:root {
  --bg-color: #f0f2f5;
  --text-color: #333;
  --container-bg: #ffffff;
  --card-bg: #f8f9fa;
  --header-color: #2c3e50;
  --shadow-color: rgba(0,0,0,0.1);
}

[data-theme="dark"] {
  --bg-color: #121212;
  --text-color: #e0e0e0;
  --container-bg: #1e1e1e;
  --card-bg: #2d2d2d;
  --header-color: #ffffff;
  --shadow-color: rgba(0,0,0,0.4);
}

body {
  font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  margin: 0;
  padding: 20px;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background-color 0.3s ease, color 0.3s ease;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start; /* Better for scrolling on mobile */
  box-sizing: border-box;
}

h1 {
  color: var(--header-color);
  margin-top: 2rem;
  margin-bottom: 1.5rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-size: 1.5rem; /* Slightly smaller for mobile */
  text-align: center;
}

@media (min-width: 600px) {
  body {
    padding: 50px 20px;
    justify-content: center;
  }
  h1 {
    font-size: 2rem;
    margin-top: 0;
    margin-bottom: 2rem;
  }
}

footer {
  margin-top: 3rem;
  font-size: 0.9rem;
  color: var(--text-color);
  opacity: 0.6;
  font-style: italic;
  letter-spacing: 0.5px;
}