06Font anatomy cards

<main class="stage">
<div class="fa is-demo is-serif" id="fa">
  <div class="fa__bar" role="group" aria-label="Pick a specimen">
    <button class="fa__pick" type="button" data-face="serif" aria-pressed="true">Serif</button>
    <button class="fa__pick" type="button" data-face="sans" aria-pressed="false">Sans-serif</button>
  </div>
  <div class="fa__cards">
    <figure class="fa__card fa__card--serif">
      <span class="fa__sample" aria-hidden="true">Hxg</span>
      <span class="fa__rule fa__rule--cap"><span class="fa__tag">Cap height</span></span>
      <span class="fa__rule fa__rule--x"><span class="fa__tag">x-height</span></span>
      <span class="fa__rule fa__rule--base"><span class="fa__tag">Baseline</span></span>
      <figcaption class="fa__name">Serif</figcaption>
    </figure>
    <figure class="fa__card fa__card--sans">
      <span class="fa__sample" aria-hidden="true">Hxg</span>
      <span class="fa__rule fa__rule--cap"><span class="fa__tag">Cap height</span></span>
      <span class="fa__rule fa__rule--x"><span class="fa__tag">x-height</span></span>
      <span class="fa__rule fa__rule--base"><span class="fa__tag">Baseline</span></span>
      <figcaption class="fa__name">Sans-serif</figcaption>
    </figure>
  </div>
  <p class="fa__note">The x-height rule is drawn in ex units, so it sits differently in every typeface</p>
</div>
</main>

@use "../../../../site/static/demo-tokens" as *;

// 폰트 해부 카드 — 같은 글자를 세리프와 산세리프로 나란히 놓고 기준선·x 높이·대문자 높이 줄을 겹쳐 그린다.
// 줄은 요소를 더 만들지 않고 `::before` 한 겹에 linear-gradient 로 그린 파선이다.
// x 높이 줄만 진짜 서체 치수다 — `1ex` 는 그 서체의 소문자 x 높이라 카드마다 자리가 다르게 잡힌다.
// 기준선·대문자 높이 줄은 em 비율로 어림한 자리다(대부분의 라틴 서체에서 내림 .21em · 대문자 .70em).
// 미리보기(.is-demo)는 두 카드의 강조를 컷으로 주고받고, 그 사이를 재는 눈금 하나가 위아래로 움직인다.

$duration: $dur-base;
$easing: $ease-spring;
$color: $subject-blue-deep;
$serif: ui-serif, Georgia, "Times New Roman", "Noto Serif KR", serif;
$sans: system-ui, -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
$ink-soft: rgba($subject-ink, .72);
$desc: .21em;
$cap: .70em;

@include stage($stage-yellow);

.fa {
  display: flex; flex-direction: column; gap: $sp-2;
  box-sizing: border-box; width: min(100%, 430px);
  padding: $sp-3; border-radius: $r-card;
  background: $stage-paper;
}

// ── 표본 고르기
.fa__bar { display: flex; gap: $sp-2; }
.fa__pick {
  padding: $sp-1 $sp-2; border: 0; border-radius: $r-pill;
  background: rgba($subject-ink, .10); color: $subject-ink; cursor: pointer;
  font-weight: 700; font-size: 11px; line-height: 1.4;
}
.fa__pick[aria-pressed="true"] { background: $color; color: $subject-cream; }
.fa__pick:focus-visible { outline: 2px solid $subject-ink; outline-offset: 2px; }

// ── 카드 두 장
.fa__cards { display: grid; grid-template-columns: 1fr 1fr; gap: $sp-2; }
.fa__card {
  position: relative; box-sizing: border-box;
  height: 150px; margin: 0; padding: $sp-2;
  border: 1px solid rgba($subject-ink, .14); border-radius: $r-sm;
  background: $stage-paper; overflow: hidden;
}
.fa__card--serif { font-family: $serif; }
.fa__card--sans { font-family: $sans; }

// 글자는 카드 아래쪽에 앉는다. line-height 1 이라 상자 바닥이 곧 내림 끝이다
.fa__sample {
  position: absolute; left: $sp-3; bottom: $sp-4;
  color: $subject-ink; font-weight: 400; font-size: 52px; line-height: 1;
}

// 줄 세 개. 위치는 글자 상자 바닥에서 올라온 거리로 잡는다
.fa__rule {
  position: absolute; left: $sp-2; right: $sp-2;
  font-size: 52px;                     // ex 가 이 크기의 서체 치수로 풀리게 한다
  pointer-events: none;
}
.fa__rule::before {
  content: ""; display: block; height: 1px;
  background: linear-gradient(90deg, $color 0 6px, transparent 6px 10px);
  background-size: 10px 1px;
}
.fa__rule--base { bottom: calc(#{$sp-4} + #{$desc}); }
.fa__rule--x    { bottom: calc(#{$sp-4} + #{$desc} + 1ex); }
.fa__rule--cap  { bottom: calc(#{$sp-4} + #{$desc} + #{$cap}); }
// x 높이 줄만 어림이 아니라 실제 서체 치수(ex)다 — 파선이 아니라 실선 한 줄로 갈라 둔다
.fa__rule--x::before {
  height: 2px;
  background: linear-gradient(90deg, $subject-orange-deep 0 100%);
}

.fa__tag {
  position: absolute; right: 0; bottom: 2px;
  color: $color; font-family: system-ui, sans-serif; font-weight: 700; font-size: 9px; line-height: 1.2;
}
// 줄 셋이 11px 안에 모이는 서체가 있어 라벨은 좌우로 갈라 놓는다
.fa__rule--x .fa__tag { right: auto; left: 0; color: $subject-orange-deep; }
.fa__name {
  position: absolute; left: $sp-2; bottom: $sp-1;
  color: $ink-soft; font-family: system-ui, sans-serif; font-weight: 700; font-size: 10px; line-height: 1.2;
}

// 지금 보고 있는 카드에만 테두리가 선다
.fa.is-serif .fa__card--serif,
.fa.is-sans .fa__card--sans { border-color: $color; background: rgba($subject-blue, .07); }

.fa__note {
  margin: 0; color: $ink-soft;
  font-weight: 500; font-size: 11px; line-height: 1.4;
}

// ── 격자 미리보기 루프 (2초)
// 강조는 steps(1, end) 컷이라 두 카드가 반투명하게 겹치는 프레임이 없다.
// 눈금 하나가 기준선에서 대문자 높이까지 오르내리며 줄 사이의 거리를 가리킨다.
.fa.is-demo .fa__card--serif { animation-name: faHoldA; }
.fa.is-demo .fa__card--sans { animation-name: faHoldB; }
.fa.is-demo .fa__card {
  animation-duration: $dur-loop; animation-timing-function: steps(1, end);
  animation-iteration-count: infinite; animation-fill-mode: both;
}
.fa.is-demo .fa__pick:nth-child(1) { animation-name: faPickA; }
.fa.is-demo .fa__pick:nth-child(2) { animation-name: faPickB; }
.fa.is-demo .fa__pick {
  animation-duration: $dur-loop; animation-timing-function: steps(1, end);
  animation-iteration-count: infinite; animation-fill-mode: both;
}
.fa.is-demo .fa__rule--x {
  animation-name: faSlide; animation-duration: $dur-loop;
  animation-timing-function: $easing; animation-iteration-count: infinite;
  animation-fill-mode: both;
}
.fa.is-demo .fa__sample {
  animation-name: faLift; animation-duration: $dur-loop;
  animation-timing-function: $easing; animation-iteration-count: infinite;
  animation-fill-mode: both;
}

@keyframes faHoldA {
  0% { border-color: $color; background-color: rgba($subject-blue, .07); }
  50%, 100% { border-color: rgba($subject-ink, .14); background-color: $stage-paper; }
}
@keyframes faHoldB {
  0% { border-color: rgba($subject-ink, .14); background-color: $stage-paper; }
  50%, 100% { border-color: $color; background-color: rgba($subject-blue, .07); }
}
@keyframes faPickA {
  0% { background-color: $color; color: $subject-cream; }
  50%, 100% { background-color: rgba($subject-ink, .10); color: $subject-ink; }
}
@keyframes faPickB {
  0% { background-color: rgba($subject-ink, .10); color: $subject-ink; }
  50%, 100% { background-color: $color; color: $subject-cream; }
}
// x 높이 줄이 한 번 짚었다 제자리로 — 두 서체의 x 높이 차이를 눈으로 견주게 한다
@keyframes faSlide {
  0%, 10% { transform: translateY(0); }
  40%, 60% { transform: translateY(-10px); }
  90%, 100% { transform: translateY(0); }
}
@keyframes faLift {
  0%, 10% { transform: translateY(0); }
  40%, 60% { transform: translateY(-4px); }
  90%, 100% { transform: translateY(0); }
}

// ── 좁은 화면: 글자와 카드 높이를 줄여 무대 안에 들어오게 한다
@media (max-width: 340px) {
  .fa { gap: $sp-1; padding: $sp-2; }
  .fa__card { height: 106px; padding: $sp-1; }
  .fa__sample { font-size: 38px; left: $sp-2; bottom: $sp-3; }
  .fa__rule { font-size: 38px; left: $sp-1; right: $sp-1; }
  .fa__rule--base { bottom: calc(#{$sp-3} + #{$desc}); }
  .fa__rule--x    { bottom: calc(#{$sp-3} + #{$desc} + 1ex); }
  .fa__rule--cap  { bottom: calc(#{$sp-3} + #{$desc} + #{$cap}); }
  .fa__pick, .fa__note { font-size: 10px; }
  .fa__tag { font-size: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  .fa.is-demo .fa__card,
  .fa.is-demo .fa__pick,
  .fa.is-demo .fa__rule--x,
  .fa.is-demo .fa__sample {
    animation: none !important;
    transform: none !important;
  }
}

html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffd23f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.fa {
  display: flex;
  flex-direction: column;
  gap: 8px;
  box-sizing: border-box;
  width: min(100%, 430px);
  padding: 12px;
  border-radius: 16px;
  background: #ffffff;
}

.fa__bar {
  display: flex;
  gap: 8px;
}

.fa__pick {
  padding: 4px 8px;
  border: 0;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.1);
  color: #17141a;
  cursor: pointer;
  font-weight: 700;
  font-size: 11px;
  line-height: 1.4;
}

.fa__pick[aria-pressed=true] {
  background: #0a4fe8;
  color: #fff7e6;
}

.fa__pick:focus-visible {
  outline: 2px solid #17141a;
  outline-offset: 2px;
}

.fa__cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.fa__card {
  position: relative;
  box-sizing: border-box;
  height: 150px;
  margin: 0;
  padding: 8px;
  border: 1px solid rgba(23, 20, 26, 0.14);
  border-radius: 8px;
  background: #ffffff;
  overflow: hidden;
}

.fa__card--serif {
  font-family: ui-serif, Georgia, "Times New Roman", "Noto Serif KR", serif;
}

.fa__card--sans {
  font-family: system-ui, -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.fa__sample {
  position: absolute;
  left: 12px;
  bottom: 16px;
  color: #17141a;
  font-weight: 400;
  font-size: 52px;
  line-height: 1;
}

.fa__rule {
  position: absolute;
  left: 8px;
  right: 8px;
  font-size: 52px;
  pointer-events: none;
}

.fa__rule::before {
  content: "";
  display: block;
  height: 1px;
  background: linear-gradient(90deg, #0a4fe8 0 6px, transparent 6px 10px);
  background-size: 10px 1px;
}

.fa__rule--base {
  bottom: calc(16px + 0.21em);
}

.fa__rule--x {
  bottom: calc(16px + 0.21em + 1ex);
}

.fa__rule--cap {
  bottom: calc(16px + 0.21em + 0.7em);
}

.fa__rule--x::before {
  height: 2px;
  background: linear-gradient(90deg, #c93000 0 100%);
}

.fa__tag {
  position: absolute;
  right: 0;
  bottom: 2px;
  color: #0a4fe8;
  font-family: system-ui, sans-serif;
  font-weight: 700;
  font-size: 9px;
  line-height: 1.2;
}

.fa__rule--x .fa__tag {
  right: auto;
  left: 0;
  color: #c93000;
}

.fa__name {
  position: absolute;
  left: 8px;
  bottom: 4px;
  color: rgba(23, 20, 26, 0.72);
  font-family: system-ui, sans-serif;
  font-weight: 700;
  font-size: 10px;
  line-height: 1.2;
}

.fa.is-serif .fa__card--serif,
.fa.is-sans .fa__card--sans {
  border-color: #0a4fe8;
  background: rgba(47, 109, 246, 0.07);
}

.fa__note {
  margin: 0;
  color: rgba(23, 20, 26, 0.72);
  font-weight: 500;
  font-size: 11px;
  line-height: 1.4;
}

.fa.is-demo .fa__card--serif {
  animation-name: faHoldA;
}

.fa.is-demo .fa__card--sans {
  animation-name: faHoldB;
}

.fa.is-demo .fa__card {
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
  animation-fill-mode: both;
}

.fa.is-demo .fa__pick:nth-child(1) {
  animation-name: faPickA;
}

.fa.is-demo .fa__pick:nth-child(2) {
  animation-name: faPickB;
}

.fa.is-demo .fa__pick {
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
  animation-fill-mode: both;
}

.fa.is-demo .fa__rule--x {
  animation-name: faSlide;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
  animation-fill-mode: both;
}

.fa.is-demo .fa__sample {
  animation-name: faLift;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
  animation-fill-mode: both;
}

@keyframes faHoldA {
  0% {
    border-color: #0a4fe8;
    background-color: rgba(47, 109, 246, 0.07);
  }
  50%, 100% {
    border-color: rgba(23, 20, 26, 0.14);
    background-color: #ffffff;
  }
}
@keyframes faHoldB {
  0% {
    border-color: rgba(23, 20, 26, 0.14);
    background-color: #ffffff;
  }
  50%, 100% {
    border-color: #0a4fe8;
    background-color: rgba(47, 109, 246, 0.07);
  }
}
@keyframes faPickA {
  0% {
    background-color: #0a4fe8;
    color: #fff7e6;
  }
  50%, 100% {
    background-color: rgba(23, 20, 26, 0.1);
    color: #17141a;
  }
}
@keyframes faPickB {
  0% {
    background-color: rgba(23, 20, 26, 0.1);
    color: #17141a;
  }
  50%, 100% {
    background-color: #0a4fe8;
    color: #fff7e6;
  }
}
@keyframes faSlide {
  0%, 10% {
    transform: translateY(0);
  }
  40%, 60% {
    transform: translateY(-10px);
  }
  90%, 100% {
    transform: translateY(0);
  }
}
@keyframes faLift {
  0%, 10% {
    transform: translateY(0);
  }
  40%, 60% {
    transform: translateY(-4px);
  }
  90%, 100% {
    transform: translateY(0);
  }
}
@media (max-width: 340px) {
  .fa {
    gap: 4px;
    padding: 8px;
  }
  .fa__card {
    height: 106px;
    padding: 4px;
  }
  .fa__sample {
    font-size: 38px;
    left: 8px;
    bottom: 12px;
  }
  .fa__rule {
    font-size: 38px;
    left: 4px;
    right: 4px;
  }
  .fa__rule--base {
    bottom: calc(12px + 0.21em);
  }
  .fa__rule--x {
    bottom: calc(12px + 0.21em + 1ex);
  }
  .fa__rule--cap {
    bottom: calc(12px + 0.21em + 0.7em);
  }
  .fa__pick, .fa__note {
    font-size: 10px;
  }
  .fa__tag {
    font-size: 8px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .fa.is-demo .fa__card,
  .fa.is-demo .fa__pick,
  .fa.is-demo .fa__rule--x,
  .fa.is-demo .fa__sample {
    animation: none !important;
    transform: none !important;
  }
}

var fa = document.getElementById('fa');
var picks = fa.querySelectorAll('.fa__pick');
// 실사용 경로 — 고른 표본 카드만 앞으로 나온다. 미리보기 루프는 같은 전환을 CSS 컷으로 돈다
picks.forEach(function (b) {
  b.addEventListener('click', function () {
    fa.classList.remove('is-demo');
    var face = b.getAttribute('data-face');
    fa.classList.toggle('is-serif', face === 'serif');
    fa.classList.toggle('is-sans', face === 'sans');
    picks.forEach(function (x) {
      x.setAttribute('aria-pressed', x.getAttribute('data-face') === face ? 'true' : 'false');
    });
  });
});

// FontAnatomyCards — vanilla 판(run/074/demo/06-font-anatomy-cards/index.html) 의 React 포트.
// 세리프와 산세리프 카드에 기준선·x 높이·대문자 높이 줄을 겹쳐 그린다.
// x 높이 줄만 1ex 로 그 실제 서체 치수에서 나온다 — 카드마다 자리가 달라진다.
import { useState } from "react";
import type { FC } from "react";
import styles from "./FontAnatomyCards.module.scss";

export type FontAnatomyCardsProps = {
  duration?: number;
  easing?: string;
  color?: string;
};

type Face = "serif" | "sans";
const FACES: Face[] = ["serif", "sans"];
const FACE_LABEL: Record<Face, string> = { serif: "세리프", sans: "산세리프" };
const NOTE = "x 높이 줄은 ex 단위로 그려 서체마다 자리가 달라집니다";
const TAGS = ["대문자 높이", "x 높이", "기준선"] as const;

const RULE_CLASS: Record<(typeof TAGS)[number], string> = {
  "대문자 높이": "fa__rule--cap",
  "x 높이": "fa__rule--x",
  "기준선": "fa__rule--base",
};

const Card: FC<{ face: Face }> = ({ face }) => (
  <figure className={styles["fa__card--" + face]}>
    <span className={styles.fa__sample} aria-hidden="true">Hxg</span>
    {TAGS.map((t) => (
      <span key={t} className={[styles.fa__rule, styles[RULE_CLASS[t]]].join(" ")}>
        <span className={styles.fa__tag}>{t}</span>
      </span>
    ))}
    <figcaption className={styles.fa__name}>{FACE_LABEL[face]}</figcaption>
  </figure>
);

const FontAnatomyCards: FC<FontAnatomyCardsProps> = ({ duration, easing, color }) => {
  const [face, setFace] = useState<Face>("serif");
  const [demo, setDemo] = useState(true);

  const cls = [styles.fa, demo ? styles["is-demo"] : "", styles["is-" + face]]
    .filter(Boolean).join(" ");
  const vars = {
    "--duration": duration != null ? duration + "ms" : undefined,
    "--easing": easing,
    "--color": color,
  } as never;

  return (
    <div className={cls} style={vars}>
      <div className={styles.fa__bar} role="group" aria-label="표본 고르기">
        {FACES.map((f) => (
          <button
            key={f}
            type="button"
            className={styles.fa__pick}
            aria-pressed={face === f ? "true" : "false"}
            onClick={() => {
              setDemo(false);
              setFace(f);
            }}
          >
            {FACE_LABEL[f]}
          </button>
        ))}
      </div>
      <div className={styles.fa__cards}>
        <Card face="serif" />
        <Card face="sans" />
      </div>
      <p className={styles.fa__note}>{NOTE}</p>
    </div>
  );
};

export default FontAnatomyCards;