body{margin:0;background:#0b1020;color:#fff;font-family:Arial}header{display:flex;justify-content:space-between;padding:20px;background:#111827;border-bottom:3px solid #facc15}.logo{font-size:2rem;font-weight:bold}.logo span{color:#60a5fa}nav a{color:#fff;margin:0 10px;text-decoration:none}.hero{display:flex;justify-content:space-around;align-items:center;padding:80px 10%;background:linear-gradient(#0b1020,#111827)}.btn{background:#2563eb;color:#fff;padding:12px 20px;border-radius:8px;text-decoration:none}.cards{display:flex;gap:20px;justify-content:center;padding:40px;flex-wrap:wrap}.card{background:#1f2937;padding:20px;border:2px solid #facc15;border-radius:12px;width:220px;text-align:center}.placeholder{width:320px;height:420px;border:2px dashed #60a5fa;display:flex;align-items:center;justify-content:center;text-align:center}footer{text-align:center;padding:20px;background:#111827}