:root{
  --bg:#0d1020;
  --panel:#151a31;
  --panel2:#1d2442;
  --text:#f7f7fb;
  --muted:#b7bfd9;
  --accent:#7168ff;
  --accent2:#ef4c86;
  --line:rgba(255,255,255,.12);
  --shadow:0 22px 70px rgba(0,0,0,.38);
  --radius:20px;
}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;background:var(--bg);color:var(--text)}
button,a,input{font:inherit}
a{color:inherit}
button{border:0}

/* Library */
.library{min-height:100vh;background:
 radial-gradient(circle at 15% 20%,rgba(113,104,255,.24),transparent 34%),
 radial-gradient(circle at 85% 10%,rgba(239,76,134,.18),transparent 30%),
 linear-gradient(145deg,#0b0e1a,#11162c 60%,#101528)}
.library-wrap{max-width:1180px;margin:0 auto;padding:54px 24px 70px}
.brand{display:flex;align-items:center;gap:14px;margin-bottom:40px}
.brand-mark{width:48px;height:48px;border-radius:15px;background:linear-gradient(135deg,var(--accent),var(--accent2));display:grid;place-items:center;font-weight:900;box-shadow:0 12px 30px rgba(113,104,255,.27)}
.brand-copy strong{display:block;font-size:18px}.brand-copy span{display:block;color:var(--muted);font-size:13px;margin-top:3px}
.hero{max-width:850px;margin-bottom:34px}
.hero h1{font-size:clamp(36px,6vw,68px);line-height:.98;letter-spacing:-.055em;margin:0 0 18px}
.hero p{max-width:760px;color:#c9d0e8;line-height:1.65;font-size:17px;margin:0}
.book-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px;margin-top:34px}
.card{background:linear-gradient(180deg,rgba(255,255,255,.075),rgba(255,255,255,.035));border:1px solid var(--line);border-radius:26px;padding:15px;box-shadow:0 18px 55px rgba(0,0,0,.2);transition:.22s ease;display:flex;flex-direction:column;min-width:0}
.card:hover{transform:translateY(-4px);border-color:rgba(255,255,255,.24)}
.cover-frame{aspect-ratio:210/297;border-radius:18px;overflow:hidden;background:#222a47;box-shadow:0 12px 32px rgba(0,0,0,.28)}
.cover-frame img{width:100%;height:100%;object-fit:cover;display:block}
.card-body{padding:18px 6px 6px;display:flex;flex-direction:column;flex:1}
.kicker{text-transform:uppercase;letter-spacing:.12em;font-weight:800;font-size:11px;color:#b8b4ff}
.card h2{margin:9px 0 8px;font-size:22px;letter-spacing:-.025em}
.card p{margin:0;color:var(--muted);line-height:1.55;font-size:14px}
.card-actions{display:flex;gap:10px;margin-top:auto;padding-top:18px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;text-decoration:none;border-radius:12px;padding:11px 14px;background:rgba(255,255,255,.08);border:1px solid var(--line);font-weight:750;font-size:14px;cursor:pointer;color:var(--text)}
.btn.primary{background:linear-gradient(135deg,var(--accent),#8c63f5);border-color:transparent}
.btn:hover{filter:brightness(1.08)}
.library-note{margin-top:30px;border-top:1px solid var(--line);padding-top:22px;color:var(--muted);font-size:13px;line-height:1.55}

/* Viewer */
.viewer{height:100vh;overflow:hidden;background:linear-gradient(145deg,#090c16,#10162b);display:grid;grid-template-rows:auto 1fr auto}
.topbar,.bottombar{z-index:20;background:rgba(12,16,30,.9);backdrop-filter:blur(12px);border-color:var(--line);display:flex;align-items:center;gap:9px;padding:9px 12px}
.topbar{border-bottom:1px solid var(--line)}
.bottombar{border-top:1px solid var(--line);justify-content:center;flex-wrap:wrap}
.icon-btn{width:42px;height:42px;border-radius:11px;background:rgba(255,255,255,.065);color:var(--text);border:1px solid var(--line);cursor:pointer;display:grid;place-items:center;font-size:18px}
.icon-btn:hover{background:rgba(255,255,255,.12)}
.icon-btn:disabled{opacity:.35;cursor:not-allowed}
.titlebox{min-width:0;margin-right:auto}
.titlebox strong{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:14px}
.titlebox span{display:block;color:var(--muted);font-size:11px;margin-top:2px}
.viewer-shell{position:relative;min-height:0;display:flex;overflow:hidden}
.stage{position:relative;flex:1;overflow:auto;display:grid;place-items:center;padding:22px;background:
 radial-gradient(circle at 50% 15%,rgba(113,104,255,.15),transparent 28%),
 repeating-linear-gradient(135deg,rgba(255,255,255,.012) 0 1px,transparent 1px 13px)}
.book{position:relative;display:flex;align-items:center;justify-content:center;gap:2px;transform-style:preserve-3d;filter:drop-shadow(0 24px 48px rgba(0,0,0,.42));transition:opacity .12s ease}
.book.turn-next{animation:bookNext .28s ease}.book.turn-prev{animation:bookPrev .28s ease}
@keyframes bookNext{0%{transform:perspective(1600px) rotateY(0)}48%{transform:perspective(1600px) rotateY(-3.5deg) scale(.995)}100%{transform:perspective(1600px) rotateY(0)}}
@keyframes bookPrev{0%{transform:perspective(1600px) rotateY(0)}48%{transform:perspective(1600px) rotateY(3.5deg) scale(.995)}100%{transform:perspective(1600px) rotateY(0)}}
.page-slot{height:var(--page-height,70vh);aspect-ratio:210/297;background:#fff;overflow:hidden;position:relative;flex:none}
.page-slot.left{border-radius:10px 2px 2px 10px;box-shadow:inset -14px 0 20px rgba(0,0,0,.08)}
.page-slot.right{border-radius:2px 10px 10px 2px;box-shadow:inset 14px 0 20px rgba(0,0,0,.08)}
.page-slot.single{border-radius:10px;box-shadow:none}
.page-slot.blank{background:linear-gradient(90deg,#fafafa,#fff)}
.page-slot.blank::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,transparent,rgba(0,0,0,.035))}
.page-slot img{width:100%;height:100%;object-fit:contain;display:block;background:#fff;user-select:none;-webkit-user-drag:none}
.gutter{position:absolute;left:50%;top:1%;bottom:1%;width:18px;transform:translateX(-50%);pointer-events:none;background:radial-gradient(ellipse at center,rgba(0,0,0,.18),rgba(0,0,0,0) 62%);opacity:.45;z-index:2}
.page-badge{position:absolute;bottom:9px;right:10px;background:rgba(0,0,0,.58);color:#fff;border-radius:999px;padding:4px 8px;font-size:11px;pointer-events:none;opacity:.72}

.thumbs{width:0;transition:width .2s ease;overflow:hidden;background:#0e1326;border-right:1px solid var(--line);min-height:0}
.thumbs.open{width:220px}
.thumbs-inner{height:100%;width:220px;overflow:auto;padding:12px}
.thumb{display:grid;grid-template-columns:58px 1fr;align-items:center;gap:10px;width:100%;padding:7px;border-radius:10px;background:transparent;color:var(--text);cursor:pointer;text-align:left;margin-bottom:6px;border:1px solid transparent}
.thumb:hover{background:rgba(255,255,255,.06)}.thumb.active{background:rgba(113,104,255,.17);border-color:rgba(151,145,255,.34)}
.thumb img{width:58px;aspect-ratio:210/297;object-fit:cover;border-radius:5px;background:white}
.thumb span{font-size:12px;color:var(--muted)}
.page-control{display:flex;align-items:center;gap:7px;background:rgba(255,255,255,.055);border:1px solid var(--line);padding:5px 8px;border-radius:11px;color:var(--muted);font-size:12px}
.page-control input{width:50px;background:#080b15;color:#fff;border:1px solid var(--line);border-radius:7px;padding:6px 7px;text-align:center;outline:none}
.zoom-label{min-width:44px;text-align:center;color:var(--muted);font-size:12px;font-variant-numeric:tabular-nums}
.nav-main{display:flex;gap:8px}
.mobile-only{display:none}
.help-toast{position:absolute;left:50%;bottom:20px;transform:translateX(-50%);padding:9px 12px;background:rgba(5,8,16,.86);border:1px solid var(--line);border-radius:10px;color:var(--muted);font-size:12px;opacity:0;pointer-events:none;transition:.2s;z-index:30}.help-toast.show{opacity:1}

@media (max-width:900px){
 .book-grid{grid-template-columns:1fr;max-width:520px}
 .library-wrap{padding-top:30px}.hero h1{font-size:44px}
 .page-slot.left,.gutter{display:none}.page-slot.right{border-radius:10px;box-shadow:none}
 .thumbs.open{position:absolute;z-index:25;left:0;top:0;bottom:0;width:min(78vw,250px);box-shadow:20px 0 50px rgba(0,0,0,.4)}
 .thumbs-inner{width:min(78vw,250px)}
 .stage{padding:12px}
 .titlebox span{display:none}
 .hide-mobile{display:none!important}.mobile-only{display:grid}
 .bottombar{gap:6px;padding:7px}
 .icon-btn{width:40px;height:40px}
 .page-control{order:5}
}
@media (max-width:520px){
 .brand{margin-bottom:28px}.hero p{font-size:15px}.card h2{font-size:20px}
 .topbar{padding:7px}.titlebox strong{font-size:12px;max-width:48vw}
 .bottombar .zoom-label{display:none}
}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}.book.turn-next,.book.turn-prev{animation:none}}