.boulders-container{position:absolute;top:0;left:0;right:0;margin:0 auto;pointer-events:none;z-index:2}.boulder{width:30px;height:30px;border-radius:50%;background-size:cover;background-position:50%;background-repeat:no-repeat}.boulder,.heart{position:absolute;opacity:.9}.heart{z-index:2}.camera-container{width:100%;height:100%;position:relative;border:2px solid #333;overflow:hidden;display:flex;justify-content:center;align-items:center;background-color:#000}.webcam-feed{width:100%;height:100%;object-fit:cover;display:block}.start-screen{position:absolute;top:0;left:0;right:0;bottom:0;display:flex;flex-direction:column;align-items:center;justify-content:center;background-color:rgba(0,0,0,.8);z-index:10}.start-screen h1{color:#fff;font-size:3rem;margin-bottom:1rem}.start-screen h2{color:#fff;font-size:1.5rem;margin-bottom:1.5rem;font-weight:400}.difficulty-select{display:flex;flex-direction:column;align-items:center;gap:1rem}.difficulty-buttons{display:flex;gap:1rem;flex-wrap:wrap;justify-content:center;max-width:600px}.difficulty-button{padding:1rem 2rem;font-size:1.2rem;border:none;border-radius:8px;color:#fff;cursor:pointer;transition:all .2s ease;text-transform:capitalize;min-width:120px}.difficulty-button:hover{transform:translateY(-2px);filter:brightness(110%);box-shadow:0 4px 8px rgba(0,0,0,.2)}.difficulty-button:active{transform:translateY(0);filter:brightness(90%);box-shadow:0 2px 4px rgba(0,0,0,.2)}.countdown-overlay{position:absolute;top:0;left:0;right:0;bottom:0;display:flex;justify-content:center;align-items:center;background-color:rgba(0,0,0,.7);z-index:15}.countdown-number{font-size:8rem;color:#fff;animation:pulse 1s ease-in-out infinite}@keyframes pulse{0%{transform:scale(1);opacity:1}50%{transform:scale(1.2);opacity:.8}to{transform:scale(1);opacity:1}}