/* Variables CSS para diseño consistente */
        :root {
            --color-primario: #4F46E5;
            --color-secundario: #06B6D4;
            --color-acento: #F59E0B;
            --color-fondo: #F5F5F5;
            --color-texto: #333333;
            --color-texto-claro: #666666;
            --color-borde: #E5E7EB;
            --color-exito: #10B981;
            --color-advertencia: #F59E0B;
            --color-error: #EF4444;
            --sombra: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
            --sombra-hover: 0 8px 15px -3px rgba(0, 0, 0, 0.1);
            --radio: 8px;
            --transicion: all 0.3s ease;
        }

        /* Reset y estilos base */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background-color: var(--color-fondo);
            color: var(--color-texto);
            line-height: 1.6;
            min-height: 100vh;
        }

        /* Header y navegación */
        .header {
            background: white;
            box-shadow: var(--sombra);
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1rem;
        }

        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 0;
        }

        .logo {
            font-size: 1.5rem;
            font-weight: bold;
            color: var(--color-primario);
        }

        .nav-menu {
            display: flex;
            gap: 0.5rem;
            overflow-x: auto;
            padding: 0.5rem 0;
        }

        .nav-btn {
            padding: 0.75rem 1rem;
            background: transparent;
            border: 2px solid var(--color-borde);
            border-radius: var(--radio);
            cursor: pointer;
            white-space: nowrap;
            transition: var(--transicion);
            font-weight: 500;
            color: var(--color-texto);
        }

        .nav-btn:hover {
            border-color: var(--color-primario);
            background: var(--color-primario);
            color: white;
        }

        .nav-btn.active {
            background: var(--color-primario);
            color: white;
            border-color: var(--color-primario);
        }

        /* Layout principal */
        .main-content {
            padding: 2rem 0;
            min-height: calc(100vh - 120px);
        }

        .section {
            display: none;
            animation: fadeIn 0.3s ease-in-out;
        }

        .section.active {
            display: block;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .section-title {
            font-size: 2rem;
            font-weight: bold;
            margin-bottom: 1.5rem;
            color: var(--color-primario);
            text-align: center;
        }

        .section-description {
            text-align: center;
            color: var(--color-texto-claro);
            margin-bottom: 2rem;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

        /* Grid de contenido */
        .content-grid {
            display: grid;
            gap: 2rem;
            margin-bottom: 2rem;
        }

        .content-card {
            background: white;
            border-radius: var(--radio);
            padding: 1.5rem;
            box-shadow: var(--sombra);
            transition: var(--transicion);
        }

        .content-card:hover {
            box-shadow: var(--sombra-hover);
        }

        .card-title {
            font-size: 1.25rem;
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--color-primario);
        }

        .card-content {
            color: var(--color-texto-claro);
        }

        /* Botones */
        .btn {
            padding: 0.75rem 1.5rem;
            border: none;
            border-radius: var(--radio);
            cursor: pointer;
            font-weight: 500;
            transition: var(--transicion);
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }

        .btn-primary {
            background: var(--color-primario);
            color: white;
        }

        .btn-primary:hover {
            background: #4338CA;
        }

        .btn-secondary {
            background: var(--color-secundario);
            color: white;
        }

        .btn-secondary:hover {
            background: #0891B2;
        }

        .btn-accent {
            background: var(--color-acento);
            color: white;
        }

        .btn-accent:hover {
            background: #D97706;
        }

        .btn-outline {
            background: transparent;
            border: 2px solid var(--color-primario);
            color: var(--color-primario);
        }

        .btn-outline:hover {
            background: var(--color-primario);
            color: white;
        }

        .btn-small {
            padding: 0.5rem 1rem;
            font-size: 0.875rem;
        }

        .btn-large {
            padding: 1rem 2rem;
            font-size: 1.125rem;
        }

        /* Formularios */
        .form-group {
            margin-bottom: 1rem;
        }

        .form-label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 500;
            color: var(--color-texto);
        }

        .form-input {
            width: 100%;
            padding: 0.75rem;
            border: 2px solid var(--color-borde);
            border-radius: var(--radio);
            font-size: 1rem;
            transition: var(--transicion);
        }

        .form-input:focus {
            outline: none;
            border-color: var(--color-primario);
            box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
        }

        .form-select {
            width: 100%;
            padding: 0.75rem;
            border: 2px solid var(--color-borde);
            border-radius: var(--radio);
            font-size: 1rem;
            background: white;
            cursor: pointer;
        }

        /* Estados de carga */
        .loading {
            display: inline-block;
            width: 20px;
            height: 20px;
            border: 2px solid var(--color-borde);
            border-radius: 50%;
            border-top-color: var(--color-primario);
            animation: spin 1s ease-in-out infinite;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .header-content {
                flex-direction: column;
                gap: 1rem;
            }

            .nav-menu {
                width: 100%;
                justify-content: center;
            }

            .nav-btn {
                padding: 0.5rem 0.75rem;
                font-size: 0.875rem;
            }

            .section-title {
                font-size: 1.5rem;
            }

            .content-grid {
                gap: 1rem;
            }

            .content-card {
                padding: 1rem;
            }
        }

        @media (max-width: 480px) {
            .container {
                padding: 0 0.5rem;
            }

            .main-content {
                padding: 1rem 0;
            }

            .btn {
                padding: 0.75rem 1rem;
                font-size: 0.875rem;
            }
        }

        /* Utilidades */
        .hidden {
            display: none !important;
        }

        .text-center {
            text-align: center;
        }

        .text-success {
            color: var(--color-exito);
        }

        .text-warning {
            color: var(--color-advertencia);
        }

        .text-error {
            color: var(--color-error);
        }

        .mb-1 { margin-bottom: 0.25rem; }
        .mb-2 { margin-bottom: 0.5rem; }
        .mb-3 { margin-bottom: 0.75rem; }
        .mb-4 { margin-bottom: 1rem; }
        .mb-6 { margin-bottom: 1.5rem; }
        .mb-8 { margin-bottom: 2rem; }

        .mt-1 { margin-top: 0.25rem; }
        .mt-2 { margin-top: 0.5rem; }
        .mt-4 { margin-top: 1rem; }
        .mt-6 { margin-top: 1.5rem; }
        .mt-8 { margin-top: 2rem; }

        /* Específico para cada sección */
        
        /* Juegos */
        .juego-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 1.5rem;
        }

        .juego-card {
            background: white;
            border-radius: var(--radio);
            padding: 1.5rem;
            box-shadow: var(--sombra);
            text-align: center;
        }

        .tic-tac-toe-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 4px;
            max-width: 300px;
            margin: 1rem auto;
        }

        .tic-tac-toe-cell {
            width: 80px;
            height: 80px;
            background: var(--color-fondo);
            border: 2px solid var(--color-primario);
            font-size: 2rem;
            font-weight: bold;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 4px;
            transition: var(--transicion);
        }

        .tic-tac-toe-cell:hover {
            background: var(--color-primario);
            color: white;
        }

        .tic-tac-toe-cell.disabled {
            cursor: not-allowed;
            opacity: 0.7;
        }

        .memory-game-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 8px;
            max-width: 400px;
            margin: 1rem auto;
        }

        .memory-card {
            width: 80px;
            height: 80px;
            background: var(--color-primario);
            color: white;
            border: none;
            border-radius: 4px;
            font-size: 1.5rem;
            cursor: pointer;
            transition: var(--transicion);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .memory-card:hover {
            background: #4338CA;
        }

        .memory-card.flipped {
            background: var(--color-secundario);
        }

        .memory-card.matched {
            background: var(--color-exito);
            cursor: not-allowed;
        }

        /* Generador de stickers */
        .sticker-editor {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            max-width: 800px;
            margin: 0 auto;
        }

        .sticker-preview {
            text-align: center;
        }

        .sticker-canvas {
            border: 2px dashed var(--color-borde);
            border-radius: var(--radio);
            background: white;
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 400px;
            position: relative;
        }

        .sticker-controls {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        .file-input {
            display: none;
        }

        .file-label {
            display: block;
            padding: 1rem;
            border: 2px dashed var(--color-primario);
            border-radius: var(--radio);
            text-align: center;
            cursor: pointer;
            transition: var(--transicion);
        }

        .file-label:hover {
            background: rgba(79, 70, 229, 0.1);
        }

        .filter-buttons {
            display: flex;
            gap: 0.5rem;
            flex-wrap: wrap;
        }

        /* Calculadora de redes sociales */
        .social-calculator {
            max-width: 600px;
            margin: 0 auto;
        }

        .social-result {
            background: white;
            border-radius: var(--radio);
            padding: 2rem;
            box-shadow: var(--sombra);
            text-align: center;
        }

        .hours-chart {
            display: flex;
            align-items: end;
            justify-content: space-around;
            height: 200px;
            margin: 2rem 0;
            background: var(--color-fondo);
            border-radius: var(--radio);
            padding: 1rem;
        }

        .hour-bar {
            background: var(--color-primario);
            border-radius: 4px 4px 0 0;
            min-width: 40px;
            transition: var(--transicion);
            position: relative;
        }

        .hour-bar:hover {
            background: #4338CA;
        }

        .hour-label {
            position: absolute;
            bottom: -25px;
            left: 50%;
            transform: translateX(-50%);
            font-size: 0.75rem;
            color: var(--color-texto);
        }

        .hour-percentage {
            position: absolute;
            top: -25px;
            left: 50%;
            transform: translateX(-50%);
            font-size: 0.75rem;
            font-weight: 500;
            color: var(--color-primario);
        }

        /* Microlecciones */
        .lessons-container {
            max-width: 800px;
            margin: 0 auto;
        }

        .lesson-categories {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1rem;
            margin-bottom: 2rem;
        }

        .category-card {
            background: white;
            border-radius: var(--radio);
            padding: 1.5rem;
            box-shadow: var(--sombra);
            text-align: center;
            cursor: pointer;
            transition: var(--transicion);
        }

        .category-card:hover {
            box-shadow: var(--sombra-hover);
        }

        .lessons-list {
            background: white;
            border-radius: var(--radio);
            padding: 2rem;
            box-shadow: var(--sombra);
        }

        .lesson-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem;
            border-bottom: 1px solid var(--color-borde);
            transition: var(--transicion);
        }

        .lesson-item:hover {
            background: var(--color-fondo);
        }

        .lesson-item:last-child {
            border-bottom: none;
        }

        .progress-indicator {
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: var(--color-borde);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
        }

        .progress-indicator.completed {
            background: var(--color-exito);
        }

        .timer {
            font-size: 2rem;
            font-weight: bold;
            color: var(--color-primario);
            text-align: center;
            margin: 1rem 0;
        }

        /* Detector de fake news */
        .fake-news-analyzer {
            max-width: 600px;
            margin: 0 auto;
        }

        .url-form {
            background: white;
            border-radius: var(--radio);
            padding: 2rem;
            box-shadow: var(--sombra);
        }

        .analysis-result {
            background: white;
            border-radius: var(--radio);
            padding: 2rem;
            box-shadow: var(--sombra);
            margin-top: 2rem;
        }

        .credibility-score {
            text-align: center;
            margin: 2rem 0;
        }

        .score-circle {
            width: 120px;
            height: 120px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1rem;
            color: white;
            font-size: 2rem;
            font-weight: bold;
        }

        .score-low { background: var(--color-error); }
        .score-medium { background: var(--color-advertencia); }
        .score-high { background: var(--color-exito); }

        .analysis-indicators {
            margin: 2rem 0;
        }

        .indicator {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0.75rem;
            background: var(--color-fondo);
            border-radius: var(--radio);
            margin-bottom: 0.5rem;
        }

        .indicator-status {
            padding: 0.25rem 0.75rem;
            border-radius: 12px;
            font-size: 0.875rem;
            font-weight: 500;
        }

        .status-good { background: rgba(16, 185, 129, 0.1); color: var(--color-exito); }
        .status-warning { background: rgba(245, 158, 11, 0.1); color: var(--color-advertencia); }
        .status-bad { background: rgba(239, 68, 68, 0.1); color: var(--color-error); }

        .verification-sources {
            background: rgba(6, 182, 212, 0.1);
            border-radius: var(--radio);
            padding: 1rem;
            margin-top: 1rem;
        }

        .source-link {
            display: block;
            color: var(--color-secundario);
            text-decoration: none;
            margin: 0.5rem 0;
            font-weight: 500;
        }

        .source-link:hover {
            text-decoration: underline;
        }