:root {
  /* Color Palette - Industrial & Playful */
  --color-primary: #FF3E00; /* Construction Orange */
  --color-secondary: #007AFF; /* Blueprint Blue */
  --color-accent: #FFD600; /* Caution Yellow */
  --color-dark: #1A1A1B; /* Asphalt */
  --color-light: #F4F4F9; /* Concrete Light */
  --color-white: #FFFFFF;
  
  /* Textures & Shadows */
  --shadow-sm: 4px 4px 0px var(--color-dark);
  --shadow-md: 8px 8px 0px var(--color-dark);
  --shadow-lg: 12px 12px 0px var(--color-dark);
  
  /* Spacing */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 48px;
  --space-xl: 80px;
  --space-2xl: 120px;

  /* Typography */
  --font-display: 'Impact', 'Arial Black', sans-serif;
  --font-body: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

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

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

h1, h2, h3, .nav-logo {
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Layout */
.container {
  width: 100%;
  max-width: 1300px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 5vw, 4rem);
}

section {
  margin-top: var(--space-xl);
  padding: var(--space-md) 0;
}

main > :first-child {
  margin-top: 0;
}

/* Navigation */
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) 0;
  border-bottom: 4px solid var(--color-dark);
  background: var(--color-white);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-logo {
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--color-dark);
}

.nav-logo .brick-icon {
  width: 32px;
  height: 20px;
  background: var(--color-primary);
  border: 3px solid var(--color-dark);
  position: relative;
}

.nav-logo .brick-icon::after,
.nav-logo .brick-icon::before {
  content: '';
  position: absolute;
  top: -6px;
  width: 8px;
  height: 4px;
  background: var(--color-primary);
  border: 3px solid var(--color-dark);
  border-bottom: none;
}
.nav-logo .brick-icon::before { left: 4px; }
.nav-logo .brick-icon::after { right: 4px; }

.nav-links {
  display: flex;
  gap: var(--space-md);
}

.nav-links a {
  text-decoration: none;
  color: var(--color-dark);
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--color-primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 12px 24px;
  background: var(--color-primary);
  color: var(--color-white);
  text-decoration: none;
  font-family: var(--font-display);
  text-transform: uppercase;
  border: 4px solid var(--color-dark);
  box-shadow: var(--shadow-sm);
  transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  cursor: pointer;
}

.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0px var(--color-dark);
}

.btn:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0px var(--color-dark);
}

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

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

/* Hero Section */
.hero {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-lg);
  align-items: center;
  min-height: 80vh;
  padding: var(--space-lg) 0;
}

.hero-content h1 {
  font-size: clamp(3rem, 8vw, 6rem);
  line-height: 0.9;
  margin-bottom: var(--space-md);
}

.hero-content p {
  font-size: 1.2rem;
  max-width: 500px;
  margin-bottom: var(--space-lg);
}

.hero-visual {
  position: relative;
  height: 500px;
  background: var(--color-secondary);
  border: 4px solid var(--color-dark);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.brick-pattern {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  width: 120%;
  transform: rotate(-5deg);
}

.brick-unit {
  height: 60px;
  background: rgba(255,255,255,0.2);
  border: 2px solid var(--color-dark);
}

/* Grid Components */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
}

/* Shop Layout */
.shop-layout {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: var(--space-lg);
  margin-top: var(--space-md);
}

.filter-group {
  margin-bottom: var(--space-md);
}

.filter-group h4 {
  font-family: var(--font-display);
  border-bottom: 2px solid var(--color-dark);
  padding-bottom: 4px;
  margin-bottom: var(--space-sm);
}

.filter-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.9rem;
  cursor: pointer;
}

.card {
  background: var(--color-white);
  border: 4px solid var(--color-dark);
  padding: var(--space-md);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.card:hover {
  transform: translate(-4px, -4px);
  box-shadow: 12px 12px 0px var(--color-dark);
}

.card-image {
  width: 100%;
  aspect-ratio: 1;
  background: #eee;
  margin-bottom: var(--space-md);
  border: 2px solid var(--color-dark);
  position: relative;
  overflow: hidden;
}

.placeholder-image {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #ddd;
  color: #666;
  font-weight: bold;
}

.badge {
  display: inline-block;
  padding: 4px 8px;
  background: var(--color-accent);
  border: 2px solid var(--color-dark);
  font-size: 0.7rem;
  font-weight: 800;
  text-transform: uppercase;
  margin-bottom: var(--space-xs);
}

/* Shop Section Specifics */
.product-info {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
}

.price {
  font-family: var(--font-display);
  font-size: 1.5rem;
}

/* Build Interface */
.build-interface {
  display: grid;
  grid-template-columns: 300px 1fr 300px;
  height: 80vh;
  border: 4px solid var(--color-dark);
  margin-top: var(--space-lg);
  background: var(--color-white);
}

.sidebar {
  border-right: 4px solid var(--color-dark);
  padding: var(--space-md);
  overflow-y: auto;
}

.canvas-area {
  background: #E0E0E0;
  background-image: radial-gradient(var(--color-dark) 1px, transparent 1px);
  background-size: 20px 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.toolbar {
  border-left: 4px solid var(--color-dark);
  padding: var(--space-md);
}

.part-item {
  width: 100%;
  aspect-ratio: 1.5;
  background: var(--color-light);
  border: 2px solid var(--color-dark);
  margin-bottom: var(--space-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.part-item:hover {
  border-color: var(--color-primary);
}

/* Footer */
footer {
  margin-top: var(--space-2xl);
  background: var(--color-dark);
  color: var(--color-white);
  padding: var(--space-xl) 0 var(--space-md);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 2rem;
  margin-bottom: var(--space-md);
}

.footer-links h4 {
  margin-bottom: var(--space-md);
  text-transform: uppercase;
  color: var(--color-accent);
}

.footer-links ul {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--space-xs);
}

.footer-links a {
  color: #ccc;
  text-decoration: none;
}

.footer-bottom {
  padding-top: var(--space-md);
  border-top: 1px solid #444;
  text-align: center;
  font-size: 0.8rem;
  color: #888;
}

/* Responsive */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; }
  .build-interface { grid-template-columns: 1fr; height: auto; }
  .sidebar, .toolbar { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .shop-layout { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .nav-links { display: none; }
}