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.banner{margin:0;flex-shrink:0}.chat{flex:1;min-height:0;height:auto;max-height:none}.chat-head{flex-shrink:0;padding:12px 16px}.chat-head .mini-orb{display:block;width:36px;height:36px}.chat-clear{margin-left:auto}.chat-body{min-height:0;overscroll-behavior:contain}.chat-empty .big-orb{display:block}.chat-empty h3{margin-bottom:6px}.msg .who{font-size:11px}.bubble-wrap{min-width:0;display:flex;flex-direction:column;gap:6px;align-items:flex-start}.msg.user .bubble-wrap{align-items:flex-end}.bubble .pre{white-space:pre-wrap;margin:0}.bubble.err{background:var(--danger-bg)!important;color:var(--danger);border-color:transparent!important}.bubble .md-h{font-weight:700;color:var(--text)}.based-on{display:flex;gap:6px;align-items:flex-start;font-size:12px;color:var(--official);font-weight:600;line-height:1.4}.based-on app-icon{width:14px;height:14px;margin-top:1px}.tools{flex-shrink:0;display:flex;gap:8px;padding:10px 12px 0;overflow-x:auto;scrollbar-width:none;border-top:1px solid var(--border)}.tools::-webkit-scrollbar{display:none}.tool{display:inline-flex;align-items:center;gap:6px;flex-shrink:0;height:36px;padding:0 12px;border-radius:10px;border:1px solid var(--border);background:var(--surface);color:var(--text-2);font-size:13.5px;font-weight:600;cursor:pointer;transition:.18s var(--ease)}.tool app-icon{width:16px;height:16px;color:var(--primary)}.tool:hover:not([disabled]){border-color:var(--primary-2);color:var(--primary);transform:translateY(-1px)}.tool.on{background:var(--grad);color:#fff;border-color:transparent}.tool.on app-icon{color:#fff}.tool[disabled]{opacity:.5;cursor:not-allowed}.chat-input{flex-shrink:0;border-top:0}.chat-input textarea{min-height:48px;max-height:140px}.chat-input .send{height:48px;flex-shrink:0}.ws-side{overflow-y:auto;display:flex;flex-direction:column;gap:14px;padding-right:4px;scrollbar-width:thin;overscroll-behavior:contain}.ws-side .side-card{flex-shrink:0}.overview{color:var(--text-2);font-size:14px;margin-bottom:4px}.topic-chips{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:6px}.topic-chip{display:inline-flex;align-items:center;gap:6px;padding:6px 11px;border-radius:999px;border:1px solid var(--border);background:var(--surface-2);color:var(--text-2);font-size:13px;font-weight:500;cursor:pointer;text-align:left;transition:.18s var(--ease);min-height:34px}.topic-chip:hover{border-color:var(--primary-2);color:var(--primary);transform:translateY(-1px)}.topic-chip.done{background:var(--success-bg);color:var(--success);border-color:transparent}.topic-chip app-icon{width:14px;height:14px}.side-card .bar{margin:6px 0 4px}.ins-label{font-size:11.5px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--text-3);margin:16px 0 6px}.ins-list{margin:0;padding-left:18px;color:var(--text-2);font-size:14px;display:grid;gap:3px}.insight-item app-icon{width:16px;height:16px}.insight-item[disabled]{opacity:.5;cursor:not-allowed}.side-card h3 app-icon{width:17px;height:17px;color:var(--primary)}.book-q{display:flex;flex-direction:column;align-items:flex-start;gap:6px;width:100%;text-align:left;padding:10px 12px;margin-top:8px;border-radius:12px;border:1px solid var(--border);background:var(--surface-2);color:var(--text);font-size:14px;line-height:1.45;cursor:pointer;transition:.18s var(--ease)}.book-q:hover{border-color:var(--primary-2);transform:translate(2px)}.book-q .chip{height:22px;font-size:11px}.pyq-note{margin-top:16px;padding-top:14px;border-top:1px dashed var(--border-strong)}.pyq-note p{margin:8px 0 0}@media (max-width: 1180px){.ws{grid-template-columns:minmax(0,1fr) 300px;grid-template-rows:auto minmax(0,1fr);gap:12px 16px}.chap-nav{grid-column:1 / -1}.chap-nav .nav-label{display:none}.chap-nav-list{flex-direction:row;overflow-x:auto;overflow-y:hidden;padding:2px 2px 4px;gap:8px;scrollbar-width:none}.chap-nav-list::-webkit-scrollbar{display:none}.chap-link{max-width:230px;border:1px solid var(--border);background:var(--surface);padding:7px 12px}.chap-link .ct{-webkit-line-clamp:1;white-space:nowrap;display:block;text-overflow:ellipsis}.chap-link.active{background:var(--grad);color:#fff;border-color:transparent}.chap-link.active .cn{color:#fff}.chap-link.active:before{display:none}}@media (max-width: 900px){.ws{display:flex;flex-direction:column;padding:10px 12px 12px;gap:10px}.crumbs-mobile{display:flex;gap:6px;align-items:center;padding:0 16px 10px;font-size:13px;color:var(--text-3);overflow-x:auto;white-space:nowrap;scrollbar-width:none}.crumbs-mobile::-webkit-scrollbar{display:none}.crumbs-mobile a{color:var(--text-2)}.crumbs-mobile .current{color:var(--text);font-weight:600}.crumbs-mobile .sep{color:var(--border-strong)}.chap-nav{flex-shrink:0;margin:0 -12px}.chap-nav-list{padding:2px 12px}.mobile-switch{display:grid;grid-template-columns:1fr 1fr;gap:4px;flex-shrink:0;padding:4px;border-radius:14px;background:var(--surface-2);border:1px solid var(--border)}.mobile-switch button{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:38px;border:0;border-radius:10px;background:transparent;color:var(--text-2);font-weight:600;font-size:14px;cursor:pointer;transition:background .2s,color .2s}.mobile-switch button app-icon{width:16px;height:16px}.mobile-switch button.on{background:var(--surface);color:var(--primary);box-shadow:var(--shadow-sm)}.ws-center{flex:1}.ws-side{display:none;flex:1;padding-right:0}.ws.show-info .ws-center{display:none}.ws.show-info .ws-side{display:flex;animation:panelIn .3s var(--ease) both}.ws-bar{display:none}}@media (max-width: 600px){.ws-bar{padding:12px 14px}.chat-head{padding:10px 12px}.chat-head p{display:none}.chat-body{padding:14px 12px}.chat-input{padding:10px;gap:8px}.chat-input .send span{display:none}.chat-input .send{width:48px;padding:0}.chat-input textarea{font-size:16px}.msg{max-width:100%}.hero h1{font-size:2.1rem}.class-grid{grid-template-columns:1fr 1fr}.class-card{min-height:150px;padding:16px}.class-card .c-icon{right:12px;top:12px;width:34px;height:34px}.class-card .num{font-size:38px}.subj-grid,.chap-grid{grid-template-columns:1fr}}@media (max-width: 360px){.class-grid{grid-template-columns:1fr}}