body{font-family:Arial,sans-serif;display:flex;justify-content:center;align-items:center;height:95vh;margin:0;background-color:#f0f0f0}#game-board{display:grid;grid-template-columns:repeat(10,20px);grid-template-rows:repeat(20,20px);gap:1px;background-color:#333}.cell{width:20px;height:20px;background-color:#444}#score-board{margin-left:0px;position:relative;padding:5px;min-height:200px}.game-over{visibility:hidden;opacity:0;transition:opacity 0.3s ease,visibility 0.3s}.game-over.show{visibility:visible;opacity:1;display:block!important}#start-button{padding:10px 20px;background-color:#4CAF50;color:white;border:none;border-radius:5px;cursor:pointer}#start-button:hover{background-color:#45a049}#game-main{margin-left:5px}#game-container{position:relative;display:flex;width:320px;height:420px;margin-bottom:10px;background-color:#fff;padding:5px;border-radius:10px;box-shadow:0 0 10px rgba(0,0,0,0.1);order:1}#help-info{position:absolute;bottom:10px;right:20px;background:rgba(0,0,0,0.7);padding:5px;margin-right:-15px;margin-bottom:-5px;border-radius:5px;color:#fff;font-size:12px;z-index:1;display:block}#help-info ul{margin:5px 0 0 15px;padding:0}#mobile-controls{order:2;display:grid;grid-template-columns:repeat(4,1fr);gap:8px;width:310px;max-width:310px;background:rgba(0,0,0,0.8);padding:10px;border-radius:12px}#hard-drop{grid-column:span 4;width:100%;height:55px;font-size:18px;margin-top:10px}.control-btn{display:flex;justify-content:center;align-items:center;border:2px solid#fff;border-radius:10px;background:#4CAF50;cursor:pointer;touch-action:manipulation;transition:opacity 0.2s;width:55px;height:55px;font-size:22px;color:#fff;margin:0 auto;-webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent}