:root{--bg:#ededed;--panel:#f7f7f7;--bubble-agent:#fff;--bubble-customer:#95ec69;--text:#191919;--muted:#6f6f6f;--border:#dcdcdc;--accent:#07c160;--accent-dark:#06a050;--warn-bg:#fff4d6;--warn-text:#7a5300;--danger:#d93025;--danger-bg:#fdecea;--demo:#c2410c;--tap:44px}*{box-sizing:border-box}html,body{height:100%;color:var(--text);-webkit-text-size-adjust:100%;background:#d6d6d6;margin:0;font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,Noto Sans SC,Segoe UI,sans-serif;font-size:15px}button{font:inherit;-webkit-tap-highlight-color:transparent}button:disabled{opacity:.5;cursor:not-allowed}.phone{background:var(--bg);flex-direction:column;max-width:480px;height:100dvh;margin:0 auto;display:flex;box-shadow:0 0 24px #0000001f}.topbar{padding:8px 12px;padding-top:calc(8px + env(safe-area-inset-top,0px));background:var(--panel);border-bottom:1px solid 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12px;font-size:14px}.btn-primary{background:var(--accent);color:#fff}.btn-primary:active:not(:disabled){background:var(--accent-dark)}.btn-outline{color:var(--accent-dark);border-color:var(--accent);background:#fff}.link-btn{min-height:var(--tap);min-width:var(--tap);color:var(--accent-dark);cursor:pointer;background:0 0;border:none;padding:0 4px;font-size:14px}.link-btn.danger{color:var(--danger);font-weight:600}.demo-tag{border:1px solid var(--demo);color:var(--demo);border-radius:4px;flex-shrink:0;padding:0 4px;font-size:11px;font-weight:600;line-height:16px}.messages{overscroll-behavior:contain;flex-direction:column;flex:1;gap:12px;padding:12px 10px;display:flex;overflow-y:auto}.center-note{color:var(--muted);align-self:center;align-items:center;gap:8px;margin:8px 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var(--accent);color:var(--accent-dark);cursor:pointer;white-space:nowrap;background:#fff;border-radius:20px;flex-shrink:0;padding:0 14px;font-size:14px}.composer{padding:8px 10px;padding-bottom:calc(8px + env(safe-area-inset-bottom,0px));background:var(--panel);border-top:1px solid var(--border);gap:8px;display:flex}.input-wrap{flex:1;min-width:0;position:relative}.composer input{width:100%;min-height:var(--tap);border:1px solid var(--border);background:#fff;border-radius:8px;padding:8px 10px;font-size:16px}.composer input[aria-invalid=true]{border-color:var(--danger)}.counter{color:var(--muted);font-size:10px;position:absolute;bottom:2px;right:8px}.counter.over{color:var(--danger)}.composer .send{min-width:64px}.form-error{background:var(--panel);color:var(--danger);margin:0;padding:0 12px 8px;font-size:13px}.agent-task{color:#193c2d;overflow-wrap:anywhere;background:#f5fff9;border:1px solid #a9d7c1;border-radius:16px;margin:12px 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