* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  background: #f5f7fb;
  color: #111827;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.admin-sidebar {
  width: 240px;
  background: #101827;
  color: #fff;
  flex-shrink: 0;
  min-height: 100vh;
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
}

.admin-brand {
  padding: 24px 22px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.admin-brand-title {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: .5px;
}

.admin-brand-subtitle {
  margin-top: 6px;
  font-size: 12px;
  color: #9ca3af;
}

.admin-nav {
  padding: 16px 12px;
}

.admin-nav a {
  display: block;
  padding: 12px 14px;
  border-radius: 10px;
  margin-bottom: 6px;
  color: #d1d5db;
  font-size: 14px;
}

.admin-nav a:hover {
  background: rgba(255,255,255,0.08);
  color: #fff;
}

.admin-nav a.active {
  background: #2563eb;
  color: #fff;
}

.admin-main {
  margin-left: 240px;
  width: calc(100% - 240px);
  min-height: 100vh;
}

.admin-topbar {
  height: 64px;
  background: #fff;
  border-bottom: 1px solid #e5e7eb;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  position: sticky;
  top: 0;
  z-index: 10;
}

.admin-page-title {
  font-size: 20px;
  font-weight: 700;
}

.admin-topbar-right {
  font-size: 13px;
  color: #6b7280;
}

.admin-content {
  padding: 28px;
}

.admin-card {
  background: #fff;
  border-radius: 16px;
  border: 1px solid #e5e7eb;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.04);
  padding: 22px;
  margin-bottom: 20px;
}

.admin-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(160px, 1fr));
  gap: 18px;
}

.stat-card {
  background: #fff;
  border-radius: 16px;
  border: 1px solid #e5e7eb;
  padding: 22px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.04);
}

.stat-label {
  color: #6b7280;
  font-size: 13px;
}

.stat-value {
  margin-top: 10px;
  font-size: 30px;
  font-weight: 800;
}

.quick-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(220px, 1fr));
  gap: 18px;
}

.quick-card {
  background: #fff;
  border-radius: 16px;
  border: 1px solid #e5e7eb;
  padding: 22px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.04);
  transition: .15s;
}

.quick-card:hover {
  transform: translateY(-2px);
  border-color: #2563eb;
}

.quick-title {
  font-size: 17px;
  font-weight: 700;
}

.quick-desc {
  margin-top: 8px;
  color: #6b7280;
  font-size: 13px;
  line-height: 1.5;
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
}

.admin-table th,
.admin-table td {
  padding: 12px 14px;
  border-bottom: 1px solid #e5e7eb;
  text-align: left;
  font-size: 14px;
}

.admin-table th {
  background: #f9fafb;
  color: #374151;
}

.admin-btn {
  display: inline-block;
  padding: 8px 12px;
  border-radius: 9px;
  border: 1px solid #d1d5db;
  background: #fff;
  font-size: 13px;
  cursor: pointer;
}

.admin-btn.primary {
  background: #2563eb;
  border-color: #2563eb;
  color: #fff;
}

.admin-btn.danger {
  background: #dc2626;
  border-color: #dc2626;
  color: #fff;
}

.admin-btn.success {
  background: #16a34a;
  border-color: #16a34a;
  color: #fff;
}

.admin-form input,
.admin-form textarea,
.admin-form select {
  width: 100%;
  padding: 10px 12px;
  border-radius: 9px;
  border: 1px solid #d1d5db;
  font-size: 14px;
}

.admin-form label {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  color: #374151;
  font-weight: 600;
}

.admin-form-row {
  margin-bottom: 16px;
}

@media (max-width: 900px) {
  .admin-sidebar {
    position: static;
    width: 100%;
    min-height: auto;
  }

  .admin-shell {
    display: block;
  }

  .admin-main {
    margin-left: 0;
    width: 100%;
  }

  .admin-grid,
  .quick-grid {
    grid-template-columns: 1fr;
  }
}