body {
  margin: 0;
  font-family: system-ui, sans-serif;
  color: #1f2937;
  background: #f9fafb;
}

.layout {
  display: grid;
  grid-template-columns: 250px 1fr;
  height: 100vh;
}

/* Sidebar */
.sidebar {
  background: #111827;
  color: #f9fafb;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  overflow-y: auto;
}

.sidebar .logo {
  font-weight: bold;
  font-size: 1.2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid #374151;
}

#sidebar-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

#sidebar-nav li {
  margin: 0.5rem 0;
}

#sidebar-nav a {
  color: #d1d5db;
  text-decoration: none;
  padding: 0.4rem 0.6rem;
  display: block;
  border-radius: 6px;
}

#sidebar-nav a.active,
#sidebar-nav a:hover {
  background: #2563eb;
  color: white;
}

/* Content */
.content {
  padding: 2rem;
  overflow-y: auto;
}

#page-title {
  font-size: 1.8rem;
  font-weight: bold;
  margin-bottom: 1rem;
}

#page-content {
  line-height: 1.6;
}

#page-content h2 {
  margin-top: 1.5rem;
}

.footer-nav {
  margin-top: 2rem;
  display: flex;
  justify-content: space-between;
}

.footer-nav button {
  background: #2563eb;
  border: none;
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  cursor: pointer;
}

.footer-nav button:disabled {
  background: #9ca3af;
  cursor: not-allowed;
}