02Floating side share rail

<div class="stage">
  <div class="sr">
    <div class="sr__view">
      <div class="sr__doc">

        <nav class="sr__rail" aria-label="Share rail">
          <a class="sr__link" href="#">
            <span class="sr__ic"><svg width="20" height="20" aria-hidden="true" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 256" fill="currentColor"><path d="M218.34,119.6,183.6,154.34a46.58,46.58,0,0,1-44.31,12.26c-.31.34-.62.67-.95,1L103.6,202.34A46.63,46.63,0,1,1,37.66,136.4L72.4,101.66A46.6,46.6,0,0,1,116.71,89.4c.31-.34.62-.67,1-1L152.4,53.66a46.63,46.63,0,0,1,65.94,65.94Z" opacity="0.2"/><path d="M240,88.23a54.43,54.43,0,0,1-16,37L189.25,160a54.27,54.27,0,0,1-38.63,16h-.05A54.63,54.63,0,0,1,96,119.84a8,8,0,0,1,16,.45A38.62,38.62,0,0,0,150.58,160h0a38.39,38.39,0,0,0,27.31-11.31l34.75-34.75a38.63,38.63,0,0,0-54.63-54.63l-11,11A8,8,0,0,1,135.7,59l11-11A54.65,54.65,0,0,1,224,48,54.86,54.86,0,0,1,240,88.23ZM109,185.66l-11,11A38.41,38.41,0,0,1,70.6,208h0a38.63,38.63,0,0,1-27.29-65.94L78,107.31A38.63,38.63,0,0,1,144,135.71a8,8,0,0,0,7.78,8.22H152a8,8,0,0,0,8-7.78A54.86,54.86,0,0,0,144,96a54.65,54.65,0,0,0-77.27,0L32,130.75A54.62,54.62,0,0,0,70.56,224h0a54.28,54.28,0,0,0,38.64-16l11-11A8,8,0,0,0,109,185.66Z"/></svg></span>
            <span class="sr__name">Copy link</span>
          </a>
          <a class="sr__link" href="#">
            <span class="sr__ic"><svg width="20" height="20" aria-hidden="true" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 256" fill="currentColor"><path d="M224,56l-96,88L32,56Z" opacity="0.2"/><path d="M224,48H32a8,8,0,0,0-8,8V192a16,16,0,0,0,16,16H216a16,16,0,0,0,16-16V56A8,8,0,0,0,224,48ZM203.43,64,128,133.15,52.57,64ZM216,192H40V74.19l82.59,75.71a8,8,0,0,0,10.82,0L216,74.19V192Z"/></svg></span>
            <span class="sr__name">Send mail</span>
          </a>
          <a class="sr__link" href="#">
            <span class="sr__ic"><svg width="20" height="20" aria-hidden="true" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 256" fill="currentColor"><path d="M224,128A96,96,0,0,1,79.93,211.11h0L42.54,223.58a8,8,0,0,1-10.12-10.12l12.47-37.39h0A96,96,0,1,1,224,128Z" opacity="0.2"/><path d="M128,24A104,104,0,0,0,36.18,176.88L24.83,210.93a16,16,0,0,0,20.24,20.24l34.05-11.35A104,104,0,1,0,128,24Zm0,192a87.87,87.87,0,0,1-44.06-11.81,8,8,0,0,0-4-1.08,7.85,7.85,0,0,0-2.53.42L40,216,52.47,178.6a8,8,0,0,0-.66-6.54A88,88,0,1,1,128,216Zm12-88a12,12,0,1,1-12-12A12,12,0,0,1,140,128Zm-44,0a12,12,0,1,1-12-12A12,12,0,0,1,96,128Zm88,0a12,12,0,1,1-12-12A12,12,0,0,1,184,128Z"/></svg></span>
            <span class="sr__name">Message</span>
          </a>
          <a class="sr__link" href="#">
            <span class="sr__ic"><svg width="20" height="20" aria-hidden="true" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 256" fill="currentColor"><path d="M208,200a32,32,0,1,1-32-32A32,32,0,0,1,208,200ZM176,88a32,32,0,1,0-32-32A32,32,0,0,0,176,88Z" opacity="0.2"/><path d="M176,160a39.89,39.89,0,0,0-28.62,12.09l-46.1-29.63a39.8,39.8,0,0,0,0-28.92l46.1-29.63a40,40,0,1,0-8.66-13.45l-46.1,29.63a40,40,0,1,0,0,55.82l46.1,29.63A40,40,0,1,0,176,160Zm0-128a24,24,0,1,1-24,24A24,24,0,0,1,176,32ZM64,152a24,24,0,1,1,24-24A24,24,0,0,1,64,152Zm112,72a24,24,0,1,1,24-24A24,24,0,0,1,176,224Z"/></svg></span>
            <span class="sr__name">More</span>
          </a>
        </nav>

        <article class="sr__body">
          <h2 class="sr__title">Long reads get shared from the side</h2>
          <span class="sr__row sr__row--full" aria-hidden="true"></span>
          <span class="sr__row sr__row--wide" aria-hidden="true"></span>
          <span class="sr__row sr__row--mid" aria-hidden="true"></span>
          <span class="sr__row sr__row--full" aria-hidden="true"></span>
          <span class="sr__row sr__row--wide" aria-hidden="true"></span>
          <span class="sr__row sr__row--short" aria-hidden="true"></span>
          <span class="sr__row sr__row--full" aria-hidden="true"></span>
          <span class="sr__row sr__row--mid" aria-hidden="true"></span>
        </article>

      </div>
    </div>
  </div>
</div>

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

// 편 277 공유 팔레트 (01 과 같은 값)
$sh-ink:   #15131a;
$sh-ink2:  #26232e;
$sh-paper: #ffffff;
$sh-cream: #fdf8f0;
$sh-slate: #5b5566;
$sh-mist:  #bdb7c6;   // 잉크 위 보조 글자 9.43:1
$sh-sky:   #c8dce4;   // 잉크 위 강조 11.09:1
$sh-deep:  #477690;

$duration: $dur-loop;      // 넷이 차례로 라벨을 펼치는 한 바퀴
$easing:   $ease-spring;
$color:    $sh-sky;        // 펼쳐진 라벨 면 색

@include stage($sh-ink);

.sr {
  box-sizing: border-box;
  width: clamp(288px, 88vw, 400px);
  height: 216px;
  overflow: hidden;
  border-radius: $r-card;
  background: $sh-ink2;
  box-shadow: $shadow-raised;
}

.sr__view {
  height: 100%;
  overflow-y: auto;
  overscroll-behavior: contain;
}

// 화면보다 긴 문서 — 이 높이 차이가 sticky 가 걸릴 여유다.
// 여유를 padding-bottom 으로 주면 sticky 유효 범위(부모 콘텐츠 박스) 밖이라 안 먹는다
.sr__doc {
  display: grid;
  // 펼친 라벨이 본문 글자를 덮지 않게 첫 칸을 펼친 폭(136px)으로 미리 잡는다 —
  // 접힌 폭(44px)으로 잡으면 펼치는 순간 라벨이 제목 위에 얹힌다 (첫 렌더 실측)
  grid-template-columns: 136px 1fr;
  gap: $sp-3;
  min-height: 300px;
  padding: $sp-3;
}

.sr__rail {
  position: sticky;
  top: 0;
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: $sp-2;
}

.sr__link {
  position: relative;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  gap: $sp-2;
  // 펼친 폭(136px)만큼 상자를 미리 잡아 두고 오른쪽 100px 을 잘라 둔다 —
  // 라벨 첫 글자는 여백 12px + 아이콘 20px + 간격 8px 인 40px 에서 시작하는데
  // 남는 36px 이 그보다 안쪽이라 접힌 상태에 라벨 글자가 안 비친다
  // (첫 렌더 실측: 92px 로 자르니 남는 44px 이 40px 을 넘어 첫 글자가 비쳤다)
  // 펼침은 폭을 늘리는 게 아니라 가려 둔 면을 드러내는 것이라 레이아웃이 다시 계산되지 않는다
  width: 136px;
  height: 44px;
  padding: 0 $sp-3;
  border-radius: $r-pill;
  background: $sh-ink;
  color: $sh-mist;
  text-decoration: none;
  clip-path: inset(0 100px 0 0 round $r-pill);
  transition: clip-path $dur-base $easing, background-color $dur-base $easing, color $dur-base $easing;
}

.sr__ic {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 20px;
}
.sr__ic svg { display: block; }

.sr__name {
  white-space: nowrap;
  font-weight: 600; font-size: 12px; line-height: 1;
  font-family: inherit;
}

// 손으로 쓰는 경로 — .is-demo 를 뗀 뒤에도 라벨이 펼쳐진다
.sr__link:hover,
.sr__link:focus-visible {
  clip-path: inset(0 0 0 0 round $r-pill);
  background: $color;
  color: $sh-ink;               // 하늘색 면 위 잉크 글자 11.09:1
}
.sr__link:focus-visible {
  outline: 2px solid $sh-paper;
  outline-offset: 2px;
}

.sr__body {
  display: flex;
  flex-direction: column;
  gap: $sp-2;
}

.sr__title {
  margin: 0;
  color: $sh-paper;
  font-weight: 700; font-size: 14px; line-height: 1.3;
  font-family: inherit;
}

.sr__row {
  display: block;
  height: 8px;
  border-radius: $r-pill;
  background: #3b3746;
}
.sr__row--full  { width: 100%; }
.sr__row--wide  { width: 84%; }
.sr__row--mid   { width: 64%; }
.sr__row--short { width: 42%; }

// ── 자동 재생 ───────────────────────────────────────────────
// 넷이 0.16초씩 밀려 펼쳐진다. animation 단축은 delay 를 0 으로 리셋하므로 낱개 속성으로,
// 지연 구간에 접힌 기본 상태가 번쩍이지 않게 fill-mode: backwards 를 같이 준다
.is-demo .sr__link {
  animation-name: railUnfold;
  animation-duration: $duration;
  animation-timing-function: $easing;
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}
.is-demo .sr__link:nth-child(1) { animation-delay: 0s; }
.is-demo .sr__link:nth-child(2) { animation-delay: .16s; }
.is-demo .sr__link:nth-child(3) { animation-delay: .32s; }
.is-demo .sr__link:nth-child(4) { animation-delay: .48s; }

// 펼침 10% · 접힘 16% 의 비대칭. 복귀는 90% 안에 끝난다 — 24프레임의 마지막 장이 95.8% 지점이다.
// clip-path 는 이징으로 보간되는 속성이라 steps 와 섞지 않는다
@keyframes railUnfold {
  0%        { clip-path: inset(0 100px 0 0 round $r-pill); background-color: $sh-ink;  color: $sh-mist; }
  10%, 46%  { clip-path: inset(0 0 0 0 round $r-pill);    background-color: $color;   color: $sh-ink; }
  62%, 100% { clip-path: inset(0 100px 0 0 round $r-pill); background-color: $sh-ink;  color: $sh-mist; }
}

@media (max-width: 340px), (max-height: 220px) {
  .sr { height: 156px; }
  .sr__doc { grid-template-columns: 124px 1fr; gap: $sp-2; min-height: 216px; padding: $sp-2; }
  .sr__rail { gap: $sp-1; }
  .sr__link { width: 124px; height: 40px; padding: 0 $sp-2; clip-path: inset(0 92px 0 0 round $r-pill); }
  .sr__title { font-size: 13px; }
  .sr__row { height: 6px; }
  .sr__ic svg { width: 18px; height: 18px; }
}

@media (prefers-reduced-motion: reduce) {
  // .is-demo 쪽 선택자가 (0,2,0) 이라 !important 없이는 진다
  .is-demo .sr__link { animation: none !important; }
  .sr__link { transition: none !important; }
  // 움직임을 끊어도 호버·초점의 펼침은 그대로 남는다
  .sr__link:hover, .sr__link:focus-visible { clip-path: inset(0 0 0 0 round $r-pill); }
}

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #15131a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.sr {
  box-sizing: border-box;
  width: clamp(288px, 88vw, 400px);
  height: 216px;
  overflow: hidden;
  border-radius: 16px;
  background: #26232e;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}

.sr__view {
  height: 100%;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.sr__doc {
  display: grid;
  grid-template-columns: 136px 1fr;
  gap: 12px;
  min-height: 300px;
  padding: 12px;
}

.sr__rail {
  position: sticky;
  top: 0;
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sr__link {
  position: relative;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  gap: 8px;
  width: 136px;
  height: 44px;
  padding: 0 12px;
  border-radius: 999px;
  background: #15131a;
  color: #bdb7c6;
  text-decoration: none;
  clip-path: inset(0 100px 0 0 round 999px);
  transition: clip-path 300ms cubic-bezier(0.2, 0.8, 0.2, 1), background-color 300ms cubic-bezier(0.2, 0.8, 0.2, 1), color 300ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.sr__ic {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 20px;
}

.sr__ic svg {
  display: block;
}

.sr__name {
  white-space: nowrap;
  font-weight: 600;
  font-size: 12px;
  line-height: 1;
  font-family: inherit;
}

.sr__link:hover,
.sr__link:focus-visible {
  clip-path: inset(0 0 0 0 round 999px);
  background: #c8dce4;
  color: #15131a;
}

.sr__link:focus-visible {
  outline: 2px solid #ffffff;
  outline-offset: 2px;
}

.sr__body {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sr__title {
  margin: 0;
  color: #ffffff;
  font-weight: 700;
  font-size: 14px;
  line-height: 1.3;
  font-family: inherit;
}

.sr__row {
  display: block;
  height: 8px;
  border-radius: 999px;
  background: #3b3746;
}

.sr__row--full {
  width: 100%;
}

.sr__row--wide {
  width: 84%;
}

.sr__row--mid {
  width: 64%;
}

.sr__row--short {
  width: 42%;
}

.is-demo .sr__link {
  animation-name: railUnfold;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}

.is-demo .sr__link:nth-child(1) {
  animation-delay: 0s;
}

.is-demo .sr__link:nth-child(2) {
  animation-delay: 0.16s;
}

.is-demo .sr__link:nth-child(3) {
  animation-delay: 0.32s;
}

.is-demo .sr__link:nth-child(4) {
  animation-delay: 0.48s;
}

@keyframes railUnfold {
  0% {
    clip-path: inset(0 100px 0 0 round 999px);
    background-color: #15131a;
    color: #bdb7c6;
  }
  10%, 46% {
    clip-path: inset(0 0 0 0 round 999px);
    background-color: #c8dce4;
    color: #15131a;
  }
  62%, 100% {
    clip-path: inset(0 100px 0 0 round 999px);
    background-color: #15131a;
    color: #bdb7c6;
  }
}
@media (max-width: 340px), (max-height: 220px) {
  .sr {
    height: 156px;
  }
  .sr__doc {
    grid-template-columns: 124px 1fr;
    gap: 8px;
    min-height: 216px;
    padding: 8px;
  }
  .sr__rail {
    gap: 4px;
  }
  .sr__link {
    width: 124px;
    height: 40px;
    padding: 0 8px;
    clip-path: inset(0 92px 0 0 round 999px);
  }
  .sr__title {
    font-size: 13px;
  }
  .sr__row {
    height: 6px;
  }
  .sr__ic svg {
    width: 18px;
    height: 18px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .is-demo .sr__link {
    animation: none !important;
  }
  .sr__link {
    transition: none !important;
  }
  .sr__link:hover, .sr__link:focus-visible {
    clip-path: inset(0 0 0 0 round 999px);
  }
}

(function () {
  var body = document.body;

  function hand() { body.classList.remove('is-demo'); }   // 사람이 손을 대면 자동 재생을 끈다

  document.querySelectorAll('.sr__link').forEach(function (a) {
    a.addEventListener('pointerdown', hand);
    a.addEventListener('focusin', hand);
    a.addEventListener('click', function (e) { e.preventDefault(); hand(); });
  });
  document.querySelector('.sr__view').addEventListener('scroll', hand);
})();

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

/* ambient 에 React 의 이벤트 제네릭이 없어 필요한 것만 로컬로 선언한다 */
type ClickEvt = { preventDefault(): void };

export type ShareSideRailProps = {
  /** 바에 서는 공유 방법 이름 */
  labels?: string[];
  /** 넷이 차례로 라벨을 펼치는 한 바퀴(ms) */
  duration?: number;
  easing?: string;
  /** 펼쳐진 라벨 면 색 */
  color?: string;
  autoPlay?: boolean;
};

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

/* Phosphor Duotone (MIT) — 사슬 · 봉투 · 말풍선 · 공유 */
const ICONS: ReactNode[] = [
  <svg width="20" height="20" aria-hidden="true" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 256" fill="currentColor"><path d="M218.34,119.6,183.6,154.34a46.58,46.58,0,0,1-44.31,12.26c-.31.34-.62.67-.95,1L103.6,202.34A46.63,46.63,0,1,1,37.66,136.4L72.4,101.66A46.6,46.6,0,0,1,116.71,89.4c.31-.34.62-.67,1-1L152.4,53.66a46.63,46.63,0,0,1,65.94,65.94Z" opacity="0.2"/><path d="M240,88.23a54.43,54.43,0,0,1-16,37L189.25,160a54.27,54.27,0,0,1-38.63,16h-.05A54.63,54.63,0,0,1,96,119.84a8,8,0,0,1,16,.45A38.62,38.62,0,0,0,150.58,160h0a38.39,38.39,0,0,0,27.31-11.31l34.75-34.75a38.63,38.63,0,0,0-54.63-54.63l-11,11A8,8,0,0,1,135.7,59l11-11A54.65,54.65,0,0,1,224,48,54.86,54.86,0,0,1,240,88.23ZM109,185.66l-11,11A38.41,38.41,0,0,1,70.6,208h0a38.63,38.63,0,0,1-27.29-65.94L78,107.31A38.63,38.63,0,0,1,144,135.71a8,8,0,0,0,7.78,8.22H152a8,8,0,0,0,8-7.78A54.86,54.86,0,0,0,144,96a54.65,54.65,0,0,0-77.27,0L32,130.75A54.62,54.62,0,0,0,70.56,224h0a54.28,54.28,0,0,0,38.64-16l11-11A8,8,0,0,0,109,185.66Z"/></svg>,
  <svg width="20" height="20" aria-hidden="true" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 256" fill="currentColor"><path d="M224,56l-96,88L32,56Z" opacity="0.2"/><path d="M224,48H32a8,8,0,0,0-8,8V192a16,16,0,0,0,16,16H216a16,16,0,0,0,16-16V56A8,8,0,0,0,224,48ZM203.43,64,128,133.15,52.57,64ZM216,192H40V74.19l82.59,75.71a8,8,0,0,0,10.82,0L216,74.19V192Z"/></svg>,
  <svg width="20" height="20" aria-hidden="true" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 256" fill="currentColor"><path d="M224,128A96,96,0,0,1,79.93,211.11h0L42.54,223.58a8,8,0,0,1-10.12-10.12l12.47-37.39h0A96,96,0,1,1,224,128Z" opacity="0.2"/><path d="M128,24A104,104,0,0,0,36.18,176.88L24.83,210.93a16,16,0,0,0,20.24,20.24l34.05-11.35A104,104,0,1,0,128,24Zm0,192a87.87,87.87,0,0,1-44.06-11.81,8,8,0,0,0-4-1.08,7.85,7.85,0,0,0-2.53.42L40,216,52.47,178.6a8,8,0,0,0-.66-6.54A88,88,0,1,1,128,216Zm12-88a12,12,0,1,1-12-12A12,12,0,0,1,140,128Zm-44,0a12,12,0,1,1-12-12A12,12,0,0,1,96,128Zm88,0a12,12,0,1,1-12-12A12,12,0,0,1,184,128Z"/></svg>,
  <svg width="20" height="20" aria-hidden="true" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 256" fill="currentColor"><path d="M208,200a32,32,0,1,1-32-32A32,32,0,0,1,208,200ZM176,88a32,32,0,1,0-32-32A32,32,0,0,0,176,88Z" opacity="0.2"/><path d="M176,160a39.89,39.89,0,0,0-28.62,12.09l-46.1-29.63a39.8,39.8,0,0,0,0-28.92l46.1-29.63a40,40,0,1,0-8.66-13.45l-46.1,29.63a40,40,0,1,0,0,55.82l46.1,29.63A40,40,0,1,0,176,160Zm0-128a24,24,0,1,1-24,24A24,24,0,0,1,176,32ZM64,152a24,24,0,1,1,24-24A24,24,0,0,1,64,152Zm112,72a24,24,0,1,1,24-24A24,24,0,0,1,176,224Z"/></svg>,
];

const ROWS = ["rowFull", "rowWide", "rowMid", "rowFull", "rowWide", "rowShort", "rowFull", "rowMid"];

export default function ShareSideRail({
  labels = ["링크 복사", "메일 보내기", "메시지", "더 보기"],
  duration = 2000,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#7fd4f5",
  autoPlay = true,
}: ShareSideRailProps) {
  const [demo, setDemo] = useState(autoPlay);

  /* 사람이 손을 대면 자동 재생을 끈다 */
  function stopDemo() {
    setDemo(false);
  }

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

  return (
    <div className={styles.stage + (demo ? " " + styles.isDemo : "")} style={vars}>
      <div className={styles.wrap}>
        <div className={styles.view} onScroll={stopDemo}>
          <div className={styles.doc}>
            <nav className={styles.rail} aria-label="공유 바">
              {labels.map((name, i) => (
                <a
                  key={name}
                  className={styles.link}
                  href="#"
                  onClick={(e: ClickEvt) => {
                    e.preventDefault();
                    stopDemo();
                  }}
                  onPointerDown={stopDemo}
                  onFocus={stopDemo}
                >
                  <span className={styles.ic}>{ICONS[i]}</span>
                  <span className={styles.name}>{name}</span>
                </a>
              ))}
            </nav>

            <article className={styles.body}>
              <h2 className={styles.title}>긴 글은 옆에서 공유한다</h2>
              {ROWS.map((cls, i) => (
                <span key={i} className={styles.row + " " + styles[cls]} aria-hidden="true" />
              ))}
            </article>
          </div>
        </div>
      </div>
    </div>
  );
}