body.admin-mode { background: #f1f5f9; }
.admin-mode .page-shell { width: 100%; padding: 0; }
.admin-mode .app-header, .admin-mode .app-version { display: none; }
.admin-shell { display: grid; grid-template-columns: 260px minmax(0, 1fr); min-height: 100vh; }
.admin-sidebar { position: sticky; top: 0; display: flex; flex-direction: column; height: 100vh; padding: 24px 18px; background: #172033; color: #e2e8f0; }
.admin-brand { padding: 4px 10px; font-size: 18px; font-weight: 800; letter-spacing: .01em; }
.admin-divider { height: 1px; margin: 18px 0; background: rgba(148, 163, 184, .28); }
.admin-nav { display: grid; gap: 5px; }
.admin-nav-link { display: block; padding: 11px 12px; border-radius: 8px; color: #cbd5e1; text-decoration: none; font-weight: 650; }
.admin-nav-link:hover, .admin-nav-link.is-active { color: #fff; background: #2563eb; }
.admin-sidebar-actions { display: grid; gap: 8px; margin-top: auto; }
.admin-sidebar-actions button { min-height: 44px; padding: 9px 12px; border: 1px solid rgba(203, 213, 225, .35); border-radius: 8px; color: #e2e8f0; background: transparent; font-family: inherit; font-size: 15px; font-weight: 650; text-align: left; cursor: pointer; }
.admin-sidebar-actions button:hover { background: rgba(148, 163, 184, .14); }
.admin-content { min-width: 0; padding: 36px clamp(24px, 4vw, 56px); }
.admin-content-header { margin-bottom: 28px; }
.admin-content-header p { margin: 0 0 5px; color: #64748b; font-size: 14px; font-weight: 750; text-transform: uppercase; letter-spacing: .08em; }
.admin-content-header h1 { margin: 0; font-size: 30px; }
.admin-card-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.admin-stat-card, .admin-activity-card, .admin-placeholder { padding: 22px; border: 1px solid #e2e8f0; border-radius: 12px; background: #fff; box-shadow: 0 5px 18px rgba(15, 23, 42, .06); }
.admin-stat-card p { margin: 0; color: #64748b; font-size: 14px; font-weight: 700; }
.admin-stat-card strong { display: block; margin-top: 14px; font-size: 30px; }
.admin-activity-card, .admin-placeholder { margin-top: 18px; }
.admin-activity-card h2, .admin-placeholder h2 { margin: 0; font-size: 19px; }
.admin-activity-card p, .admin-placeholder p { margin: 14px 0 0; color: #64748b; }
.admin-placeholder { min-height: 220px; }
@media (max-width: 900px) { .admin-card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 640px) { .admin-shell { grid-template-columns: 1fr; } .admin-sidebar { position: relative; height: auto; } .admin-content { padding: 24px 18px; } .admin-card-grid { grid-template-columns: 1fr; } }