:root{--ar-blue:#2a72b3;--navy-900:#10293f;--navy-850:#142f47;--navy-800:#1a3a57;--navy-700:#224a6e;--navy-line:#26496b;--ink:#1c2a37;--body:#26333f;--muted:#3d4b59;--muted-light:#5d6b78;--link:#1a5fa8;--indigo:var(--ar-blue);--accent:#2a72b3;--user-bubble:#eef3f8;--chip:#eef3f8;--border:#cdd7e0;--border-soft:#e2e8ee;--page:#ffffff;--sidebar-w:240px;--rail-w:310px;--font:"Public Sans","Inter","Segoe UI",-apple-system,BlinkMacSystemFont,"Helvetica Neue",Arial,sans-serif}*{box-sizing:border-box}body,html{margin:0;padding:0;height:100%}body{font-family:var(--font);background:var(--page);color:var(--body);-webkit-font-smoothing:antialiased;font-size:15px;line-height:1.55}button{font:inherit;color:inherit;background:none;border:none;cursor:pointer}a{color:var(--link);text-decoration:none}a:hover{text-decoration:underline}.app{display:grid;grid-template-columns:var(--sidebar-w) 1fr;grid-template-rows:64px 1fr;height:100vh;overflow:hidden}.topbar{grid-column:1/-1;background:var(--navy-900);justify-content:space-between;padding:0 24px 0 18px;color:#fff}.brand,.topbar{display:flex;align-items:center}.brand{gap:12px}.brand-mark{display:grid;place-items:center;border-radius:6px;background:#fff;flex:none;padding:3px 6px}.brand-mark img{display:block;height:38px;width:auto;max-width:100%}.brand-divider{width:1px;height:26px;background:rgba(255,255,255,.25);flex:none}.brand-name{font-size:19px;font-weight:700;line-height:1.1;letter-spacing:-.2px}.brand-sub{font-size:12.5px;color:#a9c0d6;margin-top:1px}.topbar-right{gap:26px}.topbar-right,.user-chip{display:flex;align-items:center}.user-chip{gap:10px;color:#eaf0fa;font-size:14.5px}.user-avatar{width:34px;height:34px;border-radius:50%;background:var(--ar-blue);display:grid;place-items:center;font-size:14px;font-weight:600;color:#fff}.sidebar{background:var(--navy-850);border-right:1px solid rgba(255,255,255,.08);display:flex;flex-direction:column;padding:16px 12px 20px;overflow-y:auto}.new-chat{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;padding:11px 16px;border-radius:8px;background:var(--ar-blue);color:#fff;font-size:14.5px;font-weight:700;margin-bottom:18px}.new-chat:hover{background:#225e94}.new-chat:focus-visible{outline:2px solid #fff;outline-offset:1px}.nav{display:flex;flex-direction:column;gap:2px}.nav-section-label{margin:20px 12px 6px;font-size:11px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:#8fadc7}.nav-item{display:flex;align-items:center;gap:12px;width:100%;padding:10px 12px;border-radius:8px;color:#d5e2ee;font-size:14.5px;text-align:left}.nav-item:hover{background:rgba(255,255,255,.07);color:#fff;text-decoration:none}.nav-item[aria-current=page]{background:rgba(255,255,255,.13);color:#fff;font-weight:600}.nav-item svg{color:#9fbcd6;flex:none}.nav-item[aria-current=page] 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