06Tưng tưng nhảy (pyonpyon)

<main class="stage">
  <div class="hint o-pyon is-demo">
    <span class="hint__arrow" aria-hidden="true">↓</span>
    Xem thêm
  </div>
  <span class="tag">Tưng tưng</span>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: 900ms;
$easing: ease-in-out;
$color: $subject-blue;

// ── 데모 무대 ───────────────────────────────
@include stage($stage-yellow);
.stage { position: relative; }

.hint {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: $sp-2;
  padding: $sp-3 $sp-6;
  border-radius: $r-pill;
  background: $stage-ink;
  color: $subject-cream;
  font-weight: 700;
  font-size: clamp(14px, 4vw, 17px);
  line-height: 1;
  font-family: inherit;
  box-shadow: $shadow-raised;
}
// 바닥 접촉 그림자 — 알약 자체와 별개 레이어. 착지 순간(스쿼시) 넓고 짙게, 정점(공중)엔 좁고 옅게 ──
.hint::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -8px;
  width: 60%;
  height: 8px;
  border-radius: 50%;
  background: rgba($stage-ink, .38);
  filter: blur(2px);
  transform: translateX(-50%) scale(1, 1);
}
.hint__arrow { font-size: 18px; line-height: 1; color: $subject-blue-light; }   // 먹 알약 위 파란 글자 — AA 4.5
.tag {
  position: absolute;
  top: $sp-4;
  right: $sp-4;
  padding: $sp-1 $sp-3;
  border-radius: $r-sm;
  background: rgba(23, 20, 26, .12);
  color: $stage-ink;
  font-weight: 700;
  font-size: 12px;
  line-height: 1;
  font-family: inherit;
  letter-spacing: .04em;
}

// ── 사인파 soft-body + 바닥 그림자 (형태 2차, 사용자 2026-09-14) ─────
// 몸: border-radius 여덟 값(가로4·세로4)을 위상차 π/4 사인파 r_k = 50 + 10·sin(2πt + k·π/4) 로 흔들고,
//      scaleX·scaleY 는 곱이 1 (면적 보존) — 눌리면 옆으로 퍼지고 늘어나면 가늘어진다.
//      keyframes 다섯 지점(0·10·40·70·85%)은 t = pct/100·2π 를 대입한 계산 결과값.
// 그림자: 몸이 -16px 뜬 순간 +16px 내려와 바닥에 붙어 있다(상쇄). 착지 스쿼시 땐 넓고 짙게(무게),
//      공중 정점 땐 좁고 옅게 — 몸이 높을수록 그림자는 퍼져 약해진다는 역수 관계로 계산했다.
.o-pyon {
  animation: o-pyon $duration $easing infinite;
}
.o-pyon::after {
  animation: o-pyon-shadow $duration $easing infinite;
}
@keyframes o-pyon {
  0%, 100% { transform: translateY(0)     scale(1, 1);       border-radius: 50% 57% 60% 57% / 50% 43% 40% 43%; }
  10%      { transform: translateY(2px)   scale(1.11, .9);   border-radius: 56% 60% 58% 52% / 44% 40% 42% 48%; }
  40%      { transform: translateY(-16px) scale(.93, 1.08);  border-radius: 56% 48% 42% 40% / 44% 52% 58% 60%; }
  70%      { transform: translateY(2px)   scale(1.11, .9);   border-radius: 40% 41% 47% 55% / 60% 59% 53% 45%; }
  85%      { transform: translateY(0)     scale(1.02, 1.03); border-radius: 42% 48% 56% 60% / 58% 52% 44% 40%; }
}
@keyframes o-pyon-shadow {
  0%, 100% { transform: translate(-50%, 0)     scale(1, 1);     opacity: .9; }
  10%      { transform: translate(-50%, 0)     scale(1.14, 1.3); opacity: 1; }
  40%      { transform: translate(-50%, 16px)  scale(.6, .75);   opacity: .4; }
  70%      { transform: translate(-50%, 0)     scale(1.14, 1.3); opacity: 1; }
  85%      { transform: translate(-50%, 0)     scale(1.05, 1.1); opacity: .95; }
}

// ── 접근성 ──────────────────────────────────────────
@media (prefers-reduced-motion: reduce) {
  .o-pyon, .o-pyon::after { animation: none; }
}

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);
}

.stage {
  position: relative;
}

.hint {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 999px;
  background: #17141a;
  color: #fff7e6;
  font-weight: 700;
  font-size: clamp(14px, 4vw, 17px);
  line-height: 1;
  font-family: inherit;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}

.hint::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -8px;
  width: 60%;
  height: 8px;
  border-radius: 50%;
  background: rgba(23, 20, 26, 0.38);
  filter: blur(2px);
  transform: translateX(-50%) scale(1, 1);
}

.hint__arrow {
  font-size: 18px;
  line-height: 1;
  color: #5b8cf8;
}

.tag {
  position: absolute;
  top: 16px;
  right: 16px;
  padding: 4px 12px;
  border-radius: 8px;
  background: rgba(23, 20, 26, 0.12);
  color: #17141a;
  font-weight: 700;
  font-size: 12px;
  line-height: 1;
  font-family: inherit;
  letter-spacing: 0.04em;
}

.o-pyon {
  animation: o-pyon 900ms ease-in-out infinite;
}

.o-pyon::after {
  animation: o-pyon-shadow 900ms ease-in-out infinite;
}

@keyframes o-pyon {
  0%, 100% {
    transform: translateY(0) scale(1, 1);
    border-radius: 50% 57% 60% 57%/50% 43% 40% 43%;
  }
  10% {
    transform: translateY(2px) scale(1.11, 0.9);
    border-radius: 56% 60% 58% 52%/44% 40% 42% 48%;
  }
  40% {
    transform: translateY(-16px) scale(0.93, 1.08);
    border-radius: 56% 48% 42% 40%/44% 52% 58% 60%;
  }
  70% {
    transform: translateY(2px) scale(1.11, 0.9);
    border-radius: 40% 41% 47% 55%/60% 59% 53% 45%;
  }
  85% {
    transform: translateY(0) scale(1.02, 1.03);
    border-radius: 42% 48% 56% 60%/58% 52% 44% 40%;
  }
}
@keyframes o-pyon-shadow {
  0%, 100% {
    transform: translate(-50%, 0) scale(1, 1);
    opacity: 0.9;
  }
  10% {
    transform: translate(-50%, 0) scale(1.14, 1.3);
    opacity: 1;
  }
  40% {
    transform: translate(-50%, 16px) scale(0.6, 0.75);
    opacity: 0.4;
  }
  70% {
    transform: translate(-50%, 0) scale(1.14, 1.3);
    opacity: 1;
  }
  85% {
    transform: translate(-50%, 0) scale(1.05, 1.1);
    opacity: 0.95;
  }
}
@media (prefers-reduced-motion: reduce) {
  .o-pyon, .o-pyon::after {
    animation: none;
  }
}

import type { CSSProperties, ReactNode } from "react";
import styles from "./HopHint.module.scss";

export type HopHintProps = {
  children: ReactNode;
  /** 한 번 뛰는 데 걸리는 시간 (기본 900ms) */
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function HopHint({
  children,
  duration = 900,
  easing = "ease-in-out",
  color = "#2f6df6",
}: HopHintProps) {
  const vars: Vars = {
    "--duration": `${duration}ms`,
    "--easing": easing,
    "--color": color,
  };
  return (
    <div className={styles.hint} style={vars}>
      <span className={styles.arrow} aria-hidden="true">
        ↓
      </span>
      {children}
    </div>
  );
}