06Liquid fill circle

<main class="stage">
  <div class="lq-tube is-demo" aria-hidden="true">
    <div class="lq-water"></div>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: 2s;
$easing: $ease-spring;
$color: $subject-sky;

@include stage($stage-yellow);

// 실사용: 로딩 중에만 .is-loading
.lq-tube {
  position: relative;
  width: 150px;
  height: 150px;
  border: 4px solid $subject-ink;
  border-radius: 50%;
  overflow: hidden;   // 원 밖의 물은 잘린다
}

.lq-water {
  position: absolute;
  top: 100%;
  left: calc(50% - 55px);
  width: 110px;
  height: 110px;
  border-radius: 36%;
  background: $color;
}

.lq-tube.is-loading .lq-water,
.lq-tube.is-demo .lq-water {
  // 두 동작의 조합: 사각형의 회전(물결 윗면) + translateY 상승
  animation: lq-wave 2s linear infinite,
             lq-rise $duration $easing infinite;
}

@keyframes lq-wave {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

@keyframes lq-rise {
  0%   { translate: 0 0; }
  50%  { translate: 0 -60px; }
  100% { translate: 0 0; }
}

@media (prefers-reduced-motion: reduce) {
  .lq-tube.is-loading .lq-water,
  .lq-tube.is-demo .lq-water {
    animation: none !important;
    translate: 0 -30px !important;   // 절반쯤 찬 물에 수면이 기울어진 정지 모양
    transform: rotate(12deg) !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);
}

.lq-tube {
  position: relative;
  width: 150px;
  height: 150px;
  border: 4px solid #17141a;
  border-radius: 50%;
  overflow: hidden;
}

.lq-water {
  position: absolute;
  top: 100%;
  left: calc(50% - 55px);
  width: 110px;
  height: 110px;
  border-radius: 36%;
  background: #6ec8ff;
}

.lq-tube.is-loading .lq-water,
.lq-tube.is-demo .lq-water {
  animation: lq-wave 2s linear infinite, lq-rise 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

@keyframes lq-wave {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}
@keyframes lq-rise {
  0% {
    translate: 0 0;
  }
  50% {
    translate: 0 -60px;
  }
  100% {
    translate: 0 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  .lq-tube.is-loading .lq-water,
  .lq-tube.is-demo .lq-water {
    animation: none !important;
    translate: 0 -30px !important;
    transform: rotate(12deg) !important;
  }
}

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

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

export interface LiquidFillProps {
  duration?: string;
  easing?: string;
  color?: string;
  /** 원 테두리 색 */
  frameColor?: string;
}

export default function LiquidFill({
  duration = "2s",
  easing = "cubic-bezier(.2, .8, .2, 1)",
  color = "#6ec8ff",
  frameColor = "#17141a",
}: LiquidFillProps) {
  const style: Vars = {
    "--duration": duration,
    "--easing": easing,
    "--color": color,
    "--frame-color": frameColor,
  } as Vars & { "--frame-color"?: string };
  return (
    <div className={styles.tube} style={style} aria-hidden="true">
      <div className={styles.water} />
    </div>
  );
}