03Gradient-border cards

<main class="stage">
  <article class="card-a">
    <div class="card-a__body">
      <span class="card-a__icon" aria-hidden="true"></span>
      <h3 class="card-a__title">Real-time sync</h3>
      <p class="card-a__desc">Stays in sync across every device.</p>
    </div>
  </article>
</main>

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

$duration: $dur-loop;
$easing: linear;
$color: $subject-blue;

@include stage($stage-orange);
.stage { padding: clamp(8px, 3vw, 20px); }

// 테두리 자리에만 보이게 잘라낸 링 위에 오로라 3색 줄무늬를 흘려보낸다
.card-a {
  position: relative;
  box-sizing: border-box;
  width: min(240px, 78vw);
  border-radius: $r-card;
  padding: $sp-1;
  isolation: isolate;
}
.card-a::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: $r-card;
  padding: $sp-1;
  background: repeating-linear-gradient(120deg, $color 0 26px, $stage-yellow 26px 52px, $stage-orange 52px 78px, transparent 78px 104px);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  animation: sweep $duration $easing infinite;
}
.card-a__body {
  position: relative;
  overflow: hidden;
  border-radius: calc($r-card - $sp-1);
  background: $stage-ink;
  padding: $sp-5;
  display: flex;
  flex-direction: column;
  gap: $sp-2;
}
.card-a__body::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .3;
  mix-blend-mode: overlay;
  background-image:
    radial-gradient(rgba($stage-paper, .6) .5px, transparent .5px),
    radial-gradient(rgba($stage-ink, .6) .5px, transparent .5px);
  background-size: 3px 3px, 5px 5px;
}
.card-a__icon { position: relative; z-index: 1; width: $sp-8; height: $sp-8; border-radius: $r-sm; background: radial-gradient(circle at 30% 30%, $color, $stage-orange); }
.card-a__title { position: relative; z-index: 1; margin: 0; color: $stage-paper; font: 700 clamp(13px, 3.2vw, 15px)/1.3 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif; }
.card-a__desc { position: relative; z-index: 1; margin: 0; color: rgba($stage-paper, .7); font-weight: 500; font-size: clamp(11px, 2.6vw, 12.5px); line-height: 1.4; }

@keyframes sweep { to { background-position: 208px 0; } }

@media (prefers-reduced-motion: reduce) {
  .card-a::before { animation: 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);
}

.stage {
  padding: clamp(8px, 3vw, 20px);
}

.card-a {
  position: relative;
  box-sizing: border-box;
  width: min(240px, 78vw);
  border-radius: 16px;
  padding: 4px;
  isolation: isolate;
}

.card-a::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 16px;
  padding: 4px;
  background: repeating-linear-gradient(120deg, #2f6df6 0 26px, #ffd23f 26px 52px, #ff4d1f 52px 78px, transparent 78px 104px);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  animation: sweep 2s linear infinite;
}

.card-a__body {
  position: relative;
  overflow: hidden;
  border-radius: 12px;
  background: #17141a;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.card-a__body::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.3;
  mix-blend-mode: overlay;
  background-image: radial-gradient(rgba(255, 255, 255, 0.6) 0.5px, transparent 0.5px), radial-gradient(rgba(23, 20, 26, 0.6) 0.5px, transparent 0.5px);
  background-size: 3px 3px, 5px 5px;
}

.card-a__icon {
  position: relative;
  z-index: 1;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: radial-gradient(circle at 30% 30%, #2f6df6, #ff4d1f);
}

.card-a__title {
  position: relative;
  z-index: 1;
  margin: 0;
  color: #ffffff;
  font: 700 clamp(13px, 3.2vw, 15px)/1.3 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.card-a__desc {
  position: relative;
  z-index: 1;
  margin: 0;
  color: rgba(255, 255, 255, 0.7);
  font-weight: 500;
  font-size: clamp(11px, 2.6vw, 12.5px);
  line-height: 1.4;
}

@keyframes sweep {
  to {
    background-position: 208px 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  .card-a::before {
    animation: none;
  }
}

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

export type AuroraCardProps = {
  title?: string;
  desc?: string;
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function AuroraCard({
  title = "Real-time sync",
  desc = "Stays in sync across every device.",
  duration = 2000,
  easing = "linear",
  color = "#2f6df6",
}: AuroraCardProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  return (
    <article className={styles.card} style={vars}>
      <div className={styles.body}>
        <span className={styles.icon} aria-hidden="true" />
        <h3 className={styles.title}>{title}</h3>
        <p className={styles.desc}>{desc}</p>
      </div>
    </article>
  );
}