084-column dark footer

<main class="stage">
  <footer class="footer is-demo">
    <div class="footer__col footer__col--1">
      <p class="footer__head">Product</p>
      <p class="footer__link">Features</p>
    </div>
    <div class="footer__col footer__col--2">
      <p class="footer__head">Company</p>
      <p class="footer__link">About</p>
    </div>
    <div class="footer__col footer__col--3">
      <p class="footer__head">Resources</p>
      <p class="footer__link">Docs</p>
    </div>
    <div class="footer__col footer__col--4">
      <p class="footer__head">Support</p>
      <p class="footer__link">Contact</p>
    </div>
  </footer>
</main>

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

$duration: $dur-loop;      // 열 하나가 떠오르는 한 주기
$easing: $ease-out;
$color: $subject-blue;

@include stage($stage-paper);

.footer {
  box-sizing: border-box; // width 에 padding 을 포함시켜 320px 에서 넘치지 않게
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: $sp-4;
  width: clamp(240px, 86vw, 360px);
  background: $subject-ink;
  border-radius: $r-card;
  padding: $sp-6;
}
.footer__col {
  display: flex;
  flex-direction: column;
  gap: $sp-2;
  // 데모 루프는 .is-demo 안에서만 — 정적(실사용) 상태는 opacity 1 이라야 글자 대비가 산다
  .footer.is-demo & { animation-name: colRise; }
  animation-duration: $duration;
  animation-timing-function: $easing;
  animation-iteration-count: infinite;
}
.footer__col--1 { animation-delay: 0s; }
.footer__col--2 { animation-delay: $duration * -0.75; }
.footer__col--3 { animation-delay: $duration * -0.5; }
.footer__col--4 { animation-delay: $duration * -0.25; }

.footer__head {
  margin: 0;
  color: $subject-blue-light;   // 먹 면 위 파란 글자 — AA 4.5 (blog-design 글자 대비)
  font: 700 clamp(9px, 2.2vw, 10.5px)/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  text-transform: uppercase;
  letter-spacing: .04em;
}
.footer__link {
  margin: 0;
  color: rgba($subject-cream, .7);
  font-weight: 600; font-size: clamp(10px, 2.4vw, 11.5px); line-height: 1.4;
}

@keyframes colRise {
  0%, 62%, 100% { opacity: .35; transform: translateY(4px); }
  17%           { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  .footer__col { animation: none !important; opacity: 1; transform: 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 {
  box-sizing: border-box;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  width: clamp(240px, 86vw, 360px);
  background: #17141a;
  border-radius: 16px;
  padding: 24px;
}

.footer__col {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer.is-demo .footer__col {
  animation-name: colRise;
}
.footer__col {
  animation-duration: 2s;
  animation-timing-function: ease-out;
  animation-iteration-count: infinite;
}

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

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

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

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

.footer__head {
  margin: 0;
  color: #5b8cf8;
  font: 700 clamp(9px, 2.2vw, 10.5px)/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.footer__link {
  margin: 0;
  color: rgba(255, 247, 230, 0.7);
  font-weight: 600;
  font-size: clamp(10px, 2.4vw, 11.5px);
  line-height: 1.4;
}

@keyframes colRise {
  0%, 62%, 100% {
    opacity: 0.35;
    transform: translateY(4px);
  }
  17% {
    opacity: 1;
    transform: translateY(0);
  }
}
@media (prefers-reduced-motion: reduce) {
  .footer__col {
    animation: none !important;
    opacity: 1;
    transform: none;
  }
}

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

export type FooterLinearProps = {
  columns?: { head: string; link: string }[];
  /** 열 하나가 떠오르는 한 주기(기본 2000ms) */
  duration?: number;
  easing?: string;
  color?: string;
};

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

const DEFAULT_COLUMNS = [
  { head: "제품", link: "기능" },
  { head: "회사", link: "소개" },
  { head: "리소스", link: "문서" },
  { head: "고객지원", link: "문의" },
];

export default function FooterLinear({
  columns = DEFAULT_COLUMNS,
  duration = 2000,
  easing = "ease-out",
  color = "#2f6df6",
}: FooterLinearProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  const delays = columns.map((_, i) => `${-duration * (0.75 - i * 0.25)}ms`);

  return (
    <footer className={styles.footer} style={vars}>
      {columns.map((col, i) => (
        <div key={col.head} className={styles.col} style={{ animationDelay: i === 0 ? "0s" : delays[i] }}>
          <p className={styles.head}>{col.head}</p>
          <p className={styles.link}>{col.link}</p>
        </div>
      ))}
    </footer>
  );
}