:root{--bg:var(--sb-color-surface);--panel:var(--sb-color-bg);--border:var(--sb-color-border);--text:var(--sb-color-fg);--muted:var(--sb-color-fg-muted);--primary:var(--sb-color-primary);--primary-text:var(--sb-color-primary-text);--inbound:#dbeafe;--outbound:#f1f5f9;--note:#fef3c7;--error:#fee2e2;--error-text:#991b1b;--scrollbar-thumb:rgba(15,23,42,0.18);--scrollbar-thumb-hover:rgba(15,23,42,0.32);--draft-bg:color-mix(in srgb,var(--primary) 15%,transparent);--surface:var(--panel);--fg:var(--text);--fg-muted:var(--muted);--brand-primary:var(--primary);--brand-primary-hover:color-mix(in srgb,var(--primary) 85%,var(--text));--accent:var(--primary);--accent-strong:color-mix(in srgb,var(--primary) 80%,var(--text));--border-strong:color-mix(in srgb,var(--border) 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