.brain-chat-screen{height:100%;min-height:420px;color:var(--web-text);background:var(--web-bg);flex-direction:column;display:flex}.brain-chat-header{border-bottom:1px solid var(--web-border);justify-content:space-between;align-items:center;gap:20px;padding:24px 32px 20px;display:flex}.brain-chat-course{align-items:center;gap:12px;min-width:0;display:flex}.brain-chat-course h1{letter-spacing:-.6px;font-size:22px;line-height:1.4}.brain-chat-course p{color:var(--web-muted);overflow-wrap:anywhere;margin-top:4px;font-size:14px}.brain-chat-header-actions{flex-shrink:0;gap:8px;display:flex}.brain-chat-context{color:var(--web-muted);border-bottom:1px solid var(--web-border);flex-wrap:wrap;justify-content:space-between;gap:4px 20px;padding:10px 32px;font-size:13px;display:flex}.brain-chat-scroll{overscroll-behavior:contain;scrollbar-gutter:stable;flex:1;min-height:0;overflow-y:auto}.brain-chat-thread{max-width:850px;margin:0 auto;padding:32px 36px 48px}.brain-chat-welcome{padding-top:clamp(20px,7vh,80px)}.brain-chat-welcome h2{letter-spacing:-.6px;font-size:24px}.brain-chat-welcome>p{color:var(--web-muted);max-width:540px;margin-top:12px;line-height:1.8}.brain-chat-suggestions{flex-direction:column;align-items:flex-start;gap:12px;margin-top:28px;display:flex}.brain-chat-suggestions button{text-align:left;background:var(--web-surface);border:1px solid var(--web-border);border-radius:var(--web-radius);color:var(--web-text);padding:11px 16px;line-height:1.6}.brain-chat-suggestions button:hover{border-color:var(--web-primary);color:var(--web-primary)}.brain-chat-state-actions{flex-wrap:wrap;justify-content:center;gap:8px;display:flex}.brain-chat-turn{min-width:0;margin-bottom:32px}.brain-chat-turn>h2{color:var(--web-muted);margin-bottom:10px;font-size:13px;font-weight:600}.brain-chat-turn-user{margin-left:12%}.brain-chat-question{background:var(--web-surface-muted);border-radius:var(--web-radius);white-space:pre-wrap;overflow-wrap:anywhere;padding:16px 20px;font-size:15px;line-height:1.8}.brain-chat-answer{overflow-wrap:anywhere;min-width:0}.brain-chat-answer a{color:var(--web-primary);text-underline-offset:3px;text-decoration:underline}.brain-chat-answer>div{max-width:100%}.brain-chat-response-status{color:var(--web-muted);margin:12px 0;font-size:13px}.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{border-top:1px solid var(--web-border);flex-wrap:wrap;align-items:baseline;gap:8px 16px;margin-top:16px;padding-top:14px;display:flex}.brain-chat-sources h3{color:var(--web-muted);font-size:13px;font-weight:500}.brain-chat-sources button,.brain-chat-text-button{color:var(--web-primary);text-align:left;background:0 0;border:0;padding:2px 0;font-size:13px;line-height:1.6}.brain-chat-sources button:hover,.brain-chat-text-button:hover,.brain-chat-sources button[aria-expanded=true]{text-underline-offset:3px;text-decoration:underline}.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);border-radius:var(--web-radius);background:var(--web-surface);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-composer{border-top:1px solid var(--web-border);background:var(--web-surface);flex-shrink:0;padding:16px 36px 20px}.brain-chat-composer form{max-width:778px;margin:0 auto}.brain-chat-composer label{margin-bottom:8px;font-size:13px;font-weight:600;display:block}.brain-chat-input-row{align-items:flex-end;gap:12px;display:flex}.brain-chat-input-row textarea{resize:vertical;border:1px solid var(--web-border);border-radius:var(--web-radius);background:var(--web-bg);width:100%;min-width:0;min-height:70px;max-height:180px;color:var(--web-text);flex:1;padding:11px 14px;font-size:15px;line-height:1.6}.brain-chat-input-row textarea:focus-visible{outline:2px solid var(--web-primary);outline-offset:2px}.brain-chat-input-row textarea:disabled{opacity:.7;cursor:not-allowed}.brain-chat-input-row .web-button{flex-shrink:0;min-width:82px;min-height:42px;margin-bottom:1px}.brain-chat-input-help{color:var(--web-muted);flex-wrap:wrap;justify-content:space-between;gap:4px 12px;margin-top:8px;font-size:13px;display:flex}.brain-chat-announcement{clip-path:inset(50%);white-space:nowrap;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}@media (width<=650px){.brain-chat-header{align-items:flex-start;gap:12px;padding:16px}.brain-chat-course{gap:4px}.brain-chat-course h1{font-size:19px}.brain-chat-course p{font-size:13px}.brain-chat-header-actions{gap:5px}.brain-chat-header-actions .web-button{padding:7px 9px;font-size:13px}.brain-chat-context{padding:8px 20px}.brain-chat-context span:last-child{display:none}.brain-chat-thread{padding:24px 20px 32px}.brain-chat-welcome{padding-top:16px}.brain-chat-welcome h2{font-size:21px}.brain-chat-turn-user{margin-left:5%}.brain-chat-composer{padding:12px 16px 16px}.brain-chat-input-row{gap:8px}.brain-chat-input-row .web-button{min-width:68px;padding:10px}.brain-chat-input-help{font-size:13px}.brain-chat-page-preview figcaption{padding:10px}}