* { box-sizing: border-box; font-family: system-ui, Arial }
body { margin:0; background:#f4f6fb }

.app {
  display:flex;
  min-height:100vh;
}

/* SIDEBAR */
.sidebar {
  width:240px;
  background:#1e293b;
  color:#fff;
  padding:20px;
}
.sidebar h2 {
  font-size:18px;
  margin:0 0 20px;
}
.sidebar a {
  display:block;
  padding:10px 12px;
  color:#cbd5e1;
  text-decoration:none;
  border-radius:6px;
  margin-bottom:4px;
}
.sidebar a:hover,
.sidebar a.active {
  background:#334155;
  color:#fff;
}

/* CONTENT */
.main {
  flex:1;
  padding:24px;
}
.header {
  background:#fff;
  padding:16px 20px;
  border-radius:10px;
  margin-bottom:20px;
  display:flex;
  justify-content:space-between;
  align-items:center;
  box-shadow:0 2px 6px rgba(0,0,0,.06);
}

.card {
  background:#fff;
  padding:20px;
  border-radius:12px;
  box-shadow:0 4px 12px rgba(0,0,0,.08);
}
.menu-group {
  margin-top:14px;
}

.menu-title {
  display:block;
  font-size:12px;
  color:#94a3b8;
  margin:8px 0 4px;
  text-transform:uppercase;
  letter-spacing:.5px;
}

.sidebar a {
  display:block;
  padding:9px 12px;
  color:#cbd5e1;
  text-decoration:none;
  border-radius:6px;
  font-size:14px;
}

.sidebar a:hover {
  background:#334155;
  color:#fff;
}