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

body {
  display: flex;
  justify-content: top;
  flex-direction: column;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  background-attachment: fixed;
  color: #ffffff;
  line-height: 1.6;
  min-height: 100vh;
}

html {
  font-size: 16px;
}

.return {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
  margin: 0 !important;
}

.return a {
  padding: 12px 30px;
  border-radius: 25px;
  text-decoration: none;
  display: inline-block;
  transition: transform 0.2s;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: #ffffff;
}

.return a:hover {
  transform: scale(1.05);
  background: rgba(255, 255, 255, 0.3);
}


.header-links {
  text-align: right;
  padding: 20px;
}

.header-links a {
  padding: 10px 20px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 20px;
  text-decoration: none;
  color: white;
  transition: background 0.3s ease;
}

.header-links a:hover {
  background: rgba(255, 255, 255, 0.3);
}

.main-content {
  text-align: center;
  padding: 40px 20px;
}

.main-title {
  font-size: 2.5em;
  margin-bottom: 40px;
}

.navigation-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  max-width: 900px;
  margin: 0 auto;
}

.nav-card {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 20px;
  padding: 30px;
  text-decoration: none;
  color: white;
  transition: all 0.3s ease;
  border: 1px solid rgba(255, 255, 255, 0.2);
  text-align: center;
}

.nav-card:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.nav-card h2 {
  font-size: 1.8em;
  margin-bottom: 15px;
}

@media (max-width: 768px) {
  html {
    font-size: 14px;
  }
  
  .navigation-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .main-content {
    padding: 30px 15px;
  }
  
  .main-title {
    font-size: 2em;
    margin-bottom: 30px;
  }
}

@media (max-width: 480px) {
  html {
    font-size: 12px;
  }
  
  .header-links {
    padding: 15px;
  }
  
  .main-content {
    padding: 20px 10px;
  }
  
  .main-title {
    font-size: 1.8em;
    margin-bottom: 25px;
  }
  
  .navigation-grid {
    gap: 15px;
  }
  
  .nav-card {
    padding: 20px;
  }
  
  .nav-card h2 {
    font-size: 1.5em;
  }
}