*{margin:0;padding:0;box-sizing:border-box}
body{background:#0d1117;color:#c9d1d9;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;min-height:100vh}
nav{padding:1.5rem;border-bottom:1px solid #30363d}
nav h1{font-size:1.5rem;color:#58a6ff}
main{max-width:960px;margin:3rem auto;padding:0 1rem}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1.5rem}
.card{background:#161b22;border:1px solid #30363d;border-radius:8px;padding:1.5rem;text-decoration:none;color:#c9d1d9;transition:border-color .2s}
.card:hover{border-color:#58a6ff}
.card h2{font-size:1.2rem;margin-bottom:.5rem;color:#58a6ff}
.card p{font-size:.9rem;color:#8b949e}
@media(max-width:600px){.grid{grid-template-columns:1fr}}