* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  background: #f3f4f6;
  color: #111827;
}

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

button,
input,
textarea {
  font: inherit;
}

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

.sidebar {
  width: 280px;
  background: #0f172a;
  color: #e2e8f0;
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 28px;
}

.brand-mark {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: linear-gradient(135deg, #22c55e, #16a34a);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 700;
}

.brand-title {
  font-size: 18px;
  font-weight: 700;
}

.brand-subtitle {
  margin-top: 4px;
  font-size: 13px;
  color: #94a3b8;
}

.nav-menu {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.nav-link {
  padding: 14px 16px;
  border-radius: 14px;
  color: #cbd5e1;
  transition: all 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
  background: rgba(34, 197, 94, 0.14);
  color: #dcfce7;
}

.sidebar-footer {
  margin-top: auto;
}

.admin-card {
  padding: 16px;
  border-radius: 16px;
  background: rgba(148, 163, 184, 0.08);
}

.admin-name {
  font-size: 16px;
  font-weight: 700;
}

.admin-email {
  margin-top: 6px;
  font-size: 13px;
  color: #94a3b8;
}

.logout-link {
  display: block;
  margin-top: 16px;
  text-align: center;
  padding: 12px 14px;
  border-radius: 12px;
  background: rgba(239, 68, 68, 0.12);
  color: #fecaca;
}

.main-content {
  flex: 1;
  padding: 28px;
}

.topbar {
  margin-bottom: 24px;
}

.topbar h1 {
  margin: 0;
  font-size: 30px;
}

.topbar p {
  margin: 8px 0 0;
  color: #64748b;
}

.flash {
  margin-bottom: 20px;
  padding: 16px 18px;
  border-radius: 16px;
}

.flash-success {
  background: #dcfce7;
  color: #166534;
}

.flash-error {
  background: #fee2e2;
  color: #991b1b;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-bottom: 24px;
}

.stat-card,
.panel,
.table-panel,
.form-panel,
.login-panel {
  background: #ffffff;
  border-radius: 22px;
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
}

.stat-card {
  padding: 22px;
}

.stat-label {
  color: #64748b;
  font-size: 14px;
}

.stat-value {
  margin-top: 14px;
  font-size: 34px;
  font-weight: 700;
}

.stat-meta {
  margin-top: 8px;
  font-size: 14px;
  color: #16a34a;
}

.content-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 20px;
}

.panel,
.table-panel,
.form-panel {
  padding: 24px;
}

.panel h2,
.table-panel h2,
.form-panel h2 {
  margin: 0 0 18px;
  font-size: 22px;
}

.table {
  width: 100%;
  border-collapse: collapse;
}

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

.table th {
  color: #64748b;
  font-size: 14px;
  font-weight: 600;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group.full {
  grid-column: 1 / -1;
}

.form-group label {
  color: #334155;
  font-weight: 600;
}

.input,
.textarea,
.select {
  width: 100%;
  border: 1px solid #d1d5db;
  border-radius: 14px;
  padding: 12px 14px;
  background: #ffffff;
  color: #111827;
}

.textarea {
  min-height: 120px;
  resize: vertical;
}

.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.checkbox-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px;
  border-radius: 14px;
  background: #f8fafc;
}

.button-row {
  display: flex;
  gap: 12px;
  margin-top: 22px;
}

.button,
.secondary-button {
  border: none;
  border-radius: 14px;
  padding: 12px 20px;
  cursor: pointer;
}

.button {
  background: linear-gradient(135deg, #16a34a, #22c55e);
  color: #ffffff;
}

.secondary-button {
  background: #e2e8f0;
  color: #1e293b;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
}

.badge-success {
  background: #dcfce7;
  color: #166534;
}

.badge-muted {
  background: #e2e8f0;
  color: #475569;
}

.login-shell {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 28px;
  background: linear-gradient(135deg, #ecfdf5, #eff6ff);
}

.login-panel {
  width: 100%;
  max-width: 420px;
  padding: 34px;
}

.login-title {
  margin: 0;
  font-size: 28px;
}

.login-subtitle {
  margin-top: 10px;
  margin-bottom: 24px;
  color: #64748b;
}

.login-footer {
  margin-top: 20px;
  color: #64748b;
  font-size: 13px;
  text-align: center;
}

.empty-state {
  padding: 28px;
  border-radius: 18px;
  background: #f8fafc;
  color: #64748b;
  text-align: center;
}

.muted {
  color: #64748b;
}

@media (max-width: 1200px) {
  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .content-grid,
  .form-grid,
  .checkbox-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 860px) {
  .admin-shell {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
  }
}