:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;--bg:#0f1115;--panel:#171a21;--border:#2a2e38;--text:#e8eaf0;--muted:#9aa1b1;--accent:#4f8cff;--accent-contrast:#06121f;--danger:#ff6b6b;font-family:system-ui,-apple-system,Segoe UI,sans-serif}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial}}[hidden]{display:none!important}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0}#app{max-width:960px;margin:0 auto;padding:24px 16px 64px}header h1{margin-bottom:4px}.subtitle{color:var(--muted);margin-top:0}.step{background:var(--panel);border:1px solid var(--border);border-radius:12px;margin-bottom:20px;padding:20px}.step h2{margin-top:0}.optional{color:var(--muted);font-size:.8em;font-weight:400}.hint{color:var(--muted);font-size:.92em}.upload-grid,.perspective-grid,.marking-grid{grid-template-columns:1fr 1fr;gap:16px;display:grid}.upload-slot,.perspective-slot,.marking-slot{min-width:0}@media (width<=640px){.upload-grid,.perspective-grid,.marking-grid{grid-template-columns:1fr}}.upload-slot label{margin-bottom:6px;font-weight:600;display:block}.filename{color:var(--muted);min-height:1.2em;font-size:.85em}canvas{border:1px solid var(--border);cursor:crosshair;background:#000;border-radius:8px;max-width:100%;display:block}.perspective-editor{touch-action:none;max-width:100%;position:relative}.perspective-editor-inner{position:relative}.perspective-editor canvas{cursor:default;pointer-events:none}.handle{background:var(--accent);cursor:ns-resize;touch-action:none;border:2px solid #fff;border-radius:8px;width:16px;height:52px;margin-top:-26px;margin-left:-8px;position:absolute;box-shadow:0 0 0 4px #4f8cff40}.handle:before{content:"";border-top:2px solid #fff;border-right:2px solid #fff;width:6px;height:6px;position:absolute;top:50%;left:50%;transform:translate(-50%,-75%)rotate(-45deg)}.handle:after{content:"";border-bottom:2px solid #fff;border-left:2px solid #fff;width:6px;height:6px;position:absolute;top:50%;left:50%;transform:translate(-50%,-25%)rotate(-45deg)}.handle:active{cursor:grabbing}.perspective-controls,.pair-actions{gap:8px;margin-top:10px;display:flex}button{background:var(--border);color:var(--text);border:1px solid var(--border);cursor:pointer;border-radius:8px;padding:8px 14px;font-size:.9em}button:hover:not(:disabled){filter:brightness(1.15)}button:disabled{opacity:.45;cursor:not-allowed}button.primary{background:var(--accent);color:var(--accent-contrast);border-color:var(--accent);margin-top:14px;font-weight:600}button.danger{color:var(--danger);border-color:var(--danger);background:0 0}.restart-bar{border-top:1px solid var(--border);flex-wrap:wrap;align-items:center;gap:12px;margin-top:8px;padding-top:20px;display:flex}.restart-bar .hint{margin:0}.pair-panel{margin-top:18px}#pairList{max-height:200px;margin:0;padding:0;list-style:none;overflow-y:auto}#pairList li{border-bottom:1px solid var(--border);font-variant-numeric:tabular-nums;justify-content:space-between;align-items:center;padding:6px 10px;font-size:.85em;display:flex}#pairList li button{padding:2px 8px;font-size:.8em}.transform-choice{flex-wrap:wrap;align-items:center;gap:14px;margin-top:16px;font-size:.9em;display:flex}.gif-options{flex-wrap:wrap;gap:16px;margin-bottom:4px;display:flex}.gif-options label{color:var(--muted);flex-direction:column;gap:4px;font-size:.85em;display:flex}.gif-options select{background:var(--border);color:var(--text);border:1px solid var(--border);border-radius:6px;padding:6px 8px;font-size:.95em}.error{color:var(--danger);font-weight:600}.opacity-control{flex-direction:column;gap:6px;max-width:420px;margin-top:14px;display:flex}.gif-progress{align-items:center;gap:10px;margin-top:14px;display:flex}.gif-result{flex-direction:column;align-items:flex-start;gap:10px;margin-top:16px;display:flex}.gif-result img{border:1px solid var(--border);border-radius:8px;max-width:100%}.gif-result a{background:var(--accent);color:var(--accent-contrast);border-radius:8px;padding:8px 16px;font-weight:600;text-decoration:none;display:inline-block}