.brain-chat-screen{height:100%;min-height:0;color:var(--web-text);background:var(--web-surface);flex-direction:column;display:flex}.brain-chat-header{flex-shrink:0;justify-content:space-between;align-items:center;gap:20px;padding:16px 28px 10px;display:flex}.brain-chat-course{align-items:center;gap:10px;min-width:0;display:flex}.brain-chat-course>div{min-width:0}.brain-chat-course h1{letter-spacing:-.5px;font-size:19px;font-weight:600;line-height:1.4}.brain-chat-course p{color:var(--web-muted);white-space:nowrap;text-overflow:ellipsis;margin-top:2px;font-size:12px;overflow:hidden}.brain-chat-header-actions{flex-shrink:0;gap:6px;display:flex}.brain-chat-header-button{min-height:36px;color:var(--web-muted);background:0 0;border:0;border-radius:9px;align-items:center;gap:7px;padding:8px 11px;font-size:13px;display:inline-flex}.brain-chat-header-button:disabled{opacity:.4;cursor:not-allowed}.brain-chat-mode-bar{flex-shrink:0;justify-content:space-between;align-items:center;gap:12px;padding:8px 32px 12px;display:flex}.brain-chat-mode-switch{gap:3px;display:inline-flex}.brain-chat-mode-switch button{min-height:34px;color:var(--web-muted);background:0 0;border:0;border-radius:8px;padding:7px 11px;font-size:13px}.brain-chat-mode-switch button[aria-pressed=true]{background:color-mix(in srgb, var(--web-text) 7%, transparent);color:var(--web-text);font-weight:600}.brain-chat-mode-switch button:disabled{opacity:.6;cursor:not-allowed}.brain-chat-context{color:var(--web-muted);text-align:right;align-items:center;gap:6px;font-size:12px;display:inline-flex}.brain-chat-conversation{flex:1;min-height:0;display:flex;position:relative;overflow:hidden}.brain-chat-scroll{overscroll-behavior:contain;scrollbar-gutter:stable both-edges;flex:1;min-width:0;min-height:0;position:relative;overflow-y:auto}.brain-chat-thread{width:100%;max-width:840px;min-height:100%;margin:0 auto;padding:28px 32px 48px}.brain-chat-thread.is-empty{flex-direction:column;justify-content:center;display:flex}.brain-chat-welcome{text-align:center;padding:28px 0 40px}.brain-chat-welcome-icon{margin-bottom:20px;display:inline-flex}.brain-chat-welcome h2{letter-spacing:-1px;font-size:clamp(24px,2.4vw,31px);font-weight:600;line-height:1.4}.brain-chat-welcome>p{color:var(--web-muted);text-wrap:pretty;max-width:500px;margin:12px auto 0;font-size:14px;line-height:1.8}.brain-chat-suggestions{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-top:32px;display:grid}.brain-chat-suggestions button{text-align:left;border:1px solid color-mix(in srgb, var(--web-text) 12%, transparent);color:var(--web-muted);background:0 0;border-radius:15px;justify-content:space-between;align-items:flex-start;gap:12px;padding:15px;font-size:13px;line-height:1.7;display:flex}.brain-chat-suggestions button>.web-icon{flex-shrink:0;margin-top:3px}.brain-chat-state-actions{flex-wrap:wrap;justify-content:center;gap:8px;display:flex}.brain-chat-turn{min-width:0;margin-bottom:38px}.brain-chat-answer-label{align-items:center;gap:8px;margin-bottom:16px;font-size:13px;font-weight:600;display:flex}.brain-chat-answer-label>span:last-child:not(.web-icon){color:var(--web-muted);margin-left:2px;font-size:11px;font-weight:400}.brain-chat-turn-user{justify-content:flex-end;margin-top:8px;display:flex}.brain-chat-question{background:color-mix(in srgb, var(--web-text) 6%, var(--web-surface));overflow-wrap:anywhere;border-radius:22px;width:fit-content;max-width:85%;padding:12px 19px;font-size:15px;line-height:1.8}.brain-chat-answer{overflow-wrap:anywhere;min-width:0}.brain-chat-answer a{color:inherit;text-underline-offset:3px}.brain-chat-answer>div{max-width:100%}.brain-agent-activity{color:var(--web-muted);margin:-2px 0 16px;font-size:12px;line-height:1.8}.brain-agent-activity summary{cursor:pointer;width:fit-content}.brain-agent-activity ol{margin-top:8px;padding-left:22px}.brain-chat-response-status{color:var(--web-muted);margin:12px 0;font-size:13px}.brain-chat-response-status.is-streaming{align-items:center;gap:10px;display:flex}.brain-chat-thinking-dot{background:var(--web-text);border-radius:50%;width:8px;height:8px;animation:1.4s ease-in-out infinite brain-chat-pulse;display:inline-block}@keyframes brain-chat-pulse{50%{opacity:.35}}.brain-chat-error{color:var(--web-danger);border-left:2px solid var(--web-danger);margin:16px 0;padding-left:12px}.brain-chat-error p{margin-bottom:8px}.brain-chat-sources{flex-wrap:wrap;align-items:center;gap:8px;margin-top:20px;display:flex}.brain-chat-sources h3{color:var(--web-muted);margin-right:2px;font-size:12px;font-weight:400}.brain-chat-sources button{border:1px solid color-mix(in srgb, var(--web-text) 12%, transparent);color:var(--web-muted);text-align:left;background:0 0;border-radius:8px;align-items:center;gap:6px;max-width:100%;padding:5px 9px;font-size:12px;line-height:1.6;display:inline-flex}.brain-chat-sources button>.web-icon{flex-shrink:0}.brain-chat-sources button[aria-expanded=true]{color:var(--web-text);background:var(--web-surface-muted)}.brain-chat-text-button{color:var(--web-text);text-align:left;text-underline-offset:3px;background:0 0;border:0;padding:2px 0;font-size:13px;line-height:1.6;text-decoration:underline}.brain-chat-answer-actions{margin-top:14px}.brain-chat-copy-button{min-width:32px;min-height:32px;color:var(--web-muted);background:0 0;border:0;border-radius:7px;align-items:center;gap:6px;padding:6px;font-size:12px;display:inline-flex}.brain-chat-source-detail{border-left:2px solid var(--web-border);margin-top:16px;padding-left:16px}.brain-chat-source-detail>p{color:var(--web-muted);white-space:pre-wrap;margin-bottom:10px}.brain-chat-page-preview{border:1px solid var(--web-border);background:var(--web-surface);border-radius:12px;margin:20px 0;overflow:hidden}.brain-chat-page-preview img{object-fit:contain;width:100%;max-height:420px;display:block}.brain-chat-page-preview>p{color:var(--web-muted);padding:24px;font-size:13px}.brain-chat-page-preview figcaption{border-top:1px solid var(--web-border);color:var(--web-muted);justify-content:space-between;align-items:center;gap:16px;padding:10px 16px;font-size:13px;display:flex}.brain-chat-page-preview figcaption button{flex-shrink:0}.brain-chat-video{border-top:1px solid var(--web-border);border-bottom:1px solid var(--web-border);align-items:center;gap:12px;margin:12px 0;padding:14px 0;display:flex;text-decoration:none!important}.brain-chat-video strong{color:var(--web-text);font-size:14px;font-weight:600;display:block}.brain-chat-video span span{margin-top:2px;font-size:13px;display:block}.brain-chat-jump{border:1px solid var(--web-border);background:var(--web-surface);width:36px;height:36px;color:var(--web-text);box-shadow:0 2px 8px color-mix(in srgb, var(--web-text) 8%, transparent);border-radius:50%;place-items:center;display:grid;position:absolute;bottom:12px;left:50%;transform:translate(-50%)}.brain-chat-composer{background:var(--web-surface);flex-shrink:0;padding:12px 32px 16px}.brain-chat-composer form{max-width:776px;margin:0 auto}.brain-chat-input-row{border:1px solid color-mix(in srgb, var(--web-text) 14%, transparent);background:var(--web-surface);box-shadow:0 3px 14px color-mix(in srgb, var(--web-text) 4%, transparent);border-radius:28px;align-items:flex-end;gap:10px;padding:9px 10px 9px 19px;display:flex}.brain-chat-input-row:focus-within{border-color:color-mix(in srgb, var(--web-text) 35%, transparent)}.brain-chat-input-row textarea{resize:none;width:100%;min-width:0;min-height:44px;max-height:200px;color:var(--web-text);background:0 0;border:0;outline:none;flex:1;padding:9px 0;font-size:15px;line-height:26px;overflow-y:auto}.brain-chat-input-row textarea::placeholder{color:var(--web-muted)}.brain-chat-input-row textarea:disabled{opacity:.65;cursor:not-allowed}.brain-chat-send-button{background:var(--web-text);width:44px;height:44px;color:var(--web-surface);border:0;border-radius:50%;flex-shrink:0;place-items:center;padding:0;display:grid}.brain-chat-send-button:disabled{opacity:.22;cursor:not-allowed}.brain-chat-input-help{color:var(--web-muted);text-align:center;flex-wrap:wrap;justify-content:center;gap:3px 14px;margin-top:9px;font-size:11px;line-height:1.7;display:flex}.brain-chat-keyboard-hint{white-space:nowrap}.brain-chat-announcement,.brain-chat-sr-only{clip-path:inset(50%);white-space:nowrap;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.brain-chat-screen :is(button,summary):focus-visible{outline:2px solid var(--web-text);outline-offset:3px}@media (hover:hover){.brain-chat-header-button:not(:disabled):hover,.brain-chat-copy-button:hover,.brain-chat-mode-switch button:not(:disabled):hover,.brain-chat-sources button:hover,.brain-chat-suggestions button:hover{background:color-mix(in srgb, var(--web-text) 5%, transparent);color:var(--web-text)}.brain-chat-send-button:not(:disabled):hover{opacity:.85}}@media (width<=650px){.brain-chat-header{gap:10px;padding:13px 16px 7px}.brain-chat-course{gap:4px}.brain-chat-course h1{font-size:17px}.brain-chat-header-button{gap:5px;padding:7px;font-size:12px}.brain-chat-header-actions{gap:2px}.brain-chat-mode-bar{padding:7px 20px 10px}.brain-chat-context{font-size:11px}.brain-chat-thread{padding:20px 20px 32px}.brain-chat-welcome{padding:20px 0}.brain-chat-welcome h2{font-size:25px}.brain-chat-suggestions{grid-template-columns:1fr;gap:8px;max-width:420px;margin:24px auto 0}.brain-chat-suggestions button{align-items:center;padding:11px 14px}.brain-chat-turn{margin-bottom:28px}.brain-chat-question{max-width:92%;padding:11px 16px}.brain-chat-answer-label>span:last-child:not(.web-icon){font-size:10px}.brain-chat-composer{padding:10px 16px 12px}.brain-chat-input-row{padding-left:16px}.brain-chat-keyboard-hint{display:none}.brain-chat-page-preview figcaption{padding:10px}}@media (prefers-reduced-motion:reduce){.brain-chat-thinking-dot{animation:none}}