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

:root {
  font-family: var(--main-font);
  background: var(--background-color);
  color: var(--title-color-primary);
  --main-font: monospace;
  --footer-height: 71px;
  --background-color: #1c1713;
  --links-color-primary: #e1ffe6;
  --links-color-secondary: #e67606;
  --title-color-primary: #e1ffe6;
  --header-background-color: #039ae3;
  --footer-background-color: #039ae3;
  --card-hover-focus-bg-color: #303030;
}

html {
  height: 100%;
}

body {
  min-height: 100%;
}

/* Links */

a {
  text-decoration: none;
}

.content-paragraph a {
  color: var(--header-background-color);
}

/* Header */

.header {
  display: flex;
  padding: 2rem 2rem;
  background: var(--header-background-color);
  height: fit-content;
}

.header__title, .header__subtitle {
  text-align: center;
  margin: auto;
  width: 30%;
  color: var(--title-color-primary);
}

.header__subtitle {
  text-transform: uppercase;
}

.header__links {
  display: flex;
  margin: auto;
  text-align: center;
  width: 30%;
}

.header__links img {
  width: 25px;
  height: 25px;
}

.header__links a:hover {
  background-color: hsla(0, 0%, 100%, 0.6);
}

.resume {
  display: flex;
  margin-top: 1rem;
}

.resume a {
  display: flex;
  align-items: center;
  max-width: 50%;
}

.resume a:hover {
  font-weight: bolder;
  letter-spacing: 2px;
}

.resume a p {
  color: var(--title-color-primary);
  font-size: 14px;
  padding: 10px;
}

/* Content  */

.card {
  border: solid 1px white;
  margin: 1rem auto;
  width: 50%;
}

.card__title {
  cursor: pointer;
  padding: 1rem;
  color: var(--title-color-primary);
}

.card__paragraph {
  text-align: left;
  margin-top: 0.5rem;
  color: black;
  padding: 0 1rem 1rem;
}

.card:hover, .card:focus {
  background-color: var(--card-hover-focus-bg-color);
}

.container {
  margin: 1rem auto;
  display: flex;
  flex-direction: column;
  padding: 0 1rem;
}

.content-container {
  margin: 5rem auto;
  text-align: center;
  max-width: 600px;
}

.image-container {
  --image-container-width: 350px;
  width: var(--image-container-width);
  height: calc(1.2 * var(--image-container-width));
  display: flex;
  flex-direction: column;
  background-color: white;
  padding: 1rem;
  rotate: 15deg;
}

.image {
  width: 100%;
}

.image > img {
  border: 1px solid #838080;
  width: 100%;
}

.img-copyright {
  font-size: 12px;
  color: black;
  padding: 0 1rem;
}

.img-copyright a {
  color: var(--links-color-secondary);
}

.intro-paragraph {
  color: var(--title-color-primary);
  margin: 5rem 0 1rem 0;
}

.logos-box {
  display: flex;
  margin: 1rem auto var(--footer-height) auto;
  flex-wrap: wrap;
  gap: 2.5rem;
}

.logos-box img {
  height: 25px;
}

.logos-box a {
  height: 25px;
}

.logos-box a:hover {
  background: var(--background-color);
  box-shadow: 1px 1px 20px white;
}

/* Collapsible */
.collapsible {
  background-color: var(--background-color);
  color: var(--title-color-primary);
  cursor: pointer;
  padding: 1rem;
  margin: 1rem auto;
  width: 100%;
  border: 1px white solid;
  text-align: center;
  outline: none;
}

.active, .focus, .collapsible:hover {
  background-color: var(--card-hover-focus-bg-color);
}

.collapsible::after {
  content: '\00ff0b';
  font-size: 13px;
  color: var(--title-color-primary);
  float: right;
  margin-left: 5px;
}

.active::after {
  content: '\00FF0D'
}

.coll-content {
  padding: 0 1rem;
  text-align: left;
  overflow: hidden;
  background-color: white;
  max-height: 0;
  transition: max-height 0.2s ease-out;
}

.content-title {
  color: var(--background-color);
  margin-top: 0.5rem;
}

.content-paragraph {
  margin: 1rem 0;
  color: var(--background-color);
}

.project-image {
  margin: 1rem 0;
  
}

.project-image img {
  margin: 0 auto;
  display: block;
  width: 230px;
  height: 264px;
}

/* Footer */

.footer {
  text-align: center;
  margin: 0 auto;
  /* width: 100vw; */
  height: var(--footer-height);
  background: var(--footer-background-color);
  padding: 1rem;
  color: var(--title-color-primary);
  /*position: fixed;*/
  /*bottom: 0;*/
}

.footer-elements div {
  margin-bottom: 0.5rem;
}

/* desktop */
@media screen and (min-width: 1024px) {
  body {
  font-size: 18px;
 }

 h1.header__title {
  font-size: 25px;
 }

  .intro-paragraph {
  font-size: 24px;
 }

  .content-paragraph {
  font-size: 16px;
  }

  .footer-elements {
    font-size: 12px;
  }
}

/* tablet */
@media screen and (min-width: 768px) and (max-width: 1023px) {
  body {
    font-size: 16px;
  }

  h1.header__title {
    font-size: 23px;
  }

  .intro-paragraph {
    font-size: 22px;
  }

  .content-paragraph {
    font-size: 14px;
  }

  .footer-elements {
    font-size: 10px;
  }
}

/* smartphone  */
@media screen and (max-width: 767px) {
  body {
    font-size: 14px;
  }

  h1.header__title {
    font-size: 16px;
  }

  .header {
    padding: 0.5rem;
  }

  .header__links {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
  }

  .header__links a {
    margin: 0.8rem;
    padding: 0.1rem 0.2rem;
    
  }

  .header__links img {
    height: 20px;
    width: 20px;
  }

  .intro-paragraph {
    font-size: 20px;
    margin: 2.5rem 0 0.5rem 0;
  }

  .content-container {
    margin: 2rem auto;
  }

  .content-paragraph {
    font-size: 12px;
  }

  .footer-elements {
    font-size: 10px;
  }

  .image-container {
    --image-container-width: 135px;
    min-width: var(--image-container-width);
    padding: 0.5rem;
    margin-top: -1rem;
  }

  .img-copyright {
    font-size: 10px;
    padding: 0;
  }

  .logos-box img {
    height: 20px;
  }
}