Webleb - fragmentos de código - animación de avión

HTML

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
  <title>Uçuş Yolu ve Gündüz/Gece Teması</title>
  <style>
    :root {
      --sky-color-day: #87ceeb;
      --sky-color-night: #0b1d3a;
      --sun: #ffd700;
      --moon: #f0f8ff;
      --stars: #fff;
    }

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

body, html {
      width: 100%;
      height: 100%;
      overflow: hidden;
      font-family: sans-serif;
    }

.scene {
      width: 100%;
      height: 100vh;
      background: var(--sky-color-day);
      transition: background 2s ease-in-out;
      position: relative;
    }

body.dark .scene {
      background: var(--sky-color-night);
    }

.plane {
      width: 60px;
      height: 40px;
      background: gray;
      position: absolute;
      top: 50%;
      left: -60px;
      transform: translateY(-50%);
      border-radius: 10px;
      animation: fly 8s linear infinite;
      z-index: 2;
    }

.plane::after {
      content: '';
      position: absolute;
      top: 50%;
      left: -100vw;
      width: 100vw;
      height: 3px;
      background: linear-gradient(to right, rgba(255,255,255,0.5), transparent);
      transform: translateY(-50%);
      animation: fly-trail 8s linear infinite;
    }

@keyframes fly {
      0% {
        left: -60px;
      }
      100% {
        left: 100vw;
      }
    }

@keyframes fly-trail {
      0% {
        left: -100vw;
      }
      100% {
        left: 100vw;
      }
    }

.sun, .moon {
      width: 60px;
      height: 60px;
      border-radius: 50%;
      position: absolute;
      top: 10%;
      left: 80%;
      background: var(--sun);
      transition: background 2s ease-in-out, opacity 2s ease;
      z-index: 1;
    }

.moon {
      background: transparent;
    }

body.dark .sun {
      background: transparent;
    }

body.dark .moon {
      background: var(--moon);
    }

.stars {
      position: absolute;
      width: 100%;
      height: 100%;
      top: 0;
      left: 0;
      background-image: radial-gradient(var(--stars) 1px, transparent 1px);
      background-size: 20px 20px;
      opacity: 0;
      transition: opacity 2s;
      z-index: 0;
    }

body.dark .stars {
      opacity: 0.8;
    }

#toggleTheme {
      position: absolute;
      top: 20px;
      left: 20px;
      z-index: 3;
      padding: 10px 20px;
      font-size: 16px;
      background: #fff;
      border: none;
      border-radius: 8px;
      cursor: pointer;
      transition: background 0.3s;
    }

#toggleTheme:hover {
      background: #eee;
    }
  </style>
</head>
<body>
  <div class="scene">
    <div class="stars"></div>
    <div class="sun"></div>
    <div class="moon"></div>
    <div class="plane"></div>
    <button id="toggleTheme">Gece/Gündüz</button>
  </div>

CSS

JS

animación de avión

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