Animate a div from bottom to top with css

I need to animate a div going from bottom to top. This is the situation: I have a thumbnail that includes the title and description of a movie inside of it. I want to hide the description and only show it when the user hovers the mouse on it.

I tried resizing the height of the container but you can't animate it when the value is set to "auto", and i can't provide an specific size for it because the title may vary for each movie. And as a lot of you may know, you can't animate from bottom to top using the "bottom" and "top" properties.

This is the html:

<div class="thumbnail-component">
  <img class="thumbnail-component__background" src="background.jpg" alt="">
  <div class="thumbnail-component__gradient"></div>
  <div class="text">

    <div class="text__content">
        <p class="text__title">The movie title</p>
        <div class="text__separator"></div>
        <p class="text__description">
            Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
        </p>
        <p class="text__author">Published by Author</p>
    </div>
</div>

And here is an image of what i'm trying to accomplish:

I'm honestly completely lost, i think i tried everything i know. Sorry for my not too great english.

Show Card description on Card hover

Completely flexible and responsive
No hard-coded or arbitrary heights, no JS involved.

On hover show card description using CSS

Basically,

translateY the title to -100%, on hover animate to 0
Wrap both title and content into a DIV (i.e: .anim)
translateY .anim to +100%, and on hover animate it to 0

Open the example in full page to see what happens and how it works:

/*QuickReset*/*{margin:0;box-sizing:border-box;}

.thumb {
  width: 140px;
  background: #eee;
}

.anim {
  transition: 0.5s;
  transform: translateY(100%);
}

.title {
  color: red;
  transition: 0.5s;
  transform: translateY(-100%);
}

.author {
  color: blue;
}

/* ANIMATE */

.thumb:hover .anim,
.thumb:hover .title {
  transform: translateY(0);
}

<div class="thumb">
  <div class="anim">
    <div class="title">The movie even longer title</div>
    <div class="description">
      Text lenghts of Title and Author or even Description do not matter. They will all perfectly accommodate into .thumb on hover
    </div>
  </div>
  <div class="author">Published by super long some Author</div>
</div>

Flexbox Grid!

The real-case proof of concept example:

/*QuickReset*/

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

html {
  height: 100%
}

body {
  min-height: 100%;
  font: 14px/1.4 sans-serif;
}

.grid-3 {
  display: flex;
  flex-flow: row wrap;
}

.thumb {
  display: flex;
  flex-flow: column nowrap;
  position: relative;
  overflow: hidden;
  width: 33.333%;
  color: #fff;
}

.thumb-gradient,
.thumb-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.thumb-gradient {
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0.24) 0%, rgba(0, 0, 0, 0.56) 100%);
}

.thumb-anim {
  margin-top: auto;  /* pushes all content to bottom */
  position: relative;
  transition: 0.5s;
  transform: translateY(100%);
}

.thumb-title {
  text-transform: uppercase;
  padding: 20px;
  transition: 0.5s;
  transform: translateY(-100%);
}

.thumb-description {
  padding: 10px 20px;
  transition: 0.5s;
  opacity: 0;
  flex: 1;
}

.thumb-author {
  padding: 20px;
  position: relative;
}


/* ANIMATE */

.thumb:hover .thumb-anim {
  transform: translateY(0);
}

.thumb:hover .thumb-title {
  transform: translateY(0%);
}

.thumb:hover .thumb-description {
  opacity: 1;
}

<div class="grid-3">

  <div class="thumb">
    <img class="thumb-img" src="http://placekitten.com/300/300" alt="Catz!">
    <div class="thumb-gradient"></div>
    <div class="thumb-anim">
      <h3 class="thumb-title">The movie title</h3>
      <p class="thumb-description">
        Text lenghts of Title and Author or even Description do not matter. They will all perfectly accommodate into .thumb on hover
      </p>
    </div>
    <div class="thumb-author">Published by super long some Author</div>
  </div>

  <div class="thumb">
    <img class="thumb-img" src="http://placekitten.com/400/300" alt="Catz!">
    <div class="thumb-gradient"></div>
    <div class="thumb-anim">
      <h3 class="thumb-title">The movie title</h3>
      <p class="thumb-description">
        The row heights are dictated by the tallest in the horizontal group
      </p>
    </div>
    <div class="thumb-author">Published</div>
  </div>

  <div class="thumb">
    <img class="thumb-img" src="http://placekitten.com/230/300" alt="Catz!">
    <div class="thumb-gradient"></div>
    <div class="thumb-anim">
      <h3 class="thumb-title">The movie title a super long title here</h3>
      <p class="thumb-description">
        Lorem ipsum dolor sit amet, consectetur adipisicing elit. Repellendus facilis beatae, numquam aliquam eveniet. Iure porro provident itaque hic quae tempora. Quaerat doloribus dolore facilis similique, soluta asperiores quas sapiente.
      </p>
    </div>
    <div class="thumb-author">Published by super long some Author</div>
  </div>

  <div class="thumb">
    <img class="thumb-img" src="http://placekitten.com/270/300" alt="Catz!">
    <div class="thumb-gradient"></div>
    <div class="thumb-anim">
      <h3 class="thumb-title">The movie title</h3>
      <p class="thumb-description">
        Text lenghts of Title and Author or even Description do not matter. They will all perfectly accommodate into .thumb on hover
      </p>
    </div>
    <div class="thumb-author">Published by super long some Author</div>
  </div>

  <div class="thumb">
    <img class="thumb-img" src="http://placekitten.com/250/370" alt="Catz!">
    <div class="thumb-gradient"></div>
    <div class="thumb-anim">
      <h3 class="thumb-title">The movie title</h3>
      <p class="thumb-description">
        Text lenghts of Title and Author or even Description do not matter. They will all perfectly accommodate into .thumb on hover
      </p>
    </div>
    <div class="thumb-author">Yep. Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cupiditate sequi aspernatur cumque saepe incidunt enim, nihil dolores ipsam numquam architecto velit labore quod laboriosam aliquam distinctio tempora unde ad totam.</div>
  </div>

  <div class="thumb">
    <img class="thumb-img" src="http://placekitten.com/290/340" alt="Catz!">
    <div class="thumb-gradient"></div>
    <div class="thumb-anim">
      <h3 class="thumb-title">The movie title</h3>
      <p class="thumb-description">
        Text lenghts of Title and Author or even Description do not matter. They will all perfectly accommodate into .thumb on hover
      </p>
    </div>
    <div class="thumb-author">Published by super long some Author</div>
  </div>

</div>

Animate a div from bottom to top with css

Show Card description on Card hover

Flexbox Grid!

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