06Edge shade that says there is more to the side

<main class="stage">
  <section class="ot is-demo" id="ot" aria-label="Edge hint that says there is more to the side">
    <header class="ot__head">
      <p class="ot__title">Pricing comparison</p>
      <p class="ot__state" id="ot-state">More to the side</p>
    </header>
    <div class="ot__view" id="ot-view" tabindex="0" role="region" aria-label="Pricing table — look left and right">
      <div class="ot__track" id="ot-track">
        <div class="ot__card"><b>Free</b><span>$0</span><i>For one</i></div>
        <div class="ot__card"><b>Basic</b><span>$9</span><i>For five</i></div>
        <div class="ot__card"><b>Team</b><span>$19</span><i>For ten</i></div>
        <div class="ot__card"><b>Group</b><span>$39</span><i>No limit</i></div>
      </div>
    </div>
    <div class="ot__shade ot__shade--l" id="ot-l" aria-hidden="true"></div>
    <div class="ot__shade ot__shade--r" id="ot-r" aria-hidden="true">
      <span class="ot__nudge"><svg viewBox="0 0 256 256" width="1em" height="1em" fill="currentColor" aria-hidden="true"><path d="M176,128,96,208V48Z" opacity="0.2"/><path d="M181.66,122.34l-80-80A8,8,0,0,0,88,48V208a8,8,0,0,0,13.66,5.66l80-80A8,8,0,0,0,181.66,122.34ZM104,188.69V67.31L164.69,128Z"/></svg></span>
    </div>
    <p class="ot__note" aria-hidden="true">The faded edges mark what you have not reached yet</p>
  </section>
</main>

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

// 옆으로 더 있다고 알려 주는 가장자리 그늘 — 스크롤포트와 트랙을 분리하고 transform 은 트랙에만
$duration: $dur-loop;
$easing: $ease-out;
$color: $subject-ink;

@include stage($stage-yellow);

.ot {
  position: relative;
  box-sizing: border-box;
  width: min(300px, 92vw);
  border-radius: $r-card;
  background: $subject-cream;
  color: $subject-ink;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  overflow: hidden;
}

.ot__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: $sp-2;
  padding: $sp-2 $sp-3 0;
}
.ot__title {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.3;
}
.ot__state {
  margin: 0;
  font-size: 10px;
  line-height: 1.3;
  color: rgba($stage-ink, .72);
}

// 스크롤포트(overflow) — 이 상자 자체에는 transform 을 걸지 않는다 (051 실측)
.ot__view {
  box-sizing: border-box;
  height: 116px;
  margin: $sp-2 $sp-2 0;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  scroll-snap-type: x mandatory;
  &::-webkit-scrollbar { display: none; }
  &:focus-visible { outline: 2px solid $color; outline-offset: 2px; }
}
.ot__track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 72%;
  gap: $sp-2;
  width: max-content;
  height: 100%;
  padding: 0 $sp-1;
}
.ot__card {
  box-sizing: border-box;
  display: grid;
  align-content: center;
  justify-items: center;
  gap: $sp-1;
  padding: $sp-2;
  border-radius: $r-control;
  background: #f0ece2;
  scroll-snap-align: center;
}
.ot__card b { font-size: 11px; line-height: 1.3; }
.ot__card span { font-size: 16px; font-weight: 800; line-height: 1.2; color: $subject-blue-deep; }
.ot__card i { font-size: 9px; font-style: normal; line-height: 1.3; color: rgba($stage-ink, .72); }

// ── 가장자리 그늘 — 뷰 위에 얹힌다. linear-gradient 로 카드 끝을 감쪽같이 녹인다 ──
// 그늘의 세로 범위는 스크롤 상자와 정확히 같아야 한다 — 머리말·아래 설명까지 덮으면
// 카드 전체가 흐려 보인다 (실측: 상자는 카드 위에서 32px, 아래에서 30px 자리에 있다)
.ot__shade {
  position: absolute;
  top: 32px;
  bottom: 30px;
  width: 32px;
  pointer-events: none;
  opacity: 1;
  // 정적 경로 — 한쪽 끝에 닿으면 그쪽만 .is-off 로 꺼진다
  transition: opacity $dur-quick $easing;
}
.ot__shade--l {
  left: $sp-2;
  background: linear-gradient(to right, $subject-cream, rgba(255, 247, 230, 0));
}
.ot__shade--r {
  right: $sp-2;
  background: linear-gradient(to left, $subject-cream, rgba(255, 247, 230, 0));
  display: grid;
  align-items: end;
  justify-items: center;
}
.ot__shade.is-off { opacity: 0; }
.ot__nudge {
  display: inline-grid;
  place-items: center;
  width: 24px;
  height: 24px;
  margin-bottom: $sp-2;
  border-radius: 50%;
  background: $subject-ink;
  color: $stage-yellow;
  font-size: 13px;
  line-height: 1;
}

.ot__note {
  margin: 0;
  padding: $sp-2 $sp-3;
  font-size: 10px;
  line-height: 1.4;
  color: rgba($stage-ink, .72);
}

// ── 격자 미리보기 루프 — 트랙이 오른쪽으로 살짝 밀렸다 돌아오고 그늘·화살표가 호흡한다 ──
@keyframes ot-slide {
  0%, 16% { transform: translateX(0); }
  44%, 72% { transform: translateX(-56%); }
  92%, 100% { transform: translateX(0); }
}
@keyframes ot-shade-l {
  0%, 16% { opacity: 1; }
  20%, 72% { opacity: 0; }
  80%, 100% { opacity: 1; }
}
@keyframes ot-shade-r {
  0% { opacity: 1; }
  44%, 72% { opacity: 0; }
  80%, 100% { opacity: 1; }
}
@keyframes ot-nudge {
  0%, 10% { transform: translateX(0); }
  16% { transform: translateX(4px); }
  24%, 90% { transform: translateX(0); }
  94% { transform: translateX(4px); }
  100% { transform: translateX(0); }
}
@keyframes ot-say {
  0%, 42% { opacity: 1; }
  43%, 71% { opacity: .35; }
  72%, 100% { opacity: 1; }
}
.ot.is-demo {
  .ot__track {
    animation-name: ot-slide;
    animation-duration: $duration;
    animation-timing-function: $easing;
    animation-iteration-count: infinite;
    // 미리보기 동안 스냅이 트랙을 붙잡지 않게 (262 실측)
    scroll-snap-type: none;
  }
  .ot__shade--l {
    animation-name: ot-shade-l;
    animation-duration: $duration;
    animation-timing-function: steps(1, end);
    animation-iteration-count: infinite;
  }
  .ot__shade--r {
    animation-name: ot-shade-r;
    animation-duration: $duration;
    animation-timing-function: steps(1, end);
    animation-iteration-count: infinite;
  }
  .ot__nudge {
    animation-name: ot-nudge;
    animation-duration: $duration;
    animation-timing-function: $ease-spring;
    animation-iteration-count: infinite;
  }
  .ot__state {
    animation-name: ot-say;
    animation-duration: $duration;
    animation-timing-function: steps(1, end);
    animation-iteration-count: infinite;
  }
}

@media (max-width: 340px) {
  .ot__view { height: 104px; }
  .ot__track { grid-auto-columns: 78%; }
  .ot__shade { width: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  .ot.is-demo .ot__track,
  .ot.is-demo .ot__nudge,
  .ot.is-demo .ot__state { animation: none !important; transform: none !important; }
  // 정지 상태 — 왼쪽 끝에 있으니 왼쪽 그늘은 꺼지고 오른쪽만 켜진 채 머문다
  .ot.is-demo .ot__shade--l { animation: none !important; opacity: 0 !important; }
  .ot.is-demo .ot__shade--r { animation: none !important; opacity: 1 !important; }
}

html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffd23f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.ot {
  position: relative;
  box-sizing: border-box;
  width: min(300px, 92vw);
  border-radius: 16px;
  background: #fff7e6;
  color: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  overflow: hidden;
}

.ot__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 12px 0;
}

.ot__title {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.3;
}

.ot__state {
  margin: 0;
  font-size: 10px;
  line-height: 1.3;
  color: rgba(23, 20, 26, 0.72);
}

.ot__view {
  box-sizing: border-box;
  height: 116px;
  margin: 8px 8px 0;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  scroll-snap-type: x mandatory;
}
.ot__view::-webkit-scrollbar {
  display: none;
}
.ot__view:focus-visible {
  outline: 2px solid #17141a;
  outline-offset: 2px;
}

.ot__track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 72%;
  gap: 8px;
  width: max-content;
  height: 100%;
  padding: 0 4px;
}

.ot__card {
  box-sizing: border-box;
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 4px;
  padding: 8px;
  border-radius: 12px;
  background: #f0ece2;
  scroll-snap-align: center;
}

.ot__card b {
  font-size: 11px;
  line-height: 1.3;
}

.ot__card span {
  font-size: 16px;
  font-weight: 800;
  line-height: 1.2;
  color: #0a4fe8;
}

.ot__card i {
  font-size: 9px;
  font-style: normal;
  line-height: 1.3;
  color: rgba(23, 20, 26, 0.72);
}

.ot__shade {
  position: absolute;
  top: 32px;
  bottom: 30px;
  width: 32px;
  pointer-events: none;
  opacity: 1;
  transition: opacity 220ms ease-out;
}

.ot__shade--l {
  left: 8px;
  background: linear-gradient(to right, #fff7e6, rgba(255, 247, 230, 0));
}

.ot__shade--r {
  right: 8px;
  background: linear-gradient(to left, #fff7e6, rgba(255, 247, 230, 0));
  display: grid;
  align-items: end;
  justify-items: center;
}

.ot__shade.is-off {
  opacity: 0;
}

.ot__nudge {
  display: inline-grid;
  place-items: center;
  width: 24px;
  height: 24px;
  margin-bottom: 8px;
  border-radius: 50%;
  background: #17141a;
  color: #ffd23f;
  font-size: 13px;
  line-height: 1;
}

.ot__note {
  margin: 0;
  padding: 8px 12px;
  font-size: 10px;
  line-height: 1.4;
  color: rgba(23, 20, 26, 0.72);
}

@keyframes ot-slide {
  0%, 16% {
    transform: translateX(0);
  }
  44%, 72% {
    transform: translateX(-56%);
  }
  92%, 100% {
    transform: translateX(0);
  }
}
@keyframes ot-shade-l {
  0%, 16% {
    opacity: 1;
  }
  20%, 72% {
    opacity: 0;
  }
  80%, 100% {
    opacity: 1;
  }
}
@keyframes ot-shade-r {
  0% {
    opacity: 1;
  }
  44%, 72% {
    opacity: 0;
  }
  80%, 100% {
    opacity: 1;
  }
}
@keyframes ot-nudge {
  0%, 10% {
    transform: translateX(0);
  }
  16% {
    transform: translateX(4px);
  }
  24%, 90% {
    transform: translateX(0);
  }
  94% {
    transform: translateX(4px);
  }
  100% {
    transform: translateX(0);
  }
}
@keyframes ot-say {
  0%, 42% {
    opacity: 1;
  }
  43%, 71% {
    opacity: 0.35;
  }
  72%, 100% {
    opacity: 1;
  }
}
.ot.is-demo .ot__track {
  animation-name: ot-slide;
  animation-duration: 2s;
  animation-timing-function: ease-out;
  animation-iteration-count: infinite;
  scroll-snap-type: none;
}
.ot.is-demo .ot__shade--l {
  animation-name: ot-shade-l;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.ot.is-demo .ot__shade--r {
  animation-name: ot-shade-r;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.ot.is-demo .ot__nudge {
  animation-name: ot-nudge;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}
.ot.is-demo .ot__state {
  animation-name: ot-say;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}

@media (max-width: 340px) {
  .ot__view {
    height: 104px;
  }
  .ot__track {
    grid-auto-columns: 78%;
  }
  .ot__shade {
    width: 24px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .ot.is-demo .ot__track,
  .ot.is-demo .ot__nudge,
  .ot.is-demo .ot__state {
    animation: none !important;
    transform: none !important;
  }
  .ot.is-demo .ot__shade--l {
    animation: none !important;
    opacity: 0 !important;
  }
  .ot.is-demo .ot__shade--r {
    animation: none !important;
    opacity: 1 !important;
  }
}

// 옆으로 더 있다고 알려 주는 가장자리 그늘 — scrollLeft/scrollWidth 로 양 끝을 각각 지운다
var ot = document.getElementById('ot');
var view = document.getElementById('ot-view');
var l = document.getElementById('ot-l');
var r = document.getElementById('ot-r');
var state = document.getElementById('ot-state');
view.addEventListener('scroll', function () {
  ot.classList.remove('is-demo');
  var max = view.scrollWidth - view.clientWidth;
  var atLeft = view.scrollLeft <= 4;
  var atRight = view.scrollLeft >= max - 4;
  l.classList.toggle('is-off', atLeft);
  r.classList.toggle('is-off', atRight);
  state.textContent = atRight ? 'You reached the end' : 'More to the side';
});

import { useRef, useState } from "react";
import type { CSSProperties } from "react";
import styles from "./OverflowEdgeHint.module.scss";

export type OverflowEdgeHintProps = {
  title?: string;
  stateMore?: string;
  stateEnd?: string;
  plans?: [string, string, string][];
  note?: string;
  groupLabel?: string;
  tableLabel?: string;
  /** 격자 미리보기용 2초 자동 루프. 사람이 손대면 꺼진다 */
  demo?: boolean;
  duration?: number;
  easing?: string;
  color?: string;
};

type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };
// ambient 가 얇아 DOM 요소 타입을 못 쓴다 — 필요한 꼴만 로컬 타입으로 선언
type ScrollBox = { scrollLeft: number; scrollWidth: number; clientWidth: number };

const DEFAULT_PLANS: [string, string, string][] = [
  ["무료", "0원", "한 명용"],
  ["기본", "9,000원", "다섯 명용"],
  ["팀", "19,000원", "열 명용"],
  ["단체", "39,000원", "제한 없음"],
];

function CaretRightIcon() {
  return <svg viewBox="0 0 256 256" width="1em" height="1em" fill="currentColor" aria-hidden="true"><path d="M176,128,96,208V48Z" opacity="0.2"/><path d="M181.66,122.34l-80-80A8,8,0,0,0,88,48V208a8,8,0,0,0,13.66,5.66l80-80A8,8,0,0,0,181.66,122.34ZM104,188.69V67.31L164.69,128Z"/></svg>;
}

export default function OverflowEdgeHint({
  title = "요금 비교표",
  stateMore = "옆으로 더 있어요",
  stateEnd = "끝까지 왔어요",
  plans = DEFAULT_PLANS,
  note = "양 끝이 흐려진 곳까지가 아직 안 읽은 부분이에요",
  groupLabel = "옆으로 더 있다는 가장자리 알림",
  tableLabel = "요금표 — 좌우로 살펴보기",
  demo = true,
  duration = 2000,
  easing = "ease-out",
  color = "#17141a",
}: OverflowEdgeHintProps) {
  const [atLeft, setAtLeft] = useState(true);
  const [atRight, setAtRight] = useState(false);
  const [live, setLive] = useState(demo);
  const viewRef = useRef<ScrollBox>(null);

  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  // scrollLeft/scrollWidth 로 양 끝을 각각 지운다
  function onScroll() {
    const el = viewRef.current;
    if (!el) return;
    setLive(false);
    const max = el.scrollWidth - el.clientWidth;
    setAtLeft(el.scrollLeft <= 4);
    setAtRight(el.scrollLeft >= max - 4);
  }

  const cls = [styles.ot, live ? styles.isDemo : ""].filter(Boolean).join(" ");

  return (
    <section className={cls} style={vars} aria-label={groupLabel}>
      <header className={styles.head}>
        <p className={styles.otitle}>{title}</p>
        <p className={styles.state}>{atRight ? stateEnd : stateMore}</p>
      </header>
      <div className={styles.view} ref={viewRef} onScroll={onScroll} tabIndex={0} role="region" aria-label={tableLabel}>
        <div className={styles.track}>
          {plans.map(([name, price, who]) => (
            <div className={styles.card} key={name}>
              <b>{name}</b>
              <span>{price}</span>
              <i>{who}</i>
            </div>
          ))}
        </div>
      </div>
      <div className={`${styles.shade} ${styles.shadeL} ${live || !atLeft ? "" : styles.off}`} aria-hidden="true"></div>
      <div className={`${styles.shade} ${styles.shadeR} ${live || !atRight ? "" : styles.off}`} aria-hidden="true">
        <span className={styles.nudge}><CaretRightIcon /></span>
      </div>
      <p className={styles.onote} aria-hidden="true">{note}</p>
    </section>
  );
}