* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: #f4f7fb;
  color: #1f2937;
}

a {
  text-decoration: none;
  color: inherit;
}

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 20px;
}

.topbar {
  background: #0f172a;
  color: #e5e7eb;
  font-size: 14px;
  padding: 10px 0;
}

.topbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar {
  background: #ffffff;
  border-bottom: 1px solid #e5e7eb;
  box-shadow: 0 2px 10px rgba(0,0,0,0.04);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 18px;
  padding-bottom: 18px;
}

.logo {
  font-size: 28px;
  font-weight: 700;
  color: #0f172a;
}

.logo span {
  color: #2563eb;
}

.nav-links {
  display: flex;
  gap: 24px;
  align-items: center;
  font-size: 15px;
  color: #374151;
}

.hero {
  background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 100%);
  color: #fff;
  padding: 70px 0 60px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 30px;
  align-items: center;
}

.hero h1 {
  margin: 0 0 18px;
  font-size: 46px;
  line-height: 1.15;
}

.hero p {
  margin: 0 0 28px;
  color: #dbeafe;
  font-size: 18px;
  line-height: 1.6;
  max-width: 720px;
}

.search-card {
  background: #ffffff;
  color: #111827;
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.18);
  padding: 26px;
}

.search-card h3 {
  margin: 0 0 10px;
  font-size: 22px;
  color: #111827;
}

.search-card p {
  margin: 0 0 18px;
  color: #6b7280;
  font-size: 14px;
}

.search-form {
  display: flex;
  gap: 12px;
}

.search-form input {
  flex: 1;
  padding: 15px 16px;
  border: 1px solid #d1d5db;
  border-radius: 12px;
  font-size: 15px;
  outline: none;
}

.search-form input:focus {
  border-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 22px;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
}

.btn-primary {
  background: #2563eb;
  color: #fff;
}

.btn-primary:hover {
  background: #1d4ed8;
}

.btn-secondary {
  background: #16a34a;
  color: #fff;
}

.btn-secondary:hover {
  background: #15803d;
}

.section {
  padding: 55px 0;
}

.section-title {
  margin: 0 0 12px;
  font-size: 32px;
  color: #0f172a;
}

.section-subtitle {
  margin: 0 0 30px;
  color: #6b7280;
  font-size: 16px;
  line-height: 1.6;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.info-card {
  background: #fff;
  border-radius: 18px;
  padding: 24px;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
  border: 1px solid #e5e7eb;
}

.info-card h3 {
  margin: 0 0 10px;
  font-size: 20px;
  color: #111827;
}

.info-card p {
  margin: 0;
  color: #6b7280;
  line-height: 1.7;
  font-size: 15px;
}

.page-wrap {
  padding: 36px 0 60px;
}

.breadcrumb {
  font-size: 14px;
  color: #6b7280;
  margin-bottom: 18px;
}

.product-layout {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr;
  gap: 26px;
}

.panel {
  background: #fff;
  border-radius: 20px;
  padding: 28px;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
  border: 1px solid #e5e7eb;
}

.product-title {
  margin: 0 0 14px;
  font-size: 38px;
  color: #0f172a;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}

.badge {
  background: #eff6ff;
  color: #1d4ed8;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
}

.content-box {
  background: #f8fafc;
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  padding: 20px;
  margin-top: 20px;
}

.content-box h3 {
  margin-top: 0;
  font-size: 22px;
  color: #0f172a;
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 18px;
}

.spec-table td {
  padding: 14px 0;
  border-bottom: 1px solid #e5e7eb;
  vertical-align: top;
}

.spec-table td:first-child {
  width: 220px;
  font-weight: 700;
  color: #111827;
}

.sidebar-card h3 {
  margin-top: 0;
  font-size: 28px;
  color: #0f172a;
}

.sidebar-card .sku {
  font-size: 15px;
  color: #6b7280;
  margin-bottom: 20px;
}

.sidebar-stack {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.quick-list {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.quick-list li {
  padding: 14px 0;
  border-bottom: 1px solid #e5e7eb;
  font-size: 15px;
}

.footer {
  background: #0f172a;
  color: #cbd5e1;
  padding: 26px 0;
  margin-top: 30px;
}

.footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.footer strong {
  color: #fff;
}

@media (max-width: 992px) {
  .hero-grid,
  .product-layout,
  .card-grid {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 34px;
  }

  .product-title {
    font-size: 30px;
  }

  .search-form {
    flex-direction: column;
  }

  .nav-links {
    display: none;
  }
}