Border highlight

import type { CSSProperties } from "react";
import { BorderHighlight } from "./components/stepkit/BorderHighlight";
import "./components/stepkit/styles.css";

const themeStyle = {"--stepkit-bg":"#f7f7f8","--stepkit-surface":"#ffffff","--stepkit-surface-muted":"#f0f0f3","--stepkit-fg":"#17181c","--stepkit-muted":"#626572","--stepkit-border":"#e3e4e9","--stepkit-border-strong":"#c8cad3","--stepkit-code":"#f1f1f4","--stepkit-shadow":"0 20px 60px rgba(31, 26, 64, .10)","--stepkit-accent":"#6950df","--stepkit-accent-strong":"#5137c7","--stepkit-accent-soft":"#eeeafd","--stepkit-accent-on-soft":"#5137c7","--stepkit-accent-text":"#ffffff","--stepkit-error":"#b43145","--stepkit-placeholder":"#626572","--stepkit-radius":"16px","--stepkit-space":"16px","--stepkit-control-height":"44px","--stepkit-font-sans":"Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, \"Segoe UI\", sans-serif"} as CSSProperties;

export default function Example() {
  return (
    <div className="stepkit-theme" data-stepkit-preset="modern" style={themeStyle}>
      <BorderHighlight
      title={"Follow the signal"}
      intensity={"subtle"}
      paused={false}
      />
    </div>
  );
}

/*
 * Stepkit 0.2.0
 * Copyright (c) 2026 Vladislav Stepanov
 *
 * Original Stepkit portions in this release are licensed under the MIT License. Adapted portions identify their upstream licence and copyright in the copied source and in `NOTICE-MAGICUI.md` where applicable.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 *
 * # Magic UI MIT licence snapshot
 *
 * Source: https://github.com/magicuidesign/magicui/blob/main/LICENSE.md
 * Repository snapshot reviewed at commit: `bca54ab2730216c91e3a732f2af08e49c7ddebd4`
 * Retrieved through Firecrawl: 2026-09-19
 *
 * MIT License
 *
 * Copyright (c) Magic UI
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */
import type { AnchorHTMLAttributes, CSSProperties } from "react";
import "./styles.css";

/**
 * Adapted interaction reference: Magic UI Border Beam, MIT License.
 * Copyright (c) Magic UI. Source and licence evidence: provenance/.
 * Stepkit uses a local implementation with scoped tokens and no motion dependency.
 */
export type BorderHighlightIntensity = "subtle" | "strong";

export interface BorderHighlightProps extends Omit<AnchorHTMLAttributes<HTMLAnchorElement>, "title"> {
  title?: string;
  intensity?: BorderHighlightIntensity;
  paused?: boolean;
  size?: number;
  duration?: number;
  delay?: number;
  colorFrom?: string;
  colorTo?: string;
  reverse?: boolean;
  initialOffset?: number;
  borderWidth?: number;
}

type BorderHighlightStyle = CSSProperties & Record<`--stepkit-${string}`, string | number>;

function finiteNumber(value: number | undefined, fallback: number, min: number, max: number) {
  return Number.isFinite(value) ? Math.min(max, Math.max(min, value as number)) : fallback;
}

export function BorderHighlight({
  title = "Move through the interface",
  intensity = "subtle",
  paused = false,
  size = 52,
  duration = 6,
  delay = 0,
  colorFrom = "var(--stepkit-accent, #6950df)",
  colorTo = "var(--stepkit-accent-strong, #5137c7)",
  reverse = false,
  initialOffset = 0,
  borderWidth = 1,
  className = "",
  href = "#highlight",
  style,
  ...props
}: BorderHighlightProps) {
  const beamStyle: BorderHighlightStyle = {
    "--stepkit-beam-size": `${finiteNumber(size, 52, 12, 180)}px`,
    "--stepkit-beam-duration": `${finiteNumber(duration, 6, 1, 30)}`,
    "--stepkit-beam-delay": `${finiteNumber(delay, 0, 0, 30)}`,
    "--stepkit-beam-start": `${finiteNumber(initialOffset, 0, 0, 100)}%`,
    "--stepkit-beam-from": colorFrom,
    "--stepkit-beam-to": colorTo,
    "--stepkit-beam-width": `${finiteNumber(borderWidth, 1, 1, 4)}px`,
    ...style,
  };

  return (
    <a
      className={`stepkit stepkit-border-highlight${className ? ` ${className}` : ""}`}
      data-intensity={intensity}
      data-paused={paused}
      data-reverse={reverse}
      href={href}
      style={beamStyle}
      {...props}
    >
      <span className="stepkit-border-highlight__beam" aria-hidden="true" />
      <span className="stepkit-border-highlight__title">{title}</span>
      <span className="stepkit-border-highlight__hint">focus or hover to follow the beam</span>
    </a>
  );
}

export default BorderHighlight;