01縦線の描画

<main class="stage">
  <ul class="ts01-timeline is-demo">
    <li class="ts01-step"><span class="ts01-dot"></span>企画</li>
    <li class="ts01-step"><span class="ts01-dot"></span>デザイン</li>
    <li class="ts01-step"><span class="ts01-dot"></span>開発</li>
    <li class="ts01-step"><span class="ts01-dot"></span>リリース</li>
    <li class="ts01-line" aria-hidden="true"></li>
  </ul>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-enter;
$easing: $ease-out;
$color: $subject-blue;

@include stage($stage-ink);

.ts01-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 32px;
  list-style: none;
  color: $subject-cream;
  font: 500 13px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.ts01-step {
  position: relative;
  padding: $sp-1 0;
  margin-bottom: clamp($sp-4, 6vw, $sp-6);
  &:last-of-type { margin-bottom: 0; }
}

.ts01-dot {
  position: absolute;
  left: -28px;
  top: 3px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: $subject-cream;
  border: 2px solid $stage-ink;
  box-shadow: 0 0 0 2px $color;
}

// 세로선: 위에서 아래로 그려진다 (실제 사용 코드 — 뷰포트 진입 시 한 번)
.ts01-line {
  position: absolute;
  left: -23px;
  top: 4px;
  width: 3px;
  height: calc(100% - 12px);
  background: $color;
  border-radius: $r-xs;
  transform: scaleY(1);
  transform-origin: top; // 규칙8: 세로선 위에서 그려짐

  @supports (animation-timeline: view()) {
    transform: scaleY(0);
    animation: ts01-draw linear both;
    animation-timeline: view();
    animation-range: entry 0% cover 70%;
  }
}

@keyframes ts01-draw {
  from { transform: scaleY(0); }
  to   { transform: scaleY(1); }
}

// 데모 루프: 뷰포트 진입을 2초 주기로 흉내
.ts01-timeline.is-demo .ts01-line {
  animation: ts01-draw-loop $duration $easing infinite;
}
@keyframes ts01-draw-loop {
  0%, 8%   { transform: scaleY(0); }
  75%, 100% { transform: scaleY(1); }
}

@media (prefers-reduced-motion: reduce) {
  .ts01-line, .ts01-timeline.is-demo .ts01-line { animation: none !important; transform: scaleY(1) !important; }
}

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.ts01-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 32px;
  list-style: none;
  color: #fff7e6;
  font: 500 13px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.ts01-step {
  position: relative;
  padding: 4px 0;
  margin-bottom: clamp(16px, 6vw, 24px);
}
.ts01-step:last-of-type {
  margin-bottom: 0;
}

.ts01-dot {
  position: absolute;
  left: -28px;
  top: 3px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #fff7e6;
  border: 2px solid #17141a;
  box-shadow: 0 0 0 2px #2f6df6;
}

.ts01-line {
  position: absolute;
  left: -23px;
  top: 4px;
  width: 3px;
  height: calc(100% - 12px);
  background: #2f6df6;
  border-radius: 4px;
  transform: scaleY(1);
  transform-origin: top;
}
@supports (animation-timeline: view()) {
  .ts01-line {
    transform: scaleY(0);
    animation: ts01-draw linear both;
    animation-timeline: view();
    animation-range: entry 0% cover 70%;
  }
}

@keyframes ts01-draw {
  from {
    transform: scaleY(0);
  }
  to {
    transform: scaleY(1);
  }
}
.ts01-timeline.is-demo .ts01-line {
  animation: ts01-draw-loop 600ms ease-out infinite;
}

@keyframes ts01-draw-loop {
  0%, 8% {
    transform: scaleY(0);
  }
  75%, 100% {
    transform: scaleY(1);
  }
}
@media (prefers-reduced-motion: reduce) {
  .ts01-line, .ts01-timeline.is-demo .ts01-line {
    animation: none !important;
    transform: scaleY(1) !important;
  }
}

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

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

export interface VerticalLineDrawProps {
  duration?: string;
  easing?: string;
  color?: string;
  steps?: string[];
}

export default function VerticalLineDraw({
  duration = "600ms",
  easing = "ease-out",
  color = "#2f6df6",
  steps = ["기획", "디자인", "개발", "출시"],
}: VerticalLineDrawProps) {
  const style: Vars = {
    "--duration": duration,
    "--easing": easing,
    "--color": color,
  };
  return (
    <ul className={styles.timeline} style={style}>
      {steps.map((s) => (
        <li key={s} className={styles.step}>
          <span className={styles.dot} />
          {s}
        </li>
      ))}
      <li className={styles.line} aria-hidden="true" />
    </ul>
  );
}