body {
      font-family: "Montserrat", sans-serif;
      font-optical-sizing: auto;
      font-style: normal;
      font-weight: 400;

      color: #fff;
      margin: 0;
      min-height: 100vh;

      flex-direction: column;
      justify-content: center;
      align-items: center;
      text-align: center;

    }

    h1 {
      margin-top: 40px;
      margin-bottom: 10px;
      font-size: 2.5rem;
      color: #8F97A0;

    }

    #gauge {
  position: relative;
  width: 500px;
  height: 300px;
  margin: 30px auto;
  overflow: hidden;

  /* Стартовое состояние: сжат и прозрачный */
  /* opacity: 0;
  transform: scaleY(0); */
  transform-origin: top;
  transition: transform 0.5s cubic-bezier(0.075, 0.82, 0.165, 1),
              opacity 0.5s cubic-bezier(0.075, 0.82, 0.165, 1);
}

/* Плавное разворачивание контейнера */
#gauge.show {
  opacity: 1;
  transform: scaleY(1);
}

/* Заглушка (gif) */
#gauge::before {
  content: "";
  position: absolute;
  inset: 0;
  /* background: url("https://arriva.net.ru/static/images/website/Sinusoid_in_space.gif") center center no-repeat; */
  background-size: 80%;
  opacity: 1;
  transition: opacity 0.4s ease;
  /* z-index: 2; */
}

/* Когда заглушку надо убрать */
#gauge.content-ready::before {
  opacity: 0;
  pointer-events: none;
}

/* Контент внутри gauge */
#gauge > .content {
  opacity: 0;
  transition: opacity 0.4s ease;
  position: relative;
  z-index: 1;
}

#gauge.content-ready > .content {
  opacity: 1;
}



    #speedValue {
      font-size: 2.2rem;
      margin: 20px 0;

      color: #8F97A0;
      transform: scale(1);
      transition: transform 0.3s ease-in-out;
    }
    #speedValue:hover {
      transform: scale(1.1);
    }   
  

    #startBtn {
      padding: 14px 30px;
      font-size: 1.2rem;
      font-weight: bold;
      cursor: pointer;
      border: none;
      border-radius: 8px;
      background: #111D2A;
      color: #8F97A0;
      transition: all 0.3s;

    }

    #startBtn:hover:not(:disabled) {
      background: #4A423F;
      transform: translateY(-2px);
    }

    #startBtn:disabled {
      background: #8F97A0;
      color: #8F97A0;
      cursor: not-allowed;
      transform: none;
      box-shadow: none;
    }

    .div_contacts {
      margin-top: 140px;
    }

    .div_address h3 {
      color: #4A423F;
    }

    #div_3check_wrap {
      cursor: pointer;
    }

    @media (max-width: 1100px) {
      #gauge {
        width: 300px;
        height: 200px;
        margin: 20px auto;
      }
    }