:root {
  --bg-light: #fefefe;
  --text-light: #222;
  --bg-dark: #1a1a1a;
  --text-dark: #f1f1f1;
  --accent: #3f51b5;
}

[data-theme="light"] {
  background-color: var(--bg-light);
  color: var(--text-light);
}

[data-theme="dark"] {
  background-color: var(--bg-dark);
  color: var(--text-dark);
}

body {
  margin: 0;
  font-family: sans-serif;
  text-align: center;
  transition: background 0.4s ease, color 0.4s ease;
}

.container {
  padding: 1.5rem;
}

.logo {
  font-size: 3rem;
  margin-bottom: 0.2rem;
  color: var(--accent);
}

.subtitle {
  font-size: 1.2rem;
  margin-bottom: 2rem;
}

.clocks {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 25px;
  margin-bottom: 2rem;
}

.clock-block {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.dates {
  margin: 2rem 0;
  font-size: 1.2rem;
}

.contact .btn {
  display: inline-block;
  margin: 0.5rem;
  padding: 10px 20px;
  background-color: var(--accent);
  color: white;
  text-decoration: none;
  border-radius: 30px;
  transition: 0.3s ease;
}

.contact .btn:hover {
  background-color: #2c3e9c;
}

#toggle-theme {
  margin-top: 2rem;
  padding: 8px 16px;
  border: none;
  border-radius: 25px;
  background-color: #ccc;
  cursor: pointer;
}