*{margin:0;padding:0;box-sizing:border-box}:root{--primary:#9c27b0;--secondary:#e91e63;--bg-dark:#1a1a2e;--bg-darker:#16213e}body{font-family:Poppins,-apple-system,BlinkMacSystemFont,sans-serif;background:linear-gradient(135deg,var(--bg-dark) 0,var(--bg-darker) 100%);min-height:100vh;color:#fff;display:flex;justify-content:center;align-items:center}.container{text-align:center;padding:2rem}h1{font-size:2.5rem;background:linear-gradient(135deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:.5rem}.subtitle{color:#888}.stats,.subtitle{margin-bottom:2rem}.stats{display:flex;justify-content:center;gap:2rem;flex-wrap:wrap}.stat{background:hsla(0,0%,100%,.1);padding:.5rem 1.5rem;border-radius:20px}.puzzle-grid{display:inline-grid;gap:8px;background:rgba(0,0,0,.3);padding:16px;border-radius:16px;margin-bottom:2rem}.tile{width:80px;height:80px;background:linear-gradient(135deg,var(--primary),var(--secondary));border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:2rem;font-weight:700;cursor:pointer;transition:transform .15s,opacity .15s;-webkit-user-select:none;-moz-user-select:none;user-select:none}.tile:hover{transform:scale(1.05)}.tile.empty{background:hsla(0,0%,100%,.05);cursor:default}.tile.empty:hover{transform:none}.actions{display:flex;justify-content:center;gap:1rem;flex-wrap:wrap}.btn{padding:.75rem 2rem;font-size:1rem;border:none;border-radius:25px;cursor:pointer;transition:transform .2s}.btn-primary{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff}.btn-secondary{background:hsla(0,0%,100%,.1);color:#fff}.btn:hover{transform:scale(1.05)}.message{margin-top:1.5rem;padding:1rem;color:#888;font-size:1.1rem}.win-message{color:#4caf50;font-size:1.5rem;font-weight:700}.difficulty{margin-bottom:1.5rem}.difficulty button{margin:0 .5rem;padding:.5rem 1rem;background:hsla(0,0%,100%,.1);border:none;color:#fff;border-radius:15px;cursor:pointer}.difficulty button.active{background:linear-gradient(135deg,var(--primary),var(--secondary))}.login-overlay{position:fixed;inset:0;background:rgba(0,0,0,.9);display:flex;justify-content:center;align-items:center;z-index:100}.login-box{background:#1a1a2e;padding:2rem;border-radius:16px;text-align:center;max-width:400px}.login-box input{width:100%;padding:.75rem;margin:.5rem 0;border:1px solid #333;border-radius:8px;background:#0a0a1a;color:#fff}.leaderboard{margin-top:2rem;padding:1rem;background:hsla(0,0%,100%,.05);border-radius:12px}.leaderboard h3{text-align:center;margin-bottom:1rem;color:var(--secondary)}.leaderboard-entry{padding:.5rem;border-bottom:1px solid #333}.header-row,.leaderboard-entry{display:flex;justify-content:space-between}.header-row{align-items:center;margin-bottom:.5rem}.header-actions{display:flex;gap:.5rem;align-items:center}.premium-badge{background:linear-gradient(135deg,gold,orange);color:#000;padding:.25rem .75rem;border-radius:12px;font-size:.8rem;font-weight:700}.btn-small{padding:.4rem 1rem;font-size:.8rem}.btn-premium{background:linear-gradient(135deg,gold,orange);color:#000;border:none;border-radius:25px;cursor:pointer;transition:transform .2s}.lock-icon{margin-left:.25rem;font-size:.7rem}.paywall-overlay{position:fixed;inset:0;background:rgba(0,0,0,.85);display:flex;justify-content:center;align-items:center;z-index:200}.paywall-modal{background:#1a1a2e;padding:2rem;border-radius:16px;text-align:center;max-width:400px;border:2px solid gold}.paywall-modal h2{margin-bottom:1rem;color:gold}.paywall-modal p{margin-bottom:1.5rem;color:#ccc;font-size:1.1rem}.premium-features{list-style:none;text-align:left;margin:1rem 0;padding:0 1rem}.premium-features li{padding:.5rem 0;color:#fff;font-size:1rem}.premium-price{font-size:2.5rem;font-weight:700;color:#4caf50;margin:1rem 0}