<template>
  <div class="containerer">
    <div class="container container-star">
      <div class="star-1" v-for="item in 30" :key="item"></div>
      <div class="star-2" v-for="item in 30" :key="item"></div>
    </div>
    <div class="container container-bird">
      <div class="bird bird-anim">
        <div class="bird-container">
          <div class="wing wing-left">
            <div class="wing-left-top"></div>
          </div>
          <div class="wing wing-right">
            <div class="wing-right-top"></div>
          </div>
        </div>
      </div>
      <div class="bird bird-anim">
        <div class="bird-container">
          <div class="wing wing-left">
            <div class="wing-left-top"></div>
          </div>
          <div class="wing wing-right">
            <div class="wing-right-top"></div>
          </div>
        </div>
      </div>
      <div class="bird bird-anim">
        <div class="bird-container">
          <div class="wing wing-left">
            <div class="wing-left-top"></div>
          </div>
          <div class="wing wing-right">
            <div class="wing-right-top"></div>
          </div>
        </div>
      </div>
      <div class="bird bird-anim">
        <div class="bird-container">
          <div class="wing wing-left">
            <div class="wing-left-top"></div>
          </div>
          <div class="wing wing-right">
            <div class="wing-right-top"></div>
          </div>
        </div>
      </div>
      <div class="bird bird-anim">
        <div class="bird-container">
          <div class="wing wing-left">
            <div class="wing-left-top"></div>
          </div>
          <div class="wing wing-right">
            <div class="wing-right-top"></div>
          </div>
        </div>
      </div>
      <div class="bird bird-anim">
        <div class="bird-container">
          <div class="wing wing-left">
            <div class="wing-left-top"></div>
          </div>
          <div class="wing wing-right">
            <div class="wing-right-top"></div>
          </div>
        </div>
      </div>
      <div class="container-title">
        <div class="title">
          <div class="number">4</div>
          <div class="moon">
            <div class="face">
              <div class="mouth"></div>
              <div class="eyes">
                <div class="eye-left"></div>
                <div class="eye-right"></div>
              </div>
            </div>
          </div>
          <div class="number">4</div>
        </div>
        <div class="subtitle">抱歉，您访问的页面不存在！</div>
        <button class="backbtn" @click="router.push({ name: '/index' })">
          返回首页
        </button>
      </div>
    </div>
  </div>
</template>
<script setup>
import { useRouter } from "vue-router";
const router = useRouter();
</script>
<style lang="scss" scoped>
@import url("https://fonts.googleapis.com/css?family=Lato|Russo+One");
*,
*:after,
*:before {
  box-sizing: border-box;
}
body {
  padding: 0;
  margin: 0;
}
.container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  overflow: hidden;
}

//stars
.container-star {
  background-image: linear-gradient(
    to bottom,
    #04112b 0%,
    #474c88 70%,
    #a871d6 100%
  );
  &:after {
    background: radial-gradient(
      ellipse at center,
      rgba(255, 255, 255, 0) 0%,
      rgba(255, 255, 255, 0) 40%,
      rgba(15, 10, 38, 0.2) 100%
    );
    content: "";
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
  }
}
.star-1 {
  position: absolute;
  border-radius: 50%;
  background-color: #ffffff;
  animation: twinkle 5s infinite ease-in-out;
  &:after {
    height: 100%;
    width: 100%;
    transform: rotate(90deg);
    content: "";
    position: absolute;
    background-color: #fff;
    border-radius: 50%;
  }
  &:before {
    background: radial-gradient(
      ellipse at center,
      rgba(255, 255, 255, 0.5) 0%,
      rgba(255, 255, 255, 0) 60%,
      rgba(255, 255, 255, 0) 100%
    );
    position: absolute;
    border-radius: 50%;
    content: "";
    top: -20%;
    left: -50%;
  }
}
@for $i from 1 through (30) {
  $top: random(100) + vh;
  $left: random(100) + vw;
  $size: random(6) + 3px;
  .star-1:nth-of-type(#{$i}) {
    top: $top;
    left: $left;
    width: $size;
    height: calc($size / 3);
    animation-delay: random(5) + s;
    &:before {
      width: $size * 2;
      height: $size * 2;
      top: -250%;
    }
  }
}
.star-2 {
  position: absolute;
  border-radius: 50%;
  background-color: #ffffff;
  animation: twinkle 5s infinite ease-in-out;
}
@for $i from 31 through (60) {
  $top: random(100) + vh;
  $left: random(100) + vw;
  $size: random(3) + 1px;
  .star-2:nth-of-type(#{$i}) {
    top: $top;
    left: $left;
    width: $size;
    height: $size;
    animation-delay: random(5) + s;
    &:before {
      width: $size * 2;
      height: $size * 2;
      top: -250%;
    }
  }
}

//text and moon
.container-title {
  width: 600px;
  height: 450px;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  position: absolute;
  color: white;
  line-height: 1;
  font-weight: 700;
  text-align: center;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  display: flex;
}
.title > * {
  display: inline-block;
  font-size: 200px;
}
.number {
  text-shadow: 20px 20px 20px rgba(0, 0, 0, 0.2);
  padding: 0 0.2em;
}
.subtitle {
  font-size: 24px;
  margin-top: 3em;
  text-shadow: 4px 4px 4px rgba(0, 0, 0, 0.2);
  font-weight: normal;
}
button {
  font-size: 14px;
  margin-top: 2em;
  padding: 0.5em 1em;
  letter-spacing: 1px;
  color: white;
  background-color: transparent;
  border: 0;
  cursor: pointer;
  z-index: 999;
  border: 1px solid white;
  border-radius: 5px;
  text-shadow: 4px 4px 4px rgba(0, 0, 0, 0.2);
  transition: opacity 0.2s ease;
  &:hover {
    opacity: 0.7;
  }
  &:focus {
    outline: 0;
  }
}
.moon {
  position: relative;
  border-radius: 50%;
  width: 160px;
  height: 160px;
  z-index: 2;
  background-color: #fff;
  box-shadow: 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #fff, 0 0 40px #fff,
    0 0 70px #fff, 0 0 80px #fff, 0 0 100px #ff1177;
  animation: rotate 5s ease-in-out infinite;
  .face {
    top: 60%;
    left: 47%;
    position: absolute;
    .mouth {
      border-top-left-radius: 50%;
      border-bottom-right-radius: 50%;
      border-top-right-radius: 50%;
      background-color: #5c3191;
      width: 25px;
      height: 25px;
      position: absolute;
      animation: snore 5s ease-in-out infinite;
      transform: rotate(45deg);
      box-shadow: inset -4px -4px 4px rgba(0, 0, 0, 0.3);
    }
    .eyes {
      position: absolute;
      top: -30px;
      left: -30px;
      .eye-left,
      .eye-right {
        border: 4px solid #5c3191;
        width: 30px;
        height: 15px;
        border-bottom-left-radius: 100px;
        border-bottom-right-radius: 100px;
        border-top: 0;
        position: absolute;
        &:before,
        &:after {
          content: "";
          position: absolute;
          border-radius: 50%;
          width: 4px;
          height: 4px;
          background-color: #5c3191;
          top: -2px;
          left: -4px;
        }
        &:after {
          left: auto;
          right: -4px;
        }
      }
      .eye-right {
        left: 50px;
      }
    }
  }
}

//birds
.container-bird {
  perspective: 2000px;
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
}
.bird {
  position: absolute;
  z-index: 1000;
  left: 50%;
  top: 50%;
  height: 40px;
  width: 50px;
  transform: translate3d(-100vw, 0, 0) rotateY(90deg);
  transform-style: preserve-3d;
}
.bird-container {
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transform: translate3d(50px, 30px, -300px);
}
.wing {
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  border-radius: 3px;
  transform-style: preserve-3d;
  transform-origin: center bottom;
  z-index: 300;
}
.wing-left {
  background: linear-gradient(to bottom, #a58dc4 0%, #7979a8 100%);
  transform: translate3d(0, 0, 0) rotateX(-30deg);
  animation: wingLeft 1.3s cubic-bezier(0.45, 0, 0.5, 0.95) infinite;
}
.wing-right {
  background: linear-gradient(to bottom, #d9d3e2 0%, #b8a5d1 100%);
  transform: translate3d(0, 0, 0) rotateX(-30deg);
  animation: wingRight 1.3s cubic-bezier(0.45, 0, 0.5, 0.95) infinite;
}
.wing-right-top,
.wing-left-top {
  border-right: 25px solid transparent;
  border-left: 25px solid transparent;
  top: -20px;
  width: 100%;
  position: absolute;
  transform-origin: 100% 100%;
}
.wing-right-top {
  border-bottom: 20px solid #b8a5d1;
  transform: translate3d(0, 0, 0) rotateX(60deg);
  animation: wingRightTop 1.3s cubic-bezier(0.45, 0, 0.5, 0.95) infinite;
}
.wing-left-top {
  border-bottom: 20px solid #7979a8;
  transform: translate3d(0, 0, 0) rotateX(-60deg);
  animation: wingLeftTop 1.3s cubic-bezier(0.45, 0, 0.5, 0.95) infinite;
}
.bird-anim:nth-child(1) {
  animation: bird1 30s linear infinite forwards;
}
.bird-anim:nth-child(2) {
  animation: bird2 30s linear infinite forwards;
  animation-delay: 3s;
  z-index: -1;
}
.bird-anim:nth-child(3) {
  animation: bird3 30s linear infinite forwards;
  animation-delay: 5s;
}
.bird-anim:nth-child(4) {
  animation: bird4 30s linear infinite forwards;
  animation-delay: 7s;
}
.bird-anim:nth-child(5) {
  animation: bird5 30s linear infinite forwards;
  animation-delay: 14s;
}
.bird-anim:nth-child(6) {
  animation: bird6 30s linear infinite forwards;
  animation-delay: 10s;
  z-index: -1;
}

//keyframes
@keyframes rotate {
  0%,
  100% {
    transform: rotate(-8deg);
  }
  50% {
    transform: rotate(0deg);
  }
}

@keyframes snore {
  0%,
  100% {
    transform: scale(1) rotate(30deg);
  }
  50% {
    transform: scale(0.5) rotate(30deg);
    border-bottom-left-radius: 50%;
  }
}

@keyframes twinkle {
  0%,
  100% {
    opacity: 0.7;
  }
  50% {
    opacity: 0.3;
  }
}

@keyframes wingLeft {
  0%,
  100% {
    transform: translate3d(0, 0, 0) rotateX(-50deg);
  }
  50% {
    transform: translate3d(0, -20px, 0) rotateX(-130deg);
    background: linear-gradient(to bottom, #d9d3e2 0%, #b8a5d1 100%);
  }
}

@keyframes wingLeftTop {
  0%,
  100% {
    transform: translate3d(0, 0, 0) rotateX(-10deg);
  }
  50% {
    transform: translate3d(0px, 0px, 0) rotateX(-40deg);
    border-bottom: 20px solid #b8a5d1;
  }
}

@keyframes wingRight {
  0%,
  100% {
    transform: translate3d(0, 0, 0) rotateX(50deg);
  }
  50% {
    transform: translate3d(0, -20px, 0) rotateX(130deg);
    background: linear-gradient(to bottom, #a58dc4 0%, #7979a8 100%);
  }
}

@keyframes wingRightTop {
  0%,
  100% {
    transform: translate3d(0, 0, 0) rotateX(10deg);
  }
  50% {
    transform: translate3d(0px, 0px, 0px) rotateX(40deg);
    border-bottom: 20px solid #7979a8;
  }
}

@keyframes bird1 {
  0% {
    transform: translate3d(-120vw, -20px, -1000px) rotateY(-40deg) rotateX(0deg);
  }
  100% {
    transform: translate3d(100vw, -40vh, 1000px) rotateY(-40deg) rotateX(0deg);
  }
}

@keyframes bird2 {
  0%,
  15% {
    transform: translate3d(100vw, -300px, -1000px) rotateY(10deg) rotateX(0deg);
  }
  100% {
    transform: translate3d(-100vw, -20px, -1000px) rotateY(10deg) rotateX(0deg);
  }
}

@keyframes bird3 {
  0% {
    transform: translate3d(100vw, -50vh, 100px) rotateY(-5deg) rotateX(-20deg);
  }
  100% {
    transform: translate3d(-100vw, -10vh, 100px) rotateY(-5deg) rotateX(-20deg);
  }
}

@keyframes bird4 {
  0% {
    transform: translate3d(100vw, 30vh, 200px) rotateY(-5deg) rotateX(10deg);
  }
  100% {
    transform: translate3d(-100vw, -30vh, 200px) rotateY(-5deg) rotateX(10deg);
  }
}

@keyframes bird5 {
  0%,
  5% {
    transform: translate3d(100vw, 30vh, 400px) rotateY(-15deg) rotateX(-10deg);
  }
  100% {
    transform: translate3d(-100vw, 10vh, 400px) rotateY(-15deg) rotateX(-10deg);
  }
}

@keyframes bird6 {
  0%,
  10% {
    transform: translate3d(-100vw, 20vh, -500px) rotateY(15deg) rotateX(10deg);
  }
  100% {
    transform: translate3d(100vw, 40vh, -800px) rotateY(5deg) rotateX(10deg);
  }
}
@media screen and (max-width: 580px) {
  .container-404 {
    width: 100%;
  }
  .number {
    font-size: 100px;
  }
  .subtitle {
    font-size: 20px;
    padding: 0 1em;
  }
  .moon {
    width: 100px;
    height: 100px;
  }
  .face {
    transform: scale(0.7);
  }
}
</style>