:root {
  --primary-color: #1e90ff;
  --background: #ffffff;
  --text: #222;
  --card-bg: #f5f5f5;
  --transition: 0.3s;
}

body.dark {
  --background: #121212;
  --text: #f0f0f0;
  --card-bg: #1e1e1e;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Roboto', sans-serif;
  background-color: var(--background);
  color: var(--text);
  line-height: 1.6;
  scroll-behavior: smooth;
  transition: background-color var(--transition), color var(--transition);
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: auto;
}

header {
  background: var(--card-bg);
  position: sticky;
  top: 0;
  z-index: 999;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 1.5rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
}

#toggle-theme {
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  margin-left: 1rem;
}

.hero {
  background: var(--primary-color);
  color: white;
  padding: 4rem 0;
  text-align: center;
}

.hero .btn {
  background: white;
  color: var(--primary-color);
  padding: 0.75rem 1.5rem;
  border: none;
  margin-top: 1rem;
  cursor: pointer;
  transition: var(--transition);
}

.hero .btn:hover {
  background: #e0e0e0;
}

.categories, .products, .contact {
  padding: 4rem 0;
}

.category-grid, .product-grid {
  display: grid;
  gap: 2rem;
  margin-top: 2rem;
}

.category-grid {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.category-card {
  background: var(--card-bg);
  padding: 2rem;
  text-align: center;
  border-radius: 8px;
  transition: transform var(--transition);
}

.category-card:hover {
  transform: translateY(-5px);
}

.category-card i {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

.category-card .btn {
  margin-top: 1rem;
  padding: 0.5rem 1rem;
  background: var(--primary-color);
  color: white;
  border: none;
  cursor: pointer;
}

.product-grid {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.product-card {
  background: var(--card-bg);
  padding: 1rem;
  border-radius: 8px;
  text-align: center;
  transition: transform var(--transition);
}

.product-card:hover {
  transform: translateY(-5px);
}

.product-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: 5px;
}

.product-card .btn {
  margin-top: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--primary-color);
  color: white;
  border: none;
  cursor: pointer;
  transition: background var(--transition);
}

.product-card .btn:hover {
  background: #0f75d4;
}

.contact form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.5rem;
}

.contact input, .contact textarea {
  padding: 0.75rem;
  border: 1px solid #ccc;
  border-radius: 4px;
  background: var(--card-bg);
  color: var(--text);
}

.contact .btn {
  align-self: flex-start;
  padding: 0.5rem 1.5rem;
  background: var(--primary-color);
  color: white;
  border: none;
  cursor: pointer;
}

footer {
  background: var(--card-bg);
  padding: 2rem 0;
  text-align: center;
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
}

.socials a {
  margin: 0 0.5rem;
  color: var(--text);
  font-size: 1.2rem;
}

.footer-links {
  list-style: none;
  display: flex;
  gap: 1rem;
}

.footer-links a {
  text-decoration: none;
  color: var(--text);
}

#scrollToTopBtn {
  position: fixed;
  bottom: 30px;
  right: 30px;
  display: none;
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 0.7rem 1rem;
  border-radius: 50%;
  font-size: 1.2rem;
  cursor: pointer;
  z-index: 999;
}