:root {
  --bg-light: #ffffff;
  --text-light: #000000;
  --bg-dark: #1e1e1e;
  --text-dark: #f1f1f1;
  --bg-soft: #f2f6e9;
  --text-soft: #2f2f2f;
  --font-main: 'Segoe UI', sans-serif;
  --transition-fast: 0.3s;
}

body {
  font-family: var(--font-main);
  margin: 0;
  padding: 0;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

body.light {
  background-color: var(--bg-light);
  color: var(--text-light);
}

body.dark {
  background-color: var(--bg-dark);
  color: var(--text-dark);
}

body.soft {
  background-color: var(--bg-soft);
  color: var(--text-soft);
}

.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  min-height: 100vh;
  text-align: center;
}

input, button, select {
  padding: 12px;
  font-size: 16px;
  border-radius: 6px;
  border: 1px solid #ccc;
  margin: 10px 0;
  width: 100%;
  max-width: 300px;
}

button {
  background-color: #4caf50;
  color: white;
  cursor: pointer;
  border: none;
}

button:hover {
  background-color: #43a047;
}

.fade-in {
  animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}