/* ============== TOKENS (matched to Nav.css) ============== */
/*:root{
  --bg:#fafaf7;
  --fg:#1a2740;
  --muted:#5a6478;
  --primary:#16325c;
  --accent:#f07a1f;
  --accent-2:#f5a142;
  --card:#ffffff;
  --footer-bg:#0e1c36;
  --border:rgba(20,30,60,.08);
  --glass-bg:rgba(255,255,255,.6);
  --glass-border:rgba(255,255,255,.4);
  --shadow-lg:0 20px 60px -20px rgba(20,40,80,.25);
  --shadow-glass:0 10px 40px -10px rgba(20,40,80,.18), inset 0 1px 0 rgba(255,255,255,.6);
  --radius:16px;
  --ease:cubic-bezier(.22,1,.36,1);
}
:root[data-theme="dark"]{
  --bg:#0b1220; --fg:#e8ecf5; --muted:#8a93a8; --primary:#e8ecf5;
  --accent:#ff8a3d; --accent-2:#ffb066; --card:#131c30;
  --border:rgba(255,255,255,.08);
  --glass-bg:rgba(20,30,55,.55); --glass-border:rgba(255,255,255,.08);
  --shadow-glass:0 10px 40px -10px rgba(0,0,0,.5), inset 0 1px 0 rgba(255,255,255,.08);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--fg);
  font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","Helvetica Neue",Helvetica,Arial,sans-serif;
  -webkit-font-smoothing:antialiased;line-height:1.55;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.container{max-width:1180px;margin:0 auto;padding:0 1.5rem}
.kicker{
  text-transform:uppercase;letter-spacing:.18em;font-size:.78rem;
  font-weight:600;color:var(--accent);margin:0 0 1rem
}
.lede{font-size:1.1rem;color:var(--muted);max-width:60ch;margin:.4rem 0 0}
h1{font-size:clamp(2.2rem,5vw,3.6rem);line-height:1.05;letter-spacing:-.03em;margin:0;color:var(--primary)}

.glass{
  background:var(--glass-bg);
  backdrop-filter:saturate(180%) blur(22px);
  -webkit-backdrop-filter:saturate(180%) blur(22px);
  border:1px solid var(--glass-border);
  box-shadow:var(--shadow-glass);
} =======*/

/* ============ HERO ============ */
.books-hero{
  padding:90px 0 40px;
  background:
    radial-gradient(1100px 500px at 90% -10%, rgba(240,122,31,.18), transparent 60%),
    radial-gradient(900px 500px at -10% 10%, rgba(22,50,92,.18), transparent 60%),
    var(--bg);
  border-bottom:1px solid var(--border);
}

.toolbar{
  margin-top:2rem;display:flex;flex-wrap:wrap;gap:1rem;align-items:center;justify-content:space-between
}
.search{
  position:relative;flex:1 1 320px;max-width:480px;
  background:var(--card);border:1px solid var(--border);border-radius:999px;
  display:flex;align-items:center;padding:.55rem 1rem;gap:.6rem;
  box-shadow:0 6px 18px -10px rgba(20,40,80,.2);
}
.search svg{width:18px;height:18px;color:var(--muted);flex:0 0 auto}
.search input{
  border:none;outline:none;background:transparent;color:var(--fg);
  font:inherit;width:100%;
}
.filters{display:flex;flex-wrap:wrap;gap:.5rem}
.chip{
  appearance:none;border:1px solid var(--border);background:var(--card);color:var(--fg);
  padding:.5rem .95rem;border-radius:999px;font:inherit;font-size:.9rem;
  cursor:pointer;transition:all .25s var(--ease);
}
.chip:hover{transform:translateY(-1px);border-color:var(--accent)}
.chip.is-active{
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  color:#fff;border-color:transparent;
  box-shadow:0 8px 20px -10px rgba(240,122,31,.6);
}

/* ============ GRID ============ */
.books-main{padding:3rem 1.5rem 5rem}
.grid{
  display:grid;gap:1.6rem;
  grid-template-columns:repeat(auto-fill,minmax(220px,1fr));
}
.empty{text-align:center;color:var(--muted);padding:3rem 0}

.card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  overflow:hidden;display:flex;flex-direction:column;
  box-shadow:0 10px 30px -18px rgba(20,40,80,.25);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease);
}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.card-img{
  aspect-ratio:3/4;position:relative;overflow:hidden;
  background:linear-gradient(135deg,var(--primary),#24477a);
  color:#fff;display:flex;align-items:flex-end;padding:1rem;
}
.card-img img{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  transition:transform .6s var(--ease);
}
.card:hover .card-img img{transform:scale(1.06)}
.card-img::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,transparent 40%,rgba(10,18,40,.7));
}
.card-tag{
  position:absolute;top:.8rem;left:.8rem;z-index:2;
  background:rgba(255,255,255,.92);color:var(--primary);
  font-size:.7rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;
  padding:.3rem .6rem;border-radius:999px;
}
.card-body{padding:1.25rem 1.5rem 1.5rem;display:flex;flex-direction:column;gap:.35rem;flex:1}
.card-body h2{font-size:1.2rem;font-weight:700;color:var(--primary);margin:0;line-height:1.25}
.meta{display:flex;flex-wrap:wrap;gap:0.25rem 1rem;font-size:0.875rem;color:var(--muted);margin-bottom:0.5rem;}
.desc{font-size:.85rem;color:var(--muted);margin:.4rem 0 0;display:-webkit-box;-webkit-box-orient:vertical;overflow:hidden}
.card-actions{display:flex;gap:.5rem;margin-top:1rem}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.4rem;
  border:none;border-radius:999px;padding:.55rem 1rem;
  font:inherit;font-size:.85rem;font-weight:600;cursor:pointer;
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),background .2s var(--ease);
  text-decoration:none;
}
.btn svg{width:16px;height:16px}
.btn--accent{
  background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;
  box-shadow:0 10px 24px -12px rgba(240,122,31,.7);
}
.btn--accent:hover{transform:translateY(-2px);box-shadow:0 14px 28px -12px rgba(240,122,31,.8)}
.btn--ghost{
  background:transparent;color:var(--fg);border:1px solid var(--border);
}
.btn--ghost:hover{background:rgba(20,30,60,.05);border-color:var(--accent)}
.btn--block{flex:1}

/* ============ READER MODAL ============ */
.reader{position:fixed;inset:0;z-index:200;display:flex;align-items:center;justify-content:center;padding:2vh 2vw}
.reader[hidden]{display:none}
.reader__backdrop{position:absolute;inset:0;background:rgba(8,14,30,.65);backdrop-filter:blur(6px);animation:fade .3s var(--ease)}
.reader__panel{
  position:relative;width:min(1100px,100%);height:96vh;
  border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;
  background:var(--card);
  animation:rise .4s var(--ease);
}
.reader__bar{
  display:flex;justify-content:space-between;align-items:center;gap:1rem;
  padding:1rem 1.25rem;border-bottom:1px solid var(--border);
}
.reader__meta h2{margin:0;font-size:1.1rem;color:var(--primary)}
.reader__meta p{margin:.15rem 0 0;font-size:.85rem;color:var(--muted)}
.reader__actions{display:flex;gap:.5rem;align-items:center}
.reader__viewport{flex:1;background:#1a1a1a}
.reader__viewport iframe{width:100%;height:100%;border:0;background:#fff}

@keyframes fade{from{opacity:0}to{opacity:1}}
@keyframes rise{from{opacity:0;transform:translateY(20px) scale(.98)}to{opacity:1;transform:none}}

@media (max-width:560px){
  .books-hero{padding-top:70px}
  .reader__panel{height:100vh;border-radius:0}
  .reader{padding:0}
  .card-actions{flex-direction:column}
}