# Footer Section

> Site footer with a brand column of logo, tagline and social icons that lift on hover, link columns that collapse into disclosures in narrow containers, a newsletter signup that validates email and runs idle, loading, success and error states from an onSubscribe promise, and a bottom bar with legal links and a theme toggle slot.

A shadcn/ui block from the [@karaui](https://karaui.kamisama-v0.my.id/?utm_source=shadcn.exchange) registry, listed on [shadcn.exchange](https://shadcn.exchange/r/karaui/footer-section).

- Page, with a live preview: https://shadcn.exchange/r/karaui/footer-section
- Screenshot: https://abzjhwgwpdpz7ua5.public.blob.vercel-storage.com/shots/karaui/footer-section-light-3a69f6af52d16cf7.png
- Registry item: https://karaui.kamisama-v0.my.id/r/footer-section.json
- Listed: 2026-10-20, source last changed 2026-10-20

## Install

```bash
npx shadcn@latest add https://shadcn.exchange/r/karaui/footer-section.json
```

Run it in a project that has shadcn/ui set up. It adds the files below and installs what they depend on.

## Dependencies

- npm packages: `clsx`, `lucide-react`, `motion`, `tailwind-merge`

## Files

### `components/motion/footer-section.tsx`

```tsx
"use client";
// karaui.kamisama-v0.my.id/components/blocks/footer-section

import { ChevronDown, Send } from "lucide-react";
import { motion, useReducedMotion } from "motion/react";
import { type FormEvent, type ReactNode, useEffect, useId, useRef, useState } from "react";
import { type ButtonState, StatefulButton } from "@/components/motion/button";
import { EASE_OUT_CSS, SPRING_PRESS } from "@/lib/ease";
import { useHoverCapable } from "@/lib/hooks/use-hover-capable";
import { cn } from "@/lib/utils";

export interface FooterLink {
  label: ReactNode;
  href: string;
}

export interface FooterLinkColumn {
  title: string;
  links: FooterLink[];
}

export interface FooterSocialLink {
  /** Accessible name, e.g. "GitHub". */
  label: string;
  href: string;
  icon: ReactNode;
}

export interface FooterNewsletter {
  title?: ReactNode;
  description?: ReactNode;
  placeholder?: string;
  buttonLabel?: ReactNode;
  successMessage?: ReactNode;
}

export interface FooterSectionProps {
  logo?: ReactNode;
  tagline?: ReactNode;
  socials?: FooterSocialLink[];
  columns?: FooterLinkColumn[];
  /** Newsletter copy. Shown when `onSubscribe` is set. */
  newsletter?: FooterNewsletter;
  /** Resolve to confirm the signup; reject (or throw) to show the error state. */
  onSubscribe?: (email: string) => Promise<void> | void;
  /** Owner after the © sign, e.g. "Acme Inc." */
  copyright?: ReactNode;
  /** Pass the year in; it is never computed during render. */
  year?: number;
  legalLinks?: FooterLink[];
  /** Slot at the end of the bottom bar, e.g. a theme toggle. */
  themeToggle?: ReactNode;
  className?: string;
}

const EMAIL_PATTERN = /^[^\s@]+@[^\s@]+\.[^\s@]{2,}$/;

export function isValidEmail(value: string) {
  return EMAIL_PATTERN.test(value.trim());
}

function SocialLink({ social }: { social: FooterSocialLink }) {
  const reduce = useReducedMotion();
  const canHover = useHoverCapable();
  const lift = !reduce && canHover;
  return (
    <motion.a
      href={social.href}
      aria-label={social.label}
      target="_blank"
      rel="noreferrer noopener"
      whileHover={lift ? { y: -3 } : undefined}
      whileTap={reduce ? undefined : { scale: 0.92 }}
      transition={SPRING_PRESS}
      className="grid size-9 place-items-center rounded-full border border-border bg-card text-muted-foreground outline-none transition-colors hover:border-border-strong hover:text-foreground focus-visible:ring-2 focus-visible:ring-ring/50 [&_svg]:size-4"
    >
      {social.icon}
    </motion.a>
  );
}

function LinkColumn({ column }: { column: FooterLinkColumn }) {
  const [open, setOpen] = useState(false);
  const id = useId();
  const listId = `${id}-links`;

  return (
    <div className="border-b border-border @md:border-b-0">
      {/* Narrow containers: the title is a disclosure button. */}
      <button
        type="button"
        aria-expanded={open}
        aria-controls={listId}
        onClick={() => setOpen((v) => !v)}
        className="flex h-11 w-full items-center justify-between text-left text-sm font-medium text-foreground outline-none focus-visible:ring-2 focus-visible:ring-ring/50 @md:hidden"
      >
        {column.title}
        <ChevronDown
          aria-hidden
          className={cn(
            "size-4 text-muted-foreground transition-transform duration-200 motion-reduce:transition-none",
            open && "rotate-180",
          )}
        />
      </button>
      {/* Wide containers: a plain heading, list always shown. */}
      <h3 className="hidden text-sm font-medium text-foreground @md:block">
        {column.title}
      </h3>
      {/* Grid-row 0fr→1fr is a layout animation on purpose: the collapsed
          column has to push the following ones down. `invisible` keeps
          closed links out of tab order and the a11y tree on narrow widths. */}
      <div
        id={listId}
        style={{ transitionTimingFunction: EASE_OUT_CSS }}
        className={cn(
          "grid transition-[grid-template-rows,visibility] duration-300 motion-reduce:transition-none @md:visible @md:grid-rows-[1fr]",
          open ? "visible grid-rows-[1fr]" : "invisible grid-rows-[0fr]",
        )}
      >
        <ul className="flex flex-col gap-2.5 overflow-hidden pb-4 @md:mt-4 @md:pb-0">
          {column.links.map((link) => (
            <li key={link.href}>
              <a
                href={link.href}
                className="rounded-sm text-sm text-muted-foreground outline-none transition-colors hover:text-foreground focus-visible:ring-2 focus-visible:ring-ring/50"
              >
                {link.label}
              </a>
            </li>
          ))}
        </ul>
      </div>
    </div>
  );
}

function NewsletterForm({
  newsletter,
  onSubscribe,
}: {
  newsletter: FooterNewsletter;
  onSubscribe: (email: string) => Promise<void> | void;
}) {
  const id = useId();
  const [email, setEmail] = useState("");
  const [state, setState] = useState<ButtonState>("idle");
  const [error, setError] = useState<string | null>(null);
  const timer = useRef<number | undefined>(undefined);

  useEffect(
    () => () => {
      if (timer.current) window.clearTimeout(timer.current);
    },
    [],
  );

  const submit = async (event: FormEvent<HTMLFormElement>) => {
    event.preventDefault();
    if (state === "loading" || state === "success") return;
    if (!isValidEmail(email)) {
      setError("Enter a valid email address.");
      return;
    }
    setError(null);
    setState("loading");
    try {
      await onSubscribe(email.trim());
      setState("success");
    } catch {
      setState("error");
      setError("Something went wrong. Try again.");
      timer.current = window.setTimeout(() => setState("idle"), 2400);
    }
  };

  const done = state === "success";

  return (
    <div className="flex flex-col gap-3">
      <h3 className="text-sm font-medium text-foreground">
        {newsletter.title ?? "Stay in the loop"}
      </h3>
      {newsletter.description ? (
        <p className="text-sm leading-6 text-muted-foreground">
          {newsletter.description}
        </p>
      ) : null}
      <form noValidate onSubmit={submit} className="flex flex-col gap-2">
        <div className="flex items-center gap-2">
          <label htmlFor={`${id}-email`} className="sr-only">
            Email address
          </label>
          <input
            id={`${id}-email`}
            type="email"
            inputMode="email"
            autoComplete="email"
            value={email}
            disabled={done}
            aria-invalid={error ? true : undefined}
            aria-describedby={`${id}-status`}
            onChange={(event) => {
              setEmail(event.target.value);
              if (error && isValidEmail(event.target.value)) setError(null);
            }}
            placeholder={newsletter.placeholder ?? "you@example.com"}
            className={cn(
              "h-10 min-w-0 flex-1 rounded-full border bg-card px-4 text-sm text-foreground outline-none transition-colors placeholder:text-muted-foreground focus-visible:ring-2 disabled:opacity-60",
              error
                ? "border-destructive focus-visible:ring-destructive/30"
                : "border-border focus-visible:border-border-strong focus-visible:ring-ring/40",
            )}
          />
          <StatefulButton
            type="submit"
            state={state}
            loadingText="Joining"
            successText="Subscribed"
            errorText="Retry"
            icon={<Send aria-hidden className="size-3.5" />}
            className="shrink-0"
          >
            {newsletter.buttonLabel ?? "Subscribe"}
          </StatefulButton>
        </div>
        <p
          id={`${id}-status`}
          aria-live="polite"
          className={cn(
            "min-h-5 text-xs",
            error ? "text-destructive" : "text-muted-foreground",
          )}
        >
          {error ??
            (done
              ? (newsletter.successMessage ?? "Thanks! Check your inbox to confirm.")
              : "")}
        </p>
      </form>
    </div>
  );
}

/**
 * Site footer: brand column (logo, tagline, social icons that lift on hover),
 * link columns that collapse into disclosures in narrow containers, a
 * newsletter signup with idle/loading/success/error states driven by the
 * `onSubscribe` promise, and a bottom bar with copyright, legal links and an
 * optional theme toggle slot. Layout follows the footer's own container.
 */
export function FooterSection({
  logo,
  tagline,
  socials = [],
  columns = [],
  newsletter = {},
  onSubscribe,
  copyright,
  year,
  legalLinks = [],
  themeToggle,
  className,
}: FooterSectionProps) {
  const hasNewsletter = Boolean(onSubscribe);

  return (
    <footer
      className={cn(
        "@container w-full border-t border-border text-foreground",
        className,
      )}
    >
      <div
        className={cn(
          "grid gap-8 py-10 @xl:grid-cols-2 @xl:gap-x-10",
          hasNewsletter
            ? "@4xl:grid-cols-[minmax(0,1fr)_minmax(0,2fr)_minmax(0,1.2fr)]"
            : "@4xl:grid-cols-[minmax(0,1fr)_minmax(0,2fr)]",
        )}
      >
        <div className="order-1 flex flex-col gap-4">
          {logo ? <div className="flex items-center">{logo}</div> : null}
          {tagline ? (
            <p className="max-w-xs text-pretty text-sm leading-6 text-muted-foreground">
              {tagline}
            </p>
          ) : null}
          {socials.length ? (
            <ul className="flex flex-wrap items-center gap-2">
              {socials.map((social) => (
                <li key={social.href}>
                  <SocialLink social={social} />
                </li>
              ))}
            </ul>
          ) : null}
        </div>

        {columns.length ? (
          <nav
            aria-label="Footer"
            className={cn(
              "order-2 grid @md:grid-cols-3 @md:gap-6",
              hasNewsletter && "@xl:order-3 @xl:col-span-2 @4xl:order-2 @4xl:col-span-1",
            )}
          >
            {columns.map((column) => (
              <LinkColumn key={column.title} column={column} />
            ))}
          </nav>
        ) : null}

        {onSubscribe ? (
          <div className="order-3 @xl:order-2 @4xl:order-3">
            <NewsletterForm newsletter={newsletter} onSubscribe={onSubscribe} />
          </div>
        ) : null}
      </div>

      <div className="flex flex-col gap-3 border-t border-border py-5 text-xs text-muted-foreground @md:flex-row @md:items-center @md:justify-between">
        <p>
          &copy; {year !== undefined ? `${year} ` : ""}
          {copyright}
        </p>
        <div className="flex flex-wrap items-center gap-x-4 gap-y-2">
          {legalLinks.map((link) => (
            <a
              key={link.href}
              href={link.href}
              className="rounded-sm outline-none transition-colors hover:text-foreground focus-visible:ring-2 focus-visible:ring-ring/50"
            >
              {link.label}
            </a>
          ))}
          {themeToggle ? <div className="flex items-center">{themeToggle}</div> : null}
        </div>
      </div>
    </footer>
  );
}
```

### `components/motion/button/index.tsx`

```tsx
export type {
  ButtonLinkProps,
  ButtonProps,
  ButtonSize,
  ButtonVariant,
} from "./base";
export { Button, ButtonLink } from "./base";
export type { MagneticButtonProps } from "./magnetic";
export { MagneticButton } from "./magnetic";
export type { ButtonState, StatefulButtonProps } from "./stateful";
export { StatefulButton } from "./stateful";
```

### `lib/ease.ts`

```ts
// Shared motion tokens. Easing curves mirror the CSS custom properties in
// globals.css; springs are the canonical physics used across components.
// Strong custom variants — defaults like `ease-in`/`ease-out` feel weak.

export const EASE_OUT = [0.16, 1, 0.3, 1] as const;
export const EASE_IN_OUT = [0.77, 0, 0.175, 1] as const;
export const EASE_DRAWER = [0.32, 0.72, 0, 1] as const;

/** CSS string form of EASE_OUT for inline style transitions. */
export const EASE_OUT_CSS = "cubic-bezier(0.16, 1, 0.3, 1)";

/** Press feedback on buttons and other tappable surfaces. */
export const SPRING_PRESS = {
  type: "spring",
  stiffness: 500,
  damping: 30,
  mass: 0.6,
} as const;

/** Content swaps — label/icon slots trading places inside a control. */
export const SPRING_SWAP = {
  type: "spring",
  stiffness: 460,
  damping: 30,
  mass: 0.55,
} as const;

/** Overlay panel entrances — modals and sheets summoned by pointer. */
export const SPRING_PANEL = {
  type: "spring",
  stiffness: 420,
  damping: 40,
  mass: 0.5,
} as const;

/** Shared-layout glides — pills, indicators and panels morphing between positions. */
export const SPRING_LAYOUT = {
  type: "spring",
  stiffness: 360,
  damping: 32,
  mass: 0.6,
} as const;

/** Cursor-follow physics for decorative mouse tracking (magnetic, tilt, dock). */
export const SPRING_MOUSE = {
  stiffness: 200,
  damping: 15,
  mass: 0.3,
} as const;

/** Dragged handles and fills (sliders) — critically damped `useSpring` config,
 * so the value follows the pointer butterily and never rebounds off an end. */
export const SPRING_GLIDE = {
  stiffness: 700,
  damping: 50,
  mass: 0.5,
} as const;
```

### `lib/hooks/use-hover-capable.ts`

```ts
"use client";

import { useEffect, useState } from "react";

/**
 * Returns true only on devices that have a true hover (mouse / trackpad).
 * Touch devices fire phantom `:hover` on tap that sticks until tap-elsewhere
 * — gate hover-only effects (scale lifts, magnetic pulls) behind this.
 */
export function useHoverCapable() {
  const [canHover, setCanHover] = useState(false);

  useEffect(() => {
    if (typeof window === "undefined" || !window.matchMedia) return;
    const mq = window.matchMedia("(hover: hover) and (pointer: fine)");
    const update = () => setCanHover(mq.matches);
    update();
    mq.addEventListener?.("change", update);
    return () => mq.removeEventListener?.("change", update);
  }, []);

  return canHover;
}
```

### `lib/utils.ts`

```ts
import { clsx, type ClassValue } from "clsx"
import { twMerge } from "tailwind-merge"

export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs))
}
```

### `components/motion/button/base.tsx`

```tsx
"use client";

import {
  AnimatePresence,
  type HTMLMotionProps,
  motion,
  useReducedMotion,
} from "motion/react";
import {
  forwardRef,
  type PointerEvent,
  type ReactNode,
  useCallback,
  useRef,
  useState,
} from "react";
import { EASE_OUT, SPRING_PRESS } from "@/lib/ease";
import { useHoverCapable } from "@/lib/hooks/use-hover-capable";
import { cn } from "@/lib/utils";

export type ButtonVariant = "primary" | "secondary" | "ghost" | "outline";
export type ButtonSize = "sm" | "md" | "lg" | "icon";

export interface ButtonProps extends Omit<
  HTMLMotionProps<"button">,
  "children"
> {
  variant?: ButtonVariant;
  size?: ButtonSize;
  pressScale?: number;
  /** Spawn a Material-style ripple from the press point. Off by default. */
  ripple?: boolean;
  children?: ReactNode;
}

export interface ButtonLinkProps extends Omit<
  HTMLMotionProps<"a">,
  "children"
> {
  variant?: ButtonVariant;
  size?: ButtonSize;
  pressScale?: number;
  children?: ReactNode;
}

type Ripple = { id: number; x: number; y: number; size: number };

const VARIANT_CLASS: Record<ButtonVariant, string> = {
  primary: "bg-primary text-primary-foreground hover:bg-primary/90",
  secondary: "border border-border bg-card text-foreground hover:border-border",
  ghost: "text-muted-foreground hover:text-foreground hover:bg-primary/5",
  outline:
    "border border-border bg-transparent text-foreground hover:bg-primary/5",
};

const SIZE_CLASS: Record<ButtonSize, string> = {
  sm: "h-8 px-3 text-xs gap-1.5 rounded-full",
  md: "h-10 px-5 text-sm gap-2 rounded-full",
  lg: "h-12 px-6 text-base gap-2 rounded-full",
  icon: "h-8 w-8 rounded-lg",
};

export const Button = forwardRef<HTMLButtonElement, ButtonProps>(
  function Button(
    {
      variant = "primary",
      size = "md",
      pressScale = 0.93,
      ripple = false,
      className,
      children,
      onPointerDown,
      ...rest
    },
    ref,
  ) {
    const reduce = useReducedMotion();
    const canHover = useHoverCapable();
    const [ripples, setRipples] = useState<Ripple[]>([]);
    const nextId = useRef(0);

    const handlePointerDown = useCallback(
      (event: PointerEvent<HTMLButtonElement>) => {
        if (ripple && !reduce) {
          const rect = event.currentTarget.getBoundingClientRect();
          const size = Math.max(rect.width, rect.height) * 2;
          const id = nextId.current++;
          setRipples((prev) => [
            ...prev,
            {
              id,
              x: event.clientX - rect.left,
              y: event.clientY - rect.top,
              size,
            },
          ]);
        }
        onPointerDown?.(event);
      },
      [ripple, reduce, onPointerDown],
    );

    return (
      <motion.button
        ref={ref}
        type="button"
        whileTap={reduce ? undefined : { scale: pressScale }}
        whileHover={reduce || !canHover ? undefined : { scale: 1.02 }}
        transition={SPRING_PRESS}
        onPointerDown={handlePointerDown}
        className={cn(
          "inline-flex items-center justify-center font-medium select-none",
          "transition-colors",
          "disabled:pointer-events-none disabled:opacity-50",
          ripple && "relative overflow-hidden",
          VARIANT_CLASS[variant],
          SIZE_CLASS[size],
          className,
        )}
        {...rest}
      >
        {ripple && !reduce ? (
          <span className="pointer-events-none absolute inset-0 overflow-hidden rounded-[inherit]">
            <AnimatePresence>
              {ripples.map((r) => (
                <motion.span
                  key={r.id}
                  className="absolute rounded-full bg-current"
                  style={{
                    left: r.x,
                    top: r.y,
                    width: r.size,
                    height: r.size,
                    x: "-50%",
                    y: "-50%",
                  }}
                  initial={{ scale: 0.05, opacity: 0.3 }}
                  animate={{ scale: 1, opacity: 0 }}
                  exit={{ opacity: 0 }}
                  transition={{ duration: 1.6, ease: EASE_OUT }}
                  onAnimationComplete={() =>
                    setRipples((prev) => prev.filter((x) => x.id !== r.id))
                  }
                />
              ))}
            </AnimatePresence>
          </span>
        ) : null}
        {children}
      </motion.button>
    );
  },
);

export const ButtonLink = forwardRef<HTMLAnchorElement, ButtonLinkProps>(
  function ButtonLink(
    {
      variant = "primary",
      size = "md",
      pressScale = 0.93,
      className,
      children,
      ...rest
    },
    ref,
  ) {
    const reduce = useReducedMotion();
    const canHover = useHoverCapable();

    return (
      <motion.a
        ref={ref}
        whileTap={reduce ? undefined : { scale: pressScale }}
        whileHover={reduce || !canHover ? undefined : { scale: 1.02 }}
        transition={SPRING_PRESS}
        className={cn(
          "inline-flex items-center justify-center font-medium select-none",
          "transition-colors",
          VARIANT_CLASS[variant],
          SIZE_CLASS[size],
          className,
        )}
        {...rest}
      >
        {children}
      </motion.a>
    );
  },
);
```

### `components/motion/button/magnetic.tsx`

```tsx
"use client";

import { forwardRef } from "react";
import { Magnetic } from "../magnetic";
import { Button, type ButtonProps } from "./base";

export interface MagneticButtonProps extends ButtonProps {
  /** Magnetic pull strength. Default 0.25. */
  strength?: number;
  /** Class applied to the magnetic wrapper. */
  magneticClassName?: string;
}

export const MagneticButton = forwardRef<HTMLButtonElement, MagneticButtonProps>(function MagneticButton(
  { strength = 0.25, magneticClassName, children, ...rest },
  ref,
) {
  return (
    <Magnetic strength={strength} className={magneticClassName}>
      <Button ref={ref} {...rest}>
        {children}
      </Button>
    </Magnetic>
  );
});
```

### `components/motion/button/stateful.tsx`

```tsx
"use client";

import { Check, Loader2, X } from "lucide-react";
import {
  AnimatePresence,
  motion,
  useReducedMotion,
  type Variants,
} from "motion/react";
import {
  forwardRef,
  type ReactNode,
  useLayoutEffect,
  useRef,
  useState,
} from "react";
import { EASE_OUT, SPRING_SWAP } from "@/lib/ease";
import { Button, type ButtonProps } from "./base";

export type ButtonState = "idle" | "loading" | "success" | "error";

export interface StatefulButtonProps extends Omit<ButtonProps, "children"> {
  state?: ButtonState;
  children: ReactNode;
  loadingText?: ReactNode;
  successText?: ReactNode;
  errorText?: ReactNode;
  icon?: ReactNode;
}

const CASCADE_STAGGER = 0.025;
const ROLL_BLUR = "blur(6px)";

const CASCADE_LETTER_VARIANTS: Variants = {
  initial: { opacity: 0, y: "105%", filter: ROLL_BLUR },
  animate: (delay: number = 0) => ({
    opacity: 1,
    y: "0%",
    filter: "blur(0px)",
    transition: { ...SPRING_SWAP, delay },
  }),
  exit: (delay: number = 0) => ({
    opacity: 0,
    y: "-105%",
    filter: ROLL_BLUR,
    transition: { duration: 0.16, ease: EASE_OUT, delay: delay * 0.5 },
  }),
};

const ICON_VARIANTS: Variants = {
  // Width collapses too, so the icon adds/removes its own space smoothly
  // instead of popping the row width in a single frame.
  initial: { opacity: 0, width: 0, scale: 0.7, filter: ROLL_BLUR },
  animate: {
    opacity: 1,
    width: "1.5rem",
    scale: 1,
    filter: "blur(0px)",
    transition: SPRING_SWAP,
  },
  exit: {
    opacity: 0,
    width: 0,
    scale: 0.7,
    filter: ROLL_BLUR,
    transition: { duration: 0.16, ease: EASE_OUT },
  },
};

function IconSlot({ keyId, children }: { keyId: string; children: ReactNode }) {
  const reduce = useReducedMotion();
  return (
    <motion.span
      key={keyId}
      variants={ICON_VARIANTS}
      initial={reduce ? { opacity: 0 } : "initial"}
      animate={reduce ? { opacity: 1 } : "animate"}
      exit={reduce ? { opacity: 0 } : "exit"}
      transition={reduce ? { duration: 0.15 } : undefined}
      className="inline-grid shrink-0 place-items-center overflow-hidden"
    >
      {children}
    </motion.span>
  );
}

function TextSlot({
  value,
  children,
}: {
  value: string;
  children: ReactNode;
}) {
  const reduce = useReducedMotion();
  const measureRef = useRef<HTMLSpanElement>(null);
  const [width, setWidth] = useState<number>();
  const label = typeof children === "string" ? children : null;
  const cascade = label !== null && !reduce;

  // Measure strings with the same per-letter layout as the cascade. Measuring
  // the whole string preserves kerning, which can make it narrower than the
  // inline-block letters and clip the final glyph during the width animation.
  useLayoutEffect(() => {
    const nextWidth = measureRef.current?.offsetWidth;
    if (!nextWidth) return;
    setWidth((current) => (current === nextWidth ? current : nextWidth));
  });

  return (
    <motion.span
      initial={false}
      animate={{ width }}
      transition={reduce ? { duration: 0 } : SPRING_SWAP}
      className="relative inline-block overflow-hidden whitespace-nowrap align-bottom"
    >
      <span
        ref={measureRef}
        aria-hidden
        className="invisible inline-block whitespace-nowrap"
      >
        {cascade
          ? label.split("").map((char, index) => (
              <span
                // biome-ignore lint/suspicious/noArrayIndexKey: position is the slot identity.
                key={index}
                className="inline-block whitespace-pre"
              >
                {char}
              </span>
            ))
          : children}
      </span>

      {cascade ? (
        <>
          <span className="sr-only">{label}</span>
          <AnimatePresence initial={false}>
            <motion.span
              key={`cascade-${value}`}
              aria-hidden
              initial="initial"
              animate="animate"
              exit="exit"
              className="absolute left-0 top-0 inline-block whitespace-pre"
            >
              {label.split("").map((char, index) => (
                <motion.span
                  // biome-ignore lint/suspicious/noArrayIndexKey: position is the slot identity.
                  key={index}
                  custom={index * CASCADE_STAGGER}
                  variants={CASCADE_LETTER_VARIANTS}
                  className="inline-block whitespace-pre will-change-[opacity,filter,transform]"
                >
                  {char}
                </motion.span>
              ))}
            </motion.span>
          </AnimatePresence>
        </>
      ) : (
        <AnimatePresence initial={false}>
          <motion.span
            key={`text-${value}`}
            initial={reduce ? { opacity: 0 } : { opacity: 0, y: 14, filter: ROLL_BLUR }}
            animate={reduce ? { opacity: 1 } : { opacity: 1, y: 0, filter: "blur(0px)" }}
            exit={reduce ? { opacity: 0 } : { opacity: 0, y: -14, filter: ROLL_BLUR }}
            transition={reduce ? { duration: 0.15 } : SPRING_SWAP}
            className="absolute left-0 top-0 inline-block will-change-[opacity,filter,transform]"
          >
            {children}
          </motion.span>
        </AnimatePresence>
      )}
    </motion.span>
  );
}

export const StatefulButton = forwardRef<HTMLButtonElement, StatefulButtonProps>(function StatefulButton(
  {
    state = "idle",
    children,
    loadingText = "Loading",
    successText = "Done",
    errorText = "Try again",
    icon,
    disabled,
    ...rest
  },
  ref,
) {
  const isBusy = state === "loading";
  const stateText =
    state === "loading"
      ? loadingText
      : state === "success"
        ? successText
        : state === "error"
        ? errorText
        : children;
  const textKey =
    typeof stateText === "string" ? `${state}-${stateText}` : state;

  return (
    <Button ref={ref} disabled={disabled || isBusy} aria-busy={isBusy} whileHover={undefined} {...rest}>
      <span
        aria-live="polite"
        className="relative inline-flex items-center justify-center overflow-hidden"
      >
        <AnimatePresence initial={false}>
          {state === "loading" ? (
            <IconSlot keyId="loading-icon">
              <Loader2 className="h-4 w-4 animate-spin" />
            </IconSlot>
          ) : null}
          {state === "success" ? (
            <IconSlot keyId="success-icon">
              <Check className="h-4 w-4" />
            </IconSlot>
          ) : null}
          {state === "error" ? (
            <IconSlot keyId="error-icon">
              <X className="h-4 w-4" />
            </IconSlot>
          ) : null}
        </AnimatePresence>

        <TextSlot value={textKey}>{stateText}</TextSlot>

        <AnimatePresence initial={false}>
          {state === "idle" && icon ? (
            <IconSlot keyId="idle-icon">{icon}</IconSlot>
          ) : null}
        </AnimatePresence>
      </span>
    </Button>
  );
});
```

### `components/motion/magnetic.tsx`

```tsx
"use client";

import { motion, useMotionValue, useReducedMotion, useSpring } from "motion/react";
import { useRef, type ReactNode } from "react";
import { SPRING_MOUSE } from "@/lib/ease";
import { useHoverCapable } from "@/lib/hooks/use-hover-capable";
import { cn } from "@/lib/utils";

export interface MagneticProps {
  children: ReactNode;
  strength?: number;
  className?: string;
}

export function Magnetic({ children, strength = 0.35, className }: MagneticProps) {
  const ref = useRef<HTMLDivElement>(null);
  const reduce = useReducedMotion();
  const canHover = useHoverCapable();
  // Decorative cursor-follow: skip on touch (phantom hover) and reduced motion.
  const enabled = !reduce && canHover;
  const x = useMotionValue(0);
  const y = useMotionValue(0);
  const sx = useSpring(x, SPRING_MOUSE);
  const sy = useSpring(y, SPRING_MOUSE);

  const onMove = (e: React.MouseEvent<HTMLDivElement>) => {
    const el = ref.current;
    if (!el || !enabled) return;
    const rect = el.getBoundingClientRect();
    x.set((e.clientX - rect.left - rect.width / 2) * strength);
    y.set((e.clientY - rect.top - rect.height / 2) * strength);
  };

  const onLeave = () => {
    x.set(0);
    y.set(0);
  };

  return (
    <motion.div
      ref={ref}
      onMouseMove={onMove}
      onMouseLeave={onLeave}
      style={{ x: sx, y: sy }}
      className={cn("inline-block", className)}
    >
      {children}
    </motion.div>
  );
}
```