:root{--bg:#f5f7f8;--surface:#ffffff;--surface-soft:#eef3f1;--ink:#17211d;--muted:#68736f;--line:#dbe3df;--green:#176b55;--green-dark:#0f4d3d;--blue:#2869a6;--amber:#a15d11;--red:#b43434;--shadow:0 16px 44px rgba(23,33,29,0.08)}*{box-sizing:border-box}body{margin:0;min-height:100vh;height:100vh;overflow:hidden;color:var(--ink);background:linear-gradient(180deg,rgba(23,107,85,.08),rgba(245,247,248,0) 340px),var(--bg);font-family:Inter,PingFang SC,Microsoft YaHei,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,input,textarea{font:inherit}button{cursor:pointer}.app-shell{min-height:100vh;padding:28px}.chat-shell{display:flex;flex-direction:column;height:100vh;max-width:880px;margin:0 auto;background:var(--bg)}.chat-topbar{justify-content:space-between;gap:14px;padding:16px 20px;border-bottom:1px solid var(--line);background:rgba(255,255,255,.9)}.chat-title,.chat-topbar{display:flex;align-items:center}.chat-title{gap:12px}.chat-topbar 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