Checkout pages for React shops

'use client';

import { useEffect, useId, useRef, useState } from 'react';
import { cn, round, useInView, useLocale, useTexts } from '@/lib/kit';
import { Button } from '@/components/ui/button';
import { Icon, type IconName } from '@/components/ui/icon';
import { Reveal } from '@/components/ui/reveal';
import { Stagger } from '@/components/ui/motion';
import { ProductMedia, ShopMotion, Swap, TweenPrice, formatPrice, vatOf, type LineItem } from '@/components/ui/product-image';
import { CART_TEXTS, SummaryLines, computeTotals } from '@/components/ui/cart';

export type CheckoutVariant = 'one-page' | 'two-column' | 'multi-step' | 'express' | 'confirmation';

export interface ShippingOption {
  id: string;
  label: string;
  /** e.g. "Thu, 23 Oct" or "2 to 3 working days" */
  note: string;
  price: number;
}

export interface PaymentOption {
  id: string;
  label: string;
  note?: string;
  icon: IconName;
  /** card shows card fields */
  kind?: 'card' | 'other';
}

export interface CheckoutValues {
  email?: string;
  firstName?: string;
  lastName?: string;
  street?: string;
  zip?: string;
  city?: string;
  country?: string;
}

export interface OrderConfirmation {
  number: string;
  firstName: string;
  email: string;
  /** Delivery estimate, already formatted */
  delivery: string;
  address: string[];
  payment: string;
  shipping: string;
  /** Status steps, the first `done` of them are complete */
  steps: { label: string; date?: string }[];
  done: number;
}

export interface CheckoutProps {
  variant?: CheckoutVariant;
  items: LineItem[];
  shippingOptions?: ShippingOption[];
  paymentOptions?: PaymentOption[];
  /** express: neutral express buttons, text only */
  expressOptions?: { label: string; icon: IconName }[];
  /** Prefilled fields, e.g. for a signed-in customer */
  values?: CheckoutValues;
  countries?: string[];
  /** multi-step: start on this step (0 to 3) */
  initialStep?: number;
  /** confirmation */
  order?: OrderConfirmation;
  storeName?: React.ReactNode;
  freeShippingFrom?: number;
  vatRate?: number;
  currency?: string;
  /** Links in the legal line under the order button */
  legal?: { terms: string; withdrawal: string; privacy: string };
  onSubmit?: (data: Record<string, string>) => void;
  labels?: Partial<(typeof TEXTS)['en']>;
  className?: string;
}

const TEXTS = {
  en: {
    checkout: 'Checkout',
    secure: 'Secure checkout',
    contact: 'Contact',
    email: 'Email',
    emailHint: 'For your order confirmation and tracking link.',
    newsletter: 'Email me about new pieces and restocks',
    delivery: 'Delivery address',
    firstName: 'First name',
    lastName: 'Last name',
    street: 'Street and number',
    addressExtra: 'Apartment, floor (optional)',
    zip: 'Postcode',
    city: 'City',
    country: 'Country',
    phone: 'Phone (optional)',
    phoneHint: 'Only for the courier, if they cannot find you.',
    shippingMethod: 'Shipping',
    payment: 'Payment',
    paymentHint: 'All payments are encrypted.',
    cardNumber: 'Card number',
    expiry: 'Expiry (MM/YY)',
    cvc: 'Security code',
    cardName: 'Name on card',
    billingSame: 'Billing address is the same as delivery',
    summary: 'Order summary',
    showSummary: 'Show order summary',
    hideSummary: 'Hide order summary',
    placeOrder: 'Place order',
    placing: 'Placing your order',
    placed: 'Order placed',
    legal: 'By placing your order you agree to our {terms}. Read about your {withdrawal} and how we handle your data in our {privacy}.',
    terms: 'terms',
    withdrawal: 'right of withdrawal',
    privacy: 'privacy policy',
    required: 'Please fill in this field.',
    invalidEmail: 'This email address looks incomplete, e.g. name@example.com.',
    fixErrors: 'Some fields need your attention.',
    free: 'Free',
    continue: 'Continue',
    back: 'Back',
    change: 'Change',
    review: 'Review',
    information: 'Information',
    step: 'Step',
    of: 'of',
    reviewTitle: 'Check and place your order',
    express: 'Express checkout',
    expressHint: 'One tap, your saved address and payment.',
    orEmail: 'or continue with email',
    haveAccount: 'Have an account?',
    signIn: 'Sign in',
    continuePayment: 'Continue to delivery',
    thanks: 'Thank you, {name}!',
    confirmed: 'Order {number} is confirmed.',
    sentTo: 'We sent the confirmation to {email}.',
    arrives: 'Arrives',
    track: 'Track order',
    keepShopping: 'Continue shopping',
    yourOrder: 'Your order',
    details: 'Details',
    deliveredTo: 'Delivery address',
    paidWith: 'Payment',
    shippedWith: 'Shipping',
    account: 'Save your details for next time',
    accountText: 'Create an account with one click and track this order without the email.',
    createAccount: 'Create account',
    print: 'Print',
    qty: 'Qty',
  },
  de: {
    checkout: 'Kasse',
    secure: 'Sichere Kasse',
    contact: 'Kontakt',
    email: 'E-Mail',
    emailHint: 'Für deine Bestellbestätigung und den Link zur Sendung.',
    newsletter: 'Schreib mir bei neuen Stücken und Nachschub',
    delivery: 'Lieferadresse',
    firstName: 'Vorname',
    lastName: 'Nachname',
    street: 'Straße und Hausnummer',
    addressExtra: 'Adresszusatz (optional)',
    zip: 'PLZ',
    city: 'Ort',
    country: 'Land',
    phone: 'Telefon (optional)',
    phoneHint: 'Nur für den Paketdienst, falls er dich nicht findet.',
    shippingMethod: 'Versand',
    payment: 'Zahlung',
    paymentHint: 'Alle Zahlungen sind verschlüsselt.',
    cardNumber: 'Kartennummer',
    expiry: 'Gültig bis (MM/JJ)',
    cvc: 'Prüfnummer',
    cardName: 'Name auf der Karte',
    billingSame: 'Rechnungsadresse entspricht der Lieferadresse',
    summary: 'Bestellübersicht',
    showSummary: 'Bestellübersicht zeigen',
    hideSummary: 'Bestellübersicht ausblenden',
    placeOrder: 'Zahlungspflichtig bestellen',
    placing: 'Bestellung wird gesendet',
    placed: 'Bestellung aufgegeben',
    legal: 'Mit deiner Bestellung akzeptierst du unsere {terms}. Hinweise zum {withdrawal} und zum Umgang mit deinen Daten findest du in der {privacy}.',
    terms: 'AGB',
    withdrawal: 'Widerrufsrecht',
    privacy: 'Datenschutzerklärung',
    required: 'Bitte fülle dieses Feld aus.',
    invalidEmail: 'Diese E-Mail-Adresse wirkt unvollständig, zum Beispiel name@beispiel.de.',
    fixErrors: 'Ein paar Felder brauchen noch deine Aufmerksamkeit.',
    free: 'Kostenlos',
    continue: 'Weiter',
    back: 'Zurück',
    change: 'Ändern',
    review: 'Prüfen',
    information: 'Angaben',
    step: 'Schritt',
    of: 'von',
    reviewTitle: 'Prüfen und bestellen',
    express: 'Express-Kasse',
    expressHint: 'Ein Tipp, gespeicherte Adresse und Zahlung.',
    orEmail: 'oder mit E-Mail weiter',
    haveAccount: 'Schon ein Konto?',
    signIn: 'Anmelden',
    continuePayment: 'Weiter zur Lieferung',
    thanks: 'Danke, {name}!',
    confirmed: 'Deine Bestellung {number} ist bestätigt.',
    sentTo: 'Die Bestätigung ist unterwegs an {email}.',
    arrives: 'Ankunft',
    track: 'Sendung verfolgen',
    keepShopping: 'Weiter einkaufen',
    yourOrder: 'Deine Bestellung',
    details: 'Details',
    deliveredTo: 'Lieferadresse',
    paidWith: 'Zahlung',
    shippedWith: 'Versand',
    account: 'Daten fürs nächste Mal speichern',
    accountText: 'Leg mit einem Klick ein Konto an und verfolge diese Bestellung ohne E-Mail.',
    createAccount: 'Konto anlegen',
    print: 'Drucken',
    qty: 'Menge',
  },
};

type T = (typeof TEXTS)['en'];
const fill = (s: string, map: Record<string, React.ReactNode>) => {
  const parts = s.split(/(\{\w+\})/);
  return parts.map((p, i) => {
    const m = p.match(/^\{(\w+)\}$/);
    return m ? <span key={i}>{map[m[1]]}</span> : p;
  });
};
const fillText = (s: string, map: Record<string, string>) => s.replace(/\{(\w+)\}/g, (_, k) => map[k] ?? '');

/* ------------------------------------------------------------------ */
/* Form parts                                                          */
/* ------------------------------------------------------------------ */

const inputClass =
  'h-12 w-full rounded-lg border border-input bg-background px-3.5 text-[15px] text-foreground shadow-[var(--shadow-sm)] outline-none transition-[border-color,box-shadow] placeholder:text-subtle-foreground focus-visible:border-primary focus-visible:ring-4 focus-visible:ring-[color-mix(in_oklab,var(--primary)_16%,transparent)] aria-[invalid=true]:border-destructive aria-[invalid=true]:focus-visible:ring-[color-mix(in_oklch,var(--destructive)_16%,transparent)]';

function Field({ label, name, type = 'text', autoComplete, hint, error, defaultValue, className, inputMode, placeholder, onChange, value, required = true }: {
  label: string;
  name: string;
  type?: string;
  autoComplete?: string;
  hint?: string;
  error?: string;
  defaultValue?: string;
  className?: string;
  inputMode?: React.HTMLAttributes<HTMLInputElement>['inputMode'];
  placeholder?: string;
  onChange?: (v: string) => void;
  value?: string;
  required?: boolean;
}) {
  const id = useId();
  return (
    <div className={className}>
      <ShopMotion />
      <label htmlFor={id} className="mb-1.5 block text-[13px] font-medium text-foreground">
        {label}
      </label>
      <input
        id={id}
        name={name}
        type={type}
        autoComplete={autoComplete}
        inputMode={inputMode}
        placeholder={placeholder}
        required={required}
        defaultValue={value === undefined ? defaultValue : undefined}
        value={value}
        onChange={onChange ? (e) => onChange(e.target.value) : undefined}
        aria-invalid={!!error}
        aria-describedby={hint || error ? `${id}-d` : undefined}
        className={cn(inputClass, 'aria-[invalid=true]:animate-[kitshop-shake_0.42s_var(--ease-kit)]')}
      />
      {(error || hint) && (
        <p key={error ? 'e' : 'h'} id={`${id}-d`} className={cn('mt-1.5 flex items-start gap-1.5 text-[12px]', error ? 'animate-[kitshop-in_0.35s_var(--ease-kit)] text-destructive' : 'text-muted-foreground')}>
          {error && <Icon name="alert-circle" size={13} className="mt-px" />}
          {error ?? hint}
        </p>
      )}
    </div>
  );
}

function SelectField({ label, name, options, defaultValue, autoComplete }: { label: string; name: string; options: string[]; defaultValue?: string; autoComplete?: string }) {
  const id = useId();
  return (
    <div>
      <label htmlFor={id} className="mb-1.5 block text-[13px] font-medium text-foreground">
        {label}
      </label>
      <div className="relative">
        <select id={id} name={name} defaultValue={defaultValue ?? options[0]} autoComplete={autoComplete} className={cn(inputClass, 'appearance-none pr-10')}>
          {options.map((o) => (
            <option key={o}>{o}</option>
          ))}
        </select>
        <Icon name="chevrons-up-down" size={15} className="pointer-events-none absolute right-3.5 top-1/2 -translate-y-1/2 text-muted-foreground" />
      </div>
    </div>
  );
}

function Check({ label, name, defaultChecked }: { label: string; name: string; defaultChecked?: boolean }) {
  return (
    <label className="flex min-h-11 cursor-pointer items-center gap-3 text-[14px] text-foreground">
      <input type="checkbox" name={name} defaultChecked={defaultChecked} className="peer sr-only" />
      <span aria-hidden className="grid size-5 shrink-0 place-items-center rounded-[6px] border border-border-strong bg-background text-transparent transition-colors peer-checked:border-primary peer-checked:bg-primary peer-checked:text-primary-foreground peer-focus-visible:outline-2 peer-focus-visible:outline-offset-2 peer-focus-visible:outline-[var(--ring)]">
        <Icon name="check" size={13} strokeWidth={2.4} />
      </span>
      {label}
    </label>
  );
}

/** Radio options as stacked rows in one frame. The picked row can unfold extra fields. */
function RadioCards<O extends { id: string; label: string; note?: string }>({ name, options, value, onChange, right, icon, legend, expand }: {
  name: string;
  options: O[];
  value: string;
  onChange: (id: string) => void;
  right?: (o: O) => React.ReactNode;
  icon?: (o: O) => IconName | undefined;
  legend: string;
  expand?: (o: O) => React.ReactNode;
}) {
  // One frame glides to the picked row and follows its height when it unfolds.
  // Until it is measured, the picked row draws its own frame.
  const box = useRef<HTMLDivElement>(null);
  const index = options.findIndex((o) => o.id === value);
  const [mark, setMark] = useState<{ y: number; h: number; ready: boolean } | null>(null);
  useEffect(() => {
    const el = box.current;
    if (!el) return;
    const update = () => {
      const row = el.querySelectorAll<HTMLElement>(':scope > [data-row]')[index];
      if (!row) return setMark(null);
      setMark((m) => ({ y: row.offsetTop, h: row.offsetHeight, ready: !!m }));
    };
    update();
    const ro = new ResizeObserver(update);
    ro.observe(el);
    return () => ro.disconnect();
  }, [index]);
  return (
    <fieldset className="min-w-0">
      <legend className="sr-only">{legend}</legend>
      <ShopMotion />
      <div ref={box} className="relative overflow-hidden rounded-xl border border-border-strong">
        {options.map((o, n) => {
          const on = value === o.id;
          const ic = icon?.(o);
          const more = on ? expand?.(o) : null;
          return (
            <div key={o.id} data-row className={cn('relative transition-colors duration-300', n > 0 && 'border-t border-border', on && 'bg-[color-mix(in_oklab,var(--primary)_5%,var(--background))]')}>
              <label className={cn('relative flex min-h-16 cursor-pointer items-center gap-3.5 px-4 py-3.5 transition-colors has-[:focus-visible]:z-10 has-[:focus-visible]:outline-2 has-[:focus-visible]:-outline-offset-2 has-[:focus-visible]:outline-[var(--ring)]', !on && 'hover:bg-surface')}>
                <input type="radio" name={name} value={o.id} checked={on} onChange={() => onChange(o.id)} className="sr-only" />
                <span aria-hidden className={cn('grid size-[18px] shrink-0 place-items-center rounded-full border transition-colors', on ? 'border-primary bg-primary' : 'border-border-strong bg-background')}>
                  <span className={cn('size-1.5 rounded-full bg-primary-foreground transition-transform', on ? 'scale-100' : 'scale-0')} />
                </span>
                {ic && <Icon name={ic} size={18} className="text-muted-foreground" />}
                <span className="min-w-0 flex-1">
                  <span className="block text-[14px] font-medium text-foreground">{o.label}</span>
                  {o.note && <span className="block text-[13px] text-muted-foreground">{o.note}</span>}
                </span>
                {right?.(o)}
              </label>
              {more && <div className="kit-rise px-4 pb-4 [animation-duration:0.4s]">{more}</div>}
              {on && !mark && <span aria-hidden className={cn('pointer-events-none absolute inset-x-0 bottom-0 z-10 border-[1.5px] border-primary', n > 0 ? '-top-px' : 'top-0 rounded-t-[11px]', n === options.length - 1 && 'rounded-b-[11px]')} />}
            </div>
          );
        })}
        {mark && (
          <span
            aria-hidden
            className={cn('pointer-events-none absolute inset-x-0 top-0 z-10 rounded-[11px] border-[1.5px] border-primary', mark.ready && 'transition-[transform,height] duration-500 ease-[var(--ease-kit)] motion-reduce:transition-none')}
            style={{ transform: `translateY(${mark.y}px)`, height: mark.h }}
          />
        )}
      </div>
    </fieldset>
  );
}

function CardFields({ t }: { t: T }) {
  const [num, setNum] = useState('');
  const [exp, setExp] = useState('');
  return (
    <div className="grid grid-cols-2 gap-3 border-t border-border pt-4">
      <Field
        label={t.cardNumber}
        name="cc-number"
        autoComplete="cc-number"
        inputMode="numeric"
        placeholder="1234 5678 9012 3456"
        className="col-span-2"
        value={num}
        onChange={(v) => setNum(v.replace(/\D/g, '').slice(0, 16).replace(/(\d{4})(?=\d)/g, '$1 '))}
      />
      <Field label={t.expiry} name="cc-exp" autoComplete="cc-exp" inputMode="numeric" placeholder="08/29" value={exp} onChange={(v) => { const d = v.replace(/\D/g, '').slice(0, 4); setExp(d.length > 2 ? `${d.slice(0, 2)}/${d.slice(2)}` : d); }} />
      <Field label={t.cvc} name="cc-csc" autoComplete="cc-csc" inputMode="numeric" placeholder="123" />
      <Field label={t.cardName} name="cc-name" autoComplete="cc-name" className="col-span-2" />
    </div>
  );
}

function Group({ n, title, children, aside }: { n?: number; title: string; children: React.ReactNode; aside?: React.ReactNode }) {
  return (
    <section className="py-8 first:pt-0">
      {/* Scroll: each part of the form rises in as it is reached, the divider line stays */}
      <Reveal>
      <div className="mb-5 flex items-baseline justify-between gap-4">
        <h2 className="flex items-baseline gap-3 text-[18px] font-semibold tracking-[-0.015em] text-foreground">
          {n !== undefined && <span className="text-[12px] font-medium tabular-nums text-subtle-foreground">0{n}</span>}
          {title}
        </h2>
        {aside}
      </div>
      {children}
      </Reveal>
    </section>
  );
}

/* ------------------------------------------------------------------ */
/* Shared checkout state and sections                                  */
/* ------------------------------------------------------------------ */

function useCheckout(props: CheckoutProps) {
  const [ship, setShip] = useState(props.shippingOptions?.[0]?.id ?? '');
  const [pay, setPay] = useState(props.paymentOptions?.[0]?.id ?? '');
  const shipping = props.shippingOptions?.find((s) => s.id === ship);
  const base = computeTotals(props.items, {});
  const first = props.shippingOptions?.[0];
  // The standard option becomes free above the threshold, faster options keep their price
  const shipCost = !shipping ? 0 : shipping.id === first?.id && props.freeShippingFrom !== undefined && base.subtotal >= props.freeShippingFrom ? 0 : shipping.price;
  const total = round(base.subtotal + shipCost);
  return { ship, setShip, pay, setPay, shipping, totals: { ...base, shipping: shipCost, total, vat: vatOf(total, props.vatRate ?? 19) } };
}

type Errors = Record<string, string>;

function validate(form: HTMLFormElement, t: T): Errors {
  const errors: Errors = {};
  for (const el of Array.from(form.elements) as HTMLInputElement[]) {
    if (!el.name || !el.required) continue;
    if (!el.value.trim()) errors[el.name] = t.required;
    else if (el.type === 'email' && !/^\S+@\S+\.\S+$/.test(el.value)) errors[el.name] = t.invalidEmail;
  }
  return errors;
}

function ContactFields({ t, v, e }: { t: T; v?: CheckoutValues; e: Errors }) {
  return (
    <div className="space-y-2">
      <Field label={t.email} name="email" type="email" autoComplete="email" hint={t.emailHint} defaultValue={v?.email} error={e.email} />
      <Check label={t.newsletter} name="newsletter" />
    </div>
  );
}

function AddressFields({ t, v, e, countries }: { t: T; v?: CheckoutValues; e: Errors; countries: string[] }) {
  return (
    <div className="grid grid-cols-2 gap-x-3 gap-y-4">
      <Field label={t.firstName} name="firstName" autoComplete="given-name" defaultValue={v?.firstName} error={e.firstName} />
      <Field label={t.lastName} name="lastName" autoComplete="family-name" defaultValue={v?.lastName} error={e.lastName} />
      <Field label={t.street} name="street" autoComplete="address-line1" defaultValue={v?.street} error={e.street} className="col-span-2" />
      <Field label={t.addressExtra} name="extra" autoComplete="address-line2" required={false} className="col-span-2" />
      <Field label={t.zip} name="zip" autoComplete="postal-code" inputMode="numeric" defaultValue={v?.zip} error={e.zip} />
      <Field label={t.city} name="city" autoComplete="address-level2" defaultValue={v?.city} error={e.city} />
      <div className="col-span-2">
        <SelectField label={t.country} name="country" options={countries} defaultValue={v?.country} autoComplete="country-name" />
      </div>
      <Field label={t.phone} name="phone" type="tel" autoComplete="tel" hint={t.phoneHint} required={false} className="col-span-2" />
    </div>
  );
}

function ShippingFields({ t, props, c }: { t: T; props: CheckoutProps; c: ReturnType<typeof useCheckout> }) {
  const locale = useLocale();
  if (!props.shippingOptions?.length) return null;
  const free = (o: ShippingOption) => o.id === props.shippingOptions![0].id && props.freeShippingFrom !== undefined && c.totals.subtotal >= props.freeShippingFrom;
  return (
    <RadioCards
      legend={t.shippingMethod}
      name="shipping"
      options={props.shippingOptions}
      value={c.ship}
      onChange={c.setShip}
      right={(o) => <span className={cn('text-[14px] font-medium tabular-nums', free(o) || o.price === 0 ? 'text-[color-mix(in_oklab,var(--success)_70%,var(--foreground))] dark:text-success' : 'text-foreground')}>{free(o) || o.price === 0 ? t.free : formatPrice(locale, o.price, props.currency)}</span>}
    />
  );
}

function PaymentFields({ t, props, c }: { t: T; props: CheckoutProps; c: ReturnType<typeof useCheckout> }) {
  if (!props.paymentOptions?.length) return null;
  return (
    <div>
      <RadioCards legend={t.payment} name="payment" options={props.paymentOptions} value={c.pay} onChange={c.setPay} icon={(o) => o.icon} expand={(o) => (o.kind === 'card' ? <CardFields t={t} /> : null)} />
      <div className="mt-3">
        <Check label={t.billingSame} name="billingSame" defaultChecked />
      </div>
    </div>
  );
}

function Legal({ t, legal }: { t: T; legal?: CheckoutProps['legal'] }) {
  const a = (href: string | undefined, label: string) => (
    <a href={href ?? '#'} className="underline decoration-border-strong underline-offset-2 hover:text-foreground">
      {label}
    </a>
  );
  return <p className="text-pretty text-[12px] leading-relaxed text-muted-foreground">{fill(t.legal, { terms: a(legal?.terms, t.terms), withdrawal: a(legal?.withdrawal, t.withdrawal), privacy: a(legal?.privacy, t.privacy) })}</p>;
}

/** The order button. It counts to a new total, shows a spinner while sending and a check when done. */
function PlaceOrder({ t, total, currency, className, status = 'idle' }: { t: T; total: number; currency?: string; className?: string; status?: Status }) {
  return (
    <Button type="submit" size="lg" aria-disabled={status !== 'idle' || undefined} className={cn('w-full overflow-hidden', status === 'done' && 'bg-success text-background hover:bg-success', className)}>
      <Swap value={status} className="min-w-0 gap-2">
        {status === 'sending' ? (
          <span aria-hidden className="size-[17px] shrink-0 animate-kit-spin rounded-full border-2 border-current border-r-transparent [--kit-duration:0.8s] motion-reduce:animate-none" />
        ) : (
          <Icon name={status === 'done' ? 'check' : 'lock'} size={17} className="shrink-0" />
        )}
        <span className="truncate">
          {status === 'sending' ? t.placing : status === 'done' ? t.placed : (
            <>
              {t.placeOrder} · <TweenPrice value={total} currency={currency} />
            </>
          )}
        </span>
      </Swap>
    </Button>
  );
}

function Summary({ props, totals, t, compact }: { props: CheckoutProps; totals: ReturnType<typeof useCheckout>['totals']; t: T; compact?: boolean }) {
  const ct = useTexts(CART_TEXTS);
  return (
    <div>
      <Stagger as="ul" step={80} className={cn('divide-y divide-border', compact && '-my-1')}>
        {props.items.map((i) => (
          <li key={i.id} className="flex items-center gap-3.5 py-3">
            <div className="relative shrink-0">
              <ProductMedia className="size-16 rounded-lg border border-border">{i.image}</ProductMedia>
              <span className="absolute -right-1.5 -top-1.5 grid size-5 place-items-center rounded-full bg-foreground text-[11px] font-semibold tabular-nums text-background" aria-label={`${t.qty} ${i.quantity}`}>
                {i.quantity}
              </span>
            </div>
            <div className="min-w-0 flex-1">
              <p className="truncate text-[14px] font-medium text-foreground">{i.name}</p>
              {i.variant && <p className="truncate text-[12px] text-muted-foreground">{i.variant}</p>}
            </div>
            <p className="text-[14px] tabular-nums text-foreground">
              <SummaryPrice value={i.price * i.quantity} currency={props.currency} />
            </p>
          </li>
        ))}
      </Stagger>
      <div className="mt-4 border-t border-border pt-4">
        <SummaryLines totals={totals} currency={props.currency} t={ct} vatRate={props.vatRate} />
      </div>
    </div>
  );
}

function SummaryPrice({ value, currency }: { value: number; currency?: string }) {
  const locale = useLocale();
  return <>{formatPrice(locale, value, currency)}</>;
}

function Head({ props, t, className }: { props: CheckoutProps; t: T; className?: string }) {
  return (
    <div className={cn('flex items-center justify-between gap-4', className)}>
      <span className="text-[18px] font-semibold tracking-[-0.02em] text-foreground">{props.storeName}</span>
      <span className="inline-flex items-center gap-1.5 text-[13px] text-muted-foreground">
        <Icon name="lock" size={14} />
        {t.secure}
      </span>
    </div>
  );
}

function ErrorBanner({ show, t, attempt = 0 }: { show: boolean; t: T; attempt?: number }) {
  if (!show) return null;
  return (
    <p key={attempt} role="alert" className="mb-6 flex animate-[kitshop-in_0.4s_var(--ease-kit)] items-center gap-2.5 rounded-lg border border-[color-mix(in_oklch,var(--destructive)_35%,transparent)] bg-[color-mix(in_oklch,var(--destructive)_7%,transparent)] px-4 py-3 text-[14px] text-foreground">
      <Icon name="alert-circle" size={17} className="text-destructive" />
      {t.fixErrors}
    </p>
  );
}

type Status = 'idle' | 'sending' | 'done';

function useSubmit(props: CheckoutProps, t: T) {
  const [errors, setErrors] = useState<Errors>({});
  const [attempt, setAttempt] = useState(0);
  const [status, setStatus] = useState<Status>('idle');
  const timer = useRef<ReturnType<typeof setTimeout>>(undefined);
  useEffect(() => () => clearTimeout(timer.current), []);
  const onSubmit = (e: React.FormEvent<HTMLFormElement>) => {
    e.preventDefault();
    if (status !== 'idle') return;
    const errs = validate(e.currentTarget, t);
    setErrors(errs);
    setAttempt((a) => a + 1);
    if (Object.keys(errs).length) {
      const form = e.currentTarget;
      requestAnimationFrame(() => (form.querySelector('[aria-invalid="true"]') as HTMLElement | null)?.focus());
      return;
    }
    const data = Object.fromEntries(new FormData(e.currentTarget).entries()) as Record<string, string>;
    // A short sending state, then the confirmation on the button
    setStatus('sending');
    timer.current = setTimeout(() => {
      setStatus('done');
      props.onSubmit?.(data);
    }, 1100);
  };
  return { errors, onSubmit, attempt, status };
}

const COUNTRIES = { en: ['Germany', 'Austria', 'Switzerland', 'Netherlands', 'France'], de: ['Deutschland', 'Österreich', 'Schweiz', 'Niederlande', 'Frankreich'] };

/* ------------------------------------------------------------------ */
/* Variants                                                            */
/* ------------------------------------------------------------------ */

function OnePage(props: CheckoutProps & { t: T }) {
  const { t } = props;
  const locale = useLocale();
  const c = useCheckout(props);
  const { errors, onSubmit, attempt, status } = useSubmit(props, t);
  const countries = props.countries ?? COUNTRIES[locale];
  return (
    <section className={cn('bg-background pb-20 pt-8 sm:bg-surface sm:pt-12 lg:pb-28', props.className)}>
      <div className="mx-auto w-full max-w-[40rem] px-6">
        <Head props={props} t={t} className="mb-8" />
        <form noValidate onSubmit={onSubmit} className="sm:rounded-2xl sm:border sm:border-border sm:bg-card sm:px-8 sm:py-8 sm:shadow-[var(--highlight),var(--shadow-md)]">
          <h1 className="mb-8 text-[28px] font-semibold tracking-[-0.025em] text-foreground">{t.checkout}</h1>
          <ErrorBanner show={Object.keys(errors).length > 0} t={t} attempt={attempt} />
          <div className="divide-y divide-border">
            <Group n={1} title={t.contact}>
              <ContactFields t={t} v={props.values} e={errors} />
            </Group>
            <Group n={2} title={t.delivery}>
              <AddressFields t={t} v={props.values} e={errors} countries={countries} />
            </Group>
            <Group n={3} title={t.shippingMethod}>
              <ShippingFields t={t} props={props} c={c} />
            </Group>
            <Group n={4} title={t.payment} aside={<span className="text-[12px] text-muted-foreground max-sm:hidden">{t.paymentHint}</span>}>
              <PaymentFields t={t} props={props} c={c} />
            </Group>
            <Group title={t.summary}>
              <Summary props={props} totals={c.totals} t={t} />
            </Group>
          </div>
          <PlaceOrder t={t} total={c.totals.total} currency={props.currency} className="mt-2" status={status} />
          <div className="mt-4">
            <Legal t={t} legal={props.legal} />
          </div>
        </form>
      </div>
    </section>
  );
}

function TwoColumn(props: CheckoutProps & { t: T }) {
  const { t } = props;
  const locale = useLocale();
  const c = useCheckout(props);
  const { errors, onSubmit, attempt, status } = useSubmit(props, t);
  const [open, setOpen] = useState(false);
  const countries = props.countries ?? COUNTRIES[locale];
  return (
    <section className={cn('relative', props.className)}>
      {/* the summary side runs to the right edge on desktop */}
      <div aria-hidden className="absolute inset-y-0 right-0 hidden w-[calc(50%-1rem)] border-l border-border bg-surface lg:block xl:w-[calc(50%-2.5rem)]" />
      <div className="kit-container relative">
        {/* Phone and tablet: the summary folds out at the top */}
        <div className="-mx-6 border-b border-border bg-surface lg:hidden">
          <button type="button" aria-expanded={open} onClick={() => setOpen(!open)} className="flex min-h-14 w-full items-center justify-between gap-4 px-6 text-[14px]">
            <span className="flex items-center gap-2 font-medium text-foreground">
              <Icon name="bag" size={17} />
              {open ? t.hideSummary : t.showSummary}
              <Icon name="chevron-down" size={15} className={cn('text-muted-foreground transition-transform motion-reduce:transition-none', open && 'rotate-180')} />
            </span>
            <TweenPrice value={c.totals.total} currency={props.currency} className="text-[16px] font-semibold text-foreground" />
          </button>
          <div className={cn('grid transition-[grid-template-rows] duration-300 ease-[var(--ease-kit)] motion-reduce:transition-none', open ? 'grid-rows-[1fr]' : 'grid-rows-[0fr]')}>
            <div className="overflow-hidden">
              <div className="mx-auto max-w-[38rem] px-6 pb-6" inert={!open}>
                <Summary props={props} totals={c.totals} t={t} />
              </div>
            </div>
          </div>
        </div>

        <div className="grid grid-cols-1 lg:grid-cols-2">
          <form noValidate onSubmit={onSubmit} className="w-full py-10 max-lg:mx-auto max-lg:max-w-[38rem] lg:py-14 lg:pr-14 xl:pr-20">
            <Head props={props} t={t} className="mb-10" />
            <ErrorBanner show={Object.keys(errors).length > 0} t={t} attempt={attempt} />
            <div className="divide-y divide-border">
              <Group title={t.contact} aside={<a href="#" className="text-[13px] text-muted-foreground underline decoration-border-strong underline-offset-4 hover:text-foreground">{t.signIn}</a>}>
                <ContactFields t={t} v={props.values} e={errors} />
              </Group>
              <Group title={t.delivery}>
                <AddressFields t={t} v={props.values} e={errors} countries={countries} />
              </Group>
              <Group title={t.shippingMethod}>
                <ShippingFields t={t} props={props} c={c} />
              </Group>
              <Group title={t.payment} aside={<span className="text-[12px] text-muted-foreground max-sm:hidden">{t.paymentHint}</span>}>
                <PaymentFields t={t} props={props} c={c} />
              </Group>
            </div>
            <PlaceOrder t={t} total={c.totals.total} currency={props.currency} className="mt-2" status={status} />
            <div className="mt-4">
              <Legal t={t} legal={props.legal} />
            </div>
          </form>
          <aside className="max-lg:hidden lg:py-14 lg:pl-14 xl:pl-20" aria-label={t.summary}>
            <div className="sticky top-10">
              <h2 className="mb-4 text-[16px] font-semibold text-foreground">{t.summary}</h2>
              <Summary props={props} totals={c.totals} t={t} />
            </div>
          </aside>
        </div>
      </div>
    </section>
  );
}

function MultiStep(props: CheckoutProps & { t: T }) {
  const { t } = props;
  const locale = useLocale();
  const c = useCheckout(props);
  const [step, setStepRaw] = useState(props.initialStep ?? 0);
  // Forward slides in from the right, back from the left
  const [dir, setDir] = useState<0 | 1 | -1>(0);
  const setStep = (n: number) => {
    setDir(n > step ? 1 : -1);
    setStepRaw(n);
  };
  const [errors, setErrors] = useState<Errors>({});
  const [data, setData] = useState<Record<string, string>>({ ...(props.values as Record<string, string>) });
  const [summaryOpen, setSummaryOpen] = useState(false);
  const countries = props.countries ?? COUNTRIES[locale];
  const steps = [t.information, t.shippingMethod, t.payment, t.review];
  const fp = (n: number) => formatPrice(locale, n, props.currency);

  const next = (e: React.FormEvent<HTMLFormElement>) => {
    e.preventDefault();
    const errs = validate(e.currentTarget, t);
    setErrors(errs);
    if (Object.keys(errs).length) return;
    // Read the fields now, the event target is gone once React runs the updater
    const fields = Object.fromEntries(new FormData(e.currentTarget).entries()) as Record<string, string>;
    setData((d) => ({ ...d, ...fields }));
    if (step < 3) setStep(step + 1);
    else props.onSubmit?.(data);
  };

  const row = (label: string, value: React.ReactNode, to: number) => (
    <div className="flex items-start gap-4 py-4">
      <dt className="w-24 shrink-0 text-[13px] text-muted-foreground sm:w-32">{label}</dt>
      <dd className="min-w-0 flex-1 text-[14px] text-foreground">{value}</dd>
      <button type="button" onClick={() => setStep(to)} className="-my-2 h-9 shrink-0 rounded-md px-2 text-[13px] font-medium text-foreground underline decoration-border-strong underline-offset-4 hover:bg-accent">
        {t.change}
      </button>
    </div>
  );

  const shipping = props.shippingOptions?.find((s) => s.id === c.ship);
  const payment = props.paymentOptions?.find((p) => p.id === c.pay);

  return (
    <section className={cn('pb-20 pt-8 sm:pt-12 lg:pb-28', props.className)}>
      <div className="kit-container">
        <Head props={props} t={t} className="mb-10" />
        <div className="grid grid-cols-1 gap-10 lg:grid-cols-[minmax(0,1fr)_22rem] lg:gap-14">
          <div className="min-w-0">
            <nav aria-label={t.checkout} className="mb-10">
              <ol className="grid grid-cols-4 gap-2">
                {steps.map((s, n) => {
                  const done = n < step;
                  const on = n === step;
                  return (
                    <li key={s}>
                      <button type="button" disabled={n > step} onClick={() => setStep(n)} aria-current={on ? 'step' : undefined} className="group w-full text-left disabled:cursor-default">
                        <span className="block h-1 overflow-hidden rounded-full bg-track">
                          <span className={cn('block h-full origin-left rounded-full bg-primary transition-transform duration-700 ease-[var(--ease-kit)] motion-reduce:transition-none', done ? 'scale-x-100' : on ? 'scale-x-50' : 'scale-x-0')} style={{ transitionDelay: done ? '0ms' : '160ms' }} />
                        </span>
                        <span className={cn('mt-2.5 flex items-center gap-1.5 text-[12px] sm:text-[13px]', on ? 'font-medium text-foreground' : done ? 'text-foreground' : 'text-subtle-foreground')}>
                          {done && <Icon name="check" size={13} strokeWidth={2.2} className="animate-[kitshop-pop_0.4s_var(--ease-kit)] text-primary max-sm:hidden" />}
                          <span className="truncate">{s}</span>
                        </span>
                      </button>
                    </li>
                  );
                })}
              </ol>
              <p className="sr-only" aria-live="polite">
                {t.step} {step + 1} {t.of} 4, {steps[step]}
              </p>
            </nav>

            <form noValidate onSubmit={next} key={step} className={cn(dir === 1 && 'animate-[kitshop-next_0.5s_var(--ease-kit)]', dir === -1 && 'animate-[kitshop-prev_0.5s_var(--ease-kit)]')}>
              <h1 className="mb-6 text-[26px] font-semibold tracking-[-0.025em] text-foreground">{step === 3 ? t.reviewTitle : steps[step]}</h1>
              {step === 0 && (
                <div className="space-y-8">
                  <ContactFields t={t} v={data} e={errors} />
                  <div>
                    <h2 className="mb-4 text-[16px] font-semibold text-foreground">{t.delivery}</h2>
                    <AddressFields t={t} v={data} e={errors} countries={countries} />
                  </div>
                </div>
              )}
              {step === 1 && <ShippingFields t={t} props={props} c={c} />}
              {step === 2 && <PaymentFields t={t} props={props} c={c} />}
              {step === 3 && (
                <div>
                  <dl className="divide-y divide-border rounded-xl border border-border px-4 sm:px-5">
                    {row(t.contact, data.email, 0)}
                    {row(t.delivery, [data.firstName, data.lastName].filter(Boolean).join(' ') + (data.street ? `, ${data.street}, ${data.zip} ${data.city}` : ''), 0)}
                    {row(t.shippingMethod, shipping && `${shipping.label} · ${c.totals.shipping ? fp(c.totals.shipping) : t.free}`, 1)}
                    {row(t.payment, payment?.label, 2)}
                  </dl>
                  <div className="mt-6 lg:hidden">
                    <Summary props={props} totals={c.totals} t={t} />
                  </div>
                </div>
              )}
              <div className="mt-8 flex flex-col-reverse gap-3 sm:flex-row sm:items-center sm:justify-between">
                {step > 0 ? (
                  <Button variant="ghost" iconLeft="arrow-left" onClick={() => setStep(step - 1)}>
                    {t.back}
                  </Button>
                ) : (
                  <span />
                )}
                {step < 3 ? (
                  <Button type="submit" size="lg" icon="arrow-right">
                    {t.continue}
                  </Button>
                ) : (
                  <PlaceOrder t={t} total={c.totals.total} currency={props.currency} className="sm:w-auto" />
                )}
              </div>
              {step === 3 && (
                <div className="mt-4 sm:text-right">
                  <Legal t={t} legal={props.legal} />
                </div>
              )}
            </form>
          </div>

          <aside aria-label={t.summary} className="lg:sticky lg:top-8 lg:self-start">
            <div className="rounded-2xl border border-border bg-surface p-5 sm:p-6">
              <button type="button" aria-expanded={summaryOpen} onClick={() => setSummaryOpen(!summaryOpen)} className="flex w-full items-center justify-between gap-4 text-left lg:pointer-events-none">
                <h2 className="text-[16px] font-semibold text-foreground">{t.summary}</h2>
                <span className="flex items-center gap-2 text-[15px] font-semibold tabular-nums text-foreground lg:hidden">
                  <TweenPrice value={c.totals.total} currency={props.currency} />
                  <Icon name="chevron-down" size={15} className={cn('text-muted-foreground transition-transform', summaryOpen && 'rotate-180')} />
                </span>
              </button>
              <div className={cn('mt-4 lg:block', !summaryOpen && 'max-lg:hidden')}>
                <Summary props={props} totals={c.totals} t={t} compact />
              </div>
            </div>
          </aside>
        </div>
      </div>
    </section>
  );
}

function Express(props: CheckoutProps & { t: T }) {
  const { t } = props;
  const locale = useLocale();
  const c = useCheckout(props);
  const { errors, onSubmit, status } = useSubmit(props, t);
  const [open, setOpen] = useState(false);
  const count = props.items.reduce((a, i) => a + i.quantity, 0);
  return (
    <section className={cn('kit-glow kit-dots pb-20 pt-10 sm:pt-16 lg:pb-28', props.className)}>
      <div className="mx-auto w-full max-w-[28rem] px-6">
        <Head props={props} t={t} className="mb-8" />
        <div className="kit-rise rounded-2xl border border-border bg-card p-5 shadow-[var(--highlight),var(--shadow-lg)] sm:p-7">
          {/* Hover or open: the stacked thumbnails fan out */}
          <button type="button" aria-expanded={open} onClick={() => setOpen(!open)} className="group/stack flex w-full items-center gap-3 rounded-xl bg-surface-2 p-3 text-left transition-colors hover:bg-muted">
            <div className="flex -space-x-3">
              {props.items.slice(0, 3).map((i, n) => (
                <ProductMedia
                  key={i.id}
                  className={cn('size-10 rounded-lg border-2 border-card transition-transform duration-500 ease-[var(--ease-kit)] motion-reduce:transition-none', open ? 'translate-x-[var(--fan)]' : 'group-hover/stack:translate-x-[var(--fan)]')}
                  style={{ '--fan': `${n * 6}px`, zIndex: 3 - n } as React.CSSProperties}
                >
                  {i.image}
                </ProductMedia>
              ))}
            </div>
            <span className="min-w-0 flex-1 text-[13px] text-muted-foreground">
              {count} {locale === 'de' ? 'Artikel' : count === 1 ? 'item' : 'items'}
            </span>
            <TweenPrice value={c.totals.total} currency={props.currency} className="text-[16px] font-semibold text-foreground" />
            <Icon name="chevron-down" size={15} className={cn('text-muted-foreground transition-transform duration-300 motion-reduce:transition-none', open && 'rotate-180')} />
          </button>
          <div className={cn('grid transition-[grid-template-rows] duration-300 motion-reduce:transition-none', open ? 'grid-rows-[1fr]' : 'grid-rows-[0fr]')}>
            <div className="overflow-hidden" inert={!open}>
              <div className="pt-4">
                <Summary props={props} totals={c.totals} t={t} />
              </div>
            </div>
          </div>

          <h1 className="mt-7 text-[22px] font-semibold tracking-[-0.02em] text-foreground">{t.express}</h1>
          <p className="mt-1 text-[14px] text-muted-foreground">{t.expressHint}</p>
          <div className="mt-5 grid gap-2.5">
            {(props.expressOptions ?? []).map((o, n) => (
              <Reveal key={o.label} delay={n * 90} className="grid">
              <button
                type="button"
                className={cn(
                  'group flex h-12 items-center justify-center gap-2.5 rounded-lg text-[15px] font-semibold tracking-[-0.01em] transition-[background-color,transform] active:scale-[0.99]',
                  n === 0 ? 'kit-shine bg-foreground text-background hover:bg-[color-mix(in_oklch,var(--foreground)_88%,var(--background))]' : 'border border-border-strong bg-background text-foreground shadow-[var(--shadow-sm)] hover:bg-accent',
                )}
              >
                <Icon name={o.icon} size={18} />
                {o.label}
              </button>
              </Reveal>
            ))}
          </div>

          <div className="my-7 flex items-center gap-3 text-[12px] text-muted-foreground">
            <span className="h-px flex-1 bg-border" />
            {t.orEmail}
            <span className="h-px flex-1 bg-border" />
          </div>

          <form noValidate onSubmit={onSubmit}>
            <Field label={t.email} name="email" type="email" autoComplete="email" defaultValue={props.values?.email} error={errors.email} hint={t.emailHint} />
            <Button type="submit" size="lg" aria-disabled={status !== 'idle' || undefined} className="mt-4 w-full overflow-hidden">
              <Swap value={status} className="gap-2">
                {t.continuePayment}
                {status === 'idle' ? (
                  <Icon name="arrow-right" size={17} />
                ) : status === 'sending' ? (
                  <span aria-hidden className="size-[17px] animate-kit-spin rounded-full border-2 border-current border-r-transparent [--kit-duration:0.8s] motion-reduce:animate-none" />
                ) : (
                  <Icon name="check" size={17} />
                )}
              </Swap>
            </Button>
          </form>
          <p className="mt-5 text-center text-[13px] text-muted-foreground">
            {t.haveAccount}{' '}
            <a href="#" className="font-medium text-foreground underline decoration-border-strong underline-offset-4">
              {t.signIn}
            </a>
          </p>
        </div>
        <p className="mt-6 flex items-center justify-center gap-1.5 text-[12px] text-muted-foreground">
          <Icon name="shield" size={14} />
          {t.paymentHint}
        </p>
      </div>
    </section>
  );
}

function Confirmation(props: CheckoutProps & { t: T }) {
  const { t, order } = props;
  const c = useCheckout(props);
  // The tracking line fills up to the current step once the card is in view
  const [track, trackIn] = useInView<HTMLDivElement>('0px 0px -15% 0px');
  if (!order) return null;
  const pct = Math.round(((order.done - 0.5) / (order.steps.length - 1)) * 100);
  const share = Math.max(0, Math.min(100, pct)) / 100;
  return (
    <section className={cn('kit-glow pb-20 pt-12 sm:pt-16 lg:pb-28', props.className)}>
      <div className="kit-container">
        <div className="mx-auto max-w-[44rem] text-center">
          <div className="kit-rise relative mx-auto grid size-16 place-items-center">
            <span className="absolute inset-0 animate-ping rounded-full bg-[color-mix(in_oklch,var(--success)_25%,transparent)] [animation-duration:2.4s] [animation-iteration-count:2] motion-reduce:hidden" aria-hidden />
            <span className="relative grid size-16 place-items-center rounded-full bg-success text-background shadow-[var(--shadow-md)]">
              {/* The check draws itself after the circle has risen */}
              <ShopMotion />
              <svg viewBox="0 0 24 24" width={30} height={30} fill="none" stroke="currentColor" strokeWidth={2.4} strokeLinecap="round" strokeLinejoin="round" aria-hidden>
                <path d="m5 12.5 4.5 4.5L19 7.5" strokeDasharray="24" className="animate-[kitshop-draw_0.6s_var(--ease-kit)_0.35s_both] [--kitshop-len:24]" />
              </svg>
            </span>
          </div>
          <h1 className="kit-rise mt-7 text-balance text-h2 font-semibold text-foreground" style={{ '--kit-delay': '80ms' } as React.CSSProperties}>
            {fillText(t.thanks, { name: order.firstName })}
          </h1>
          <p className="kit-rise mx-auto mt-4 max-w-[34rem] text-pretty text-lead text-muted-foreground" style={{ '--kit-delay': '140ms' } as React.CSSProperties}>
            {fill(t.confirmed, { number: <strong className="font-semibold text-foreground">{order.number}</strong> })} {fillText(t.sentTo, { email: order.email })}
          </p>
        </div>

        <Reveal className="mx-auto mt-12 max-w-[56rem]">
          <div className="rounded-2xl border border-border bg-card p-5 shadow-[var(--highlight),var(--shadow-md)] sm:p-8">
            <div className="flex flex-wrap items-baseline justify-between gap-2">
              <p className="text-[13px] text-muted-foreground">{t.arrives}</p>
              <p className="text-[18px] font-semibold tracking-[-0.015em] text-foreground">{order.delivery}</p>
            </div>
            <div ref={track} className="relative mt-6">
              {/* Desktop: across. Phone: down the left edge, from the first dot to the last. */}
              <div className="absolute left-[calc(12.5%)] right-[calc(12.5%)] top-[11px] h-0.5 rounded-full bg-track max-sm:hidden" aria-hidden>
                <div className="h-full origin-left rounded-full bg-success transition-transform duration-[1200ms] ease-[var(--ease-kit)] motion-reduce:transition-none" style={{ transform: `scaleX(${trackIn ? share : 0})` }} />
              </div>
              <div className="absolute bottom-5 left-[11px] top-5 w-0.5 rounded-full bg-track sm:hidden" aria-hidden>
                <div className="h-full origin-top rounded-full bg-success transition-transform duration-[1200ms] ease-[var(--ease-kit)] motion-reduce:transition-none" style={{ transform: `scaleY(${trackIn ? share : 0})` }} />
              </div>
              <ol className="relative grid grid-cols-4 gap-2 max-sm:grid-cols-1 max-sm:gap-0">
                {order.steps.map((s, n) => {
                  const done = n < order.done;
                  const now = n === order.done - 1;
                  // Each dot turns green when the line reaches it
                  const lit = done && trackIn;
                  return (
                    <li key={s.label} className="flex items-center gap-3 text-center sm:flex-col sm:gap-2.5 max-sm:py-2 max-sm:text-left">
                      <span
                        className={cn('relative grid size-6 shrink-0 place-items-center rounded-full border-2 transition-[background-color,border-color,color,transform] duration-300 motion-reduce:transition-none', lit ? 'border-success bg-success text-background' : 'border-border-strong bg-card text-transparent', done && !trackIn && 'scale-90')}
                        style={{ transitionDelay: trackIn ? `${n * 300}ms` : '0ms' }}
                      >
                        {done && <Icon name="check" size={12} strokeWidth={2.8} />}
                        {now && <span className="absolute -inset-1.5 animate-kit-pulse rounded-full border border-success motion-reduce:animate-none" aria-hidden />}
                      </span>
                      <span>
                        <span className={cn('block text-[13px] font-medium', done ? 'text-foreground' : 'text-muted-foreground')}>{s.label}</span>
                        {s.date && <span className="block text-[12px] text-muted-foreground">{s.date}</span>}
                      </span>
                    </li>
                  );
                })}
              </ol>
            </div>
          </div>
        </Reveal>

        <div className="mx-auto mt-6 grid max-w-[56rem] gap-6 lg:grid-cols-[minmax(0,1.3fr)_minmax(0,1fr)]">
          <Reveal delay={60} className="h-full">
            <div className="h-full rounded-2xl border border-border bg-card p-5 shadow-[var(--highlight),var(--shadow-sm)] sm:p-6">
              <h2 className="mb-2 text-[16px] font-semibold text-foreground">{t.yourOrder}</h2>
              <Summary props={props} totals={c.totals} t={t} />
            </div>
          </Reveal>
          <Reveal delay={120} className="h-full">
            <div className="flex h-full flex-col gap-6">
              <dl className="divide-y divide-border rounded-2xl border border-border bg-card px-5 shadow-[var(--highlight),var(--shadow-sm)] sm:px-6">
                {[
                  [t.deliveredTo, order.address.map((a) => <span key={a} className="block">{a}</span>), 'map-pin'],
                  [t.shippedWith, order.shipping, 'truck'],
                  [t.paidWith, order.payment, 'credit-card'],
                ].map(([k, v, icon]) => (
                  <div key={k as string} className="flex gap-3.5 py-4">
                    <Icon name={icon as IconName} size={17} className="-mt-px shrink-0 text-muted-foreground" />
                    <div>
                      <dt className="text-[12px] text-muted-foreground">{k}</dt>
                      <dd className="mt-0.5 text-[14px] text-foreground">{v}</dd>
                    </div>
                  </div>
                ))}
              </dl>
              <div className="flex flex-1 flex-col items-start rounded-2xl border border-dashed border-border-strong p-5">
                <h3 className="text-[14px] font-semibold text-foreground">{t.account}</h3>
                <p className="mt-1 text-pretty text-[13px] text-muted-foreground">{t.accountText}</p>
                <Button variant="outline" size="sm" className="mt-4 h-10" iconLeft="user-plus">
                  {t.createAccount}
                </Button>
              </div>
            </div>
          </Reveal>
        </div>

        <div className="mx-auto mt-10 flex max-w-[56rem] flex-col justify-center gap-3 sm:flex-row">
          <Button href="#" size="lg" iconLeft="truck">
            {t.track}
          </Button>
          <Button href="#" size="lg" variant="outline" icon="arrow-right">
            {t.keepShopping}
          </Button>
        </div>
      </div>
    </section>
  );
}

/**
 * Checkout: everything on one page, two columns with a summary, step by
 * step, express with neutral wallet buttons, and the confirmation after.
 */
export function Checkout(props: CheckoutProps) {
  const t = useTexts(TEXTS, props.labels);
  const { variant = 'two-column' } = props;
  if (variant === 'one-page') return <OnePage {...props} t={t} />;
  if (variant === 'multi-step') return <MultiStep {...props} t={t} />;
  if (variant === 'express') return <Express {...props} t={t} />;
  if (variant === 'confirmation') return <Confirmation {...props} t={t} />;
  return <TwoColumn {...props} t={t} />;
}