:root{--bg-dark:#131314;--bg-sidebar:#1e1f20;--text-primary:#e3e3e3;--text-secondary:#c4c7c5;--text-muted:#8e8e8e;--accent:#a3c9ff;--item-hover:#ffffff14;--sidebar-width:280px;--sidebar-width-collapsed:68px}body{background-color:var(--bg-dark);color:var(--text-primary);height:100vh;overflow:hidden}#root{height:100%}:root{--bg-dark:#0f1115;--bg-sidebar:#12141ab3;--bg-card:#191c2499;--glass-border:#ffffff14;--glass-shadow:0 8px 32px 0 #000c;--primary-neon:#4285f4;--secondary-neon:#9b72cb;--node-m-neon:#ff4d4d;--node-s-neon:#fc0;--text-primary:#fff;--text-secondary:#b0b3b8;--text-muted:#70757a;--sidebar-width:280px;--sidebar-width-collapsed:72px;--item-hover:#ffffff14}*{box-sizing:border-box;margin:0;padding:0;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}body{background-color:var(--bg-dark);color:var(--text-primary);overflow:hidden}.mesh-background{z-index:-1;filter:blur(80px);background-color:#0f1115;background-image:radial-gradient(at 0 0,#4285f41f 0,#0000 50%),radial-gradient(at 100% 0,#9b72cb1f 0,#0000 50%),radial-gradient(at 100% 100%,#d965701f 0,#0000 50%),radial-gradient(at 0 100%,#4285f414 0,#0000 50%);width:100vw;height:100vh;animation:20s ease-in-out infinite alternate mesh-flow;position:fixed;top:0;left:0}@keyframes mesh-flow{0%{transform:scale(1)}to{transform:scale(1.1)rotate(2deg)}}@keyframes fade-in{0%{opacity:0}to{opacity:1}}@keyframes fade-up{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}.fade-in-element{animation:.5s ease-out forwards fade-in}.fade-up-element{animation:.5s ease-out forwards fade-up}.app-container{background:0 0;width:100%;height:100vh;display:flex;position:relative}.sidebar{background:var(--bg-sidebar);-webkit-backdrop-filter:blur(20px);border-right:1px solid var(--glass-border);white-space:nowrap;z-index:10;flex-direction:column;flex-shrink:0;height:100%;transition:all .4s cubic-bezier(.16,1,.3,1);display:flex;overflow-x:hidden}.sidebar.expanded{width:var(--sidebar-width)}.sidebar.collapsed{width:var(--sidebar-width-collapsed)}.menu-button-container{padding:16px 20px}.icon-button{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;border-radius:12px;justify-content:center;align-items:center;width:40px;height:40px;transition:all .2s;display:flex}.icon-button:hover{background-color:var(--item-hover);color:var(--text-primary);transform:translateY(-1px)}.sidebar-content{flex-direction:column;flex:1;gap:24px;padding:12px;display:flex;overflow:hidden}.new-chat-button{color:var(--text-secondary);cursor:pointer;white-space:nowrap;background-color:#0000;border:none;border-radius:20px;align-items:center;width:100%;padding:10px 12px;font-size:14px;font-weight:500;transition:background-color .2s,width .3s,margin-left .3s,padding .3s,border-radius .3s;display:flex;overflow:hidden}.sidebar.collapsed .new-chat-button{border-radius:50%;width:40px;margin-left:2px;padding:10px}.new-chat-button span{opacity:1;margin-left:12px;transition:opacity .2s,width .3s,margin-left .3s;display:inline-block}.sidebar.collapsed .new-chat-button span{opacity:0;width:0;margin-left:0}.new-chat-button:hover{background-color:var(--item-hover)}.recent-history{flex-direction:column;flex:1;gap:4px;padding-right:4px;transition:opacity .2s;display:flex;overflow-y:auto}.sidebar.collapsed .recent-history{opacity:0;pointer-events:none}.logo-text{background:linear-gradient(135deg,#fff 0%,#888 100%);-webkit-text-fill-color:transparent;letter-spacing:-.5px;-webkit-background-clip:text;background-clip:text;font-size:20px;font-weight:700}.new-chat-button{color:#4285f4;cursor:pointer;background:#4285f41a;border:1px solid #4285f433;border-radius:16px;align-items:center;width:100%;margin-bottom:8px;padding:12px 16px;font-size:14px;font-weight:600;transition:all .3s cubic-bezier(.16,1,.3,1);display:flex}.new-chat-button:hover{background:#4285f433;transform:translateY(-1px);box-shadow:0 0 15px #4285f433}.history-item{color:var(--text-secondary);cursor:pointer;background:0 0;border-radius:12px;align-items:center;margin:2px 0;padding:10px 14px;font-size:14px;transition:all .2s;display:flex}.history-item:hover{background:var(--item-hover);color:var(--text-primary);padding-left:18px}.history-item-wrapper{align-items:center;display:flex;position:relative}.history-item-wrapper>.history-item{text-align:left;flex:1;justify-content:flex-start;min-width:0;padding-right:36px}.history-item-wrapper>.history-item span{text-overflow:ellipsis;white-space:nowrap;text-align:left;flex:1;overflow:hidden}.history-item-menu-btn{color:var(--text-secondary);cursor:pointer;opacity:.55;z-index:5;background:0 0;border:none;border-radius:6px;justify-content:center;align-items:center;padding:4px;transition:opacity .15s,background-color .15s,color .15s;display:flex;position:absolute;top:50%;right:8px;transform:translateY(-50%)}.history-item-wrapper:hover .history-item-menu-btn,.history-item-menu-btn.active{opacity:1}.history-item-menu-btn:hover{color:var(--text-primary);background:#ffffff1f}.history-action-menu{z-index:9999;-webkit-backdrop-filter:blur(12px);background:#1e2129f2;border:1px solid #ffffff14;border-radius:10px;flex-direction:column;gap:2px;min-width:140px;padding:4px;display:flex;box-shadow:0 8px 24px #0006}.history-action-menu button{color:var(--text-secondary);cursor:pointer;text-align:left;background:0 0;border:none;border-radius:6px;align-items:center;gap:8px;width:100%;padding:8px 10px;font-size:13px;transition:background-color .15s,color .15s;display:flex}.history-action-menu button:hover{background:var(--item-hover);color:var(--text-primary)}.history-item-editing{flex:1;align-items:center;gap:8px;display:flex}.history-rename-input{color:var(--text-primary);background:#ffffff0f;border:1px solid #4285f480;border-radius:6px;outline:none;flex:1;min-width:0;padding:4px 8px;font-size:14px}.history-rename-input:focus{background:#ffffff1a;border-color:#4285f4e6}::-webkit-scrollbar{display:none}*{-ms-overflow-style:none;scrollbar-width:none}.main-content{flex-direction:column;flex:1;height:100%;display:flex;position:relative}.top-bar{justify-content:space-between;align-items:center;padding:16px 20px;display:flex}.logo-text{color:var(--text-secondary);font-size:22px;font-weight:500}.user-controls{align-items:center;gap:12px;display:flex}.pro-badge{letter-spacing:.5px;background-color:#ffffff1a;border-radius:4px;padding:4px 8px;font-size:12px;font-weight:700}.avatar{color:#fff;background-color:#1967d2;border-radius:50%;justify-content:center;align-items:center;width:36px;height:36px;font-size:16px;font-weight:700;display:flex}.center-lobby{flex-direction:column;flex:1;justify-content:flex-start;align-items:center;width:100%;min-height:0;padding:0;display:flex;position:relative;overflow:hidden}.center-lobby>div:not(.mesh-background):not(.quiz-container){width:100%;max-width:800px;margin:0 auto;padding:0 20px}.center-lobby>.quiz-container{width:100%;max-width:100%;height:100%;margin:0 auto;padding:0 20px;overflow-y:auto}.center-lobby>.quiz-container::-webkit-scrollbar{width:8px}.center-lobby>.quiz-container::-webkit-scrollbar-track{background:0 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var(--glass-border);background:#1e222a66;border-radius:24px;flex-direction:column;gap:8px;width:100%;max-width:800px;padding:14px 18px;transition:all .3s cubic-bezier(.16,1,.3,1);display:flex;box-shadow:0 10px 40px #0006}.input-area-wrapper.panel-open .input-container{max-width:650px}.input-container:focus-within{background:#23273080;border-color:#4285f466;transform:translateY(-2px);box-shadow:0 0 20px #4285f426,0 10px 40px #00000080}.input-field{color:var(--text-primary);resize:none;background:0 0;border:none;outline:none;width:100%;min-height:40px;max-height:200px;padding:8px 0;font-size:16px;line-height:1.5;transition:height .1s;overflow-y:auto}.input-field::-webkit-scrollbar{width:5px}.input-field::-webkit-scrollbar-track{background:0 0}.input-field::-webkit-scrollbar-thumb{background:#3a3a3a;border-radius:10px}.input-field::-webkit-scrollbar-thumb:hover{background:#4a4a4a}.input-field::placeholder{color:var(--text-muted)}.input-actions{justify-content:space-between;align-items:center;padding:0 8px;display:flex}.input-actions-left,.input-actions-right{gap:8px;display:flex}.action-chips{flex-wrap:wrap;justify-content:center;gap:12px;margin-top:32px;display:flex}.chip{background-color:var(--bg-sidebar);color:var(--text-secondary);cursor:pointer;border:none;border-radius:12px;align-items:center;gap:8px;padding:12px 16px;font-size:14px;transition:background-color .2s;display:flex}.chip:hover{background-color:var(--item-hover)}.login-container{background-color:var(--bg-dark);justify-content:center;align-items:center;width:100vw;height:100vh;display:flex}.login-box{background-color:var(--bg-sidebar);border-radius:24px;flex-direction:column;gap:16px;width:100%;max-width:400px;padding:40px;display:flex;box-shadow:0 8px 32px #0006}.login-title{color:var(--text-primary);text-align:center;margin-bottom:4px;font-size:28px;font-weight:600}.login-subtitle{color:var(--text-secondary);text-align:center;margin-bottom:24px;font-size:14px}.login-input{color:var(--text-primary);background-color:#1a1a1c;border:1px solid #333;border-radius:12px;outline:none;padding:14px 16px;font-size:16px;transition:border-color .2s}.login-input:focus{border-color:#4285f4}.login-actions{gap:12px;margin-top:16px;display:flex}.btn-primary{color:#fff;cursor:pointer;background-color:#4285f4;border:none;border-radius:12px;flex:1;padding:14px;font-size:16px;font-weight:500;transition:background-color .2s}.btn-primary:hover{background-color:#3367d6}.btn-secondary{color:var(--text-primary);cursor:pointer;background-color:#0000;border:1px solid #555;border-radius:12px;flex:1;padding:14px;font-size:16px;font-weight:500;transition:background-color .2s}.error-message{color:#ff8a8a;text-align:center;background-color:#d9657033;border-radius:8px;padding:12px;font-size:14px}.user-greeting{color:var(--text-secondary);margin-bottom:-10px;font-size:40px;font-weight:500}.user-greeting-name{background:linear-gradient(74deg,#4285f4 0%,#9b72cb 9%,#d96570 20% 24%,#9b72cb 35%,#4285f4 44%);-webkit-text-fill-color:transparent;background-size:400% 100%;-webkit-background-clip:text;background-clip:text}.profile-dropdown{background-color:var(--bg-sidebar);z-index:100;cursor:default;border:1px solid #333;border-radius:12px;flex-direction:column;gap:12px;width:200px;padding:16px;display:flex;position:absolute;top:50px;right:0;box-shadow:0 4px 20px #00000080}.dropdown-username{color:var(--text-primary);text-align:center;word-break:break-all;border-bottom:1px solid #333;padding-bottom:12px;font-size:16px;font-weight:600}.dropdown-logout{color:#ff8a8a;cursor:pointer;background-color:#0000;border:none;border-radius:8px;padding:8px;font-size:14px;font-weight:500;transition:background-color .2s}.dropdown-logout:hover{background-color:#ff8a8a1a}.dropdown-delete{color:#a0a0a0;cursor:pointer;background-color:#0000;border:none;border-radius:8px;padding:8px;font-size:13px;font-weight:500;transition:all .2s}.dropdown-delete:hover{color:#ff8a8a;background-color:#ffffff0d}.trash-btn:hover{color:#d96570}.modal-overlay{z-index:1000;background-color:#000000b3;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.modal-box{-webkit-backdrop-filter:blur(20px);text-align:center;border:1px solid var(--glass-border);width:380px;color:var(--text-primary);box-shadow:var(--glass-shadow);background:#191c24d9;border-radius:24px;padding:32px;animation:.4s cubic-bezier(.16,1,.3,1) forwards fade-up}.modal-box h3{color:#fff;margin-top:0;font-size:18px}.modal-actions{justify-content:center;gap:12px;margin-top:20px;display:flex}.btn-secondary{color:#fff;cursor:pointer;background-color:#333;border:none;border-radius:6px;padding:8px 16px;transition:background .2s}.btn-secondary:hover{background-color:#444}.btn-danger{cursor:pointer;border:none;border-radius:6px;padding:8px 16px;font-weight:600;transition:opacity .2s}.btn-danger:hover{opacity:.9}.empty-project-placeholder{text-align:center;color:gray;flex-direction:column;justify-content:center;align-items:center;height:100%;padding:40px;display:flex}.empty-project-placeholder h3{color:#e3e3e3;margin:16px 0 8px;font-size:20px}.empty-project-placeholder p{max-width:250px;font-size:14px;line-height:1.5}.current-node-context-wrapper{align-items:center;display:flex;position:relative}.current-node-context-inline.clickable{cursor:pointer;color:#4285f4;white-space:nowrap;background:#4285f41a;border:1px solid #4285f44d;border-radius:12px;padding:4px 10px;font-size:13px;font-weight:500;transition:all .2s}.current-node-context-inline.clickable:hover{background:#4285f433;transform:translateY(-1px)}.context-selector-popup{z-index:1000;background:#202124;border:1px solid #3c4043;border-radius:12px;flex-direction:column;width:240px;max-height:300px;margin-bottom:12px;display:flex;position:absolute;bottom:100%;left:0;overflow:hidden;box-shadow:0 8px 16px #00000080}.context-popup-header{color:#9aa0a6;text-transform:uppercase;border-bottom:1px solid #3c4043;padding:12px;font-size:12px;font-weight:600}.context-popup-list{padding:6px;overflow-y:auto}.context-list-item{text-align:left;cursor:pointer;background:0 0;border:none;border-radius:8px;flex-direction:column;gap:2px;width:100%;padding:10px 12px;transition:background .2s;display:flex}.context-list-item:hover{background:#303134}.context-list-item.active{background:#4285f426}.context-list-item .item-label{color:#4285f4;font-size:11px;font-weight:600}.context-list-item .item-title{color:#e3e3e3;white-space:nowrap;text-overflow:ellipsis;font-size:13px;overflow:hidden}.image-preview-container{justify-content:flex-start;display:flex}.preview-bubble{background-color:#000;border:2px solid #4285f4;border-radius:12px;width:60px;height:60px;position:relative;overflow:hidden}.preview-bubble img{object-fit:cover;width:100%;height:100%}.remove-image-btn{color:#fff;cursor:pointer;background-color:#0009;border:none;border-radius:50%;justify-content:center;align-items:center;width:18px;height:18px;padding:0;transition:background-color .2s;display:flex;position:absolute;top:2px;right:2px}.remove-image-btn:hover{background-color:#f009}.project-sidebar-header{border-bottom:1px solid #333;flex-direction:column;gap:16px;padding:16px;display:flex}.header-top{justify-content:space-between;align-items:center;display:flex}.project-title-display{color:var(--text-primary);cursor:pointer;text-overflow:ellipsis;white-space:nowrap;border:1px solid #0000;border-radius:4px;padding:4px 0;font-size:18px;font-weight:600;transition:all .2s;overflow:hidden}.project-title-display:hover{background-color:#ffffff0d}.project-title-edit-active{color:var(--text-primary);background-color:#1a1a1c;border:1px solid #4285f4;border-radius:4px;outline:none;width:100%;padding:4px 8px;font-size:18px;font-weight:600}.view-mode-tabs{justify-content:center;gap:32px;padding:12px 0;display:flex}.view-mode-btn{color:gray;cursor:pointer;background:0 0;border:none;flex-direction:column;align-items:center;gap:4px;font-size:11px;display:flex}.view-mode-btn.active{color:#c48fff}.view-mode-icon{background-color:#2a2a2c;border-radius:50%;justify-content:center;align-items:center;width:32px;height:32px;transition:all .2s;display:flex}.view-mode-btn.active .view-mode-icon{background-color:#c48fff33}.node-list-tabs{background:#0003;border-radius:12px;gap:4px;margin:12px 16px;padding:4px;display:flex}.node-tab{text-align:center;color:var(--text-muted);cursor:pointer;border-radius:8px;flex:1;padding:8px;font-size:12px;font-weight:600;transition:all .2s}.node-tab:hover{color:var(--text-secondary)}.node-tab.active{color:var(--secondary-neon);background:#9b72cb26;box-shadow:0 4px 12px #0003}.nodes-container{flex:1;padding:8px;overflow-y:auto}.node-item{cursor:pointer;background:0 0;border:1px solid #0000;border-radius:14px;align-items:center;gap:12px;width:calc(100% - 16px);margin:4px 8px;padding:12px 14px;transition:all .3s cubic-bezier(.16,1,.3,1);display:flex;position:relative;overflow:hidden}.node-item:hover{background:#ffffff0d;transform:translate(4px)}.node-item.selected{background:#4285f414;border-color:#4285f44d;box-shadow:0 0 20px #4285f41a}.node-item.selected:before{content:"";background:var(--primary-neon);width:4px;box-shadow:0 0 10px var(--primary-neon);position:absolute;top:0;bottom:0;left:0}.node-item.indent-sub{opacity:.85;padding-left:28px}.node-tag{text-transform:uppercase;letter-spacing:.5px;text-align:center;border-radius:6px;min-width:44px;padding:2px 8px;font-size:10px;font-weight:800;display:inline-block}.tag-red{color:#ff4d4d;background:#ff4d4d1f;border:1px solid #ff4d4d4d;box-shadow:0 0 10px #ff4d4d1a}.tag-yellow{color:#fc0;background:#ffcc001f;border:1px solid #ffcc004d;box-shadow:0 0 10px #ffcc001a}.tag-blue{color:#4ea8de;background:#4ea8de1f;border:1px solid #4ea8de4d;box-shadow:0 0 10px #4ea8de1a}.node-item-title{color:#d1d1d1;white-space:nowrap;text-overflow:ellipsis;flex:1;font-size:14px;overflow:hidden}.collapse-toggle-btn{cursor:pointer;opacity:.7;background:0 0;border:none;border-radius:4px;flex-shrink:0;justify-content:center;align-items:center;padding:2px 4px;transition:opacity .15s,background .15s;display:flex}.collapse-toggle-btn:hover{opacity:1;background:#ffffff1a}.score-group-view{flex-direction:column;gap:4px;padding:4px 0;display:flex}.score-group{background:#ffffff08;border:1px solid #ffffff0f;border-radius:8px;overflow:hidden}.score-group-header{background:#ffffff0d;border-bottom:1px solid #ffffff0f;align-items:center;gap:8px;padding:8px 12px;display:flex}.score-group-dots{gap:3px;display:flex}.score-dot{background:#ffffff1a;border-radius:2px;width:12px;height:4px;transition:all .3s}.score-dot.filled{background:var(--primary-neon);box-shadow:0 0 10px var(--primary-neon)}.score-group-label{color:#bdc1c6;flex:1;font-size:12px;font-weight:600}.score-group-count{color:#5f6368;background:#ffffff14;border-radius:10px;padding:2px 6px;font-size:11px}.score-group-items{flex-direction:column;display:flex}.score-node-item{padding-left:12px!important}.score-group-empty{color:#5f6368;padding:8px 12px;font-size:12px;font-style:italic}.node-detail-container{flex-direction:column;gap:32px;width:100%;height:100%;padding:24px 0;display:flex;overflow-y:auto}.node-detail-header{background-color:#212121;border-radius:12px;flex-direction:column;gap:16px;padding:20px;display:flex}.header-row{flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:16px;display:flex}.node-info-group{align-items:center;gap:12px;font-size:16px;font-weight:500;display:flex}.node-detail-container{flex-direction:column;flex:1;width:100%;max-width:800px;margin:0 auto;padding-top:20px;padding-bottom:150px;display:flex}.understanding-score-wrap{color:#a0a0a0;align-items:center;gap:16px;font-size:13px;display:flex}.gauge-block-container{gap:6px;display:flex}.gauge-block{cursor:pointer;background-color:#333;border-radius:2px;width:24px;height:8px;transition:all 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