04Crow walking across a wordmark

<main class="stage">
<div class="cr is-demo" id="crRoot">
  <div class="cr__scene">
    <span class="cr__wordghost" aria-hidden="true">CROW</span>
    <span class="cr__word">CROW</span>
    <span class="cr__feather cr__feather--a"></span>
    <span class="cr__feather cr__feather--b"></span>
    <span class="cr__feather cr__feather--c"></span>
    <span class="cr__drop"><span class="cr__dropleaf"></span></span>
    <button class="cr__crow" id="crCrow" type="button" aria-label="CROW">
      <span class="cr__body"></span>
      <span class="cr__tail"></span>
      <span class="cr__beak"></span>
      <span class="cr__eye"></span>
      <span class="cr__leg cr__leg--l"></span>
      <span class="cr__leg cr__leg--r"></span>
    </button>
  </div>
  <p class="cr__hint">Click the crow</p>
</div>
</main>

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

// 까마귀가 지나가는 워드마크 — 글자에 그라디언트를 입히고(background-clip: text)
// 까마귀 실루엣을 그 위에서 걷게 한다. 걸음은 translateX 횡단 + 다리 회전,
// 깃털 세 장은 animation-delay 로 시차를 둔다. 누르면 깃털이 한 장 떨어진다.

$duration: $dur-loop;
$easing: $ease-out;
$color: $subject-ink;

$grad-a: $subject-pink;
$grad-b: $stage-orange;
$grad-c: $subject-blue;

@include stage($stage-paper);

.cr {
  display: flex; flex-direction: column; align-items: center; gap: $sp-2;
  width: min(100%, 320px);
}

.cr__scene {
  position: relative; box-sizing: border-box;
  width: 100%; height: 156px; overflow: hidden;
  border-radius: $r-card;
}

// 워드마크: 그라디언트 글자(본체)와 그 아래 고스트 그림자(text-shadow, 읽는 글자가 아니다)
.cr__word {
  position: absolute; left: 50%; top: 40px; transform: translateX(-50%);
  font-weight: 900; font-size: 76px; line-height: 1; letter-spacing: 2px;
  background: linear-gradient(92deg, $grad-a 0%, $grad-b 48%, $grad-c 100%);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
  text-shadow: none;
}
.cr__wordghost {
  position: absolute; left: 50%; top: 44px; transform: translateX(-50%);
  font-weight: 900; font-size: 76px; line-height: 1; letter-spacing: 2px;
  color: transparent;
  text-shadow: 0 5px 0 rgba(23, 20, 26, .1);
}

// 깃털 세 장: 왼쪽에서 떠다닌다
.cr__feather {
  position: absolute; width: 16px; height: 7px;
  border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
  background: $subject-ink;
  animation-name: crFloat; animation-duration: $duration;
  animation-timing-function: ease-in-out; animation-iteration-count: infinite;
  animation-direction: alternate; animation-fill-mode: both;
}
.cr__feather--a { left: 8%; top: 22%; animation-delay: 0ms; }
.cr__feather--b { left: 16%; top: 64%; animation-delay: 300ms; background: $grad-a; }
.cr__feather--c { left: 4%; top: 46%; animation-delay: 600ms; background: $grad-c; }

// 눌렀을 때 떨어지는 깃털 한 장
.cr__drop {
  position: absolute; left: 50%; top: 108px; width: 16px; height: 7px;
  margin-left: -8px; opacity: 0;
}
.cr__dropleaf {
  display: block; width: 16px; height: 7px;
  border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
  background: $subject-ink;
}
.cr__drop {
  transition: transform 900ms $ease-pop, opacity 200ms linear;
}
.cr.is-drop .cr__drop {
  opacity: 1; transform: translateY(34px) rotate(140deg);
}

// ── 까마귀: 버튼(키보드·터치 가능). 글자 위층에서 성큼성큼 가로지른다
.cr__crow {
  position: absolute; top: 76px; left: -80px;
  width: 76px; height: 46px; padding: 0; border: 0; background: none;
  cursor: pointer;
  animation-name: crWalk; animation-duration: $duration;
  animation-timing-function: linear; animation-iteration-count: infinite;
}
.cr__body {
  position: absolute; left: 12px; top: 6px; width: 38px; height: 22px;
  border-radius: 50% 50% 44% 44%;
  background: $color;
}
.cr__tail {
  position: absolute; left: 0; top: 12px; width: 16px; height: 10px;
  clip-path: polygon(100% 0, 100% 100%, 0 34%);
  background: $color;
}
.cr__beak {
  position: absolute; right: 4px; top: 12px; width: 14px; height: 9px;
  clip-path: polygon(100% 50%, 0 0, 0 100%);
  background: $color;
}
.cr__eye {
  position: absolute; right: 14px; top: 13px; width: 4px; height: 4px;
  border-radius: 50%; background: $stage-paper;
}
.cr__leg {
  position: absolute; top: 26px; width: 3px; height: 14px;
  border-radius: $r-pill; background: $color;
  transform-origin: top center;
  animation-name: crStep; animation-duration: 250ms;
  animation-timing-function: linear; animation-iteration-count: infinite;
}
.cr__leg--l { left: 24px; }
.cr__leg--r { right: 24px; animation-delay: 125ms; }

.cr__hint {
  margin: 0; font-size: 11px; line-height: 1.4;
  color: rgba(23, 20, 26, .72);
}

@keyframes crWalk {
  from { transform: translateX(0); }
  to { transform: translateX(400px); }
}
@keyframes crStep {
  0%, 100% { transform: rotate(-14deg); }
  50% { transform: rotate(14deg); }
}
@keyframes crFloat {
  from { transform: translateY(-6px) rotate(-8deg); }
  to { transform: translateY(6px) rotate(8deg); }
}

// 사람이 누른 상태: 걸음과 다리만 멈춘다(까마귀가 서서 깃털이 떨어지는 걸 본다)
.cr:not(.is-demo) .cr__crow,
.cr:not(.is-demo) .cr__leg { animation-name: none; }

@media (max-width: 340px) {
  .cr__scene { height: 126px; }
  .cr__word, .cr__wordshadow { font-size: 58px; top: 34px; }
  .cr__crow { top: 62px; }
  .cr__hint { font-size: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  .cr__crow, .cr__leg, .cr__feather { animation-name: none !important; }
  .cr__drop { transition: none !important; }
}

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

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

.cr {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  width: min(100%, 320px);
}

.cr__scene {
  position: relative;
  box-sizing: border-box;
  width: 100%;
  height: 156px;
  overflow: hidden;
  border-radius: 16px;
}

.cr__word {
  position: absolute;
  left: 50%;
  top: 40px;
  transform: translateX(-50%);
  font-weight: 900;
  font-size: 76px;
  line-height: 1;
  letter-spacing: 2px;
  background: linear-gradient(92deg, #ff9ebb 0%, #ff4d1f 48%, #2f6df6 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: none;
}

.cr__wordghost {
  position: absolute;
  left: 50%;
  top: 44px;
  transform: translateX(-50%);
  font-weight: 900;
  font-size: 76px;
  line-height: 1;
  letter-spacing: 2px;
  color: transparent;
  text-shadow: 0 5px 0 rgba(23, 20, 26, 0.1);
}

.cr__feather {
  position: absolute;
  width: 16px;
  height: 7px;
  border-radius: 50% 50% 50% 50%/60% 60% 40% 40%;
  background: #17141a;
  animation-name: crFloat;
  animation-duration: 2s;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
  animation-direction: alternate;
  animation-fill-mode: both;
}

.cr__feather--a {
  left: 8%;
  top: 22%;
  animation-delay: 0ms;
}

.cr__feather--b {
  left: 16%;
  top: 64%;
  animation-delay: 300ms;
  background: #ff9ebb;
}

.cr__feather--c {
  left: 4%;
  top: 46%;
  animation-delay: 600ms;
  background: #2f6df6;
}

.cr__drop {
  position: absolute;
  left: 50%;
  top: 108px;
  width: 16px;
  height: 7px;
  margin-left: -8px;
  opacity: 0;
}

.cr__dropleaf {
  display: block;
  width: 16px;
  height: 7px;
  border-radius: 50% 50% 50% 50%/60% 60% 40% 40%;
  background: #17141a;
}

.cr__drop {
  transition: transform 900ms cubic-bezier(0.2, 1.4, 0.4, 1), opacity 200ms linear;
}

.cr.is-drop .cr__drop {
  opacity: 1;
  transform: translateY(34px) rotate(140deg);
}

.cr__crow {
  position: absolute;
  top: 76px;
  left: -80px;
  width: 76px;
  height: 46px;
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
  animation-name: crWalk;
  animation-duration: 2s;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}

.cr__body {
  position: absolute;
  left: 12px;
  top: 6px;
  width: 38px;
  height: 22px;
  border-radius: 50% 50% 44% 44%;
  background: #17141a;
}

.cr__tail {
  position: absolute;
  left: 0;
  top: 12px;
  width: 16px;
  height: 10px;
  clip-path: polygon(100% 0, 100% 100%, 0 34%);
  background: #17141a;
}

.cr__beak {
  position: absolute;
  right: 4px;
  top: 12px;
  width: 14px;
  height: 9px;
  clip-path: polygon(100% 50%, 0 0, 0 100%);
  background: #17141a;
}

.cr__eye {
  position: absolute;
  right: 14px;
  top: 13px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: #ffffff;
}

.cr__leg {
  position: absolute;
  top: 26px;
  width: 3px;
  height: 14px;
  border-radius: 999px;
  background: #17141a;
  transform-origin: top center;
  animation-name: crStep;
  animation-duration: 250ms;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}

.cr__leg--l {
  left: 24px;
}

.cr__leg--r {
  right: 24px;
  animation-delay: 125ms;
}

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

@keyframes crWalk {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(400px);
  }
}
@keyframes crStep {
  0%, 100% {
    transform: rotate(-14deg);
  }
  50% {
    transform: rotate(14deg);
  }
}
@keyframes crFloat {
  from {
    transform: translateY(-6px) rotate(-8deg);
  }
  to {
    transform: translateY(6px) rotate(8deg);
  }
}
.cr:not(.is-demo) .cr__crow,
.cr:not(.is-demo) .cr__leg {
  animation-name: none;
}

@media (max-width: 340px) {
  .cr__scene {
    height: 126px;
  }
  .cr__word, .cr__wordshadow {
    font-size: 58px;
    top: 34px;
  }
  .cr__crow {
    top: 62px;
  }
  .cr__hint {
    font-size: 10px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .cr__crow, .cr__leg, .cr__feather {
    animation-name: none !important;
  }
  .cr__drop {
    transition: none !important;
  }
}

// 까마귀를 누르면 깃털이 한 장 떨어진다(.is-drop).
// 손이 닿는 순간 미리보기 루프(.is-demo)를 떼고 걸음을 멈춘 채 결과를 보여준다.
(function () {
  var root = document.getElementById('crRoot');
  var crow = document.getElementById('crCrow');
  crow.addEventListener('click', function () {
    root.classList.remove('is-demo');
    root.classList.remove('is-drop');
    // 같은 프레임에 지웠다 붙이면 transition 이 안 걸리므로 틀을 벌린다
    window.requestAnimationFrame(function () {
      root.classList.add('is-drop');
    });
  });
})();

// CrowWordmark — vanilla 판(run/078/demo/04-object-crow-wordmark/index.html) 의 React 포트.
// 까마귀를 누르면 깃털이 한 장 떨어진다(drop). 첫 클릭에 미리보기 루프(is-demo)를 뗀다.
import { useState } from "react";
import type { CSSProperties } from "react";
import styles from "./CrowWordmark.module.scss";

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

type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };

export default function CrowWordmark(props: CrowWordmarkProps) {
  const duration = props.duration ?? 2000;
  const easing = props.easing ?? "ease-out";
  const color = props.color ?? "#17141a";
  const word = props.word ?? "까마귀";
  const [drop, setDrop] = useState<boolean>(false);
  const [preview, setPreview] = useState<boolean>(true);

  const vars: Vars = { "--duration": duration + "ms", "--easing": easing, "--color": color };
  const rootClass = ["cr", preview ? "is-demo" : "", drop ? "is-drop" : ""]
    .filter(Boolean).map((c) => (styles as { [k: string]: string })[c]).join(" ");

  return (
    <main className={styles.stage}>
      <div className={rootClass} style={vars}>
        <div className={styles["cr__scene"]}>
          <span className={styles["cr__wordghost"]} aria-hidden="true">{word}</span>
          <span className={styles["cr__word"]}>{word}</span>
          <span className={styles["cr__feather"] + " " + styles["cr__feather--a"]}></span>
          <span className={styles["cr__feather"] + " " + styles["cr__feather--b"]}></span>
          <span className={styles["cr__feather"] + " " + styles["cr__feather--c"]}></span>
          <span className={styles["cr__drop"]}><span className={styles["cr__dropleaf"]}></span></span>
          <button
            className={styles["cr__crow"]}
            type="button"
            aria-label="까마귀"
            onClick={() => { setPreview(false); setDrop(false); requestAnimationFrame(() => setDrop(true)); }}
          >
            <span className={styles["cr__body"]}></span>
            <span className={styles["cr__tail"]}></span>
            <span className={styles["cr__beak"]}></span>
            <span className={styles["cr__eye"]}></span>
            <span className={styles["cr__leg"] + " " + styles["cr__leg--l"]}></span>
            <span className={styles["cr__leg"] + " " + styles["cr__leg--r"]}></span>
          </button>
        </div>
        <p className={styles["cr__hint"]}>까마귀를 눌러 보세요</p>
      </div>
    </main>
  );
}