/* Reset & Base */
:root {
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --secondary: #64748b;
  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --light: #f8fafc;
  --dark: #0f172a;
  --gray: #94a3b8;
  --gray-light: #e2e8f0;
  --white: #ffffff;
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --radius: 0.5rem;
  --font-sans: system-ui, -apple-system, sans-serif;
}

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

body {
  font-family: var(--font-sans);
  line-height: 1.5;
  color: var(--dark);
  background-color: var(--light);
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Layout */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.row {
  display: flex;
  flex-wrap: wrap;
  margin: -0.5rem;
}

.col {
  flex: 1;
  padding: 0.5rem;
}

.col-3 { flex: 0 0 25%; max-width: 25%; padding: 0.5rem; }
.col-4 { flex: 0 0 33.333%; max-width: 33.333%; padding: 0.5rem; }
.col-6 { flex: 0 0 50%; max-width: 50%; padding: 0.5rem; }
.col-8 { flex: 0 0 66.666%; max-width: 66.666%; padding: 0.5rem; }
.col-12 { flex: 0 0 100%; max-width: 100%; padding: 0.5rem; }

@media (max-width: 768px) {
  .col-3, .col-4, .col-6, .col-8 {
    flex: 0 0 100%;
    max-width: 100%;
  }
}

/* Components */
.btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  font-weight: 500;
  text-align: center;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s;
}

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

.btn-primary:hover {
  background-color: var(--primary-dark);
  text-decoration: none;
}

.btn-outline {
  background-color: transparent;
  border-color: var(--primary);
  color: var(--primary);
}

.btn-outline:hover {
  background-color: var(--primary);
  color: var(--white);
  text-decoration: none;
}

.btn-danger {
  background-color: var(--danger);
  color: var(--white);
}

.btn-block {
  display: block;
  width: 100%;
}

.card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.card-img {
  height: 200px;
  object-fit: cover;
  background-color: var(--gray-light);
}

.card-body {
  padding: 1rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

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

.card-text {
  color: var(--secondary);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.card-footer {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.price {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--dark);
}

/* Navbar */
.navbar {
  background-color: var(--white);
  box-shadow: var(--shadow);
  padding: 1rem 0;
  margin-bottom: 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar-brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
}

.nav-link {
  color: var(--secondary);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
  text-decoration: none;
}

.badge {
  background-color: var(--danger);
  color: var(--white);
  font-size: 0.75rem;
  padding: 0.15rem 0.4rem;
  border-radius: 999px;
  margin-left: 0.25rem;
}

/* Utilities */
.text-center { text-align: center; }
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1.5rem; }

.d-flex { display: flex; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 0.5rem; }

/* Cart Specific */
.cart-item {
  display: flex;
  align-items: center;
  padding: 1rem;
  border-bottom: 1px solid var(--gray-light);
  background: var(--white);
}

.cart-item img {
  width: 80px;
  height: 80px;
  object-fit: cover;
  border-radius: var(--radius);
  margin-right: 1rem;
}

.cart-item-details {
  flex: 1;
}

.quantity-control {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.quantity-btn {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid var(--gray);
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.quantity-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* Alert */
.alert {
  padding: 1rem;
  border-radius: var(--radius);
  margin-bottom: 1rem;
  background-color: var(--primary);
  color: var(--white);
  opacity: 0.9;
}

.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--dark);
  color: var(--white);
  padding: 1rem 1.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transform: translateY(150%);
  transition: transform 0.3s ease;
  z-index: 1000;
}

.toast.show {
  transform: translateY(0);
}