/* Bloom option 05: sources and their answer share one topic card. */
#msg-body>.bt-card,#msg-body>.bt-human-reply{flex-shrink:0}
.bt-back{display:none}
.bt-answer .mr-tx>.mr-who{display:flex;justify-content:flex-end;gap:8px;font-size:12px;font-weight:400;color:var(--sub,#6f6f7b);margin:0 0 8px}
.bt-answer .mr-tx>.mr-who>span{display:none}
.bt-card{max-width:850px;width:100%;margin:18px auto 26px;border:1px solid var(--line,#e8e8ec);border-radius:20px;background:#fff;color:var(--ink,#161620);overflow:hidden;scroll-margin:18px;box-shadow:0 5px 22px #16162005}
.bt-heading{padding:22px 26px 20px;display:flex;gap:18px;align-items:flex-start;justify-content:space-between}.bt-heading>div{min-width:0}.bt-eyebrow{font-size:12px;font-weight:600;color:var(--sub,#6f6f7b);letter-spacing:.08em}.bt-heading h3{font-size:18px;line-height:1.6;margin:5px 0 8px;font-weight:700;overflow-wrap:anywhere}.bt-heading time{font-size:12px;color:var(--sub,#6f6f7b)}.bt-badge{white-space:nowrap;color:var(--green,#1b7a53);background:var(--green-soft,#ecfaf3);border:1px solid var(--green-line,#c9ecdb);font-size:12px;border-radius:20px;padding:6px 10px;margin-top:5px}
.bt-sources{margin:0 26px;padding:17px 18px;border-radius:12px;background:var(--bg,#f8f8fa);border:1px solid var(--line,#e8e8ec)}.bt-source-label{font-size:12px;color:var(--sub,#6f6f7b);display:flex;gap:8px;margin-bottom:12px}.bt-source-label b{font-weight:600;color:var(--ink-2,#3a3a45)}.bt-source+.bt-source{border-top:1px solid var(--line,#e8e8ec);margin-top:12px;padding-top:12px}.bt-source summary{cursor:pointer;list-style:none}.bt-source summary::-webkit-details-marker{display:none}.bt-source-meta{display:flex;gap:10px;flex-wrap:wrap;font-size:12px;font-weight:650;align-items:center}.bt-source-meta time,.bt-source-meta>span{color:var(--sub,#6f6f7b);font-weight:400}.bt-excerpt{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;font-size:14px;line-height:1.75;margin:7px 0;white-space:pre-wrap;overflow-wrap:anywhere}.bt-source-toggle{font-size:12px;color:var(--brand-ink,#a8365c)}.bt-source-toggle::after{content:' ＋'}.bt-source[open] .bt-source-toggle::after{content:' −'}.bt-source[open] .bt-excerpt{display:none}.bt-original{padding-top:12px;font-size:14px;line-height:1.85;white-space:pre-wrap;overflow-wrap:anywhere}.bt-original button{display:block;margin-top:12px}.bt-note,.bt-file{font-size:12px;color:var(--sub,#6f6f7b);margin:8px 0}
.bt-answer{padding:24px 26px 18px}.bt-answer-label{display:flex;align-items:center;gap:9px;margin-bottom:14px;font-size:14px}.bt-answer-label span{margin-left:auto;color:var(--green,#1b7a53);font-size:12px}.bt-answer .dm-row,.bt-answer .msg-row{margin:0;padding:0;display:block;width:100%;max-width:none}.bt-answer .mr-av,.bt-answer .mr-who{display:none}.bt-answer .dm-b,.bt-answer .mr-tx{display:block;width:100%;max-width:none;background:transparent!important;border:0;border-radius:0;padding:0;box-shadow:none;color:var(--ink,#161620)!important;font-size:15px;line-height:1.9;text-align:left;overflow-wrap:anywhere}.bt-answer .dm-b>time{margin-top:16px;color:var(--sub,#6f6f7b)}.bt-answer .re-row{margin-top:14px}.bt-footer{border-top:1px solid var(--line,#e8e8ec);padding:14px 26px;display:flex;gap:15px;align-items:center}.bt-footer>span{font-size:12px;color:var(--sub,#6f6f7b)}.bt-card button,.bt-topic-nav button{font-family:inherit;border:1px solid var(--line,#e8e8ec);background:#fff;color:var(--brand-ink,#a8365c);border-radius:8px;padding:8px 12px;min-height:40px;cursor:pointer;font-size:13px}.bt-footer button{display:inline-flex;gap:8px;align-items:center;border-color:var(--brand-line,#f7d4e1);background:var(--brand-soft,#fff2f6);font-weight:600}.bt-card button:hover,.bt-topic-nav button:hover{border-color:var(--brand,#c7406d)}.bt-footer svg,.bt-quote svg,.bt-compose-context svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.7;flex:none}
.bt-topic-nav{display:flex;gap:8px;align-items:center;padding:11px 22px;border-bottom:1px solid var(--line,#e8e8ec);background:#fff;overflow-x:auto;flex-shrink:0;scrollbar-width:thin}.bt-topic-nav>span{flex:none;font-size:12px;color:var(--sub,#6f6f7b);padding-right:5px}.bt-topic-nav button{flex:none;max-width:240px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--ink-2,#3a3a45);border-radius:20px;min-height:34px;padding:6px 12px;font-size:12px}.bt-covered{display:none!important}.bt-quote{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--sub,#6f6f7b);max-width:650px;margin:10px 0 5px;overflow-wrap:anywhere}.bt-human-reply:has(.me) .bt-quote{margin-left:auto;justify-content:flex-end}.bt-original-visible{outline:2px solid var(--brand-line,#f7d4e1);outline-offset:4px}
.bt-compose-context{margin:0 20px 6px;padding:11px 13px;border:1px solid var(--brand-line,#f7d4e1);border-radius:10px;background:var(--brand-soft,#fff2f6);color:var(--brand-ink,#a8365c);display:flex;align-items:center;justify-content:space-between;font-size:12px;gap:12px}.bt-compose-context>span{display:flex;gap:8px;align-items:center;min-width:0}.bt-compose-context span>span{overflow:hidden;white-space:nowrap;text-overflow:ellipsis}.bt-compose-context b{white-space:nowrap}.bt-compose-context button{border:0;background:transparent;font-size:22px;min-width:36px;min-height:36px;color:inherit;cursor:pointer}.bt-card:focus-visible,.bt-card summary:focus-visible,.bt-card button:focus-visible,.bt-topic-nav button:focus-visible,.bt-compose-context button:focus-visible{outline:2px solid var(--brand,#c7406d);outline-offset:3px}
@media(max-width:650px){.bt-card{margin:12px 0 20px;border-radius:15px}.bt-heading{padding:17px 16px;gap:10px}.bt-heading h3{font-size:16px}.bt-badge{font-size:11px;padding:5px 8px}.bt-sources{margin:0 14px;padding:13px}.bt-answer{padding:20px 16px 14px}.bt-answer-label{flex-wrap:wrap;font-size:13px}.bt-answer-label span{margin-left:32px;width:100%}.bt-answer .dm-b,.bt-answer .mr-tx{font-size:14px}.bt-footer{padding:13px 16px}.bt-footer>span{display:none}.bt-topic-nav{padding:9px 12px}.bt-compose-context{margin:0 10px 6px}.bt-compose-context>span{flex-wrap:wrap}.bt-compose-context span>span{width:100%}}
@media(prefers-reduced-motion:reduce){.bt-card{scroll-behavior:auto}}
@media(max-width:650px){
 #view-messages.on.bt-mobile-thread #msg-thread{position:fixed;inset:48px 0 0;z-index:30;height:calc(100dvh - 48px);max-height:none;background:#fff;border-radius:0;overflow:hidden}
 #view-messages.on.bt-mobile-thread .msg-body{max-height:none;min-height:0;padding:12px;overscroll-behavior:contain}
 #view-messages.on.bt-mobile-thread .msg-hd{flex-shrink:0;padding:12px 10px;gap:8px}
 #view-messages.on.bt-mobile-thread .msg-send{flex-shrink:0;padding:10px 10px max(10px,env(safe-area-inset-bottom))}
 #view-messages.on.bt-mobile-thread .msg-hint{display:none}
 #view-messages.on:not(.bt-mobile-thread) #msg-thread{display:none}
 .bt-back{display:inline-flex;align-items:center;justify-content:center;flex:none;width:34px;height:40px;border:0;background:#fff;color:var(--ink,#161620);cursor:pointer;border-radius:8px}
 .bt-back svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.8}
}