body{font-family:Arial,sans-serif;background:#f3f4f6;color:#111827;margin:0}main{max-width:720px;margin:30px auto;background:white;padding:25px;border-radius:12px}label{display:block;margin:16px 0}input,select,button{padding:12px;border-radius:7px;border:1px solid #ccc;box-sizing:border-box}input{display:block;width:100%;margin-top:5px}button{background:#166534;color:white;cursor:pointer}a{color:#166534}td,th{padding:10px;text-align:left;border-bottom:1px solid #ccc}.error{background:#fee2e2;padding:12px}.notice{background:#dcfce7;padding:12px}