:root{
  --navy:#0a1a43;
  --pink:#df3d83;
  --purple:#6b4fd3;
  --teal:#2e9fa3;
  --gold:#f3b43f;
  --cream:#fffaf4;
  --ink:#17203a;
  --muted:#65708a;
  --line:#e9e7ef;
  --white:#fff;
  --shadow:0 18px 50px rgba(20,31,65,.13);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:var(--ink);
  background:linear-gradient(180deg,#fff 0%,#fffdf9 65%,#faf8ff 100%);
}
a{text-decoration:none;color:inherit}
button{font:inherit}
.nav-shell{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(18px);
  border-bottom:1px solid rgba(10,26,67,.08);
}
.nav{
  max-width:1220px;margin:auto;padding:16px 22px;
  display:flex;align-items:center;justify-content:space-between;gap:20px;
}
.brand{font-weight:900;color:var(--navy);letter-spacing:-.02em}
.nav nav{display:flex;gap:24px;font-weight:700;color:#46516a}
.nav nav a:hover{color:var(--pink)}
.hero{
  position:relative;overflow:hidden;
  padding:72px 22px 82px;
  background:
    radial-gradient(circle at 5% 25%, rgba(223,61,131,.17), transparent 22%),
    radial-gradient(circle at 85% 0%, rgba(46,159,163,.16), transparent 24%),
    radial-gradient(circle at 80% 85%, rgba(243,180,63,.18), transparent 20%),
    linear-gradient(135deg,#fff 0%,#fff8fb 45%,#f5fbff 100%);
}
.hero-content{
  max-width:1220px;margin:auto;
  display:grid;grid-template-columns:1.05fr .95fr;gap:54px;align-items:center;
}
.eyebrow{
  display:inline-block;font-size:.78rem;letter-spacing:.16em;font-weight:900;
  color:var(--pink);text-transform:uppercase;
}
.hero h1{
  margin:12px 0 18px;
  color:var(--navy);
  font-size:clamp(3rem,7vw,6.4rem);
  line-height:.92;letter-spacing:-.055em;
}
.hero-copy p{
  max-width:690px;font-size:1.15rem;line-height:1.75;color:#4b5871;margin:0 0 28px;
}
.hero-actions,.book-actions{display:flex;gap:12px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  border-radius:999px;padding:12px 17px;font-weight:850;border:0;cursor:pointer;
  transition:.2s transform,.2s box-shadow,.2s background;
}
.btn:hover{transform:translateY(-2px)}
.btn.primary{
  color:#fff;background:linear-gradient(135deg,var(--pink),var(--purple));
  box-shadow:0 10px 24px rgba(107,79,211,.2);
}
.btn.secondary{
  color:var(--navy);background:#fff;border:1px solid #dfe3ee;
}
.btn.large{padding:15px 22px}
.hero-logo-card{
  position:relative;background:#fff;border-radius:32px;padding:24px;
  box-shadow:var(--shadow);border:1px solid rgba(10,26,67,.08);
  transform:rotate(1deg);
}
.hero-logo-card:after{
  content:"";position:absolute;inset:auto 18px -12px 18px;height:24px;
  background:linear-gradient(90deg,#f8c4dd,#f9d58e,#b7e5e4,#cabff6);
  filter:blur(18px);opacity:.75;z-index:-1;
}
.hero-logo-card img{width:100%;display:block;border-radius:20px}
.feature-strip{
  max-width:1120px;margin:-30px auto 70px;padding:0 22px;
  display:grid;grid-template-columns:repeat(4,1fr);gap:12px;position:relative;z-index:5;
}
.feature-strip div{
  background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px 20px;
  box-shadow:0 8px 25px rgba(25,35,70,.08);
}
.feature-strip strong{display:block;color:var(--navy);font-size:1.05rem}
.feature-strip span{display:block;color:var(--muted);font-size:.9rem;margin-top:4px}
.books-section{max-width:1220px;margin:0 auto;padding:20px 22px 92px}
.section-heading{text-align:center;max-width:760px;margin:0 auto 28px}
.section-heading h2,.about-card h2,.modal-head h2{
  color:var(--navy);font-size:clamp(2rem,4vw,3.4rem);letter-spacing:-.04em;margin:8px 0 12px;
}
.section-heading p,.about-card p,.modal-head p{color:var(--muted);line-height:1.7}
.filter-row{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-bottom:30px}
.filter{
  border:1px solid #e2e4ec;background:#fff;color:#49556e;padding:10px 15px;border-radius:999px;
  font-weight:800;cursor:pointer;
}
.filter.active{background:var(--navy);color:#fff;border-color:var(--navy)}
.book-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:22px}
.book-card{
  background:#fff;border:1px solid var(--line);border-radius:24px;overflow:hidden;
  box-shadow:0 10px 30px rgba(24,35,68,.08);transition:.22s transform,.22s box-shadow;
}
.book-card:hover{transform:translateY(-5px);box-shadow:0 18px 40px rgba(24,35,68,.14)}
.cover-wrap{aspect-ratio:4/5.4;background:#f5f6f9;overflow:hidden}
.cover-wrap img{width:100%;height:100%;object-fit:cover;display:block}
.book-info{padding:17px}
.category{
  display:inline-block;font-size:.72rem;text-transform:uppercase;font-weight:900;letter-spacing:.11em;
  color:var(--teal);margin-bottom:7px;
}
.book-info h3{margin:0 0 16px;color:var(--navy);font-size:1.02rem;line-height:1.25}
.book-actions .btn{font-size:.88rem;padding:10px 13px;flex:1}
.about-section{
  max-width:1220px;margin:0 auto 90px;padding:0 22px;
  display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:stretch;
}
.about-card{
  border-radius:30px;padding:42px;background:
  radial-gradient(circle at 100% 0,rgba(223,61,131,.13),transparent 26%),
  linear-gradient(145deg,#fff,#fff8fc);
  border:1px solid #f0e3ec;box-shadow:var(--shadow);
}
.about-art{width:100%;height:100%;object-fit:cover;border-radius:30px;box-shadow:var(--shadow)}
footer{
  border-top:1px solid var(--line);padding:28px 22px;max-width:1220px;margin:auto;
  display:flex;justify-content:space-between;gap:20px;align-items:center;color:#65708a;
}
footer strong{display:block;color:var(--navy)}
footer span{font-size:.9rem}
footer p{margin:0;font-size:.9rem}
.modal{
  position:fixed;inset:0;z-index:100;display:none;align-items:center;justify-content:center;padding:18px;
}
.modal.open{display:flex}
.modal-backdrop{position:absolute;inset:0;background:rgba(8,17,42,.72);backdrop-filter:blur(7px)}
.modal-panel{
  position:relative;z-index:1;background:#fff;border-radius:28px;width:min(1100px,96vw);max-height:92vh;
  overflow:auto;padding:28px;box-shadow:0 25px 90px rgba(0,0,0,.35);
}
.modal-close{
  position:sticky;top:0;float:right;z-index:2;width:42px;height:42px;border-radius:50%;border:0;
  background:#f1f3f7;color:var(--navy);font-size:2rem;line-height:1;cursor:pointer;
}
.modal-head{text-align:center;padding:10px 45px 20px}
.sample-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px;align-items:start;
}
.sample{
  border:1px solid var(--line);border-radius:18px;overflow:hidden;background:#fff;
}
.sample img{width:100%;display:block;background:#f6f6f8}
.sample figcaption{padding:12px 14px;font-weight:800;color:var(--navy)}
@media(max-width:980px){
  .hero-content,.about-section{grid-template-columns:1fr}
  .hero-logo-card{max-width:680px;margin:auto}
  .book-grid{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:720px){
  .nav nav{gap:14px;font-size:.9rem}
  .brand{font-size:.92rem}
  .feature-strip{grid-template-columns:1fr 1fr}
  .book-grid{grid-template-columns:repeat(2,1fr);gap:14px}
  .about-card{padding:30px}
  footer{flex-direction:column;align-items:flex-start}
}
@media(max-width:480px){
  .nav{padding:13px 14px}
  .nav nav a:nth-child(2){display:none}
  .hero{padding:48px 16px 62px}
  .hero h1{font-size:3.25rem}
  .hero-actions .btn{width:100%}
  .feature-strip{padding:0 14px}
  .books-section,.about-section{padding-left:14px;padding-right:14px}
  .book-grid{grid-template-columns:1fr 1fr}
  .book-info{padding:13px}
  .book-actions{flex-direction:column}
  .book-actions .btn{width:100%}
}

/* Full-size sample image viewer */
.sample img{cursor:zoom-in}
.image-lightbox{position:fixed;inset:0;z-index:200;display:none;align-items:center;justify-content:center;padding:18px}
.image-lightbox.open{display:flex}
.image-lightbox-backdrop{position:absolute;inset:0;background:rgba(5,12,31,.9);backdrop-filter:blur(8px)}
.image-lightbox-content{position:relative;z-index:1;display:flex;align-items:center;justify-content:center;width:100%;height:100%;pointer-events:none}
.image-lightbox img{max-width:94vw;max-height:92vh;width:auto;height:auto;object-fit:contain;border-radius:12px;box-shadow:0 24px 90px rgba(0,0,0,.5);background:#fff;pointer-events:auto;cursor:zoom-out}
.image-lightbox-close{position:absolute;z-index:2;top:max(18px,env(safe-area-inset-top));right:max(18px,env(safe-area-inset-right));width:48px;height:48px;border:0;border-radius:50%;background:#fff;color:var(--navy);font-size:2rem;line-height:1;cursor:pointer;box-shadow:0 5px 24px rgba(0,0,0,.25)}