CSS雷达动画

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html

css

:root {
  /* Colori */
  --g: #0f0;
  --bg-dots: #010;
  --bg-lines: #030;
  --bg-screen: #000100;
  --bg-light: #B3C7DD;
  --bg-dark: #6C7A88;
  --white-hi: #f1f1f1;
  --white-low: #9d9e9f;
  --base: #ffffff;
 
  /* Parametri */
  --dot-opacity: 0.5;
  --line-opacity: 0.25;
  --radial-opacity: 0.25;
  --trail-length: 90deg;
  --blend: color-dodge;
  --speed: 10s;
}

*,
*::after,
*::before {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Montserrat', sans-serif;
}
body {
  height: 100vh;
  width: 100vw;
  margin: 0;
 background-color: #1F1F1F;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  justify-content: center;
  align-items: center;
  transition: all .3s ease;
  
  &:has(input:checked) {
    --g: #f00;
    --bg-dots: #f00;
    --bg-lines: #700;
    --bg-screen: #100;
    --blend: darken;
    --trail-length: 210deg;
    --speed: 3s;
    
    #radar::after {
      content: '';
      backdrop-filter: blur(0.5px);
    }
  }
}

#radar {
  width: 75vmin;
  aspect-ratio: 1;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  background:
    linear-gradient(to bottom,
      var(--white-hi), var(--white-low));
  box-shadow: 
    inset 0 -3px 10px rgba(0,0,0,0.25),
    0 15px 18px rgba(0,0,0,0.5);
  border-radius: 50%;
  z-index: 2;
  
  &::before, &::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 90%;
    aspect-ratio: 1;
    border-radius:50%;
    transition: all .3s ease;
  }

&::before{
    z-index:-1;
    background-color: var(--bg-screen);
    background-image:
      linear-gradient(to bottom, 
        transparent calc(50%),
        hsl(from var(--bg-lines) h s l / var(--line-opacity)), 
        transparent calc(50% + 1px)),
      linear-gradient(to right, 
        transparent calc(50%),
        hsl(from var(--bg-lines) h s l / var(--line-opacity)),
        transparent calc(50% + 1px)),
      linear-gradient(45deg, 
        transparent calc(50%),
        hsl(from var(--bg-lines) h s l / var(--line-opacity)), 
        transparent calc(50% + 1px)),
      linear-gradient(-45deg, 
        transparent calc(50%),
        hsl(from var(--bg-lines) h s l / var(--line-opacity)), 
        transparent calc(50% + 1px)),
      repeating-radial-gradient(
        hsl(from var(--bg-lines) h s l / var(--radial-opacity)) 0,
        transparent 1px 2.5vmin, 
        hsl(from var(--bg-lines) h s l /  var(--radial-opacity)) calc(2.5vmin + 1px));
  }
  
  &::after {
    background-image: 
      conic-gradient(
        #000 var(--trail-length), var(--g) 360deg);
    mix-blend-mode: var(--blend);
    animation: rotate var(--speed) linear infinite;
  }
}

#targets {
  width: 90%;
  height: 90%;
  position: relative;
  border-radius: 50%;
  overflow: hidden;
  background:
      radial-gradient(circle at 65% 15%, var(--bg-dots), transparent 6px),
      radial-gradient(circle at 67% 19%, var(--bg-dots), transparent 4px),
      radial-gradient(circle at 68% 16%, var(--bg-dots), transparent 6px),
      radial-gradient(circle at 59% 63%, var(--bg-dots), transparent 5px),
      radial-gradient(circle at 55% 62%, var(--bg-dots), transparent 8px),
      radial-gradient(circle at 15% 36%, var(--bg-dots), transparent 6px),
      radial-gradient(circle at 19% 39%, var(--bg-dots), transparent 4px),
      radial-gradient(circle at 32% 70%, var(--bg-dots), transparent 6px),
      radial-gradient(circle at 28% 53%, var(--bg-dots), transparent 7px),
      radial-gradient(circle at 45% 92%, var(--bg-dots), transparent 8px),
      radial-gradient(circle at 85% 36%, var(--bg-dots), transparent 6px),
      radial-gradient(circle at 89% 45%, var(--bg-dots) 3px, transparent 5px),
      radial-gradient(circle at 78% 70%, var(--bg-dots) 4px, transparent 6px),
      radial-gradient(circle at 33% 85%, var(--bg-dots) 8px, transparent 10px);
  animation: move 120s infinite linear;
  background-position: 0 0;
  
  &::after, &::before {
    content: '';
    position: absolute;
    inset: 0;   
  }
  
  &::after {
    background:
      radial-gradient(circle at 10% 50%, var(--bg-dots), transparent 5px),
      radial-gradient(circle at 90% 50%, var(--bg-dots), transparent 5px),
      radial-gradient(circle at 60% 10%, var(--bg-dots), transparent 8px),
      radial-gradient(circle at 70% 90%, var(--bg-dots), transparent 5px);
    animation: move 200s infinite linear reverse, rotate 200s linear infinite;
  }
  
  &::before {
    background:
      radial-gradient(circle at 45% 50%, var(--bg-dots), transparent 4px),
      radial-gradient(circle at 49% 55%, var(--bg-dots), transparent 5px),
      radial-gradient(circle at 35% 35%, var(--bg-dots), transparent 6px),
      radial-gradient(circle at 45% 15%, var(--bg-dots), transparent 7px),
      radial-gradient(circle at 25% 35%, var(--bg-dots), transparent 8px);
    animation: move 600s infinite linear reverse, rotate 600s linear infinite;
  }
}

@keyframes rotate {
  to {transform: translate(-50%, -50%) rotate(1turn)}
}

@keyframes move {
  to {background-position: 0 67.5vmin;}
}

#selector {
  box-shadow: inset 0 2px 4px #0007;
  background: var(--bg-dark);
  cursor: pointer;
  width: 120px;
  height: 30px;
  display: block;
  position: relative;
  appearance: none;
  border-radius: 15px;
  
  &::before {
    content: 'Ver. 1';
    color: var(--bg-dark);
    font-weight: 700;
    font-size: 1rem;
    position: absolute;
    display: flex;
    justify-content: center;
    align-items: center;
    top: 0;
    left: 0;
    width: 60%;
    height: 100%;
    border-radius: inherit;
    background: 
      linear-gradient(to bottom,
      var(--white-hi), var(--white-low));
    transition: all .3s ease;
  }
  
  &:checked::before {
    content: 'Ver. 2';
    left: 40%;
  }
}

JavaScript

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