:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --secondary: #8b5cf6;
  --text: #1f2937;
  --text-light: #6b7280;
  --bg: #ffffff;
  --bg-gray: #f9fafb;
  --border: #e5e7eb;
  --success: #10b981;
  --max-width: 1200px;
}

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

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

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

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

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

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

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

.btn-primary {
  background: var(--primary);
  color: white;
  border: none;
  padding: 0.625rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  transition: background 0.2s;
}

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

/* Hero Section */
.hero {
  padding: 4rem 0;
  text-align: center;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
  color: var(--text);
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-light);
  margin-bottom: 2rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

/* Upload Section */
.upload-section {
  background: var(--bg-gray);
  border-radius: 1rem;
  padding: 3rem 2rem;
  margin: 3rem 0;
  text-align: center;
}

.upload-area {
  border: 2px dashed var(--border);
  border-radius: 0.75rem;
  padding: 3rem 2rem;
  background: var(--bg);
  cursor: pointer;
  transition: border-color 0.2s;
}

.upload-area:hover {
  border-color: var(--primary);
}

.upload-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 1rem;
  opacity: 0.5;
}

.sample-images {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 2rem;
  flex-wrap: wrap;
}

.sample-img {
  width: 100px;
  height: 100px;
  border-radius: 0.5rem;
  object-fit: cover;
  cursor: pointer;
  border: 2px solid transparent;
  transition: border-color 0.2s;
}

.sample-img:hover {
  border-color: var(--primary);
}

/* Content Sections */
.section {
  padding: 3rem 0;
}

.section h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text);
}

.section p {
  font-size: 1.125rem;
  color: var(--text-light);
  line-height: 1.75;
  margin-bottom: 1.5rem;
}

/* Steps */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.step {
  background: var(--bg-gray);
  padding: 2rem;
  border-radius: 0.75rem;
  text-align: center;
}

.step-number {
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 auto 1rem;
}

.step h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.step p {
  font-size: 1rem;
  color: var(--text-light);
}

/* Features Grid */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.feature-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 2rem;
  text-decoration: none;
  color: var(--text);
  transition: box-shadow 0.2s, transform 0.2s;
}

.feature-card:hover {
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--primary);
}

.feature-card p {
  font-size: 1rem;
  color: var(--text-light);
  margin: 0;
}

/* FAQ */
.faq {
  margin: 3rem 0;
}

.faq-item {
  background: var(--bg-gray);
  border-radius: 0.5rem;
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.faq-item h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text);
}

.faq-item p {
  font-size: 1rem;
  color: var(--text-light);
  margin: 0;
}

/* Footer */
footer {
  background: var(--bg-gray);
  padding: 3rem 0 1.5rem;
  margin-top: 4rem;
}

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

.footer-section h2,
.footer-section h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text);
}

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

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

.footer-links a {
  color: var(--text-light);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.2s;
}

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

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
  text-align: center;
  color: var(--text-light);
  font-size: 0.875rem;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.mobile-menu-toggle svg {
  width: 24px;
  height: 24px;
}

/* Image-Text Mixed Layout Patterns */

/* Pattern 1: Side-by-Side (Desktop 50/50, Mobile stacked) */
.section-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  margin: 2rem 0;
}

.section-two-col img {
  width: 100%;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.section-two-col .text-content h2 {
  margin-bottom: 1rem;
}

.section-two-col .text-content p {
  margin-bottom: 1rem;
}

/* Pattern 2: Image Gallery Grid */
.image-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.image-gallery img {
  width: 100%;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s;
}

.image-gallery img:hover {
  transform: scale(1.02);
}

/* Pattern 3: Stacked (Text-first) */
.section-stacked {
  text-align: center;
}

.section-stacked h2 {
  text-align: center;
  margin-bottom: 1rem;
}

.section-stacked .image-wrapper {
  margin-top: 2rem;
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.section-stacked .image-wrapper img {
  max-width: 500px;
  width: 100%;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* Hero with Image */
.hero-with-image {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  padding: 4rem 0;
}

.hero-with-image .hero-content {
  text-align: left;
}

.hero-with-image .hero-image img {
  width: 100%;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg);
    flex-direction: column;
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    gap: 0;
  }
  
  .nav-links.active {
    display: flex;
  }
  
  .nav-links li {
    padding: 0.75rem 0;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .steps {
    grid-template-columns: 1fr;
  }
  
  .features {
    grid-template-columns: 1fr;
  }
  
  /* Mobile adjustments for new layouts */
  .section-two-col {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .hero-with-image {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .hero-with-image .hero-content {
    text-align: center;
  }
  
  .image-gallery {
    grid-template-columns: 1fr;
  }
  
  .section-stacked .image-wrapper img {
    max-width: 100%;
  }
}