Elevation

import { useId } from 'react';

const OPTIONS = [
  { value: 'flat', label: 'Flat', note: '0 dp, sits on the page' },
  { value: 'raised', label: 'Raised', note: '4 dp, for cards and tiles' },
  { value: 'floating', label: 'Floating', note: '12 dp, for menus and dialogs' },
];

const css = `
  .radio-elevation { display: grid; justify-items: center; gap: 14px; width: 260px; }
  .radio-elevation { --radio-elevation-shadow: light-dark(rgba(0, 0, 0, 0.22), rgba(0, 0, 0, 0.7)); }
  .radio-elevation__stage { position: relative; display: grid; place-items: center; width: 220px; height: 110px; }
  /* The card lifts on a spring; its shadow drops further, spreads, softens and fades as it rises. */
  .radio-elevation__card {
    position: relative;
    box-sizing: border-box;
    width: 124px;
    height: 66px;
    padding: 12px;
    border-radius: 12px;
    background: light-dark(#ebedf0, #232529);
    box-shadow: inset 0 0 0 1px light-dark(#dbdde1, #2e3035), 0 1px 1px var(--radio-elevation-shadow);
    transition: transform 0.55s cubic-bezier(0.3, 1.5, 0.5, 1), box-shadow 0.55s cubic-bezier(0.3, 1.2, 0.5, 1);
  }
  .radio-elevation__line { display: block; height: 5px; margin-bottom: 7px; border-radius: 3px; background: light-dark(#cbced3, #393c41); }
  .radio-elevation__line:first-child { width: 60%; background: light-dark(#5f626a, #a7abb2); }
  .radio-elevation:has(.radio-elevation__opt:nth-child(2) input:checked) .radio-elevation__card {
    transform: translateY(-6px);
    box-shadow: inset 0 0 0 1px light-dark(#dbdde1, #2e3035), 0 2px 3px -1px var(--radio-elevation-shadow), 0 8px 14px -6px var(--radio-elevation-shadow);
  }
  .radio-elevation:has(.radio-elevation__opt:nth-child(3) input:checked) .radio-elevation__card {
    transform: translateY(-16px) scale(1.03);
    box-shadow: inset 0 0 0 1px light-dark(#dbdde1, #2e3035), 0 6px 10px -4px var(--radio-elevation-shadow), 0 26px 30px -14px var(--radio-elevation-shadow);
  }
  .radio-elevation__read { display: grid; color: light-dark(#50535b, #c6c8cd); font-size: 12px; font-variant-numeric: tabular-nums; }
  .radio-elevation__read > * { grid-area: 1 / 1; text-align: center; opacity: 0; transform: translateY(4px); transition: opacity 0.25s, transform 0.3s; }
  .radio-elevation:has(.radio-elevation__opt:nth-child(1) input:checked) .radio-elevation__read > :nth-child(1),
  .radio-elevation:has(.radio-elevation__opt:nth-child(2) input:checked) .radio-elevation__read > :nth-child(2),
  .radio-elevation:has(.radio-elevation__opt:nth-child(3) input:checked) .radio-elevation__read > :nth-child(3) { opacity: 1; transform: none; }
  .radio-elevation__opts { display: flex; gap: 3px; padding: 4px; border-radius: 12px; background: light-dark(#f3f4f7, #1a1c1f); box-shadow: inset 0 0 0 1px light-dark(#dbdde1, #2e3035); }
  .radio-elevation__opt { position: relative; flex: 1; padding: 7px 10px; border-radius: 8px; color: light-dark(#5f626a, #a7abb2); font-size: 12.5px; font-weight: 500; text-align: center; white-space: nowrap; cursor: pointer; transition: background-color 0.25s, color 0.25s; }
  .radio-elevation__opt:hover { color: light-dark(#42454c, #e5e6e9); }
  .radio-elevation__opt:has(input:checked) { background: light-dark(#373a40, #f1f2f3); color: light-dark(#fbfcfd, #121417); }
  .radio-elevation__opt:has(input:focus-visible) { outline: 2px solid light-dark(#50535b, #c6c8cd); outline-offset: 2px; }
  .radio-elevation__input { position: absolute; width: 1px; height: 1px; margin: 0; opacity: 0; pointer-events: none; }
  @media (prefers-reduced-motion: reduce) {
    .radio-elevation * { transition: none !important; }
  }
`;

export function ElevationRadio() {
  const name = useId();
  return (
    <>
      <style>
        {css}
      </style>
      <div className="radio-elevation">
        <div className="radio-elevation__stage" aria-hidden="true">
          <div className="radio-elevation__card">
            <span className="radio-elevation__line" />
            <span className="radio-elevation__line" />
            <span className="radio-elevation__line" style={{ width: '80%' }} />
          </div>
        </div>
        <span className="radio-elevation__read" aria-hidden="true">
          {OPTIONS.map((o) => (
            <span key={o.value}>{o.note}</span>
          ))}
        </span>
        <div className="radio-elevation__opts" role="radiogroup" aria-label="Elevation">
          {OPTIONS.map((o, i) => (
            <label key={o.value} className="radio-elevation__opt">
              <input className="radio-elevation__input" type="radio" name={name} value={o.value} defaultChecked={i === 1} />
              {o.label}
            </label>
          ))}
        </div>
      </div>
    </>
  );
}