/* Global Reset */
body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}

/* Header + Navigation */
header {
  background: #333;
  color: #fff;
  padding: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap; /* allow wrapping on small screens */
}

header h1 {
  font-size: 1.5rem;
}

nav {
  display: flex;
  flex-wrap: wrap;
}

nav a {
  color: #fff;
  margin: 5px 10px;
  text-decoration: none;
}

/* Hamburger menu toggle button */
.menu-toggle {
  display: none;
  font-size: 1.8rem;
  cursor: pointer;
  color: #fff;
}

/* Hero Section */
.hero {
  padding: 40px 20px;
  text-align: center;
  background: #eee;
}

/* Product Grid */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 15px;
  padding: 20px;
}

.product {
  border: 1px solid #ccc;
  padding: 10px;
  text-align: center;
  background: #fff;
  border-radius: 6px;
}

.product img {
  max-width: 100%;
  height: auto;
}

/* Cart Items */
.cart-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.cart-item img {
  margin-right: 10px;
  border: 1px solid #ccc;
}

/* Buttons */
.btn, button {
  background: #333;
  color: #fff;
  padding: 8px 15px;
  text-decoration: none;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

/* Footer */
footer {
  text-align: center;
  padding: 10px;
  background: #333;
  color: #fff;
  margin-top: 20px;
}

/* ========================
   Responsive Breakpoints
   ======================== */

/* Mobile (max 600px) */
@media (max-width: 600px) {
  header {
    flex-direction: column;
    text-align: center;
  }

  /* Hide nav by default */
  nav {
    display: none;
    flex-direction: column;
    width: 100%;
    background: #333;
    text-align: center;
  }

  nav a {
    padding: 10px;
    border-top: 1px solid #444;
  }

  /* Show hamburger */
  .menu-toggle {
    display: block;
  }

  /* When menu is toggled open */
  nav.show {
    display: flex;
  }

  .product-grid {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  }
}

/* Tablets (>=600px) */
@media (min-width: 600px) and (max-width: 1023px) {
  .product-grid {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  }
}

/* Desktop (>=1024px) */
@media (min-width: 1024px) {
  body {
    max-width: 1200px;
    margin: auto;
  }
  header, footer {
    padding: 20px;
  }
}

/* ========================
   Bottom Navigation (Mobile)
   ======================== */
@media (max-width: 768px) {
  header nav, .menu-toggle {
    display: none !important; /* Hide top nav & hamburger */
  }

  .bottom-nav {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: #333;
    border-top: 1px solid #444;
    justify-content: space-around;
    align-items: center;
    padding: 5px 0;
    z-index: 1000;
  }

  .bottom-nav a {
    color: #fff;
    text-align: center;
    font-size: 0.8rem;
    text-decoration: none;
    flex: 1;
  }

  .bottom-nav a:hover {
    background: #444;
  }

  main {
    padding-bottom: 60px; /* avoid content under nav */
  }
}