:root{--color-primary: #69923e;--color-primary-hover: #5a7d35;--color-bg-main: #312e2b;--color-bg-panel: #272522;--color-bg-sidebar: #1a1a1a;--color-bg-surface: #3d3a36;--color-text-primary: #ffffff;--color-text-secondary: #b0b0b0;--color-text-muted: #969696;--color-accent: #e58c00;--color-danger: #e74c3c;--color-warning: #f1c40f;--color-success: #4caf50;--color-border: #454240;--color-player1: #e74c3c;--color-player2: #f1c40f;--color-cell-empty: #1e1c1a;--font-family: "Fredoka", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--spacing-unit: 8px;--header-height: 48px;--sidebar-width: 200px;--sidebar-collapsed-width: 56px;--border-radius: 6px;--border-radius-lg: 12px;--transition-speed: .2s;--color-skeleton: var(--color-bg-surface);--color-skeleton-shimmer: rgba(255, 255, 255, .05);--color-focus-glow: rgba(105, 146, 62, .25)}[data-theme=light]{--color-bg-main: #f0f0f0;--color-bg-panel: #ffffff;--color-bg-sidebar: #e8e8e8;--color-bg-surface: #e0e0e0;--color-text-primary: #1a1a1a;--color-text-secondary: #555555;--color-text-muted: #888888;--color-border: #d0d0d0;--color-cell-empty: #c0c0c0;--color-skeleton: var(--color-bg-surface);--color-skeleton-shimmer: rgba(0, 0, 0, .05);--color-focus-glow: rgba(105, 146, 62, .2)}[data-theme]{transition:background-color var(--transition-speed),color var(--transition-speed),border-color var(--transition-speed)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;border-radius:var(--border-radius);font-weight:600;font-size:14px;cursor:pointer;transition:all var(--transition-speed);white-space:nowrap;-webkit-user-select:none;user-select:none}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-sm{padding:8px 12px;font-size:13px}.btn-md{padding:8px 16px;font-size:14px}.btn-lg{padding:12px 24px;font-size:15px}.btn-primary{background-color:var(--color-primary);color:#fff}.btn-primary:hover:not(:disabled){background-color:var(--color-primary-hover)}.btn:active:not(:disabled){transform:scale(.98)}.btn-secondary{background-color:var(--color-bg-surface);color:var(--color-text-secondary);border:1px solid var(--color-border)}.btn-secondary:hover:not(:disabled){color:var(--color-text-primary);border-color:var(--color-text-muted)}.btn-outline{background-color:transparent;color:var(--color-text-secondary);border:1px solid var(--color-border)}.btn-outline:hover:not(:disabled){background-color:var(--color-bg-surface);color:var(--color-text-primary)}.btn-ghost{background-color:transparent;color:var(--color-text-secondary)}.btn-ghost:hover:not(:disabled){background-color:var(--color-bg-surface);color:var(--color-text-primary)}.btn-danger{background-color:var(--color-danger);color:#fff}.btn-danger:hover:not(:disabled){opacity:.9}.btn-icon{background:transparent;border:none;width:36px;height:36px;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;border-radius:4px;color:var(--color-text-secondary);transition:all var(--transition-speed)}.btn-icon:hover{background-color:var(--color-bg-surface);color:var(--color-text-primary)}.btn-spinner{display:inline-block;width:16px;height:16px;border:2px solid currentColor;border-right-color:transparent;border-radius:50%;animation:spin .6s linear infinite}input,select,textarea{background-color:var(--color-bg-surface);border:1px solid var(--color-border);color:var(--color-text-primary);padding:8px 12px;border-radius:var(--border-radius);font-size:14px;width:100%;transition:border-color var(--transition-speed),box-shadow var(--transition-speed)}input:focus,select:focus,textarea:focus{border-color:var(--color-primary);outline:none;box-shadow:0 0 0 3px var(--color-focus-glow)}.input-group{display:flex;flex-direction:column;gap:8px}.input-label{font-size:14px;font-weight:500;color:var(--color-text-secondary)}.input{padding:8px 12px;border:1px solid var(--color-border);border-radius:var(--border-radius);background-color:var(--color-bg-surface);color:var(--color-text-primary);font-size:14px;transition:border-color var(--transition-speed),box-shadow var(--transition-speed)}.input:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-focus-glow)}.input-error{border-color:var(--color-danger)}.input-error:focus{border-color:var(--color-danger)}.input-error-text{font-size:12px;color:var(--color-danger)}.card{background-color:var(--color-bg-panel);border:1px solid var(--color-border);border-radius:var(--border-radius-lg);padding:24px;transition:transform var(--transition-speed),box-shadow var(--transition-speed)}.card:hover{transform:translateY(-2px);box-shadow:0 4px 12px #00000026}.card-padding-sm{padding:12px}.card-padding-md{padding:20px}.card-padding-lg{padding:32px}.header{height:var(--header-height);background-color:var(--color-bg-sidebar);display:flex;flex-direction:row;align-items:center;padding:0 16px;border-bottom:1px solid var(--color-border);position:fixed;top:0;left:0;right:0;z-index:50}.header-logo-icon{width:96px;height:auto;flex-shrink:0}.header-logo{font-weight:700;font-size:18px;color:#fff;text-decoration:none;cursor:pointer}.header-actions{margin-left:auto;display:flex;flex-direction:row;align-items:center;gap:8px}.header-content{display:flex;align-items:center;width:100%;height:100%}.header-left{display:flex;align-items:center;gap:8px}.header-right{display:flex;align-items:center;gap:8px;margin-left:auto}.header-user{display:flex;align-items:center;gap:8px}.header-username{font-weight:600;color:var(--color-text-primary);font-size:14px}.header-rating{font-size:13px;color:var(--color-text-muted)}.header-auth{display:flex;align-items:center;gap:8px}.header-avatar-btn{background:none;border:none;cursor:pointer;padding:2px;border-radius:50%;transition:opacity var(--transition-speed)}.header-avatar-btn:hover{opacity:.8}.header-user-menu-wrapper{position:relative}.header-user-menu{position:absolute;top:calc(100% + 8px);right:0;width:200px;background:var(--color-bg-panel);border:1px solid var(--color-border);border-radius:var(--border-radius-lg);box-shadow:0 8px 24px #0000004d;z-index:100;overflow:hidden}.header-user-menu-header{padding:12px 16px}.header-user-menu-name{font-weight:600;font-size:14px;color:var(--color-text-primary)}.header-user-menu-divider{height:1px;background:var(--color-border)}.header-user-menu-item{display:block;width:100%;padding:10px 16px;background:none;border:none;text-align:left;font-size:14px;color:var(--color-text-secondary);cursor:pointer;transition:all var(--transition-speed)}.header-user-menu-item:hover{background:var(--color-bg-surface);color:var(--color-text-primary)}.header-user-menu-item-danger{color:var(--color-danger)}.header-user-menu-item-danger:hover{background:#e74c3c1a;color:var(--color-danger)}.sidebar{width:var(--sidebar-width);background-color:var(--color-bg-sidebar);height:calc(100vh - var(--header-height));position:fixed;left:0;top:var(--header-height);border-right:1px solid var(--color-border);display:flex;flex-direction:column;padding:16px 0;overflow-y:auto;transition:width var(--transition-speed);z-index:40}.sidebar-item{display:flex;align-items:center;padding:8px 16px;color:var(--color-text-secondary);text-decoration:none;gap:12px;transition:all var(--transition-speed);font-size:14px;border-radius:0;border-left:3px solid transparent}.sidebar-item:hover{background-color:var(--color-bg-surface);color:var(--color-text-primary);text-decoration:none;border-left-color:var(--color-text-muted)}.sidebar-item.active{color:var(--color-primary);border-left:3px solid var(--color-primary);background-color:#69923e1a}.sidebar-icon{width:20px;height:20px;flex-shrink:0;display:flex;align-items:center}.sidebar-label{white-space:nowrap;overflow:hidden}.sidebar-auth{margin-top:auto;padding:16px;display:flex;flex-direction:column;gap:8px;border-top:1px solid var(--color-border)}.sidebar-auth a{text-decoration:none}.sidebar-auth-btn{width:100%}.app-layout{display:flex;flex-direction:column;height:100vh;overflow:hidden}.app-body{display:flex;flex:1;margin-top:var(--header-height);overflow:hidden}.main-content{flex:1;margin-left:var(--sidebar-width);padding:24px;width:calc(100% - var(--sidebar-width));max-width:100%;transition:margin-left var(--transition-speed);height:calc(100vh - var(--header-height));overflow-y:auto;display:flex;flex-direction:column;align-items:center}.main-content>*{width:100%;max-width:1280px}.main-content-body{min-height:calc(100vh - var(--header-height) - 24px);display:flex;flex-direction:column;align-items:center;flex-shrink:0}.main-content-body>*{width:100%;max-width:1280px}.modal-overlay{position:fixed;top:0;left:0;width:100vw;height:100vh;background-color:#0009;display:flex;align-items:flex-start;justify-content:center;padding-top:20vh;z-index:1000}.modal-content{background-color:var(--color-bg-panel);border-radius:var(--border-radius-lg);padding:32px;max-width:480px;width:90%;animation:modalIn .2s ease}.modal{background-color:var(--color-bg-panel);border-radius:var(--border-radius-lg);padding:32px;max-width:480px;width:90%}@keyframes modalIn{0%{opacity:0;transform:scale(.95) translateY(10px)}to{opacity:1;transform:scale(1) translateY(0)}}.modal-title{font-size:20px;font-weight:600;margin-bottom:16px;color:var(--color-text-primary)}.auth-page{display:flex;align-items:center;justify-content:center;height:100vh;overflow:hidden;background-color:var(--color-bg-main)}.auth-card{max-width:400px;width:100%}.auth-title{font-size:24px;font-weight:700;text-align:center;margin-bottom:24px;color:var(--color-text-primary)}.auth-form{display:flex;flex-direction:column;gap:16px}.auth-submit{width:100%;margin-top:8px}.auth-link{text-align:center;margin-top:16px;font-size:14px;color:var(--color-text-secondary)}.google-btn{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;padding:8px 16px;border:1px solid var(--color-border);border-radius:var(--border-radius);background:var(--color-bg-card);color:var(--color-text-primary);font-size:15px;font-weight:500;cursor:pointer;transition:background .15s,border-color 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var(--transition-speed);display:flex;flex-direction:column;gap:8px}.lobby-card:hover{border-color:var(--color-primary);transform:translateY(-2px);box-shadow:0 4px 12px #00000026}.lobby-card h3,.lobby-card-title{font-size:18px;font-weight:700;margin-bottom:4px;color:var(--color-text-primary)}.lobby-desc,.lobby-card-desc{color:var(--color-text-secondary);font-size:14px}.lobby-stats{display:flex;gap:24px;margin-bottom:24px;font-size:14px;color:var(--color-text-secondary)}.lobby-time-controls{display:flex;gap:8px;margin-bottom:24px}.toast-container{position:fixed;top:16px;right:16px;z-index:200;display:flex;flex-direction:column;gap:8px;pointer-events:none}.toast{padding:12px 20px;border-radius:var(--border-radius);font-size:14px;font-weight:500;color:#fff;box-shadow:0 4px 12px #0000004d;animation:toastIn .3s ease;pointer-events:auto}@keyframes 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p{font-size:16px;color:var(--color-text-secondary)}.page-title{font-size:24px;font-weight:700;margin-bottom:24px;color:var(--color-text-primary)}.page-subtitle{font-size:14px;color:var(--color-text-muted);margin-bottom:24px}.section-heading{font-size:18px;font-weight:600;margin-bottom:16px;color:var(--color-text-primary)}.search-bar{display:flex;gap:8px;margin-bottom:16px}.friend-item{display:flex;align-items:center;padding:12px;border-bottom:1px solid var(--color-border);gap:12px}.online-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}.online-dot.online{background-color:var(--color-success)}.online-dot.offline{background-color:var(--color-text-muted)}.engine-setup{text-align:center;padding:48px 0}.difficulty-buttons{display:flex;gap:16px;justify-content:center;margin-top:24px}.thinking-indicator{text-align:center;color:var(--color-accent);padding:16px;font-size:14px}.draw-offer-bar,.rematch-bar{background-color:var(--color-bg-surface);padding:12px 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dotPulse{0%,to{opacity:1}50%{opacity:.4}}.private-btn{width:100%}.private-divider{text-align:center;font-size:14px;color:var(--color-text-muted);position:relative}.private-divider:before,.private-divider:after{content:"";position:absolute;top:50%;width:40%;height:1px;background-color:var(--color-border)}.private-divider:before{left:0}.private-divider:after{right:0}.private-join{display:flex;gap:8px;align-items:flex-start}.theme-toggle{display:flex;align-items:center;justify-content:center;width:36px;height:36px;border:none;border-radius:50%;background:transparent;color:var(--color-text-secondary);cursor:pointer;transition:all var(--transition-speed)}.theme-toggle:hover{background:var(--color-bg-surface);color:var(--color-text-primary)}.auth-gate{position:relative}.auth-gate-content{filter:blur(6px);pointer-events:none;-webkit-user-select:none;user-select:none;opacity:.4}.auth-gate-overlay{position:fixed;top:var(--header-height);left:var(--sidebar-width);right:0;bottom:0;display:flex;align-items:center;justify-content:center;z-index:10;pointer-events:none}.auth-gate-box{background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--border-radius-lg);padding:32px 40px;text-align:center;box-shadow:0 8px 32px #0006;pointer-events:auto}.auth-gate-box h3{margin:0 0 8px;font-size:20px;color:var(--color-text-primary)}.auth-gate-box p{margin:0 0 24px;color:var(--color-text-secondary);font-size:14px}.auth-gate-actions{display:flex;gap:12px;justify-content:center}.auth-gate-placeholder{height:400px;background:repeating-linear-gradient(0deg,var(--color-bg-surface) 0px,var(--color-bg-surface) 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12px;background:var(--color-primary);color:#fff;border:none;cursor:pointer;font-weight:600;font-size:13px}.chat-page{display:grid;grid-template-columns:280px 1fr;height:calc(100vh - var(--header-height) - 48px);border:1px solid var(--color-border);border-radius:var(--border-radius-lg);overflow:hidden}.chat-sidebar{border-right:1px solid var(--color-border);overflow-y:auto;background:var(--color-bg-panel)}.chat-friend-item{display:flex;align-items:center;padding:12px 16px;gap:12px;cursor:pointer;border-bottom:1px solid var(--color-border);transition:background var(--transition-speed)}.chat-friend-item:hover,.chat-friend-item.active{background:var(--color-bg-surface)}.chat-friend-name{font-weight:600;font-size:14px}.chat-friend-preview{font-size:12px;color:var(--color-text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:180px}.chat-conversation{display:flex;flex-direction:column;background:var(--color-bg-main)}.chat-conversation-header{padding:12px 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