body {
      background-color: #f9f9f9;
      font-family: 'Helvetica Neue', sans-serif;
      color: #333;
    }
    h2 {
      font-weight: 700;
      margin-bottom: 20px;
    }

        .head_exp{
    top:0;
    background-color: #ed1c24;
    padding: 0.5em;
    position: fixed;
    display: block;
    width: 100%;
    border-bottom-color: #000;
    border-right-width: 2px;
    border-bottom-style:solid;
    z-index: 99;
    -webkit-transition: background-color 0.5s ease-out; -moz-transition: 
  background-color 0.5s ease-out; -o-transition: background-color 0.5s ease-out; transition: background-color 0.5s ease-out;
}
.head_exp:hover{
    background-color: rgb(0, 0, 0);
}
    /* Intro con imagen de fondo */
    .intro {
      position: relative;
      text-align: center;
      position: relative;
      min-height: 92vh;
      color: #fff;
      text-align: center;
      padding: 80px 20px;
      padding-top: 25%;
      color: #fff;
      background-image: url('../img/portada-nestle.jpg'); /* Reemplaza con tu imagen */
      background-size: cover;
      background-position: center;
    }
    .intro::before {
      content: "";
      position: absolute;
      top: 0; left: 0;
      width: 100%; height: 100%;
      background: rgba(0,0,0,0.5); /* Overlay oscuro para contraste */
      z-index: 0;
    }
    .intro h1, .intro p {
      position: relative;
      z-index: 1;
    }
    .block {
      padding: 60px 20px;
    }
    .flip-card {
      background-color: transparent;
      width: 100%;
      height: 250px;
      perspective: 1000px;
      margin-bottom: 30px;
    }
    .flip-card-inner {
      position: relative;
      width: 100%;
      height: 100%;
      text-align: center;
      transition: transform 0.8s;
      transform-style: preserve-3d;
    }
    .flip-card:hover .flip-card-inner {
      transform: rotateY(180deg);
    }
    .flip-card-front, .flip-card-back {
      position: absolute;
      width: 100%;
      height: 100%;
      backface-visibility: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 20px;
      border-radius: 10px;
      box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    }
    .flip-card-front {
      background: radial-gradient(circle, #4a8681, #0e0d0d);
      color: #ffffff;
      font-weight: bold;
    }
    .flip-card-back {
      background: radial-gradient(circle, #1b1b1b, #000000);
      color: #ffffff;
      transform: rotateY(180deg);
    }
    .cta-btn {
      display: block;
      margin: 40px auto;
      padding: 15px 30px;
      font-size: 18px;
      font-weight: bold;
      background-color: #0e0d0d;
      border: 1px solid #fff;
      border-radius: 30px;
      transition: background-color 0.3s;
    }
    .cta-btn:hover {
      background-color: #ffffff;
      color: #fff;
    }
    .img-block {
      max-width: 100%;
      border-radius: 10px;
      margin-bottom: 20px;
    }
    a {
      color: #ffffff;
      text-decoration: none;
    }
    a:hover {
      color: #1b1b1b;
    }