/**
 * background-card-element.ts - <background-card> Custom Element
 *
 * Interactive background selection card. Framework-agnostic.
 *
 * Attributes: type, label, gradient, accent-color, selected, disabled,
 *             tilt-degrees, glow-size
 *
 * Events: background-select ({ type: string })
 *
 * Slot: default — icon content (light DOM, inherits consumer CSS).
 *       Falls back to SVG from the registry when no slot content provided.
 *
 * Shadow DOM with open mode. Parts exposed for ::part() styling.
 */
/**
 * `HTMLElement` does not exist during SSR, and `class X extends undefined`
 * throws at module evaluation — importing this file server-side was enough to
 * crash the render, before any custom element was ever constructed. Extending a
 * stub off-DOM keeps the module importable; registration is guarded separately
 * and only ever happens in a browser.
 *
 * Consumers previously carried this as a patch against dist. Fixed at source in
 * 0.7.1 so the patch can be dropped.
 */
declare const HTMLElementBase: typeof HTMLElement;
export declare class BackgroundCardElement extends HTMLElementBase {
    static get observedAttributes(): readonly string[];
    private _shadow;
    private _fillEl;
    private _glowEl;
    private _iconEl;
    private _fallbackIcon;
    private _nameEl;
    private _ringEl;
    private _tiltHandle;
    private _glowHandle;
    private _spring;
    constructor();
    connectedCallback(): void;
    disconnectedCallback(): void;
    attributeChangedCallback(name: string, oldValue: string | null, newValue: string | null): void;
    private _buildDOM;
    private _applyAttributes;
    /**
     * When `type` is set, pull defaults from the registry for any
     * attribute the consumer hasn't explicitly overridden.
     */
    private _applyTypeDefaults;
    private _updateGradient;
    private _updateAccent;
    private _updateLabel;
    private _updateFallbackIcon;
    private _syncAriaChecked;
    private _syncDisabled;
    private _getMeta;
    private _attachEffects;
    private _attachInteraction;
    private _handleActivation;
    private _handleKeydown;
}
/**
 * Register the <background-card> custom element.
 * Safe to call multiple times — only registers once.
 * Call this in your app's entry point or top-level component.
 */
export declare function registerBackgroundCard(): void;
export {};
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