:root{--bg-primary: #0d0d1a;--bg-secondary: #13132a;--bg-card: #1a1a35;--bg-card-hover: #20203d;--border: #2e2e52;--border-light: #3a3a60;--accent: #e2a84a;--accent-hover: #f0bc60;--accent-dim: rgba(226, 168, 74, .15);--text-primary: #e8e8f5;--text-secondary: #8888b0;--text-muted: #555580;--green: #4cbb7f;--red: #e05c5c;--orange: #e09540;--blue: #5c9fe0;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--shadow-sm: 0 2px 8px rgba(0,0,0,.4);--shadow-md: 0 4px 20px rgba(0,0,0,.5);--shadow-lg: 0 8px 40px rgba(0,0,0,.6);--transition: .18s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%}body{font-family:Segoe UI,system-ui,-apple-system,sans-serif;background:var(--bg-primary);color:var(--text-primary);line-height:1.6;min-height:100vh}h1,h2,h3{font-weight:700;letter-spacing:-.02em}p{color:var(--text-secondary)}small{font-size:.8em;color:var(--text-secondary)}.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 22px;border:none;border-radius:var(--radius-md);font-size:.95rem;font-weight:600;cursor:pointer;transition:background var(--transition),transform var(--transition),box-shadow var(--transition);text-decoration:none}.btn:active{transform:scale(.97)}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.btn-primary{background:var(--accent);color:#1a1000}.btn-primary:hover:not(:disabled){background:var(--accent-hover);box-shadow:0 4px 16px #e2a84a59}.btn-secondary{background:var(--bg-card);color:var(--text-primary);border:1px solid var(--border-light)}.btn-secondary:hover:not(:disabled){background:var(--bg-card-hover);border-color:var(--accent)}.btn-ghost{background:transparent;color:var(--text-secondary);border:1px solid var(--border);padding:7px 14px;font-size:.85rem}.btn-ghost:hover:not(:disabled){color:var(--text-primary);border-color:var(--border-light);background:var(--bg-card)}.btn-sm{padding:6px 14px;font-size:.82rem}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm)}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border-light);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}.home-page{min-height:100vh;display:flex;flex-direction:column}.home-page .ad-banner-top{width:100%}.home-content{flex:1;display:flex;align-items:center;justify-content:center;padding:40px 20px}.home-card{text-align:center;padding:56px 48px;max-width:460px;width:100%}.home-logo{font-size:5rem;margin-bottom:16px;filter:drop-shadow(0 4px 12px rgba(226,168,74,.3));animation:float 3s ease-in-out infinite}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-8px)}}.home-card h1{font-size:2.4rem;color:var(--text-primary);margin-bottom:10px}.home-card h1 span{color:var(--accent)}.home-tagline{font-size:1.05rem;margin-bottom:36px;color:var(--text-secondary)}.home-cta{width:100%;justify-content:center;padding:14px 28px;font-size:1.1rem;border-radius:var(--radius-lg);box-shadow:0 4px 20px #e2a84a40}.home-features{display:flex;justify-content:center;gap:24px;margin-top:32px;flex-wrap:wrap}.feature-pill{display:flex;align-items:center;gap:6px;font-size:.82rem;color:var(--text-secondary);background:var(--bg-secondary);border:1px solid var(--border);border-radius:20px;padding:5px 14px}.feature-pill .icon{font-size:1rem}.home-footer{text-align:center;padding:20px;font-size:.8rem;color:var(--text-secondary);border-top:1px solid var(--border)}.home-game-modes{display:flex;flex-direction:column;gap:12px;width:100%;margin-bottom:4px}.game-mode-card{display:flex;align-items:center;gap:16px;width:100%;padding:16px 20px;background:var(--bg-secondary);border:1px solid var(--border-light);border-radius:var(--radius-md);cursor:pointer;transition:background var(--transition),border-color var(--transition),transform var(--transition);text-align:left}.game-mode-card:hover:not(:disabled){background:var(--bg-card-hover);border-color:var(--accent);transform:translateY(-1px)}.game-mode-card:active:not(:disabled){transform:scale(.98)}.game-mode-card:disabled{opacity:.5;cursor:not-allowed}.game-mode-icon{font-size:1.8rem;flex-shrink:0}.game-mode-title{font-size:1rem;font-weight:700;color:var(--text-primary);margin-bottom:2px}.game-mode-desc{font-size:.8rem;color:var(--text-secondary)}.ttt-board-wrapper{display:flex;justify-content:center;align-items:center;padding:12px 0}.ttt-board{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;width:min(360px,90vw)}.ttt-cell{aspect-ratio:1;background:var(--bg-card);border:2px solid var(--border-light);border-radius:var(--radius-md);font-size:clamp(2rem,8vw,3.5rem);font-weight:900;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background var(--transition),border-color var(--transition),transform var(--transition);color:var(--text-primary);font-family:Segoe UI,system-ui,sans-serif;line-height:1}.ttt-cell:disabled{cursor:not-allowed}.ttt-cell.ttt-cell-hover:hover{background:var(--accent-dim);border-color:var(--accent);transform:scale(1.04)}.ttt-cell-x{color:#5c9fe0;border-color:#5c9fe066}.ttt-cell-o{color:var(--accent);border-color:#e2a84a66}.ttt-cell-win{background:rgba(76,187,127,.15);border-color:var(--green);animation:win-glow .8s ease-in-out infinite alternate}@keyframes win-glow{0%{box-shadow:0 0 8px #4cbb7f4d}to{box-shadow:0 0 20px #4cbb7f99}}.ttt-avatar{font-size:1.1rem;font-weight:900}.ttt-avatar-x{background:rgba(92,159,224,.15);color:#5c9fe0;border:2px solid rgba(92,159,224,.5)}.ttt-avatar-o{background:rgba(226,168,74,.15);color:var(--accent);border:2px solid rgba(226,168,74,.5)}.ad-space{display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--bg-secondary);border:1px dashed var(--border-light);border-radius:var(--radius-md);overflow:hidden;flex-shrink:0}.ad-space .ad-inner{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;width:100%;height:100%;padding:12px}.ad-space .ad-label{font-size:.65rem;letter-spacing:.12em;text-transform:uppercase;color:var(--text-secondary);opacity:.6}.ad-space .ad-placeholder-text{font-size:.82rem;color:var(--text-secondary);font-weight:600;opacity:.5}.ad-space .ad-size{font-size:.7rem;color:var(--text-secondary);opacity:.35}.ad-banner{width:100%;height:90px;border-radius:0;border-left:none;border-right:none}.ad-banner .ad-inner{flex-direction:row;gap:12px}.ad-sidebar{width:160px;height:600px}.ad-rectangle{width:100%;height:250px}.game-page{display:flex;flex-direction:column;min-height:100vh}.game-header{display:flex;align-items:center;justify-content:space-between;padding:12px 24px;background:var(--bg-secondary);border-bottom:1px solid var(--border);gap:12px;flex-wrap:wrap}.game-header-left{display:flex;align-items:center;gap:14px}.game-header-logo{font-size:1.6rem;text-decoration:none;transition:transform var(--transition)}.game-header-logo:hover{transform:scale(1.1)}.game-header h1{font-size:1.2rem;color:var(--text-primary)}.game-id-badge{display:inline-flex;align-items:center;gap:6px;background:var(--bg-card);border:1px solid var(--border);border-radius:20px;padding:3px 12px;font-size:.78rem;color:var(--text-secondary);font-family:monospace}.game-header-actions{display:flex;gap:8px;align-items:center}.game-main{flex:1;display:flex;gap:0;overflow:hidden}.game-sidebar-left,.game-sidebar-right{padding:20px 12px;display:flex;flex-direction:column;align-items:center;gap:16px}.game-center{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:flex-start;padding:20px;gap:12px;min-width:0}.player-info{display:flex;align-items:center;justify-content:space-between;width:100%;max-width:560px;padding:10px 16px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);gap:10px}.player-info.active-turn{border-color:var(--accent);background:var(--accent-dim)}.player-identity{display:flex;align-items:center;gap:10px}.player-avatar{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.1rem;font-weight:700;flex-shrink:0}.player-avatar.white-avatar{background:#f0d9b5;color:#2a2000;border:2px solid #b58863}.player-avatar.black-avatar{background:#3d2b1a;color:#f0d9b5;border:2px solid #b58863}.player-name{font-size:.92rem;font-weight:600;color:var(--text-primary)}.player-role{font-size:.75rem;color:var(--text-secondary)}.turn-dot{width:10px;height:10px;border-radius:50%;background:var(--accent);box-shadow:0 0 8px #e2a84a99;animation:pulse 1.2s ease-in-out infinite}@keyframes pulse{0%,to{transform:scale(1);opacity:1}50%{transform:scale(1.5);opacity:.6}}.board-wrapper{position:relative;width:100%;max-width:560px}.status-bar{width:100%;max-width:560px;padding:10px 18px;border-radius:var(--radius-md);font-size:.9rem;font-weight:600;text-align:center;border:1px solid transparent}.status-waiting{background:rgba(88,88,160,.2);border-color:var(--border-light);color:var(--text-secondary)}.status-your-turn{background:rgba(76,187,127,.15);border-color:var(--green);color:var(--green)}.status-their-turn{background:var(--bg-card);border-color:var(--border);color:var(--text-secondary)}.status-check{background:rgba(224,92,92,.15);border-color:var(--red);color:var(--red)}.status-win{background:rgba(76,187,127,.2);border-color:var(--green);color:var(--green)}.status-loss{background:rgba(224,92,92,.2);border-color:var(--red);color:var(--red)}.status-draw{background:rgba(88,88,160,.2);border-color:var(--blue);color:var(--blue)}.status-error{background:rgba(224,92,92,.2);border-color:var(--red);color:var(--red)}.game-over-actions{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-top:4px}.share-panel{width:100%;max-width:560px;padding:16px 20px;background:var(--accent-dim);border:1px solid var(--accent);border-radius:var(--radius-md);display:flex;flex-direction:column;gap:10px}.share-panel p{font-size:.88rem;color:var(--text-primary)}.share-url-row{display:flex;gap:8px}.share-url-input{flex:1;padding:8px 12px;background:var(--bg-secondary);border:1px solid var(--border-light);border-radius:var(--radius-sm);color:var(--text-primary);font-size:.82rem;font-family:monospace;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;cursor:text;outline:none}.game-right-panel{width:220px;flex-shrink:0;padding:20px 12px;display:flex;flex-direction:column;gap:16px;border-left:1px solid var(--border);background:var(--bg-secondary)}.panel-section-title{font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--text-secondary);padding-bottom:8px;border-bottom:1px solid var(--border);margin-bottom:4px}.move-history-scroll{overflow-y:auto;max-height:320px;display:flex;flex-direction:column;gap:2px}.move-pair{display:grid;grid-template-columns:28px 1fr 1fr;gap:4px;font-size:.82rem;padding:3px 4px;border-radius:4px}.move-pair:hover{background:var(--bg-card)}.move-number{color:var(--text-secondary);font-size:.75rem;padding-top:1px}.move-san{font-family:monospace;font-size:.84rem;color:var(--text-primary);padding:2px 6px;border-radius:3px;cursor:default}.move-san.white-move{color:#f0d9b5}.move-san.black-move{color:#b58863}.move-history-empty{font-size:.82rem;color:var(--text-secondary);text-align:center;padding:20px 0;opacity:.6}.game-footer{border-top:1px solid var(--border)}.full-screen-state{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;padding:20px;text-align:center}.full-screen-state .icon{font-size:3.5rem}.full-screen-state h2{font-size:1.4rem}.full-screen-state p{max-width:380px;font-size:.9rem}.spinner{width:36px;height:36px;border:3px solid var(--border-light);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media (max-width: 900px){.game-sidebar-left,.game-sidebar-right,.game-right-panel{display:none}.game-center{padding:12px}}@media (max-width: 600px){.home-card{padding:32px 20px}.home-card h1{font-size:1.8rem}.game-header{padding:10px 14px}.game-header h1{font-size:1rem}}.checkers-board-wrapper{display:flex;justify-content:center;align-items:center;padding:12px 0}.checkers-board{display:grid;grid-template-columns:repeat(8,1fr);width:var(--board-size, 480px);height:var(--board-size, 480px);border:3px solid var(--accent);border-radius:4px;overflow:hidden;box-shadow:0 8px 32px #0009}.checkers-square{display:flex;align-items:center;justify-content:center;position:relative;cursor:default;transition:background .1s ease}.checkers-square.light{background:#f0d9b5}.checkers-square.dark{background:#b58863}.checkers-square.dark.selectable{cursor:pointer}.checkers-square.dark.valid-dest{background:#7faa7f;cursor:pointer}.checkers-square.dark.capture-dest{background:#aa7f7f;cursor:pointer}.checkers-square.dark.selected{background:#6db56d}.checkers-piece{width:75%;height:75%;border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:0 3px 8px #00000080,inset 0 1px 3px #ffffff26;transition:transform .12s ease,box-shadow .12s ease;cursor:pointer;position:relative}.checkers-piece.red-piece{background:radial-gradient(circle at 35% 30%,#ff7070,#b52020);border:2px solid #8a1a1a}.checkers-piece.black-piece{background:radial-gradient(circle at 35% 30%,#666,#181818);border:2px solid #0a0a0a}.checkers-piece.can-move:hover{transform:scale(1.12);box-shadow:0 4px 14px #0009,0 0 12px #e2a84a8c}.king-crown{color:gold;font-size:.88em;text-shadow:0 1px 3px rgba(0,0,0,.9);pointer-events:none;line-height:1}.move-indicator{width:32%;height:32%;border-radius:50%;background:rgba(0,0,0,.3);pointer-events:none}.move-indicator.capture-indicator{width:44%;height:44%;background:rgba(160,0,0,.45)}.checkers-avatar{font-size:1rem;font-weight:900}.checkers-avatar-red{background:rgba(180,32,32,.2);color:#e05555;border:2px solid rgba(180,32,32,.5)}.checkers-avatar-black{background:rgba(60,60,60,.3);color:#aaa;border:2px solid rgba(80,80,80,.5)}.c4-board-wrapper{display:flex;flex-direction:column;align-items:center;padding:8px 0}.c4-drop-row{display:grid;width:100%;margin-bottom:2px}.c4-drop-cell{display:flex;align-items:center;justify-content:center;cursor:default;border-radius:6px 6px 0 0;transition:background .12s ease}.c4-drop-cell.droppable{cursor:pointer}.c4-drop-cell.droppable:hover{background:rgba(226,168,74,.15)}.c4-preview-piece{width:60%;height:60%;border-radius:50%;opacity:.7;animation:c4-drop-preview .3s ease}@keyframes c4-drop-preview{0%{transform:translateY(-8px);opacity:0}to{transform:translateY(0);opacity:.7}}.c4-board{display:grid;background:#1a5fb4;border-radius:8px;padding:6px;gap:6px;box-shadow:0 8px 32px #0009,inset 0 2px 4px #0000004d}.c4-cell{display:flex;align-items:center;justify-content:center;cursor:pointer;border-radius:50%;background:rgba(255,255,255,.08);transition:background .1s ease}.c4-cell.c4-cell-hover{background:rgba(255,255,255,.15)}.c4-piece{width:82%;height:82%;border-radius:50%;transition:background .15s ease,box-shadow .15s ease}.c4-piece-empty{background:#0d1b2e;box-shadow:inset 0 2px 6px #000000b3}.c4-piece-red{background:radial-gradient(circle at 35% 30%,#ff6b6b,#c0392b);box-shadow:0 2px 8px #00000080,inset 0 1px 2px #fff3;animation:c4-place .25s ease}.c4-piece-yellow{background:radial-gradient(circle at 35% 30%,#ffe066,#e6a817);box-shadow:0 2px 8px #00000080,inset 0 1px 2px #ffffff40;animation:c4-place .25s ease}.c4-piece-win{animation:c4-win-pulse .7s ease-in-out infinite alternate}@keyframes c4-place{0%{transform:scale(.5);opacity:.6}to{transform:scale(1);opacity:1}}@keyframes c4-win-pulse{0%{box-shadow:0 0 6px #fff6,0 0 #fff0}to{box-shadow:0 0 20px #ffffffe6,0 0 30px #fff6}}.c4-avatar{border-radius:50%;width:36px;height:36px}.c4-avatar-red{background:radial-gradient(circle at 35% 30%,#ff6b6b,#c0392b);border:2px solid #8a1a1a}.c4-avatar-yellow{background:radial-gradient(circle at 35% 30%,#ffe066,#e6a817);border:2px solid #9a6800}