.oi-admin {
  margin: 0;
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: 100vh;
  background: #f4f6f8;
  font-family: system-ui, sans-serif;
}
.oi-admin-sidebar {
  background: #0f172a;
  color: #e2e8f0;
  padding: 24px 16px;
}
.oi-admin-sidebar .brand {
  font-weight: 700;
  margin-bottom: 24px;
  font-size: 1.1rem;
}
.oi-admin-sidebar nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.oi-admin-sidebar a {
  color: #cbd5e1;
  text-decoration: none;
  padding: 8px 10px;
  border-radius: 8px;
}
.oi-admin-sidebar a:hover { background: rgba(255,255,255,.08); color: #fff; }
.oi-admin-main { padding: 28px; }
.oi-panel {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 16px;
}
.oi-stat {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 18px;
}
.oi-admin-login {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at 20% 20%, rgba(11,110,79,.15), transparent 40%),
    #0f172a;
}
.oi-login-card {
  width: min(400px, 92vw);
  background: #fff;
  border-radius: 16px;
  padding: 28px;
}
@media (max-width: 900px) {
  .oi-admin { grid-template-columns: 1fr; }
  .oi-admin-sidebar { position: sticky; top: 0; z-index: 5; }
}