* {
            margin: 0;
            padding: 0;
        }
        :root {
            --primary-color: #ff0000;
            --secondary-color: #28a745;
            --dark-color: #1b1e21;
            --light-color: #f8f9fa;
            --gray-color: #6c757d;
        }

        body {
            font-family: 'Roboto', sans-serif;
            margin: 0;
            padding: 0px;
            box-sizing: border-box;
            background-color: var(--light-color);
            color: var(--dark-color);
            line-height: 1.6;
        }

        .container {
            max-width: 1200px;
            margin: auto;
            overflow: hidden;
            padding: 0 8vh;
        }

        /* Encabezado y Navegación */
        .header-main {
            background-color: #000000;
            color: var(--light-color);
            padding: 1rem 0;
            border-bottom: 3px solid var(--primary-color);
        }

        .header-main .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            font-size: 2rem;
            font-weight: 700;
            color: var(--primary-color);
            text-decoration: none;
        }

        .nav ul {
            list-style: none;
            display: flex;
            margin: 0;
            padding: 0;
        }

        .nav ul li {
            margin-left: 20px;
        }

        .nav ul li a {
            color: var(--light-color);
            text-decoration: none;
            font-weight: 400;
            padding: 5px 10px;
            transition: color 0.3s ease;
        }

        .nav ul li a:hover {
            color: var(--primary-color);
        }

        /* Sección de Calidad */
        .calidad-hero {
            background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('https://via.placeholder.com/1920x600/007BFF/FFFFFF?text=Materiales+de+Calidad') no-repeat center center/cover;
            color: var(--light-color);
            padding: 6rem 0;
            text-align: center;
        }

        .calidad-hero h1 {
            font-size: 4rem;
            margin-bottom: 1rem;
        }
        .calidad-container{
            background-color: black;
            position: relative;
            color: var(--light-color);
            margin-bottom: 10px;
            text-align: center;
            height: 55vh;

            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            align-items: center;
        }

        .calidad-container .background {
            width: 100%;
            height: 100%;
            background-image: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5)), url('img/FONDO\ PRO.png');
            background-position: center;
            background-repeat: no-repeat;
            background-size: cover;
            filter: blur(3px) brightness(45%);
        }

        .calidad-container .container {
            position: absolute;

            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            align-items: center;
        }

        .calidad-container .container p, h1 {
            text-shadow: 0px 0px 30px #000000;
        }

        .calidad-container .container p {
            text-align: justify;
            font-weight: bolder;
            width: 50%;
        }

        .calidad-container .container h1 {
            width: 100%;
            margin-bottom: 10px;
            text-transform: uppercase;

            color: #f11d1d;
        }

        .calidad-hero p {
            font-size: 1.5rem;
            max-width: 800px;
            margin: auto;
        }

        .seccion-iconos {
            padding: 4rem 0;
            text-align: center;
        }

        .seccion-iconos h2 {
            font-size: 2.5rem;
            margin-bottom: 3rem;
            color: var(--dark-color);
        }

        .iconos-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
        }

        .icono-item {
            background: #fff;
            padding: 2rem;
            border-radius: 8px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .icono-item:hover {
            transform: translateY(-10px);
            box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
        }

        .icono-item i {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }

        .icono-item h3 {
            font-size: 1.5rem;
            margin-bottom: 0.5rem;
            color: var(--dark-color);
        }

        .icono-item p {
            color: var(--gray-color);
        }

        .llamada-a-la-accion {
            background-color: var(--primary-color);
            color: var(--light-color);
            text-align: center;
            padding: 4rem 0;
        }

        .llamada-a-la-accion h2 {
            font-size: 2.5rem;
            margin-bottom: 1rem;
        }

        .llamada-a-la-accion p {
            font-size: 1.2rem;
            margin-bottom: 2rem;
        }

        .llamada-a-la-accion a {
            background: var(--secondary-color);
            color: var(--light-color);
            text-decoration: none;
            padding: 1rem 2rem;
            border-radius: 50px;
            font-size: 1.2rem;
            font-weight: 700;
            transition: background-color 0.3s ease;
        }

        .llamada-a-la-accion a:hover {
            background-color: #218838;
        }
        
        /* Pie de página */
        .footer {
            background-color: black;
            color: var(--light-color);
            padding: 2rem 0;
            text-align: center;
        }

        .footer p {
            margin: 0;
        }

        /* Botón de WhatsApp */
        .whatsapp-button {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background-color: var(--secondary-color );
            color: var(--light-color);
            border-radius: 50%;
            width: 60px;
            height: 60px;
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 2rem;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
            z-index: 1000;
            transition: transform 0.3s ease;
        }

        /* Header responsive (hamburger menu) */
        .nav-toggle { display: none; background: transparent; border: 0; color: var(--light-color); font-size: 1.25rem; padding:8px; cursor:pointer }
        @media (max-width: 900px) {
            .nav-toggle { display: inline-flex; }
            .nav { position: fixed; top: 0; right: 0; height: 100%; width: 80%; max-width: 320px; background: #000; transform: translateX(100%); transition: transform .22s ease; padding: 2.25rem 1rem; z-index: 9999; }
            .nav.open { transform: translateX(0); }
            .nav ul { display:flex; flex-direction:column; gap:1rem; }
            .nav ul li { margin-left: 0 }
        }
   
            
        /* Contact + footer */
    .contacts{display:grid;grid-template-columns:1fr 240px;gap:20px;align-items:start}
    footer{padding:24px 0;color:var(--muted);font-size:14px}

        .whatsapp-button:hover {
            transform: scale(1.1);
        }
        







         body {
      font-family: Arial, sans-serif;
      background-color: #f4f4f4;
      margin: 0;
      padding: 0px;
    }

    h1 {
      text-align: center;
      margin-bottom: 30px;
    }

    .video-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 20px;
    }

    .video-item {
      background-color: white;
      padding: 10px;
      border-radius: 8px;
      box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    }

    iframe {
      width: 100%;
      height: 180px;
      border: none;
      border-radius: 4px;
    }

    .video-title {
      margin-top: 10px;
      font-size: 16px;
      font-weight: bold;
      color: #333;
    }