:root {
  --bg: #0f111a;
  --card: #141824;
  --primary: #0efc94; /* neon green */
  --accent: #0efc94;
  --text: #c0ffc0;
  --radius: 12px;
  --shadow: rgba(0, 255, 150, 0.3);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Orbitron", sans-serif;
  background: var(--bg);
  color: var(--text);
  padding: 20px;
  padding-bottom: 100px;
}

h1 {
  margin-bottom: 20px;
  color: var(--primary);
}

/* GRID */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
}

/* CARD */
.card {
  background: var(--card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 0 20px var(--shadow);
  transition: transform .2s, box-shadow .2s;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 0 25px var(--primary);
}

.card img {
  width: 100%;
  height: 140px;
  object-fit: cover;
  border-bottom: 1px solid var(--primary);
}

.card h3 {
  padding: 12px;
  font-size: 16px;
  text-align: center;
  color: var(--text);
}

/* PRODUCT LIST */
ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

li {
  background: var(--card);
  margin-bottom: 12px;
  padding: 14px;
  border-radius: var(--radius);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 0 10px var(--shadow);
  transition: box-shadow .2s;
}

li:hover {
  box-shadow: 0 0 15px var(--primary);
}

.product-name {
  font-weight: 600;
}

/* BUTTONS */
button {
  border: 1px solid var(--primary);
  padding: 8px 12px;
  border-radius: var(--radius);
  cursor: pointer;
  font-weight: 600;
  background: transparent;
  color: var(--text);
  transition: background .2s, color .2s, box-shadow .2s;
}

button:hover {
  background: var(--primary);
  color: #000;
  box-shadow: 0 0 10px var(--primary);
}

.btn-add {
  border-color: #0afc70;
}

.btn-buy {
  border-color: #0efc94;
}

/* CART FLOAT */
.cart-float {
  position: fixed;
  right: 20px;
  bottom: 20px;
  background: var(--primary);
  color: #000;
  padding: 14px 20px;
  border-radius: 999px;
  font-weight: 700;
  box-shadow: 0 0 25px var(--primary);
  cursor: pointer;
  z-index: 999;
}

/* CHECKOUT */
.cart-row {
  background: var(--card);
  margin-bottom: 10px;
  padding: 12px;
  border-radius: var(--radius);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
}

/* RESPONSIVE LAYOUTS */
@media (max-width: 768px) {
  .grid {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  }

  li {
    flex-direction: column;
    align-items: flex-start;
  }

  .product-actions {
    width: 100%;
    justify-content: flex-start;
  }

  .cart-row {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  body {
    padding: 10px;
  }

  h1 {
    font-size: 1.4rem;
  }

  .card img {
    height: 120px;
  }

  button {
    padding: 10px;
    width: 100%; /* full width buttons */
    font-size: 0.95rem;
  }

  .cart-float {
    padding: 10px 16px;
    font-size: 0.9rem;
  }

  .product-actions {
    flex-direction: column;
    gap: 6px;
  }
}