*{box-sizing:border-box}body{color:#282828;background:#fff;margin:0}.shell{max-width:640px;margin:48px auto;padding:0 20px;font-family:system-ui,-apple-system,Segoe UI,Noto Sans KR,sans-serif}.shell h1{color:#1c3660;margin-bottom:4px}.sub{color:#6e6e6e;margin-top:0}.card{border:1px solid #dde3ec;border-radius:8px;margin-top:24px;padding:16px 20px}.card h2{color:#0072b2;margin-top:0;font-size:16px}.card pre{background:#f0f4fa;border-radius:6px;padding:12px;font-size:13px;overflow-x:auto}.ok{color:#009e73;font-weight:600}.err{color:#c0392b;font-weight:600}button{color:#fff;cursor:pointer;background:#0072b2;border:1px solid #0072b2;border-radius:6px;padding:8px 16px;font-size:15px}button:disabled{opacity:.6;cursor:default}.gate-shell{justify-content:center;align-items:center;min-height:100vh;font-family:system-ui,-apple-system,Segoe UI,Noto Sans KR,sans-serif;display:flex}.gate-card{text-align:center;border:1px solid #dde3ec;border-radius:12px;width:100%;max-width:360px;padding:32px 28px}.gate-card h1{color:#1c3660;margin-bottom:4px}.gate-sub{color:#6e6e6e;margin-top:0;margin-bottom:20px;font-size:14px}.gate-card form{flex-direction:column;gap:10px;display:flex}.gate-card input{text-align:center;letter-spacing:1px;border:1px solid #dde3ec;border-radius:6px;padding:10px 12px;font-size:15px}.gate-error{color:#c0392b;margin-top:14px;margin-bottom:0;font-size:13px}