.tool-main{flex:1;display:flex;flex-direction:column;width:100%;max-width:100%;padding:0;overflow:hidden}.tool-header{display:flex;align-items:flex-start;justify-content:space-between;gap:1.5rem;flex-wrap:wrap;padding:1.5rem 2rem;border-bottom:1px solid var(--color-border);background-color:var(--color-surface-raised);flex-shrink:0}.tool-header__title{display:flex;flex-direction:column;gap:.25rem}.tool-title{font-size:1.3rem;font-weight:700;color:var(--color-text-title)}.tool-subtitle{font-size:.85rem;color:var(--color-text-muted)}.tool-header__controls{display:flex;align-items:center;gap:1rem;flex-wrap:wrap}.ctrl-label{display:flex;align-items:center;gap:.45rem;font-size:.82rem;color:var(--color-text-secondary);-webkit-user-select:none;user-select:none}.ctrl-number{width:4.5rem;background-color:var(--color-surface-raised);border:1px solid var(--color-border);border-radius:5px;color:var(--color-text-primary);font-size:.82rem;padding:.25rem .4rem;text-align:center;outline:none;-moz-appearance:textfield}.ctrl-number::-webkit-inner-spin-button,.ctrl-number::-webkit-outer-spin-button{opacity:.4}.ctrl-number:focus{border-color:var(--color-accent)}.ctrl-range{width:90px;accent-color:var(--color-accent);cursor:pointer}.view-toggle{display:flex;border:1px solid var(--color-border);border-radius:6px;overflow:hidden}.view-toggle__btn{background:none;border:none;border-right:1px solid var(--color-border);color:var(--color-text-secondary);font-size:.82rem;font-weight:500;padding:.35rem .85rem;cursor:pointer;transition:background-color .15s ease,color .15s ease;white-space:nowrap}.view-toggle__btn:last-child{border-right:none}.view-toggle__btn:hover{background-color:var(--color-surface-deep);color:var(--color-text-primary)}.view-toggle__btn.is-active{background-color:var(--color-accent-bg);color:var(--color-accent)}.drop-row{display:grid;grid-template-columns:1fr 1fr;border-bottom:1px solid var(--color-border);flex-shrink:0}.drop-zone{position:relative;display:flex;align-items:center;justify-content:center;min-height:180px;background-color:var(--color-surface-deep);cursor:pointer;transition:background-color .15s ease,border-color .15s ease;outline:none}.drop-zone:first-child{border-right:1px solid var(--color-border)}.drop-zone:focus-visible{box-shadow:inset 0 0 0 2px var(--color-accent)}.drop-zone.is-dragover{background-color:var(--color-accent-bg);box-shadow:inset 0 0 0 2px var(--color-accent)}.drop-zone.is-error{box-shadow:inset 0 0 0 2px var(--color-danger)}.drop-zone__inner{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.4rem;padding:1.5rem;pointer-events:none;text-align:center;width:100%;height:100%}.drop-zone__inner:has(.drop-zone__preview){pointer-events:auto;gap:.35rem}.drop-zone__icon{font-size:2.2rem;line-height:1;opacity:.35}.drop-zone__title{font-size:.95rem;font-weight:600;color:var(--color-text-faint);letter-spacing:.02em}.drop-zone__hint{font-size:.78rem;color:var(--color-text-ghost)}.drop-zone__file-input{position:absolute;inset:0;opacity:0;cursor:pointer;width:100%;height:100%}.drop-zone__preview{max-width:100%;max-height:140px;object-fit:contain;border-radius:4px;border:1px solid var(--color-border);display:block}.drop-zone__filename{font-size:.78rem;color:var(--color-text-secondary);max-width:28ch;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.drop-zone__dims{font-size:.73rem;color:var(--color-text-faint);font-variant-numeric:tabular-nums}.drop-zone__clear-btn{background:none;border:1px solid var(--color-border);border-radius:5px;color:var(--color-text-muted);font-size:.73rem;padding:.2rem .55rem;margin-top:.2rem;cursor:pointer;transition:color .15s ease,border-color .15s ease;pointer-events:auto;position:relative;z-index:1}.drop-zone__clear-btn:hover{color:var(--color-danger);border-color:var(--color-danger)}.diff-stats{display:flex;align-items:center;gap:1.25rem;padding:.55rem 1.25rem;background-color:var(--color-surface-raised);border-bottom:1px solid var(--color-border);font-size:.8rem;flex-shrink:0;flex-wrap:wrap}.diff-stats__item{font-weight:600;font-variant-numeric:tabular-nums}.diff-stats__item--del{color:var(--color-danger)}.diff-stats__item--unchanged{color:var(--color-text-muted);font-weight:400}.diff-stats__item--info{color:var(--color-text-secondary);font-weight:400}.diff-stats__item--warn{color:var(--color-warning)}.diff-stats__item--ok{color:var(--color-success)}.diff-stats__identical{color:var(--color-success);font-weight:600}.canvas-toolbar{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.5rem 1.25rem;background-color:var(--color-surface-raised);border-bottom:1px solid var(--color-border);flex-shrink:0;flex-wrap:wrap}.zoom-controls{display:flex;align-items:center;gap:.4rem}.zoom-btn{background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:5px;color:var(--color-text-secondary);font-size:.9rem;width:28px;height:28px;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:color .15s ease,border-color .15s ease;flex-shrink:0}.zoom-btn:hover{color:var(--color-text-primary);border-color:var(--color-sep)}.zoom-btn--reset{width:auto;padding:0 .6rem;font-size:.75rem}.zoom-level{font-size:.8rem;color:var(--color-text-muted);font-variant-numeric:tabular-nums;min-width:3.5ch;text-align:center}.save-btn{background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:6px;color:var(--color-text-secondary);font-size:.8rem;padding:.3rem .85rem;cursor:pointer;transition:color .15s ease,border-color .15s ease,background-color .15s ease}.save-btn:hover{color:var(--color-text-primary);border-color:var(--color-accent);background-color:var(--color-accent-bg)}.canvas-outer{flex:1;overflow:auto;background-color:var(--color-checker-a);background-image:linear-gradient(45deg,var(--color-checker-b) 25%,transparent 25%),linear-gradient(-45deg,var(--color-checker-b) 25%,transparent 25%),linear-gradient(45deg,transparent 75%,var(--color-checker-b) 75%),linear-gradient(-45deg,transparent 75%,var(--color-checker-b) 75%);background-size:20px 20px;background-position:0 0,0 10px,10px -10px,-10px 0px;min-height:200px}.canvas-scroll{display:inline-block;min-width:100%;min-height:100%;padding:1.5rem;box-sizing:border-box}.canvas-stage{display:inline-block;position:relative;line-height:0;transform-origin:top left}#diff-canvas{display:block;image-rendering:pixelated;image-rendering:crisp-edges;box-shadow:var(--shadow-canvas)}@media(max-width:700px){.tool-header{padding:1rem;flex-direction:column;gap:.75rem}.tool-header__controls{gap:.6rem}.drop-row{grid-template-columns:1fr}.drop-zone:first-child{border-right:none;border-bottom:1px solid var(--color-border)}.canvas-toolbar{flex-direction:column;align-items:flex-start;gap:.5rem}}