:root{--bg:#f5f7fb;--card:#ffffff;--text:#17233a;--brand:#0f766e;--err:#b42318}*{box-sizing:border-box}body{margin:0;font-family:Segoe UI,PingFang SC,sans-serif;background:linear-gradient(135deg,#f8fafc,#eef6ff);color:var(--text)}.wrap{max-width:980px;margin:0 auto;padding:24px}textarea{width:100%;min-height:220px;padding:12px;border-radius:10px;border:1px solid #cfd8e3}.actions{display:flex;gap:10px;flex-wrap:wrap;margin:12px 0}button{border:0;background:var(--brand);color:#fff;padding:8px 14px;border-radius:8px;cursor:pointer}button:disabled{opacity:.6;cursor:not-allowed}.card{background:var(--card);border-radius:12px;padding:16px;box-shadow:0 8px 30px #17233a14;margin-top:12px}pre{white-space:pre-wrap;background:#f8fafc;padding:10px;border-radius:8px}.err{color:var(--err)}.links{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:8px}a{color:#0b5ed7;text-decoration:none}a:hover{text-decoration:underline}