03Border-highlight cards

<main class="stage">
  <section class="grid is-demo">
    <article class="grid__card grid__card--1">
      <span class="grid__dot" aria-hidden="true"></span>
      <p class="grid__label">Auto deploy</p>
    </article>
    <article class="grid__card grid__card--2">
      <span class="grid__dot" aria-hidden="true"></span>
      <p class="grid__label">Issue tracking</p>
    </article>
    <article class="grid__card grid__card--3">
      <span class="grid__dot" aria-hidden="true"></span>
      <p class="grid__label">Roadmap</p>
    </article>
    <article class="grid__card grid__card--4">
      <span class="grid__dot" aria-hidden="true"></span>
      <p class="grid__label">API integrations</p>
    </article>
  </section>
</main>

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

$duration: $dur-loop;      // 카드 한 장이 밝아졌다 가라앉는 한 주기
$easing: $ease-out;
$color: $subject-blue;

@include stage($stage-orange);

.grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: $sp-3;
  width: clamp(220px, 76vw, 320px);
}
.grid__card {
  border-radius: $r-card;
  background: $subject-ink;
  border: 1px solid rgba($subject-cream, .08);
  padding: $sp-4;
  display: flex;
  flex-direction: column;
  gap: $sp-4;
  animation-name: cardGlow;
  animation-duration: $duration;
  animation-timing-function: $easing;
  animation-iteration-count: infinite;
}
.grid__card--1 { animation-delay: 0s; }
.grid__card--2 { animation-delay: $duration * -0.75; }
.grid__card--3 { animation-delay: $duration * -0.5; }
.grid__card--4 { animation-delay: $duration * -0.25; }

.grid__dot {
  width: $sp-4;
  height: $sp-4;
  border-radius: $r-xs;
  background: rgba($color, .35);
}
.grid__label {
  margin: 0;
  color: $subject-cream;
  font: 600 clamp(11px, 2.8vw, 13px)/1.3 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

@keyframes cardGlow {
  0%, 76%, 100% { border-color: rgba($subject-cream, .08); box-shadow: none; }
  13%           { border-color: $color; box-shadow: 0 0 0 1px rgba($color, .5), $shadow-raised; }
}

@media (prefers-reduced-motion: reduce) {
  .grid__card { animation: none !important; border-color: rgba($subject-cream, .08); box-shadow: none; }
}

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ff4d1f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  width: clamp(220px, 76vw, 320px);
}

.grid__card {
  border-radius: 16px;
  background: #17141a;
  border: 1px solid rgba(255, 247, 230, 0.08);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  animation-name: cardGlow;
  animation-duration: 2s;
  animation-timing-function: ease-out;
  animation-iteration-count: infinite;
}

.grid__card--1 {
  animation-delay: 0s;
}

.grid__card--2 {
  animation-delay: -1.5s;
}

.grid__card--3 {
  animation-delay: -1s;
}

.grid__card--4 {
  animation-delay: -0.5s;
}

.grid__dot {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  background: rgba(47, 109, 246, 0.35);
}

.grid__label {
  margin: 0;
  color: #fff7e6;
  font: 600 clamp(11px, 2.8vw, 13px)/1.3 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

@keyframes cardGlow {
  0%, 76%, 100% {
    border-color: rgba(255, 247, 230, 0.08);
    box-shadow: none;
  }
  13% {
    border-color: #2f6df6;
    box-shadow: 0 0 0 1px rgba(47, 109, 246, 0.5), 0 14px 24px rgba(23, 20, 26, 0.32);
  }
}
@media (prefers-reduced-motion: reduce) {
  .grid__card {
    animation: none !important;
    border-color: rgba(255, 247, 230, 0.08);
    box-shadow: none;
  }
}

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

export type CardGridLinearProps = {
  labels?: [string, string, string, string];
  /** 카드 한 장이 밝아졌다 가라앉는 한 주기(기본 2000ms) */
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function CardGridLinear({
  labels = ["자동 배포", "이슈 추적", "로드맵", "API 연동"],
  duration = 2000,
  easing = "ease-out",
  color = "#2f6df6",
}: CardGridLinearProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  const delays = ["0s", `${-duration * 0.75}ms`, `${-duration * 0.5}ms`, `${-duration * 0.25}ms`];

  return (
    <section className={styles.grid} style={vars}>
      {labels.map((label, i) => (
        <article key={label} className={styles.card} style={{ animationDelay: delays[i] }}>
          <span className={styles.dot} aria-hidden="true" />
          <p className={styles.label}>{label}</p>
        </article>
      ))}
    </section>
  );
}