body {
  font-family: Arial, sans-serif;
  margin: 0;
  background-color: #f0f0f0;
}
nav {
  background-color: #4B2E2E;
  color: white;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
nav .nav-links {
  list-style: none;
  display: flex;
  gap: 1rem;
}
nav .nav-links li a {
  color: white;
  text-decoration: none;
  font-weight: bold;
}
main {
  padding: 2rem;
}
.dashboard-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 1.5rem;
}
.card {
  background: white;
  padding: 1rem;
  border-radius: 8px;
  box-shadow: 0 0 5px rgba(0,0,0,0.1);
}
.full-width {
  grid-column: span 3;
  margin-top: 2rem;
}
.tabs {
  margin-bottom: 1rem;
}
.tab-button {
  padding: 0.5rem 1rem;
  margin-right: 0.5rem;
  cursor: pointer;
  border: none;
  background-color: #ddd;
}
.tab-button.active {
  background-color: #4B2E2E;
  color: white;
}
table {
  width: 100%;
  border-collapse: collapse;
}
th, td {
  padding: 0.5rem;
  border: 1px solid #ccc;
}

/* Login Page Styles */
.login-body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: #eee;
}
.login-container {
  background: white;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  width: 300px;
}
.login-container input {
  width: 100%;
  padding: 0.5rem;
  margin-bottom: 1rem;
}
.login-container button {
  width: 100%;
  padding: 0.5rem;
  background-color: #4B2E2E;
  color: white;
  border: none;
  cursor: pointer;
}
.login-container .error-message {
  color: red;
  font-size: 0.9rem;
}