05Ngoặc góc

<main class="stage">
  <div class="frame is-demo" tabindex="0">
    <span class="frame__bracket frame__bracket--tl" aria-hidden="true"></span>
    <span class="frame__bracket frame__bracket--tr" aria-hidden="true"></span>
    <span class="frame__bracket frame__bracket--bl" aria-hidden="true"></span>
    <span class="frame__bracket frame__bracket--br" aria-hidden="true"></span>
    <span class="frame__label">Đã chọn</span>
  </div>
</main>

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

$duration: $dur-base;                                   // 실제 호버 시 브래킷이 벌어지는 시간
$easing: $ease-pop;
$color: $subject-cream;                                 // 브래킷 색

@include stage($stage-ink);
.stage { padding: clamp(6px, 2.4vw, 16px); }

.frame {
  position: relative;
  width: min(200px, 64vw);
  aspect-ratio: 4 / 3;
  border-radius: 4px;
  background: linear-gradient(135deg, rgba($color, .16), rgba($color, .04));
  display: grid;
  place-items: center;
  outline: none;
}
.frame__bracket {
  position: absolute;
  width: 22px;
  height: 22px;
  border: 3px solid $color;
  transition: transform $duration $easing;
}
.frame__bracket--tl { top: -3px; left: -3px; border-right: 0; border-bottom: 0; }
.frame__bracket--tr { top: -3px; right: -3px; border-left: 0; border-bottom: 0; }
.frame__bracket--bl { bottom: -3px; left: -3px; border-right: 0; border-top: 0; }
.frame__bracket--br { bottom: -3px; right: -3px; border-left: 0; border-top: 0; }

.frame:hover .frame__bracket--tl, .frame:focus-visible .frame__bracket--tl { transform: translate(-6px, -6px); }
.frame:hover .frame__bracket--tr, .frame:focus-visible .frame__bracket--tr { transform: translate(6px, -6px); }
.frame:hover .frame__bracket--bl, .frame:focus-visible .frame__bracket--bl { transform: translate(-6px, 6px); }
.frame:hover .frame__bracket--br, .frame:focus-visible .frame__bracket--br { transform: translate(6px, 6px); }

// 데모 루프: 2초 안에서 벌어짐 → 유지 → 되돌아옴
.frame.is-demo .frame__bracket--tl { animation: open-tl $dur-loop $easing infinite; }
.frame.is-demo .frame__bracket--tr { animation: open-tr $dur-loop $easing infinite; }
.frame.is-demo .frame__bracket--bl { animation: open-bl $dur-loop $easing infinite; }
.frame.is-demo .frame__bracket--br { animation: open-br $dur-loop $easing infinite; }
@keyframes open-tl { 0%, 15% { transform: translate(0, 0); } 50%, 70% { transform: translate(-6px, -6px); } 100% { transform: translate(0, 0); } }
@keyframes open-tr { 0%, 15% { transform: translate(0, 0); } 50%, 70% { transform: translate(6px, -6px); } 100% { transform: translate(0, 0); } }
@keyframes open-bl { 0%, 15% { transform: translate(0, 0); } 50%, 70% { transform: translate(-6px, 6px); } 100% { transform: translate(0, 0); } }
@keyframes open-br { 0%, 15% { transform: translate(0, 0); } 50%, 70% { transform: translate(6px, 6px); } 100% { transform: translate(0, 0); } }

.frame__label { font-weight: 600; font-size: clamp(11px, 3vw, 12px); line-height: 1; font-family: inherit; color: rgba($color, .8); }

@media (prefers-reduced-motion: reduce) {
  .frame.is-demo .frame__bracket { animation: none; }
}

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);
}

.stage {
  padding: clamp(6px, 2.4vw, 16px);
}

.frame {
  position: relative;
  width: min(200px, 64vw);
  aspect-ratio: 4/3;
  border-radius: 4px;
  background: linear-gradient(135deg, rgba(255, 247, 230, 0.16), rgba(255, 247, 230, 0.04));
  display: grid;
  place-items: center;
  outline: none;
}

.frame__bracket {
  position: absolute;
  width: 22px;
  height: 22px;
  border: 3px solid #fff7e6;
  transition: transform 300ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.frame__bracket--tl {
  top: -3px;
  left: -3px;
  border-right: 0;
  border-bottom: 0;
}

.frame__bracket--tr {
  top: -3px;
  right: -3px;
  border-left: 0;
  border-bottom: 0;
}

.frame__bracket--bl {
  bottom: -3px;
  left: -3px;
  border-right: 0;
  border-top: 0;
}

.frame__bracket--br {
  bottom: -3px;
  right: -3px;
  border-left: 0;
  border-top: 0;
}

.frame:hover .frame__bracket--tl, .frame:focus-visible .frame__bracket--tl {
  transform: translate(-6px, -6px);
}

.frame:hover .frame__bracket--tr, .frame:focus-visible .frame__bracket--tr {
  transform: translate(6px, -6px);
}

.frame:hover .frame__bracket--bl, .frame:focus-visible .frame__bracket--bl {
  transform: translate(-6px, 6px);
}

.frame:hover .frame__bracket--br, .frame:focus-visible .frame__bracket--br {
  transform: translate(6px, 6px);
}

.frame.is-demo .frame__bracket--tl {
  animation: open-tl 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.frame.is-demo .frame__bracket--tr {
  animation: open-tr 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.frame.is-demo .frame__bracket--bl {
  animation: open-bl 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.frame.is-demo .frame__bracket--br {
  animation: open-br 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

@keyframes open-tl {
  0%, 15% {
    transform: translate(0, 0);
  }
  50%, 70% {
    transform: translate(-6px, -6px);
  }
  100% {
    transform: translate(0, 0);
  }
}
@keyframes open-tr {
  0%, 15% {
    transform: translate(0, 0);
  }
  50%, 70% {
    transform: translate(6px, -6px);
  }
  100% {
    transform: translate(0, 0);
  }
}
@keyframes open-bl {
  0%, 15% {
    transform: translate(0, 0);
  }
  50%, 70% {
    transform: translate(-6px, 6px);
  }
  100% {
    transform: translate(0, 0);
  }
}
@keyframes open-br {
  0%, 15% {
    transform: translate(0, 0);
  }
  50%, 70% {
    transform: translate(6px, 6px);
  }
  100% {
    transform: translate(0, 0);
  }
}
.frame__label {
  font-weight: 600;
  font-size: clamp(11px, 3vw, 12px);
  line-height: 1;
  font-family: inherit;
  color: rgba(255, 247, 230, 0.8);
}

@media (prefers-reduced-motion: reduce) {
  .frame.is-demo .frame__bracket {
    animation: none;
  }
}

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

export type CornerBracketsFrameProps = {
  label: string;
  /** 브래킷이 벌어지는 시간 (기본 2000ms, 루프용) */
  duration?: number;
  easing?: string;
  /** 브래킷 색 */
  color?: string;
};

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

export default function CornerBracketsFrame({
  label,
  duration = 2000,
  easing = "cubic-bezier(.2,1.4,.4,1)",
  color = "#fff7e6",
}: CornerBracketsFrameProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  return (
    <div className={styles.frame} style={vars} tabIndex={0}>
      <span className={`${styles.bracket} ${styles.tl}`} aria-hidden="true" />
      <span className={`${styles.bracket} ${styles.tr}`} aria-hidden="true" />
      <span className={`${styles.bracket} ${styles.bl}`} aria-hidden="true" />
      <span className={`${styles.bracket} ${styles.br}`} aria-hidden="true" />
      <span className={styles.label}>{label}</span>
    </div>
  );
}