/* Light Mode */
body {
  font-family: Arial, sans-serif;
  background-color: #f4f4f4;
  color: #333;
  margin: 0;
  padding: 0;
  transition: background 0.3s, color 0.3s;
}

.container {
  max-width: 700px;
  margin: 2rem auto;
  background: #fff;
  padding: 2rem;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  border-radius: 8px;
}

header h1 {
  margin: 0;
  font-size: 2rem;
}

header p {
  margin: 0.2rem 0 1rem;
  color: #666;
}

header button {
  margin-top: 1rem;
  padding: 0.4rem 0.8rem;
  background: #1a73e8;
  color: #fff;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

header button:hover {
  background: #155ab6;
}

section {
  margin-bottom: 1.5rem;
}

section h2 {
  border-bottom: 2px solid #1a73e8;
  padding-bottom: 0.3rem;
  margin-bottom: 0.5rem;
  color: #1a73e8;
}

ul {
  list-style-type: none;
  padding-left: 0;
}

ul li {
  margin-bottom: 0.4rem;
}

ul li a {
  color: #1a73e8;
  text-decoration: none;
}

ul li a:hover {
  text-decoration: underline;
}

/* Dark Mode */
body.dark-mode {
  background-color: #121212;
  color: #e0e0e0;
}

body.dark-mode .container {
  background-color: #1e1e1e;
  box-shadow: 0 0 10px rgba(255,255,255,0.05);
}

body.dark-mode section h2 {
  color: #4fc3f7;
  border-color: #4fc3f7;
}

body.dark-mode header button {
  background: #4fc3f7;
  color: #121212;
}

body.dark-mode header button:hover {
  background: #34b3f0;
}