/* Chenggong Study — back-office */

body.admin-body {
  background: #f2f4f8;
  font-family: 'Inter', sans-serif;
}

.admin-layout {
  display: flex;
  min-height: 100vh;
}

.admin-sidebar {
  width: 250px;
  background: var(--brand-navy);
  color: #cfd7e6;
  flex-shrink: 0;
  padding: 20px 0;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}
.admin-brand {
  display: block;
  padding: 0 20px 20px;
}
.admin-nav {
  display: flex;
  flex-direction: column;
}
.admin-nav a {
  color: #cfd7e6;
  padding: 11px 22px;
  font-size: 0.92rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 10px;
}
.admin-nav a:hover,
.admin-nav a.active {
  background: rgba(255,255,255,.06);
  color: #fff;
}
.admin-nav hr {
  border-color: rgba(255,255,255,.1);
  margin: 10px 20px;
}

.admin-main {
  flex: 1;
  min-width: 0;
}
.admin-topbar {
  background: #fff;
  padding: 16px 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid #e6e9f0;
  position: sticky;
  top: 0;
  z-index: 10;
}
.admin-content {
  padding: 28px;
}

.kpi-card {
  background: #fff;
  border-radius: 14px;
  padding: 22px;
  box-shadow: 0 8px 24px rgba(16,32,58,.06);
  height: 100%;
}
.kpi-card .kpi-value {
  font-family: 'Poppins', sans-serif;
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--brand-heading);
}
.kpi-card .kpi-label {
  color: var(--text-muted);
  font-size: 0.85rem;
}
.kpi-card .kpi-icon {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(21,69,203,.08);
  color: var(--brand-secondary);
  margin-bottom: 14px;
}

.admin-panel {
  background: #fff;
  border-radius: 14px;
  padding: 24px;
  box-shadow: 0 8px 24px rgba(16,32,58,.06);
}

.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--brand-navy), #101d30);
}
.login-card {
  background: #fff;
  border-radius: 18px;
  padding: 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 30px 60px rgba(0,0,0,.3);
}

@media (max-width: 900px) {
  .admin-sidebar { display: none; }
  .admin-content { padding: 18px; }
}