* { box-sizing: border-box; }
body { margin: 0; font-family: "Segoe UI", system-ui, sans-serif; background: #eef2ff; color: #0f172a; }
.admin-shell { max-width: 1200px; margin: 0 auto; padding: 20px; }
.admin-header { background: #fff; border-radius: 14px; padding: 20px 24px; box-shadow: 0 8px 24px rgba(15,23,42,.06); margin-bottom: 20px; }
.admin-header h1 { margin: 0 0 4px; font-size: 22px; }
.admin-header .sub { margin: 0 0 14px; color: #64748b; font-size: 13px; }
.admin-nav { display: flex; flex-wrap: wrap; gap: 8px; }
.admin-nav a { text-decoration: none; padding: 8px 14px; border-radius: 8px; font-size: 14px; color: #334155; background: #f1f5f9; }
.admin-nav a.active { background: #4f6ef7; color: #fff; }
.admin-nav a.logout { margin-left: auto; background: #fee2e2; color: #b91c1c; }
.admin-main { min-height: 420px; }
.admin-footer { text-align: center; color: #94a3b8; font-size: 12px; margin-top: 24px; }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; margin-bottom: 20px; }
.stat-card { background: #fff; border-radius: 12px; padding: 16px; box-shadow: 0 4px 16px rgba(15,23,42,.05); }
.stat-card .num { font-size: 28px; font-weight: 700; }
.stat-card .label { color: #64748b; font-size: 13px; margin-top: 4px; }
.stat-card.online .num { color: #16a34a; }
.stat-card.revoked .num { color: #dc2626; }
.panel { background: #fff; border-radius: 14px; padding: 20px; box-shadow: 0 8px 24px rgba(15,23,42,.06); margin-bottom: 20px; }
.panel h2 { margin: 0 0 16px; font-size: 18px; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th, td { padding: 10px 8px; border-bottom: 1px solid #e2e8f0; text-align: left; vertical-align: middle; }
th { color: #64748b; font-weight: 600; background: #f8fafc; }
.badge { display: inline-block; padding: 3px 8px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.badge.online { background: #dcfce7; color: #166534; }
.badge.offline { background: #f1f5f9; color: #475569; }
.badge.expired { background: #fef3c7; color: #92400e; }
.badge.revoked { background: #fee2e2; color: #991b1b; }
.btn { border: 0; border-radius: 8px; padding: 6px 10px; font-size: 12px; cursor: pointer; margin-right: 4px; }
.btn-danger { background: #ef4444; color: #fff; }
.btn-warn { background: #f59e0b; color: #fff; }
.btn-primary { background: #4f6ef7; color: #fff; }
.btn-ghost { background: #e2e8f0; color: #334155; }
.alert { padding: 12px 14px; border-radius: 8px; margin-bottom: 16px; }
.alert.success { background: #dcfce7; color: #166534; }
.alert.error { background: #fee2e2; color: #991b1b; }
.form-grid { display: grid; gap: 12px; max-width: 480px; }
.form-grid label { font-weight: 600; font-size: 14px; }
.form-grid input, .form-grid select { width: 100%; padding: 10px; border: 1px solid #cbd5e1; border-radius: 8px; }
.form-grid button { padding: 12px; border: 0; border-radius: 8px; background: #4f6ef7; color: #fff; font-weight: 600; cursor: pointer; }
.toolbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; flex-wrap: wrap; gap: 8px; }
.mono { font-family: Consolas, monospace; font-size: 12px; }
.hint { color: #64748b; font-size: 12px; }
.key { font-family: Consolas, monospace; color: #4f6ef7; font-weight: 700; word-break: break-all; }