:root{color-scheme:light;--bg:#f7f5ef;--panel:#fffdfa;--panel-strong:#f0eee6;--ink:#18221f;--muted:#68736f;--line:#ddd8ca;--brand:#1f6f68;--brand-dark:#16514d;--accent:#b8653b;--accent-soft:#f0dfd1;--ok:#28784a;--warn:#a05a00;--danger:#bd3b35;--shadow:0 18px 45px rgba(24,34,31,0.08)}*{box-sizing:border-box}body,html{min-height:100%}body{margin:0;background:var(--bg);color:var(--ink);font-family:Arial,Noto Sans TC,PingFang TC,Microsoft JhengHei,sans-serif}button,input,select,textarea{font:inherit}button{border:0}.app-shell{min-height:100vh;display:grid;grid-template-rows:auto 1fr}.topbar{min-height:64px;padding:12px 20px;justify-content:space-between;gap:16px;border-bottom:1px solid var(--line);background:rgba(255,253,250,.92);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);position:-webkit-sticky;position:sticky;top:0;z-index:20}.brand-lockup,.topbar{display:flex;align-items:center}.brand-lockup{gap:12px;min-width:0}.brand-mark{width:38px;height:38px;border-radius:8px;display:grid;place-items:center;color:#fffdfa;background:var(--brand);flex:0 0 auto}.brand-copy{min-width:0}.brand-title{margin:0;font-size:17px;line-height:1.2;font-weight:800}.brand-subtitle{margin:2px 0 0;color:var(--muted);font-size:12px;line-height:1.4}.topbar-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap;justify-content:flex-end}.token-input{width:min(280px,40vw);height:40px;border:1px solid var(--line);border-radius:8px;background:#fff;padding:0 12px;color:var(--ink)}.workspace{display:grid;grid-template-columns:minmax(290px,360px) minmax(0,1fr);min-height:calc(100vh - 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65px);display:grid;place-items:center;padding:24px;color:var(--muted);text-align:center}.empty-state strong{display:block;margin-bottom:6px;color:var(--ink)}.error-line{color:var(--danger);font-size:12px;line-height:1.4}@media (max-width:980px){.workspace{grid-template-columns:1fr}.sidebar{border-right:0;border-bottom:1px solid var(--line)}.conversation-list{height:280px}.content-grid{grid-template-columns:1fr;overflow:visible}.thread-pane{border-right:0;border-bottom:1px solid var(--line)}}@media (max-width:680px){.case-header,.topbar{align-items:stretch;flex-direction:column}.case-actions,.topbar-actions{justify-content:stretch}.case-actions>*,.topbar-actions>*{flex:1 1 auto}.token-input{width:100%}.search-row{grid-template-columns:1fr}.draft-pane,.thread-pane{padding:14px}}