:root {
  --bg-color: #ffffff;
  --text-color: #000000;
  --card-color: #f2f2f2;
}

.dark {
  --bg-color: #121212;
  --text-color: #ffffff;
  --card-color: #1e1e1e;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
}

.dashboard {
  display: grid;
  grid-template-areas:
    "header header"
    "sidebar main"
    "footer footer";
  grid-template-columns: 200px 1fr;
  grid-template-rows: 60px 1fr 40px;
  height: 100vh;
}

.header {
  grid-area: header;
  background: var(--card-color);
  padding: 10px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sidebar {
  grid-area: sidebar;
  background: var(--card-color);
  padding: 20px;
}

.sidebar ul {
  list-style: none;
  padding: 0;
}

.sidebar li {
  margin: 15px 0;
}

.main {
  grid-area: main;
  padding: 20px;
}

.footer {
  grid-area: footer;
  background: var(--card-color);
  text-align: center;
  padding: 10px;
}