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768px){.readings-filters{flex-direction:column;align-items:flex-start}.readings-date-range{flex-wrap:wrap}}.devices-page{animation:fade-in-down .3s ease both}.devices-mqtt-title{font-size:.85rem;font-weight:600;color:var(--text-secondary);margin:1.5rem 0 1rem;padding-top:1rem;border-top:1px solid var(--border-color)}.devices-form-row{display:grid;grid-template-columns:1fr 1fr;gap:1rem}.settings-page{animation:fade-in-down .3s ease both}.settings-card{max-width:480px}.settings-form{display:flex;flex-direction:column}.settings-success{background:var(--success-bg);color:var(--success-text);padding:.75rem 1rem;border-radius:var(--radius-sm);font-size:.875rem;border:1px solid rgba(16,185,129,.2)}.users-page{animation:fade-in-down .3s ease both}.users-role-select{padding:4px 8px;border:1px solid var(--border-color);border-radius:var(--radius-sm);font-size:.8rem;background:var(--card-bg);cursor:pointer}.tenants-page{animation:fade-in-down .3s ease both}.tenants-period-row{display:grid;grid-template-columns:1fr 1fr;gap:1rem}@media (max-width: 600px){.tenants-period-row{grid-template-columns:1fr}}:root{--font-body: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, sans-serif;--font-display: "Syne", sans-serif;--font-code: source-code-pro, Menlo, Monaco, "Courier New", monospace;--bg-primary: #f8fafc;--bg-secondary: #f1f5f9;--card-bg: #ffffff;--card-bg-secondary: #f8fafc;--text-primary: #1e293b;--text-secondary: #64748b;--text-muted: #94a3b8;--border-color: #e2e8f0;--input-border: #e0e0e0;--input-bg: #fafafa;--primary: #667eea;--primary-dark: #764ba2;--success: #10b981;--success-bg: #d1fae5;--success-text: #065f46;--warning: #f59e0b;--warning-bg: #fef3c7;--warning-text: #92400e;--danger: #ef4444;--danger-bg: #fee2e2;--danger-text: #991b1b;--info: #3b82f6;--info-bg: #dbeafe;--info-text: #1e40af;--sidebar-width: 240px;--sidebar-collapsed-width: 64px;--topbar-height: 64px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 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