:root{
  --bg:#14110f; --bg2:#1d1916; --panel:#221d1a; --line:rgba(229,217,207,.14);
  --ink:#f3ece6; --muted:#a79c92; --beige:#e5d9cf; --accent:#c9a27a; --blue:#2b4a9a;
  --top:64px; --bot:56px;
  --font:"Segoe UI",system-ui,-apple-system,"Helvetica Neue",Arial,sans-serif;
  --serif:Georgia,"Times New Roman",serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%;overflow:hidden}
body{
  font-family:var(--font);color:var(--ink);
  background:radial-gradient(ellipse at 50% 40%,#2a231e 0%,var(--bg) 70%);
  -webkit-tap-highlight-color:transparent;
}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex:none}

/* Loader */
#loader{position:fixed;inset:0;z-index:100;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:20px;background:var(--bg);transition:opacity .5s,visibility .5s}
#loader.done{opacity:0;visibility:hidden}
#loader img{border-radius:50%;animation:pulse 1.6s ease-in-out infinite}
#loader p{color:var(--muted);font-size:.9rem;letter-spacing:.04em}
.bar{width:180px;height:3px;background:var(--line);border-radius:2px;overflow:hidden}
.bar span{display:block;height:100%;width:0;background:var(--accent);transition:width .25s}
@keyframes pulse{50%{transform:scale(1.06)}}

/* Top bar */
.topbar{position:fixed;top:0;left:0;right:0;height:var(--top);z-index:20;display:flex;align-items:center;justify-content:space-between;padding:0 max(16px,env(safe-area-inset-left));background:linear-gradient(#14110fee,#14110f00);}
.brand{display:flex;align-items:center;gap:12px;min-width:0}
.brand img{border-radius:50%;box-shadow:0 0 0 1px var(--line)}
.brand strong{display:block;font-family:var(--serif);font-size:1.05rem;font-weight:600;letter-spacing:.02em;white-space:nowrap}
.brand span{display:block;font-size:.72rem;color:var(--muted);letter-spacing:.14em;text-transform:uppercase;white-space:nowrap}
.actions{display:flex;align-items:center;gap:6px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:40px;min-width:40px;padding:0 10px;border-radius:10px;color:var(--beige);text-decoration:none;font-size:.85rem;font-weight:600;transition:background .2s,color .2s,transform .1s}
.btn:hover{background:rgba(229,217,207,.1)}
.btn:active{transform:scale(.95)}
.btn:focus-visible,.nav:focus-visible,#slider:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.btn.sm{height:34px;min-width:34px}
.btn.primary{background:var(--beige);color:#14110f;padding:0 14px;margin-left:6px}
.btn.primary:hover{background:#fff}
.btn.primary svg{width:18px;height:18px}

/* Stage */
.stage{position:fixed;top:var(--top);bottom:var(--bot);left:0;right:0;display:flex;align-items:center;justify-content:center;padding:8px 0 12px}
.book-wrap{position:relative;width:min(calc(100vw - 140px),1500px);height:100%;display:flex;align-items:center;justify-content:center;transition:transform .5s cubic-bezier(.4,0,.2,1)}
#book{opacity:0;transition:opacity .6s}
#book.ready{opacity:1}
.stf__parent{margin:0 auto}
.page{background:#e5d9cf;overflow:hidden}
.page img{display:block;width:100%;height:100%;object-fit:cover;user-select:none;-webkit-user-drag:none;pointer-events:none}
.page.hard{box-shadow:inset 3px 0 6px rgba(0,0,0,.15)}
.nav{position:absolute;z-index:5;top:50%;transform:translateY(-50%);width:48px;height:48px;border-radius:50%;display:grid;place-items:center;background:rgba(229,217,207,.08);border:1px solid var(--line);color:var(--beige);backdrop-filter:blur(6px);transition:background .2s,opacity .3s,transform .15s}
.nav:hover{background:rgba(229,217,207,.2)}
.nav:active{transform:translateY(-50%) scale(.92)}
.nav.prev{left:max(16px,env(safe-area-inset-left))}
.nav.next{right:max(16px,env(safe-area-inset-right))}
.nav[disabled]{opacity:.2;pointer-events:none}

/* Bottom bar */
.bottombar{position:fixed;left:0;right:0;bottom:0;height:var(--bot);z-index:20;display:flex;align-items:center;gap:10px;padding:0 max(16px,env(safe-area-inset-left)) env(safe-area-inset-bottom);justify-content:center;background:linear-gradient(#14110f00,#14110fee)}
#slider{-webkit-appearance:none;appearance:none;width:min(520px,50vw);height:4px;border-radius:2px;background:var(--line);outline:none;cursor:pointer}
#slider::-webkit-slider-thumb{-webkit-appearance:none;width:16px;height:16px;border-radius:50%;background:var(--beige);border:0;box-shadow:0 0 0 4px rgba(229,217,207,.15)}
#slider::-moz-range-thumb{width:16px;height:16px;border-radius:50%;background:var(--beige);border:0}
.counter{min-width:76px;text-align:right;font-variant-numeric:tabular-nums;font-size:.85rem;color:var(--muted);letter-spacing:.06em}

/* Panels */
.panel{position:fixed;top:0;bottom:0;z-index:40;width:min(340px,86vw);background:var(--panel);display:flex;flex-direction:column;box-shadow:0 0 40px rgba(0,0,0,.5);transition:transform .35s cubic-bezier(.4,0,.2,1);visibility:hidden}
.panel.left{left:0;transform:translateX(-105%)}
.panel.right{right:0;transform:translateX(105%)}
.panel.open{transform:none;visibility:visible}
.panel-head{display:flex;align-items:center;justify-content:space-between;padding:16px 16px 12px;border-bottom:1px solid var(--line)}
.panel-head h2{font-family:var(--serif);font-weight:600;font-size:1.1rem}
.thumbs{flex:1;overflow:auto;padding:14px;display:grid;grid-template-columns:repeat(2,1fr);gap:14px;align-content:start}
.thumb{position:relative;border-radius:6px;overflow:hidden;border:2px solid transparent;background:#e5d9cf;aspect-ratio:596/842;transition:border-color .2s,transform .2s}
.thumb:hover{transform:translateY(-2px)}
.thumb.active{border-color:var(--accent)}
.thumb img{width:100%;height:100%;object-fit:cover;display:block}
.thumb span{position:absolute;left:6px;bottom:6px;background:rgba(20,17,15,.85);padding:1px 8px;border-radius:99px;font-size:.72rem;font-weight:600}
#search-input{margin:14px 16px 6px;height:42px;padding:0 14px;border-radius:10px;border:1px solid var(--line);background:var(--bg);color:var(--ink);font:inherit;outline:none}
#search-input:focus{border-color:var(--accent)}
.results{flex:1;overflow:auto;padding:8px 16px 20px}
.results .hint{color:var(--muted);font-size:.88rem;line-height:1.5;padding:8px 0}
.result{display:block;width:100%;text-align:left;padding:12px;margin-bottom:8px;border-radius:10px;background:var(--bg);border:1px solid var(--line);transition:border-color .2s}
.result:hover{border-color:var(--accent)}
.result b{display:block;font-size:.78rem;color:var(--accent);letter-spacing:.08em;text-transform:uppercase;margin-bottom:4px}
.result p{font-size:.85rem;line-height:1.45;color:#d6ccc3}
.result mark{background:rgba(201,162,122,.35);color:#fff;border-radius:3px;padding:0 2px}

/* Zoomer */
.zoomer{position:fixed;inset:0;z-index:60;background:rgba(10,8,7,.96);display:none;flex-direction:column}
.zoomer.open{display:flex}
.zoom-tools{display:flex;align-items:center;justify-content:center;gap:10px;height:56px;border-bottom:1px solid var(--line)}
.zoom-tools .btn{font-size:1.3rem}
#z-level{min-width:56px;text-align:center;font-variant-numeric:tabular-nums;color:var(--muted)}
.zoom-view{flex:1;overflow:auto;cursor:grab;touch-action:pan-x pan-y pinch-zoom}
.zoom-view.drag{cursor:grabbing}
.zoom-inner{display:flex;gap:6px;justify-content:center;align-items:flex-start;min-width:100%;width:max-content;margin:0 auto;padding:16px}
.zoom-inner img{display:block;height:auto;background:#e5d9cf;box-shadow:0 10px 40px rgba(0,0,0,.6);user-select:none;-webkit-user-drag:none}

/* Toast */
.toast{position:fixed;left:50%;bottom:76px;transform:translate(-50%,20px);z-index:90;background:var(--beige);color:#14110f;padding:10px 18px;border-radius:99px;font-size:.88rem;font-weight:600;opacity:0;pointer-events:none;transition:opacity .25s,transform .25s}
.toast.show{opacity:1;transform:translate(-50%,0)}

/* Responsive */
@media (max-width:820px){
  :root{--top:56px;--bot:52px}
  .book-wrap{width:100vw}
  .nav{display:none}
  .brand span{display:none}
  .brand strong{font-size:.95rem}
  .btn.primary span{display:none}
  .btn.primary{padding:0 10px}
  #btn-full{display:none}
  .actions{gap:2px}
  #slider{width:44vw}
}
@media (max-width:620px){ .brand div{display:none} .brand img{width:36px;height:36px} }
@media (max-width:420px){ #btn-share{display:none} }
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}