#starting-solids-guide-wrapper .flip-card.flipped .flip-card-inner{transform:rotateY(180deg)}#starting-solids-guide-wrapper .progress-bar{width:100%;height:30px;background:#fff;border-radius:15px;overflow:hidden;box-shadow:inset 0 2px 5px rgba(0,0,0,.1)}#starting-solids-guide-wrapper .progress-fill{height:100%;background:linear-gradient(90deg,#56ab2f 0%,#a8e063 100%);transition:width .5s ease;display:flex;align-items:center;justify-content:center;color:white;font-weight:700}