:root{color-scheme:light;--font-ui:"Aptos","Neue Haas Grotesk Text","Helvetica Neue","Segoe UI",sans-serif;--background:#f4f6f9;--background-accent:#eef3fb;--surface:rgba(255,255,255,0.9);--surface-strong:#ffffff;--surface-muted:#f7f9fc;--surface-inset:#eef2f7;--text:#152033;--muted:#5e6a7d;--line:rgba(26,47,86,0.12);--line-strong:rgba(26,47,86,0.2);--accent:#1d4e89;--accent-strong:#163e6e;--accent-soft:rgba(29,78,137,0.1);--success:#1f6a4e;--warning:#9b6a14;--danger:#a13a3a;--shadow:0 18px 48px rgba(18,33,60,0.08);--radius-xl:24px;--radius-lg:20px;--radius-md:16px;--radius-sm:12px}html[data-theme=dark]{color-scheme:dark;--background:#0f1624;--background-accent:#111d2f;--surface:rgba(18,27,43,0.92);--surface-strong:#142036;--surface-muted:#172338;--surface-inset:#0d1728;--text:#e7edf8;--muted:#a3afc4;--line:rgba(163,175,196,0.16);--line-strong:rgba(163,175,196,0.28);--accent:#7fb1ff;--accent-strong:#b3d0ff;--accent-soft:rgba(127,177,255,0.14);--success:#5ac69c;--warning:#efbc5b;--danger:#ef8f8f;--shadow:0 18px 48px rgba(0,0,0,0.34)}*{box-sizing:border-box}body,html{margin:0;min-height:100%}body{min-height:100vh;font-family:var(--font-ui);background:var(--background);color:var(--text)}a{color:inherit;text-decoration:none}button,input,textarea{font:inherit}.shell{width:min(1380px,calc(100vw - 40px));margin:0 auto;padding:28px 0 52px}.chat-app-shell{--sidebar-width:280px;display:grid;grid-template-columns:var(--sidebar-width) minmax(0,1fr);height:100vh;overflow:hidden;background:var(--background-accent);transition:grid-template-columns .18s ease}.chat-app-shell.is-sidebar-collapsed{--sidebar-width:94px}.chat-sidebar{position:-webkit-sticky;position:sticky;top:0;display:flex;flex-direction:column;height:100vh;overflow:hidden;border-right:1px solid var(--line);background:var(--surface-strong);transition:width .18s ease,transform .2s ease}.chat-sidebar-top{padding:18px 16px 12px;border-bottom:1px solid var(--line)}.sidebar-header-row{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.business-select-block{margin-bottom:14px}.business-select{width:100%;padding:10px 12px;border:1px solid var(--line-strong);border-radius:12px;background:var(--surface-strong);color:var(--text)}.brand-lockup{display:flex;align-items:center;gap:10px;margin-bottom:18px}.brand-mark{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:12px;background:color-mix(in srgb,var(--accent-soft) 78%,white 22%);overflow:hidden}.brand-mark-image{width:22px;height:22px;object-fit:contain}.brand-copy{display:flex;min-width:0;flex-direction:column;gap:4px}.brand-name{font-size:1.3rem;font-weight:700;color:var(--accent)}.brand-tagline{color:var(--muted);font-size:.92rem;font-style:italic}.new-chat-button{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;padding:13px 16px;border:0;border-radius:12px;background:var(--accent);color:white;cursor:pointer;font-weight:600;margin-bottom:1.5rem}.sidebar-button-label{min-width:0}.sidebar-collapse-button{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border:1px solid var(--line);border-radius:12px;background:transparent;color:var(--muted);cursor:pointer;transition:background-color .14s ease,color .14s ease,border-color .14s 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p{margin:0;color:var(--muted)}.admin-page-header{background:var(--surface-strong)}.admin-page-header-top{margin-bottom:10px}.admin-back-link{display:inline-flex;align-items:center;gap:8px;color:var(--muted);text-decoration:none;font-size:.92rem;font-weight:600}.admin-back-link svg{width:14px;height:14px}.admin-back-link:hover{color:var(--text)}.admin-page-header h1{font-size:1.2rem}.admin-page-body{min-height:0;overflow:auto;padding:28px}.admin-detail-layout{width:min(1120px,100%);margin:0 auto}.admin-detail-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-gap:16px;gap:16px;align-items:start}.admin-two-panel{display:grid;grid-template-columns:minmax(340px,.92fr) minmax(420px,1.3fr);grid-gap:20px;gap:20px;align-items:start}.admin-form-panel,.admin-list-panel{padding:22px;border:1px solid var(--line);border-radius:20px;background:color-mix(in srgb,var(--surface-strong) 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