:root{
  --blue:#0a3d7c;
  --blue2:#082f5a;
  --bg:#ffffff;
  --muted:#f4f6f9;
  --text:#1f1f1f;
  --soft:#666;
  --amazon:#ff9900;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family: Arial, Helvetica, sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
}
a{color:inherit}
.container{max-width:1100px;margin:0 auto;padding:0 20px}
.hero{
  background: linear-gradient(135deg, var(--blue) 0%, var(--blue2) 100%);
  color:#fff;
  padding:72px 0 86px 0;
}
.hero-grid{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:42px;
}
.hero h1{font-size:38px;line-height:1.18;margin:0 0 12px 0}
.hero h2{font-size:22px;font-weight:400;opacity:.95;margin:0 0 22px 0}
.hero p{font-size:18px;max-width:560px;margin:0 0 18px 0}
.hero .author{font-weight:700;margin-top:6px}
.btns{display:flex;gap:14px;flex-wrap:wrap;margin-top:18px}
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:14px 22px;
  border-radius:12px;
  font-size:17px;
  font-weight:800;
  text-decoration:none;
  box-shadow:0 6px 18px rgba(0,0,0,.12);
}
.btn-amazon{background:var(--amazon);color:#111}
.btn-secondary{background:rgba(255,255,255,.15);color:#fff;box-shadow:none;border:1px solid rgba(255,255,255,.22)}
.badge-a{
  width:28px;height:28px;border-radius:50%;
  background:#111;color:var(--amazon);
  display:flex;align-items:center;justify-content:center;
  font-weight:900;
}
.book-wrap{flex:1;min-width:280px;text-align:center}
.book-wrap img{
  max-width:380px;width:100%;height:auto;
  border-radius:10px;
  box-shadow:0 18px 40px rgba(0,0,0,.35);
}
.section{padding:54px 0}
.section h3{color:var(--blue);font-size:26px;margin:0 0 10px 0}
.divider{height:4px;width:80px;background:var(--blue);margin:12px 0 26px 0}
.card{
  background:var(--muted);
  padding:22px;
  border-radius:14px;
}
.card + .card{margin-top:18px}
.card h4{margin:0 0 10px 0;color:var(--blue);font-size:20px}
.ul{margin:10px 0 12px 20px;font-size:17px;color:#2b2b2b}
.mini{font-size:13px;color:var(--soft);margin-top:14px}
.buy-btns{display:flex;gap:14px;flex-wrap:wrap;margin-top:12px}
.btn-site{background:var(--blue);color:#fff}
.badge-home{
  width:28px;height:28px;border-radius:50%;
  background:rgba(255,255,255,.2);color:#fff;
  display:flex;align-items:center;justify-content:center;
  font-weight:900;
}
.box{
  background:#f9fafb;border:1px solid #e6e8ee;
  padding:18px;border-radius:12px;
}
pre{
  margin:0;white-space:pre-wrap;
  font-family: Arial, Helvetica, sans-serif;
  font-size:16px;line-height:1.55;color:#2b2b2b;
}
footer{
  background:var(--muted);
  padding:28px 0;
  text-align:center;
  font-size:14px;
  color:#555;
}
footer strong{color:var(--blue)}
@media (max-width:720px){
  .hero{padding:54px 0 64px 0}
  .hero h1{font-size:32px}
  .hero h2{font-size:20px}
}