:root {
  --sidebar-bg: #1e293b;
  --sidebar-text: #cbd5e1;
  --sidebar-active: #fff;
}

body {
  background: #f8fafc;
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  overflow-x: hidden;
}

.sidebar {
  width: 230px;
  height: 100vh;
  background: var(--sidebar-bg);
  padding: 1.25rem;
  position: fixed;
  color: var(--sidebar-text);
}

.sidebar h4 {
  color: var(--sidebar-active);
}

.sidebar a {
  display: block;
  text-decoration: none;
  color: var(--sidebar-text);
  padding: 0.6rem 0.8rem;
  border-radius: 6px;
  margin-bottom: 0.3rem;
  transition: background 0.2s, color 0.2s;
}

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

.content {
  margin-left: 230px;
  padding: 1.5rem;
  min-height: 100vh;
}

.card {
  border: none;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}