body{margin:0;font-family:Arial,Helvetica,sans-serif;background:#f6f7f9;color:#111827}nav{background:#111827;color:white;padding:14px 24px;display:flex;gap:18px;align-items:center}nav a{color:white;text-decoration:none}main{max-width:1100px;margin:28px auto;padding:0 18px}.card,.box{background:white;border-radius:14px;padding:22px;box-shadow:0 8px 24px rgba(0,0,0,.06);margin-bottom:18px}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:18px}label{display:block;margin:12px 0 6px;font-weight:700}input,select{width:100%;box-sizing:border-box;padding:12px;border:1px solid #d1d5db;border-radius:10px}button{margin-top:14px;background:#111827;color:white;border:0;padding:12px 18px;border-radius:10px;cursor:pointer}table{width:100%;border-collapse:collapse;background:white;border-radius:14px;overflow:hidden}th,td{padding:12px;border-bottom:1px solid #e5e7eb;text-align:left}.error{background:#fee2e2;color:#991b1b;padding:12px;border-radius:10px}.ok{background:#dcfce7;color:#166534;padding:12px;border-radius:10px}small{color:#6b7280}h2{margin-top:0}