Footer de vidrio con suscripción

"use client";

import { useId, useState, type CSSProperties } from "react";

/** Footer de vidrio esmerilado con suscripción por correo, enlaces y redes, pensado para ir sobre un fondo de color. Glassmorfismo. React + TypeScript, sin dependencias. */
export type FooterVidrioProps = {
  brand?: string;
  title?: string;
  links?: { label: string; href?: string }[];
  legal?: string;
  onSubscribe?: (email: string) => void;
  className?: string;
  style?: CSSProperties;
};

const CSS = `
.gcfvi-root { box-sizing: border-box; container-type: inline-size; width: 100%; padding: clamp(14px, 4cqi, 40px); color: #fff; font: 500 15px/1.5 ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif; }
.gcfvi-root *, .gcfvi-root *::before, .gcfvi-root *::after { box-sizing: border-box; }
.gcfvi-root input, .gcfvi-root button { font: inherit; }
.gcfvi-root :focus-visible { outline: 2px solid #fff; outline-offset: 3px; }
@media (prefers-reduced-motion: reduce) { .gcfvi-root *, .gcfvi-root *::before, .gcfvi-root *::after { transition-duration: .01ms !important; } }
.gcfvi-panel { padding: clamp(22px, 4cqi, 44px); border-radius: 28px; background: rgba(255, 255, 255, .13); -webkit-backdrop-filter: blur(22px) saturate(1.7); backdrop-filter: blur(22px) saturate(1.7); box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .3), inset 0 1px 0 rgba(255, 255, 255, .55), 0 30px 50px -24px rgba(10, 10, 60, .55); text-shadow: 0 1px 2px rgba(10, 10, 60, .2); }
.gcfvi-top { display: grid; grid-template-columns: 1.2fr 1fr; gap: 32px; align-items: end; }
.gcfvi-title { margin: 0 0 6px; font: 700 clamp(24px, 3.6cqi, 38px)/1.1 ui-sans-serif, system-ui, sans-serif; letter-spacing: -.03em; text-wrap: balance; }
.gcfvi-sub { margin: 0; opacity: .85; }
.gcfvi-form { display: flex; gap: 8px; padding: 6px; border-radius: 999px; background: rgba(255, 255, 255, .16); box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .3); }
.gcfvi-input { flex: 1; min-width: 0; padding: 0 16px; border: 0; background: transparent; color: #fff; outline: 0; }
.gcfvi-input::placeholder { color: rgba(255, 255, 255, .75); }
.gcfvi-go { min-height: 44px; padding: 0 22px; border: 0; border-radius: 999px; background: #fff; color: #2a2370; font-weight: 700; cursor: pointer; text-shadow: none; transition: transform .25s cubic-bezier(.16, 1, .3, 1); }
.gcfvi-go:hover { transform: scale(1.04); }
.gcfvi-msg { min-height: 20px; margin: 8px 16px 0; font-size: 13px; }
.gcfvi-bottom { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 14px 24px; margin-top: 28px; padding-top: 20px; border-top: 1px solid rgba(255, 255, 255, .3); font-size: 14px; }
.gcfvi-links { display: flex; flex-wrap: wrap; gap: 6px 22px; margin: 0; padding: 0; list-style: none; }
.gcfvi-links a { color: inherit; text-decoration: none; opacity: .9; }
.gcfvi-links a:hover { opacity: 1; text-decoration: underline; text-underline-offset: 4px; }
@container (max-width: 700px) { .gcfvi-top { grid-template-columns: 1fr; } }`;

export function FooterVidrio({ brand = "Nube", title = "Recibe una carta al mes.", links = [{ label: "Producto" }, { label: "Precios" }, { label: "Contacto" }, { label: "Privacidad" }], legal = "© 2026 Nube", onSubscribe, className = "", style }: FooterVidrioProps) {
  const id = useId();
  const [email, setEmail] = useState("");
  const [msg, setMsg] = useState("");
  function submit(event: React.FormEvent) {
    event.preventDefault();
    if (!/^\S+@\S+\.\S+$/.test(email)) {
      setMsg("Escribe un correo válido, por ejemplo nombre@dominio.com.");
      return;
    }
    onSubscribe?.(email);
    setMsg("Listo. Te escribiremos pronto.");
    setEmail("");
  }
  return (
    <footer className={`gcfvi-root ${className}`} style={style}>
      <style>{CSS}</style>
      <div className="gcfvi-panel">
        <div className="gcfvi-top">
          <div>
            <h2 className="gcfvi-title">{title}</h2>
            <p className="gcfvi-sub">Ideas, no ruido. Cancela cuando quieras.</p>
          </div>
          <form onSubmit={submit} noValidate>
            <div className="gcfvi-form">
              <label htmlFor={id} className="sr-only" style={{ position: "absolute", width: 1, height: 1, overflow: "hidden", clip: "rect(0 0 0 0)" }}>
                Correo electrónico
              </label>
              <input id={id} className="gcfvi-input" type="email" placeholder="tu@correo.com" value={email} onChange={(event) => setEmail(event.target.value)} />
              <button className="gcfvi-go" type="submit">
                Suscribirme
              </button>
            </div>
            <p className="gcfvi-msg" role="status">
              {msg}
            </p>
          </form>
        </div>
        <div className="gcfvi-bottom">
          <strong>{brand}</strong>
          <ul className="gcfvi-links">
            {links.map((link) => (
              <li key={link.label}>
                <a href={link.href ?? "#"} onClick={(event) => !link.href && event.preventDefault()}>
                  {link.label}
                </a>
              </li>
            ))}
          </ul>
          <span>{legal}</span>
        </div>
      </div>
    </footer>
  );
}

npx shadcn@latest add https://www.gassierconsulting.com/r/footer-vidrio

import { FooterVidrio } from "./footer-vidrio";

export default function Ejemplo() {
  return <FooterVidrio brand="Ejemplo" />;
}