07Settings form section with save state

<main class="stage">
  <form class="sf" novalidate>
    <h2 class="sf__title">Notifications</h2>
    <label class="sf__row">
      <span>Email alerts</span>
      <span class="sf__switch is-demo" role="switch" aria-checked="true" tabindex="0"><span class="sf__knob" aria-hidden="true"></span></span>
    </label>
    <label class="sf__row">
      <span>Weekly report</span>
      <span class="sf__switch" role="switch" aria-checked="false" tabindex="0"><span class="sf__knob" aria-hidden="true"></span></span>
    </label>
    <button class="sf__save" type="submit">
      <span class="sf__save-label">Save</span>
    </button>
  </form>
</main>

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

$duration: $dur-base;
$easing: $ease-spring;
$color: $subject-blue;

@include stage($stage-paper);

.sf {
  box-sizing: border-box;
  width: min(300px, 88vw);
  border-radius: $r-card;
  padding: $sp-4;
  background: #fff;
  box-shadow: $shadow-raised;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}
.sf__title { margin: 0 0 $sp-3; font-size: 13px; font-weight: 800; color: $stage-ink; }
.sf__row {
  display: flex; align-items: center; justify-content: space-between;
  padding: $sp-2 0;
  font-size: 12px; font-weight: 600; color: rgba(23, 20, 26, .72);
  border-bottom: 1px solid rgba(23, 20, 26, .06);
}
.sf__switch {
  position: relative;
  width: 38px; height: 22px;
  border-radius: $r-pill;
  background: rgba(23, 20, 26, .15);
  cursor: pointer;
  transition: background $duration $easing;
  flex: 0 0 auto;
}
.sf__switch[aria-checked="true"] { background: $color; }
.sf__knob {
  position: absolute; top: 2px; left: 2px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(23, 20, 26, .3);
  transition: transform $duration $easing;
}
.sf__switch[aria-checked="true"] .sf__knob { transform: translateX(16px); }

.sf__save {
  margin-top: $sp-4;
  width: 100%;
  border: 0; border-radius: $r-control;
  padding: $sp-2 $sp-4;
  background: $stage-ink;
  color: $subject-cream;
  font: inherit; font-weight: 700; font-size: 12px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center; gap: $sp-2;
}
.sf__save::before {
  content: "";
  width: 12px; height: 12px;
  border-radius: 50%;
  border: 2px solid transparent;
  display: none;
}
.sf__save.is-busy::before { display: block; border-color: rgba(255, 247, 230, .3); border-top-color: $subject-cream; animation: sf-spin .6s linear infinite; }
.sf__save.is-done { background: #47905f; }
@keyframes sf-spin { to { transform: rotate(360deg); } }

// ── 자동 루프: 스위치 노브에 은은한 링 글로우가 반복된다 ──────────────
.sf__switch.is-demo .sf__knob { animation: sf-glow 2s ease-in-out infinite; }
@keyframes sf-glow {
  0%, 100% { box-shadow: 0 1px 3px rgba(23, 20, 26, .3), 0 0 0 0 rgba(47, 109, 246, 0); }
  50%      { box-shadow: 0 1px 3px rgba(23, 20, 26, .3), 0 0 0 6px rgba(47, 109, 246, .18); }
}

@media (max-width: 340px) {
  .sf { padding: $sp-3; }
  .sf__row { font-size: 11px; }
}

@media (max-height: 220px) {
  .sf { padding: $sp-2 $sp-3; }
  .sf__title { margin-bottom: $sp-1; }
  .sf__row { padding: 4px 0; }
  .sf__save { margin-top: $sp-2; padding: $sp-1 $sp-4; }
}

@media (prefers-reduced-motion: reduce) {
  .sf__switch.is-demo .sf__knob { animation: none !important; }
  .sf__save.is-busy::before { animation: none !important; }
  .sf__switch, .sf__knob { transition: 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);
}

.sf {
  box-sizing: border-box;
  width: min(300px, 88vw);
  border-radius: 16px;
  padding: 16px;
  background: #fff;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.sf__title {
  margin: 0 0 12px;
  font-size: 13px;
  font-weight: 800;
  color: #17141a;
}

.sf__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0;
  font-size: 12px;
  font-weight: 600;
  color: rgba(23, 20, 26, 0.72);
  border-bottom: 1px solid rgba(23, 20, 26, 0.06);
}

.sf__switch {
  position: relative;
  width: 38px;
  height: 22px;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.15);
  cursor: pointer;
  transition: background 300ms cubic-bezier(0.2, 0.8, 0.2, 1);
  flex: 0 0 auto;
}

.sf__switch[aria-checked=true] {
  background: #2f6df6;
}

.sf__knob {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(23, 20, 26, 0.3);
  transition: transform 300ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.sf__switch[aria-checked=true] .sf__knob {
  transform: translateX(16px);
}

.sf__save {
  margin-top: 16px;
  width: 100%;
  border: 0;
  border-radius: 12px;
  padding: 8px 16px;
  background: #17141a;
  color: #fff7e6;
  font: inherit;
  font-weight: 700;
  font-size: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.sf__save::before {
  content: "";
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid transparent;
  display: none;
}

.sf__save.is-busy::before {
  display: block;
  border-color: rgba(255, 247, 230, 0.3);
  border-top-color: #fff7e6;
  animation: sf-spin 0.6s linear infinite;
}

.sf__save.is-done {
  background: #47905f;
}

@keyframes sf-spin {
  to {
    transform: rotate(360deg);
  }
}
.sf__switch.is-demo .sf__knob {
  animation: sf-glow 2s ease-in-out infinite;
}

@keyframes sf-glow {
  0%, 100% {
    box-shadow: 0 1px 3px rgba(23, 20, 26, 0.3), 0 0 0 0 rgba(47, 109, 246, 0);
  }
  50% {
    box-shadow: 0 1px 3px rgba(23, 20, 26, 0.3), 0 0 0 6px rgba(47, 109, 246, 0.18);
  }
}
@media (max-width: 340px) {
  .sf {
    padding: 12px;
  }
  .sf__row {
    font-size: 11px;
  }
}
@media (max-height: 220px) {
  .sf {
    padding: 8px 12px;
  }
  .sf__title {
    margin-bottom: 4px;
  }
  .sf__row {
    padding: 4px 0;
  }
  .sf__save {
    margin-top: 8px;
    padding: 4px 16px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .sf__switch.is-demo .sf__knob {
    animation: none !important;
  }
  .sf__save.is-busy::before {
    animation: none !important;
  }
  .sf__switch, .sf__knob {
    transition: none;
  }
}

// 실제 동작: 스위치를 누르면 실제로 켜짐/꺼짐이 바뀌고, 저장을 누르면 버튼이 저장중 → 저장됨으로 실제 Status 전이를 한다.
document.querySelectorAll('.sf__switch').forEach(function (sw) {
  function toggle() {
    sw.classList.remove('is-demo');
    var on = sw.getAttribute('aria-checked') === 'true';
    sw.setAttribute('aria-checked', String(!on));
  }
  sw.addEventListener('click', toggle);
  sw.addEventListener('keydown', function (e) { if (e.key === 'Enter' || e.key === ' ') { e.preventDefault(); toggle(); } });
});
var form = document.querySelector('.sf');
var save = document.querySelector('.sf__save');
var label = document.querySelector('.sf__save-label');
form.addEventListener('submit', function (e) {
  e.preventDefault();
  if (save.classList.contains('is-busy')) return;
  save.classList.add('is-busy');
  label.textContent = 'Saving';
  setTimeout(function () {
    save.classList.remove('is-busy');
    save.classList.add('is-done');
    label.textContent = 'Saved';
    setTimeout(function () {
      save.classList.remove('is-done');
      label.textContent = 'Save';
    }, 1600);
  }, 700);
});

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

export type SettingsFormProps = {
  duration?: number;
  easing?: string;
  color?: string;
};

type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };
type SaveState = "idle" | "busy" | "done";

export default function SettingsForm({ duration = 300, easing = "cubic-bezier(.2,.8,.2,1)", color = "#2f6df6" }: SettingsFormProps) {
  const [emailAlert, setEmailAlert] = useState(true);
  const [weeklyReport, setWeeklyReport] = useState(false);
  const [save, setSave] = useState<SaveState>("idle");
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  function onSubmit(e: { preventDefault: () => void }) {
    e.preventDefault();
    if (save === "busy") return;
    setSave("busy");
    setTimeout(() => {
      setSave("done");
      setTimeout(() => setSave("idle"), 1600);
    }, 700);
  }

  const label = save === "busy" ? "저장 중" : save === "done" ? "저장됨" : "저장";

  return (
    <form className={styles.sf} style={vars} onSubmit={onSubmit}>
      <h2 className={styles.title}>알림</h2>
      <label className={styles.row}>
        <span>이메일 알림</span>
        <span className={styles.switch} role="switch" aria-checked={emailAlert} tabIndex={0}
          onClick={() => setEmailAlert((v) => !v)}
          onKeyDown={(e: KeyboardEvent) => { if (e.key === "Enter" || e.key === " ") { e.preventDefault(); setEmailAlert((v) => !v); } }}
          data-on={emailAlert}
        >
          <span className={styles.knob} />
        </span>
      </label>
      <label className={styles.row}>
        <span>주간 리포트</span>
        <span className={styles.switch} role="switch" aria-checked={weeklyReport} tabIndex={0}
          onClick={() => setWeeklyReport((v) => !v)}
          onKeyDown={(e: KeyboardEvent) => { if (e.key === "Enter" || e.key === " ") { e.preventDefault(); setWeeklyReport((v) => !v); } }}
          data-on={weeklyReport}
        >
          <span className={styles.knob} />
        </span>
      </label>
      <button type="submit" className={`${styles.save} ${save === "busy" ? styles.busy : ""} ${save === "done" ? styles.done : ""}`}>
        {label}
      </button>
    </form>
  );
}