:root {
  --primary: #1d3a8f;
  --primary-dark: #142a68;
  --accent: #ff7a00;
  --bg: #f4f6fb;
}
body { background: var(--bg); font-family: 'Segoe UI', Roboto, Arial, sans-serif; }
.wrapper { min-height: 100vh; }
.sidebar {
  width: 250px;
  background: linear-gradient(180deg, var(--primary), var(--primary-dark));
  color: #fff;
  min-height: 100vh;
  flex-shrink: 0;
  position: sticky;
  top: 0;
}
.sidebar-brand {
  padding: 20px;
  font-size: 1.05rem;
  font-weight: 700;
  border-bottom: 1px solid rgba(255,255,255,.15);
  display: flex; align-items: center; gap: 10px;
}
.brand-logo-img {
  width: 36px; height: 36px; border-radius: 50%; flex: 0 0 auto;
  background: #fff; object-fit: contain; padding: 2px;
  box-shadow: 0 4px 10px rgba(0,0,0,.25);
}
.login-logo {
  width: 64px; height: 64px; border-radius: 50%; object-fit: contain;
  background: #fff; padding: 4px; box-shadow: 0 8px 20px rgba(0,0,0,.15);
  border: 3px solid rgba(29,58,143,.15);
}
a.back-link {
  display: flex; align-items: center; justify-content: center; gap: .4rem;
  margin-top: 1.2rem; color: #6b7280; font-size: .85rem; text-decoration: none;
}
a.back-link:hover { color: var(--primary); }
.sidebar .nav-link {
  color: rgba(255,255,255,.85);
  padding: 10px 20px;
  border-left: 3px solid transparent;
  font-size: .93rem;
}
.sidebar .nav-link i { margin-right: 8px; width: 18px; display: inline-block; }
.sidebar .nav-link:hover, .sidebar .nav-link.active {
  background: rgba(255,255,255,.1);
  border-left-color: var(--accent);
  color: #fff;
}
.content { min-width: 0; }
.topbar {
  background: #fff;
  padding: 12px 20px;
  border-bottom: 1px solid #e5e7eb;
  position: sticky; top: 0; z-index: 10;
}
.card { border: none; border-radius: 12px; box-shadow: 0 2px 10px rgba(0,0,0,.05); }
.stat-card { border-radius: 14px; color: #fff; padding: 20px; }
.stat-card h2 { font-weight: 700; margin: 0; }
.bg-indigo { background: linear-gradient(135deg, #1d3a8f, #2e56c9); }
.bg-orange { background: linear-gradient(135deg, #ff7a00, #d96500); }
.bg-teal { background: linear-gradient(135deg, #0d8f6f, #086650); }
.bg-red { background: linear-gradient(135deg, #c0392b, #922016); }
.login-page {
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--primary), #6a2fc9);
}
.login-card { max-width: 400px; width: 100%; border-radius: 16px; }
.iku-card { border-left: 5px solid var(--primary); }
@media (max-width: 768px) {
  .sidebar { position: fixed; left: -260px; z-index: 1050; transition: left .2s; height: 100%; }
  .sidebar.show { left: 0; }
}