website/src/components/AnimatedStars.astro at a7e2d6d773737948f67cbe677d3459010dc05725 · EuroPython/website · GitHub

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---
// Animated starfield background component
// Creates a twinkling star effect with two layers of stars
// that move, scale, rotate, and change opacity
---

<div class="animated-stars">
  <slot />
</div>

<style>
  .animated-stars {
    position: relative;
    width: 100%;
    min-height: 100vh;
  }

  .animated-stars::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
      radial-gradient(1px 1px at 10% 20%, white, transparent),
      radial-gradient(1px 1px at 30% 40%, white, transparent),
      radial-gradient(1px 1px at 50% 60%, white, transparent),
      radial-gradient(1px 1px at 70% 30%, white, transparent),
      radial-gradient(1px 1px at 90% 80%, white, transparent),
      radial-gradient(1px 1px at 15% 70%, white, transparent),
      radial-gradient(1px 1px at 40% 15%, white, transparent),
      radial-gradient(1px 1px at 60% 85%, white, transparent),
      radial-gradient(1px 1px at 85% 50%, white, transparent),
      radial-gradient(1px 1px at 25% 90%, white, transparent);
    background-size:
      200px 200px,
      250px 250px,
      300px 300px,
      180px 180px,
      220px 220px,
      280px 280px,
      240px 240px,
      260px 260px,
      290px 290px,
      210px 210px;
    background-position:
      0 0,
      40px 60px,
      130px 270px,
      70px 100px,
      220px 180px,
      300px 320px,
      150px 80px,
      280px 380px,
      100px 200px,
      350px 250px;
    background-repeat: repeat;
    animation: twinkle1 45s ease-in-out infinite;
    pointer-events: none;
    z-index: 0;
  }

  .animated-stars::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
      radial-gradient(2px 2px at 20% 15%, rgba(255,255,255,0.8), transparent),
      radial-gradient(1px 1px at 45% 35%, white, transparent),
      radial-gradient(1px 1px at 65% 55%, rgba(255,255,255,0.7), transparent),
      radial-gradient(2px 2px at 80% 25%, white, transparent),
      radial-gradient(1px 1px at 35% 75%, rgba(255,255,255,0.9), transparent),
      radial-gradient(1px 1px at 55% 45%, white, transparent);
    background-size:
      300px 300px,
      200px 200px,
      250px 250px,
      280px 280px,
      220px 220px,
      240px 240px;
    background-position:
      0 0,
      50px 80px,
      100px 150px,
      200px 50px,
      150px 200px,
      250px 100px;
    background-repeat: repeat;
    animation: twinkle2 60s ease-in-out infinite;
    pointer-events: none;
    z-index: 0;
  }

  .animated-stars > :global(*) {
    position: relative;
    z-index: 1;
  }

  @keyframes twinkle1 {
    0% {
      opacity: 1;
      transform: translate(0, 0) scale(1);
    }
    15% {
      opacity: 0.4;
      transform: translate(25px, -15px) scale(1.1);
    }
    30% {
      opacity: 0.8;
      transform: translate(-20px, 30px) scale(0.9);
    }
    45% {
      opacity: 0.3;
      transform: translate(30px, 20px) scale(1.05);
    }
    60% {
      opacity: 0.9;
      transform: translate(-25px, -25px) scale(0.95);
    }
    75% {
      opacity: 0.5;
      transform: translate(15px, 35px) scale(1.08);
    }
    90% {
      opacity: 0.7;
      transform: translate(-30px, -10px) scale(0.92);
    }
    100% {
      opacity: 1;
      transform: translate(0, 0) scale(1);
    }
  }

  @keyframes twinkle2 {
    0% {
      opacity: 0.8;
      transform: translate(0, 0) rotate(0deg);
    }
    20% {
      opacity: 0.3;
      transform: translate(-30px, 20px) rotate(5deg);
    }
    35% {
      opacity: 0.9;
      transform: translate(25px, -25px) rotate(-3deg);
    }
    50% {
      opacity: 0.4;
      transform: translate(-15px, -30px) rotate(7deg);
    }
    65% {
      opacity: 0.7;
      transform: translate(35px, 15px) rotate(-5deg);
    }
    80% {
      opacity: 0.5;
      transform: translate(-20px, 28px) rotate(4deg);
    }
    100% {
      opacity: 0.8;
      transform: translate(0, 0) rotate(0deg);
    }
  }

  @media (prefers-reduced-motion: reduce) {
    .animated-stars::before,
    .animated-stars::after {
      animation: none;
    }
  }
</style>