07User menu compacts to avatar

<main class="stage">
  <header class="head is-demo">
    <span class="head__logo">GODRICH</span>
    <div class="head__user">
      <span class="head__name">Alex Kim</span>
      <span class="head__avatar" aria-hidden="true"></span>
    </div>
  </header>
  <div class="page">
    <p class="page__line"></p>
    <p class="page__line"></p>
    <p class="page__line short"></p>
  </div>
</main>

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

// ── 변수 3개. 변형은 이것만 바꾼다 ──────────────────────────
$duration: $dur-base;                              // 이름이 접히는 시간
$easing: $ease-out;
$color: $subject-cream;                            // 아바타 색

// ── 데모 무대 ──────────────────────────────────────────
html, body { margin: 0; overflow: hidden; }
.stage {
  min-height: 100vh;
  margin: 0;
  background: $stage-orange;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.head {
  position: sticky;
  top: 0;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(16px, 5vw, 24px);
  background: $stage-orange;

  &__logo { color: $subject-ink; font-weight: 800; font-size: 18px; line-height: 1; font-family: inherit; letter-spacing: .04em; }   // 주황 헤더 위 글자 — AA 4.5 ($color 크림은 3.11:1)
  &__user { display: flex; align-items: center; }
  &__avatar { width: 32px; height: 32px; border-radius: 50%; background: $color; flex: 0 0 auto; }

  // 폭까지 접어야 아바타가 실제로 왼쪽으로 붙는다 — 텍스트 하나에만 한정
  &__name {
    display: inline-block;
    max-width: 104px;
    margin-right: $sp-2;
    overflow: hidden;
    white-space: nowrap;
    color: $subject-ink;   // 주황 헤더 위 글자 — AA 4.5
    font-weight: 600;
    font-size: 13px;
    line-height: 32px;
    font-family: inherit;
    opacity: 1;
    transform: scaleX(1);
    transform-origin: left; // 규칙8: 이름 텍스트 좌측 기준 접힘
    transition: max-width $duration $easing, margin-right $duration $easing,
                opacity $duration $easing, transform $duration $easing;
  }

  // 실제 사용: 스크롤하면 이름이 접히고 아바타만 남는다
  &.is-scrolled &__name { max-width: 0; margin-right: 0; opacity: 0; transform: scaleX(0); }
}

// ── 데모(.is-demo): 이름이 접혔다 펼쳐졌다 2초 루프 ──────
.head.is-demo .head__name {
  animation: name-collapse $dur-loop $easing infinite;
}
@keyframes name-collapse {
  0%, 15%   { max-width: 104px; margin-right: $sp-2; opacity: 1; transform: scaleX(1); }
  45%, 70%  { max-width: 0; margin-right: 0; opacity: 0; transform: scaleX(0); }
  95%, 100% { max-width: 104px; margin-right: $sp-2; opacity: 1; transform: scaleX(1); }
}

// ── 배경: 문서처럼 보이는 자리 ─────────────────────────
.page { padding: $sp-6 $sp-6 0; }
.page__line {
  height: 12px;
  margin: 0 0 $sp-3;
  border-radius: $r-xs;
  background: rgba($stage-paper, .28);
  &.short { width: 60%; }
}

// ── 접근성: 움직임 줄이기 설정이면 즉시 상태만 바뀐다 ────────
@media (prefers-reduced-motion: reduce) {
  .head__name { transition: none; }
  .head.is-demo .head__name { animation: none !important; max-width: 104px; margin-right: $sp-2; opacity: 1; transform: scaleX(1); }
}

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

.stage {
  min-height: 100vh;
  margin: 0;
  background: #ff4d1f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.head {
  position: sticky;
  top: 0;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(16px, 5vw, 24px);
  background: #ff4d1f;
}
.head__logo {
  color: #17141a;
  font-weight: 800;
  font-size: 18px;
  line-height: 1;
  font-family: inherit;
  letter-spacing: 0.04em;
}
.head__user {
  display: flex;
  align-items: center;
}
.head__avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: #fff7e6;
  flex: 0 0 auto;
}
.head__name {
  display: inline-block;
  max-width: 104px;
  margin-right: 8px;
  overflow: hidden;
  white-space: nowrap;
  color: #17141a;
  font-weight: 600;
  font-size: 13px;
  line-height: 32px;
  font-family: inherit;
  opacity: 1;
  transform: scaleX(1);
  transform-origin: left;
  transition: max-width 300ms ease-out, margin-right 300ms ease-out, opacity 300ms ease-out, transform 300ms ease-out;
}
.head.is-scrolled .head__name {
  max-width: 0;
  margin-right: 0;
  opacity: 0;
  transform: scaleX(0);
}

.head.is-demo .head__name {
  animation: name-collapse 2s ease-out infinite;
}

@keyframes name-collapse {
  0%, 15% {
    max-width: 104px;
    margin-right: 8px;
    opacity: 1;
    transform: scaleX(1);
  }
  45%, 70% {
    max-width: 0;
    margin-right: 0;
    opacity: 0;
    transform: scaleX(0);
  }
  95%, 100% {
    max-width: 104px;
    margin-right: 8px;
    opacity: 1;
    transform: scaleX(1);
  }
}
.page {
  padding: 24px 24px 0;
}

.page__line {
  height: 12px;
  margin: 0 0 12px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.28);
}
.page__line.short {
  width: 60%;
}

@media (prefers-reduced-motion: reduce) {
  .head__name {
    transition: none;
  }
  .head.is-demo .head__name {
    animation: none !important;
    max-width: 104px;
    margin-right: 8px;
    opacity: 1;
    transform: scaleX(1);
  }
}

// 실제 페이지: 스크롤을 40px 넘게 내리면 사용자 이름이 접히고 아바타만 남는다 (7줄)
var head = document.querySelector('.head');
window.addEventListener('scroll', function () {
  head.classList.toggle('is-scrolled', window.scrollY > 40);
}, { passive: true });

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

export type UserMenuHeaderProps = {
  logo: string;
  name: string;
  /** 이름이 접히는 시간 (기본 300ms) */
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function UserMenuHeader({
  logo,
  name,
  duration = 300,
  easing = "ease-out",
  color = "#fff7e6",
}: UserMenuHeaderProps) {
  const [scrolled, setScrolled] = useState(false);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  useEffect(() => {
    function onScroll() {
      setScrolled(window.scrollY > 40);
    }
    window.addEventListener("scroll", onScroll, { passive: true });
    return () => window.removeEventListener("scroll", onScroll);
  }, []);

  return (
    <header className={styles.head} style={vars}>
      <span className={styles.logo}>{logo}</span>
      <div className={styles.user}>
        <span className={scrolled ? `${styles.name} ${styles.collapsed}` : styles.name}>
          {name}
        </span>
        <span className={styles.avatar} aria-hidden="true" />
      </div>
    </header>
  );
}