07Gradient-border band

<main class="stage">
  <section class="band">
    <div class="band__inner is-demo">
      <h3 class="band__title">Move your team over today</h3>
      <button class="band__cta" type="button">Start for free</button>
    </div>
  </section>
</main>

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

$duration: $dur-loop;      // 테두리 그라디언트가 한 바퀴 도는 시간
$easing: linear;           // 회전은 일정 속도가 자연스럽다 (spring·pop 은 회전에 안 맞는다)
$color: $subject-blue;

@include stage($stage-orange);

.band {
  position: relative;
  width: clamp(240px, 84vw, 360px);
  border-radius: $r-card;
  padding: $sp-1;
  overflow: hidden;
  isolation: isolate;
}
.band::before {
  content: "";
  position: absolute;
  inset: -40%;
  background: conic-gradient(from 0deg, transparent 0%, rgba($color, .95) 18%, transparent 40%);
  animation: bandSpin $duration $easing infinite;
}
.band__inner {
  position: relative;
  z-index: 1;
  border-radius: calc(#{$r-card} - $sp-1);
  background: $subject-ink;
  padding: $sp-8 $sp-6;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: $sp-4;
}
.band__title {
  margin: 0;
  color: $subject-cream;
  font: 700 clamp(15px, 3.8vw, 19px)/1.3 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}
.band__cta {
  border: 0;
  border-radius: $r-pill;
  background: $subject-blue-deep;
  color: $subject-cream;
  padding: $sp-2 $sp-5;
  font-weight: 600; font-size: clamp(11px, 2.8vw, 13px); line-height: 1;
}

@keyframes bandSpin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

@media (prefers-reduced-motion: reduce) {
  .band::before { animation: none !important; }
}

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);
}

.band {
  position: relative;
  width: clamp(240px, 84vw, 360px);
  border-radius: 16px;
  padding: 4px;
  overflow: hidden;
  isolation: isolate;
}

.band::before {
  content: "";
  position: absolute;
  inset: -40%;
  background: conic-gradient(from 0deg, transparent 0%, rgba(47, 109, 246, 0.95) 18%, transparent 40%);
  animation: bandSpin 2s linear infinite;
}

.band__inner {
  position: relative;
  z-index: 1;
  border-radius: calc(16px - 4px);
  background: #17141a;
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
}

.band__title {
  margin: 0;
  color: #fff7e6;
  font: 700 clamp(15px, 3.8vw, 19px)/1.3 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.band__cta {
  border: 0;
  border-radius: 999px;
  background: #0a4fe8;
  color: #fff7e6;
  padding: 8px 20px;
  font-weight: 600;
  font-size: clamp(11px, 2.8vw, 13px);
  line-height: 1;
}

@keyframes bandSpin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}
@media (prefers-reduced-motion: reduce) {
  .band::before {
    animation: none !important;
  }
}

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

export type CtaBandLinearProps = {
  title?: string;
  cta?: string;
  /** 테두리 그라디언트가 한 바퀴 도는 시간(기본 2000ms) */
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function CtaBandLinear({
  title = "Move your team over today",
  cta = "Start for free",
  duration = 2000,
  easing = "linear",
  color = "#2f6df6",
}: CtaBandLinearProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  return (
    <section className={styles.band} style={vars}>
      <div className={styles.inner}>
        <h3 className={styles.title}>{title}</h3>
        <button type="button" className={styles.cta}>{cta}</button>
      </div>
    </section>
  );
}