:root {
  --white: #ffffff;
  --main-bg: #fcf7ec;
  --orange: #ff6d00;
  --light_green: #c2f4d1;
  --darkgreen: #05271c;
  --grey: #9a9b96;
  --font-poppins-regular: Poppins, sans-serif;
  --font-poppins-medium: Poppins, sans-serif;
  --font-poppins-extra-light: Poppins, sans-serif;
  --font-montserrat: Montserrat, sans-serif;
}

#navigation {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 8rem;
  background-size: cover;
  background-image: url(../images/background/background.png);
  background-size: 100% 8rem;
  background-repeat: no-repeat;
  color: var(--darkgreen);
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 100;
}

#logo {
  padding: 0 !important;
  margin-left: 1rem;
  width: 18rem;
  display: flex;
  align-items: center;
  justify-content: flex-start;
}

#logo img {
    width: 100%;
    height: auto;
}

#menu {
  width: calc(100% - 37rem);
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  font-family: var(--font-poppins-extra-light);
  font-size: 1.8rem;
  height: 100%;
  margin: 0 !important;
  padding: 0 !important;
}

#menu ul {
  list-style-type: none;
  position: relative;
  left: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 50%;
  height: 100%;
  padding: 0 !important;
  margin: 0 !important;
}

#menu ul li {
  /* margin-right: 0.5rem;
  margin-left: 0.5rem; */
  margin-right: 2.5rem !important;
  margin-left: 2.5rem !important;
}

#menu ul li a {
  display: block;
  width: 4.5rem;
  height: 4.5rem;
}

#mathgpt-button,
#graphgpt-button,
#geogpt-button,
#examgpt-button,
#teachergpt-button {
  background: transparent;
  background-size: contain;
  background-repeat: no-repeat;
  width: 4.5rem;
  height: 4.5rem;
  border: none;
  cursor: pointer;
}

#examgpt-button,
#teachergpt-button {
  background-size: cover;
}

#mathgpt-button {
  background-image: url(../images/icons/app_navigation/mathgpt_main.png);
}

#examgpt-button {
  background-image: url(../images/icons/app_navigation/examgpt.png);
}

#teachergpt-button {
  background-image: url(../images/icons/app_navigation/teachers.png);
}

#mathgpt-button:hover {
  background-image: url(../images/icons/app_navigation/mathgpt_hover.png);
}

#examgpt-button:hover {
  background-image: url(../images/icons/app_navigation/examgpt_hover.png);
}

#teachergpt-button:hover {
  background-image: url(../images/icons/app_navigation/teachers_hover.png);
}

#graphgpt-button {
  background-image: url(../images/icons/app_navigation/graphgpt.png);
}

#graphgpt-button:hover {
  background-image: url(../images/icons/app_navigation/graphgpt_hover.png);
}

#geogpt-button {
  background-image: url(../images/icons/app_navigation/geogpt.png);
}

#geogpt-button:hover {
  background-image: url(../images/icons/app_navigation/geogpt_hover.png);
}


#assist-buttons {
  width: 18rem;
  height: 100%;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  margin: 0;
  padding: 0;
  margin-right: 1rem;
}

#assist-buttons a {
  display: flex;
  justify-content: center;
  align-items: center;
}

#assist-buttons a.user-portal-btn {
  width: 4rem;
  height: 4rem;
  margin-right: 2rem;
  cursor: pointer;
}

#assist-buttons a.user-portal-btn svg {
  width: 4rem;
  height: 4rem;
  fill: #ff6d00;
  -webkit-transition: 0.3s;
  -moz-transition: 0.3s;
  -ms-transition: 0.3s;
  -o-transition: 0.3s;
  transition: 0.3s;
}

#assist-buttons a.user-portal-btn svg:hover,
#assist-buttons a.user-portal-btn svg:focus,
#assist-buttons a.user-portal-btn svg:active {
  fill: #c2f4d1;
}

.button-img0,
.logout-button {
  background: transparent;
  background-size: contain;
  background-repeat: no-repeat;
  border: none;
  cursor: pointer;
  margin: 0 1rem;
}

.button-img0 {
  background-image: url(../images/icons/app_navigation/help.png);
  width: 4rem;
  height: 4rem;
  background-size: 4rem 4rem;
}

.button-img0:hover {
  background-image: url(../images/icons/app_navigation/help_hover.png);
}

.logout-button {
  background-image: url(../images/icons/app_navigation/logout.png);
  width: 5rem;
  height: 4rem;
  background-size: 5rem 4rem;
}

.logout-button:hover {
  background-image: url(../images/icons/app_navigation/logout_hover.png);
}

#hamburger-button {
  display: none;
  font-size: 3.2rem;
  color: var(--white);
  box-shadow: 2px 2px 10px rgba(0, 0, 0, 0.2);
  transition: background-color 0.3s, color 0.3s;
  z-index: 100;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  -webkit-border-radius: 0.5rem;
  -moz-border-radius: 0.5rem;
  -ms-border-radius: 0.5rem;
  -o-border-radius: 0.5rem;
  border-radius: 0.5rem;
  padding: 1rem 2rem;
  cursor: pointer;
}

#hamburger-button:hover {
  background: var(--orange);
  color: var(--darkgreen);
}

.mobile-menu {
  display: none;
  top: 6rem;
}

#mobile-menu a {
  color: var(--white);
  text-decoration: none;
  display: inline-block;
  padding: 0.5rem 1rem;
}

#mobile-menu a:hover {
  background-color: var(--orange);
  border-radius: 0.5rem;
  outline: none;
}

#mobile-menu a:focus {
  outline: none;
}

@media only screen and (max-width: 991px) {

  #menu,
  #hamburger-button {
    display: block;
  }

  #hamburger-button {
    font-size: 2.5rem;
  }

  #navigation {
    height: 6rem;
  }

  #menu {
    width: 75%;
    margin: 0 auto !important;
  }

  #menu ul {
    list-style-type: none;
    position: relative;
    left: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: auto;
    margin: 5rem auto !important;
  }

  #menu ul li a {
    display: block;
    width: auto !important;
    height: auto !important;
  }

  #graphgpt-button,
  #mathgpt-button,
  #geogpt-button,
  #examgpt-button,
  #teachergpt-button {
    display: none;
  }

  #assist-buttons {
    display: flex;
  }

  .close-menu {
    position: absolute;
    right: 2rem;
    top: 2rem;
    color: white;
    cursor: pointer;
    font-size: 3rem;
  }

  #navigation {
    padding: 0;
  }

  #mobile-menu {
    width: 100%;
    padding-top: 6rem;
    position: fixed;
    left: 0;
    top: 0;
    width: 34rem;
    background: #05271c;
    height: 100vh;
  }

  #assist-buttons_mobile a.user-portal-btn svg {
    width: 4rem;
    height: 4rem;
    fill: #ff6d00;
    -webkit-transition: 0.3s;
    -moz-transition: 0.3s;
    -ms-transition: 0.3s;
    -o-transition: 0.3s;
    transition: 0.3s;
  }

  #menu ul {
    flex-direction: column;
  }

  #menu ul li {
    margin-right: 0;
    margin-bottom: 15px;
  }

  #menu ul li a {
    font-size: 1.4em;
  }

  /* #logo {
    margin-left: 4rem;
    width: 50%;
    height: auto;
  } */
}

@media only screen and (max-width: 668px) {
  #mobile-menu {
    width: 32rem;
  }
}

@media only screen and (max-width: 580px) {
  #navigation {
    height: 8rem;
  }
}

@media only screen and (max-width: 460px) {
  #mobile-menu {
    width: 30rem;
  }
}

@media only screen and (max-width: 400px) {
  #mobile-menu {
    width: 26rem;
  }
}

@media only screen and (max-width: 360px) {
  #mobile-menu {
    width: 24rem;
  }
}