Ejemplo de animación de carga CSS

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HTML

```html
<!DOCTYPE html>
<html lang="pt-BR">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Resposta</title>
    <style>
        /* Base de cores para os elementos */
        :root {
            --cor-primaria: #f92672;
            --cor-secundaria: #66d9ef;
            --cor-terciaria: #ae81ff;
        }

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

body {
            background: url("https://vinixodin.com/thumb.jpg") no-repeat center center;
            background-color: black;
            background-size: cover;
            display: flex;
            align-items: center;
            justify-content: center;
            height: 100vh;
            overflow: hidden;
        }

.codigo {
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            background: #272822;
            color: #F8F8F2;
            font-family: 'Consolas', 'Monaco', monospace;
            font-size: 18px;
            padding: 20px;
            border-radius: 8px;
            white-space: pre-line;
            text-align: left;
            line-height: 1.6;
            max-height: 25%;
            max-width: 75%;
            width: 75%;
            height: 25%;
            top:15%;
            overflow-y: hidden;
            box-shadow: -8px 10px 18px rgba(0, 0, 0, 0.55);
        }

.selector       { color: #F92672; }
        .property       { color: #66D9EF; }
        .value-number   { color: #AE81FF; }
        .value-string   { color: #E6DB74; }
        .value-color    { color: #A6E22E; }
        .function       { color: #A6E22E; }

/* Container da animação */
        .animation-container {
            position: absolute;
            top: 75%;
            left: 50%;
            transform: translate(-50%, -50%);
            display: flex;
            align-items: center;
            justify-content: center;
            width: 100%;
            height: 50%;
            overflow: hidden;
            background: transparent;
        }

/* Elemento principal da animação */
        .loading-element {
            border-radius: 50%;
            animation: loading-animation 1s linear infinite;
        }

@keyframes loading-animation {
            0% {
                transform: scale(0.5);
                top: 50%;
                left: 50%;
                opacity: 0;
            }

50% {
                transform: scale(1.2);
                top: 45%;
                left: 55%;
                opacity: 1;
            }

100% {
                transform: scale(0.5);
                top: 50%;
                left: 50%;
                opacity: 0;
            }
        }

/* Pseudo-elementos para criar sombras e efeitos */
        .loading-element::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: var(--cor-primaria);
            border-radius: 50%;
            transform: scale(1.2);
            animation: loading-shadow 1s linear infinite;
        }

@keyframes loading-shadow {
            0% {
                transform: scale(0.5) rotate(0deg);
            }

100% {
                transform: scale(0.5) rotate(360deg);
            }
        }

.loading-element::after {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: var(--cor-terciaria);
            border-radius: 50%;
            transform: scale(0.8);
            animation: loading-reflex 1s linear infinite;
        }

@keyframes loading-reflex {
            0% {
                transform: scale(1) rotate(0deg);
            }

100% {
                transform: scale(1) rotate(180deg);
            }
        }

/* Elemento de micro-detalhe */
        .micro-detail {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            background: var(--cor-secundaria);
            border-radius: 50%;
            width: 10px;
            height: 10px;
            animation: micro-detail-animation 1s linear infinite;
        }

@keyframes micro-detail-animation {
            0% {
                transform: translate(-50%, -50%);
                opacity: 0;
            }

50% {
                transform: translate(-50%, -50%) scale(1.3);
                opacity: 1;
            }

100% {
                transform: translate(-50%, -50%) scale(1);
                opacity: 0;
            }
        }

/* Exemplo de código */
        .codigo {
            <span class="selector">.loading-element</span><span class="brace">{</span>
            <span class="property">border-radius</span>: <span class="value-number">50%</span>;
            <span class="property">animation</span>: <span class="function">loading-animation</span> <span class="value-number">1s</span> <span class="value-string">linear</span> <span class="value-string">infinite</span>;
            <span class="property">animation</span>: <span class="function">loading-shadow</span> <span class="value-number">1s</span> <span class="value-string">linear</span> <span class="value-string">infinite</span>;
            <span class="brace">}</span>
        }
    </style>
</head>
<body>
    <div class="animation-container">
        <div class="loading-element" id="loading-element"></div>
        <div class="loading-element" id="loading-element-2"></div>
        <div class="loading-element" id="loading-element-3"></div>
        <div class="micro-detail" id="micro-detail"></div>
    </div>

</body>
</html>
```

CSS

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

body {
  background:url("./thumb.jpg") no-repeat center center;
  background-color: black;
  background-size: cover;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  overflow: hidden;
  aspect-ratio: 9/16;
}

.selector       { color: #F92672; }
.property       { color: #66D9EF; }
.value-number   { color: #AE81FF; }
.value-string   { color: #E6DB74; }
.value-color    { color: #A6E22E; }
.function       { color: #A6E22E; }

.animation-container {
  position: absolute;
  top: 75%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 50%;
  overflow: hidden;
  background: transparent;
  aspect-ratio: 9/16;
}

/* 
  Layers e motivação emocional
*/
.loading-element {
  background-color: #333333;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  animation: loading-animation 1s linear infinite;
  position: relative;
}

@keyframes loading-animation {
  0% {
    transform: scale(0);
  }
  100% {
    transform: scale(1);
  }
}

.layer1 {
  width: 100%;
  height: 100%;
  background-color: #4D4D4D;
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  transition: opacity 1s;
}

.layer1::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: #3F3F3F;
  width: 20px;
  height: 20px;
  border-radius: 50%;
}

/* 
  Micro-detalhes para o replay value
*/
.layer2 {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: #3F3F3F;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0);
  animation: detalhe 2s linear infinite;
}

@keyframes detalhe {
  50% {
    transform: scale(1);
    background-color: #666666;
  }
  100% {
    transform: scale(0);
    background-color: #3F3F3F;
  }
}

/* 
  Interações entre camadas e elementos
*/
.layer3 {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background-color: #2F2F2F;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation: interacao 2s linear infinite;
}

@keyframes interacao {
  50% {
    transform: scale(1);
    background-color: #777777;
  }
  100% {
    transform: scale(0);
    background-color: #2F2F2F;
  }
}