*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;margin:0;min-height:100vh;background:#faf8ef}#root{min-height:100vh}.game-container{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;max-width:500px;margin:0 auto;padding:30px;text-align:center;background:#fffffff2;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:20px;box-shadow:0 20px 40px #0000001a,0 6px 12px #0000000d;border:1px solid rgba(255,255,255,.2)}.game-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.game-header h1{font-size:48px;font-weight:900;background:linear-gradient(135deg,#667eea,#764ba2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin:0;text-shadow:0 2px 4px rgba(0,0,0,.1)}.score-container{display:flex;gap:10px;align-items:center}.score-box{background:linear-gradient(135deg,#667eea,#764ba2);padding:15px 25px;border-radius:12px;color:#fff;min-width:80px;box-shadow:0 4px 15px #667eea4d;transition:transform .2s ease,box-shadow .2s ease}.score-box:hover{transform:translateY(-2px);box-shadow:0 6px 20px #667eea66}.score-label{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:1px}.score-value{font-size:24px;font-weight:700;margin-top:5px}.restart-button{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;padding:15px 25px;border-radius:12px;font-size:14px;font-weight:700;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 15px #667eea4d}.restart-button:hover{transform:translateY(-2px);box-shadow:0 6px 20px #667eea66;background:linear-gradient(135deg,#5a6fd8,#6a4190)}.game-board{position:relative;background:linear-gradient(135deg,#f0f2f5,#e8ebf0);border-radius:16px;padding:15px;display:grid;grid-template-columns:repeat(4,1fr);grid-template-rows:repeat(4,1fr);gap:12px;width:400px;height:400px;margin:20px auto;box-shadow:inset 0 2px 10px #0000001a,0 4px 20px #0000000d;border:1px solid rgba(255,255,255,.3)}.tile{position:relative;background:#fff6;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:32px;font-weight:700;transition:all .3s cubic-bezier(.25,.46,.45,.94);color:#2d3748;border:1px solid rgba(255,255,255,.5);-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}@keyframes tileAppear{0%{transform:scale(0);opacity:0}50%{transform:scale(1.1)}to{transform:scale(1);opacity:1}}.tile:not(:empty){animation:tileAppear .3s ease-out}.tile-2{background:linear-gradient(135deg,#ff9a9e,#fecfef);color:#2d3748;box-shadow:0 4px 15px #ff9a9e4d}.tile-4{background:linear-gradient(135deg,#a8edea,#fed6e3);color:#2d3748;box-shadow:0 4px 15px #a8edea4d}.tile-8{background:linear-gradient(135deg,#ffecd2,#fcb69f);color:#2d3748;box-shadow:0 4px 15px #fcb69f66}.tile-16{background:linear-gradient(135deg,#a8e6cf,#dcedc8);color:#2d3748;box-shadow:0 4px 15px #a8e6cf66}.tile-32{background:linear-gradient(135deg,#ffd3a5,#fd9853);color:#2d3748;box-shadow:0 4px 15px #fd985366}.tile-64{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;box-shadow:0 4px 15px #667eea66}.tile-128{background:linear-gradient(135deg,#f093fb,#f5576c);color:#fff;font-size:28px;box-shadow:0 6px 20px #f093fb66}.tile-256{background:linear-gradient(135deg,#4facfe,#00f2fe);color:#fff;font-size:28px;box-shadow:0 6px 20px #4facfe66}.tile-512{background:linear-gradient(135deg,#43e97b,#38f9d7);color:#fff;font-size:28px;box-shadow:0 6px 20px #43e97b66}.tile-1024{background:linear-gradient(135deg,#fa709a,#fee140);color:#fff;font-size:24px;box-shadow:0 8px 25px #fa709a80}.tile-2048{background:linear-gradient(135deg,#ff6b6b,#feca57);color:#fff;font-size:24px;box-shadow:0 8px 30px #ff6b6b99;animation:pulse 2s ease-in-out infinite}@keyframes pulse{0%{transform:scale(1)}50%{transform:scale(1.05)}to{transform:scale(1)}}.tile-4096{background:linear-gradient(135deg,#2c3e50,#4a6741);color:#fff;font-size:20px;box-shadow:0 8px 30px #2c3e5099}.game-message{position:fixed;top:0;left:0;width:100%;height:100%;background:#0009;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);display:flex;align-items:center;justify-content:center;z-index:1000;animation:fadeIn .3s ease-out}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.message-content{background:#fffffff2;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);padding:50px;border-radius:20px;box-shadow:0 20px 40px #0003;text-align:center;border:1px solid rgba(255,255,255,.3);animation:slideUp .3s ease-out}@keyframes slideUp{0%{transform:translateY(30px);opacity:0}to{transform:translateY(0);opacity:1}}.message-content h2{background:linear-gradient(135deg,#667eea,#764ba2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin:0 0 20px;font-size:32px;font-weight:900}.message-content p{color:#4a5568;margin:10px 0 30px;font-size:18px}.message-content button{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;padding:15px 30px;border-radius:12px;font-size:16px;font-weight:700;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 15px #667eea4d}.message-content button:hover{transform:translateY(-2px);box-shadow:0 6px 20px #667eea66;background:linear-gradient(135deg,#5a6fd8,#6a4190)}.game-instructions{margin-top:25px;color:#4a5568;font-size:16px;background:#ffffffb3;padding:15px;border-radius:12px;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);border:1px solid rgba(255,255,255,.3)}.game-instructions p{margin:0;font-weight:500}@media (max-width: 520px){.game-container{padding:20px;margin:10px}.game-header{flex-direction:column;gap:15px}.game-header h1{font-size:36px}.game-board{width:300px;height:300px;padding:12px;gap:8px}.tile{font-size:24px;border-radius:8px}.tile-128,.tile-256,.tile-512{font-size:20px}.tile-1024,.tile-2048{font-size:18px}.tile-4096{font-size:16px}.message-content{margin:20px;padding:30px}.message-content h2{font-size:24px}}.tile:not(:empty):hover{transform:scale(1.05);z-index:1}.tile-1024,.tile-2048,.tile-4096{position:relative;overflow:hidden}.tile-1024:before,.tile-2048:before,.tile-4096:before{content:"";position:absolute;top:-50%;left:-50%;width:200%;height:200%;background:linear-gradient(45deg,transparent,rgba(255,255,255,.1),transparent);animation:shine 2s ease-in-out infinite}@keyframes shine{0%{transform:translate(-100%) translateY(-100%) rotate(45deg)}50%{transform:translate(100%) translateY(100%) rotate(45deg)}to{transform:translate(-100%) translateY(-100%) rotate(45deg)}}.app{min-height:100vh;background:linear-gradient(135deg,#667eea,#764ba2);background-attachment:fixed;display:flex;align-items:center;justify-content:center;padding:20px;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif}