:root{--blue:#2563eb;--ink:#1a1a1a;--gray:#f2f2f2}*{box-sizing:border-box}body{margin:0;background:var(--gray);color:var(--ink);font:14px/1.7 "Noto Sans JP","Hiragino Kaku Gothic ProN",sans-serif}header{background:#fff;border-bottom:1px solid #ddd;padding:16px 24px;display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap}h1{font-size:18px;margin:0}a{color:var(--blue);text-underline-offset:3px}nav{display:flex;align-items:center;justify-content:center;gap:12px;padding:14px;flex-wrap:wrap}button,select{font:inherit;min-height:44px;border:1px solid #aaa;background:#fff;padding:8px 14px;border-radius:0;color:var(--ink)}button{cursor:pointer}button:disabled{opacity:.4;cursor:default}select{max-width:430px}#stage{max-width:1280px;margin:0 auto;background:#fff;border:1px solid #ddd;overflow:auto}#slide{display:block;width:100%;height:auto}#stage.zoomed #slide{width:1280px;max-width:none}footer{max-width:1280px;margin:16px auto;padding:0 16px;color:#444}button:focus-visible,a:focus-visible,select:focus-visible{outline:3px solid var(--blue);outline-offset:3px}@media(max-width:760px){header{padding:12px 16px;gap:8px}h1{font-size:16px}select{max-width:190px}nav{gap:8px}#stage{width:100%}}