05Rotating border

<main class="stage"><button class="btn" type="button"><span class="btn__in">Create with AI</span></button></main>

// ── 변수 3개 ──────────────────────────────────────────
$duration: 3s;                                   // 한 바퀴
$border: 3px;
$colors: #c89a8f, #d2c7a4, #93a4ca, #c89a8f;     // 처음과 끝이 같아야 이음새가 없다

html, body { margin: 0; overflow: hidden; }          // iframe 안에서 스크롤바가 생기지 않게 (실측 2026-09-09: body 여백 8px 이 100vh 를 넘겼다)
.stage { min-height: 100vh; display: grid; place-items: center; margin: 0; background: #d2c7a4; font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif; }

.btn {
  position: relative;
  overflow: hidden;                              // 도는 그라데이션을 버튼 모양으로 자른다
  isolation: isolate;
  border: 0;
  border-radius: 16px;
  padding: $border;                              // 이 두께가 테두리다
  background: transparent;
  cursor: pointer;

  &::before {
    content: "";
    position: absolute;
    inset: -60%;                                 // 회전해도 모서리가 비지 않게 크게
    background: conic-gradient(from 0deg, $colors);
    animation: spin $duration linear infinite;
    z-index: -1;
  }
}

.btn__in {
  display: block;
  border-radius: 13px;
  padding: 20px 52px;
  font-weight: 800;
  font-size: 20px;
  line-height: 1;
  font-family: inherit;
  color: #fff7e6;
  background: #17141a;                           // 안쪽을 덮어서 테두리만 보이게
}

@keyframes spin { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: reduce) {
  .btn::before { animation: none; }              // 정지된 그라데이션 테두리로 남는다
}

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

.stage {
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #d2c7a4;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.btn {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  border: 0;
  border-radius: 16px;
  padding: 3px;
  background: transparent;
  cursor: pointer;
}
.btn::before {
  content: "";
  position: absolute;
  inset: -60%;
  background: conic-gradient(from 0deg, #c89a8f, #d2c7a4, #93a4ca, #c89a8f);
  animation: spin 3s linear infinite;
  z-index: -1;
}

.btn__in {
  display: block;
  border-radius: 13px;
  padding: 20px 52px;
  font-weight: 800;
  font-size: 20px;
  line-height: 1;
  font-family: inherit;
  color: #fff7e6;
  background: #17141a;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}
@media (prefers-reduced-motion: reduce) {
  .btn::before {
    animation: none;
  }
}

import type { CSSProperties, ReactNode } from "react";
import styles from "./GradientBorderButton.module.scss";

export type GradientBorderButtonProps = { children: ReactNode; duration?: number; border?: number; colors?: string[]; onClick?: () => void };

export default function GradientBorderButton({ children, duration = 3000, border = 3, colors = ["#ff4d1f", "#ffd23f", "#2f6df6", "#ff4d1f"], onClick }: GradientBorderButtonProps) {
  const vars = { "--duration": `${duration}ms`, "--border": `${border}px`, "--colors": colors.join(", ") } as CSSProperties;
  return (
    <button type="button" className={styles.btn} style={vars} onClick={onClick}>
      <span className={styles.inner}>{children}</span>
    </button>
  );
}