/* ---------- Base Layout ---------- */
html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}
body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  font-family: Arial, Helvetica, sans-serif;
  background-color: #f0f0f0;
  color: #333;
}

/* ---------- Header ---------- */
header {
  background-color: #000;
  color: #fff;
  padding: 1rem 2rem;
}
nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1.5rem;
}
nav a {
  color: #fff;
  text-decoration: none;
  font-weight: bold;
}
nav a:hover {
  text-decoration: underline;
}

/* ---------- Main ---------- */
main {
  flex: 1;
  padding: 2rem;
  display: flex;
  gap: 2rem;
}

/* ---------- Image Slider ---------- */
.product-img {
  flex: 1;
  max-width: 480px;
  position: relative;
  overflow: hidden;
  border-radius: 6px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.product-img img {
  width: 100%;
  height: 100%;
  display: none;
  object-fit: contain;
}
.product-img .active {
  display: block;
}

.prev, .next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(0,0,0,0.5);
  color: #fff;
  border: none;
  padding: 0.5rem 0.8rem;
  cursor: pointer;
  font-size: 1.2rem;
  border-radius: 4px;
}
.prev { left: 10px; }
.next { right: 10px; }

.prev:hover, .next:hover {
  background: rgba(0,0,0,0.7);
}

/* ---------- Product Description ---------- */
.product-desc {
  flex: 2;
  display: flex;
  flex-direction: column;
}

.product-desc h1 {
  margin-top: 0;
}

.product-desc p {
  line-height: 1.6;
}

.price {
  font-size: 1.4rem;
  font-weight: bold;
  color: #e91e63;
  margin: 1rem 0;
}

.buy-btn {
  align-self: flex-start;
  padding: 0.6rem 1.2rem;
  background-color: #1976d2;
  color: #fff;
  border: none;
  cursor: pointer;
  border-radius: 4px;
  font-size: 1rem;
}

.buy-btn:hover {
  background-color: #1565c0;
}

/* ---------- Footer ---------- */
footer {
  background-color: #000;
  color: #fff;
  text-align: center;
  padding: 1rem 2rem;
  flex-shrink: 0;
}