*{box-sizing:border-box}
  html,body{margin:0;height:100%;background:var(--bg);font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--ink);overflow:hidden}
  #app{position:fixed;inset:0;display:flex;flex-direction:column}
  #stage{flex:1;position:relative;display:flex;align-items:center;justify-content:center;padding:18px 64px;min-height:0}
  #zoomwrap{transition:transform .25s ease;transform-origin:center center;display:flex;align-items:center;justify-content:center}
  #book{filter:drop-shadow(0 12px 24px rgba(66,70,78,.16));transition:transform .85s cubic-bezier(.45,0,.25,1);touch-action:pan-y;user-select:none;-webkit-user-select:none;cursor:grab}
  #book:active{cursor:grabbing}
  .page{background:#fff;overflow:hidden}
  .page img{width:100%;height:100%;object-fit:cover;display:block;user-select:none;-webkit-user-drag:none;pointer-events:none}
  .nav{position:absolute;top:50%;transform:translateY(-50%);width:44px;height:44px;border-radius:50%;border:0;
       background:var(--vulcan-0);color:var(--java-700);box-shadow:0 4px 8px rgba(66,70,78,.08);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .2s,opacity .2s;z-index:5}
  .nav:hover{background:var(--java-200);color:var(--java-800)}
  .nav:disabled{opacity:.25;cursor:default}
  #prev{left:12px} #next{right:12px}
  .nav svg{width:22px;height:22px}
  #bar{height:52px;flex:none;background:var(--vulcan-0);border-top:1px solid var(--java-200);display:flex;align-items:center;justify-content:center;gap:6px;padding:0 10px;backdrop-filter:blur(6px)}
  .btn{background:none;border:0;color:var(--vulcan-700);width:38px;height:38px;border-radius:8px;cursor:pointer;display:flex;align-items:center;justify-content:center}
  .btn:hover{background:var(--java-100);color:var(--java-700)}
  .btn:disabled{opacity:.35;cursor:default}
  .btn:disabled:hover{background:none;color:var(--vulcan-700)}
  .btn:focus-visible,.nav:focus-visible{outline:2px solid var(--java-700);outline-offset:2px}
  .btn svg{width:20px;height:20px}
  .btn[hidden]{display:none}
  #count{font-size:14px;font-variant-numeric:tabular-nums;min-width:74px;text-align:center;letter-spacing:.02em}
  .sep{width:1px;height:22px;background:var(--vulcan-200);margin:0 6px}
  #stage{overflow:hidden}
  #thumbs{position:absolute;left:0;right:0;bottom:0;background:rgba(255,255,255,.92);border-top:1px solid var(--java-200);backdrop-filter:blur(8px);
          display:flex;gap:10px;padding:12px;overflow-x:auto;justify-content:safe center;transform:translateY(100%);visibility:hidden;transition:transform .25s ease,visibility 0s .25s;z-index:6}
  #thumbs.open{transform:none;visibility:visible;transition:transform .25s ease}
  #thumbs button{flex:none;border:2px solid transparent;padding:0;background:none;cursor:pointer;border-radius:4px;overflow:hidden;opacity:.75;transition:opacity .2s,border-color .2s}
  #thumbs button:hover{opacity:1}
  #thumbs button.on{border-color:var(--accent);opacity:1}
  #thumbs img{display:block;height:96px;width:auto}
  #hint{white-space:nowrap;position:absolute;bottom:14px;left:50%;transform:translateX(-50%);font-size:12px;color:var(--vulcan-700);pointer-events:none;transition:opacity .6s}
  @media (max-width:640px){
    #stage{padding:10px 8px}
    .nav{display:none}
    #thumbs img{height:72px}
  }