:root {
            /* Paleta Dental Relajante (Soft Dental Palette) */
            --primary-blue: #2A64C4;
            /* Azul petróleo profundo (No lastima la vista) */
            --secondary-blue: #4a5568;
            /* Gris azulado para acentos */
            --soft-blue: #ebf8ff;
            /* Fondo muy suave para contraste */
            --accent-teal: #38b2ac;
            /* Verde azulado para elementos positivos */
            --text-main: #2d3748;
            /* Gris casi negro para lectura cómoda */
            --text-muted: #718096;
            /* Gris para descripciones */
            --white: #ffffff;
        }


        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        .container {
            font-family: 'Inter', sans-serif;
            background-color: var(--white);
            color: var(--text-main);
            line-height: 1.6;
            padding: 10px 20px;

            max-width: 1100px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 2.2fr 1fr;
            gap: 50px;
        }

        /* --- COLUMNA IZQUIERDA (CONTENIDO) --- */

        h1 {
            color: var(--primary-blue);
            font-size: 2.5rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 25px;
            letter-spacing: -0.02em;
        }

        .intro-text {
            font-size: 1.15rem;
            color: var(--text-muted);
            margin-bottom: 40px;
        }

        .intro-text span {
            color: var(--primary-blue);
            font-weight: 600;
        }

        /* Banner Estilo Tip (Inspirado en la imagen) */
        .hero-card {
            background: linear-gradient(135deg, #e2e8f0 0%, #edf2f7 100%);
            border-radius: 16px;
            padding: 40px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 50px;
            position: relative;
        }

        .hero-info {
            flex: 1;
        }

        .tip-label {
            color: var(--primary-blue);
            font-weight: 800;
            font-size: 0.85rem;
            letter-spacing: 1px;
            text-transform: uppercase;
            margin-bottom: 10px;
        }

        .hero-card h2 {
            font-size: 1.8rem;
            color: var(--text-main);
            margin-bottom: 20px;
            border: none;
        }

        .btn-cta {
            background-color: var(--primary-blue);
            color: white;
            padding: 12px 30px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            display: inline-block;
            transition: transform 0.2s;
        }

        .btn-cta:hover {
            cursor: pointer;
            background-color: var(--secondary-blue);
        }

        .hero-visual {
            flex: 0.8;
            text-align: right;
        }

        .hero-visual img {
            width: 100%;
            border-radius: 8px;
        }

        /* Estilo de Secciones */
        article h2 {
            color: var(--primary-blue);
            font-size: 1.6rem;
            margin: 40px 0 20px 0;
            display: flex;
            align-items: center;
        }

        .step-list {
            list-style: none;
        }

        .step-item {
            display: flex;
            gap: 15px;
            margin-bottom: 20px;
            padding: 15px;
            border-radius: 10px;
            transition: background 0.3s;
        }

        .step-item:hover {
            cursor: pointer;
            background-color: var(--soft-blue);
        }

        .step-number {
            background-color: var(--primary-blue);
            color: white;
            width: 32px;
            height: 32px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-weight: bold;
            font-size: 0.9rem;
        }

        /* --- COLUMNA DERECHA (SIDEBAR) --- */

        .sidebar-box {
            background-color: #f8fafc;
            border-radius: 12px;
            padding: 25px;
            position: sticky;
            top: 20px;
        }

        .sidebar-title {
            text-align: center;
            color: var(--primary-blue);
            font-weight: 800;
            font-size: 0.75rem;
            letter-spacing: 1.5px;
            text-transform: uppercase;
            padding-bottom: 15px;
            margin-bottom: 20px;
            border-bottom: 1px solid #e2e8f0;
        }

        .mini-guide {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 20px;
            text-decoration: none;
            color: inherit;
        }

        .mini-thumb {
            width: 70px;
            height: 45px;
            background-color: var(--secondary-blue);
            border-radius: 6px;
            flex-shrink: 0;
            background-size: cover;
            background-position: center;
        }

        .mini-text {
            font-size: 0.85rem;
            font-weight: 700;
            line-height: 1.3;
        }

        .cta-section {
            margin-top: 90px;
            padding: 0px 20px;
            text-align: center;
            background-color: #ffffff;
        }

        .cta-section h2 {
            font-size: 1.9rem;
            font-weight: 800;
            color: var(--primary-blue);
            margin-bottom: 15px;
        }

        .cta-section p {
            max-width: 620px;
            margin: 0 auto 35px auto;
            color: var(--text-muted);
            font-size: 1rem;
            line-height: 1.6;
        }

        .cta-buttons {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
        }

        /* Botón Comprar (outline) */
        .btn-outline {
            padding: 12px 30px;
            border-radius: 6px;
            border: 1.5px solid var(--secondary-blue);
            color: var(--secondary-blue);
            text-decoration: none;
            font-weight: 600;
            transition: all 0.2s ease;
        }

        .btn-outline:hover {
            cursor: pointer;
            background-color: #eff6ff;
        }

        /* Botón Descargar */
        .btn-primary {
            padding: 12px 30px;
            border-radius: 6px;
            background-color: var(--primary-blue);
            color: white;
            text-decoration: none;
            font-weight: 600;
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }

        .btn-primary:hover {
            cursor: pointer;
            box-shadow: 0 8px 20px rgba(59, 130, 246, 0.25);
        }



        footer {
            margin-top: 80px;
            padding-top: 40px;
            border-top: 1px solid #e2e8f0;
            text-align: center;
            color: var(--text-muted);
            font-size: 0.9rem;
        }

        @media (max-width: 850px) {
            .container {
                grid-template-columns: 1fr;
            }

            .hero-card {
                flex-direction: column;
                text-align: center;
            }

            .hero-visual {
                margin-top: 20px;
            }
        }

        .resources-section {
            padding: 90px 20px;
            background-color: #ffffff;
        }

        .resources-header {
            text-align: center;
            max-width: 700px;
            margin: 0 auto 60px auto;
        }

        .resources-header h2 {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary-blue);
            margin-bottom: 15px;
        }

        .resources-header p {
            color: var(--text-muted);
            font-size: 1rem;
            line-height: 1.6;
        }

        .resources-grid {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        /* Tarjetas */
        .resource-card {
            border-radius: 16px;
            overflow: hidden;
            background-color: #ffffff;
            border: 1px solid #e5e7eb;
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }

        .resource-card:hover {
            cursor: pointer;
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.08);
        }

        /* Imagen superior */
        .resource-image {
            height: 170px;
            position: relative;
            padding: 20px;
        }

        /* Colores de fondo */
        .bg-orange {
            background-color: #fdc88a;
        }

        .bg-dark {
            background-color: #2f2a6b;
        }

        .bg-purple {
            background-color: #7c74f2;
        }

        /* Badge */
        .resource-badge {
            position: absolute;
            bottom: 15px;
            left: 20px;
            font-size: 0.7rem;
            font-weight: 700;
            letter-spacing: 1px;
            color: #ffffff;
            opacity: 0.9;
        }

        /* Icono */
        .resource-icon {
            position: absolute;
            bottom: 15px;
            right: 20px;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background-color: rgba(255, 255, 255, 0.9);
            color: #2d3748;
            font-size: 0.7rem;
            font-weight: 800;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        /* Contenido */
        .resource-content {
            padding: 25px;
        }

        .resource-content h3 {
            font-size: 1.05rem;
            font-weight: 800;
            margin-bottom: 10px;
            color: var(--text-main);
        }

        .resource-content p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* Responsive */
        @media (max-width: 900px) {
            .resources-grid {
                grid-template-columns: 1fr;
            }
        }