body {
  margin: 0;
  font-family: 'Inter', 'Roboto', sans-serif;
  background: white;
  color: #333;
  transition: background 0.3s, color 0.3s;
}

.dark-theme {
  background: #1f1f1f;
  color: #e0e0e0;
}

header, footer {
  text-align: center;
  padding: 1rem;
}

.logo {
  width: 50px;
}

button {
  background: none;
  border: 1px solid #555;
  padding: 0.5rem 1rem;
  margin: 0.5rem;
  cursor: pointer;
  transition: box-shadow 0.3s;
}

button:hover {
  box-shadow: 0 0 5px rgba(100, 100, 255, 0.6);
}

input, textarea {
  width: 90%;
  margin: 0.5rem 0;
  padding: 0.5rem;
  font-size: 1rem;
}

textarea {
  height: 150px;
}

.hidden {
  display: none;
}

.articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  padding: 1rem;
}