:root{--primary: #ff8a65;--primary-light: #ffbb93;--secondary: #4db6ac;--accent: #ffd54f;--bg: #0d0d0d;--card-bg: rgba(30, 30, 30, .8);--text: #e0e0e0}*{box-sizing:border-box;margin:0;padding:0;font-family:Pretendard,-apple-system,BlinkMacSystemFont,system-ui,Roboto,sans-serif}body{background:var(--bg);background-image:radial-gradient(circle at 20% 20%,rgba(255,138,101,.05) 0%,transparent 40%),radial-gradient(circle at 80% 80%,rgba(77,182,172,.05) 0%,transparent 40%);color:var(--text);min-height:100vh;display:flex;justify-content:center;align-items:center;overflow-x:hidden}#root{width:100%;max-width:600px;padding:20px}.game-container{background:var(--card-bg);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-radius:32px;padding:40px;box-shadow:0 25px 50px #0009;text-align:center;border:1px solid rgba(255,255,255,.1)}h1{font-size:1.8rem;margin-bottom:25px;color:#fff;line-height:1.2}h1 span{font-size:1rem;color:var(--primary-light);font-weight:400;display:block;margin-top:5px}.difficulty-selector{display:flex;justify-content:center;gap:12px;margin-bottom:30px;flex-wrap:wrap}.btn{padding:12px 24px;border:none;border-radius:14px;background:#2a2a2a;color:#aaa;cursor:pointer;transition:all .3s cubic-bezier(.4,0,.2,1);box-shadow:0 4px 6px #0003;font-weight:600}.btn:hover{background:#3a3a3a;color:#fff;transform:translateY(-2px);box-shadow:0 8px 15px #0006}.btn.active{background:linear-gradient(135deg,var(--primary),#ff7043);color:#fff;box-shadow:0 8px 20px #ff8a6566}.puzzle-board{display:grid;gap:6px;background:#1a1a1a;padding:12px;border-radius:20px;position:relative;aspect-ratio:1 / 1;margin:0 auto;max-width:480px;box-shadow:inset 0 0 30px #000c,0 10px 30px #00000080;border:1px solid rgba(255,255,255,.05)}.tile{cursor:pointer;border-radius:10px;transition:all .2s cubic-bezier(.4,0,.2,1);border:1px solid rgba(255,255,255,.05);box-shadow:2px 2px 5px #0000004d}.tile:hover{filter:brightness(1.2) contrast(1.1);z-index:10;transform:scale(1.03);box-shadow:0 10px 20px #00000080}.tile.empty{background:#0a0a0a;cursor:default;border:none;box-shadow:inset 2px 2px 10px #00000080;opacity:.3}.stats{margin:25px 0;display:flex;justify-content:space-around;font-weight:600;font-size:1.1rem;color:var(--primary-light);background:#ffffff08;padding:15px;border-radius:16px}.controls{margin-top:30px;display:flex;gap:15px;justify-content:center}.success-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#000000e6;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);display:flex;flex-direction:column;justify-content:center;align-items:center;z-index:1000;color:#fff;animation:fadeIn .5s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.success-image{max-width:80%;max-height:60%;border-radius:24px;box-shadow:0 0 60px var(--primary);margin-bottom:25px;border:2px solid rgba(255,255,255,.2)}h2{font-size:1.8rem;margin-bottom:10px;color:var(--accent)}p{font-size:1.2rem;opacity:.9}