body{font-family:Arial,sans-serif;margin:0;padding:0;background:#f9f9f9;color:#333}header nav{display:flex;gap:15px;padding:20px;background:#1e3c72;color:#fff;align-items:center}header nav a,header nav button{color:#fff;text-decoration:none;padding:8px 12px;border-radius:6px}header nav button{background:#ff6b6b;border:0;cursor:pointer}.hero,footer{text-align:center;color:#fff}.hero{padding:60px;background:linear-gradient(90deg,#1e3c72,#2a5298)}.hero hr{margin:40px auto;width:50%;border:1px solid #fff}.themes{display:flex;flex-wrap:wrap;justify-content:center;padding:20px;gap:20px}.theme-card{background:#fff;border:1px solid #ddd;border-radius:12px;padding:20px;width:280px;box-shadow:0 4px 8px rgba(0,0,0,.1);text-align:center}.theme-card img{width:100%;border-radius:8px;margin-bottom:10px}.theme-card a{display:inline-block;margin:5px 0;color:#1e3c72;text-decoration:none}.theme-card a:hover{text-decoration:underline}footer{padding:30px;background:#1e3c72;margin-top:40px}