.fha-wrap{max-width:980px;margin:1.5rem auto;font-family:system-ui,Segoe UI,Roboto,Arial,sans-serif}
.fha-controls,.fha-guides{display:flex;gap:.6rem;align-items:center;flex-wrap:wrap;margin:.5rem 0}
.fha-inline{display:flex;gap:.4rem;align-items:center}
.fha-canvas-wrap{position:relative;width:100%;background:#0f172a;border-radius:12px;overflow:hidden;margin:1rem 0;border:1px solid #1e293b}
#fha-canvas{width:100%;height:auto;display:block;cursor:crosshair}
.fha-results{background:#f8fafc;border:1px solid #e2e8f0;border-radius:12px;padding:1rem;white-space:pre-wrap}
button#fha-analyze,button#fha-export,#fha-zoom-in,#fha-zoom-out,#fha-reset-view,#fha-reset-guides,.fha-line-btn{background:#111;color:#fff;border:none;padding:.5rem .8rem;border-radius:10px;cursor:pointer}
button[disabled]{opacity:.5;cursor:not-allowed}
.guide-hint{font-size:.85rem;color:#64748b}
.fha-line-btn.active{background:#0ea5e9}