04Multi-column waterfall (columns)

<main class="stage">
  <ul class="gallery is-demo" aria-label="Photo gallery">
    <li class="tile tile--a" tabindex="0"></li>
    <li class="tile tile--b" tabindex="0"></li>
    <li class="tile tile--c" tabindex="0"></li>
    <li class="tile tile--d" tabindex="0"></li>
    <li class="tile tile--e" tabindex="0"></li>
  </ul>
</main>

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

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

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

.gallery {
  columns: 2;
  column-gap: $sp-2;
  list-style: none;
  margin: 0;
  padding: 0;
  width: 176px;
  max-width: 100%;
}
.tile {
  break-inside: avoid;
  margin: 0 0 $sp-2;
  border-radius: $r-sm;
  outline: none;
  cursor: pointer;
  box-shadow: $shadow-press;
  opacity: 1;
  transform: translateY(0);
  transition: transform $duration $easing, box-shadow $duration $easing;
}
.tile--a { height: 40px; background: linear-gradient(150deg, $color 0%, $stage-ink 100%); }
.tile--b { height: 52px; background: linear-gradient(210deg, $subject-cream 0%, $color 100%); }
.tile--c { height: 34px; background: linear-gradient(60deg, $stage-ink 0%, $color 100%); }
.tile--d { height: 46px; background: linear-gradient(160deg, $color 0%, $subject-cream 100%); }
.tile--e { height: 38px; background: linear-gradient(320deg, $subject-cream 0%, $stage-ink 100%); }

.tile:hover, .tile:focus-visible, .tile:active {
  transform: translateY(-3px);
  box-shadow: $shadow-raised;
}

.gallery.is-demo .tile { animation: rise-loop $dur-loop $easing infinite; }
.gallery.is-demo .tile--b { animation-delay: -0.4s; }
.gallery.is-demo .tile--c { animation-delay: -0.8s; }
.gallery.is-demo .tile--d { animation-delay: -1.2s; }
.gallery.is-demo .tile--e { animation-delay: -1.6s; }

@keyframes rise-loop {
  0%, 8%   { transform: translateY(0); box-shadow: $shadow-press; }
  24%, 40% { transform: translateY(-3px); box-shadow: $shadow-raised; }
  56%, 100% { transform: translateY(0); box-shadow: $shadow-press; }
}

@media (hover: none) {
  .tile:active { transform: translateY(-3px); 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: #ffffff;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

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

.gallery {
  columns: 2;
  column-gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  width: 176px;
  max-width: 100%;
}

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

.tile--a {
  height: 40px;
  background: linear-gradient(150deg, #2f6df6 0%, #17141a 100%);
}

.tile--b {
  height: 52px;
  background: linear-gradient(210deg, #fff7e6 0%, #2f6df6 100%);
}

.tile--c {
  height: 34px;
  background: linear-gradient(60deg, #17141a 0%, #2f6df6 100%);
}

.tile--d {
  height: 46px;
  background: linear-gradient(160deg, #2f6df6 0%, #fff7e6 100%);
}

.tile--e {
  height: 38px;
  background: linear-gradient(320deg, #fff7e6 0%, #17141a 100%);
}

.tile:hover, .tile:focus-visible, .tile:active {
  transform: translateY(-3px);
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}

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

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

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

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

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

@keyframes rise-loop {
  0%, 8% {
    transform: translateY(0);
    box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  }
  24%, 40% {
    transform: translateY(-3px);
    box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  }
  56%, 100% {
    transform: translateY(0);
    box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  }
}
@media (hover: none) {
  .tile:active {
    transform: translateY(-3px);
    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 "./MasonryColumnsGallery.module.scss";

export type MasonryColumnsGalleryProps = {
  /** 타일 높이(px) 배열 — 사진마다 다른 높이 */
  heights?: number[];
  /** 타일이 나타나는 시간 (기본 220ms) */
  duration?: number;
  easing?: string;
  color?: string;
};

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

/** columns: 2 만으로 자바스크립트 없이 워터폴을 만든다. break-inside: avoid 로 사진이 반으로 잘리지 않는다 */
export default function MasonryColumnsGallery({
  heights = [40, 52, 34, 46, 38],
  duration = 220,
  easing = "ease-out",
  color = "#2f6df6",
}: MasonryColumnsGalleryProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  return (
    <ul className={styles.gallery} style={vars} aria-label="Photo gallery">
      {heights.map((h, i) => (
        <li key={i} className={styles.tile} style={{ height: h }} tabIndex={0} />
      ))}
    </ul>
  );
}