:root {
  --primary-blue: #2563eb;
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --border-color: #e2e8f0;
}

[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --border-color: #334155;
}

body {
  font-family: 'Ubuntu', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: all 0.3s ease;
}

.theme-toggle {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  width: 50px;
  height: 26px;
  position: relative;
  cursor: pointer;
  margin-left: 1rem;
}

.theme-toggle-slider {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 22px;
  height: 22px;
  background: var(--primary-blue);
  border-radius: 50%;
  transition: transform 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 12px;
}

[data-theme="dark"] .theme-toggle-slider {
  transform: translateX(24px);
}