02Capsule nav

<main class="stage">
  <nav class="navclay is-demo">
    <span class="navclay__brand">Claymolt</span>
    <div class="navclay__menu">
      <span class="navclay__indicator" aria-hidden="true"></span>
      <span class="navclay__item">Home</span>
      <span class="navclay__item">Features</span>
      <span class="navclay__item">Pricing</span>
      <span class="navclay__item">Contact</span>
    </div>
    <button class="navclay__cta" type="button">Get started</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-ink;       // 강조 색 (노랑 무대라 먹색으로 대비)

@include stage($stage-yellow);

.navclay {
  box-sizing: border-box;
  width: clamp(260px, 84vw, 400px);
  display: flex;
  align-items: center;
  gap: $sp-3;
  border-radius: $r-pill;
  background: $subject-cream;
  padding: $sp-2;
  box-shadow: 6px 6px 14px rgba($stage-ink, .22), -6px -6px 14px rgba($stage-paper, .6);
}
.navclay__brand {
  padding-left: $sp-2;
  color: $color;
  font-weight: 800; font-size: clamp(11px, 2.8vw, 13px); line-height: 1;
  white-space: nowrap;
}
.navclay__menu {
  position: relative;
  flex: 1;
  display: flex;
  border-radius: $r-pill;
  background: rgba($stage-ink, .06);
  padding: $sp-1;
  box-shadow: inset 3px 3px 6px rgba($stage-ink, .18), inset -3px -3px 6px rgba($stage-paper, .55);
}
.navclay__indicator {
  position: absolute;
  top: $sp-1;
  bottom: $sp-1;
  left: $sp-1;
  // 실측 함정: width:25% 는 절대배치 기준 박스(.navclay__menu 의 padding box, 208px)로 계산되는데
  // 실제 항목 4개는 그 안쪽 content box(200px, 부모 padding 8px 뺀 값)로 나뉜다 — 인디케이터가 항목보다
  // 정확히 2px씩 넓어져 translateX(100%) 마다 어긋남이 누적됐다(1→3→5→7px 실측). 같은 content box 기준으로 계산
  width: calc((100% - #{$sp-1} * 2) / 4);
  border-radius: $r-pill;
  // 밝은 캡슐로 둔다 — 먹색이면 먹색 글자와 겹칠 때 라벨이 안 보인다 (실측: 정적 스크린샷에서 "홈" 소실)
  background: $subject-cream;
  box-shadow: 2px 2px 6px rgba($stage-ink, .25), inset 1px 1px 0 rgba($stage-paper, .6);
  animation: navSlide $duration $easing infinite;
}
.navclay__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;
}
.navclay__cta {
  border: 0;
  border-radius: $r-pill;
  background: $color;
  color: $subject-cream;
  padding: $sp-2 $sp-4;
  font-weight: 700; font-size: clamp(10.5px, 2.6vw, 12px); line-height: 1;
  white-space: nowrap;
}

// 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) {
  .navclay__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);
}

.navclay {
  box-sizing: border-box;
  width: clamp(260px, 84vw, 400px);
  display: flex;
  align-items: center;
  gap: 12px;
  border-radius: 999px;
  background: #fff7e6;
  padding: 8px;
  box-shadow: 6px 6px 14px rgba(23, 20, 26, 0.22), -6px -6px 14px rgba(255, 255, 255, 0.6);
}

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

.navclay__menu {
  position: relative;
  flex: 1;
  display: flex;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.06);
  padding: 4px;
  box-shadow: inset 3px 3px 6px rgba(23, 20, 26, 0.18), inset -3px -3px 6px rgba(255, 255, 255, 0.55);
}

.navclay__indicator {
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: 4px;
  width: calc((100% - 4px * 2) / 4);
  border-radius: 999px;
  background: #fff7e6;
  box-shadow: 2px 2px 6px rgba(23, 20, 26, 0.25), inset 1px 1px 0 rgba(255, 255, 255, 0.6);
  animation: navSlide 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.navclay__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;
}

.navclay__cta {
  border: 0;
  border-radius: 999px;
  background: #17141a;
  color: #fff7e6;
  padding: 8px 16px;
  font-weight: 700;
  font-size: clamp(10.5px, 2.6vw, 12px);
  line-height: 1;
  white-space: nowrap;
}

@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) {
  .navclay__indicator {
    animation: none !important;
    transform: translateX(0%);
  }
}

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

export type NavClayProps = {
  brand?: string;
  items?: string[];
  cta?: string;
  activeIndex?: number;
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function NavClay({
  brand = "Claymolt",
  items = ["홈", "기능", "요금제", "문의"],
  cta = "시작하기",
  activeIndex,
  duration = 2000,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#17141a",
}: NavClayProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  const indicatorStyle: CSSProperties | undefined =
    activeIndex !== undefined
      ? { animation: "none", transform: `translateX(${activeIndex * 100}%)` }
      : undefined;

  return (
    <nav className={styles.nav} style={vars}>
      <span className={styles.brand}>{brand}</span>
      <div className={styles.menu}>
        <span className={styles.indicator} style={indicatorStyle} aria-hidden="true" />
        {items.map((label) => (
          <span key={label} className={styles.item}>{label}</span>
        ))}
      </div>
      <button type="button" className={styles.cta}>{cta}</button>
    </nav>
  );
}