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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 - 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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}}.skeleton{background:linear-gradient(90deg, var(--bg-nav) 25%, var(--border) 50%, var(--bg-nav) 75%);border-radius:var(--radius);background-size:200% 100%;animation:1.5s infinite shimmer}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.skeleton-text{width:100%;height:14px;margin:8px 0}.skeleton-text.short{width:60%}.skeleton-title{width:70%;height:24px;margin:12px 0}.skeleton-block{height:120px;margin:12px 0}.skeleton-card{border-radius:var(--radius-lg);height:200px}.skip-link{z-index:1000;background:var(--accent);color:#fff;border-radius:0 0 6px 6px;padding:8px 16px;font-size:13px;text-decoration:none;transition:top .2s;position:absolute;top:-40px;left:8px}.skip-link:focus{top:0}.lang-switch{letter-spacing:.5px;border-color:var(--accent);width:auto;color:var(--accent);padding:0 10px;font-size:12px;font-weight:600}.back-top{z-index:50;border:1px solid var(--border);background:var(--bg-card);width:40px;height:40px;color:var(--text-secondary);cursor:pointer;border-radius:50%;justify-content:center;align-items:center;transition:all .2s;display:flex;position:fixed;bottom:32px;right:32px;box-shadow:0 2px 8px #00000014}.back-top:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-2px);box-shadow:0 4px 14px #0000001f}.hamburger{font-size:18px;display:none}.nav-overlay{display:none}@media (width<=768px){.hamburger{display:inline-flex}.museum-nav{background:var(--bg-card);border-bottom:1px solid var(--border);z-index:100;flex-direction:column;max-height:calc(100vh - 48px);padding:8px 0;display:none;position:absolute;top:48px;left:0;right:0;overflow-y:auto}.museum-nav.nav-open{display:flex}.museum-nav .nav-sep{display:none}.museum-nav a{border:none;border-radius:0;padding:10px 20px}.nav-overlay{z-index:99;background:#0000004d;display:block;position:fixed;inset:0}}@media (width<=480px){.app-subtitle{display:none}.header-left{gap:8px}.app-brand{letter-spacing:.2px;font-size:15px}}