:root{--bg:#0f172a;--bg-card:#1e293b;--bg-cell:#1e293b;--bg-cell-hover:#334155;--bg-cell-selected:#3b82f6;--bg-cell-highlight:#1e3a5f;--bg-cell-clue:#263548;--bg-conflict:#7f1d1d;--text:#f1f5f9;--text-muted:#94a3b8;--text-clue:#e2e8f0;--text-player:#60a5fa;--border:#334155;--border-thick:#64748b;--accent:#3b82f6;--accent-hover:#2563eb;--success:#22c55e;--danger:#ef4444;--warning:#f59e0b;color:var(--text);background:var(--bg);font-family:Inter,system-ui,-apple-system,sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{justify-content:center;min-height:100vh;display:flex}#root{width:100%;max-width:900px;padding:1rem}.board{background:var(--border);border:2px solid var(--border-thick);aspect-ratio:1;-webkit-user-select:none;user-select:none;border-radius:8px;grid-template-rows:repeat(9,1fr);grid-template-columns:repeat(9,1fr);gap:1px;max-width:500px;margin:0 auto;display:grid;overflow:hidden}.cell{background:var(--bg-cell);cursor:pointer;justify-content:center;align-items:center;font-size:1.4rem;font-weight:600;transition:background .1s;display:flex;position:relative}.cell:hover{background:var(--bg-cell-hover)}.cell.selected{background:var(--bg-cell-selected);color:#fff}.cell.highlighted{background:var(--bg-cell-highlight)}.cell.clue{color:var(--text-clue);background:var(--bg-cell-clue)}.cell.clue.highlighted{background:#2a4a6b}.cell.player-value{color:var(--text-player)}.cell.conflict{background:var(--bg-conflict);color:#fca5a5}.cell.selected.conflict{background:#991b1b}.cell.box-right{border-right:2px solid var(--border-thick)}.cell.box-bottom{border-bottom:2px solid var(--border-thick)}.numpad{grid-template-columns:repeat(5,1fr);gap:.5rem;max-width:500px;margin:1rem auto 0;display:grid}.numpad button{border:1px solid var(--border);background:var(--bg-card);color:var(--text);cursor:pointer;border-radius:8px;padding:.75rem;font-size:1.2rem;font-weight:600;transition:background .15s}.numpad button:hover{background:var(--bg-cell-hover)}.numpad button:active{background:var(--accent)}.numpad button.erase{background:#7f1d1d;border-color:#991b1b}.numpad button.erase:hover{background:#991b1b}.timer{font-variant-numeric:tabular-nums;color:var(--text);font-size:1.5rem;font-weight:700}.difficulty-badge{text-transform:uppercase;letter-spacing:.05em;border-radius:999px;padding:.25rem .75rem;font-size:.8rem;font-weight:600}.difficulty-badge.easy{color:#bbf7d0;background:#166534}.difficulty-badge.medium{color:#fef08a;background:#854d0e}.difficulty-badge.hard{color:#fed7aa;background:#9a3412}.difficulty-badge.expert{color:#fecaca;background:#7f1d1d}.game-actions{gap:.5rem;max-width:500px;margin:.75rem auto 0;display:flex}.game-actions button{border:1px solid var(--border);background:var(--bg-card);color:var(--text);cursor:pointer;border-radius:8px;flex:1;padding:.6rem;font-size:.85rem;font-weight:600;transition:background .15s}.game-actions button:hover{background:var(--bg-cell-hover)}.game-actions button:disabled{opacity:.4;cursor:not-allowed}.page{padding:2rem 0}.page h1{text-align:center;margin-bottom:1.5rem;font-size:2rem}.page h2{color:var(--text-muted);margin-bottom:1rem;font-size:1.3rem}.menu{flex-direction:column;align-items:center;gap:1rem;padding:3rem 0;display:flex}.menu h1{background:linear-gradient(135deg,#3b82f6,#8b5cf6);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;margin-bottom:.5rem;font-size:3rem;font-weight:800}.menu p{color:var(--text-muted);margin-bottom:1rem}.menu-buttons{flex-direction:column;gap:1rem;width:100%;max-width:320px;display:flex}.btn-large{border-radius:12px;padding:1rem 2rem;font-size:1.2rem}.btn{cursor:pointer;border:none;border-radius:8px;padding:.7rem 1.5rem;font-size:.9rem;font-weight:600;transition:background .15s}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover)}.btn-secondary{background:var(--bg-card);color:var(--text);border:1px solid var(--border)}.btn-secondary:hover{background:var(--bg-cell-hover)}.btn-google{color:#333;cursor:pointer;background:#fff;border:none;border-radius:8px;align-items:center;gap:.5rem;padding:.7rem 1.5rem;font-weight:600;display:flex}.btn-google:hover{background:#f1f1f1}.nav{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;margin-bottom:1rem;padding:.75rem 0;display:flex}.nav-links{gap:1rem;display:flex}.nav-links a{color:var(--text-muted);font-size:.9rem;font-weight:500;text-decoration:none;transition:color .15s}.nav-links a:hover,.nav-links a.active{color:var(--text)}.nav-user{color:var(--text-muted);align-items:center;gap:.75rem;font-size:.85rem;display:flex}.leaderboard-tabs{border:1px solid var(--border);border-radius:8px;gap:0;margin-bottom:1.5rem;display:flex;overflow:hidden}.leaderboard-tabs button{background:var(--bg-card);color:var(--text-muted);cursor:pointer;border:none;flex:1;padding:.6rem;font-size:.85rem;font-weight:600;transition:all .15s}.leaderboard-tabs button.active{background:var(--accent);color:#fff}.score-table{border-collapse:collapse;width:100%}.score-table th,.score-table td{text-align:left;border-bottom:1px solid var(--border);padding:.6rem .75rem}.score-table th{color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;font-size:.8rem;font-weight:600}.score-table tr:hover td{background:var(--bg-card)}.rank-1{color:#fbbf24;font-weight:700}.rank-2{color:#d1d5db;font-weight:700}.rank-3{color:#d97706;font-weight:700}.modal-overlay{z-index:100;background:#000000b3;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.modal{background:var(--bg-card);border:1px solid var(--border);text-align:center;border-radius:16px;width:90%;max-width:380px;padding:2rem}.modal h2{color:var(--success);margin-bottom:1rem;font-size:1.5rem}.modal .score-display{color:var(--accent);margin:.5rem 0;font-size:3rem;font-weight:800}.modal .stats{color:var(--text-muted);justify-content:center;gap:1.5rem;margin:1rem 0;font-size:.9rem;display:flex}.modal .stats strong{color:var(--text);font-size:1.1rem;display:block}.modal .actions{gap:.5rem;margin-top:1.5rem;display:flex}.modal .actions button{flex:1}.group-card{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;margin-bottom:.75rem;padding:1rem}.group-card h3{margin-bottom:.25rem;font-size:1rem}.group-card .code{color:var(--accent);font-family:monospace;font-size:.9rem}.group-card .members{color:var(--text-muted);font-size:.8rem}.inline-form{gap:.5rem;margin-bottom:1rem;display:flex}.inline-form input{background:var(--bg);border:1px solid var(--border);color:var(--text);border-radius:8px;flex:1;padding:.6rem .75rem;font-size:.9rem}.inline-form input::placeholder{color:var(--text-muted)}.loading{text-align:center;color:var(--text-muted);padding:3rem}.spinner{border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;width:32px;height:32px;margin:0 auto 1rem;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.lives{gap:.2rem;font-size:1.1rem;display:flex}.heart.active{color:var(--danger)}.heart.dead{color:var(--border)}.level-badge{background:var(--accent);color:#fff;border-radius:999px;padding:.25rem .6rem;font-size:.8rem;font-weight:700}.game-header{justify-content:space-between;align-items:center;gap:.5rem;max-width:500px;margin:0 auto;padding:.75rem 0;display:flex}.header-left,.header-right{align-items:center;gap:.5rem;display:flex}.total-score{color:var(--accent);font-size:.8rem;font-weight:600}.tutorial-page{max-width:640px;margin:0 auto}.video-container{background:var(--bg-card);border-radius:12px;width:100%;margin:1.5rem 0;padding-bottom:56.25%;position:relative;overflow:hidden}.video-container iframe{border:none;width:100%;height:100%;position:absolute;top:0;left:0}.tutorial-rules{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:1.5rem}.tutorial-rules h2{color:var(--text);margin:1rem 0 .5rem;font-size:1.1rem}.tutorial-rules h2:first-child{margin-top:0}.tutorial-rules ul{padding-left:1.5rem}.tutorial-rules li{color:var(--text-muted);margin-bottom:.4rem;line-height:1.5}@media (width<=540px){.board{max-width:100%}.cell{font-size:1.1rem}.menu h1{font-size:2rem}.game-header{flex-wrap:wrap}}