/**
 * State-based style layers:
 *   .container                   → Base layout (always applied)
 *   .container.expanded          → Expanded token set on host
 *   .container.collapsed         → Collapsed token set on host
 *   .container.standard          → Standard-mode styles
 *   .container.modal             → Modal-mode styles
 *   .container.expanded.standard → Expanded standard overrides
 *   .container.expanded.modal    → Expanded modal overrides
 *   .container.collapsed         → Collapsed layout overrides
 *
 * Width transitions between collapsed ↔ expanded are handled by
 * CSS `transition` on `.container`. Modal enter/exit animations
 * use WAAPI via `NavigationRail.animateHost()`.
 */
export declare const NavigationRailStyles: import("lit").CSSResult[];
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