:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --bg-color: #f8fafc;
  --card-bg: #ffffff;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.5;
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1rem;
}

.navbar {
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 0;
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand-logo {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  text-decoration: none;
}

.brand-logo span {
  color: var(--primary);
}

.search-bar input {
  width: 320px;
  max-width: 100%;
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  outline: none;
}

.search-bar input:focus {
  border-color: var(--primary);
}

.cart-status {
  font-size: 0.95rem;
  font-weight: 600;
}

.hero-banner {
  background: linear-gradient(135deg, #1e293b, #0f172a);
  color: #fff;
  padding: 3rem 2rem;
  border-radius: 12px;
  margin: 2rem 0;
}

.hero-banner h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.hero-banner p {
  color: #94a3b8;
}

.product-section h2 {
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.card-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  flex-grow: 1;
  margin-bottom: 1rem;
}

.card-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-price {
  font-weight: 700;
  color: var(--primary);
}

.btn-buy {
  background-color: var(--primary);
  color: #fff;
  border: none;
  padding: 0.45rem 0.85rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.875rem;
}

.btn-buy:hover {
  background-color: var(--primary-hover);
}

footer {
  border-top: 1px solid var(--border-color);
  background-color: var(--card-bg);
  padding: 1.5rem 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}