* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  background: #f5f6f8;
  color: #171717;
}

.container {
  width: min(1100px, 92%);
  margin: auto;
}

.topbar {
  background: #111827;
  color: white;
  padding: 18px 0;
}

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

.brand {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: .5px;
}

.top-link {
  color: white;
  text-decoration: none;
  font-weight: 700;
}

.hero {
  padding: 55px 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 55px;
  align-items: center;
}

.product-image {
  background: white;
  border-radius: 24px;
  overflow: hidden;
  box-shadow: 0 12px 40px rgba(0,0,0,.08);
  min-height: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.product-image img {
  width: 100%;
  height: 480px;
  object-fit: cover;
}

.badge {
  display: inline-block;
  background: #e8eefc;
  color: #3155a6;
  padding: 8px 12px;
  border-radius: 30px;
  font-size: 12px;
  font-weight: 800;
  margin-bottom: 18px;
}

h1 {
  font-size: clamp(36px, 5vw, 58px);
  line-height: 1.02;
  margin-bottom: 20px;
}

.description {
  color: #606770;
  font-size: 18px;
  line-height: 1.6;
  margin-bottom: 24px;
}

.price {
  font-size: 38px;
  font-weight: 900;
  margin-bottom: 22px;
}

.box {
  background: white;
  border-radius: 15px;
  padding: 17px 20px;
  margin-bottom: 20px;
}

.row {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  gap: 20px;
}

.buy-button {
  display: block;
  width: 100%;
  background: #3483fa;
  color: white;
  text-align: center;
  text-decoration: none;
  padding: 19px;
  border-radius: 12px;
  font-size: 19px;
  font-weight: 800;
  transition: .2s;
}

.buy-button:hover {
  transform: translateY(-2px);
  background: #296ed4;
}

.secure {
  text-align: center;
  color: #6b7280;
  font-size: 13px;
  margin-top: 14px;
}

.details {
  background: white;
  padding: 60px 0;
}

.details h2 {
  text-align: center;
  font-size: 34px;
  margin-bottom: 30px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.card {
  border: 1px solid #e5e7eb;
  padding: 28px;
  border-radius: 18px;
}

.card span {
  font-weight: 900;
  color: #3483fa;
}

.card h3 {
  margin: 12px 0;
}

.card p {
  color: #626b78;
  line-height: 1.5;
}

footer {
  background: #111827;
  color: #cbd5e1;
  padding: 25px 0;
  text-align: center;
  font-size: 13px;
}

@media (max-width: 800px) {
  .hero {
    padding: 30px 0;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .product-image,
  .product-image img {
    min-height: 330px;
    height: 330px;
  }

  .cards {
    grid-template-columns: 1fr;
  }
}