:root{--bg: #ffffff;--sidebar-bg: #f5f5f7;--border: #e2e2e5;--text: #1c1c1e;--muted: #6b6b70;--accent: #3b6ef5;--user-bubble: #3b6ef5;--user-text: #ffffff;--assistant-bubble: #ececef;--assistant-text: #1c1c1e}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;color:var(--text);background:var(--bg)}.app,.shell{display:flex;height:100%}.rail{width:180px;flex-shrink:0;display:flex;flex-direction:column;gap:2px;padding:12px 8px;background:var(--sidebar-bg);border-right:1px solid var(--border)}.rail-brand{font-weight:700;font-size:15px;padding:6px 10px 12px}.rail-section{font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);padding:12px 10px 4px}.rail-link{display:block;padding:7px 10px;border-radius:7px;color:var(--text);text-decoration:none;font-size:14px}.rail-link:hover{background:#0000000d}.rail-link.active{background:#3b6ef51f;color:var(--accent);font-weight:600}.rail-spacer{flex:1}.rail-logout{font:inherit;font-size:12px;color:var(--muted);background:transparent;border:1px solid var(--border);border-radius:6px;padding:6px 8px;cursor:pointer}.rail-logout:hover{color:var(--text)}.shell-main{flex:1;min-width:0;overflow:hidden}.chat{display:flex;height:100%}.chat-main{flex:1;min-width:0;display:flex;flex-direction:column}.view,.detail{height:100%;overflow-y:auto;padding:24px 28px}.view-loading,.view-error,.view-empty{padding:32px;color:var(--muted)}.view-header{display:flex;align-items:baseline;gap:12px}.view-header h1{font-size:22px;margin:0}.view-count{color:var(--muted);font-size:13px}.collection-tabs{display:flex;gap:6px;margin:16px 0 8px;flex-wrap:wrap}.collection-tabs button{font:inherit;font-size:13px;padding:5px 12px;border-radius:999px;border:1px 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.thread-list-item-trigger{background:#3b6ef51f;color:var(--accent);font-weight:600}.main{flex:1;min-width:0;display:flex;flex-direction:column}.thread{display:flex;flex-direction:column;height:100%}.thread-viewport{flex:1;overflow-y:auto;padding:24px;display:flex;flex-direction:column;gap:12px}.thread-empty{margin:auto;color:var(--muted);font-size:15px}.message{display:flex}.message-user{justify-content:flex-end}.message-assistant{justify-content:flex-start}.message-bubble{max-width:70%;padding:10px 14px;border-radius:16px;font-size:15px;line-height:1.45;white-space:pre-wrap;word-wrap:break-word}.message-user .message-bubble{background:var(--user-bubble);color:var(--user-text);border-bottom-right-radius:4px}.message-assistant .message-bubble{background:var(--assistant-bubble);color:var(--assistant-text);border-bottom-left-radius:4px}.message-assistant 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