02押し込みナビインジケーター

<main class="stage">
  <nav class="navneu">
    <span class="navneu__brand">Neumo</span>
    <div class="navneu__track is-demo">
      <span class="navneu__indicator" aria-hidden="true"></span>
      <span class="navneu__item">ホーム</span>
      <span class="navneu__item">機能</span>
      <span class="navneu__item">料金プラン</span>
      <span class="navneu__item">お問い合わせ</span>
    </div>
    <button class="navneu__cta" type="button">はじめる</button>
  </nav>
</main>

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

$duration: $dur-loop;       // 인디케이터가 4칸을 한 바퀴 도는 시간
$easing: $ease-spring;      // 미끄러지는 곡선
$color: $subject-blue;      // 강조 색

@include stage($stage-yellow);

$neu-surface: mix($stage-yellow, black, 94%);
$neu-light: rgba(mix($neu-surface, white, 40%), .6);
$neu-dark: rgba(mix($neu-surface, black, 40%), .35);

.navneu {
  box-sizing: border-box;
  width: clamp(260px, 84vw, 400px);
  display: flex;
  align-items: center;
  gap: $sp-3;
  border-radius: $r-pill;
  background: $neu-surface;
  padding: $sp-2;
  box-shadow: 7px 7px 14px $neu-dark, -7px -7px 14px $neu-light;
}
.navneu__brand {
  padding-left: $sp-2;
  color: $subject-ink;
  font-weight: 800; font-size: clamp(11px, 2.8vw, 13px); line-height: 1;
  white-space: nowrap;
}
.navneu__track {
  position: relative;
  flex: 1;
  display: flex;
  border-radius: $r-pill;
  background: $neu-surface;
  padding: $sp-1;
  // 눌린 트랙 — 안쪽으로 파인 뉴모피즘 인셋 그림자
  box-shadow: inset 3px 3px 6px $neu-dark, inset -3px -3px 6px $neu-light;
}
.navneu__indicator {
  position: absolute;
  top: $sp-1;
  bottom: $sp-1;
  left: $sp-1;
  width: calc((100% - #{$sp-1} * 2) / 4);
  border-radius: $r-pill;
  background: $neu-surface;
  // 인디케이터만 볼록하게 — 트랙(오목)과 대비되는 유일한 볼록 표면
  box-shadow: 3px 3px 6px $neu-dark, -3px -3px 6px $neu-light;
  animation: navSlide $duration $easing infinite;
}
.navneu__item {
  position: relative;
  z-index: 1;
  flex: 1;
  text-align: center;
  padding: $sp-2 0;
  color: $subject-ink;
  font-weight: 600; font-size: clamp(10.5px, 2.6vw, 12px); line-height: 1;
}
.navneu__cta {
  border: 0;
  border-radius: $r-pill;
  background: $neu-surface;
  color: $subject-ink;
  padding: $sp-2 $sp-4;
  font-weight: 700; font-size: clamp(10.5px, 2.6vw, 12px); line-height: 1;
  white-space: nowrap;
  box-shadow: 4px 4px 8px $neu-dark, -4px -4px 8px $neu-light;
}
.navneu__cta:focus-visible {
  outline: 3px solid $color;
  outline-offset: 2px;
}

// 데모: 캡슐 안 인디케이터가 4칸을 순서대로 돈다. width 25% 이므로 translateX(100%) = 제 폭만큼 = 한 칸
@keyframes navSlide {
  0%, 15%  { transform: translateX(0%); }
  25%, 40% { transform: translateX(100%); }
  50%, 65% { transform: translateX(200%); }
  75%, 90% { transform: translateX(300%); }
  100%     { transform: translateX(0%); }
}

@media (prefers-reduced-motion: reduce) {
  .navneu__indicator { animation: none !important; transform: translateX(0%); }
}

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);
}

.navneu {
  box-sizing: border-box;
  width: clamp(260px, 84vw, 400px);
  display: flex;
  align-items: center;
  gap: 12px;
  border-radius: 999px;
  background: rgb(94%, 77.4117647059%, 23.2235294118%);
  padding: 8px;
  box-shadow: 7px 7px 14px rgba(37.6%, 30.9647058824%, 9.2894117647%, 0.35), -7px -7px 14px rgba(97.6%, 90.9647058824%, 69.2894117647%, 0.6);
}

.navneu__brand {
  padding-left: 8px;
  color: #17141a;
  font-weight: 800;
  font-size: clamp(11px, 2.8vw, 13px);
  line-height: 1;
  white-space: nowrap;
}

.navneu__track {
  position: relative;
  flex: 1;
  display: flex;
  border-radius: 999px;
  background: rgb(94%, 77.4117647059%, 23.2235294118%);
  padding: 4px;
  box-shadow: inset 3px 3px 6px rgba(37.6%, 30.9647058824%, 9.2894117647%, 0.35), inset -3px -3px 6px rgba(97.6%, 90.9647058824%, 69.2894117647%, 0.6);
}

.navneu__indicator {
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: 4px;
  width: calc((100% - 4px * 2) / 4);
  border-radius: 999px;
  background: rgb(94%, 77.4117647059%, 23.2235294118%);
  box-shadow: 3px 3px 6px rgba(37.6%, 30.9647058824%, 9.2894117647%, 0.35), -3px -3px 6px rgba(97.6%, 90.9647058824%, 69.2894117647%, 0.6);
  animation: navSlide 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.navneu__item {
  position: relative;
  z-index: 1;
  flex: 1;
  text-align: center;
  padding: 8px 0;
  color: #17141a;
  font-weight: 600;
  font-size: clamp(10.5px, 2.6vw, 12px);
  line-height: 1;
}

.navneu__cta {
  border: 0;
  border-radius: 999px;
  background: rgb(94%, 77.4117647059%, 23.2235294118%);
  color: #17141a;
  padding: 8px 16px;
  font-weight: 700;
  font-size: clamp(10.5px, 2.6vw, 12px);
  line-height: 1;
  white-space: nowrap;
  box-shadow: 4px 4px 8px rgba(37.6%, 30.9647058824%, 9.2894117647%, 0.35), -4px -4px 8px rgba(97.6%, 90.9647058824%, 69.2894117647%, 0.6);
}

.navneu__cta:focus-visible {
  outline: 3px solid #2f6df6;
  outline-offset: 2px;
}

@keyframes navSlide {
  0%, 15% {
    transform: translateX(0%);
  }
  25%, 40% {
    transform: translateX(100%);
  }
  50%, 65% {
    transform: translateX(200%);
  }
  75%, 90% {
    transform: translateX(300%);
  }
  100% {
    transform: translateX(0%);
  }
}
@media (prefers-reduced-motion: reduce) {
  .navneu__indicator {
    animation: none !important;
    transform: translateX(0%);
  }
}

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

export type NavNeuProps = {
  brand?: string;
  items?: string[];
  cta?: string;
  /** 인디케이터가 항목 전부를 한 바퀴 도는 시간(기본 2000ms) */
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function NavNeu({
  brand = "Neumo",
  items = ["홈", "기능", "요금제", "문의"],
  cta = "시작하기",
  duration = 2000,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#2f6df6",
}: NavNeuProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  return (
    <nav className={styles.nav} style={vars}>
      <span className={styles.brand}>{brand}</span>
      <div className={styles.track}>
        <span className={styles.indicator} aria-hidden="true" style={{ width: `calc((100% - 8px) / ${items.length})` }} />
        {items.map((label) => (
          <span key={label} className={styles.item}>{label}</span>
        ))}
      </div>
      <button type="button" className={styles.cta}>{cta}</button>
    </nav>
  );
}