body { margin: 0; background: #f3f6f8; color: #1c2833; font-family: "Segoe UI", Arial, sans-serif; }
.admin-shell { display: flex; min-height: 100vh; }
.admin-side { width: 15.5rem; background: #0b3a66; color: #fff; padding: 1rem .8rem 2rem; }
.admin-side .brand { color: #fff; font-weight: 700; text-decoration: none; display: block; margin-bottom: 1rem; }
.admin-side nav { display: flex; flex-direction: column; gap: .15rem; }
.admin-side a { color: #d5e4f2; text-decoration: none; padding: .35rem .5rem; border-radius: .4rem; font-size: .92rem; }
.admin-side a.active, .admin-side a:hover { background: rgba(255,255,255,.12); color: #fff; }
.admin-main { flex: 1; min-width: 0; }
.admin-top { display: flex; justify-content: space-between; gap: 1rem; padding: .8rem 1.2rem; background: #fff; border-bottom: 1px solid #d5e0ea; }
.admin-content { padding: 1.2rem; }
.stat { background: #fff; border: 1px solid #d5e0ea; border-radius: .8rem; padding: 1rem; }
.stat span { display: block; color: #526272; }
.stat strong { font-size: 1.6rem; color: #0b3a66; }
.thumb { height: 48px; width: auto; border-radius: .3rem; }
.login-body { min-height: 100vh; display: grid; place-items: center; background: #0b3a66; }
.login-card { width: min(26rem, calc(100% - 2rem)); background: #fff; border-radius: 1rem; padding: 1.4rem; }
.btn-primary { background: #0e6cbd; border-color: #0e6cbd; }
@media (max-width: 900px) {
  .admin-shell { display: block; }
  .admin-side { width: auto; }
  .admin-side nav { display: grid; grid-template-columns: 1fr 1fr; }
}