/* Estilos críticos para primera carga */
        .loading-screen {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: #000;
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 9999;
            transition: opacity 0.5s ease;
        }
        
        .logo-loading {
            width: 150px;
            height: auto;
            animation: pulse 2s infinite;
        }
        
        @keyframes pulse {
            0% { opacity: 0.7; transform: scale(0.95); }
            50% { opacity: 1; transform: scale(1); }
            100% { opacity: 0.7; transform: scale(0.95); }
        }
        
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }
        
        /* Mejoras de accesibilidad */
        a:focus,
        button:focus {
            outline: 2px solid #4A90E2;
            outline-offset: 2px;
        }
        
        .skip-link {
            position: absolute;
            top: -40px;
            left: 6px;
            background: #000;
            color: white;
            padding: 8px;
            z-index: 10000;
            text-decoration: none;
        }
        
        .skip-link:focus {
            top: 6px;
        }