* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
  }
  
  body {
    background: #f5f5f5;
  }
  .container {
    max-width: 1800px;
    margin: 0 auto;
    padding: 0 20px;
  }
  
  /* HEADER */
  header {
    background: #111;
    color: #fff;
  }
  .header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 15px 20px;
    display: flex;
    align-items: center;
    position: relative;
  }
  .logo {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: 2px;
  }
  
header nav {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);

  display: flex;
  gap: 30px;
}

header nav a {
  color: #fff;
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
}

  
  
  
  /* BANNER */
  .banner {
    position: relative;
    height: 400px;
    background: url("./hinh/hinhbanner.png") center / cover no-repeat;
    color: white;
  
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
  }
  
  .banner::before {
    content: "";
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
  }
  
  .banner * {
    position: relative;
  }
  .banner-title {
    font-size: 42px;
    font-weight: 800;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 10px;
    text-shadow: 0 4px 12px rgba(0,0,0,0.6);
  }
  .banner-sub {
    font-size: 18px;
    font-weight: 300;
    letter-spacing: 1px;
    margin-bottom: 25px;
    color: #f1f1f1;
    text-shadow: 0 2px 8px rgba(0,0,0,0.6);
  }
  
  .banner-btn {
    padding: 12px 28px;
    background: #000;
    color: white;
    border: 1px solid white;
    font-size: 14px;
    letter-spacing: 1px;
    cursor: pointer;
    transition: 0.3s;
  }
  
  .banner-btn:hover {
    background: white;
    color: black;
  }
  
  
  
  /* PRODUCTS */
  .products {
    padding: 40px 60px;
  }
  
  .products h2 {
    margin-bottom: 25px;
  }
  
  /* GRID 5 CỘT */
  .product-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
  }
  
  /* CARD */
  .product-card {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 6px 15px rgba(0,0,0,0.08);
    transition: 0.3s;
  }
  
  .product-card:hover {
    transform: translateY(-6px);
  }
  
  /* IMAGE */
  .product-img {
    height: 300px;
    overflow: hidden;
  }
  
  .product-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }
  
  /* INFO */
  .product-info {
    padding: 15px;
    text-align: center;
  }
  
  .product-info h3 {
    font-size: 16px;
    margin-bottom: 6px;
  }
  
  .price {
    font-weight: bold;
    margin-bottom: 10px;
  }
  
  .product-info button {
    padding: 8px 16px;
    background: black;
    color: white;
    border: none;
    cursor: pointer;
  }
  
  
  /* FOOTER */
  footer {
    background: #111;
    color: white;
    text-align: center;
    padding: 15px;
    margin-top: 40px;
  }