04Rocket shape

<main class="stage">
  <button type="button" class="totop is-demo" aria-label="Launch to top">
    <svg class="totop__rocket" viewBox="0 0 24 28" aria-hidden="true">
      <path class="totop__body" d="M12 1 C17 6 18 12 16 18 L8 18 C6 12 7 6 12 1 Z"/>
      <circle class="totop__window" cx="12" cy="10" r="2.4"/>
      <path class="totop__fin totop__fin--l" d="M8 15 L3 20 L8 19 Z"/>
      <path class="totop__fin totop__fin--r" d="M16 15 L21 20 L16 19 Z"/>
      <path class="totop__flame" d="M9.5 18 L12 25 L14.5 18 Z"/>
    </svg>
  </button>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: 700ms;
$easing: $ease-out;
$color: $stage-orange;     // 불꽃 색

@include stage($stage-paper);

.totop {
  width: 60px; height: 60px;
  border: 0;
  border-radius: $r-pill;
  background: $subject-ink;
  display: grid;
  place-items: center;
  box-shadow: $shadow-raised;
  cursor: pointer;
}

.totop__rocket {
  width: 26px; height: 30px;
  transform-origin: center bottom;
}
.totop__body { fill: $stage-paper; }
.totop__window { fill: $subject-ink; }
.totop__fin { fill: $subject-cream; }
.totop__flame {
  fill: $color;
  transform-origin: center top;
  opacity: 0;
}

// 실제 사용: 마우스를 올리거나 포커스하면 1회 발사
.totop:hover .totop__rocket,
.totop:focus-visible .totop__rocket { animation: rocket-launch $duration $easing 1; }
.totop:hover .totop__flame,
.totop:focus-visible .totop__flame { animation: flame-flicker $duration $easing 1; }

// 데모 루프 — 같은 모양을 2초 주기 뒤쪽에 압축해 자동 재생 (064-02 와 같은 기법)
.totop.is-demo .totop__rocket { animation: rocket-launch-loop 2s $easing infinite; }
.totop.is-demo .totop__flame { animation: flame-flicker-loop 2s $easing infinite; }

@keyframes rocket-launch {
  0%   { transform: translateY(0) rotate(0deg); }
  40%  { transform: translateY(-9px) rotate(-9deg); }
  100% { transform: translateY(-2px) rotate(-4deg); }
}
@keyframes flame-flicker {
  0%, 100% { opacity: 0; transform: scaleY(.6); }
  40%      { opacity: 1; transform: scaleY(1.3); }
  70%      { opacity: .7; transform: scaleY(.9); }
}
@keyframes rocket-launch-loop {
  0%, 55%  { transform: translateY(0) rotate(0deg); }
  75%      { transform: translateY(-9px) rotate(-9deg); }
  100%     { transform: translateY(-2px) rotate(-4deg); }
}
@keyframes flame-flicker-loop {
  0%, 55%, 100% { opacity: 0; transform: scaleY(.6); }
  75%           { opacity: 1; transform: scaleY(1.3); }
  90%           { opacity: .7; transform: scaleY(.9); }
}

@media (prefers-reduced-motion: reduce) {
  .totop:hover .totop__rocket, .totop:focus-visible .totop__rocket,
  .totop.is-demo .totop__rocket,
  .totop:hover .totop__flame, .totop:focus-visible .totop__flame,
  .totop.is-demo .totop__flame { animation: 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);
}

.totop {
  width: 60px;
  height: 60px;
  border: 0;
  border-radius: 999px;
  background: #17141a;
  display: grid;
  place-items: center;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  cursor: pointer;
}

.totop__rocket {
  width: 26px;
  height: 30px;
  transform-origin: center bottom;
}

.totop__body {
  fill: #ffffff;
}

.totop__window {
  fill: #17141a;
}

.totop__fin {
  fill: #fff7e6;
}

.totop__flame {
  fill: #ff4d1f;
  transform-origin: center top;
  opacity: 0;
}

.totop:hover .totop__rocket,
.totop:focus-visible .totop__rocket {
  animation: rocket-launch 700ms ease-out 1;
}

.totop:hover .totop__flame,
.totop:focus-visible .totop__flame {
  animation: flame-flicker 700ms ease-out 1;
}

.totop.is-demo .totop__rocket {
  animation: rocket-launch-loop 2s ease-out infinite;
}

.totop.is-demo .totop__flame {
  animation: flame-flicker-loop 2s ease-out infinite;
}

@keyframes rocket-launch {
  0% {
    transform: translateY(0) rotate(0deg);
  }
  40% {
    transform: translateY(-9px) rotate(-9deg);
  }
  100% {
    transform: translateY(-2px) rotate(-4deg);
  }
}
@keyframes flame-flicker {
  0%, 100% {
    opacity: 0;
    transform: scaleY(0.6);
  }
  40% {
    opacity: 1;
    transform: scaleY(1.3);
  }
  70% {
    opacity: 0.7;
    transform: scaleY(0.9);
  }
}
@keyframes rocket-launch-loop {
  0%, 55% {
    transform: translateY(0) rotate(0deg);
  }
  75% {
    transform: translateY(-9px) rotate(-9deg);
  }
  100% {
    transform: translateY(-2px) rotate(-4deg);
  }
}
@keyframes flame-flicker-loop {
  0%, 55%, 100% {
    opacity: 0;
    transform: scaleY(0.6);
  }
  75% {
    opacity: 1;
    transform: scaleY(1.3);
  }
  90% {
    opacity: 0.7;
    transform: scaleY(0.9);
  }
}
@media (prefers-reduced-motion: reduce) {
  .totop:hover .totop__rocket, .totop:focus-visible .totop__rocket,
  .totop.is-demo .totop__rocket,
  .totop:hover .totop__flame, .totop:focus-visible .totop__flame,
  .totop.is-demo .totop__flame {
    animation: none;
  }
}

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

export type RocketButtonProps = {
  /** 발사 애니메이션 시간 (기본 700ms) */
  duration?: number;
  easing?: string;
  flameColor?: string;
};

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

// 실제 사용: 마우스를 올리거나 키보드로 포커스하면 로켓이 한 번 발사된다. 상태 없이 CSS 로 처리한다
export default function RocketButton({
  duration = 700,
  easing = "ease-out",
  flameColor = "#ff4d1f",
}: RocketButtonProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--flame": flameColor };
  return (
    <button
      type="button"
      className={styles.totop}
      style={vars}
      aria-label="맨 위로 발사"
      onClick={() => window.scrollTo({ top: 0, behavior: "smooth" })}
    >
      <svg className={styles.rocket} viewBox="0 0 24 28" aria-hidden="true">
        <path className={styles.body} d="M12 1 C17 6 18 12 16 18 L8 18 C6 12 7 6 12 1 Z" />
        <circle className={styles.window} cx="12" cy="10" r="2.4" />
        <path className={styles.fin} d="M8 15 L3 20 L8 19 Z" />
        <path className={styles.fin} d="M16 15 L21 20 L16 19 Z" />
        <path className={styles.flame} d="M9.5 18 L12 25 L14.5 18 Z" />
      </svg>
    </button>
  );
}