:root{color-scheme:dark;font:15px/1.4 system-ui,sans-serif;background:#000;color:#fff}*{box-sizing:border-box}html,body{margin:0;width:100%;height:100%;overflow:hidden;background:#000}main{height:100vh;height:100dvh;display:flex;flex-direction:column;background:#000}#scroller{flex:1;min-height:0;overflow:hidden;display:flex;align-items:center;justify-content:center;overscroll-behavior-x:contain;touch-action:pan-y pinch-zoom;background:#000}#sheet{flex:none;position:relative;margin:0 auto;overflow:hidden;background:#000}canvas{display:block;width:100%;height:100%}.links{position:absolute;inset:0}.hotspot{position:absolute;display:block;background:transparent;border:0;border-radius:0;padding:0;min-width:0;min-height:0;cursor:pointer;color:transparent;touch-action:pan-y pinch-zoom}.hotspot:focus-visible{outline:3px solid #ffda65;outline-offset:-3px;background:#ffffff22}nav{flex:none;display:flex;justify-content:center;align-items:center;gap:clamp(6px,3vw,18px);padding:6px 10px max(6px,env(safe-area-inset-bottom));background:#000}button{font:inherit;font-size:21px;color:#fff;background:#171717;border:1px solid #333;border-radius:8px;min-width:44px;min-height:44px;cursor:pointer;touch-action:manipulation}button:disabled{opacity:.3;cursor:default}button:focus-visible{outline:2px solid white;outline-offset:2px}#counter{font-size:13px;text-align:center;min-width:52px;font-variant-numeric:tabular-nums}#message{font-size:13px;text-align:center;padding:4px;margin:0}#message:empty{display:none}#failure{text-align:center;padding:10px}#failure button{font-size:15px}#failure a{color:white}[hidden]{display:none!important}

/* White margins around the menu; navigation remains dark. */
html,body,main,#scroller,#sheet{background:#fff}

#message{position:fixed;bottom:70px;left:12px;right:12px;color:#fff;background:#000c;z-index:3}

:root{color-scheme:light;--page-bg:#fff;color:#222;background:var(--page-bg)}
html,body,main,#scroller,#sheet{background:var(--page-bg)}
nav{background:#fff;gap:clamp(8px,4vw,24px);padding-top:8px;padding-bottom:max(8px,env(safe-area-inset-bottom));}
nav button{display:grid;place-items:center;background:#fff;color:#222;border:0;border-radius:8px;width:44px;height:44px;}
nav button svg{width:24px;height:24px}
nav button:focus-visible{outline:2px solid #222}
nav button:hover:not(:disabled){background:#f1f1f1}

nav{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);column-gap:0;padding-left:max(8px,env(safe-area-inset-left));padding-right:max(8px,env(safe-area-inset-right))}
.page-navigation{grid-column:2;display:flex;align-items:center;gap:clamp(4px,2vw,16px)}
.sr-only{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}

#failure a{color:#222}