09Ghost/primary buttons, dark inputs

<main class="stage">
  <form class="form is-demo">
    <label class="form__field">
      <input class="form__input" type="email" placeholder="Email address" readonly>
    </label>
    <div class="form__row">
      <button class="form__ghost" type="button">Learn more</button>
      <button class="form__primary" type="button">Start for free</button>
    </div>
  </form>
</main>

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

$duration: $dur-loop;      // 글로우·포커스 링이 커졌다 작아지는 한 주기
$easing: $ease-out;
$color: $subject-blue;

@include stage($stage-ink);

.form {
  display: flex;
  flex-direction: column;
  gap: $sp-4;
  width: clamp(210px, 74vw, 280px);
}
.form__field {
  display: block;
  border-radius: $r-control;
  background: rgba($subject-cream, .05);
  border: 1px solid rgba($subject-cream, .12);
}
.form__input {
  width: 100%;
  box-sizing: border-box;
  background: transparent;
  border: 0;
  outline: none;
  padding: $sp-3 $sp-4;
  color: $subject-cream;
  font: 600 clamp(11px, 2.8vw, 13px)/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  border-radius: $r-control;
  animation: inputRing $duration $easing infinite;
}
.form__row {
  display: flex;
  gap: $sp-3;
}
.form__ghost {
  flex: 1 1 0;
  border-radius: $r-control;
  background: transparent;
  border: 1px solid rgba($subject-cream, .2);
  color: $subject-cream;
  padding: $sp-3 $sp-4;
  font-weight: 600; font-size: clamp(10.5px, 2.6vw, 12px); line-height: 1;
}
.form__primary {
  flex: 1 1 0;
  border-radius: $r-control;
  border: 0;
  background: $subject-blue-deep;
  color: $subject-cream;
  padding: $sp-3 $sp-4;
  font-weight: 600; font-size: clamp(10.5px, 2.6vw, 12px); line-height: 1;
  animation: btnGlow $duration $easing infinite;
}

@keyframes inputRing {
  0%, 100% { box-shadow: 0 0 0 0 rgba($color, 0); }
  50%      { box-shadow: 0 0 0 3px rgba($color, .45); }
}
@keyframes btnGlow {
  0%, 100% { box-shadow: 0 0 0 0 rgba($color, 0); }
  50%      { box-shadow: 0 6px 18px rgba($color, .55); }
}

@media (prefers-reduced-motion: reduce) {
  .form__input, .form__primary { animation: none !important; box-shadow: 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);
}

.form {
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: clamp(210px, 74vw, 280px);
}

.form__field {
  display: block;
  border-radius: 12px;
  background: rgba(255, 247, 230, 0.05);
  border: 1px solid rgba(255, 247, 230, 0.12);
}

.form__input {
  width: 100%;
  box-sizing: border-box;
  background: transparent;
  border: 0;
  outline: none;
  padding: 12px 16px;
  color: #fff7e6;
  font: 600 clamp(11px, 2.8vw, 13px)/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  border-radius: 12px;
  animation: inputRing 2s ease-out infinite;
}

.form__row {
  display: flex;
  gap: 12px;
}

.form__ghost {
  flex: 1 1 0;
  border-radius: 12px;
  background: transparent;
  border: 1px solid rgba(255, 247, 230, 0.2);
  color: #fff7e6;
  padding: 12px 16px;
  font-weight: 600;
  font-size: clamp(10.5px, 2.6vw, 12px);
  line-height: 1;
}

.form__primary {
  flex: 1 1 0;
  border-radius: 12px;
  border: 0;
  background: #0a4fe8;
  color: #fff7e6;
  padding: 12px 16px;
  font-weight: 600;
  font-size: clamp(10.5px, 2.6vw, 12px);
  line-height: 1;
  animation: btnGlow 2s ease-out infinite;
}

@keyframes inputRing {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(47, 109, 246, 0);
  }
  50% {
    box-shadow: 0 0 0 3px rgba(47, 109, 246, 0.45);
  }
}
@keyframes btnGlow {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(47, 109, 246, 0);
  }
  50% {
    box-shadow: 0 6px 18px rgba(47, 109, 246, 0.55);
  }
}
@media (prefers-reduced-motion: reduce) {
  .form__input, .form__primary {
    animation: none !important;
    box-shadow: none;
  }
}

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

export type ButtonsInputsLinearProps = {
  placeholder?: string;
  ghostLabel?: string;
  primaryLabel?: string;
  /** 글로우·포커스 링이 커졌다 작아지는 한 주기(기본 2000ms) */
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function ButtonsInputsLinear({
  placeholder = "Email address",
  ghostLabel = "Learn more",
  primaryLabel = "Start for free",
  duration = 2000,
  easing = "ease-out",
  color = "#2f6df6",
}: ButtonsInputsLinearProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  return (
    <form className={styles.form} style={vars}>
      <label className={styles.field}>
        <input className={styles.input} type="email" placeholder={placeholder} readOnly />
      </label>
      <div className={styles.row}>
        <button type="button" className={styles.ghost}>{ghostLabel}</button>
        <button type="button" className={styles.primary}>{primaryLabel}</button>
      </div>
    </form>
  );
}