.bk{position:absolute;inset:0;display:none;flex-direction:column;background:#2a2622;color:#f3ecdc;font-family:'Work Sans',system-ui,sans-serif;overflow:hidden;z-index:3;--paper:#fffdf7}
.bk.on{display:flex}
.bk button{font:inherit;color:inherit;cursor:pointer}
/* ---------- shelf ---------- */
.bk-shelf{flex:1;overflow:auto;padding:26px clamp(14px,4vw,48px) 44px;background:radial-gradient(1200px 500px at 50% -80px,#4a3e33 0,#2a2622 70%)}
.bk-shelf h1{font-family:'Fraunces',serif;font-weight:600;font-size:clamp(1.5rem,3vw,2.1rem);margin:0 0 4px;color:#fbf3dd}
.bk-shelf .sub{margin:0 0 22px;color:#cbbfa7;font-size:.92rem;max-width:62ch;line-height:1.5}
.bk-shelf h2{font-family:'Fraunces',serif;font-weight:500;font-size:1.05rem;margin:26px 0 12px;color:#e8c987;letter-spacing:.3px;display:flex;align-items:center;gap:10px}
.bk-shelf h2::after{content:"";flex:1;height:1px;background:rgba(232,201,135,.25)}
.bk-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:22px 18px}
.bk-cover{position:relative;aspect-ratio:3/4.1;border:0;border-radius:4px 10px 10px 4px;padding:14px 12px 12px 22px;text-align:left;background:linear-gradient(135deg,var(--c),color-mix(in srgb,var(--c) 55%,#000));color:#fff;display:flex;flex-direction:column;box-shadow:0 14px 22px -12px rgba(0,0,0,.7),inset 0 0 0 1px rgba(255,255,255,.12);transition:transform .15s}
.bk-cover::before{content:"";position:absolute;left:0;top:0;bottom:0;width:13px;border-radius:4px 0 0 4px;background:linear-gradient(90deg,rgba(0,0,0,.35),rgba(255,255,255,.1) 60%,rgba(0,0,0,.18));}
.bk-cover::after{content:"";position:absolute;right:-5px;top:4px;bottom:4px;width:5px;background:repeating-linear-gradient(180deg,#f4eddc 0 2px,#d9d0bb 2px 3px);border-radius:0 3px 3px 0}
.bk-cover:hover,.bk-cover:focus-visible{transform:translateY(-5px) rotate(-.4deg);outline:none}
.bk-cover .no{font-size:.66rem;letter-spacing:.18em;text-transform:uppercase;opacity:.8}
.bk-cover .big{font-family:'Fraunces',serif;font-size:3.1rem;line-height:1;font-weight:600;margin:6px 0 4px;opacity:.95}
.bk-cover .tt{font-family:'Fraunces',serif;font-weight:500;font-size:.98rem;line-height:1.2;margin-top:auto}
.bk-cover .mt{font-size:.7rem;opacity:.8;margin-top:6px}
.bk-cover .pr{height:3px;background:rgba(255,255,255,.28);border-radius:9px;margin-top:8px;overflow:hidden}.bk-cover .pr i{display:block;height:100%;background:#ffd36b}
/* ---------- reader ---------- */
.bk-read{flex:1;display:none;flex-direction:column;min-height:0;position:relative}
.bk-read.on{display:flex}
.bk-tb{flex:0 0 auto;display:flex;align-items:center;gap:6px;padding:6px 10px;background:#1f1b18;border-bottom:1px solid rgba(255,255,255,.08)}
.bk-tb button{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.14);border-radius:8px;padding:5px 10px;font-size:.84rem;white-space:nowrap}
.bk-tb button:hover:not(:disabled){border-color:#e8c987;color:#e8c987}
.bk-tb button:disabled{opacity:.35;cursor:default}
.bk-tb .ch{flex:1;min-width:0;text-align:left;overflow:hidden;text-overflow:ellipsis;font-family:'Fraunces',serif;font-weight:500;font-size:.95rem}
.bk-tb .ch small{opacity:.6;font-family:'Work Sans',sans-serif;font-size:.74rem;margin-left:6px}
.bk-desk{flex:1;min-height:0;overflow:auto;position:relative;display:flex;background:radial-gradient(900px 600px at 50% 40%,#3b332c 0,#26221f 80%);perspective:2200px;touch-action:pan-x pan-y pinch-zoom}
.bk-spread{margin:auto;display:flex;position:relative;padding:12px;flex:0 0 auto}
.bk-pg{position:relative;background:var(--paper);flex:0 0 auto;overflow:hidden;user-select:none;-webkit-user-select:none}
.bk-pg.l{box-shadow:-1px 0 0 #e6dfcf,-2px 1px 0 #d6cebb,-3px 2px 0 #e6dfcf,-4px 3px 0 #cfc6b1,0 14px 26px -8px rgba(0,0,0,.65);border-radius:3px 0 0 3px}
.bk-pg.r{box-shadow:1px 0 0 #e6dfcf,2px 1px 0 #d6cebb,3px 2px 0 #e6dfcf,4px 3px 0 #cfc6b1,0 14px 26px -8px rgba(0,0,0,.65);border-radius:0 3px 3px 0}
.bk-pg.s{box-shadow:0 14px 26px -8px rgba(0,0,0,.65);border-radius:3px}
.bk-pg.l::after,.bk-pg.r::after{content:"";position:absolute;top:0;bottom:0;width:7%;pointer-events:none}
.bk-pg.l::after{right:0;background:linear-gradient(90deg,transparent,rgba(60,40,10,.22))}
.bk-pg.r::after{left:0;background:linear-gradient(270deg,transparent,rgba(60,40,10,.22))}
.bk-pg img{display:block;width:100%;height:100%;-webkit-user-drag:none;pointer-events:none}
.bk-pg .ld{position:absolute;inset:0;display:grid;place-items:center;color:#a39a86;font-size:.8rem}
.bk-pg .ld i{width:26px;height:26px;border:3px solid #e1d9c6;border-top-color:#b7a67a;border-radius:50%;animation:bkspin .8s linear infinite}
@keyframes bkspin{to{transform:rotate(360deg)}}
.bk-pg .lk{position:absolute;z-index:2;border-radius:3px;background:rgba(40,110,200,0);transition:background .12s;cursor:pointer}
.bk-pg .lk:hover,.bk-pg .lk:focus-visible{background:rgba(40,110,200,.16);outline:none}
.bk-pg .lk.x{background:rgba(214,120,20,.0)}.bk-pg .lk.x:hover{background:rgba(214,120,20,.22)}
.bk-pg .hit{position:absolute;z-index:1;background:rgba(255,214,0,.5);border-radius:2px;mix-blend-mode:multiply;animation:bkhit 6s forwards}
@keyframes bkhit{0%,80%{opacity:1}100%{opacity:0}}
.bk-pg .no{position:absolute;bottom:.6%;font-size:11px;color:#9a917c;pointer-events:none}
.bk-flipN .bk-pg.r,.bk-flipN .bk-pg.s{animation:bkfN .42s ease-out;transform-origin:left center}
.bk-flipP .bk-pg.l,.bk-flipP .bk-pg.s{animation:bkfP .42s ease-out;transform-origin:right center}
.bk-flipN .bk-pg.l,.bk-flipP .bk-pg.r{animation:bkfade .3s ease-out}
@keyframes bkfN{from{transform:rotateY(-62deg);filter:brightness(.8)}to{transform:none;filter:none}}
@keyframes bkfP{from{transform:rotateY(62deg);filter:brightness(.8)}to{transform:none;filter:none}}
@keyframes bkfade{from{opacity:.5}to{opacity:1}}
.bk-edge{position:absolute;top:0;bottom:0;width:11%;z-index:4;background:none;border:0;opacity:0;transition:opacity .15s}
.bk-edge:hover{opacity:1}.bk-edge.p{left:0;background:linear-gradient(90deg,rgba(255,255,255,.12),transparent)}.bk-edge.n{right:0;background:linear-gradient(270deg,rgba(255,255,255,.12),transparent)}
.bk-edge span{position:absolute;top:50%;transform:translateY(-50%);font-size:2.2rem;color:#fff;text-shadow:0 1px 6px #000}.bk-edge.p span{left:10px}.bk-edge.n span{right:10px}
@media (hover:none){.bk-edge{display:none}}
.bk-bt{flex:0 0 auto;display:flex;align-items:center;gap:10px;padding:6px 14px;background:#1f1b18;border-top:1px solid rgba(255,255,255,.08);font-size:.8rem}
.bk-bt input{flex:1;accent-color:#e8c987}.bk-bt .pgno{min-width:110px;text-align:center;color:#d8cdb4}
.bk-bt button{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.14);border-radius:8px;padding:4px 12px}
.bk-bt button:disabled{opacity:.35}
/* ---------- drawer ---------- */
.bk-dr{position:absolute;top:0;bottom:0;left:0;width:min(380px,92vw);background:#fbf7ec;color:#2a2622;z-index:20;transform:translateX(-102%);transition:transform .22s ease;display:flex;flex-direction:column;box-shadow:8px 0 30px rgba(0,0,0,.5)}
.bk-dr.on{transform:none}
.bk-dr .hd{display:flex;gap:6px;padding:10px 12px;border-bottom:1px solid #e4dcc8;align-items:center}
.bk-dr .hd b{flex:1;font-family:'Fraunces',serif;font-weight:600;font-size:1.05rem}
.bk-dr .hd button{background:none;border:1px solid #d6cdb6;border-radius:8px;padding:4px 10px;color:#2a2622}
.bk-dr .tabs2{display:flex;border-bottom:1px solid #e4dcc8}
.bk-dr .tabs2 button{flex:1;background:none;border:0;padding:10px 4px;font-weight:600;font-size:.84rem;color:#6b6252;border-bottom:3px solid transparent}
.bk-dr .tabs2 button.on{color:#2a2622;border-color:var(--c,#b7791f)}
.bk-dr .body{flex:1;overflow:auto;padding:6px 0 30px}
.bk-toc a{display:flex;gap:8px;align-items:baseline;padding:7px 14px;color:#2a2622;text-decoration:none;font-size:.9rem;line-height:1.3;cursor:pointer;border-left:4px solid transparent}
.bk-toc a:hover{background:#f1e9d3}.bk-toc a.cur{background:#f6ecce;border-left-color:var(--c,#b7791f);font-weight:600}
.bk-toc a .t{flex:0 1 auto}.bk-toc a .d{flex:1;border-bottom:1px dotted #b9ae94;transform:translateY(-3px);min-width:10px}.bk-toc a .p{color:#7a705d;font-variant-numeric:tabular-nums;font-size:.82rem}
.bk-toc a.l2{padding-left:30px;font-size:.84rem;color:#4a4235}.bk-toc a.l3{padding-left:46px;font-size:.8rem;color:#5d5444}
.bk-toc .map{margin:6px 12px 8px;padding:9px 12px;border-radius:10px;background:var(--c);color:#fff;font-weight:600;border-left:0}
.bk-toc .map:hover{background:var(--c);filter:brightness(1.1)}
.bk-chs a{padding:9px 14px}.bk-chs a .n{width:26px;height:26px;border-radius:50%;background:var(--c);color:#fff;display:grid;place-items:center;font-size:.78rem;font-weight:600;flex:0 0 auto}
.bk-sr{padding:10px 12px}.bk-sr input[type=search]{width:100%;padding:9px 11px;border:1px solid #d6cdb6;border-radius:9px;font:inherit;background:#fff}
.bk-sr label{font-size:.8rem;color:#6b6252;display:inline-flex;gap:5px;align-items:center;margin:8px 10px 0 0}
.bk-sr .res a{display:block;padding:8px 4px;border-bottom:1px solid #ece4cf;color:#2a2622;text-decoration:none;font-size:.85rem;cursor:pointer}
.bk-sr .res a:hover{background:#f6ecce}.bk-sr .res small{display:block;color:#7a705d;font-size:.72rem}
.bk-sr mark{background:#ffe27a;padding:0 1px}
.bk-sh{position:absolute;inset:0;background:rgba(0,0,0,.45);z-index:19;display:none}.bk-sh.on{display:block}
.bk-wm{position:absolute;inset:0;pointer-events:none;z-index:6}
.bk-msg{margin:auto;text-align:center;color:#d8cdb4;padding:20px}
/* ---------- infographic page (designed at 794 x 1123 px) ---------- */
.ig{position:absolute;left:0;top:0;width:794px;height:1123px;transform-origin:0 0;background:#fffdf7;color:#26211b;font-family:'Work Sans',sans-serif;overflow:hidden;--c:#1b4b8f}
.ig *{box-sizing:border-box}
.ig .hdr{height:232px;padding:32px 44px 0;background:linear-gradient(120deg,var(--c),color-mix(in srgb,var(--c) 60%,#000));color:#fff;position:relative;overflow:hidden}
.ig .hdr::before{content:"";position:absolute;right:-70px;top:-70px;width:300px;height:300px;border-radius:50%;border:34px solid rgba(255,255,255,.1)}
.ig .hdr::after{content:"";position:absolute;right:60px;top:60px;width:150px;height:150px;border-radius:50%;border:12px solid rgba(255,255,255,.12)}
.ig .eyebrow{font-size:12px;letter-spacing:.28em;text-transform:uppercase;opacity:.85}
.ig .bn{position:absolute;right:48px;top:24px;font-family:'Fraunces',serif;font-size:120px;font-weight:600;line-height:1;opacity:.22}
.ig h1{font-family:'Fraunces',serif;font-weight:600;font-size:40px;line-height:1.06;margin:8px 0 8px;max-width:600px;position:relative}
.ig .tag{font-size:15.5px;line-height:1.35;max-width:600px;opacity:.95;position:relative}
.ig .stats{position:absolute;left:44px;bottom:14px;display:flex;gap:28px;font-size:14px;opacity:.9}.ig .stats b{font-size:20px;margin-right:4px}
.ig .sec{padding:0 40px}
.ig .st{display:flex;align-items:center;gap:10px;font-family:'Fraunces',serif;font-size:19px;font-weight:600;margin:12px 0 7px;color:var(--c)}
.ig .st::after{content:"";flex:1;height:2px;background:linear-gradient(90deg,var(--c),transparent);opacity:.35}
.ig .path{display:grid;grid-template-columns:repeat(3,1fr);gap:9px 11px;position:relative}
.ig .nd{position:relative;display:block;text-align:left;padding:7px 8px 6px 42px;min-height:62px;border:1px solid #e8dfc9;border-radius:12px;background:#fffaf0;cursor:pointer;color:inherit;font:inherit;transition:transform .12s,box-shadow .12s}
.ig .nd:hover{transform:translateY(-2px);box-shadow:0 8px 14px -8px rgba(0,0,0,.4);border-color:var(--c)}
.ig .nd .nn{position:absolute;left:8px;top:9px;width:28px;height:28px;border-radius:50%;background:var(--c);color:#fff;display:grid;place-items:center;font-weight:600;font-size:14px}
.ig .nd b{display:block;font-size:15px;line-height:1.2;color:#1f1a14}
.ig .nd span:not(.nn){display:block;font-size:12.2px;line-height:1.25;color:#6a6152;margin-top:2px}
.ig .nd i{position:absolute;right:7px;top:5px;font-style:normal;font-size:10.5px;color:var(--c);font-weight:600}
.ig .fm{display:grid;grid-template-columns:repeat(4,1fr);gap:9px}
.ig .fc{border-radius:12px;background:color-mix(in srgb,var(--c) 7%,#fff);border:1px solid color-mix(in srgb,var(--c) 22%,#fff);padding:7px 6px 6px;text-align:center;min-height:66px;display:flex;flex-direction:column;justify-content:center}
.ig .fc small{display:block;font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:#6a6152;margin-bottom:3px}
.ig .fc .k{font-size:17px;line-height:1.2;overflow:hidden}.ig .fc .k .katex{font-size:1em}
.ig .bot{display:grid;grid-template-columns:1.35fr 1fr;gap:16px;margin-top:2px}
.ig .tp{list-style:none;margin:0;padding:0;display:grid;gap:7px}
.ig .tp li{position:relative;padding:6px 9px 6px 32px;border-radius:10px;background:#fff6dc;font-size:12.6px;line-height:1.28;border:1px solid #f0dfa6}
.ig .tp li::before{content:"\2605";position:absolute;left:11px;top:6px;color:#d49a00;font-size:14px}
.ig .cn{display:flex;flex-wrap:wrap;gap:7px}
.ig .cn button{border:1px solid color-mix(in srgb,var(--c) 40%,#fff);background:#fff;border-radius:999px;padding:5px 11px;font-size:12.6px;color:var(--c);font-weight:600;cursor:pointer}
.ig .cn button:hover{background:var(--c);color:#fff}
.ig .cn p{margin:0;font-size:12.5px;color:#8a806c}
.ig .start{margin-top:10px;display:block;width:100%;border:0;border-radius:12px;padding:10px;background:var(--c);color:#fff;font-weight:600;font-size:15px;cursor:pointer}
.ig .ft{position:absolute;bottom:8px;left:0;right:0;text-align:center;font-size:11px;color:#9a917c}
@media (max-width:520px){.bk-bt button{white-space:nowrap;padding:4px 8px}.bk-bt .pgno{min-width:70px}.bk-tb .hide-s{display:none}.bk-grid{grid-template-columns:repeat(2,1fr)}}