:root{--ink:#1b1f24;--muted:#5d6670;--line:#dfe3e8;--paper:#fff;--bg:#f4f5f7;--accent:#0b5cad;--accent-ink:#fff;--mine:#e8f0fa;--ins:#dff3e3;--ins-ink:#14532d;--del:#fbe4e4;--del-ink:#8a1c1c;--radius:10px;color:var(--ink);background:var(--bg);font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Noto Sans,Ubuntu,Cantarell,Helvetica Neue,sans-serif}*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit;color:inherit}button{cursor:pointer}:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.muted{color:var(--muted)}.error{color:var(--del-ink);min-height:1.2em}.login{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);display:grid;gap:14px;max-width:380px;margin:14vh auto 0;padding:32px}.login h1{margin:0;font-size:1.4rem}.login p{margin:0;line-height:1.45}.login input{border:1px solid var(--line);border-radius:8px;padding:11px 12px}.login button,.composer button{background:var(--accent);color:var(--accent-ink);border:0;border-radius:8px;padding:11px 16px;font-weight:600}.composer button:disabled{opacity:.5;cursor:default}.top{display:flex;background:var(--paper);border-bottom:1px solid var(--line);align-items: center;gap:14px;height:52px;padding:0 18px}.brand{font-weight:700}.who{color:var(--muted)}.top .link{color:var(--muted);text-decoration:underline;background:0 0;border:0;margin-left:auto}.tabs{display:none;gap:4px}.tab{border:1px solid var(--line);background:var(--paper);border-radius:999px;padding:5px 14px}.tab.on{background:var(--ink);color:var(--paper);border-color:var(--ink)}.workspace{display:grid;grid-template-columns:minmax(340px,2fr)3fr;height:calc(100dvh - 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