08Mobile bottom toast

<main class="stage">
  <div class="toast is-demo" role="status" aria-live="polite">
    <p class="toast__text">New update available</p>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────
$duration: $dur-enter;    // 600ms — 아래에서 올라오는 시간
$easing: $ease-spring;
$color: $subject-blue;    // 글자 대비용 참고색(테두리 없음, 변형에서 강조선에 쓴다)

// ── 데모 무대 ───────────────────────────────
@include stage($stage-paper);

// 모바일 하단 고정 스트립 — 03 편의 bottom-sheet(손잡이 달린 큰 패널)와 달리
// 한 줄짜리 알약형이고 안전영역을 고려해 자동으로 사라진다 (모달이 아니라 알림이다)
.toast {
  position: fixed;
  left: $sp-4; right: $sp-4;
  bottom: calc(env(safe-area-inset-bottom, 0px) + #{$sp-4});
  margin: 0 auto;
  max-width: 340px;
  padding: $sp-3 $sp-5;
  border-radius: $r-pill;
  background: $subject-ink;
  color: $subject-cream;
  box-shadow: $shadow-raised;
  text-align: center;
  transform: translateY(140%);
  opacity: 0;
}
.toast__text { margin: 0; font-weight: 600; font-size: 13px; line-height: 1.4; font-family: inherit; }

.toast.is-demo { animation: bottom-loop $dur-loop $easing infinite; }

@keyframes bottom-loop {
  0%   { transform: translateY(140%); opacity: 0; }
  20%  { transform: translateY(0); opacity: 1; }
  78%  { transform: translateY(0); opacity: 1; }
  100% { transform: translateY(140%); opacity: 0; }
}

// ── 접근성: 움직임 줄이기 설정이면 뜬 채로 고정 ────────
@media (prefers-reduced-motion: reduce) {
  .toast.is-demo { animation: none; transform: translateY(0); opacity: 1; }
}

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);
}

.toast {
  position: fixed;
  left: 16px;
  right: 16px;
  bottom: calc(env(safe-area-inset-bottom, 0px) + 16px);
  margin: 0 auto;
  max-width: 340px;
  padding: 12px 20px;
  border-radius: 999px;
  background: #17141a;
  color: #fff7e6;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  text-align: center;
  transform: translateY(140%);
  opacity: 0;
}

.toast__text {
  margin: 0;
  font-weight: 600;
  font-size: 13px;
  line-height: 1.4;
  font-family: inherit;
}

.toast.is-demo {
  animation: bottom-loop 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

@keyframes bottom-loop {
  0% {
    transform: translateY(140%);
    opacity: 0;
  }
  20% {
    transform: translateY(0);
    opacity: 1;
  }
  78% {
    transform: translateY(0);
    opacity: 1;
  }
  100% {
    transform: translateY(140%);
    opacity: 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  .toast.is-demo {
    animation: none;
    transform: translateY(0);
    opacity: 1;
  }
}

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

export type BottomMobileToastProps = {
  message: string;
  visible: boolean;
  duration?: number;
  easing?: string;
};

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

export default function BottomMobileToast({
  message,
  visible,
  duration = 600,
  easing = "cubic-bezier(.2,.8,.2,1)",
}: BottomMobileToastProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing };

  return (
    <div className={`${styles.toast} ${visible ? styles.isVisible : ""}`} style={vars} role="status" aria-live="polite">
      <p className={styles.text}>{message}</p>
    </div>
  );
}