:root{font-family:Arial,"Hiragino Kaku Gothic ProN","Noto Sans JP",sans-serif;color:#242424;background:#fff;font-synthesis:none;color-scheme:light}
*{box-sizing:border-box}body{margin:0}main{width:min(100% - 40px,360px);margin:0 auto;padding:24px 0 20px}h1{font-size:15px;font-weight:600;letter-spacing:.19em;text-align:center;margin:0 0 22px}.preview{position:relative;width:min(100%,calc((100svh - 400px)*var(--ratio,.75)));min-width:150px;aspect-ratio:var(--ratio,.75);margin:auto;box-shadow:0 0 0 1px #e3e3e3}canvas{display:block;width:100%;height:100%}.boundary{position:absolute;left:-12px;right:-12px;height:44px;transform:translateY(-50%);cursor:ns-resize;touch-action:none;display:flex;align-items:center;justify-content:center;outline:none}.boundary span{display:block;width:34px;height:8px;border:1px solid #bcbcbc;border-radius:8px;background:#fff;box-shadow:0 1px 4px #0002}.boundary:focus-visible span,.boundary:hover span{border-color:#222;box-shadow:0 0 0 3px #0002}.hint{font-size:12px;text-align:center;color:#777;margin:12px 0 18px}.spacing{display:flex;gap:16px;align-items:center;font-size:14px;margin-bottom:16px}input[type=range]{flex:1;min-width:0;accent-color:#242424;height:28px;cursor:pointer}output{font-size:12px;color:#777;width:25px;text-align:right;font-variant-numeric:tabular-nums}.actions{display:flex;gap:10px}button{flex:1;min-height:46px;border:1px solid #d3d3d3;border-radius:6px;background:white;color:#242424;font:inherit;font-size:14px;cursor:pointer}button#save{background:#242424;color:white;border-color:#242424}button:disabled{opacity:.35;cursor:default}button:focus-visible,input:focus-visible{outline:2px solid #555;outline-offset:4px}button:not(:disabled):hover{filter:brightness(.92)}#status{min-height:20px;margin:12px 0 0;font-size:13px;text-align:center;color:#666;line-height:1.6}.meta{font-size:12px;text-align:center;color:#888;margin:6px 0 0}@media(max-height:540px){.preview{width:180px}main{padding-top:16px}}@media(prefers-reduced-motion:no-preference){button{transition:opacity .15s}}

.ratios{display:flex;border:0;padding:0;margin:0 0 12px;gap:10px;align-items:center}.ratios legend{float:left;font-size:14px;margin-right:16px;padding:0}.ratios label{flex:1;cursor:pointer;position:relative}.ratios input{position:absolute;opacity:0}.ratios span{display:block;text-align:center;padding:12px 4px;font-size:14px;border:1px solid #ddd;border-radius:6px}.ratios input:checked+span{border-color:#242424;background:#f3f3f3}.ratios input:focus-visible+span{outline:2px solid #555;outline-offset:3px}

.grid-overlay{position:absolute;inset:0;pointer-events:none;background-image:linear-gradient(to right,transparent calc(100% - 2px),#0006 calc(100% - 2px),#fff9 calc(100% - 1px)),linear-gradient(to bottom,transparent calc(100% - 2px),#0006 calc(100% - 2px),#fff9 calc(100% - 1px));background-size:10% 10%}.grid-control{display:flex;align-items:center;justify-content:space-between;gap:8px;margin:0 0 8px}.grid-control label{font-size:14px;min-height:44px;display:flex;align-items:center;gap:4px;cursor:pointer}.grid-control input{width:18px;height:18px;accent-color:#242424}.grid-control>span{font-size:12px;color:#777}.proportions{font-size:12px;text-align:center;margin:0 0 14px;color:#555;font-variant-numeric:tabular-nums}