style.css

:root {
  --purple: #500d78;
  --purple-light: #8f65a9;
  --purple-medium: #6f3990;
  --purple-medium-dark: #5f2384;
  --purple-dark: #3a0956;
  --purple-xdark: #310849;
  --purple-shadow: #1c0526;
  --black: #14011e;
  --white: #feffff;
  --white-shadow: rgba(20, 1, 30, 0.15);
  --shadow: #6f3890;
  --shadow-dark: #4b0c72;
  --shadow-medium: #572179;
}

html,
body {
  height: 100%;
  width: 100%;
  overflow: hidden;
  padding: 0;
  margin: 0;
}

body {
  background: var(--purple);
  display: flex;
  align-items: center;
  justify-content: center;
}

html {
  box-sizing: border-box;
}

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

* {
  position: absolute;
}

*:before,
*:after {
  content: "";
  position: absolute;
}

body {
  background: var(--purple);
  min-height: 100vh;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.container {
  width: 820px;
  height: 620px;
  position: relative;
  overflow: visible;
}

.window-group {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%) scale(1.1);
  transform-origin: center center;
  z-index: 2;
  width: 200px;
  height: 250px;
}

.window-group .window {
  width: 100%;
  height: 100%;
  border: 10px solid var(--purple-xdark);
  background-color: var(--purple-dark);
  border-radius: 3px;
}

.window-group .window:after {
  top: 100%;
  width: 120%;
  height: 16px;
  background-color: var(--purple-xdark);
  left: -10%;
  border-radius: 3px;
}

.window-group .window:before {
  width: 100%;
  height: 14px;
  background-color: var(--purple-xdark);
  top: 40%;
  z-index: 3;
  box-shadow: 0 -5px var(--purple-light);
}

.window-group .window .window-reflections {
  background-color: var(--purple-light);
  bottom: -16px;
  right: -18px;
  width: 50px;
  height: 16px;
  z-index: 2;
  border-radius: 3px;
  opacity: 0.4;
}

.window-group .window .window-reflections:before {
  background-color: var(--purple-light);
  right: 0px;
  width: 155px;
  height: 16px;
  z-index: 2;
  border-radius: 5px 3px 3px 3px;
  opacity: 0.3;
}

.window-group .window .window-reflections:nth-child(2) {
  bottom: 0px;
  right: -10px;
  width: 10px;
  height: 90px;
  border-radius: 50px 0 0 0;
}

.window-group .window .window-reflections:nth-child(2):before {
  bottom: 0px;
  right: 0px;
  width: 100%;
  height: 220px;
  z-index: 2;
  border-radius: 5px 3px 3px 3px;
}

.window-group .window .window-reflections:nth-child(3) {
  background-color: var(--purple-light);
  bottom: 124px;
  right: 0px;
  width: 130px;
  height: 14px;
  z-index: 10;
  opacity: 0.1;
  border-radius: 50px 0 0 0;
}

.window-group .window .window-reflections:nth-child(3):before,
.window-group .window .window-reflections:nth-child(3):after {
  content: none;
}

.window-group .window .window-in {
  width: 100%;
  height: 100%;
  border: 6px solid var(--purple-light);
  border-top: 0;
  overflow: hidden;
}

.cat {
  width: 100px;
  z-index: 4;
  height: 150px;
  bottom: 7px;
  left: 80px;
  transform: scale(0.9);
  transform-origin: bottom center;
}

.cat .cat-tail {
  background-color: var(--purple-shadow);
  height: 40px;
  width: 13px;
  border-radius: 50px;
  bottom: -25px;
  right: -0px;
}

.cat .cat-tail .tail {
  bottom: 2px;
  background-color: var(--purple-shadow);
  height: 12px;
  width: 13px;
  border-radius: 20px 20px 0 0px;
  z-index: 1;
  animation: tail 15s ease infinite;
  transform: rotate(13deg);
  transform-origin: center center;
}

.cat .cat-tail .tail .tail {
  bottom: -40%;
}

.cat .cat-tail .tail.last {
  border-radius: 20px;
}

.cat .cat-body {
  width: 70px;
  height: 80px;
  background-color: var(--purple-shadow);
  bottom: 0;
  right: 0;
  border-radius: 0 50% 20% 0;
  animation: cat 15s ease infinite;
  transform-origin: bottom center;
}

.cat .cat-paw {
  bottom: 0;
  background-color: var(--purple-shadow);
  width: 30px;
  height: 11px;
  border-radius: 50px;
  left: 24px;
}

.cat .cat-paw:after {
  height: 60px;
  width: 10px;
  background-color: var(--purple-dark);
  border-radius: 4px;
  left: 0px;
  bottom: 12px;
  box-shadow: 1px 0 var(--purple-light);
}

.cat .cat-neck {
  bottom: 80px;
  right: 44px;
  transform: rotate(-13deg);
}

.cat .cat-neck .neck {
  bottom: 2px;
  background-color: var(--purple-shadow);
  height: 12px;
  width: 15px;
  border-radius: 0 0px 20px 20px;
  z-index: 1;
  transform: rotate(-5deg);
  transform-origin: center center;
}

.cat .cat-neck .neck .neck {
  bottom: -28%;
}

.cat .cat-head {
  width: 50px;
  height: 40px;
  background-color: var(--purple-shadow);
  border-radius: 18px;
  bottom: 70px;
  left: 18px;
  transform: rotate(3deg);
  animation: cat-head 15s ease infinite;
}

.cat .cat-head .ear {
  width: 24px;
  height: 22px;
  top: -1px;
  left: -1px;
  transform: rotate(45deg);
  animation: ear-left 15s ease infinite;
}

.cat .cat-head .ear .ear-in {
  width: 100%;
  height: 100%;
  background-color: var(--purple-shadow);
  transform: skew(35deg);
  border-radius: 5px;
  overflow: hidden;
}

.cat .cat-head .ear:nth-child(2) {
  left: 24px;
  top: -1px;
  transform: rotate(60deg);
  animation: ear-right 15s ease infinite;
}

.moon {
  width: 50px;
  height: 50px;
  top: 10%;
  right: 15%;
  border-radius: 50%;
  z-index: 2;
  background-color: var(--white);
  box-shadow: 0 0 10px var(--white), 0 0 0 25px rgba(143, 101, 169, 0.3),
    0 0 0 50px rgba(143, 101, 169, 0.2), 0 0 0 75px rgba(143, 101, 169, 0.1);
}

.moon .craters {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--white-shadow);
  left: 10px;
  top: 10px;
}

.moon .craters:after {
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background-color: var(--white-shadow);
  left: 15px;
  top: 10px;
}

.moon .craters:before {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--white-shadow);
  left: 0px;
  top: 20px;
}

.stars {
  width: calc(100% - 40px);
  height: 35%;
  top: 10px;
  left: 20px;
}

.stars .star {
  border-radius: 50%;
  background-color: var(--white);
  animation: twinkle 5s linear infinite;
  width: 3px;
  height: 3px;
  top: 10px;
  left: 12px;
  opacity: 0.8;
}

.stars .star:nth-child(2) {
  top: 20px;
  left: 32px;
  width: 4px;
  height: 4px;
  animation-delay: 1s;
}

.stars .star:nth-child(3) {
  top: 40px;
  left: 6px;
  width: 5px;
  height: 5px;
  animation-delay: 2s;
}

.stars .star:nth-child(4) {
  top: 60px;
  left: 65px;
  width: 3px;
  height: 3px;
  animation-delay: 3s;
}

.stars .star:nth-child(5) {
  top: 52px;
  left: 42px;
  width: 3px;
  height: 3px;
  animation-delay: 4s;
}

.ghost-group {
  width: 40px;
  height: 50px;
  bottom: 50px;
  left: -150px;
  animation: slide 15s ease infinite;
}

.ghost {
  width: 40px;
  height: 50px;
  background: var(--white);
  border-radius: 30px 30px 7px 7px;
  animation: float 1s linear infinite;
}

.ghost:after {
  width: 40px;
  height: 50px;
  border-radius: 30px 30px 7px 7px;
  box-shadow: -10px 0 var(--white-shadow);
  left: 10px;
}

.ghost .eyes {
  background-color: var(--purple-shadow);
  width: 8px;
  height: 10px;
  border-radius: 50px;
  left: 30%;
  top: 20%;
  box-shadow: 13px 0 var(--purple-shadow);
}

.ghost .bottom {
  width: 100%;
  height: 15px;
  bottom: -10px;
}

.ghost .bottom .bottom-part {
  background-color: var(--purple-dark);
  border-radius: 5px;
  width: 15px;
  height: 15px;
  transform: rotate(45deg);
  left: 3px;
  animation: ghost-bottom 3s linear infinite;
}

.ghost .bottom .bottom-part:nth-child(2) {
  left: 22px;
  animation-delay: 1s;
}

.ghost .bottom .bottom-part:nth-child(3) {
  left: 14px;
  bottom: 11px;
  animation: none;
  width: 12px;
  height: 12px;
  border-radius: 3px;
  background-color: white;
}

.shadow {
  z-index: 1;
  background-color: var(--shadow);
}

.top {
  background-color: transparent;
  border-color: var(--shadow-dark);
}

.window-group.shadow {
  background-color: transparent;
  transform: scale(1.1, 1.1) translate(-100px, -105px);
}

.window-group.shadow .window {
  background-color: var(--shadow-dark);
  border-color: transparent;
}

.window-group.shadow .window:before {
  content: none;
}

.window-group.shadow .window:after {
  background-color: var(--shadow-dark);
}

.cat-tail.shadow {
  transform: scale(1.15, 1.1) translate(-8px, 0px);
  background-color: var(--shadow-medium);
  z-index: -1;
}

.cat-tail.shadow .tail {
  background-color: var(--shadow-medium);
}

.cat-tail.highlight {
  transform: translate(1px, 1px);
  background-color: #a47dba;
  z-index: 0;
}

.cat-tail.highlight .tail {
  background-color: #a47dba;
}

.cat.highlight {
  transform: translate(-1px, -2px) scale(0.92);
  transform-origin: bottom center;
}

.cat.highlight * {
  background-color: var(--purple-light);
}

.cat.highlight .neck {
  background-color: var(--purple-light);
}

.cat.highlight .cat-head .ear {
  background-color: transparent;
}

.cat.highlight .cat-head .ear .ear-in {
  background-color: var(--purple-light);
}

@keyframes float {
  50% {
    transform: translateY(3px);
  }
}

@keyframes slide {
  0%,
  15%,
  55%,
  100% {
    transform: translateX(0px);
  }
  25%,
  45% {
    transform: translateX(170px);
  }
}

@keyframes cat {
  0%,
  20%,
  50%,
  100% {
    transform: scaleX(1);
  }
  21%,
  45% {
    transform: scaleX(1.1);
  }
}

@keyframes cat-head {
  0%,
  20%,
  50%,
  100% {
    transform: scaleY(1);
  }
  21%,
  45% {
    transform: scaleY(0.85) translateY(2px);
  }
}

@keyframes ear-right {
  0%,
  20%,
  50%,
  100% {
    transform: rotate(60deg);
  }
  21%,
  45% {
    transform: rotate(80deg);
  }
}

@keyframes ear-left {
  0%,
  20%,
  50%,
  100% {
    transform: rotate(45deg);
  }
  21%,
  45% {
    transform: rotate(25deg);
  }
}

@keyframes tail {
  0%,
  20%,
  75%,
  100% {
    transform: rotate(-13deg);
  }
  21%,
  45% {
    transform: rotate(0deg) scale(1.1);
  }
  10%,
  55%,
  85% {
    transform: rotate(13deg);
  }
}

@keyframes ghost-bottom {
  50% {
    transform: translateY(2px) rotate(45deg) scale(1.1);
  }
}

.ghost-group {
  width: 40px;
  height: 50px;
  bottom: 50px;
  left: -150px;
  animation: slide 15s ease infinite;
}

.stars .star {
  border-radius: 50%;
  background-color: var(--white);
  animation: twinkle 5s linear infinite;
  width: 3px;
  height: 3px;
  top: 10px;
  left: 12px;
  opacity: 0.8;
}

.stars .star:nth-child(2) {
  top: 20px;
  left: 32px;
  width: 4px;
  height: 4px;
  animation-delay: 1s;
}

.stars .star:nth-child(3) {
  top: 40px;
  left: 6px;
  width: 5px;
  height: 5px;
  animation-delay: 2s;
}

.stars .star:nth-child(4) {
  top: 60px;
  left: 65px;
  width: 3px;
  height: 3px;
  animation-delay: 3s;
}

.stars .star:nth-child(5) {
  top: 52px;
  left: 42px;
  width: 3px;
  height: 3px;
  animation-delay: 4s;
}

@media (max-width: 850px) {
  .container {
    width: 95vw;
    height: 95vh;
    max-height: 620px;
  }

  .window-group {
    transform: translate(-50%, -50%) scale(0.9);
  }
}

@media (max-width: 820px) {
  .container {
    width: 100%;
    height: auto;
    min-height: 620px;
  }

  .window-group {
    transform: scale(0.9);
  }

  .cat {
    transform: scale(0.8);
  }
}

@media (max-width: 480px) {
  .window-group {
    transform: scale(0.7);
  }

  .cat {
    transform: scale(0.6);
  }

  .moon {
    transform: scale(0.8);
  }
}