body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f4f4f4;
}
.main-header {
  background: #333;
  color: #fff;
  padding: 1rem;
}
.nav-container { display: flex; justify-content: space-between; align-items: center; }
.logo span { color: #00bcd4; }
.nav-list { list-style: none; display: flex; gap: 1rem; }
.nav-list a { color: white; text-decoration: none; }
.container { max-width: 800px; margin: 2rem auto; }
.card-section { background: #fff; padding: 1rem; margin-bottom: 1rem; border-radius: 5px; }
.form-section { margin-top: 1rem; }
input, textarea, button {
  width: 100%;
  padding: 0.75rem;
  margin: 0.5rem 0;
  border: 1px solid #ccc;
  border-radius: 4px;
}
button { cursor: pointer; background: #00bcd4; color: white; border: none; }
.auth-container {
  max-width: 400px;
  margin: 5rem auto;
  background: #fff;
  padding: 2rem;
  border-radius: 5px;
}
.posts-list p { background: #eef; padding: 0.5rem; border-radius: 3px; margin: 0.5rem 0; }
.hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4rem 2rem;
  background: #fff;
}
.hero-content { max-width: 50%; }
.hero-content h1 { font-size: 3rem; margin-bottom: 1rem; }
.hero-ctas .btn-primary,
.hero-ctas .btn-secondary {
  display: inline-block;
  margin-right: 1rem;
  padding: 0.75rem 1.5rem;
  border-radius: 4px;
  text-decoration: none;
}
.btn-primary { background: #00bcd4; color: #fff; }
.btn-secondary { background: #333; color: #fff; }
.features { padding: 3rem 2rem; background: #f9f9f9; }
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}
.feature-card { text-align: center; }
.cta-banner {
  padding: 2rem;
  text-align: center;
  background: #00bcd4;
  color: white;
}