:root {
  --primary: #0d6efd;
  --bg: #f5f7fb;
  --text: #1c1f2a;
  --panel: #ffffff;
  --muted: #6c757d;
}

body {
  font-family: "Segoe UI", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
}

.app-shell {
  min-height: 100vh;
}

.topbar {
  background: linear-gradient(120deg, #1b3a57, #2b6cb0);
  color: #fff;
  padding: 12px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sidebar {
  background: var(--panel);
  border-right: 1px solid #e5e7eb;
  min-height: calc(100vh - 56px);
  padding: 16px;
}

.content {
  padding: 1px;
}

.card-box {
  background: var(--panel);
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 10px 30px rgba(16, 24, 40, 0.08);
}

.menu-title {
  font-weight: 600;
  margin-top: 12px;
}

.menu-item {
  cursor: pointer;
  color: var(--primary);
}

.menu-item:hover {
  text-decoration: underline;
}