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

:root {
  --link: #66aaff;
  --link-visited: #aa8cff;
  --link-hover: #c7ddff;
}

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

a:visited {
  color: var(--link-visited);
}

a:hover,
a:focus {
  color: var(--link-hover);
  text-decoration: underline;
  outline: none;
}

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: #333;
  padding-top: 70px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

section {
  padding: 80px 0;
}

section:nth-child(even) {
  background: #f8f9fa;
}

h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 20px;
  color: #667eea;
}

.section-subtitle {
  text-align: center;
  font-size: 1.2rem;
  color: #666;
  margin-bottom: 60px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 768px) {
  header h1 {
    font-size: 2.5rem;
  }

  header p {
    font-size: 1.2rem;
  }

  h2 {
    font-size: 2rem;
  }
}