* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background: #0f172a;
  color: white;
}

/* ===========================
   HEADER / NAVBAR
   =========================== */
header {
  background: #111827;
  padding: 20px 60px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.logo {
  font-size: 28px;
  font-weight: bold;
  color: #38bdf8;
}

nav a {
  color: white;
  text-decoration: none;
  margin-left: 30px;
  transition: 0.3s;
  font-weight: 500;
}

nav a:hover {
  color: #38bdf8;
}

/* ===========================
   Banner SECTION
   =========================== */
.banner {
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  padding: 100px 60px;
  text-align: center;
  border-bottom: 2px solid #38bdf8;
}

.banner-content h1 {
  font-size: 60px;
  margin-bottom: 20px;
  color: #38bdf8;
  text-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
}

.banner-content p {
  font-size: 20px;
  margin-bottom: 30px;
  color: #94a3b8;
}

/* ===========================
   BUTTON
   =========================== */
.btn {
  padding: 14px 30px;
  background: #38bdf8;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: bold;
  transition: 0.3s;
  color: #0f172a;
  font-size: 16px;
}

.btn:hover {
  background: #0ea5e9;
  transform: scale(1.05);
}

/* ===========================
   PRODUCTS SECTION
   =========================== */
.products {
  padding: 80px 60px;
}

.title {
  text-align: center;
  font-size: 40px;
  margin-bottom: 50px;
  color: #38bdf8;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  max-width: 1400px;
  margin: 0 auto;
}

.card {
  background: #1e293b;
  border-radius: 15px;
  overflow: hidden;
  transition: 0.3s;
  border: 1px solid rgba(56, 189, 248, 0.1);
}

.card:hover {
  transform: translateY(-10px);
  border-color: #38bdf8;
}

.card img {
  width: 100%;
  height: 250px;
  object-fit: cover;
}

.card-content {
  padding: 20px;
}

.card-content h3 {
  color: #38bdf8;
  margin-bottom: 10px;
  font-size: 20px;
}

.card-content p {
  color: #94a3b8;
  font-size: 14px;
  line-height: 1.6;
  margin-bottom: 15px;
}

.price {
  color: #38bdf8;
  font-size: 22px;
  font-weight: bold;
  margin: 15px 0;
}

/* ===========================
   RESPONSIVE DESIGN
   =========================== */
@media (max-width: 768px) {
  header {
    padding: 15px 20px;
    flex-direction: column;
    gap: 15px;
  }

  nav a {
    margin: 0 10px;
    font-size: 14px;
  }

  .hero {
    padding: 60px 20px;
  }

  .hero-content h1 {
    font-size: 36px;
  }

  .hero-content p {
    font-size: 16px;
  }

  .products {
    padding: 60px 20px;
  }

  .title {
    font-size: 32px;
  }

  .product-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

@media (max-width: 480px) {
  .hero-content h1 {
    font-size: 28px;
  }

  .logo {
    font-size: 24px;
  }

  .btn {
    width: 100%;
    padding: 12px 20px;
  }
}