body {
  font-family: 'Segoe UI', Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f7faf7;
  color: #222;
}

/* Header styles */
header {
  text-align: center;
  padding: 32px 10px 16px 10px;
  background: #e6f9ea;
}

/* Navigation styles for product pages */
.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo img {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid #7ed957;
}

.logo span {
  font-size: 1.5em;
  font-weight: bold;
  color: #388e3c;
}

.nav-menu {
  display: flex;
  list-style: none;
  padding: 0;
  margin: 0;
  gap: 24px;
}

.nav-menu a {
  text-decoration: none;
  color: #222;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 6px;
  transition: background 0.2s;
}

.nav-menu a:hover {
  background: #b2f2c7;
  color: #1b5e20;
}

/* Avatar for main pages */
.avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid #7ed957;
  margin-bottom: 12px;
}

h1 {
  margin: 0 0 8px 0;
  font-size: 2.2em;
  color: #388e3c;
}

.slogan {
  font-size: 1.1em;
  color: #388e3c;
  margin-bottom: 18px;
}

nav ul {
  list-style: none;
  padding: 0;
  margin: 0 0 12px 0;
  display: flex;
  justify-content: center;
  gap: 18px;
}

nav a {
  text-decoration: none;
  color: #222;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 4px;
  transition: background 0.2s;
}

nav a:hover {
  background: #b2f2c7;
  color: #1b5e20;
}

.zalo-btn {
  display: inline-block;
  margin-top: 8px;
  background: #25d366;
  color: #fff;
  font-weight: bold;
  padding: 10px 22px;
  border-radius: 24px;
  text-decoration: none;
  font-size: 1.1em;
  box-shadow: 0 2px 8px #0001;
  transition: background 0.2s;
}

.zalo-btn:hover {
  background: #1baf4a;
}

main {
  max-width: 600px;
  margin: 32px auto 0 auto;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 12px #0001;
  padding: 24px 18px;
}

/* Product detail page styles */
.product-container {
  display: flex;
  gap: 30px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
  flex-wrap: wrap;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.1);
}

.product-images {
  flex: 1;
  min-width: 300px;
}

.main-image {
  text-align: center;
  margin-bottom: 20px;
}

.main-image img {
  width: 100%;
  max-width: 500px;
  height: 400px;
  object-fit: cover;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.image-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: 10px;
  margin-top: 15px;
}

.image-gallery img {
  width: 100%;
  height: 80px;
  object-fit: cover;
  border-radius: 8px;
  cursor: pointer;
  transition: transform 0.2s, border-color 0.2s;
  border: 2px solid transparent;
}

.image-gallery img:hover {
  transform: scale(1.05);
  border-color: #7ed957;
}

.product-info {
  flex: 1;
  min-width: 300px;
}

.product-info h1 {
  color: #388e3c;
  margin-bottom: 10px;
  font-size: 2em;
}

.price {
  font-size: 1.3em;
  color: #388e3c;
  font-weight: bold;
  margin-bottom: 20px;
}

.product-description, .specifications, .features {
  margin-bottom: 25px;
}

.product-description h2, .specifications h2, .features h2 {
  color: #388e3c;
  border-bottom: 2px solid #7ed957;
  padding-bottom: 5px;
  margin-bottom: 15px;
  font-size: 1.3em;
}

.specifications ul, .features ul {
  list-style: none;
  padding: 0;
}

.specifications li, .features li {
  padding: 8px 0;
  border-bottom: 1px solid #eee;
}

.contact-section {
  background: #f9f9f9;
  padding: 20px;
  border-radius: 10px;
  text-align: center;
}

.zalo-button {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: #0068ff;
  color: white;
  padding: 12px 24px;
  border-radius: 25px;
  text-decoration: none;
  font-weight: bold;
  transition: background 0.3s;
}

.zalo-button:hover {
  background: #0056cc;
}

.zalo-button img {
  width: 24px;
  height: 24px;
}

/* Footer styles */
footer {
  text-align: center;
  padding: 18px 8px;
  background: #e6f9ea;
  color: #388e3c;
  font-size: 0.95em;
  margin-top: 32px;
}

.footer-content {
  display: flex;
  justify-content: space-around;
  max-width: 800px;
  margin: 0 auto;
  padding: 20px 0;
}

.footer-section h3 {
  color: #388e3c;
  margin-bottom: 10px;
}

.footer-bottom {
  border-top: 1px solid #b2f2c7;
  padding-top: 15px;
  margin-top: 15px;
}

.intro h2 {
  color: #388e3c;
  margin-top: 0;
}

.main-btn {
  display: inline-block;
  margin-top: 18px;
  background: #7ed957;
  color: #fff;
  font-weight: bold;
  padding: 10px 24px;
  border-radius: 24px;
  text-decoration: none;
  font-size: 1em;
  transition: background 0.2s;
}

.main-btn:hover {
  background: #388e3c;
}

/* Responsive design */
@media (max-width: 768px) {
  .nav-container {
    flex-direction: column;
    gap: 15px;
  }
  
  .nav-menu {
    gap: 15px;
  }
  
  .product-container {
    flex-direction: column;
    padding: 15px;
  }
  
  .image-gallery {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .main-image img {
    height: 300px;
  }
  
  .footer-content {
    flex-direction: column;
    gap: 20px;
  }
}

@media (max-width: 600px) {
  main {
    margin: 18px 4px 0 4px;
    padding: 14px 4px;
  }
  
  .avatar {
    width: 90px;
    height: 90px;
  }
  
  nav ul {
    gap: 8px;
  }
  
  .logo img {
    width: 50px;
    height: 50px;
  }
  
  .logo span {
    font-size: 1.2em;
  }
}