px;
    top: 8px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary);
}

.date {
    color: var(--secondary);
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.entry-description {
    color: var(--secondary);
    font-size: 1.1rem;
    margin: 1rem 0 1.5rem 0;
    font-weight: normal;
}

.project {
    margin: 1.5rem 0;
}

.project h3 {
    font-size: 1.25rem;
    font-weight: 500;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.project-date {
    font-size: 0.875rem;
    color: var(--secondary);
}

.project a {
    display: inline-block;
    margin-right: 1rem;
    margin-top: 0.5rem;
}

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

a:hover {
    text-decoration: underline;
}

.links {
    margin-top: 1rem;
}

.links a {
    display: block;
    margin-bottom: 0.5rem;
}

.links-wrapper {
    margin-top: 1rem;
}

.links-wrapper a {
    display: inline-block;
    margin-right: 1rem;
}

@media (max-width: 640px) {
    body {
        padding: 1rem;
    }
    
    .entry {
        padding-left: 1.5rem;
    }
}