CSS 3D Transforms

/* 3D Card Flip */
.flip-container {
    perspective: 1000px;  /* distance from viewer - creates depth */
    width: 300px;
    height: 200px;
}

.flip-card {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;  /* children maintain 3D position */
    transition: transform 0.6s ease;
}

.flip-container:hover .flip-card {
    transform: rotateY(180deg);  /* flip on hover */
}

.flip-front,
.flip-back {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;  /* hide when facing away */
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: bold;
}

.flip-front {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
}

.flip-back {
    background: linear-gradient(135deg, #f093fb, #f5576c);
    color: white;
    transform: rotateY(180deg);  /* pre-rotated - starts facing away */
}

/* 3D Cube */
.scene {
    perspective: 600px;
    width: 100px;
    height: 100px;
}
.cube {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    animation: rotateCube 4s linear infinite;
}
.face {
    position: absolute;
    width: 100px;
    height: 100px;
    border: 2px solid rgba(255,255,255,0.3);
    background: rgba(52,152,219,0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
}
.front  { transform: translateZ(50px); }
.back   { transform: rotateY(180deg) translateZ(50px); }
.left   { transform: rotateY(-90deg) translateZ(50px); }
.right  { transform: rotateY(90deg) translateZ(50px); }
.top    { transform: rotateX(90deg) translateZ(50px); }
.bottom { transform: rotateX(-90deg) translateZ(50px); }

@keyframes rotateCube {
    from { transform: rotateX(0) rotateY(0); }
    to   { transform: rotateX(360deg) rotateY(360deg); }
}