:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --secondary: #64748b;
  --success: #22c55e;
  --warning: #f59e0b;
  --bg-light: #f8fafc;
  --bg-white: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --border: #e2e8f0;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --radius: 8px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-light);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header */
header {
  background: var(--bg-white);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo svg {
  width: 32px;
  height: 32px;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 2rem;
}

nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

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

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  padding: 4rem 0;
  text-align: center;
}

.hero h1 {
  font-size: 2.75rem;
  margin-bottom: 1rem;
  font-weight: 800;
}

.hero p {
  font-size: 1.25rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto 2rem;
}

.hero-badges {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.badge {
  background: rgba(255,255,255,0.2);
  padding: 0.5rem 1rem;
  border-radius: 2rem;
  font-size: 0.875rem;
  font-weight: 500;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
}

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

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

.btn-secondary {
  background: var(--bg-white);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

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

.btn-outline-white {
  background: transparent;
  color: white;
  border: 2px solid white;
}

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

/* Section styling */
section {
  padding: 4rem 0;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 0.5rem;
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 3rem;
}

/* Product Cards */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.product-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
}

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

.product-image {
  width: 100%;
  height: 250px;
  object-fit: cover;
  background: var(--bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-content {
  padding: 1.5rem;
}

.product-content h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.product-content p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.product-meta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.product-actions {
  display: flex;
  gap: 0.75rem;
}

/* Use Cases */
.use-cases {
  background: var(--bg-white);
}

.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.use-case-card {
  text-align: center;
  padding: 2rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: border-color 0.2s;
}

.use-case-card:hover {
  border-color: var(--primary);
}

.use-case-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 1rem;
  background: var(--bg-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}

.use-case-card h3 {
  margin-bottom: 0.5rem;
}

.use-case-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Reviews */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.review-card {
  background: var(--bg-white);
  padding: 1.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.reviewer-avatar {
  width: 48px;
  height: 48px;
  background: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
  font-size: 1.25rem;
}

.reviewer-info h4 {
  font-size: 1rem;
  margin-bottom: 0.125rem;
}

.reviewer-info span {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.review-stars {
  color: var(--warning);
  margin-bottom: 0.75rem;
}

.review-card p {
  color: var(--text-secondary);
  font-style: italic;
}

.review-product {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Specs Table */
.specs-section {
  background: var(--bg-white);
}

.specs-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}

.specs-table th,
.specs-table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.specs-table th {
  background: var(--bg-light);
  font-weight: 600;
}

.specs-table tr:hover {
  background: var(--bg-light);
}

/* Downloads */
.downloads-section {
  background: var(--bg-light);
}

.downloads-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
}

.download-card {
  background: var(--bg-white);
  padding: 1.25rem;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  gap: 1rem;
  text-decoration: none;
  color: inherit;
  border: 1px solid var(--border);
  transition: all 0.2s;
}

.download-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
}

.download-icon {
  width: 48px;
  height: 48px;
  background: var(--bg-light);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.download-info h4 {
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
}

.download-info span {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* Print Settings */
.print-settings {
  background: var(--bg-white);
  border-radius: var(--radius);
  padding: 2rem;
  margin-top: 2rem;
}

.print-settings h3 {
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.setting-item {
  padding: 1rem;
  background: var(--bg-light);
  border-radius: var(--radius);
}

.setting-item label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.setting-item span {
  font-weight: 600;
}

/* Footer */
footer {
  background: var(--text-primary);
  color: white;
  padding: 3rem 0 1.5rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h4 {
  margin-bottom: 1rem;
  font-size: 1rem;
}

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

.footer-section li {
  margin-bottom: 0.5rem;
}

.footer-section a {
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  transition: color 0.2s;
}

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

.footer-bottom {
  text-align: center;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.5);
  font-size: 0.875rem;
}

/* Product Page */
.product-hero {
  background: var(--bg-white);
  padding: 3rem 0;
}

.product-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.product-gallery {
  position: sticky;
  top: 100px;
}

.main-image {
  width: 100%;
  aspect-ratio: 1;
  background: var(--bg-light);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  overflow: hidden;
}

.main-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.thumbnail-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
}

.thumbnail {
  aspect-ratio: 1;
  background: var(--bg-light);
  border-radius: 4px;
  cursor: pointer;
  border: 2px solid transparent;
  overflow: hidden;
}

.thumbnail:hover,
.thumbnail.active {
  border-color: var(--primary);
}

.product-info h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.product-tagline {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
}

.product-description {
  margin-bottom: 2rem;
}

.product-description p {
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

.features-list {
  list-style: none;
  margin: 1.5rem 0;
}

.features-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.features-list li::before {
  content: "✓";
  color: var(--success);
  font-weight: 700;
}

/* Callout boxes */
.callout {
  padding: 1.25rem;
  border-radius: var(--radius);
  margin: 1.5rem 0;
}

.callout-info {
  background: #eff6ff;
  border-left: 4px solid var(--primary);
}

.callout-warning {
  background: #fffbeb;
  border-left: 4px solid var(--warning);
}

.callout-success {
  background: #f0fdf4;
  border-left: 4px solid var(--success);
}

.callout h4 {
  margin-bottom: 0.5rem;
}

.callout p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin: 0;
}

/* Model viewer placeholder */
.model-viewer {
  background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
  border-radius: var(--radius);
  aspect-ratio: 16/9;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: white;
  margin: 2rem 0;
}

.model-viewer svg {
  width: 64px;
  height: 64px;
  margin-bottom: 1rem;
  opacity: 0.7;
}

.model-viewer p {
  opacity: 0.7;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }
  
  .product-detail {
    grid-template-columns: 1fr;
  }
  
  .product-gallery {
    position: static;
  }
  
  nav ul {
    gap: 1rem;
  }
  
  .header-content {
    flex-direction: column;
    gap: 1rem;
  }
}