.tool-panel{max-width:850px;margin:2rem auto;padding:1.5rem;background:#fff;color:#172033;border:1px solid #cbd5e1;border-radius:16px;line-height:1.6}
.tool-panel label{display:block;font-weight:700;margin-top:1rem}
.tool-panel input,.tool-panel select{box-sizing:border-box;width:100%;padding:.75rem;border:1px solid #64748b;border-radius:8px;font:inherit}
.tool-panel button{margin:1rem 0;padding:.8rem 1.2rem;border:0;border-radius:8px;background:#164ac3;color:white;font:inherit;cursor:pointer}
.tool-panel pre{white-space:pre-wrap;overflow-wrap:anywhere;font-size:.95rem}
.tool-panel :focus-visible,.checksum-wrap :focus-visible{outline:3px solid #a34300;outline-offset:4px}
.checksum-drop:focus-within{outline:3px solid #a34300;outline-offset:4px}
.tool-panel button:disabled{opacity:.65;cursor:wait}
@media(max-width:600px){.tool-panel{margin:1rem;padding:1rem}}