:root{--border:#e5e3dc;--text:#2c2c2a;--dim:#6b6a65;--bg:#f7f7f5;--card:#fff;--blue:#185fa5}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif}.shell{grid-template-columns:260px 1fr;gap:16px;max-width:1180px;height:100vh;margin:0 auto;padding:20px;display:grid}.sidebar{background:var(--card);border:.5px solid var(--border);border-radius:12px;flex-direction:column;gap:10px;padding:14px;display:flex;overflow:auto}.session{cursor:pointer;border-radius:8px;padding:6px 8px!important}.session:hover{background:var(--bg)}.session.active{background:#e6f1fb}.session-title{text-overflow:ellipsis;white-space:nowrap;max-width:200px;font-size:13px;overflow:hidden}.session-meta{color:var(--dim);font-size:12px}.content{flex-direction:column;gap:12px;min-height:0;display:flex}.content-header{justify-content:space-between;align-items:center;display:flex}.chat-card{flex:1;min-height:0;overflow:auto}.messages{flex-direction:column;gap:12px;display:flex}.bubble{align-items:flex-start;gap:10px;display:flex}.bubble-role{color:var(--dim);flex:0 0 40px;padding-top:4px;font-size:12px}.bubble-body{background:var(--bg);white-space:pre-wrap;word-break:break-word;border-radius:10px;flex:1;padding:8px 12px;font-size:14px;line-height:1.65}.bubble.assistant .bubble-body{background:#e6f1fb}.caret{background:var(--blue);vertical-align:text-bottom;width:6px;height:14px;margin-left:2px;animation:1s steps(2,start) infinite blink;display:inline-block}@keyframes blink{to{visibility:hidden}}@media (prefers-reduced-motion:reduce){.caret{animation:none}}.composer{grid-template-columns:1fr auto;align-items:end;gap:10px;display:grid}.debug{color:var(--dim);font-size:12px}.debug pre{background:#f1efe8;border-radius:8px;padding:10px 12px;font-size:12px;line-height:1.6;overflow:auto}