:root{font:13px -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#222;background:#f4f4f4;color-scheme:light}
*{box-sizing:border-box}body{margin:0;height:100dvh;display:grid;grid-template-rows:auto minmax(0,1fr) auto;overflow:hidden}
header{display:flex;align-items:center;gap:10px;min-height:48px;padding:8px 14px;border-bottom:1px solid #ccc}header strong{font-size:14px;margin-right:8px}.space{flex:1}
button{font:inherit;padding:5px 10px;cursor:pointer}button:disabled{cursor:default}button:focus-visible,canvas:focus-visible{outline:2px solid #276ec4;outline-offset:-2px}
main{position:relative;display:flex;align-items:center;justify-content:center;overflow:hidden;background:#292929;min-height:0}
canvas{display:block;max-width:100%;max-height:100%;width:auto;height:auto;aspect-ratio:4/3;object-fit:contain;outline:none}
#loading{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;gap:12px;background:#f4f4f4;color:#444}.spinner{width:18px;height:18px;border:2px solid #ccc;border-top-color:#444;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}
[hidden]{display:none!important}#drop{position:absolute;inset:12px;display:grid;place-items:center;background:#f4f4f4ee;border:2px dashed #777;font-size:20px;pointer-events:none}
footer{min-height:32px;padding:7px 14px;display:flex;align-items:center;gap:12px;flex-wrap:wrap;border-top:1px solid #ccc;font-size:12px}#notice{flex:1}#downloads{display:flex;gap:12px}a{color:#135ca0}
dialog{max-width:420px;border:1px solid #aaa;border-radius:6px;padding:12px 20px}dialog::backdrop{background:#0005}.actions{display:flex;justify-content:flex-end;gap:8px;margin:16px 0 4px}
@media(max-width:580px){header{gap:6px;padding:6px}header strong{margin-right:0}button{padding:5px}footer{padding:6px}}
@media(prefers-reduced-motion:reduce){.spinner{animation:none}}