:root{
  --blue:#2563eb;
  --blue-dark:#102a56;
  --blue-soft:#eef7ff;
  --blue-card:#f7fbff;
  --ink:#0d1b2f;
  --muted:#5f7189;
  --line:#d8e8f6;
  --card:#ffffff;
  --shadow:0 16px 38px rgba(33,92,145,.10);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Inter,Arial,Helvetica,sans-serif;
  color:var(--ink);
  background:linear-gradient(180deg,#fff 0%,#f1f8ff 52%,#eaf5ff 100%);
  line-height:1.55;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%;height:auto}
.site-header{
  position:sticky;
  top:0;
  z-index:30;
  min-height:72px;
  padding:0 clamp(18px,4vw,56px);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  background:rgba(255,255,255,.94);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(14px);
}
.brand{display:flex;align-items:center;gap:12px;font-size:20px;font-weight:900;color:var(--blue-dark);white-space:nowrap}
.brand-mark{width:42px;height:42px;border-radius:12px;display:grid;place-items:center;color:#fff;background:linear-gradient(135deg,#2f80ed,#1f5ed8);box-shadow:0 10px 24px rgba(37,99,235,.24)}
.main-nav{display:flex;align-items:center;justify-content:center;gap:24px;flex:1;font-weight:800;color:#263a57}
.main-nav a:hover{color:var(--blue)}
.header-button,.primary-button,.ghost-button{
  display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 22px;border-radius:999px;font-weight:900;white-space:nowrap
}
.header-button,.primary-button{color:#fff;background:var(--blue);box-shadow:0 12px 26px rgba(37,99,235,.22)}
.ghost-button{color:var(--blue);border:1px solid #9bc8ff;background:#fff}
main{max-width:1220px;margin:0 auto;padding:34px 24px 0}
.hero{
  margin-bottom:54px;
  padding:clamp(48px,7vw,86px) clamp(24px,6vw,78px);
  border:1px solid var(--line);
  border-radius:34px;
  background:radial-gradient(circle at 88% 16%,rgba(37,99,235,.16) 0 15%,transparent 16%),radial-gradient(circle at 12% 80%,rgba(14,165,233,.14) 0 16%,transparent 17%),linear-gradient(135deg,#fff 0%,#edf7ff 100%);
  box-shadow:var(--shadow);
}
.eyebrow,.section-kicker{margin:0 0 10px;color:var(--blue);font-size:13px;font-weight:900;letter-spacing:.12em;text-transform:uppercase}
.hero h1{max-width:850px;margin:0;color:var(--ink);font-size:clamp(44px,7vw,78px);line-height:.98;letter-spacing:-.045em}
.hero-copy{max-width:720px;margin:20px 0 28px;color:var(--muted);font-size:19px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px}
.products,.categories,.guide{margin-bottom:58px}
.products h2,.categories h2,.guide h2{margin:0 0 22px;text-align:center;font-size:clamp(30px,4.6vw,50px);line-height:1.08;letter-spacing:-.035em;color:var(--ink)}
.products .section-kicker,.categories .section-kicker{text-align:center}
.product-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}
.product-card{
  overflow:hidden;
  min-width:0;
  border:1px solid var(--line);
  border-radius:16px;
  background:#fff;
  box-shadow:0 14px 32px rgba(30,86,140,.08);
  transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease;
}
.product-card:hover{transform:translateY(-3px);border-color:#a8d3ff;box-shadow:0 20px 40px rgba(30,86,140,.14)}
.product-card img{width:100%;height:178px;object-fit:cover;background:#f6fbff}
.product-card strong{display:block;min-height:58px;padding:15px 16px 4px;font-size:16px;line-height:1.25;color:#07172b}
.product-card em{display:block;padding:0 16px 16px;color:#008552;font-style:normal;font-size:20px;font-weight:900}
.category-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.category-grid a{
  min-height:96px;
  display:flex;
  align-items:center;
  gap:16px;
  padding:18px 20px;
  border:1px solid var(--line);
  border-radius:18px;
  background:rgba(255,255,255,.92);
  box-shadow:0 12px 28px rgba(30,86,140,.07);
  color:#09203b;
  font-weight:900;
}
.category-grid img{width:48px;height:48px;object-fit:contain;filter:drop-shadow(0 8px 10px rgba(37,99,235,.10))}
.guide{
  display:grid;
  grid-template-columns:.9fr 1.1fr;
  gap:28px;
  align-items:start;
  padding:34px;
  border:1px solid var(--line);
  border-radius:28px;
  background:#fff;
  box-shadow:var(--shadow);
}
.guide h2{text-align:left;margin:0}
.guide-copy p{margin:0 0 14px;color:#52677e;font-size:17px}
.footer{
  margin-top:42px;
  padding:36px 24px;
  text-align:center;
  border-top:1px solid var(--line);
  background:#eaf5ff;
  color:#50677f;
}
.footer strong{display:block;margin-bottom:10px;color:#0b3874;font-size:20px}
.footer p{max-width:980px;margin:0 auto 12px}
.footer a{color:var(--blue);font-weight:900}
@media(max-width:980px){
  .site-header{flex-wrap:wrap;padding:14px 18px}
  .main-nav{order:3;flex-basis:100%;justify-content:flex-start;gap:18px;overflow:auto}
  .product-grid,.category-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .guide{grid-template-columns:1fr}
}
@media(max-width:640px){
  .site-header{gap:12px}
  .brand{font-size:18px}
  .header-button{width:100%}
  main{padding:22px 14px 0}
  .hero{border-radius:24px;padding:38px 20px}
  .hero h1{font-size:40px}
  .hero-copy{font-size:17px}
  .primary-button,.ghost-button{width:100%}
  .product-grid,.category-grid{grid-template-columns:minmax(0,1fr)}
  .product-card img{height:190px}
  .category-grid a{min-height:82px}
  .guide{padding:22px;border-radius:22px}
}