:root{--bg: #0f1115;--panel: #181b22;--accent: #6ea8fe;--text: #e6e8ec;--muted: #9aa3b2}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);padding:24px}header h1{margin:0 0 4px;font-size:1.5rem}.sub{color:var(--muted);margin:0 0 4px;max-width:720px}.note{color:#e7c46b;background:#e7c46b14;border:1px solid rgba(231,196,107,.25);border-radius:8px;padding:8px 12px;margin:10px 0 0;max-width:720px;font-size:.85rem;line-height:1.4}.note strong{color:#f3d684}.backend{color:var(--accent);font-size:.85rem;margin:8px 0 0;min-height:1.1em}main{max-width:1100px}.stage{display:flex;gap:16px;flex-wrap:wrap;margin:18px 0}.canvas-wrap{position:relative;width:512px;height:512px;background:var(--panel);border-radius:10px;overflow:hidden;flex:0 0 auto}@media (max-width: 1100px){.canvas-wrap{width:min(512px,44vw);height:min(512px,44vw)}canvas{width:100%!important;height:100%!important}}canvas{display:block;width:512px;height:512px;touch-action:none}#mask{position:absolute;inset:0;cursor:crosshair}#image{position:absolute;inset:0}#result{display:block}.placeholder{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:var(--muted);letter-spacing:.2em;text-transform:uppercase;font-size:.8rem}.controls{background:var(--panel);border-radius:10px;padding:16px}.row{display:flex;gap:14px;align-items:center;flex-wrap:wrap;margin-bottom:12px}.row:last-child{margin-bottom:0}label{color:var(--muted);font-size:.9rem;display:inline-flex;align-items:center;gap:6px}button,.filebtn{background:#262b35;color:var(--text);border:1px solid #333a47;border-radius:8px;padding:8px 14px;cursor:pointer;font-size:.9rem}button#run{background:var(--accent);color:#0b0d11;border:none;font-weight:600}button#run .hint{font-weight:400;font-size:.85em;opacity:.75}button:disabled{opacity:.5;cursor:not-allowed}.status{color:var(--muted);font-size:.9rem}.progress{height:12px;background:#262b35;border-radius:6px;overflow:hidden;margin-top:10px}#bar{height:100%;width:0;background:linear-gradient(90deg,var(--accent),#9ec5ff);transition:width .15s ease-out}.bar-label{margin-top:6px;font-size:.8rem;color:var(--muted);min-height:1.1em;font-variant-numeric:tabular-nums}input[type=range]{accent-color:var(--accent)}