:root{
  --red:#b92728;
  --red-deep:#7c1618;
  --ink:#1b1b1b;
  --paper:#ffffff;
  --desk:#e9e6e1;
  --bar:#262626;
  --bar-2:#1a1a1a;
  --muted:#8b8b8b;
  --ui:"Segoe UI",-apple-system,BlinkMacSystemFont,"Helvetica Neue",Arial,"Microsoft YaHei",sans-serif;
}

*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{
  margin:0;padding:0;height:100%;overflow:hidden;
  font-family:var(--ui);background:var(--desk);color:var(--ink);
}

/* ---------- 阅读台背景 ---------- */
body::before{
  content:"";position:fixed;inset:0;z-index:0;
  background:
    radial-gradient(120% 90% at 50% 0%,#f3f1ee 0%,#e7e4de 45%,#ddd9d2 100%);
}
body::after{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;opacity:.5;
  background-image:
    repeating-linear-gradient(45deg,rgba(0,0,0,.012) 0 2px,transparent 2px 4px),
    repeating-linear-gradient(-45deg,rgba(0,0,0,.012) 0 2px,transparent 2px 4px);
}

/* ---------- 加载层 ---------- */
.loader{
  position:fixed;inset:0;z-index:200;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(160deg,#8f1c1e,#b92728 60%,#7c1618);
  transition:opacity .25s ease,visibility .25s;
}
.loader.hide{opacity:0;visibility:hidden}
.loader-inner{text-align:center;color:#fff;width:min(360px,74vw)}
.loader-brand{
  font-size:30px;letter-spacing:.42em;font-weight:600;margin-bottom:26px;
  text-indent:.42em;
}
.loader-bar{height:2px;background:rgba(255,255,255,.24);overflow:hidden;border-radius:2px}
.loader-bar i{display:block;height:100%;width:0;background:#fff;transition:width .3s ease}
.loader-txt{margin-top:16px;font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:rgba(255,255,255,.72)}

/* ---------- 顶栏 ---------- */
.topbar{
  position:fixed;top:0;left:0;right:0;height:56px;z-index:60;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 22px;pointer-events:none;
}
.topbar > *{pointer-events:auto}
.brand{display:flex;align-items:center;gap:11px;font-size:13px;letter-spacing:.13em}
.brand-mark{width:4px;height:19px;background:var(--red);display:block}
.brand-name{font-weight:700;letter-spacing:.2em}
.brand-sep{width:1px;height:13px;background:#c3beb7}
.brand-sub{color:#7d766d;letter-spacing:.05em;font-size:12px}

.tbtn{
  display:inline-flex;align-items:center;gap:7px;height:34px;padding:0 13px;
  border:1px solid rgba(0,0,0,.13);background:rgba(255,255,255,.72);
  color:#3d3a35;border-radius:3px;cursor:pointer;font-family:var(--ui);
  font-size:12px;letter-spacing:.06em;transition:background .18s,border-color .18s,color .18s;
  backdrop-filter:blur(6px);
}
.tbtn:hover{background:#fff;border-color:rgba(0,0,0,.28);color:#000}
.tbtn svg{width:15px;height:15px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.tbtn.round{width:34px;padding:0;justify-content:center}

/* ---------- 书台 ---------- */
.stage{
  position:absolute;inset:56px 0 52px 0;z-index:10;
  display:flex;align-items:center;justify-content:center;
}
.book-shell{
  position:relative;
  width:100%;height:100%;
  display:flex;align-items:center;justify-content:center;
  padding:10px 74px;
}
.book{
  position:relative;
  box-shadow:
    0 2px 4px rgba(60,50,40,.10),
    0 18px 40px -12px rgba(60,45,30,.30),
    0 42px 80px -30px rgba(60,45,30,.32);
}

/* 书页厚度 */
.book::after{
  content:"";position:absolute;inset:0;pointer-events:none;z-index:-1;
  box-shadow:0 0 0 1px rgba(0,0,0,.055);
}

/* StPageFlip 页面 */
.page{background:#fff;overflow:hidden}
.page img{display:block;width:100%;height:100%;object-fit:fill;user-select:none;-webkit-user-drag:none}
.page.--left{border-right:1px solid rgba(0,0,0,.055)}
.page.--right{border-left:1px solid rgba(0,0,0,.055)}

/* 中缝阴影（跨页） */
.stf__block{position:relative}
.book.spread .stf__block::after{
  content:"";position:absolute;top:0;bottom:0;left:50%;width:56px;transform:translateX(-50%);
  pointer-events:none;z-index:5;
  background:linear-gradient(90deg,
    rgba(0,0,0,0) 0%,
    rgba(0,0,0,.035) 32%,
    rgba(0,0,0,.085) 48%,
    rgba(0,0,0,.035) 68%,
    rgba(0,0,0,0) 100%);
}

/* ---------- 左右箭头 ---------- */
.nav-arrow{
  position:absolute;top:50%;transform:translateY(-50%);z-index:40;
  width:42px;height:70px;border:0;background:transparent;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  color:#a9a29a;transition:color .2s,transform .2s,opacity .2s;
}
.nav-arrow svg{width:26px;height:26px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}
.nav-arrow.prev{left:14px}
.nav-arrow.next{right:14px}
.nav-arrow:hover{color:var(--red);transform:translateY(-50%) scale(1.1)}
.nav-arrow[disabled]{opacity:.22;cursor:default}

/* ---------- 底栏 ---------- */
.toolbar{
  position:fixed;left:0;right:0;bottom:0;height:52px;z-index:60;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 16px;
  background:linear-gradient(180deg,rgba(38,38,38,.94),rgba(20,20,20,.97));
  backdrop-filter:blur(10px);
  border-top:1px solid rgba(255,255,255,.06);
}
.toolbar .tbtn{
  background:transparent;border-color:rgba(255,255,255,.16);color:#cfcac4;
}
.toolbar .tbtn:hover{background:rgba(255,255,255,.09);border-color:rgba(255,255,255,.32);color:#fff}
.tb-left,.tb-right{display:flex;align-items:center;gap:8px;min-width:120px}
.tb-right{justify-content:flex-end}
.tb-center{display:flex;align-items:center;gap:14px}
.pageno{
  display:flex;align-items:center;gap:5px;color:#e8e4de;
  font-size:13px;letter-spacing:.06em;font-variant-numeric:tabular-nums;min-width:74px;
  justify-content:center;
}
.pageno em{font-style:normal;color:#6f6a64;margin:0 1px}

/* ---------- 目录 ---------- */
.toc{
  position:fixed;inset:0;z-index:120;background:rgba(18,16,15,.94);
  backdrop-filter:blur(14px);
  display:flex;flex-direction:column;
  opacity:0;visibility:hidden;transition:opacity .3s,visibility .3s;
}
.toc.open{opacity:1;visibility:visible}
.toc-head{
  display:flex;align-items:center;justify-content:space-between;
  padding:22px 30px 14px;color:#fff;border-bottom:1px solid rgba(255,255,255,.09);
}
.toc-head h2{margin:0;font-size:15px;font-weight:600;letter-spacing:.22em;text-transform:uppercase}
.toc-close{
  border:0;background:transparent;color:#b9b3ac;font-size:32px;line-height:1;
  cursor:pointer;padding:0 4px;transition:color .2s;
}
.toc-close:hover{color:#fff}
.toc-grid{
  flex:1;overflow-y:auto;padding:26px 30px 40px;
  display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));
  gap:20px 18px;align-content:start;
}
.toc-item{
  border:0;padding:0;background:transparent;cursor:pointer;text-align:left;
  color:#cfcac4;font-family:var(--ui);
}
.toc-item img{
  width:100%;display:block;border-radius:2px;
  box-shadow:0 6px 18px -6px rgba(0,0,0,.7);
  transition:transform .22s,box-shadow .22s;
  background:#fff;
}
.toc-item:hover img{transform:translateY(-4px);box-shadow:0 12px 26px -8px rgba(0,0,0,.8)}
.toc-item.active img{outline:2px solid var(--red);outline-offset:2px}
.toc-item span{
  display:block;margin-top:8px;font-size:11px;letter-spacing:.09em;color:#8e8880;
}
.toc-item.active span{color:#fff}

/* ---------- 移动端 ---------- */
@media (max-width:820px){
  .topbar{height:46px;padding:0 12px}
  .brand-sub,.brand-sep{display:none}
  .brand{font-size:12px;gap:8px}
  .brand-name{letter-spacing:.16em}
  .tbtn{padding:0 10px;height:32px;font-size:11px}
  .tbtn span{display:none}
  .tbtn svg{width:16px;height:16px}
  .stage{inset:46px 0 46px 0}
  .nav-arrow{width:32px;height:56px}
  .nav-arrow.prev{left:0}
  .nav-arrow.next{right:0}
  .toolbar{height:46px;padding:0 8px}
  .tb-left{min-width:0}
  .tb-right{min-width:0}
  .pageno{min-width:62px;font-size:12px}
  .toc-grid{grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:14px 12px;padding:18px 16px 30px}
  .toc-head{padding:16px 18px 12px}
}

/* 调试/截图：?nofade 直接隐藏加载层 */
body.nofade .loader{display:none!important}

/* 书体容器：绝对定位给 StPageFlip 一个确定的父尺寸 */
.book-shell{padding:0;width:calc(100% - 152px);margin:0 auto}
.book{position:absolute;inset:12px 0 12px}
@media (max-width:820px){
  .book-shell{width:calc(100% - 10px)}
  .book{inset:6px 0 6px}
  .nav-arrow{display:none}
}

/* ---------- 横屏提示 ---------- */
.hint-rotate{
  position:fixed;left:50%;transform:translateX(-50%);bottom:58px;z-index:70;
  display:none;align-items:center;gap:10px;
  background:rgba(28,26,24,.92);color:#f0ece6;font-size:11.5px;letter-spacing:.05em;
  padding:8px 10px 8px 14px;border-radius:20px;backdrop-filter:blur(8px);
  box-shadow:0 6px 20px -6px rgba(0,0,0,.5);
}
.hint-rotate button{
  border:0;background:transparent;color:#9a938b;font-size:17px;line-height:1;
  cursor:pointer;padding:0 3px;
}
@media (max-width:820px) and (orientation:portrait){
  .hint-rotate.show{display:flex}
}

/* ---------- 放大查看 ---------- */
.zoomer{
  position:fixed;inset:0;z-index:140;background:rgba(14,13,12,.97);
  display:flex;flex-direction:column;
  opacity:0;visibility:hidden;transition:opacity .25s,visibility .25s;
}
.zoomer.open{opacity:1;visibility:visible}
.zoomer-bar{
  flex:0 0 auto;display:flex;align-items:center;justify-content:space-between;
  padding:10px 14px;color:#cfc9c1;font-size:12px;letter-spacing:.12em;
  border-bottom:1px solid rgba(255,255,255,.08);
}
.zoomer-actions{display:flex;gap:8px}
.zoomer-actions button{
  width:32px;height:32px;border:1px solid rgba(255,255,255,.18);background:transparent;
  color:#d8d2ca;border-radius:3px;cursor:pointer;font-size:16px;line-height:1;
  transition:background .18s,color .18s;
}
.zoomer-actions button:hover{background:rgba(255,255,255,.12);color:#fff}
.zoomer-body{
  flex:1;overflow:auto;display:flex;align-items:flex-start;justify-content:flex-start;
  padding:12px;-webkit-overflow-scrolling:touch;
}
.zoomer-body img{
  display:block;max-width:none;width:100%;height:auto;
  transition:width .18s ease;
  box-shadow:0 10px 40px -14px rgba(0,0,0,.9);
}