3D CSS function Animation | HTML, CSS & JavaScript

<div class="section">
  <div class="preview">
    <div class="title">3D Rotating Cube</div>
    <div class="cube">
      <div class="face front"></div>
      <div class="face back"></div>
      <div class="face right"></div>
      <div class="face left"></div>
      <div class="face top"></div>
      <div class="face bottom"></div>
    </div>
  </div>
</div>

<div class="section">
  <div class="preview">
    <div class="title">3D Flip Card (Tap)</div>
    <div class="card">
      <div class="inner">
        <div class="frontCard">Tap</div>
        <div class="backCard">Flip</div>
      </div>
    </div>
  </div>
</div>

<div class="section">
  <div class="preview">
    <div class="title">3D Depth Text</div>
    <div class="text3d">3D TEXT</div>
  </div>
</div>

<div class="section">
  <div class="preview">
    <div class="title">3D Tilt Effect</div>
    <div class="tilt">Touch</div>
  </div>
</div>

<div class="section">
  <div class="preview">
    <div class="title">3D Carousel</div>
    <div class="carousel">
      <div class="item">1</div>
      <div class="item">2</div>
      <div class="item">3</div>
      <div class="item">4</div>
    </div>
  </div>
</div>

body {
  margin: 0;
  font-family: sans-serif;
  background: #020617;
  color: #fff;
}

.section {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  border-bottom: 1px solid #222;
}

@media (min-width: 768px) {
  .section {
    flex-direction: row;
  }
}

/* TITLE */
.title {
  position: absolute;
  top: 10px;
  left: 20px;
  font-size: 18px;
  font-weight: bold;
  color: cyan;
}

/* CONTAINERS */
.preview, .code {
  flex: 1;
  position: relative;
  padding: 40px 20px 20px;
}

.preview {
  display: flex;
  justify-content: center;
  align-items: center;
  perspective: 1000px;
}

.code {
  background: #111;
  overflow: auto;
}

pre {
  color: #00ffcc;
  font-size: 13px;
  white-space: pre-wrap;
}

/* ---------- CUBE ---------- */
.cube {
  width: 100px;
  height: 100px;
  transform-style: preserve-3d;
  animation: spin 5s infinite linear;
  position: relative;
}
.face {
  position: absolute;
  width: 100px;
  height: 100px;
  background: cyan;
  opacity: 0.7;
  border: 1px solid #fff;
}
.front { transform: translateZ(50px); }
.back { transform: rotateY(180deg) translateZ(50px); }
.right { transform: rotateY(90deg) translateZ(50px); }
.left { transform: rotateY(-90deg) translateZ(50px); }
.top { transform: rotateX(90deg) translateZ(50px); }
.bottom { transform: rotateX(-90deg) translateZ(50px); }

@keyframes spin {
  to { transform: rotateX(360deg) rotateY(360deg); }
}

/* ---------- FLIP ---------- */
.card {
  width: 180px;
  height: 220px;
}
.inner {
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: 0.6s;
}
.card:active .inner {
  transform: rotateY(180deg);
}
.frontCard, .backCard {
  position: absolute;
  width: 100%;
  height: 100%;
  display:flex;
  justify-content:center;
  align-items:center;
  backface-visibility: hidden;
}
.frontCard { background: cyan; }
.backCard { background: magenta; transform: rotateY(180deg); }

/* ---------- TEXT ---------- */
.text3d {
  font-size: 40px;
  text-shadow: 3px 3px 0 #444;
  animation: pop 1s infinite alternate;
}
@keyframes pop {
  to { transform: translateZ(40px); }
}

/* ---------- TILT ---------- */
.tilt {
  width: 180px;
  height: 180px;
  background: linear-gradient(45deg, cyan, purple);
  display:flex;
  align-items:center;
  justify-content:center;
  transition: 0.3s;
}
.tilt:active {
  transform: rotateX(20deg) rotateY(20deg);
}

/* ---------- CAROUSEL ---------- */
.carousel {
  width: 150px;
  height: 150px;
  transform-style: preserve-3d;
  animation: rotate 8s infinite linear;
  position: relative;
}
.item {
  position: absolute;
  width: 100px;
  height: 120px;
  background: cyan;
  text-align:center;
  line-height:120px;
}
.item:nth-child(1){ transform: rotateY(0) translateZ(200px); }
.item:nth-child(2){ transform: rotateY(90deg) translateZ(200px); }
.item:nth-child(3){ transform: rotateY(180deg) translateZ(200px); }
.item:nth-child(4){ transform: rotateY(270deg) translateZ(200px); }

@keyframes rotate {
  to { transform: rotateY(360deg); }
}

let currentMethod = 'phone';
        const DEMO_CODE = "246810";

function setMethod(method) {
            currentMethod = method;
            document.querySelectorAll('.method-btn').forEach(btn => btn.classList.remove('active'));
            event.target.classList.add('active');

document.getElementById('phoneField').style.display = method === 'phone' ? 'block' : 'none';
            document.getElementById('emailField').style.display = method === 'email' ? 'block' : 'none';
        }

function sendCode() {
            const target = currentMethod === 'phone' ?
                document.getElementById('phoneInput').value :
                document.getElementById('emailInput').value;

if (!target) return;

document.getElementById('displayTarget').innerText = target;
            document.getElementById('step1').classList.remove('active');
            document.getElementById('step2').classList.add('active');
            document.querySelectorAll('.otp-input')[0].focus();
        }

function moveNext(el, index) {
            const inputs = document.querySelectorAll('.otp-input');
            if (el.value && index < 5) {
                inputs[index + 1].focus();
            }
        }

function verifyCode() {
            const inputs = document.querySelectorAll('.otp-input');
            let code = "";
            inputs.forEach(input => code += input.value);

if (code === DEMO_CODE) {
                document.getElementById('step2').classList.remove('active');
                document.getElementById('step3').classList.add('active');
            } else {
                document.getElementById('errorCode').style.display = 'block';
                inputs.forEach(input => {
                    input.value = "";
                    input.style.borderColor = "#ff5f5f";
                });
                inputs[0].focus();
            }
        }

function goBack() {
            document.getElementById('step2').classList.remove('active');
            document.getElementById('step1').classList.add('active');
            document.getElementById('errorCode').style.display = 'none';
        }

- 3D CSS function Animation

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