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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica', 'Arial', sans-serif;
    line-height: 1.6;
    color: #1a1a1a;
    background: #fafafa;
    padding: 0;
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

.intro {
    margin-bottom: 3rem;
}

.intro h1 {
    font-size: 2rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 0.75rem;
}

.intro p {
    max-width: 640px;
    color: #333;
    margin-bottom: 0.6rem;
}

.intro-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem 1.25rem;
    margin-top: 1rem;
}

.intro-links a {
    color: #0366d6;
    text-decoration: none;
    font-size: 0.95rem;
    padding: 0.5rem 0;
}

.intro-links a:hover {
    text-decoration: underline;
}

.projects,
.group {
    margin-bottom: 3rem;
}

.projects h2,
.group h2 {
    font-size: 1.3rem;
    font-weight: 500;
    margin-bottom: 1.25rem;
    color: #333;
}

.featured-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
}

.project {
    padding: 1.5rem;
    background: white;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    transition: box-shadow 0.2s;
}

.project:hover {
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.project-name {
    font-size: 1.05rem;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 0.5rem;
}

.project-desc {
    color: #555;
    font-size: 0.9rem;
    line-height: 1.5;
}

.project-link {
    display: flex;
    text-decoration: none;
    color: inherit;
}

.project-link .project {
    flex: 1;
}

.project-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0 3rem;
}

.project-list li {
    border-bottom: 1px solid #f0f0f0;
}

.project-list a {
    display: block;
    min-height: 44px;
    padding: 0.6rem 0;
    color: #1a1a1a;
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.2s;
}

.project-list a:hover .project-list-name {
    color: #0366d6;
}

.project-list .list-desc {
    color: #666;
    font-size: 0.8rem;
    margin-left: 0.25rem;
}

a:focus-visible,
button:focus-visible {
    outline: 2px solid #0366d6;
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
    }
}

@media (max-width: 600px) {
    .intro h1 {
        font-size: 1.6rem;
    }

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

    .project {
        padding: 1.25rem;
    }

    .project-list {
        grid-template-columns: 1fr;
    }
}