body{color:#fff;background:#121212;margin:0;font-family:Arial,sans-serif}.navbar{background:#1e1e1e;justify-content:space-between;padding:1rem 2rem;display:flex}.navbar a{color:#fff;margin-left:1rem;text-decoration:none}.container{padding:2rem}.hero{text-align:center;margin-top:4rem}.hero button{cursor:pointer;margin-top:1rem;padding:10px 20px}.problem-card{background:#222;border-radius:8px;margin-bottom:1rem;padding:1rem}.problem-layout{grid-template-columns:1fr 1fr;gap:2rem;padding:2rem;display:grid}.problem-description,.editor{background:#222;border-radius:8px;padding:1.5rem}textarea{color:#fff;background:#111;border:1px solid #444;width:100%;padding:1rem}button{margin-top:1rem;padding:10px 20px}.week-card{background:#1e1e1e;border-radius:10px;margin-bottom:2rem;padding:1.5rem}.week-card h2{color:#61dafb;margin-top:0}.problem-card{background:#2a2a2a;border-radius:8px;margin-top:1rem;padding:1rem}