:root {
  /* Colors */
  --color-primary: #111111;
  --color-secondary: #666666;
  --color-accent: #ccff00; /* Volt Green for sporty vibe */
  --color-accent-hover: #b3e600;
  --color-bg: #ffffff;
  --color-bg-alt: #f8f9fa;
  --color-border: #e5e5e5;
  --color-danger: #ef4444;
  --color-success: #10b981;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-serif: "Playfair Display", serif;
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 64px;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-primary);
  background-color: var(--color-bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  overflow-x: hidden;
}

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

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: 700;
  line-height: 1.2;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.2s;
}

/* Layout */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.section {
  padding: var(--spacing-xxl) 0;
}

.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* Sidebar Layout */
.page-grid {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: var(--spacing-xl);
}

@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .page-grid { grid-template-columns: 1fr; }
  .filter-sidebar { display: none; } /* Hide sidebar on mobile for now */
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: var(--radius-full);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  font-size: 1rem;
}

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

.btn-primary:hover {
  background-color: #333;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn-accent:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background-color: transparent;
  border: 2px solid var(--color-border);
  color: var(--color-primary);
}

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

.btn-sm {
  padding: 8px 16px;
  font-size: 0.875rem;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) 0;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-link {
  font-weight: 500;
  font-size: 0.95rem;
}

.nav-link:hover, .nav-link.active {
  color: var(--color-secondary); /* Slight dim on hover/active for minimalist feel */
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 4px;
  text-decoration-thickness: 2px;
}

/* Hero */
.hero {
  position: relative;
  height: 90vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  background-size: cover;
  background-position: center;
  color: white;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0.3) 100%);
}

.hero-content {
  position: relative;
  z-index: 10;
  max-width: 600px;
}

.hero-title {
  font-size: 4rem;
  line-height: 1.1;
  margin-bottom: var(--spacing-lg);
  font-weight: 900;
}

.hero-subtitle {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xl);
  opacity: 0.9;
}

/* Cards */
.card {
  background: white;
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.product-card {
  background: white;
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all 0.3s ease;
  border: 1px solid transparent;
  display: block; /* Ensure anchor tags behave like blocks */
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-border);
}

.product-image {
  width: 100%;
  aspect-ratio: 1; /* Square */
  background-color: var(--color-bg-alt);
  position: relative;
  overflow: hidden;
}

.placeholder-product {
  width: 100%;
  height: 100%;
  background: #f3f4f6;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #9ca3af;
  font-size: 2rem;
}

.placeholder-product i {
  font-size: 2.5rem;
  opacity: 0.5;
}

.product-info {
  padding: var(--spacing-md);
}

.product-category {
  color: var(--color-secondary);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-xs);
}

.product-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

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

/* Forms */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 1rem;
  transition: border-color 0.2s;
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0,0,0,0.05);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

/* Table (Cart) */
.cart-table {
  width: 100%;
  border-collapse: collapse;
}

.cart-table th {
  text-align: left;
  padding: var(--spacing-md);
  border-bottom: 2px solid var(--color-border);
  color: var(--color-secondary);
  font-weight: 600;
}

.cart-table td {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
  vertical-align: middle;
}

/* Badges & Tags */
.badge {
  display: inline-block;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
}

.badge-new {
  background-color: var(--color-accent);
  color: var(--color-primary);
}

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

/* Footer */
.footer {
  background-color: var(--color-primary);
  color: white;
  padding: var(--spacing-xxl) 0;
}

.footer h3 {
  margin-bottom: var(--spacing-md);
  font-size: 1.25rem;
}

.footer-links {
  list-style: none;
  padding: 0;
}

.footer-links li {
  margin-bottom: var(--spacing-sm);
}

.footer-links a {
  color: #999;
}

.footer-links a:hover {
  color: white;
}

/* Utilities */
.text-center { text-align: center; }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.mt-lg { margin-top: var(--spacing-lg); }

.bg-alt { background-color: var(--color-bg-alt); }

/* Custom */
.filter-sidebar {
  border-right: 1px solid var(--color-border);
  padding-right: var(--spacing-lg);
}

.color-swatch {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
}
.color-swatch.selected { border-color: var(--color-primary); transform: scale(1.1); }

.size-selector {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.size-option {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 500;
}

.size-option:hover { border-color: var(--color-primary); }
.size-option.selected { background: var(--color-primary); color: white; border-color: var(--color-primary); }