:root {
  --admin-sidebar: #0b1f3a;
  --admin-accent: #1d6fd8;
  --admin-bg: #f4f7fb;
}

body.admin-body {
  margin: 0;
  background: var(--admin-bg);
  font-family: "Segoe UI", system-ui, sans-serif;
}

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

.admin-sidebar {
  width: 250px;
  background: linear-gradient(180deg, #0b1f3a, #134a9c);
  min-height: 100vh;
}

.admin-brand {
  display: flex;
  align-items: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.admin-brand img {
  object-fit: contain;
  background: #fff;
  border-radius: 8px;
}

.admin-nav-heading {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 1rem 0.75rem 0.35rem;
  font-weight: 600;
}

.admin-nav-link {
  display: flex;
  align-items: center;
  color: rgba(255, 255, 255, 0.88);
  text-decoration: none;
  padding: 0.55rem 0.75rem;
  border-radius: 8px;
  margin-bottom: 2px;
  font-size: 0.9rem;
}

.admin-nav-link:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}

.admin-topbar {
  background: #fff;
  border-bottom: 1px solid #e9ecef;
  height: 60px;
}

.admin-content { min-height: calc(100vh - 60px); }

.admin-card {
  background: #fff;
  border-radius: 12px;
  border: 1px solid #e9ecef;
  padding: 1.5rem;
}

.stat-card {
  background: #fff;
  border-radius: 12px;
  border: 1px solid #e9ecef;
  padding: 1.25rem;
  text-align: center;
}

.stat-card .value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--admin-accent);
}

.stat-card .label {
  color: #6c757d;
  font-size: 0.9rem;
}

.login-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background:
    radial-gradient(700px 300px at 20% 0%, rgba(56, 189, 248, 0.25), transparent 60%),
    linear-gradient(160deg, #0b1f3a, #1d6fd8);
}

.login-card {
  width: min(420px, 92vw);
  background: #fff;
  border-radius: 18px;
  padding: 2rem;
  box-shadow: 0 24px 50px rgba(0, 0, 0, 0.2);
}

.btn-nx-admin {
  background: linear-gradient(135deg, #1d6fd8, #0ea5e9);
  border: 0;
  color: #fff;
  padding: 0.7rem 1rem;
  border-radius: 10px;
}

.btn-nx-admin:hover {
  color: #fff;
  opacity: 0.95;
}

@media (max-width: 900px) {
  .admin-shell { flex-direction: column; }
  .admin-sidebar { width: 100%; min-height: auto; }
}