*,
*::before,
*::after {
  padding: 0;
  margin: 0;
  box-sizing: inherit;
}

::selection {
  background-color: white;
  color: royalblue;
}

html {
  font-size: 62.5%;
}

@media only screen and (max-width: 28.125em) {
  html {
    font-size: 50%;
  }
}

body {
  box-sizing: border-box;
  font-family: sans-serif;
  background-image: linear-gradient(to right bottom, hotpink, indianred);
  line-height: 1.4;
}

body.body-dark-theme {
  background-image: linear-gradient(to right bottom, #222, #555);
}

#main-container {
  margin: 0 auto;
  background-color: royalblue;
  color: white;
  height: 100vh;
  box-shadow: 1rem 0 4rem rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  max-width: 100rem;
  animation: fadeInscaleOut 1s;
  animation-fill-mode: backwards;
  transition: all 0.5s;
}

#main-container.main-container-dark-theme {
  background-color: black;
}
/* Header section 🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶 */
.header {
  background-color: inherit;
  height: calc(7rem - 3px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  border-bottom: 3px solid royalblue;
}

/* Style in dark theme */
#main-container.main-container-dark-theme .header {
  border-color: #888;
}

.heading-primary {
  font-size: 3rem;
}

.menu-bar {
  height: 4rem;
  width: 4rem;
  cursor: pointer;
}

.menu-bar__icon {
  background-color: white;
  height: 0.3rem;
  width: 100%;
  display: inline-block;
}

.menu-bar:hover .menu-bar__icon {
  opacity: 0.8;
}

.menu {
  position: fixed;
  top: 7.3rem;
  right: 1rem;
  background-color: rgba(65, 105, 225, 0.9);
  transition: all 0.5s;
  visibility: hidden;
  opacity: 0;
  transform: translateY(-100%);
  z-index: 2;
}

.menu.visible {
  visibility: visible;
  opacity: 1;
  transform: translateY(0);
}

.menu.menu-dark-theme {
  background-color: rgba(0, 0, 0, 0.9);
}

.menu-list {
  list-style: none;
  display: block;
}

.menu-list-item {
  transition: all 0.3s;
  font-size: 2rem;
  padding: 1rem 2rem;
  cursor: pointer;
}

.change-name {
}
.change-name.faded {
  opacity: 0.5;
  cursor: not-allowed;
}

.menu-list-item a:link,
.menu-list-item a:visited {
  text-decoration: none;
  color: white;
}

.menu-list-item:not(:last-of-type) {
  border-bottom: 1px solid #ccc;
}

.menu-list-item:hover {
  background-color: hotpink;
}

/* Main section 🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶 */
#main {
  position: relative;
  background-color: white;
  flex: 1;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  overflow-y: scroll;
  transition: all 0.5s;
}

@media only screen and (max-width: 30em) {
  #main {
    padding: 1rem;
  }
}

#main::-webkit-scrollbar {
  background-color: pink;
  width: 0.5rem;
}

#main::-webkit-scrollbar-thumb {
  background-color: royalblue;
  height: 1rem;
  width: 0.6rem;
}

#main.main-dark-theme {
  background-color: #555;
}

#main.main-dark-theme::-webkit-scrollbar-thumb {
  background-color: black;
}

.message {
  background-color: hotpink;
  max-width: 60%;
  align-self: flex-start;
  padding: 1rem;
  border-radius: 2rem;
  margin-bottom: 2rem;
  font-size: 1.8rem;
  box-shadow: 0 0.4rem 0.6rem rgba(0, 0, 0, 0.3);
  transition: all 0.5s;
  animation: moveLeftDown 0.5s;
}

#main.main-dark-theme .message {
  background-color: #222;
}

@media only screen and (max-width: 30em) {
  .message {
    max-width: 75%;
  }
}

.message--right {
  align-self: flex-end;
  background-color: indianred;
  border: 2px solid indianred;
  transition: all 0.5s;
  animation: moveRightUp 0.5s;
}

#main.main-dark-theme .message--right {
  background-color: #3e3e3e;
  border-color: black;
}

.message--right .message__sender {
  color: rgb(248, 193, 193);
}

.message__sender {
  font-weight: bold;
  font-style: italic;
  margin-bottom: 0.3rem;
  font-size: inherit;
  color: pink;
  font-size: 1.5rem;
}

.message__content {
  font-size: inherit;
  word-wrap: wrap;
}

.message__content span {
  color: rgb(96, 238, 96);
}

.message .message__content::selection {
  color: hotpink;
}
#main.main-dark-theme .message .message__content::selection {
  background-color: hotpink;
  color: white;
}
.message--right .message__content::selection {
  color: indianred;
}
#main.main-dark-theme .message--right .message__content::selection {
  background-color: indianred;
  color: white;
}

/* Footer section 🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶🔶 */
#footer {
  /* width: 100%; */
  background-color: inherit;
  height: calc(7rem - 3px);
  display: flex;
  align-items: center;
  padding: 1.3rem 2rem;
  border-top: 3px solid royalblue;
}

#footer.game-ended {
  display: none;
}

#main-container.main-container-dark-theme #footer {
  border-color: #888;
}

@media only screen and (max-width: 30em) {
  #footer {
    padding: 1.3rem 0.8rem;
  }
}

.chat {
  color: rgb(83, 81, 81);
  width: 90%;
  margin-right: 2rem;
  align-self: stretch;
  padding: 0 2rem;
  border: 1px solid white;
  border-radius: 100px;
  font-size: 2.5rem;
  cursor: pointer;
  letter-spacing: 0.7px;
  transform: scaleX(0.95);
  transition: all 0.3s;
}

@media only screen and (max-width: 30em) {
  .chat {
    font-size: 2.3rem;
  }
}

.chat:focus {
  outline: none;
  box-shadow: 0 0.6rem 0.6rem rgba(0, 0, 0, 0.5);
  transform: scaleX(1);
}

.chat::placeholder {
  font-size: 2.3rem;
  color: rgb(179, 176, 176);
  font-style: italic;
  /* mar */
}

@media only screen and (max-width: 30em) {
  .chat::placeholder {
    font-size: 2rem;
  }
}

.send-message {
  height: 5rem;
  width: 5rem;
  border-radius: 100px;
  font-size: 5rem;
  background-color: white;
  color: green;
  box-shadow: 0 0.6rem 0.6rem rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  padding-bottom: 0.7rem;
  cursor: pointer;
  transition: all 0.3s;
}

@media only screen and (max-width: 30em) {
  .send-message {
    height: 4rem;
    width: 4rem;
    font-size: 4rem;
  }
}

.send-message:hover {
  background-color: green;
  color: white;
}

button {
  border: none;
  border-radius: 10px;
  padding: 1rem 2rem;
  margin-top: 0.5rem;
  background-color: green;
  color: white;
  font-size: 2rem;
  box-shadow: 0.5rem 0.5rem 0.5rem rgba(0, 0, 0, 0.3);
  transform: scale(0.95);
  transition: all 0.3s;
  animation: appearAfterABit 0.5s 1s ease-out;
  animation-fill-mode: backwards;
}
button:hover {
  background-color: lightgreen;
  color: black;
  box-shadow: 1rem 1rem 1rem rgba(0, 0, 0, 0.3);
  transform: scale(1);
}
button:focus {
  outline: none;
}
button:active {
  background-color: greenyellow;
}

/* certificate section */
.certificate {
  position: absolute;
  position: fixed;
  z-index: 3;
  width: 100%;
  max-width: 100rem;
  padding: 4rem;
  height: 100%;
  top: 50%;
  left: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transform: translate(-50%, -50%) scale(0.3) rotate(360deg);
  background-image: linear-gradient(to right bottom, royalblue, hotpink);
  visibility: hidden;
  opacity: 0;
  transition: all 1s ease-out;
  animation: blinkBackground 2s infinite;
}

.certificate.visible {
  visibility: visible;
  opacity: 1;
  transform: translate(-50%, -50%) scale(1) rotate(0);
}

.close-cert,
.print-cert {
  color: white;
  align-self: flex-end;
  font-size: 1.4rem;
  border-bottom: 1px solid currentcolor;
  cursor: pointer;
  transition: all 0.1s;
  transform: translateY(-5rem);
}

.close-cert:hover,
.print-cert:hover {
  color: purple;
}

.certificate .heading {
  margin-bottom: 4rem;
  font-size: 2.5rem;
  color: wheat;
  text-transform: uppercase;
  word-spacing: 5px;
  animation: pulsate 2s infinite;
}

.certificate h2 {
  font-size: 3rem;
  font-family: cursive;
}

@media only screen and (max-width: 30em) {
  .certificate h2 {
    font-size: 2rem;
  }
}

.certificate .signature {
  margin-top: 2rem;
  justify-self: flex-end;
  align-self: start;
  display: flex;
  align-items: center;
  font-size: 1.5rem;
}

.certificate p span img {
  height: 5rem;
  margin-left: 0.6rem;
}

.certificate span {
  color: greenyellow;
}

.cert-foot {
  text-align: center;
  margin-top: 3rem;
  font-size: 1.2rem;
}

.cert__baloons {
  font-size: 3.5rem;
  /* position: absolute; */
  animation: moveLeftDown 2s infinite alternate;
}

.cert__baloons--1 {
  top: 5%;
  left: 5%;
}

.cert__baloons--2 {
  top: 5%;
  right: 5%;
}

.cert__baloons--3 {
  bottom: 5%;
  right: 50%;
  /* animation: moveRightUp 2s infinite alternate; */
}

@keyframes fadeInscaleOut {
  from {
    transform: scale(0);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes moveRightUp {
  from {
    transform: translate(-70vw, 75vh);
    opacity: 0;
  }
  to {
    transform: translate(0, 0);
    opacity: 1;
  }
}

@keyframes moveLeftDown {
  from {
    transform: translate(-10vw, -70vh);
    opacity: 0;
  }
  to {
    transform: translate(0, 0);
    opacity: 1;
  }
}

@keyframes appearAfterABit {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes blinkBackground {
  0% {
    background-image: linear-gradient(to right bottom, royalblue, hotpink);
  }

  25% {
    background-image: linear-gradient(to right bottom, red, white);
  }

  50% {
    background-image: linear-gradient(to right bottom, white, red);
  }

  75% {
    background-image: linear-gradient(to right bottom, green, yellow);
  }

  100% {
    background-image: linear-gradient(to right bottom, royalblue, hotpink);
  }
}

@keyframes pulsate {
  0% {
    transform: scale(1);
    color: wheat;
  }
  50% {
    transform: scale(1.1);
    color: white;
  }
  100% {
    transform: scale(1);
    color: wheat;
  }
}