:root {
  --dark: #0E3746;
  --cream: #EAE8DC;
  --light: #F4F2EC;
  --red: #BE2623;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', sans-serif;
}

body {
  background: var(--cream);
  color: #333;
}

a {
  text-decoration: none;
  color: inherit;
}

.btn {
  padding: 10px 16px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
}

.btn-danger {
  background: var(--red);
  color: white;
}

.sidebar {
  width: 220px;
  background: var(--dark);
  color: white;
  padding: 20px;
  position: fixed;
  height: 100%;
  transition: left 0.3s ease;
}

.sidebar a {
  display: block;
  margin: 12px 0;
  padding: 10px;
  border-radius: 6px;
}

.sidebar a:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.topbar {
  background: var(--light);
  padding: 14px 20px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.content {
  margin-left: 220px;
  padding: 20px;
}

.card {
  background: white;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  margin-bottom: 20px;
}

/* Responsive menu ẩn */
.menu-toggle {
  display: none;
}

@media (max-width: 768px) {
  .sidebar {
    position: absolute;
    left: -220px;
    top: 0;
    height: 100vh;
    z-index: 10;
  }
  .sidebar.active {
    left: 0;
  }
  .content {
    margin-left: 0;
  }
  .menu-toggle {
    display: inline-block;
    font-size: 24px;
    background: none;
    border: none;
    margin-right: 12px;
    cursor: pointer;
  }
}