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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  color: #333;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

.hero {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 100px 20px;
  text-align: center;
}

.hero h1 {
  font-size: clamp(32px, 5vw, 56px);
  margin-bottom: 16px;
}

.hero .subtitle {
  font-size: clamp(16px, 2vw, 20px);
  margin-bottom: 32px;
  opacity: 0.95;
}

.btn {
  display: inline-block;
  background: white;
  color: #667eea;
  padding: 14px 32px;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 600;
  transition: transform 0.2s;
}

.btn:hover {
  transform: translateY(-2px);
}

.features {
  padding: 80px 20px;
  background: #f8f9fa;
}

.features h2, .about h2, footer h2 {
  text-align: center;
  font-size: clamp(24px, 3vw, 36px);
  margin-bottom: 48px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
}

.card {
  background: white;
  padding: 32px;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
  text-align: center;
}

.icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.card h3 {
  margin-bottom: 12px;
  color: #667eea;
}

.about {
  padding: 80px 20px;
}

.about p {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
  font-size: 18px;
}

footer {
  background: #2d3748;
  color: white;
  padding: 60px 20px;
  text-align: center;
}

footer h2 {
  margin-bottom: 32px;
}

footer p {
  margin: 8px 0;
  opacity: 0.9;
}

@media (max-width: 768px) {
  .hero {
    padding: 60px 20px;
  }
  .features, .about {
    padding: 50px 20px;
  }
}