.pfs-deck-container { max-width: 600px; margin: 20px auto; text-align: center; font-family: sans-serif; }
.pfs-cards-wrapper { perspective: 1000px; margin-bottom: 20px; height: 300px; }
.pfs-card-single {
    width: 100%; height: 100%; position: absolute; left: 0; top: 0;
    transition: transform 0.6s; transform-style: preserve-3d;
    opacity: 0; pointer-events: none;
}
.pfs-card-single.is-visible { opacity: 1; pointer-events: auto; position: relative; }
.pfs-card-inner { width: 100%; height: 100%; position: relative; transition: transform 0.6s; transform-style: preserve-3d; }
.pfs-card-single.is-flipped .pfs-card-inner { transform: rotateY(180deg); }
.pfs-card-face {
    position: absolute; width: 100%; height: 100%; backface-visibility: hidden;
    border: 1px solid #ddd; border-radius: 8px; background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1); display: flex; align-items: center;
    justify-content: center; padding: 20px; box-sizing: border-box; font-size: 1.2em;
}
.pfs-card-back { transform: rotateY(180deg); background: #f7f7f7; }
.pfs-controls .pfs-btn { padding: 10px 20px; margin: 0 5px; cursor: pointer; background: #0073aa; color: #fff; border: none; border-radius: 4px; }
.pfs-nav-info { margin-bottom: 10px; font-weight: bold; color: #555; }