Webleb - UI Elements - depth illusion

HTML

CSS

body {
 margin: 0;
 height: 100vh;
 display: flex;
 justify-content: center;
 align-items: center;
 background: #000;
 overflow: hidden;
}
/*cena com perspectiva */
.scene {
 position: relative;
 width: 100%;
 height: 100%;
 perspective: 1000px;
 perspective-origin: 50% 50%;
}
/*estilo comum dos paineis com posicao inicial no eixo z */
.panel {
 position: absolute;
 top: 50%;
 left: 50%;
 width: 350px;
 height: 100px;
 background: linear-gradient(
   to bottom,
   rgba(147, 112, 219, 0.6) 0%, 
   rgba(106, 90, 205, 0.5) 50%, 
   rgba(75, 0, 130, 0.4) 100%
   );
 border: 2px solid rgba(147, 112, 219, 0.8);  
 border-radius: 20px;
 transform: translate(-50%, -50%) translateZ(-1000px) rotateX(15deg); 
 opacity: 0;
 animation: approach 4s cubic-bezier(0.25, 0.1, 0.25, 1) forwards;
 animation-delay: calc(var(--delay) * 1s);
    box-shadow: 
    0 15px 25px rgba(147, 112, 219, 0.15);
    background-blend-mode: overlay;
   }
   /*delay para cada painel */
 .panel:nth-child(1) {
    --delay: 1;
      width: 350px;
      height: 100px;
     }

.panel:nth-child(2) {
      --delay: 2;
        width: 300px;
        height: 85px;
       }

.panel:nth-child(3) {
        --delay: 3;
          width: 250px;
          height: 70px;
         }

.panel:nth-child(4) {
          --delay: 4;
            width: 200px;
            height: 55px;
           }
           /*animacao */
           @keyframes approach {
            0% {
             opacity: 0;
             transform: translate(-50%, -50%) translateZ(-1000px) rotateX(15deg);
             box-shadow: 0 15px 25px rgba(147, 112, 219, 0.15);
            }
            50% {
             opacity: 0.7;
             transform: translate(-50%, -50%) translateZ(-500px) rotateX(7deg);
             box-shadow: 0 20px 30px rgba(147, 112, 219, 0.25);
            }
            100% {
             opacity: 1;
             transform: translate(-50%, -50%) translateZ(calc(var(--z) * 1px)) rotateX(0deg); /* Posição final no eixo Z */
                box-shadow: 0 25px 35px rgba(147, 112, 219, 0.3); /* Sombra final realista */
               }
              }
              /*translateZ para cada 1 */
              .panel:nth-child(1) { --z: 200; }
                .panel:nth-child(2) { --z: 100; }
                  .panel:nth-child(3) { --z: 0; }
                    .panel:nth-child(4) { --z: -100; }

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