*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background:linear-gradient(135deg,#1a1a2e,#16213e);overflow:hidden;color:#fff;padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left)}#app{width:100vw;height:100vh;position:relative}#game-canvas{width:100%;height:100%;display:block}#ui-overlay{position:absolute;top:0;left:0;padding:20px;pointer-events:none}#ui-overlay>*{pointer-events:auto}#game-info{background:#000000b3;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:12px;padding:20px;margin-bottom:15px;border:1px solid rgba(255,255,255,.1)}#game-info h1{font-size:1.8rem;margin-bottom:5px;background:linear-gradient(90deg,#f0d9b5,#b58863);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.domain-link{margin-bottom:10px}.domain-link a{color:#fff9;text-decoration:none;font-size:.85rem;transition:color .3s}.domain-link a:hover{color:#f0d9b5}#turn-indicator{font-size:1.1rem;margin-bottom:15px;display:flex;align-items:center;gap:8px}#current-player-stone{width:24px;height:24px}#score-display{display:flex;flex-direction:column;gap:8px}.score-item{display:flex;align-items:center;gap:10px;font-size:1rem}.stone{width:20px;height:20px;border-radius:50%;display:inline-block}.black-stone{background:radial-gradient(circle at 30% 30%,#555,#111);box-shadow:2px 2px 4px #00000080}.white-stone{background:radial-gradient(circle at 30% 30%,#fff,#ccc);box-shadow:2px 2px 4px #0000004d}#controls{background:#000000b3;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:12px;padding:20px;border:1px solid rgba(255,255,255,.1)}.control-group{margin-bottom:15px}.control-group label{display:block;margin-bottom:5px;font-size:.9rem;color:#aaa}.control-group select{width:100%;padding:8px 12px;border-radius:6px;border:1px solid rgba(255,255,255,.2);background:#ffffff1a;color:#fff;font-size:.95rem;cursor:pointer}.control-group select:focus{outline:none;border-color:#b58863}.button-group{display:grid;grid-template-columns:1fr 1fr;gap:10px}.button-group button{padding:10px 15px;border:none;border-radius:6px;font-size:.95rem;cursor:pointer;transition:all .2s ease}#new-game-btn{background:linear-gradient(135deg,#4caf50,#45a049);color:#fff;grid-column:span 2}#new-game-btn:hover{transform:translateY(-2px);box-shadow:0 4px 12px #4caf5066}#pass-btn{background:linear-gradient(135deg,#2196f3,#1976d2);color:#fff}#pass-btn:hover{transform:translateY(-2px);box-shadow:0 4px 12px #2196f366}#undo-btn{background:linear-gradient(135deg,#ff9800,#f57c00);color:#fff}#undo-btn:hover{transform:translateY(-2px);box-shadow:0 4px 12px #ff980066}#resign-btn{background:linear-gradient(135deg,#f44336,#d32f2f);color:#fff;grid-column:span 2}#resign-btn:hover{transform:translateY(-2px);box-shadow:0 4px 12px #f4433666}button:active{transform:translateY(0)}#status-message{margin-top:15px;padding:15px;background:#000000b3;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:12px;border:1px solid rgba(255,255,255,.1);font-size:1rem;text-align:center;display:none}#status-message.visible{display:block}#status-message.game-over{background:#4caf504d;border-color:#4caf50}#loading-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#00000080;display:none;justify-content:center;align-items:center;flex-direction:column;gap:20px;z-index:1000}#loading-overlay.visible{display:flex}.spinner{width:50px;height:50px;border:4px solid rgba(255,255,255,.3);border-top-color:#b58863;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media (max-width: 1024px){#ui-overlay{padding:15px}#game-info,#controls{padding:15px;max-width:280px}}@media (max-width: 768px){#ui-overlay{padding:10px;width:100%;display:flex;flex-direction:column}#game-info,#controls{padding:12px;max-width:none;width:100%}#game-info h1{font-size:1.4rem}.button-group{grid-template-columns:1fr 1fr;gap:8px}.button-group button{padding:10px 12px;font-size:.85rem}#new-game-btn,#resign-btn{grid-column:span 1}.control-group{margin-bottom:10px}.control-group label{font-size:.85rem}.control-group select{padding:8px;font-size:.9rem}.utility-buttons{gap:8px}.utility-btn{padding:10px;font-size:1.1rem}}@media (max-width: 480px){#ui-overlay{padding:8px;max-width:160px}#game-info,#controls{padding:10px;border-radius:8px}#game-info h1{font-size:1.1rem;margin-bottom:3px}.domain-link{margin-bottom:6px}.domain-link a{font-size:.7rem}#turn-indicator{font-size:.9rem;margin-bottom:8px}#score-display{gap:4px}.score-item{font-size:.85rem;gap:6px}.stone{width:16px;height:16px}.control-group{margin-bottom:8px}.control-group label{font-size:.75rem;margin-bottom:3px}.control-group select{padding:6px;font-size:.8rem}.button-group{grid-template-columns:1fr 1fr;gap:5px}.button-group button{padding:8px 6px;font-size:.75rem}.utility-buttons{gap:5px}.utility-btn{padding:8px;font-size:1rem;min-width:36px}#how-to-play-btn{padding:8px;font-size:.75rem}#player-color-group label,#handicap-group label,#ai-strength-group label{display:none}}@media (max-height: 500px) and (orientation: landscape){#ui-overlay{flex-direction:row;align-items:flex-start;gap:10px;max-height:100vh;overflow-y:auto;max-width:none;width:auto}#game-info{max-width:140px;padding:8px}#controls{max-width:150px;padding:8px}#game-info h1{font-size:1rem;margin-bottom:3px}.domain-link{display:none}#turn-indicator{font-size:.85rem;margin-bottom:6px}#score-display{flex-direction:row;gap:10px}.score-item{font-size:.8rem}.control-group{margin-bottom:6px}.control-group label{display:none}.control-group select{padding:5px;font-size:.75rem}.button-group{grid-template-columns:1fr 1fr;gap:4px}.button-group button{padding:6px 4px;font-size:.7rem}.utility-buttons{gap:4px}.utility-btn{padding:6px;font-size:.9rem;min-width:32px}#how-to-play-btn{padding:6px;font-size:.7rem}}@media (hover: none){.button-group button:hover{transform:none;box-shadow:none}.button-group button:active{transform:scale(.95);background:#ffffff40}.utility-btn:active{transform:scale(.95)}.button-group button,.utility-btn,.control-group select{min-height:44px}}@media (pointer: coarse){#ui-overlay{-webkit-user-select:none;user-select:none}#game-canvas{touch-action:none}}.utility-buttons{display:flex;gap:10px;margin-top:15px}.utility-btn{flex:1;padding:12px;border:none;border-radius:6px;font-size:1.3rem;cursor:pointer;background:linear-gradient(135deg,#607d8b,#455a64);color:#fff;transition:all .2s ease}.utility-btn:hover{transform:translateY(-2px);box-shadow:0 4px 12px #607d8b66}.utility-btn.muted{background:linear-gradient(135deg,#555,#333);opacity:.7}#how-to-play-btn{width:100%;margin-top:10px;padding:12px 15px;border:none;border-radius:6px;font-size:1rem;cursor:pointer;background:linear-gradient(135deg,#9c27b0,#7b1fa2);color:#fff;transition:all .2s ease}#how-to-play-btn:hover{transform:translateY(-2px);box-shadow:0 4px 12px #9c27b066}.modal{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:#000000d9;z-index:2000;overflow-y:auto;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.modal.visible{display:flex;justify-content:center;align-items:center}.game-over-content{position:relative;background:linear-gradient(135deg,#1e1e2e,#2d2d44);border-radius:20px;padding:50px 60px;text-align:center;box-shadow:0 25px 80px #0009;border:1px solid rgba(255,255,255,.1);max-width:500px;width:90%;animation:modalSlideIn .4s ease-out;overflow:hidden}@keyframes modalSlideIn{0%{opacity:0;transform:scale(.8) translateY(-30px)}to{opacity:1;transform:scale(1) translateY(0)}}.game-over-icon{font-size:5rem;margin-bottom:15px;animation:iconBounce .6s ease-out .2s both}@keyframes iconBounce{0%{transform:scale(0)}50%{transform:scale(1.2)}to{transform:scale(1)}}.game-over-content h1{font-size:2.5rem;margin-bottom:10px;background:linear-gradient(90deg,gold,orange);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.game-over-content.defeat h1{background:linear-gradient(90deg,#888,#666);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}#game-over-message{font-size:1.1rem;color:#aaa;margin-bottom:30px}.final-scores{display:flex;justify-content:center;align-items:center;gap:25px;margin-bottom:35px;padding:25px;background:#0000004d;border-radius:15px}.final-score{display:flex;flex-direction:column;align-items:center;gap:8px}.final-score .stone{width:40px;height:40px}.final-score .score-label{font-size:.9rem;color:#888;text-transform:uppercase;letter-spacing:1px}.final-score .score-value{font-size:2rem;font-weight:700;color:#fff}.final-score.winner .score-value{color:gold;text-shadow:0 0 20px rgba(255,215,0,.5)}.score-divider{font-size:1.2rem;color:#666;font-weight:700}.play-again-btn{padding:18px 50px;font-size:1.2rem;border:none;border-radius:30px;background:linear-gradient(135deg,#4caf50,#45a049);color:#fff;cursor:pointer;transition:all .2s;font-weight:700}.play-again-btn:hover{transform:translateY(-3px);box-shadow:0 8px 25px #4caf5066}#confetti-container{position:absolute;top:0;left:0;width:100%;height:100%;pointer-events:none;overflow:hidden}.confetti{position:absolute;width:10px;height:10px;top:-10px;animation:confettiFall 3s ease-out forwards}@keyframes confettiFall{0%{transform:translateY(0) rotate(0);opacity:1}to{transform:translateY(500px) rotate(720deg);opacity:0}}.modal-content{position:relative;max-width:900px;margin:20px auto;background:linear-gradient(135deg,#1e1e2e,#2d2d44);border-radius:16px;padding:40px;box-shadow:0 20px 60px #00000080;border:1px solid rgba(255,255,255,.1)}.modal-close{position:absolute;top:15px;right:20px;background:none;border:none;font-size:2rem;color:#888;cursor:pointer;transition:color .2s;line-height:1}.modal-close:hover{color:#fff}.guide-container{color:#e0e0e0}.guide-container h1{font-size:2.5rem;text-align:center;margin-bottom:10px;background:linear-gradient(90deg,#f0d9b5,#b58863);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.guide-intro{text-align:center;font-size:1.1rem;color:#aaa;margin-bottom:25px;max-width:600px;margin-left:auto;margin-right:auto}.guide-nav{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-bottom:30px;padding:15px;background:#0000004d;border-radius:10px}.guide-nav a{color:#b58863;text-decoration:none;padding:8px 16px;border-radius:20px;background:#b588631a;transition:all .2s;font-size:.95rem}.guide-nav a:hover{background:#b588634d;color:#f0d9b5}.guide-section{margin-bottom:40px;padding-bottom:30px;border-bottom:1px solid rgba(255,255,255,.1)}.guide-section:last-of-type{border-bottom:none}.guide-section h2{font-size:1.6rem;margin-bottom:20px;color:#f0d9b5}.guide-section h3{font-size:1.1rem;margin:15px 0 8px;color:#ddd}.guide-content{display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:start}.guide-text{line-height:1.7}.guide-text p{margin-bottom:12px}.guide-text ul{margin-left:20px;margin-bottom:12px}.guide-text li{margin-bottom:8px}.guide-text strong{color:#f0d9b5}.guide-text em{color:#b58863;font-style:normal}.guide-diagram{display:flex;flex-direction:column;align-items:center}.board-diagram{width:100%;max-width:250px;height:auto;border-radius:8px;box-shadow:0 4px 15px #0000004d}.board-diagram.wide{max-width:100%}.diagram-caption{margin-top:10px;font-size:.85rem;color:#888;text-align:center}.tips-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:30px}.tip-card{background:#0000004d;border-radius:12px;padding:20px;text-align:center;border:1px solid rgba(255,255,255,.05);transition:transform .2s,box-shadow .2s}.tip-card:hover{transform:translateY(-3px);box-shadow:0 8px 25px #0000004d}.tip-icon{font-size:2rem;margin-bottom:10px}.tip-card h3{font-size:1rem;margin-bottom:8px;color:#f0d9b5}.tip-card p{font-size:.9rem;color:#aaa;line-height:1.5}.two-eyes-diagram{background:#0003;border-radius:12px;padding:20px;text-align:center}.two-eyes-diagram h3{margin-bottom:15px;color:#f0d9b5}.two-eyes-diagram .board-diagram{max-width:400px}.controls-reference{display:grid;grid-template-columns:repeat(2,1fr);gap:15px}.control-item{display:flex;flex-direction:column;background:#0003;padding:15px;border-radius:8px}.control-item strong{color:#f0d9b5;margin-bottom:5px}.control-item span{font-size:.9rem;color:#aaa}.guide-footer{text-align:center;margin-top:30px;padding-top:30px;border-top:1px solid rgba(255,255,255,.1)}.guide-footer p{font-size:1.1rem;color:#aaa;margin-bottom:20px}.start-playing-btn{padding:15px 40px;font-size:1.1rem;border:none;border-radius:30px;background:linear-gradient(135deg,#4caf50,#45a049);color:#fff;cursor:pointer;transition:all .2s}.start-playing-btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px #4caf5066}@media (max-width: 768px){.modal-content{margin:10px;padding:20px}.guide-container h1{font-size:1.8rem}.guide-content{grid-template-columns:1fr}.guide-diagram{order:-1}.tips-grid,.controls-reference{grid-template-columns:1fr}.guide-nav{gap:8px}.guide-nav a{padding:6px 12px;font-size:.85rem}}.auth-content{background:linear-gradient(145deg,#1e1e2e,#2a2a3e);border-radius:16px;padding:40px;max-width:400px;width:90%;margin:auto;text-align:center;border:1px solid rgba(255,255,255,.1);box-shadow:0 20px 60px #00000080}.auth-content h1{font-size:2rem;margin-bottom:8px;background:linear-gradient(90deg,#f0d9b5,#b58863);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.auth-subtitle{color:#fff9;margin-bottom:24px}.auth-error{background:#e74c3c33;border:1px solid #e74c3c;color:#e74c3c;padding:12px;border-radius:8px;margin-bottom:16px;font-size:.9rem;display:none}.auth-error.visible{display:block}.auth-tabs{display:flex;gap:8px;margin-bottom:20px}.auth-tab{flex:1;padding:12px;border:none;background:#ffffff1a;color:#fff9;border-radius:8px;cursor:pointer;transition:all .2s;font-size:.95rem}.auth-tab:hover{background:#ffffff26}.auth-tab.active{background:#fff3;color:#fff}.auth-form{display:flex;flex-direction:column;gap:16px}.form-group{text-align:left}.form-group label{display:block;margin-bottom:6px;font-size:.9rem;color:#fffc}.form-group input{width:100%;padding:12px 16px;border:1px solid rgba(255,255,255,.2);border-radius:8px;background:#0000004d;color:#fff;font-size:1rem;transition:border-color .2s}.form-group input:focus{outline:none;border-color:#b58863}.form-group input::placeholder{color:#fff6}.auth-btn{padding:14px 24px;border:none;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s;display:flex;align-items:center;justify-content:center;gap:10px}.auth-btn.primary{background:linear-gradient(135deg,#b58863,#8b6914);color:#fff}.auth-btn.primary:hover{transform:translateY(-2px);box-shadow:0 4px 15px #b5886366}.auth-btn.google{background:#fff;color:#333;width:100%}.auth-btn.google:hover{background:#f5f5f5;transform:translateY(-2px);box-shadow:0 4px 15px #0003}.auth-divider{display:flex;align-items:center;margin:20px 0}.auth-divider:before,.auth-divider:after{content:"";flex:1;height:1px;background:#fff3}.auth-divider span{padding:0 16px;color:#ffffff80;font-size:.9rem}.auth-footer{margin-top:20px;font-size:.85rem;color:#ffffff80}#user-info{display:flex;align-items:center;justify-content:space-between;gap:12px;padding-bottom:12px;margin-bottom:12px;border-bottom:1px solid rgba(255,255,255,.1)}.user-profile{display:flex;align-items:center;gap:10px;flex:1;min-width:0}.user-avatar{width:32px;height:32px;min-width:32px;border-radius:50%;background:linear-gradient(135deg,#b58863,#8b6914);object-fit:cover}#user-name{font-weight:500;font-size:.9rem;color:#ffffffe6;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.sign-out-btn{padding:6px 12px;border:1px solid rgba(255,255,255,.2);background:transparent;color:#ffffffb3;border-radius:6px;font-size:.8rem;cursor:pointer;transition:all .2s}.sign-out-btn:hover{background:#ffffff1a;color:#fff}@media (max-width: 480px){.auth-content{padding:24px}.auth-content h1{font-size:1.6rem}.auth-tabs{flex-direction:column}#user-info{flex-direction:column;gap:10px;text-align:center}.user-profile{flex-direction:column}}