:root {
  --color-bg: #121212;
  --color-bg-alt: #1e1e1e;
  --color-text: #e0e0e0;
  --color-primary: #4f46e5;
  --color-secondary: #6b7280;
  --color-accent: #f59e0b;
  --color-muted: #4b5563;
  --spacing: 1rem;
  --radius: 0.5rem;
  --transition: 0.3s ease;
  --max-width: 1200px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
}

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

a:hover {
  color: var(--color-accent);
}

header {
  position: fixed;
  top: 0;
  width: 100%;
  background: var(--color-bg-alt);
  z-index: 1000;
  box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.nav {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing);
}

.logo {
  font-size: 1.5rem;
  font-weight: 600;
}

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

.nav-links li a {
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
}

.nav-links li a:hover {
  background: var(--color-muted);
}

main {
  padding-top: calc(4rem + var(--spacing));
}

section {
  padding: 4rem var(--spacing);
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing);
}

.hero-content {
  flex: 1 1 45%;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.hero p {
  font-size: 1.125rem;
  margin-bottom: 1.5rem;
}

.btn-primary,
.btn-secondary {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 600;
  transition: background var(--transition), transform var(--transition);
}

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

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

.btn-secondary {
  background: var(--color-muted);
  color: var(--color-text);
}

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

.hero-image img {
  width: 100%;
  max-width: 500px;
  border-radius: var(--radius);
  object-fit: cover;
}

.features h2,
.pricing h2,
.testimonials h2 {
  text-align: center;
  margin-bottom: 2rem;
  font-size: 2rem;
}

.feature-grid,
.pricing-grid,
.testimonial-grid {
  display: grid;
  gap: var(--spacing);
}

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

.feature-card,
.pricing-card,
.testimonial-card {
  background: var(--color-bg-alt);
  padding: var(--spacing);
  border-radius: var(--radius);
  transition: transform var(--transition);
}

.feature-card:hover,
.pricing-card:hover,
.testimonial-card:hover {
  transform: translateY(-5px);
}

.feature-card img,
.pricing-card img,
.testimonial-card img {
  width: 100%;
  border-radius: var(--radius);
  margin-bottom: var(--spacing);
}

.feature-card h3,
.pricing-card h3,
.testimonial-card h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.pricing-grid {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.pricing-card.featured {
  background: var(--color-primary);
  color: #fff;
}

.pricing-card.featured h3,
.pricing-card.featured p,
.pricing-card.featured ul,
.pricing-card.featured a {
  color: #fff;
}

.price {
  font-size: 2rem;
  margin: 0.5rem 0;
}

.price span {
  font-size: 1rem;
  color: var(--color-muted);
}

.testimonial-grid {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.testimonial-card blockquote {
  margin: 0;
  font-style: italic;
}

.testimonial-card footer {
  margin-top: 1rem;
  font-weight: 600;
}

footer {
  background: var(--color-bg-alt);
  padding: var(--spacing);
  text-align: center;
}

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

.footer-links a {
  margin: 0 0.75rem;
  font-size: 0.9rem;
}

.copyright {
  font-size: 0.8rem;
  color: var(--color-muted);
}

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition), transform var(--transition);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 768px) {
  .hero {
    flex-direction: column;
  }
  .hero-content,
  .hero-image {
    flex: 1 1 100%;
  }
  .nav-links {
    display: none;
  }
}