body {
  margin: 0;
  font-family: 'Segoe UI', Arial, sans-serif;
  background: #f4f4f4;
  color: #222;
  transition: background 0.3s, color 0.3s;
}

header .navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #222;
  color: #fff;
  padding: 1rem 2rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  letter-spacing: 1px;
}

#darkmode-toggle {
  background: none;
  border: none;
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
  transition: color 0.2s;
}

main {
  max-width: 600px;
  margin: 4rem auto 0 auto;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.07);
  padding: 2.5rem 2rem;
  text-align: center;
}

h1 {
  margin-top: 0;
  font-size: 2.5rem;
  color: #333;
}

h2 {
  color: #666;
  margin-bottom: 1.5rem;
}

.darkmode {
  background: #181a1b;
  color: #e0e0e0;
}

.darkmode header .navbar {
  background: #181a1b;
  color: #e0e0e0;
}

.darkmode main {
  background: #232526;
  color: #e0e0e0;
}

.darkmode h1 {
  color: #fff;
}

.darkmode h2 {
  color: #b0b0b0;
}

.darkmode #darkmode-toggle {
  color: #ffd700;
}