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h2{margin:0;font-size:1.5rem;color:#333}.close-button{background:none;border:none;font-size:24px;cursor:pointer;color:#666;padding:0;width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:4px}.close-button:hover{background-color:#f0f0f0;color:#333}.tree-history-content{flex:1;overflow-y:auto;padding:16px 24px 24px}.loading-container{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:40px 20px;color:#666}.loading-spinner{width:32px;height:32px;border:3px solid #f0f0f0;border-top:3px solid #007bff;border-radius:50%;animation:spin 1s linear infinite;margin-bottom:16px}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.error-container{display:flex;flex-direction:column;align-items:center;padding:40px 20px}.error-message{color:#d32f2f;margin-bottom:16px;text-align:center}.retry-button{background-color:#007bff;color:#fff;border:none;padding:8px 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16px;border-radius:4px;cursor:pointer;font-size:14px;font-weight:500}.load-button:hover{background-color:#218838}.delete-button{background-color:#dc3545;color:#fff;border:none;padding:6px 8px;border-radius:4px;cursor:pointer;font-size:14px;display:flex;align-items:center;justify-content:center;min-width:32px;height:32px}.delete-button:hover{background-color:#c82333;transform:scale(1.05)}.theme-dark .tree-history-modal{background:#2d3748}.theme-dark .tree-history-header{border-bottom-color:#4a5568}.theme-dark .tree-history-header h2{color:#e2e8f0}.theme-dark .close-button{color:#a0aec0}.theme-dark .close-button:hover{background-color:#4a5568;color:#e2e8f0}.theme-dark .loading-container{color:#a0aec0}.theme-dark .error-message{color:#fc8181}.theme-dark .empty-state{color:#a0aec0}.theme-dark .tree-item{background-color:#4a5568;border-color:#718096}.theme-dark .tree-item:hover{background-color:#5a6578}.theme-dark .tree-title{color:#e2e8f0}.theme-dark .stat{color:#a0aec0}.theme-dark .tree-date{color:#718096}.theme-dark .delete-button{background-color:#e53e3e}.theme-dark .delete-button:hover{background-color:#c53030}.welcome-overlay{position:fixed;inset:0;background-color:#0009;display:flex;align-items:center;justify-content:center;z-index:1200;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.welcome-modal{background:var(--bg-primary);border:2px solid var(--border-color);border-radius:16px;width:90%;max-width:500px;max-height:80vh;display:flex;flex-direction:column;box-shadow:0 12px 48px var(--shadow-hover);overflow:hidden}.welcome-header{display:flex;justify-content:space-between;align-items:center;padding:1.5rem 2rem;border-bottom:2px solid var(--border-color);background:var(--bg-secondary)}.welcome-header h2{margin:0;font-size:1.5rem;color:var(--text-primary);font-weight:700}.welcome-close-button{background:none;border:none;font-size:24px;cursor:pointer;color:var(--text-secondary);padding:0;width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:50%;transition:all .2s ease}.welcome-close-button:hover{background-color:var(--bg-tertiary);color:var(--text-primary)}.welcome-content{padding:2rem;flex:1;overflow-y:auto}.welcome-steps{display:flex;flex-direction:column;gap:1.5rem;margin-bottom:2rem}.welcome-step{display:flex;align-items:flex-start;gap:1rem}.step-icon{font-size:1.5rem;width:48px;height:48px;display:flex;align-items:center;justify-content:center;background:var(--bg-tertiary);border:2px solid var(--border-color);border-radius:50%;flex-shrink:0}.step-text{flex:1;color:var(--text-primary);line-height:1.5;padding-top:.5rem}.step-text strong{color:var(--accent-blue);font-weight:600}.welcome-footer{display:flex;justify-content:center;margin-top:1rem}.get-started-button{background:linear-gradient(135deg,var(--accent-blue),var(--accent-green));color:#fff;border:none;padding:.75rem 2rem;border-radius:25px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 16px #007bff4d}.get-started-button:hover{transform:translateY(-2px);box-shadow:0 6px 24px #007bff66}.theme-dark .welcome-modal{background:var(--bg-primary);border-color:var(--border-color)}.theme-dark .welcome-header{background:var(--bg-secondary);border-bottom-color:var(--border-color)}.theme-dark .welcome-header h2{color:var(--text-primary)}.theme-dark .welcome-close-button{color:var(--text-secondary)}.theme-dark .welcome-close-button:hover{background-color:var(--bg-tertiary);color:var(--text-primary)}.theme-dark .step-icon{background:var(--bg-tertiary);border-color:var(--border-color)}.theme-dark .step-text{color:var(--text-primary)}.theme-dark .step-text strong{color:var(--accent-blue)}@media (max-width: 768px){.welcome-modal{width:95%;margin:1rem}.welcome-header{padding:1.25rem 1.5rem}.welcome-header h2{font-size:1.25rem}.welcome-content{padding:1.5rem}.welcome-steps{gap:1.25rem;margin-bottom:1.5rem}.welcome-step{gap:.75rem}.step-icon{width:40px;height:40px;font-size:1.25rem}.step-text{font-size:.9rem;padding-top:.25rem}.get-started-button{padding:.625rem 1.5rem;font-size:.9rem}}:root{--bg-primary: #ffffff;--bg-secondary: #f8f9fa;--bg-tertiary: #e9ecef;--text-primary: #212529;--text-secondary: #6c757d;--text-muted: #adb5bd;--border-color: #dee2e6;--shadow: rgba(0, 0, 0, .1);--shadow-hover: rgba(0, 0, 0, .15);--accent-blue: #007bff;--accent-blue-hover: #0056b3;--accent-green: #28a745;--accent-green-hover: #1e7e34;--accent-red: #dc3545;--accent-red-hover: #c82333}.dark{--bg-primary: #1a1d21;--bg-secondary: #212529;--bg-tertiary: #343a40;--text-primary: #f8f9fa;--text-secondary: 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h1{font-size:1.8rem;font-weight:700;-webkit-background-clip:text;background-clip:text}.header-center{flex:1;max-width:400px;display:flex;justify-content:center}.header-right{display:flex;align-items:center;gap:.75rem;flex-shrink:0}.header-button{background:var(--bg-secondary);border:2px solid var(--border-color);border-radius:8px;padding:.5rem .75rem;font-size:.85rem;font-weight:500;cursor:pointer;transition:all .3s ease;box-shadow:0 2px 8px var(--shadow);color:var(--text-primary)}.header-button:hover{background:var(--bg-tertiary);transform:translateY(-1px);box-shadow:0 4px 12px var(--shadow-hover)}.theme-toggle{border-radius:50%!important;width:44px;height:44px;padding:0!important;font-size:1.2rem}.theme-toggle:hover{border-color:var(--accent-blue)}.sign-in-button{background:var(--accent-blue)!important;border-color:var(--accent-blue)!important;color:#fff!important}.sign-in-button:hover{background:var(--accent-blue-hover)!important;border-color:var(--accent-blue-hover)!important}.sign-out-button{background:var(--accent-red)!important;border-color:var(--accent-red)!important;color:#fff!important}.sign-out-button:hover{background:var(--accent-red-hover)!important;border-color:var(--accent-red-hover)!important}.user-info{display:flex;align-items:center;gap:.75rem}.user-name{font-size:.85rem;font-weight:500;color:var(--text-secondary);white-space:nowrap}.storage-toggle{display:flex;align-items:center}.toggle-label{display:flex;align-items:center;gap:.5rem;cursor:pointer;padding:.5rem 1rem;background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:8px;transition:all .2s ease}.toggle-label:hover{background:var(--bg-secondary);border-color:var(--accent-blue)}.toggle-checkbox{margin:0;cursor:pointer}.toggle-text{font-size:.85rem;font-weight:600;color:var(--text-primary);-webkit-user-select:none;user-select:none}.app-header h1{margin:0;font-size:1.75rem;font-weight:700;color:var(--text-primary)}.theme-toggle{background:var(--bg-tertiary);border:2px solid var(--border-color);border-radius:12px;padding:.75rem;font-size:1.25rem;cursor:pointer;transition:all .3s ease;display:flex;align-items:center;justify-content:center;min-width:48px;min-height:48px}.theme-toggle:hover{background:var(--accent-blue);border-color:var(--accent-blue-hover);transform:translateY(-2px) scale(1.05);box-shadow:0 4px 12px var(--shadow-hover)}.app-main{flex:1;margin:0;padding:0;width:100%;box-sizing:border-box}#root{margin:0;padding:0;width:100%;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif}*{box-sizing:border-box}@media (min-width: 1024px){.content-area{flex-direction:row;height:calc(100vh - 140px);min-height:600px}.tree-visualization{flex:0 0 400px;margin-bottom:0;margin-right:1rem}.wiki-viewer{flex:1;min-height:600px}}@media (max-width: 1023px){.app-main{padding:0 .5rem .5rem}.app-header h1{font-size:1.5rem;padding:1rem 1rem 0}.tree-visualization.minimized{order:1}.wiki-viewer{order:2;min-height:400px}.tree-visualization.expanded{order:2;min-height:300px}.tree-visualization.expanded+.wiki-viewer{order:1;min-height:300px}}@media (max-width: 768px){.header-content{padding:.5rem .75rem;gap:.5rem;flex-wrap:wrap}.header-left{flex:none}.header-left h1{font-size:1.4rem}.header-center{order:3;flex-basis:100%;max-width:none;margin-top:.5rem}.header-right{gap:.25rem;flex:none}.header-button{padding:.4rem .6rem;font-size:.8rem;min-width:36px;height:36px}.theme-toggle{width:36px!important;height:36px!important;font-size:1rem!important}.user-name{display:none}.user-info{gap:.25rem}}@media (max-width: 480px){.header-content{padding:.5rem}.header-left h1{font-size:1.2rem}.header-button{padding:.3rem .5rem;font-size:.75rem;min-width:32px;height:32px}.theme-toggle{width:32px!important;height:32px!important;font-size:.9rem!important}}