08Holographic hairline footer

<main class="stage">
  <footer class="footer-c">
    <div class="footer-c__col">
      <p class="footer-c__label">Product</p>
      <p class="footer-c__link">Pricing</p>
    </div>
    <div class="footer-c__col">
      <p class="footer-c__label">Company</p>
      <p class="footer-c__link">About the team</p>
    </div>
  </footer>
</main>

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

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

@include stage($stage-paper);

.footer-c {
  position: relative;
  box-sizing: border-box;
  width: clamp(260px, 88vw, 400px);
  border-radius: $r-card;
  padding: $sp-6;
  background: $stage-ink;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: $sp-4;
}
// 상단 경계의 홀로그램 실선 — 색이 자리를 옮기며 은은하게 반짝인다 (유일한 애니메이션)
.footer-c::before {
  content: "";
  position: absolute;
  top: 0;
  left: $sp-6;
  right: $sp-6;
  height: 3px;
  border-radius: $r-pill;
  background: linear-gradient(90deg, $color, $stage-yellow, $stage-orange, $subject-cream, $color);
  background-size: 260% 100%;
  animation: hairlineShift $duration $easing infinite;
}
.footer-c__col { position: relative; z-index: 1; border-radius: $r-sm; background: rgba($stage-paper, .05); padding: $sp-3; display: flex; flex-direction: column; gap: $sp-1; }
.footer-c__label {
  margin: 0;
  color: rgba($stage-paper, .5);
  font-weight: 700;
  font-size: clamp(9.5px, 2.2vw, 10.5px);
  line-height: 1;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  text-transform: uppercase;
  letter-spacing: .06em;
}
.footer-c__link {
  margin: 0;
  color: $stage-paper;
  font-weight: 600;
  font-size: clamp(11px, 2.6vw, 12px);
  line-height: 1.4;
  font-family: inherit;
}

@keyframes hairlineShift { 0% { background-position: 0% 50%; } 100% { background-position: 260% 50%; } }

@media (prefers-reduced-motion: reduce) {
  .footer-c::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: #ffffff;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.footer-c {
  position: relative;
  box-sizing: border-box;
  width: clamp(260px, 88vw, 400px);
  border-radius: 16px;
  padding: 24px;
  background: #17141a;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.footer-c::before {
  content: "";
  position: absolute;
  top: 0;
  left: 24px;
  right: 24px;
  height: 3px;
  border-radius: 999px;
  background: linear-gradient(90deg, #2f6df6, #ffd23f, #ff4d1f, #fff7e6, #2f6df6);
  background-size: 260% 100%;
  animation: hairlineShift 2s linear infinite;
}

.footer-c__col {
  position: relative;
  z-index: 1;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.05);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer-c__label {
  margin: 0;
  color: rgba(255, 255, 255, 0.5);
  font-weight: 700;
  font-size: clamp(9.5px, 2.2vw, 10.5px);
  line-height: 1;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.footer-c__link {
  margin: 0;
  color: #ffffff;
  font-weight: 600;
  font-size: clamp(11px, 2.6vw, 12px);
  line-height: 1.4;
  font-family: inherit;
}

@keyframes hairlineShift {
  0% {
    background-position: 0% 50%;
  }
  100% {
    background-position: 260% 50%;
  }
}
@media (prefers-reduced-motion: reduce) {
  .footer-c::before {
    animation: none;
  }
}

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

export type FooterCol = { label: string; link: string };

export type FooterChromeProps = {
  columns?: FooterCol[];
  /** 한 주기(기본 2000ms) */
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function FooterChrome({
  columns = [
    { label: "Product", link: "Pricing" },
    { label: "Company", link: "About" },
  ],
  duration = 2000,
  easing = "linear",
  color = "#2f6df6",
}: FooterChromeProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  return (
    <footer className={styles.footer} style={vars}>
      {columns.map((col) => (
        <div key={col.label} className={styles.col}>
          <p className={styles.label}>{col.label}</p>
          <p className={styles.link}>{col.link}</p>
        </div>
      ))}
    </footer>
  );
}