body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f7f7f5;
  margin: 0;
  color: #2e2e2e;
}

.sidebar {
  width: 220px;
  position: fixed;
  top: 0; bottom: 0; left: 0;
  background: #1f1f1f;
  color: #fff;
  padding: 20px;
}

.sidebar h3 {
  color: #c9a14a;
  margin-bottom: 20px;
}

.sidebar a {
  display: block;
  color: #ddd;
  text-decoration: none;
  margin: 10px 0;
}

.sidebar a:hover {
  color: #c9a14a;
}

.header {
  margin-left: 240px;
  padding: 15px 25px;
  background: #fff;
  border-bottom: 1px solid #ddd;
}

.main {
  margin-left: 240px;
  padding: 25px;
}

.card {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
  margin-bottom: 20px;
}

.btn-primary {
  background: #c9a14a;
  color: #fff;
  padding: 8px 14px;
  border-radius: 6px;
  text-decoration: none;
  border: none;
}

.btn-primary:hover {
  background: #b08c3c;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: 10px;
  border-bottom: 1px solid #eee;
  text-align: left;
}

th {
  background: #fafafa;
}

@media (max-width: 768px) {
  .sidebar {
    position: relative;
    width: 100%;
  }
  .header, .main {
    margin-left: 0;
  }
}