06Rising bubbles

<main class="stage">
  <div class="field" aria-hidden="true">
    <span class="p" style="--i:0"></span>
    <span class="p" style="--i:1"></span>
    <span class="p" style="--i:2"></span>
    <span class="p" style="--i:3"></span>
    <span class="p" style="--i:4"></span>
    <span class="p" style="--i:5"></span>
    <span class="p" style="--i:6"></span>
    <span class="p" style="--i:7"></span>
    <span class="p" style="--i:8"></span>
    <span class="p" style="--i:9"></span>
    <span class="p" style="--i:10"></span>
    <span class="p" style="--i:11"></span>
    <span class="p" style="--i:12"></span>
    <span class="p" style="--i:13"></span>
    <span class="p" style="--i:14"></span>
    <span class="p" style="--i:15"></span>
    <span class="p" style="--i:16"></span>
    <span class="p" style="--i:17"></span>
    <span class="p" style="--i:18"></span>
    <span class="p" style="--i:19"></span>
  </div>
  <p class="caption">Cool Down This Summer</p>
</main>

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

// ── 변수 3개 ──────────────────────────────
$duration: $dur-loop * 2;   // 4s 기준
$easing: $ease-out;
$color: $subject-ink;

// ── 데모 무대 ───────────────────────────────
@include stage($stage-yellow);

.field { position: absolute; inset: 0; overflow: hidden; pointer-events: none; }

.caption {
  position: relative; z-index: 1; margin: 0;
  color: $subject-ink; font-weight: 700; font-size: clamp(16px, 5vw, 22px); line-height: 1; font-family: inherit;
}

.p {
  position: absolute;
  bottom: -10%;
  width: 10px; height: 10px;
  border-radius: 50%;
  border: 1.5px solid $color;
  background: rgba($color, .1);
  opacity: 0;
  animation: rise $duration $easing infinite;
  animation-delay: calc(var(--i) * -0.24s);
}

@for $i from 1 through 20 {
  .p:nth-child(#{$i}) {
    left: ((($i * 43) % 92)) * 1%;
    $s: 6px + ($i % 5) * 2px;
    width: $s; height: $s;
    animation-duration: $duration + ($i % 4) * .5s;
  }
}

@keyframes rise {
  0%   { transform: translateY(0) scale(.6); opacity: 0; }
  12%  { opacity: .8; }
  55%  { transform: translateY(-170px) scale(1.15); }
  100% { transform: translateY(-360px) scale(.8); opacity: 0; }
}

// ── 접근성: 상승을 멈추고 제자리 거품만 남긴다 ────────────
@media (prefers-reduced-motion: reduce) {
  .p { animation: none; opacity: .4; bottom: 20%; }
}

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);
}

.field {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.caption {
  position: relative;
  z-index: 1;
  margin: 0;
  color: #17141a;
  font-weight: 700;
  font-size: clamp(16px, 5vw, 22px);
  line-height: 1;
  font-family: inherit;
}

.p {
  position: absolute;
  bottom: -10%;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 1.5px solid #17141a;
  background: rgba(23, 20, 26, 0.1);
  opacity: 0;
  animation: rise 4s ease-out infinite;
  animation-delay: calc(var(--i) * -0.24s);
}

.p:nth-child(1) {
  left: 43%;
  width: 8px;
  height: 8px;
  animation-duration: 4.5s;
}

.p:nth-child(2) {
  left: 86%;
  width: 10px;
  height: 10px;
  animation-duration: 5s;
}

.p:nth-child(3) {
  left: 37%;
  width: 12px;
  height: 12px;
  animation-duration: 5.5s;
}

.p:nth-child(4) {
  left: 80%;
  width: 14px;
  height: 14px;
  animation-duration: 4s;
}

.p:nth-child(5) {
  left: 31%;
  width: 6px;
  height: 6px;
  animation-duration: 4.5s;
}

.p:nth-child(6) {
  left: 74%;
  width: 8px;
  height: 8px;
  animation-duration: 5s;
}

.p:nth-child(7) {
  left: 25%;
  width: 10px;
  height: 10px;
  animation-duration: 5.5s;
}

.p:nth-child(8) {
  left: 68%;
  width: 12px;
  height: 12px;
  animation-duration: 4s;
}

.p:nth-child(9) {
  left: 19%;
  width: 14px;
  height: 14px;
  animation-duration: 4.5s;
}

.p:nth-child(10) {
  left: 62%;
  width: 6px;
  height: 6px;
  animation-duration: 5s;
}

.p:nth-child(11) {
  left: 13%;
  width: 8px;
  height: 8px;
  animation-duration: 5.5s;
}

.p:nth-child(12) {
  left: 56%;
  width: 10px;
  height: 10px;
  animation-duration: 4s;
}

.p:nth-child(13) {
  left: 7%;
  width: 12px;
  height: 12px;
  animation-duration: 4.5s;
}

.p:nth-child(14) {
  left: 50%;
  width: 14px;
  height: 14px;
  animation-duration: 5s;
}

.p:nth-child(15) {
  left: 1%;
  width: 6px;
  height: 6px;
  animation-duration: 5.5s;
}

.p:nth-child(16) {
  left: 44%;
  width: 8px;
  height: 8px;
  animation-duration: 4s;
}

.p:nth-child(17) {
  left: 87%;
  width: 10px;
  height: 10px;
  animation-duration: 4.5s;
}

.p:nth-child(18) {
  left: 38%;
  width: 12px;
  height: 12px;
  animation-duration: 5s;
}

.p:nth-child(19) {
  left: 81%;
  width: 14px;
  height: 14px;
  animation-duration: 5.5s;
}

.p:nth-child(20) {
  left: 32%;
  width: 6px;
  height: 6px;
  animation-duration: 4s;
}

@keyframes rise {
  0% {
    transform: translateY(0) scale(0.6);
    opacity: 0;
  }
  12% {
    opacity: 0.8;
  }
  55% {
    transform: translateY(-170px) scale(1.15);
  }
  100% {
    transform: translateY(-360px) scale(0.8);
    opacity: 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  .p {
    animation: none;
    opacity: 0.4;
    bottom: 20%;
  }
}

import type { CSSProperties } from "react";
import styles from "./BubblesRise.module.scss";

export type BubblesRiseProps = {
  /** 애니메이션 기준 시간(ms) */
  duration?: number;
  /** CSS easing */
  easing?: string;
  /** 피사체 색 */
  color?: string;
};

type Vars = CSSProperties & { "--i"?: number };

const COUNT = 20;

export default function BubblesRise({
  duration = 4000,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#17141a",
}: BubblesRiseProps) {
  const vars = {
    "--duration": `${duration}ms`,
    "--easing": easing,
    "--color": color,
  } as CSSProperties;

  return (
    <div className={styles.field} style={vars} aria-hidden="true">
      {Array.from({ length: COUNT }, (_, i) => (
        <span key={i} className={styles.p} style={{ "--i": i } as Vars} />
      ))}
    </div>
  );
}