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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: linear-gradient(135deg, #66d6ea 0%, #918fff 100%);
  min-height: 100vh;
  padding: 1rem;
  line-height: 1.6;
}

.container {
  max-width: 800px;
  margin: 0 auto;
}

nav.main-nav {
  background: white;
  border-radius: 1rem;
  padding: 1rem;
  margin-bottom: 2rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

nav.main-nav ul {
  list-style: none;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

nav.main-nav a {
  padding: 0.75rem 1.5rem;
  background: #667eea;
  color: white;
  text-decoration: none;
  border-radius: 0.5rem;
  font-weight: 500;
  transition: all 0.2s;
  display: inline-block;
}

nav.main-nav a:hover {
  background: #764ba2;
  transform: translateY(-2px);
}

nav.main-nav a:focus {
  outline: 2px solid #667eea;
  outline-offset: 2px;
}

nav.main-nav a.active {
  background: #2c51f3;
}

.profile-card {
  background: white;
  border-radius: 1rem;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  overflow: hidden;
}

.card-header {
  background: linear-gradient(135deg, #2c51f3 0%, #62e0ff 100%);
  color: white;
  padding: 2rem;
  text-align: center;
}

.avatar-container {
  margin-bottom: 0.5rem;
}

.avatar-container img {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  border: 4px solid white;
  object-fit: cover;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.user-name {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.user-time {
  font-size: 0.875rem;
  opacity: 0.9;
  font-family: 'Courier New', monospace;
}

.card-body {
  padding: 2rem;
}

.user-bio {
  font-size: 1rem;
  color: #4a5568;
  margin-bottom: 2rem;
  line-height: 1.7;
}

.social-links {
  margin-bottom: 2rem;
}

.social-links h3 {
  font-size: 1.125rem;
  color: #2d3748;
  margin-bottom: 1rem;
  font-weight: 600;
}

.social-links ul {
  list-style: none;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.social-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: #667eea;
  color: white;
  text-decoration: none;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.2s;
}

.social-links a:hover {
  background: #764ba2;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.social-links a:focus {
  outline: 2px solid #667eea;
  outline-offset: 2px;
}

.social-icons {
  max-width: 25px;
}

.info-section {
  margin-bottom: 1.5rem;
}

.info-section h3 {
  font-size: 1.125rem;
  color: #2d3748;
  margin-bottom: 0.75rem;
  font-weight: 600;
}

.info-section ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.info-section li {
  background: #edf2f7;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  color: #4a5568;
}

.hobbies-section li {
  background: #c6f6d5;
  color: #22543d;
}

.dislikes-section li {
  background: #fed7d7;
  color: #742a2a;
}

@media (max-width: 640px) {
  .card-header {
    padding: 1.5rem;
  }

  .user-name {
    font-size: 1.5rem;
  }

  .avatar-container img {
    width: 100px;
    height: 100px;
  }

  .card-body {
    padding: 1.5rem;
  }

  .social-links ul {
    flex-direction: column;
  }

  .social-links a {
    width: 100%;
    justify-content: center;
  }

  nav.main-nav ul {
    flex-direction: column;
  }

  nav.main-nav a {
    width: 100%;
    text-align: center;
  }
}

@media (min-width: 768px) {
  .card-body {
    padding: 2.5rem;
  }
}