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textarea:focus{border-color:var(--accent)}.chat-popup-input button{background:var(--accent);color:#fff;cursor:pointer;font-size:13px;font-family:var(--font-body);border:none;border-radius:8px;padding:8px 14px}.chat-popup-input button:disabled{opacity:.4}.chat-msg{word-break:break-word;border-radius:12px;max-width:85%;padding:8px 12px;font-size:13px;line-height:1.5}.chat-msg.user{background:var(--accent);color:#fff;border-bottom-right-radius:4px;align-self:flex-end}.chat-msg.assistant{background:var(--bg-nav);color:var(--text-primary);border-bottom-left-radius:4px;align-self:flex-start}.random-actions{flex-wrap:wrap;gap:10px;margin:10px 0;display:flex}.viz-container{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);min-height:300px;margin:16px 0;padding:20px;overflow:hidden}.viz-container h4{font-family:var(--font-heading);margin-bottom:12px}.te-section{margin:16px 0}.te-card{background:var(--bg-card);border:1px solid var(--border);box-shadow:var(--shadow-card);border-radius:12px;margin:16px 0;overflow:hidden}.te-header{border-bottom:1px solid var(--border);align-items:flex-start;gap:16px;padding:20px 20px 12px;display:flex}.te-number{background:var(--accent);color:#fff;width:36px;height:36px;font-size:16px;font-weight:700;font-family:var(--font-heading);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;display:flex}.thr-number{background:var(--accent-warm)}.te-header h4{font-family:var(--font-heading);border:none;margin:0 0 4px;padding:0;font-size:15px}.te-header p{color:var(--text-secondary);margin:0;font-size:13px;line-height:1.6}.te-plot{min-height:360px;padding:0}.te-controls{background:var(--bg-nav);flex-wrap:wrap;align-items:center;gap:12px;padding:10px 20px;font-size:13px;display:flex}.te-controls label{color:var(--text-secondary);font-size:12px}.te-controls input[type=range]{-webkit-appearance:none;background:var(--border);border-radius:2px;outline:none;height:4px}.te-controls input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;background:var(--accent);cursor:pointer;border-radius:50%;width:16px;height:16px}.te-controls input[type=range]::-moz-range-thumb{background:var(--accent);cursor:pointer;border:none;border-radius:50%;width:16px;height:16px}.te-reveal{text-align:center;padding:12px 20px 20px}.te-explanation{text-align:left;color:var(--text-primary);padding:16px 0 0;font-size:14px;line-height:1.8;animation:.3s fadeUp}.te-explanation-visible{display:block!important}.te-explanation p{margin:8px 0}.te-explanation blockquote{border-left:3px solid var(--accent-warm);background:var(--bg-nav);border-radius:0 var(--radius) var(--radius) 0;color:var(--text-secondary);margin:8px 0;padding:6px 16px}.te-explanation ul{margin:8px 0;padding-left:20px}.te-explanation li{margin:4px 0}p.pointer{color:#fff;font-family:var(--font-mono)}.workshop-layout{max-width:100%;height:calc(100vh - 90px);display:flex;overflow:hidden}.workshop-sidebar{border-right:1px solid var(--border);background:var(--bg-nav);width:360px;min-width:360px;padding:24px 20px;overflow-y:auto}.workshop-main{flex:1;padding:24px;overflow-y:auto}.workshop-plot-area{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;min-height:500px;position:relative;overflow:hidden}.workshop-plot-area .ws-placeholder{pointer-events:none;justify-content:center;align-items:center;display:flex;position:absolute;inset:0}.ws-mode-tabs{border:1px solid var(--border);border-radius:8px;gap:0;margin:0;display:flex;overflow:hidden}.ws-mode-tab{background:var(--bg-card);color:var(--text-secondary);cursor:pointer;font-size:12px;font-family:var(--font-body);border:none;border-right:1px solid var(--border);flex:1;padding:8px 12px;transition:all .15s}.ws-mode-tab:last-child{border-right:none}.ws-mode-tab:hover{background:var(--bg-nav)}.ws-mode-tab.active{background:var(--accent);color:#fff;font-weight:600}.ws-preset-group{margin-bottom:10px}.login-box-old{background:var(--bg-card);z-index:999;border-radius:12px;width:480px;max-width:92vw;overflow:hidden;box-shadow:0 4px 24px #00000026;display:none!important;position:fixed!important;top:50%!important;left:50%!important;transform:translate(-50%,-50%)!important}.login-box-old.show{display:flex!important}.login-left{color:#fff;text-align:center;background:linear-gradient(160deg,#1e2935,#3a5a7c);flex-direction:column;flex-shrink:0;justify-content:center;align-items:center;width:160px;padding:40px 24px;display:flex}.login-logo{font-family:var(--font-heading);letter-spacing:2px;margin-bottom:8px;font-size:18px;font-weight:700}.login-sub{opacity:.7;font-size:12px;line-height:1.6}.login-right{flex:1;padding:32px 28px}.login-tabs{gap:20px;margin-bottom:24px;display:flex}.login-tab{color:var(--text-muted);cursor:pointer;font-size:15px;font-family:var(--font-heading);border-bottom:2px solid #0000;padding-bottom:4px;transition:all .15s}.login-tab:hover{color:var(--text-primary)}.login-tab.on{color:var(--accent);border-bottom-color:var(--accent);font-weight:600}.login-inp{border:1px solid var(--border);background:var(--bg-input);width:100%;color:var(--text-primary);border-radius:6px;outline:none;margin-bottom:10px;padding:10px 12px;font-size:14px}.login-inp:focus{border-color:var(--accent)}.login-btn{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:6px;width:100%;margin-top:4px;padding:10px;font-size:14px;font-weight:600}.login-btn:hover{opacity:.9}.login-err{color:var(--accent-error);text-align:center;margin:0 0 6px;font-size:12px;display:none}@media (width<=540px){.login-box{flex-direction:column}.login-left{width:100%;padding:20px}.login-right{padding:24px 20px}}.ws-preset-btn{border:1px solid var(--border);background:var(--bg-card);color:var(--text-secondary);cursor:pointer;font-size:11px;font-family:var(--font-mono);border-radius:12px;padding:3px 9px;transition:all .12s}.ws-preset-btn:hover{border-color:var(--accent);color:var(--accent);background:var(--bg-nav)}@media (width<=900px){.workshop-layout{flex-direction:column;height:auto}.workshop-sidebar{border-right:none;border-bottom:1px solid var(--border);width:100%;min-width:0;max-height:50vh}}.practice-page{max-width:780px;margin:0 auto;padding:32px 20px 64px}.practice-header{text-align:center;margin-bottom:32px}.practice-header h1{margin:8px 0 16px;font-size:24px}.practice-topic-select{align-items:center;gap:8px;margin-bottom:16px;display:flex}.practice-back{color:var(--text-muted);margin-bottom:4px;font-size:13px;text-decoration:none;display:inline-block}.practice-back:hover{color:var(--accent)}.practice-steps{justify-content:center;align-items:center;gap:8px;display:flex}.practice-step{color:var(--text-muted);border-radius:20px;padding:4px 12px;font-size:13px;transition:all .2s}.practice-step.active{background:var(--accent);color:#fff}.practice-step.done{color:var(--accent-correct)}.practice-step-arrow{color:var(--text-muted);font-size:12px}.practice-toolbar{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;margin-bottom:16px;display:flex}.practice-filter{gap:4px;display:flex}.filter-chip{border:1px solid var(--border);cursor:pointer;background:var(--bg-card);color:var(--text-secondary);border:1px solid var(--border);font-size:12px;font-family:var(--font-body);border-radius:20px;padding:5px 14px;transition:all .15s}.filter-chip:hover{border-color:var(--accent);color:var(--accent)}.filter-chip.active{background:var(--accent);color:#fff;border-color:var(--accent)}.practice-actions{gap:8px;display:flex}.practice-problem-list{flex-direction:column;gap:4px;display:flex}.practice-problem-card{border:1px solid var(--border);cursor:pointer;background:var(--bg-card);border-radius:8px;align-items:center;gap:12px;padding:14px 16px;transition:all .12s;display:flex}.practice-problem-card:hover{border-color:var(--accent);background:var(--bg-nav)}.ppc-difficulty{text-align:center;flex-shrink:0;width:40px;font-size:13px}.ppc-easy{color:var(--accent-correct)}.ppc-medium{color:var(--accent-warm)}.ppc-hard{color:var(--accent-error)}.ppc-basic{color:var(--accent-correct)}.ppc-advanced{color:var(--accent)}.ppc-exam{color:var(--accent-warm)}.ppc-graduate{color:#a45050}.ppc-phd{color:#a45050;font-weight:700}.ppc-body{flex:1;min-width:0}.ppc-id{color:var(--text-muted);font-size:12px}.ppc-preview{margin-top:2px;font-size:14px;display:block}.ppc-arrow{color:var(--text-muted);font-size:18px}.practice-empty{text-align:center;color:var(--text-muted);padding:40px;font-size:14px}.practice-solve-card{background:var(--bg-card);border:1px solid var(--border);border-radius:10px;margin-bottom:16px;padding:24px}.psc-meta{align-items:center;gap:12px;margin-bottom:12px;display:flex}.psc-problem{font-size:16px;line-height:1.8}.practice-upload{border:2px dashed var(--border);text-align:center;cursor:pointer;background:var(--bg-card);border-radius:12px;padding:40px 20px;transition:all .15s}.practice-upload:hover{border-color:var(--accent);background:var(--bg-nav)}.practice-upload-icon{color:var(--text-muted);margin-bottom:8px;font-size:32px}@media (width<=768px){.gallery-grid{grid-template-columns:1fr;padding:16px}.exhibit-hero{padding:32px 16px}.exhibit-hero h1{font-size:24px}.exhibit-content{padding:20px 16px}.chat-popup{border-radius:12px;width:calc(100vw - 16px);height:calc(100vh - 120px);bottom:80px;right:8px}.chat-float-btn{bottom:16px;right:16px}.gaoshu-timeline{padding-left:12px}.gaoshu-subgrid{grid-template-columns:1fr}.exhibit-card-hero{min-height:240px!important}}.exhibit-card-topics{flex-wrap:wrap;gap:6px;margin-top:10px;display:flex}.exhibit-card-topics span{color:#ffffffe6;font-size:11px;font-family:var(--font-mono);background:#ffffff26;border-radius:10px;padding:2px 10px}.gaoshu-timeline{border-left:2px solid var(--border);margin:0 0 0 8px;padding-left:24px;position:relative}.timeline-item{opacity:0;margin-bottom:24px;padding-left:32px;transition:opacity .5s;position:relative}.timeline-dot{text-align:center;background:var(--accent);color:#fff;width:44px;font-size:11px;font-weight:600;font-family:var(--font-heading);border-radius:10px;margin-left:-24px;padding:3px 6px;position:absolute;top:0;left:-24px;transform:translate(-50%)}.timeline-content{padding-bottom:4px}.timeline-content strong{font-family:var(--font-heading);color:var(--text-primary);font-size:15px}.timeline-content p{color:var(--text-secondary);margin:4px 0 0;font-size:13px;line-height:1.6}.gaoshu-subgrid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px;margin:16px 0;display:grid}.gaoshu-subcard{background:var(--bg-card);border:1px solid var(--border);color:var(--text-primary);box-shadow:var(--shadow-card);border-radius:12px;align-items:flex-start;gap:16px;padding:24px;text-decoration:none;transition:all .2s;display:flex;position:relative;overflow:hidden}.gaoshu-subcard:hover{border-color:var(--accent);box-shadow:var(--shadow-elevated);color:var(--text-primary);text-decoration:none;transform:translateY(-2px)}.gaoshu-subcard-icon{background:var(--bg-nav);border-radius:12px;flex-shrink:0;justify-content:center;align-items:center;width:56px;height:56px;font-size:40px;display:flex}.gaoshu-subcard-body h3{font-family:var(--font-heading);border:none;margin:0 0 6px;padding:0;font-size:16px}.gaoshu-subcard-body p{color:var(--text-secondary);margin:0;font-size:13px}.gaoshu-subcard-order{color:var(--text-muted);opacity:.08;font-size:48px;font-weight:800;font-family:var(--font-heading);pointer-events:none;position:absolute;top:16px;right:20px}.gaoshu-subcard:first-child .gaoshu-subcard-icon{color:#1a5276;background:#e8f0f8}.gaoshu-subcard:nth-child(2) .gaoshu-subcard-icon{color:#4a2c6e;background:#f0e8f8}.gaoshu-subcard:nth-child(3) .gaoshu-subcard-icon{color:#0d4a3a;background:#e0f4ee}.gaoshu-subcard:nth-child(4) .gaoshu-subcard-icon{color:#6b2a2a;background:#f8e8e8}.gaoshu-subcard:nth-child(5) .gaoshu-subcard-icon{color:#1a406b;background:#e0ecf8}[data-theme=dark] .gaoshu-subcard:first-child .gaoshu-subcard-icon{color:#4a8ab6;background:#1a2a3e}[data-theme=dark] .gaoshu-subcard:nth-child(2) .gaoshu-subcard-icon{color:#8a5abe;background:#2a1a3e}[data-theme=dark] .gaoshu-subcard:nth-child(3) .gaoshu-subcard-icon{color:#4a8a6e;background:#1a3e2e}[data-theme=dark] .gaoshu-subcard:nth-child(4) .gaoshu-subcard-icon{color:#9a4a4a;background:#3e1a1a}[data-theme=dark] .gaoshu-subcard:nth-child(5) .gaoshu-subcard-icon{color:#4a6a9e;background:#1a2a3e}[data-theme=dark] .workshop-sidebar{background:#1e1c17}[data-theme=dark] .ws-mode-tab{background:#24211c}[data-theme=dark] .ws-mode-tab:hover{background:#2a2722}[data-theme=dark] .ws-preset-btn{background:#24211c}[data-theme=dark] .te-controls{background:#1e1c17}[data-theme=dark] .te-controls input[type=range]{background:#3a3530}[data-theme=dark] .te-explanation blockquote{background:#1e1c17}[data-theme=dark] .gaoshu-timeline{border-left-color:#3a3530}[data-theme=dark] .timeline-dot{box-shadow:0 0 0 3px #1a1814}[data-theme=dark] .exhibit-hero h1,[data-theme=dark] .exhibit-hero p{text-shadow:0 1px 4px #0006}.search-container{align-items:center;display:inline-flex;position:relative}.search-container input{width:0;color:var(--text-primary);background:0 0;border:1px solid #0000;border-radius:20px;outline:none;padding:4px 0;font-size:13px;transition:all .25s}.search-container.open input{border-color:var(--border);background:var(--bg-input);width:200px;padding:4px 12px}.search-btn{cursor:pointer;color:var(--text-secondary);background:0 0;border:none;padding:4px 8px;font-size:16px}.search-results{background:var(--bg-card);border:1px solid var(--border);width:360px;max-height:400px;box-shadow:var(--shadow-elevated);z-index:200;border-radius:8px;margin-top:4px;display:none;position:absolute;top:100%;right:0;overflow-y:auto}.search-results.show{display:block}.search-result-item{border-bottom:1px solid var(--border);color:var(--text-primary);padding:10px 14px;font-size:13px;text-decoration:none;transition:background .1s;display:block}.search-result-item:hover{background:var(--bg-nav);text-decoration:none}.search-result-item:last-child{border-bottom:none}.search-result-item .sr-title{font-weight:600;font-family:var(--font-heading)}.search-result-item .sr-excerpt{color:var(--text-muted);margin-top:2px;font-size:11px}.search-no-results{text-align:center;color:var(--text-muted);padding:16px;font-size:13px}@media (width<=768px){.search-results{width:280px;right:-40px}.gallery-grid{grid-template-columns:1fr;padding:16px}.exhibit-hero{padding:32px 16px}.exhibit-hero h1{font-size:24px}.exhibit-content{padding:20px 16px}.chat-popup{border-radius:12px;width:calc(100vw - 16px);height:calc(100vh - 120px);bottom:80px;right:8px}.chat-float-btn{bottom:16px;right:16px}.museum-nav{white-space:nowrap;-webkit-overflow-scrolling:touch;justify-content:flex-start;gap:2px;padding:6px 8px;overflow-x:auto}.museum-nav a{padding:4px 10px;font-size:12px}.museum-nav .nav-sep{display:none}.gaoshu-timeline{margin-left:0;padding-left:12px}.timeline-item{margin-bottom:16px;padding-left:24px}.timeline-dot{width:38px;margin-left:-18px;padding:2px 4px;font-size:10px;left:-18px;transform:translate(-50%)}.timeline-content p{font-size:12px}.gaoshu-subgrid{grid-template-columns:1fr}.gaoshu-subcard{gap:12px;padding:16px}.gaoshu-subcard-icon{width:44px;height:44px;font-size:28px}.exhibit-card-hero{min-height:220px!important}.exhibit-card-body h2{font-size:18px!important}.exhibit-card-topics span{padding:1px 7px;font-size:10px}.te-header{flex-direction:column;gap:8px;padding:14px}.te-controls{gap:8px;padding:8px 14px}.te-reveal{padding:8px 14px 14px}.te-plot{min-height:280px}.workshop-layout{flex-direction:column;height:auto}.workshop-sidebar{border-right:none;border-bottom:1px solid var(--border);width:100%;min-width:0;max-height:none;padding:16px}.workshop-main{padding:16px}.workshop-plot-area{min-height:380px}.exhibit-actions{padding:0 0 32px}#fractalCanvas{max-height:400px;width:100%!important}.practice-page{padding:16px 12px 48px}.practice-problem-card{padding:12px}.ppc-difficulty{width:32px}#dailyProblem{margin:0 12px 16px;padding:16px}}