:root {
  --bg: #f7fbff;
  --surface: #fff;
  --text: #10314d;
  --muted: #5f7890;
  --line: #d9e9f6;
  --brand: #2789cf;
  --brand-strong: #1e74b2;
  --brand-soft: #eaf5ff;
  --accent: #41c47b;
  --accent-strong: #32b16c;
  --shadow: 0 10px 30px rgba(18, 38, 58, 0.08);
  --radius: 14px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body { font-family: "Inter", "Segoe UI", Arial, sans-serif; color: var(--text); background: linear-gradient(180deg, #ffffff 0%, var(--bg) 65%); }
a { color: inherit; text-decoration: none; }
.wrap { width: min(1220px, 100% - 40px); margin: 0 auto; }

.site-topbar { background: #e8f4ff; color: #2b5e86; font-size: 13px; border-bottom: 1px solid var(--line); }
.site-topbar .wrap { min-height: 36px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.header-shell { position: sticky; top: 0; z-index: 70; }

.site-header { background: rgba(255, 255, 255, .97); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.site-header .wrap { padding: 14px 0; display: grid; grid-template-columns: 230px 1fr auto; gap: 16px; align-items: center; }
.logo { font-weight: 800; color: var(--brand); font-size: 20px; }
.search input { width: 100%; border: 1px solid var(--line); border-radius: 12px; background: #f3f9ff; font-size: 14px; padding: 12px 14px; outline: none; }
.actions { display: flex; gap: 10px; }

.btn { display: inline-flex; align-items: center; justify-content: center; border-radius: 10px; padding: 10px 15px; font-size: 14px; font-weight: 600; border: 1px solid transparent; cursor: pointer; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-strong); }
.btn-outline { background: #fff; border-color: var(--line); color: var(--text); }

.main-nav { background: #fff; border-bottom: 1px solid var(--line); box-shadow: 0 1px 0 rgba(39, 137, 207, 0.05); }
.main-nav .wrap { min-height: 48px; display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.main-nav a { font-size: 14px; font-weight: 500; color: #385065; }
.main-nav a:hover, .main-nav a.active-link { color: var(--brand); font-weight: 700; }

.mega-root { position: relative; }
.mega-root > a::after { content: " ▾"; font-size: 11px; }
.mega-menu {
  position: absolute;
  top: 34px;
  left: 0;
  width: min(760px, 90vw);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  padding: 14px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: .18s ease;
  z-index: 50;
}
.mega-root:hover .mega-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.mega-col strong { display: block; margin-bottom: 8px; font-size: 13px; color: var(--brand); }
.mega-col a { display: block; margin-bottom: 6px; font-size: 13px; color: #3a4f64; }

.hero { margin-top: 16px; }
.hero-card {
  border: 1px solid var(--line);
  border-radius: 20px;
  min-height: 430px;
  background: linear-gradient(122deg, #1f7cc2, #3fa8e8);
  color: #fff;
  display: flex;
  align-items: flex-end;
  padding: 34px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}
.hero-card::before {
  content: "";
  position: absolute;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  background: rgba(255, 255, 255, .08);
  top: -140px;
  right: -120px;
}
.hero-content { position: relative; z-index: 1; max-width: 800px; }
.eyebrow { display: inline-block; margin-bottom: 14px; border-radius: 999px; padding: 7px 12px; font-size: 12px; font-weight: 700; color: #d8eafe; border: 1px solid rgba(216, 234, 254, .4); }
.hero-content h1 { margin: 0 0 10px; font-size: clamp(30px, 4.1vw, 46px); line-height: 1.15; }
.hero-content p { margin: 0 0 20px; font-size: 16px; color: #e5eff9; max-width: 720px; }
.hero-cta { display: flex; gap: 10px; flex-wrap: wrap; }

.section { padding-top: 48px; }
.section-head { margin-bottom: 20px; display: flex; align-items: end; justify-content: space-between; }
.section h2 { margin: 0; font-size: clamp(24px, 2.7vw, 32px); }
.section-subtitle { margin: 8px 0 0; color: var(--muted); font-size: 15px; }

.stats { display: grid; gap: 12px; grid-template-columns: repeat(4, minmax(0, 1fr)); }
.stat { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; box-shadow: var(--shadow); }
.stat-value { font-size: 24px; font-weight: 800; color: var(--brand); }
.stat-label { margin-top: 6px; font-size: 13px; color: var(--muted); }

.cards { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow); }
.card strong { display: block; margin-bottom: 8px; font-size: 16px; }
.card p { margin: 0 0 8px; color: var(--muted); line-height: 1.5; font-size: 14px; }

.chip-row { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 8px; }
.chip { border-radius: 999px; border: 1px solid #c6ddf2; background: var(--brand-soft); color: var(--brand-strong); font-weight: 600; font-size: 12px; padding: 5px 10px; }
.filter-chip.active-filter { background: var(--brand); border-color: var(--brand); color: #fff; }
.filter-panel { margin: 0 0 10px; }

.brands { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 12px; }
.brand { background: #fff; border: 1px solid var(--line); border-radius: 10px; text-align: center; padding: 15px 10px; font-weight: 700; color: #33485f; box-shadow: var(--shadow); }
.brand-media {
  width: 64px;
  height: 64px;
  border-radius: 12px;
  margin: 0 auto 8px;
  background: linear-gradient(135deg, #dbe9f7, #bfd4ea);
  color: #23435f;
  font-size: 24px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
}
.brand-name { font-size: 14px; }

.campaign-slider {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  box-shadow: var(--shadow);
}
.campaign-track {
  display: flex;
  gap: 10px;
  padding: 14px;
  width: max-content;
  will-change: transform;
}
.campaign-card {
  min-width: 210px;
  background: #f6f9fd;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px;
}
.campaign-media {
  width: 100%;
  height: 105px;
  border-radius: 8px;
  margin-bottom: 10px;
  background: linear-gradient(135deg, #dbe9f7, #bfd4ea);
  color: #23435f;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
}
.campaign-card strong { display: block; margin-bottom: 6px; color: #2f4860; }
.campaign-card p { margin: 0; color: var(--muted); font-size: 13px; }

.shop-layout { display: grid; grid-template-columns: 280px 1fr; gap: 14px; align-items: start; }
.category-sidebar {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 16px;
  position: sticky;
  top: 130px;
}
.sidebar-section + .sidebar-section {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid #ebf3fb;
}
.category-sidebar strong {
  display: block;
  margin-bottom: 10px;
  color: #1f5c88;
  font-size: 14px;
}
.filter-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 7px;
}
.filter-panel .chip { text-align: center; }
.filter-panel .chip:first-child { grid-column: 1 / -1; }
.category-sidebar a { display: block; padding: 8px 0; border-bottom: 1px dashed #e4ebf3; font-size: 13px; color: #3a5168; }
.category-sidebar a:last-child { border-bottom: 0; }

.detail-hero {
  margin-top: 16px;
  background: linear-gradient(135deg, #2f3f59, #344866);
  color: #fff;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  border-bottom: 1px solid rgba(10, 26, 44, 0.24);
}
.detail-hero-row {
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.detail-hero h1 {
  margin: 0;
  font-size: clamp(27px, 3vw, 38px);
}
.detail-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #d6e7fb;
  font-size: 13px;
}
.detail-main { padding-top: 24px; }
.detail-tabs-card { padding: 0; overflow: hidden; }
.detail-tabs-nav {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid #e6f0fa;
  padding: 10px 12px 0;
  background: #fbfdff;
}
.detail-tab {
  border: 0;
  background: transparent;
  color: #56728b;
  padding: 10px 12px;
  border-bottom: 2px solid transparent;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}
.detail-tab.is-active {
  color: var(--brand-strong);
  border-bottom-color: var(--brand);
}
.detail-tab-pane { display: none; padding: 18px; }
.detail-tab-pane.is-active { display: block; }
.detail-tab-layout {
  display: grid;
  grid-template-columns: minmax(280px, 360px) minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}
.detail-tab-media {
  height: 360px;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: #edf6ff;
}
.detail-tab-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.product-detail-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}
.detail-showcase {
  display: grid;
  grid-template-columns: minmax(360px, 520px) minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
}
.detail-gallery {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 10px;
  align-items: start;
}
.detail-thumb {
  width: 56px;
  height: 56px;
  border: 1px solid var(--line);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #2b4d68;
  background: linear-gradient(135deg, #e9f3ff, #cfe4f7);
}
.detail-media {
  height: 420px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #edf6ff;
  overflow: hidden;
}
.detail-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.detail-copy h2 {
  margin: 0 0 10px;
  font-size: clamp(30px, 3vw, 42px);
  line-height: 1.2;
}
.detail-copy p { font-size: 15px; line-height: 1.7; }
.detail-long-text {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid #e6f0fa;
}
.detail-side {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}
.detail-price-card {
  position: static;
  border: 1px solid #cfe2f3;
  background: linear-gradient(180deg, #ffffff, #f7fbff);
}
.detail-specs { border: 1px solid #d8e7f5; }
.detail-specs ul {
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}
.detail-specs li {
  border: 1px solid #e7f0f8;
  background: #f8fcff;
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 13px;
  color: #35526a;
}
.detail-features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
.detail-docs {
  display: grid;
  gap: 10px;
}
.detail-doc-item {
  display: block;
  border: 1px solid #dbeaf7;
  background: #f7fbff;
  border-radius: 10px;
  padding: 14px 16px;
  font-weight: 600;
  color: #295375;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.detail-doc-item:hover {
  border-color: #b8d8f2;
  background: #eef7ff;
}
.detail-doc-item small {
  font-size: 12px;
  font-weight: 700;
  color: var(--brand);
}
.detail-related { padding-top: 34px; }
.product-price { font-weight: 800; color: var(--brand); margin-top: 12px; }
.products-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.product-title {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 44px;
}
.product-desc {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 42px;
}
.product-card .chip-row { display: none; }
.products-grid.show-tags .product-card .chip-row { display: flex; }
.product-actions { margin-top: 14px; display: flex; gap: 8px; flex-wrap: nowrap; }
.product-actions .btn { flex: 1; padding: 9px 10px; font-size: 13px; }
.product-media {
  width: 100%;
  height: 185px;
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: 12px;
  background: #eef4fb;
  border: 1px solid var(--line);
}
.product-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.product-media-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 42px;
  font-weight: 800;
  color: #2f4d69;
  background: linear-gradient(135deg, #e8f3ff, #cfe6fb);
}

.site-footer { margin-top: 60px; background: #142232; color: #c6d3df; }
.site-footer .wrap { padding: 38px 0; display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 24px; }
.site-footer h4 { margin: 0 0 12px; color: #fff; }
.site-footer p, .site-footer a { color: #c6d3df; font-size: 14px; margin: 0 0 8px; }

.form-control { width: 100%; border: 1px solid var(--line); border-radius: 10px; padding: 11px 12px; font-size: 14px; }
textarea.form-control { min-height: 120px; resize: vertical; }

.cart-drawer {
  position: fixed;
  right: 0;
  top: 0;
  width: min(360px, 100%);
  height: 100vh;
  background: #fff;
  border-left: 1px solid var(--line);
  z-index: 100;
  transform: translateX(100%);
  transition: transform .25s ease;
  display: flex;
  flex-direction: column;
}
.cart-drawer.open { transform: translateX(0); }
.cart-header { display: flex; justify-content: space-between; align-items: center; padding: 14px 16px; border-bottom: 1px solid var(--line); }
.cart-header h3 { margin: 0; font-size: 18px; }
.cart-header button { border: 0; background: #eef4fb; border-radius: 8px; padding: 6px 10px; cursor: pointer; }
.cart-items { padding: 14px 16px; overflow: auto; flex: 1; }
.cart-item { border: 1px solid var(--line); border-radius: 10px; padding: 10px; margin-bottom: 8px; }
.cart-item strong { font-size: 14px; }
.cart-item p { margin: 4px 0 0; font-size: 13px; color: var(--muted); }
.cart-footer { border-top: 1px solid var(--line); padding: 14px 16px; display: grid; gap: 10px; }
.cart-backdrop { position: fixed; inset: 0; background: rgba(6, 18, 31, .36); opacity: 0; pointer-events: none; transition: opacity .2s ease; z-index: 90; }
.cart-backdrop.open { opacity: 1; pointer-events: auto; }

@media (max-width: 980px) {
  .site-header .wrap { grid-template-columns: 1fr; }
  .stats, .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .brands { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .shop-layout { grid-template-columns: 1fr; }
  .detail-hero-row { min-height: 100px; flex-direction: column; align-items: flex-start; justify-content: center; }
  .product-detail-layout, .detail-showcase { grid-template-columns: 1fr; }
  .detail-tab-layout { grid-template-columns: 1fr; }
  .detail-gallery { grid-template-columns: 1fr; }
  .detail-thumb { display: none; }
  .detail-media { height: 320px; }
  .detail-tab-media { height: 280px; }
  .detail-price-card { position: static; }
  .detail-features-grid { grid-template-columns: 1fr; }
  .products-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .main-nav { display: none; }
  .main-nav.open { display: block; }
  .category-sidebar { position: static; }
  .mega-menu { position: static; width: 100%; grid-template-columns: 1fr 1fr; opacity: 1; visibility: visible; transform: none; margin: 8px 0; display: none; }
  .mega-root:hover .mega-menu { display: grid; }
}

@media (max-width: 640px) {
  .site-topbar { display: none; }
  .hero-card { min-height: 360px; padding: 24px; }
  .stats, .cards, .brands, .site-footer .wrap, .mega-menu { grid-template-columns: 1fr; }
  .products-grid { grid-template-columns: 1fr; }
  .product-actions { flex-wrap: wrap; }
}