*{box-sizing:border-box;margin:0;padding:0}
  :root{--bg:#f4f6f9;--card:#fff;--primary:#4a90e2;--primary-soft:#e8f1fc;--text:#2c3e50;--text-sub:#7b8a99;--border:#eef1f5;--shadow:0 2px 12px rgba(0,0,0,.06);--radius:16px}
  body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text);min-height:100vh;padding:24px}
  .app{max-width:1440px;margin:0 auto}
  .card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px}
  .header{display:flex;align-items:center;justify-content:space-between;margin-bottom:22px}
  .header h1{font-size:22px;font-weight:600}
  .back{font-size:13px;color:var(--text-sub);text-decoration:none;padding:6px 12px;background:var(--bg);border-radius:8px}
  .back:hover{background:var(--primary-soft);color:var(--primary)}
  label{display:block;font-size:13px;color:var(--text-sub);margin-bottom:6px}
  textarea{width:100%;min-height:100px;padding:12px;border:1px solid var(--border);border-radius:10px;font-size:14px;font-family:Consolas,monospace;resize:vertical}
  textarea:focus,input:focus,select:focus{outline:none;border-color:var(--primary)}
  .algo-row{display:flex;gap:12px;align-items:center;margin-bottom:14px;flex-wrap:wrap}
  .algo-row select{padding:9px 14px;border:1px solid var(--border);border-radius:10px;font-size:14px}
  .hint{font-size:12px;color:var(--text-sub)}
  .chk{display:none;align-items:center;gap:5px;font-size:13px;color:var(--text-sub);cursor:pointer}
  .chk.show{display:flex}
  .chk input{accent-color:var(--primary)}
  #keyRow{display:flex;gap:12px;margin-bottom:14px;flex-wrap:wrap}
  #keyRow .field{flex:1;min-width:200px}
  #keyRow .lbl-row{display:flex;align-items:center;justify-content:space-between}
  #keyRow .mini{font-size:11px;color:var(--primary);cursor:pointer;user-select:none}
  #keyRow .mini:hover{text-decoration:underline}
  #keyRow input{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:10px;font-size:14px;font-family:Consolas,monospace}
  .btn-group{display:flex;gap:10px;margin:14px 0;flex-wrap:wrap}
  .btn{padding:10px 20px;border:none;border-radius:10px;font-size:14px;cursor:pointer;background:var(--primary);color:#fff}
  .btn:hover{opacity:.88}
  .btn.warn{background:#e67e22}
  .btn.ghost{background:var(--bg);color:var(--text-sub)}
  .btn.ghost:hover{background:var(--primary-soft);color:var(--primary)}
  .result{background:var(--bg);border-radius:10px;padding:14px;font-family:Consolas,monospace;font-size:14px;word-break:break-all;white-space:pre-wrap;min-height:60px}
  .codes{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:20px}
  .code-box .cb-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px}
  .code-box .cb-head label{margin-bottom:0}
  .copy-mini{border:none;background:var(--primary-soft);color:var(--primary);font-size:12px;padding:4px 10px;border-radius:6px;cursor:pointer}
  .copy-mini:hover{opacity:.8}
  .code-box pre{background:#282c34;color:#abb2bf;border-radius:10px;padding:14px;font-size:12px;line-height:1.6;overflow-x:auto;white-space:pre-wrap;word-break:break-all;font-family:Consolas,monospace;min-height:120px}
  .note{margin-top:12px;font-size:12px;color:var(--text-sub);background:var(--primary-soft);border-radius:8px;padding:10px 12px;line-height:1.6}
  @media(max-width:720px){.codes{grid-template-columns:1fr}}
  .toast{position:fixed;bottom:30px;left:50%;transform:translateX(-50%) translateY(20px);background:var(--text);color:#fff;padding:10px 20px;border-radius:10px;font-size:13px;opacity:0;transition:all .3s;pointer-events:none}
  .toast.show{opacity:1;transform:translateX(-50%) translateY(0)}