:root{--paper:#f5f3f2;--card:rgba(255,255,255,0.94);--ink:#141313;--soft:#555050;--muted:#888181;--line:#e7e2e0;--brand:#c60000;--brand-deep:#8f1010;--danger:#a61b1b}*{box-sizing:border-box}body,html{min-height:100%}body{margin:0;overflow:hidden;background:radial-gradient(circle at 82% 112%,rgba(198,0,0,.19),transparent 31%),radial-gradient(circle at 4% -12%,rgba(135,111,104,.09),transparent 28%),linear-gradient(145deg,#fbfaf9,#f4f1f0 58%,#efebea);color:var(--ink);font-family:system-ui,-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,sans-serif}button,input,textarea{font:inherit}button{border:0;cursor:pointer}button:disabled{cursor:not-allowed;opacity:.48}a{color:inherit;text-decoration:none}::selection{background:var(--brand);color:white}:focus-visible{outline:2px solid var(--brand);outline-offset:2px}.chat-shell{display:flex;width:100%;min-height:100dvh;padding:14px;gap:10px}.chat-main,.chat-sidebar{height:calc(100dvh - 28px);overflow:hidden;border:1px solid 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