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

/* Body */
body {
  font-family: Arial, sans-serif;
  background: #f8fafc;
  color: #111827;
}

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px 60px;
  background: #0f172a;
  color: white;
  position: sticky;
  top: 0;
}

.logo {
  font-size: 1.8rem;
  font-weight: bold;
  letter-spacing: 1px;
}

.nav {
  display: flex;
  gap: 30px;
}

.nav a {
  color: white;
  text-decoration: none;
  font-size: 1rem;
  transition: 0.3s;
}

.nav a:hover {
  color: #38bdf8;
}

/* Section */
.product-section {
  padding: 60px 30px;
}

.product-container {
  max-width: 1250px;
  margin: auto;
  display: flex;
  gap: 60px;
  align-items: center;
}

/* Gallery */
.product-gallery {
  flex: 1;
  position: relative;
}

.badge {
  position: absolute;
  top: 20px;
  left: 20px;
  background: #ef4444;
  color: white;
  padding: 8px 16px;
  border-radius: 30px;
  font-size: 0.9rem;
  font-weight: bold;
  z-index: 10;
}

.main-image {
  width: 100%;
  height: 520px;
  object-fit: cover;
  border-radius: 24px;
  box-shadow: 0 15px 35px rgba(0,0,0,0.12);
}

.thumbnails {
  display: flex;
  gap: 15px;
  margin-top: 22px;
  justify-content: center;
}

.thumbnails img {
  width: 90px;
  height: 90px;
  object-fit: cover;
  border-radius: 14px;
  cursor: pointer;
  border: 2px solid transparent;
  transition: 0.3s ease;
}

.thumbnails img:hover {
  transform: translateY(-5px);
  border-color: #0f172a;
}

/* Details */
.product-details {
  flex: 1;
  background: white;
  padding: 40px;
  border-radius: 28px;
  box-shadow: 0 15px 35px rgba(0,0,0,0.08);
}

.category {
  color: #2563eb;
  font-weight: bold;
  margin-bottom: 10px;
}

.product-details h1 {
  font-size: 2.6rem;
  margin-bottom: 10px;
}

.brand {
  color: #64748b;
  margin-bottom: 20px;
}

.ratings {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.ratings span {
  font-size: 1.1rem;
}

.ratings p {
  color: #64748b;
}

/* Price */
.price-box {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-bottom: 25px;
}

.current-price {
  font-size: 2rem;
  font-weight: bold;
  color: #16a34a;
}

.old-price {
  text-decoration: line-through;
  color: #94a3b8;
  font-size: 1.1rem;
}

.discount {
  background: #dcfce7;
  color: #15803d;
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: bold;
}

/* Description */
.description {
  font-size: 1rem;
  color: #475569;
  line-height: 1.8;
  margin-bottom: 30px;
}

/* Size */
.size-section h3,
.quantity-section h3 {
  margin-bottom: 14px;
  font-size: 1.1rem;
}

.sizes {
  display: flex;
  gap: 12px;
  margin-bottom: 30px;
}

.sizes button {
  padding: 12px 18px;
  border: 1px solid #cbd5e1;
  background: white;
  border-radius: 12px;
  cursor: pointer;
  font-size: 1rem;
  transition: 0.3s;
}

.sizes button:hover {
  background: #0f172a;
  color: white;
}

/* Quantity */
.quantity-box {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-bottom: 30px;
}

.quantity-box button {
  width: 45px;
  height: 45px;
  border: none;
  background: #0f172a;
  color: white;
  font-size: 1.2rem;
  border-radius: 12px;
  cursor: pointer;
}

.quantity-box input {
  width: 70px;
  text-align: center;
  font-size: 1rem;
  padding: 10px;
  border: 1px solid #cbd5e1;
  border-radius: 12px;
}

/* Buttons */
.action-buttons {
  display: flex;
  gap: 15px;
  margin-bottom: 30px;
}

.add-cart,
.buy-now {
  flex: 1;
  padding: 16px;
  border: none;
  font-size: 1rem;
  font-weight: bold;
  border-radius: 14px;
  cursor: pointer;
  transition: 0.3s;
}

.add-cart {
  background: #0f172a;
  color: white;
}

.add-cart:hover {
  background: #020617;
}

.buy-now {
  background: #2563eb;
  color: white;
}

.buy-now:hover {
  background: #1d4ed8;
}

/* Offer */
.offer-box {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  padding: 20px;
  border-radius: 18px;
}

.offer-box h4 {
  margin-bottom: 8px;
  color: #1d4ed8;
}

.offer-box p {
  color: #334155;
}

/* Responsive */
@media (max-width: 950px) {
  .product-container {
    flex-direction: column;
  }

  .main-image {
    height: 380px;
  }

  .header {
    flex-direction: column;
    gap: 15px;
    padding: 20px;
  }

  .nav {
    flex-wrap: wrap;
    justify-content: center;
  }

  .product-details h1 {
    font-size: 2rem;
  }

  .action-buttons {
    flex-direction: column;
  }
}