:root{--theme-bg:#fff;--theme-fg:#000;--theme-muted:#6b7280;--theme-border:#e5e7eb;--theme-panel:#fafafa}.theme-surface{background:var(--theme-bg);color:var(--theme-fg)}.theme-card{background:var(--theme-panel);border:1px solid var(--theme-border);border-radius:12px}.theme-muted{color:var(--theme-muted)}