05Grid-row-span waterfall (keeps reading order)

<main class="stage">
  <ul class="gallery is-demo" aria-label="Photo gallery">
    <li class="tile tile--1" tabindex="0"></li>
    <li class="tile tile--2" tabindex="0"></li>
    <li class="tile tile--3" tabindex="0"></li>
    <li class="tile tile--4" tabindex="0"></li>
    <li class="tile tile--5" tabindex="0"></li>
  </ul>
</main>

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

$duration: $dur-quick;                                 // 타일이 나타나는 시간
$easing: $ease-out;
$color: $subject-cream;                                 // 타일 그러데이션

@include stage($stage-ink);
.stage { padding: clamp(8px, 2.4vw, 16px); }

.gallery {
  display: grid;
  grid-auto-flow: row dense;
  grid-template-columns: repeat(2, 1fr);
  grid-auto-rows: 4px;
  column-gap: $sp-2;
  list-style: none;
  margin: 0;
  padding: 0;
  width: 176px;
  max-width: 100%;
}
.tile {
  margin-bottom: $sp-2;
  border-radius: $r-sm;
  outline: none;
  cursor: pointer;
  box-shadow: $shadow-press;
  transform: scale(1);
  transition: transform $duration $easing, box-shadow $duration $easing;
}
// 사진마다 자기 높이에 맞는 span — 읽는 순서(1→2→3→4→5)대로 배치된다
.tile--1 { grid-row-end: span 10; background: linear-gradient(150deg, $color 0%, $stage-ink 100%); }
.tile--2 { grid-row-end: span 13; background: linear-gradient(210deg, $subject-blue 0%, $color 100%); }
.tile--3 { grid-row-end: span 9;  background: linear-gradient(60deg, $stage-ink 0%, $color 100%); }
.tile--4 { grid-row-end: span 12; background: linear-gradient(300deg, $color 0%, $subject-blue 100%); }
.tile--5 { grid-row-end: span 10; background: linear-gradient(20deg, $subject-blue 0%, $stage-ink 100%); }

.tile:hover, .tile:focus-visible, .tile:active {
  transform: scale(1.05);
  box-shadow: $shadow-raised;
}

.gallery.is-demo .tile { animation: pop-loop $dur-loop $easing infinite; }
.gallery.is-demo .tile--2 { animation-delay: -0.4s; }
.gallery.is-demo .tile--3 { animation-delay: -0.8s; }
.gallery.is-demo .tile--4 { animation-delay: -1.2s; }
.gallery.is-demo .tile--5 { animation-delay: -1.6s; }

@keyframes pop-loop {
  0%, 8%    { transform: scale(1); box-shadow: $shadow-press; }
  24%, 40%  { transform: scale(1.05); box-shadow: $shadow-raised; }
  56%, 100% { transform: scale(1); box-shadow: $shadow-press; }
}

@media (hover: none) {
  .tile:active { transform: scale(1.05); box-shadow: $shadow-raised; }
}
@media (prefers-reduced-motion: reduce) {
  .tile { transition: none; }
  .gallery.is-demo .tile { animation: 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);
}

.stage {
  padding: clamp(8px, 2.4vw, 16px);
}

.gallery {
  display: grid;
  grid-auto-flow: row dense;
  grid-template-columns: repeat(2, 1fr);
  grid-auto-rows: 4px;
  column-gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  width: 176px;
  max-width: 100%;
}

.tile {
  margin-bottom: 8px;
  border-radius: 8px;
  outline: none;
  cursor: pointer;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  transform: scale(1);
  transition: transform 220ms ease-out, box-shadow 220ms ease-out;
}

.tile--1 {
  grid-row-end: span 10;
  background: linear-gradient(150deg, #fff7e6 0%, #17141a 100%);
}

.tile--2 {
  grid-row-end: span 13;
  background: linear-gradient(210deg, #2f6df6 0%, #fff7e6 100%);
}

.tile--3 {
  grid-row-end: span 9;
  background: linear-gradient(60deg, #17141a 0%, #fff7e6 100%);
}

.tile--4 {
  grid-row-end: span 12;
  background: linear-gradient(300deg, #fff7e6 0%, #2f6df6 100%);
}

.tile--5 {
  grid-row-end: span 10;
  background: linear-gradient(20deg, #2f6df6 0%, #17141a 100%);
}

.tile:hover, .tile:focus-visible, .tile:active {
  transform: scale(1.05);
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}

.gallery.is-demo .tile {
  animation: pop-loop 2s ease-out infinite;
}

.gallery.is-demo .tile--2 {
  animation-delay: -0.4s;
}

.gallery.is-demo .tile--3 {
  animation-delay: -0.8s;
}

.gallery.is-demo .tile--4 {
  animation-delay: -1.2s;
}

.gallery.is-demo .tile--5 {
  animation-delay: -1.6s;
}

@keyframes pop-loop {
  0%, 8% {
    transform: scale(1);
    box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  }
  24%, 40% {
    transform: scale(1.05);
    box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  }
  56%, 100% {
    transform: scale(1);
    box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  }
}
@media (hover: none) {
  .tile:active {
    transform: scale(1.05);
    box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  }
}
@media (prefers-reduced-motion: reduce) {
  .tile {
    transition: none;
  }
  .gallery.is-demo .tile {
    animation: none;
  }
}

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

export type MasonryGridGalleryProps = {
  /** 4px 행 단위로 각 사진이 차지할 span 수 — 자기 높이에 맞게 미리 계산한다 */
  spans?: number[];
  duration?: number;
  easing?: string;
  color?: string;
};

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

/** grid-auto-rows 를 작은 단위로 쪼개고 grid-row-end: span N 을 주면, 컬럼 방식과 달리 읽는 순서(왼→오)가 유지된다 */
export default function MasonryGridGallery({
  spans = [10, 13, 9, 12, 10],
  duration = 220,
  easing = "ease-out",
  color = "#fff7e6",
}: MasonryGridGalleryProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  return (
    <ul className={styles.gallery} style={vars} aria-label="Photo gallery">
      {spans.map((s, i) => (
        <li key={i} className={styles.tile} style={{ gridRowEnd: `span ${s}` }} tabIndex={0} />
      ))}
    </ul>
  );
}