*{box-sizing:border-box}body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Arial,sans-serif;margin:0;padding:0;background:#fafafa;color:#111}
nav{display:flex;gap:12px;padding:10px 14px;background:#111;color:#fff}
nav a{color:#fff;text-decoration:none;padding:6px 10px;border-radius:8px;background:#2a2a2a}
main{max-width:900px;margin:24px auto;padding:0 16px}
h2,h3{margin:8px 0 12px}
input,textarea,select,button{width:100%;padding:10px;margin:6px 0 12px;border:1px solid #ddd;border-radius:8px}
table{width:100%;border-collapse:collapse;margin-top:12px}
th,td{padding:8px;border-bottom:1px solid #eee;text-align:left}
button{cursor:pointer;background:#0f62fe;color:#fff;border:0}
button:hover{background:#0043ce}
.notice{padding:10px;border-radius:8px;background:#eef5ff;border:1px solid #d6e6ff}
.err{color:#b00020}