:root{color-scheme:dark}*{box-sizing:border-box}body{margin:0;min-height:100vh;display:grid;place-items:center;font-family:system-ui,-apple-system,Segoe UI,Roboto,PingFang SC,Microsoft YaHei,sans-serif;background:#0f1115;color:#e6e6e6}.wrap{width:min(440px,92vw);padding:28px 24px;background:#161a21;border:1px solid #232934;border-radius:16px;box-shadow:0 10px 40px #00000059}h1{margin:0 0 6px;font-size:22px}.hint{margin:0 0 18px;font-size:13px;line-height:1.5;color:#8b93a3}.hint code{background:#232934;padding:1px 5px;border-radius:4px;font-size:12px}input{width:100%;padding:12px 14px;font-size:16px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;letter-spacing:1px;color:#e6e6e6;background:#0f1115;border:1px solid #2c333f;border-radius:10px;outline:none}input:focus{border-color:#4a7cff;box-shadow:0 0 0 3px #4a7cff2e}.cleaned{margin-top:8px;font-size:12px;color:#6b7280;word-break:break-all;min-height:16px}.result{margin-top:18px;text-align:center}.code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:52px;font-weight:700;letter-spacing:6px;color:#4a7cff}.meta{margin-top:10px;display:flex;align-items:center;justify-content:center;gap:14px}.timer{font-size:13px;color:#8b93a3;min-width:84px}.timer.warn{color:#ff6b6b}button{padding:6px 14px;font-size:13px;color:#e6e6e6;background:#232934;border:1px solid #2c333f;border-radius:8px;cursor:pointer}button:hover{background:#2c333f}.err{margin-top:12px;min-height:18px;font-size:13px;color:#ff6b6b;text-align:center}