06Retro sun and perspective grid

<main class="stage">
<div class="rt is-demo" id="rtRoot">
  <span class="rt__star rt__star--a"></span>
  <span class="rt__star rt__star--b"></span>
  <span class="rt__star rt__star--c"></span>
  <span class="rt__star rt__star--d"></span>
  <span class="rt__comet"></span>
  <span class="rt__shot"><span class="rt__streak"></span></span>
  <div class="rt__sun">
    <span class="rt__sunball"></span>
    <span class="rt__sunlines"></span>
  </div>
  <span class="rt__mount rt__mount--l"></span>
  <span class="rt__mount rt__mount--r"></span>
  <div class="rt__floor">
    <div class="rt__grid"></div>
  </div>
  <span class="rt__palm rt__palm--big"></span>
  <span class="rt__palm rt__palm--small"></span>
  <p class="rt__title">RETRO CSS</p>
  <button class="rt__fire" id="rtFire" type="button" aria-pressed="false">Fire a comet</button>
</div>
</main>

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

// 레트로 해와 원근 그리드 — 줄무늬 해, 야자수, 원근 그리드 바닥을 도형으로 쌓는다.
// 그리드는 perspective + rotateX 로 눕혀 놓고 트랙을 세로로 흘려 다가오는 느낌을 낸다.
// 제목 글자는 text-shadow 네온. 유성은 루프(짧게 주기적으로) + 버튼(한 번 발사) 두 가지.

$duration: $dur-loop;
$easing: $ease-out;
$color: $subject-pink;

$sun-top: #d9c5b3;
$sun-bottom: #d6acbf;
$neon-cyan: #cee6e7;
$grid-pink: #ddb9c8;
$night: #0d0a12;
$ridge: #16101e;

@include stage($stage-ink);

.rt {
  position: relative;
  width: min(100%, 320px); height: 172px;
  border-radius: $r-card; overflow: hidden;
  display: block;
}

// 별
.rt__star {
  position: absolute; width: 3px; height: 3px; border-radius: 50%;
  background: $subject-cream;
  animation-name: rtTwinkle; animation-duration: $duration;
  animation-timing-function: ease-in-out; animation-iteration-count: infinite;
  animation-direction: alternate; animation-fill-mode: both;
}
.rt__star--a { left: 10%; top: 12%; }
.rt__star--b { left: 30%; top: 8%; animation-delay: 320ms; }
.rt__star--c { left: 84%; top: 16%; animation-delay: 640ms; }
.rt__star--d { left: 66%; top: 6%; animation-delay: 960ms; }

// ── 해: 그라디언트 원 + 아랫절반 가로 줄눈
.rt__sun {
  position: absolute; left: 50%; top: 26px; width: 88px; height: 88px;
  margin-left: -44px; border-radius: 50%;
  animation-name: rtSunPulse; animation-duration: $duration;
  animation-timing-function: $easing; animation-iteration-count: infinite;
  animation-direction: alternate;
}
.rt__sunball {
  position: absolute; inset: 0; border-radius: 50%;
  background: linear-gradient(180deg, $sun-top 0%, $sun-bottom 100%);
  box-shadow: 0 0 32px rgba(244, 86, 157, .55);
}
.rt__sunlines {
  position: absolute; left: 0; right: 0; bottom: 0; height: 52%;
  border-radius: 0 0 $r-pill $r-pill; overflow: hidden;
  background: repeating-linear-gradient(0deg, transparent 0 9px, $night 9px 13px);
}

// 산 실루엣
.rt__mount {
  position: absolute; top: 84px; width: 70px; height: 40px;
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
  background: $ridge;
}
.rt__mount--l { left: -8px; }
.rt__mount--r { right: -8px; width: 54px; height: 32px; }

// ── 원근 그리드 바닥: 눕힌 트랙이 세로로 흐른다
.rt__floor {
  position: absolute; left: 0; right: 0; bottom: 0; height: 62px;
  perspective: 240px; overflow: hidden;
}
.rt__grid {
  position: absolute; left: -60%; top: -100%; width: 220%; height: 200%;
  transform: rotateX(58deg); transform-origin: top center;
  background:
    repeating-linear-gradient(90deg, rgba($grid-pink, .8) 0 2px, transparent 2px 44px),
    repeating-linear-gradient(0deg, rgba($grid-pink, .55) 0 2px, transparent 2px 36px);
  animation-name: rtGridFlow; animation-duration: $duration;
  animation-timing-function: linear; animation-iteration-count: infinite;
}
// 그리드 흐름: 눕힌 면 위를 세로로 한 칸(36px)만큼 이동 — transform 만 쓴다

// 야자수 실루엣
.rt__palm {
  position: absolute;
  width: 0; height: 0;
  border-left: 12px solid transparent; border-right: 12px solid transparent;
  border-bottom: 26px solid $ridge;
}
.rt__palm--big { right: 34px; top: 72px; }
.rt__palm--small { right: 82px; top: 92px; transform: scale(.6); transform-origin: top center; }

// 제목 네온
.rt__title {
  position: absolute; left: 0; right: 0; top: 10px; margin: 0;
  text-align: center; font-weight: 900; font-size: 21px; line-height: 1;
  letter-spacing: 3px; color: $neon-cyan;
  text-shadow: 0 0 8px rgba(126, 249, 255, .8), 0 0 22px rgba(126, 249, 255, .4);
}

// 루프 유성: 오른쪽 위에서 왼쪽 아래로 짧게 주기적으로
.rt__comet {
  position: absolute; left: 74%; top: 20%; width: 34px; height: 3px;
  border-radius: $r-pill;
  background: linear-gradient(270deg, $subject-cream, rgba(255, 247, 230, 0));
  transform: rotate(18deg);
  animation-name: rtCometLoop; animation-duration: $duration;
  animation-timing-function: $ease-out; animation-iteration-count: infinite;
  animation-fill-mode: both;
}
// 버튼 유성: transition 한 번
.rt__shot {
  position: absolute; left: 22%; top: 16%; width: 34px; height: 3px;
  border-radius: $r-pill; opacity: 0;
  transform: rotate(18deg);
  transition: transform 700ms $ease-out, opacity 160ms linear;
}
.rt__streak {
  display: block; width: 34px; height: 3px; border-radius: $r-pill;
  background: linear-gradient(270deg, $neon-cyan, rgba(126, 249, 255, 0));
}
.rt.is-shot .rt__shot {
  opacity: 1; transform: translateX(-96px) translateY(34px) rotate(18deg);
}

.rt__fire {
  position: absolute; right: $sp-2; bottom: $sp-2;
  padding: $sp-1 $sp-3; border: 0; border-radius: $r-pill;
  background: $subject-blue-deep; color: $subject-cream;
  font-family: inherit; font-weight: 700; font-size: 11px; line-height: 1.2;
  cursor: pointer;
}

@keyframes rtSunPulse {
  from { transform: scale(1); }
  to { transform: scale(1.05); }
}
@keyframes rtGridFlow {
  from { transform: rotateX(58deg) translateY(0); }
  to { transform: rotateX(58deg) translateY(36px); }
}
@keyframes rtTwinkle {
  from { opacity: .25; }
  to { opacity: 1; }
}
@keyframes rtCometLoop {
  0%, 44% { transform: translateX(0) translateY(0) rotate(18deg); opacity: 0; }
  48% { opacity: 1; }
  72%, 100% { transform: translateX(-88px) translateY(31px) rotate(18deg); opacity: 0; }
}

// 사람이 누른 상태: 루프 유성만 끊고(버튼 유성으로 본다) 나머지는 계속 흐른다
.rt:not(.is-demo) .rt__comet { animation-name: none; opacity: 0; }

@media (max-width: 340px) {
  .rt { height: 136px; }
  .rt__sun { top: 20px; width: 68px; height: 68px; margin-left: -34px; }
  .rt__mount { top: 66px; }
  .rt__palm--big { right: 22px; top: 58px; }
  .rt__palm--small { right: 62px; top: 74px; }
  .rt__floor { height: 48px; }
  .rt__title { font-size: 16px; letter-spacing: 2px; }
}

@media (prefers-reduced-motion: reduce) {
  .rt__star, .rt__sun, .rt__grid, .rt__comet { animation-name: none !important; }
  .rt__shot { transition: none !important; }
}

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);
}

.rt {
  position: relative;
  width: min(100%, 320px);
  height: 172px;
  border-radius: 16px;
  overflow: hidden;
  display: block;
}

.rt__star {
  position: absolute;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: #fff7e6;
  animation-name: rtTwinkle;
  animation-duration: 2s;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
  animation-direction: alternate;
  animation-fill-mode: both;
}

.rt__star--a {
  left: 10%;
  top: 12%;
}

.rt__star--b {
  left: 30%;
  top: 8%;
  animation-delay: 320ms;
}

.rt__star--c {
  left: 84%;
  top: 16%;
  animation-delay: 640ms;
}

.rt__star--d {
  left: 66%;
  top: 6%;
  animation-delay: 960ms;
}

.rt__sun {
  position: absolute;
  left: 50%;
  top: 26px;
  width: 88px;
  height: 88px;
  margin-left: -44px;
  border-radius: 50%;
  animation-name: rtSunPulse;
  animation-duration: 2s;
  animation-timing-function: ease-out;
  animation-iteration-count: infinite;
  animation-direction: alternate;
}

.rt__sunball {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: linear-gradient(180deg, #d9c5b3 0%, #d6acbf 100%);
  box-shadow: 0 0 32px rgba(244, 86, 157, 0.55);
}

.rt__sunlines {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 52%;
  border-radius: 0 0 999px 999px;
  overflow: hidden;
  background: repeating-linear-gradient(0deg, transparent 0 9px, #0d0a12 9px 13px);
}

.rt__mount {
  position: absolute;
  top: 84px;
  width: 70px;
  height: 40px;
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
  background: #16101e;
}

.rt__mount--l {
  left: -8px;
}

.rt__mount--r {
  right: -8px;
  width: 54px;
  height: 32px;
}

.rt__floor {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 62px;
  perspective: 240px;
  overflow: hidden;
}

.rt__grid {
  position: absolute;
  left: -60%;
  top: -100%;
  width: 220%;
  height: 200%;
  transform: rotateX(58deg);
  transform-origin: top center;
  background: repeating-linear-gradient(90deg, rgba(221, 185, 200, 0.8) 0 2px, transparent 2px 44px), repeating-linear-gradient(0deg, rgba(221, 185, 200, 0.55) 0 2px, transparent 2px 36px);
  animation-name: rtGridFlow;
  animation-duration: 2s;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}

.rt__palm {
  position: absolute;
  width: 0;
  height: 0;
  border-left: 12px solid transparent;
  border-right: 12px solid transparent;
  border-bottom: 26px solid #16101e;
}

.rt__palm--big {
  right: 34px;
  top: 72px;
}

.rt__palm--small {
  right: 82px;
  top: 92px;
  transform: scale(0.6);
  transform-origin: top center;
}

.rt__title {
  position: absolute;
  left: 0;
  right: 0;
  top: 10px;
  margin: 0;
  text-align: center;
  font-weight: 900;
  font-size: 21px;
  line-height: 1;
  letter-spacing: 3px;
  color: #cee6e7;
  text-shadow: 0 0 8px rgba(126, 249, 255, 0.8), 0 0 22px rgba(126, 249, 255, 0.4);
}

.rt__comet {
  position: absolute;
  left: 74%;
  top: 20%;
  width: 34px;
  height: 3px;
  border-radius: 999px;
  background: linear-gradient(270deg, #fff7e6, rgba(255, 247, 230, 0));
  transform: rotate(18deg);
  animation-name: rtCometLoop;
  animation-duration: 2s;
  animation-timing-function: ease-out;
  animation-iteration-count: infinite;
  animation-fill-mode: both;
}

.rt__shot {
  position: absolute;
  left: 22%;
  top: 16%;
  width: 34px;
  height: 3px;
  border-radius: 999px;
  opacity: 0;
  transform: rotate(18deg);
  transition: transform 700ms ease-out, opacity 160ms linear;
}

.rt__streak {
  display: block;
  width: 34px;
  height: 3px;
  border-radius: 999px;
  background: linear-gradient(270deg, #cee6e7, rgba(126, 249, 255, 0));
}

.rt.is-shot .rt__shot {
  opacity: 1;
  transform: translateX(-96px) translateY(34px) rotate(18deg);
}

.rt__fire {
  position: absolute;
  right: 8px;
  bottom: 8px;
  padding: 4px 12px;
  border: 0;
  border-radius: 999px;
  background: #0a4fe8;
  color: #fff7e6;
  font-family: inherit;
  font-weight: 700;
  font-size: 11px;
  line-height: 1.2;
  cursor: pointer;
}

@keyframes rtSunPulse {
  from {
    transform: scale(1);
  }
  to {
    transform: scale(1.05);
  }
}
@keyframes rtGridFlow {
  from {
    transform: rotateX(58deg) translateY(0);
  }
  to {
    transform: rotateX(58deg) translateY(36px);
  }
}
@keyframes rtTwinkle {
  from {
    opacity: 0.25;
  }
  to {
    opacity: 1;
  }
}
@keyframes rtCometLoop {
  0%, 44% {
    transform: translateX(0) translateY(0) rotate(18deg);
    opacity: 0;
  }
  48% {
    opacity: 1;
  }
  72%, 100% {
    transform: translateX(-88px) translateY(31px) rotate(18deg);
    opacity: 0;
  }
}
.rt:not(.is-demo) .rt__comet {
  animation-name: none;
  opacity: 0;
}

@media (max-width: 340px) {
  .rt {
    height: 136px;
  }
  .rt__sun {
    top: 20px;
    width: 68px;
    height: 68px;
    margin-left: -34px;
  }
  .rt__mount {
    top: 66px;
  }
  .rt__palm--big {
    right: 22px;
    top: 58px;
  }
  .rt__palm--small {
    right: 62px;
    top: 74px;
  }
  .rt__floor {
    height: 48px;
  }
  .rt__title {
    font-size: 16px;
    letter-spacing: 2px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .rt__star, .rt__sun, .rt__grid, .rt__comet {
    animation-name: none !important;
  }
  .rt__shot {
    transition: none !important;
  }
}

// 유성: 미리보기 루프와 별개로, 누를 때마다 .is-shot 을 다시 걸어
// 대각선 스트릭을 transition 으로 한 번 가로지르게 한다.
(function () {
  var root = document.getElementById('rtRoot');
  var btn = document.getElementById('rtFire');
  btn.addEventListener('click', function () {
    root.classList.remove('is-demo');
    root.classList.remove('is-shot');
    window.requestAnimationFrame(function () {
      root.classList.add('is-shot');
    });
  });
})();

// RetroSunGrid — vanilla 판(run/078/demo/06-object-retro-sun-grid/index.html) 의 React 포트.
// 유성: 누를 때마다 한 번 대각선으로 가로지른다(is-shot). 첫 클릭에 미리보기 루프를 뗀다.
import { useState } from "react";
import type { CSSProperties } from "react";
import styles from "./RetroSunGrid.module.scss";

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

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

export default function RetroSunGrid(props: RetroSunGridProps) {
  const duration = props.duration ?? 2000;
  const easing = props.easing ?? "ease-out";
  const color = props.color ?? "#ff9ebb";
  const title = props.title ?? "RETRO CSS";
  const [shot, setShot] = useState<boolean>(false);
  const [preview, setPreview] = useState<boolean>(true);

  const vars: Vars = { "--duration": duration + "ms", "--easing": easing, "--color": color };
  const rootClass = ["rt", preview ? "is-demo" : "", shot ? "is-shot" : ""]
    .filter(Boolean).map((c) => (styles as { [k: string]: string })[c]).join(" ");

  return (
    <main className={styles.stage}>
      <div className={rootClass} style={vars}>
        <span className={styles["rt__star"] + " " + styles["rt__star--a"]}></span>
        <span className={styles["rt__star"] + " " + styles["rt__star--b"]}></span>
        <span className={styles["rt__star"] + " " + styles["rt__star--c"]}></span>
        <span className={styles["rt__star"] + " " + styles["rt__star--d"]}></span>
        <span className={styles["rt__comet"]}></span>
        <span className={styles["rt__shot"]}><span className={styles["rt__streak"]}></span></span>
        <div className={styles["rt__sun"]}>
          <span className={styles["rt__sunball"]}></span>
          <span className={styles["rt__sunlines"]}></span>
        </div>
        <span className={styles["rt__mount"] + " " + styles["rt__mount--l"]}></span>
        <span className={styles["rt__mount"] + " " + styles["rt__mount--r"]}></span>
        <div className={styles["rt__floor"]}>
          <div className={styles["rt__grid"]}></div>
        </div>
        <span className={styles["rt__palm"] + " " + styles["rt__palm--big"]}></span>
        <span className={styles["rt__palm"] + " " + styles["rt__palm--small"]}></span>
        <p className={styles["rt__title"]}>{title}</p>
        <button
          className={styles["rt__fire"]}
          type="button"
          aria-pressed={shot ? "true" : "false"}
          onClick={() => { setPreview(false); setShot(false); requestAnimationFrame(() => setShot(true)); }}
        >
          유성 쏘기
        </button>
      </div>
    </main>
  );
}