*{box-sizing:border-box;margin:0;padding:0}body{color:#1a1a1a;background:#f0f2f5;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif}.navbar{color:#fff;background:#2c3e50;justify-content:space-between;align-items:center;padding:1rem 2rem;display:flex;box-shadow:0 2px 8px #0000001a}.navbar a,.navbar button{color:#fff;cursor:pointer;background:0 0;border:none;margin-left:1.5rem;font-size:1rem;text-decoration:none}.navbar button:hover,.navbar a:hover{text-decoration:underline}.logo{font-size:1.5rem;font-weight:700}.nav-links{align-items:center;display:flex}.container{max-width:1200px;margin:2rem auto;padding:0 1rem}.card{background:#fff;border-radius:12px;max-width:400px;margin:2rem auto;padding:2rem;box-shadow:0 4px 12px #0000001a}.card h2{text-align:center;margin-bottom:1.5rem}form input,form select,form button{border:1px solid #ccc;border-radius:8px;width:100%;margin-bottom:1rem;padding:.75rem;font-size:1rem}form button{color:#fff;cursor:pointer;background:#2c3e50;border:none;font-weight:700}form button:hover{background:#1e2b38}.course-card{background:#fff;border-radius:10px;margin-bottom:1rem;padding:1rem;box-shadow:0 2px 6px #0000000d}.course-card h3{margin-bottom:.5rem}button{color:#fff;cursor:pointer;background:#3498db;border:none;border-radius:6px;padding:.5rem 1rem}button:hover{background:#2980b9}