:root{--bg:#f6f7f9;--card:#ffffff;--text:#1a1c1f;--muted:#6b7280;--border:#e4e7ec;--accent:#2563eb;--accent-hover:#1d4ed8;--danger:#dc2626;--ok:#047857;--ok-bg:#ecfdf5;--shadow:0 4px 16px rgba(0,0,0,0.06);--radius:10px;--sidebar-w:232px;--sidebar-w-collapsed:64px}*{box-sizing:border-box;padding:0;margin:0}body,html{max-width:100vw;overflow-x:hidden}body{background:var(--bg);color:var(--text);font-family:Google Sans,Segoe UI,system-ui,-apple-system,sans-serif;font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}.app-shell{display:flex;min-height:100vh}.app-main{flex:1 1;min-width:0;display:flex;flex-direction:column}.app-content{padding:24px 28px;flex:1 1}.sidebar{width:var(--sidebar-w);background:var(--card);border-right:1px solid var(--border);display:flex;flex-direction:column;position:-webkit-sticky;position:sticky;top:0;height:100vh;transition:width .2s 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10px;display:flex;flex-direction:column;gap:8px}.chat-input{resize:none;min-height:44px;max-height:160px;line-height:1.45;padding:11px 14px}.chat-input-row{display:flex;align-items:center;justify-content:space-between;gap:12px}.chat-input-hint{font-size:12px}@media (max-width:900px){.chat-page{height:calc(100vh - 60px - 24px)}.chat-side{display:none}.chat-msg{max-width:94%}}