html {
  scroll-behavior: smooth;
  -webkit-scroll-behavior: smooth;
}

/* увеличение кнопок при наведении. */
header {
  a {
    -webkit-transition: all 0.25s ease-in;
    -moz-transition: all 0.25s ease-in;
    -o-transition: all 0.25s ease-in;
    transition: all 0.25s ease-in;
  }
}

.navigation-desktop {
  a:hover {
    margin: 0 1em 0;
    padding: 4px 10px;
    -webkit-transform: scale(1.2);
    -moz-transform: scale(1.2);
    -ms-transform: scale(1.2);
    -o-transform: scale(1.2);
    transform: scale(1.2);
    -webkit-animation: animation_RGB 5s ease infinite;
    -moz-animation: animation_RGB 5s ease infinite;
    -o-animation: animation_RGB 5s ease infinite;
    animation: animation_RGB 5s ease infinite;
    border: 1.5px solid #ffffff;
    font-weight: bold;
    border-radius: 20px;
    color: #ffffff;
  }
}

/* анимация для слова фронтенд */
#frontend_is {
  h3 {
    border-radius: 1em;
    padding: 0.1em 0.2em;
    -webkit-transition: all 0.25s ease-in;
    -moz-transition: all 0.25s ease-in;
    -o-transition: all 0.25s ease-in;
    transition: all 0.25s ease-in;
    -webkit-animation: animation_RGB 5s ease infinite;
    -moz-animation: animation_RGB 5s ease infinite;
    -o-animation: animation_RGB 5s ease infinite;
    animation: animation_RGB 5s ease infinite;
  }

  h3:hover {
    padding: 0 0.3em;
    font-size: 1.5em;
  }
}

/* радужная анимация */
@-webkit-keyframes animation_RGB {
  0% { background: none; }
  10% { background-color: #c21414; color: #ffffff; }
  30% { background-color: #cfc20d; color: #000; }
  50% { background-color: #3dc214; color: #000; }
  60% { background-color: #146ec2; color: #ffffff; }
  80% { background-color: #6e14c2; color: #ffffff; }
  100% { background-color: #c21497; }
}
@-moz-keyframes animation_RGB {
  0% { background: none; }
  10% { background-color: #c21414; color: #ffffff; }
  30% { background-color: #cfc20d; color: #000; }
  50% { background-color: #3dc214; color: #000; }
  60% { background-color: #146ec2; color: #ffffff; }
  80% { background-color: #6e14c2; color: #ffffff; }
  100% { background-color: #c21497; }
}
@-o-keyframes animation_RGB {
  0% { background: none; }
  10% { background-color: #c21414; color: #ffffff; }
  30% { background-color: #cfc20d; color: #000; }
  50% { background-color: #3dc214; color: #000; }
  60% { background-color: #146ec2; color: #ffffff; }
  80% { background-color: #6e14c2; color: #ffffff; }
  100% { background-color: #c21497; }
}
@keyframes animation_RGB {
  0% { background: none; }
  10% { background-color: #c21414; color: #ffffff; }
  30% { background-color: #cfc20d; color: #000; }
  50% { background-color: #3dc214; color: #000; }
  60% { background-color: #146ec2; color: #ffffff; }
  80% { background-color: #6e14c2; color: #ffffff; }
  100% { background-color: #c21497; }
}

/* зеленая анимация рамки */
@-webkit-keyframes border_RGB {
  0% { border: 1px solid #000000; }
  70% { border: 1px solid #ffffff; }
  90% { border: 1px solid #1eff00; }
  100% { border: 1px solid #273a1b; }
}
@-moz-keyframes border_RGB {
  0% { border: 1px solid #000000; }
  70% { border: 1px solid #ffffff; }
  90% { border: 1px solid #1eff00; }
  100% { border: 1px solid #273a1b; }
}
@-o-keyframes border_RGB {
  0% { border: 1px solid #000000; }
  70% { border: 1px solid #ffffff; }
  90% { border: 1px solid #1eff00; }
  100% { border: 1px solid #273a1b; }
}
@keyframes border_RGB {
  0% { border: 1px solid #000000; }
  70% { border: 1px solid #ffffff; }
  90% { border: 1px solid #1eff00; }
  100% { border: 1px solid #273a1b; }
}

@-webkit-keyframes opticy {
  0% { opacity: 0%; }
  100% { opacity: 100%; }
}
@-moz-keyframes opticy {
  0% { opacity: 0%; }
  100% { opacity: 100%; }
}
@-o-keyframes opticy {
  0% { opacity: 0%; }
  100% { opacity: 100%; }
}
@keyframes opticy {
  0% { opacity: 0%; }
  100% { opacity: 100%; }
}

/* добавление анимации рамок для направлений во фронтенде */
#direction {
  #article-1 {
    -webkit-animation: border_RGB 5s ease infinite;
    -moz-animation: border_RGB 5s ease infinite;
    -o-animation: border_RGB 5s ease infinite;
    animation: border_RGB 5s ease infinite;
  }
  #article-2 {
    -webkit-animation: border_RGB 5.1s ease infinite;
    -moz-animation: border_RGB 5.1s ease infinite;
    -o-animation: border_RGB 5.1s ease infinite;
    animation: border_RGB 5.1s ease infinite;
  }
  #article-3 {
    -webkit-animation: border_RGB 5.2s ease infinite;
    -moz-animation: border_RGB 5.2s ease infinite;
    -o-animation: border_RGB 5.2s ease infinite;
    animation: border_RGB 5.2s ease infinite;
  }
  #article-4 {
    -webkit-animation: border_RGB 5.3s ease infinite;
    -moz-animation: border_RGB 5.3s ease infinite;
    -o-animation: border_RGB 5.3s ease infinite;
    animation: border_RGB 5.3s ease infinite;
  }

  /* анимация при наведении */
  p {
    -webkit-transition: all 0.25s ease-in;
    -moz-transition: all 0.25s ease-in;
    -o-transition: all 0.25s ease-in;
    transition: all 0.25s ease-in;
  }
  p:hover {
    margin: 1em;
    padding: 0.1em 0.5em;
    -webkit-transform: scale(1.1);
    -moz-transform: scale(1.1);
    -ms-transform: scale(1.1);
    -o-transform: scale(1.1);
    transform: scale(1.1);
  }
}

.testimonials .btn:hover {
  background-color: #ffffff;
  -webkit-tap-highlight-color: rgba(0,0,0,0.1); /* Подсветка при тапе (для мобильных) */
  touch-action: manipulation; /* Оптимизация для тач-устройств */
  cursor: pointer;
  -webkit-transform: scale(1.2);
  -moz-transform: scale(1.2);
  -ms-transform: scale(1.2);
  -o-transform: scale(1.2);
  transform: scale(1.2);
  font-size: x-large;
}

/* адаптация под разные экраны */
@media (min-width: 431px) {
  .navigation-mobile {
    display: none;
  }
}

@media (max-width: 430px) {
  .navigation-desktop {
    display: none;
  }

  .navigation-mobile {
    button div {
      display: none;
    }
    button:focus {
      opacity: 100%;
      div {
        display: block;
        -webkit-animation: opticy 1s ease-out 1;
        -moz-animation: opticy 1s ease-out 1;
        -o-animation: opticy 1s ease-out 1;
        animation: opticy 1s ease-out 1;
      }
    }
    a:hover {
      background-color: #6ec201;
      color: #000;
    }
  }

  #img_header {
    margin: 5px;
    display: -webkit-grid;
    display: -moz-grid;
    display: grid;
    -webkit-grid-template-columns: 2fr 1fr;
    -moz-grid-template-columns: 2fr 1fr;
    grid-template-columns: 2fr 1fr;
    -webkit-align-items: end;
    -moz-align-items: end;
    align-items: end;
  }

  #img_header img {
    max-width: 100%;
    height: auto;
  }

  #chtotividish {
    width: auto;
    margin: 0;
  }

  #v_internete {
    margin: 0;
    width: auto;
  }

  #frontend_is {
    border: 1px solid #c0c2cc;
    border-radius: 2em;
    padding: 1em;
    margin: 4em 1em 1em;
  }

  #frontend_is h3,
  #frontend_is p {
    font-size: 80%;
    display: inline;
  }

  #frontend_is h3:hover {
    padding: 0 0.3em;
    font-size: 100%;
  }

  .direction {
    font-size: large;
  }

  .container-direction {
    background-color: #3a3d42;
    border-radius: 1rem;
    padding: 0;
  }

  #direction {
    display: -webkit-grid;
    display: -moz-grid;
    display: grid;
    -webkit-grid-template-columns: repeat(4, 60%);
    -moz-grid-template-columns: repeat(4, 60%);
    grid-template-columns: repeat(4, 60%);
    margin: 0;
  }

  .scroller-direction {
    padding: 1em;
    display: -webkit-box;
    display: -moz-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    overflow: hidden;
    overflow-x: scroll;
    -webkit-scroll-snap-type: x mandatory;
    -moz-scroll-snap-type: x mandatory;
    scroll-snap-type: x mandatory;
  }

  article {
    font-size: 80%;
    scroll-snap-align: center;
  }

  .eyes {
    -webkit-scale: 0.5;
    -moz-scale: 0.5;
    scale: 0.5;
    margin: 0 0 5em;
  }

  #where_to_work {
    font-size: large;
  }
  
  .where_to_work {
    .where_to_work-p {
      margin: -1em 0 1.5em;
      font-size: 70%;
    }
  }

  .testimonials {
    font-size: 80%;
    min-width: 100%;
  }

  .testimonials .btn {
    width: 10px;
    height: 10px;

  .personality-container {
    font-size: 50%;
    display: -webkit-grid;
    display: -moz-grid;
    display: grid;
    -webkit-grid-template-columns: 1fr;
    -moz-grid-template-columns: 1fr;
    grid-template-columns: 1fr;
    -webkit-grid-template-rows: auto;
    -moz-grid-template-rows: auto;
    grid-template-rows: auto;
  }
}