02Shape-badge nav

<main class="stage">
  <nav class="navm" aria-label="Demo navigation">
    <a class="navm__tab" href="#">
      <span class="navm__badge navm__badge--half" aria-hidden="true"></span>
      <span class="navm__label">Home</span>
    </a>
    <a class="navm__tab" href="#">
      <span class="navm__badge navm__badge--circle" aria-hidden="true"></span>
      <span class="navm__label">Materials</span>
    </a>
    <a class="navm__tab" href="#">
      <span class="navm__badge navm__badge--tri" aria-hidden="true"></span>
      <span class="navm__label">Pricing</span>
    </a>
  </nav>
</main>

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

// 멤피스 팔레트 — 01 과 같은 값 (대비 실측치는 01 참고)
$mem-base:  #fdf4ec;
$mem-sheet: #ffffff;
$mem-ink:   #241f26;
$mem-stone: #5d5560;
$mem-coral: #d5aea9;
$mem-lemon: #cec29c;
$mem-sky:   #82adc2;
$mem-mint:  #71b9ab;
$mem-pink:  #ebd6db;

$duration: $dur-loop;      // 활성 칸이 세 개를 한 바퀴 도는 주기
$easing: $ease-pop;        // 배지가 튀어 오를 때만 튕긴다
$color: $mem-lemon;        // 무대(레몬)

@include stage($mem-lemon);

.navm {
  box-sizing: border-box;
  display: grid;
  grid-template-columns: repeat(3, 1fr);   // 칸 폭은 그리드가 정한다 — 고정 px 인디케이터가 없다(BD19 무관)
  width: clamp(232px, 76vw, 348px);
  padding: $sp-1;
  border-radius: $r-card;
  background: $mem-sheet;
  border: 3px solid $mem-ink;
  box-shadow: 0 6px 0 $mem-ink;
}

.navm__tab {
  --on: #{$mem-coral};
  position: relative;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: $sp-1;
  padding: $sp-3 $sp-2 $sp-2;
  border-radius: $r-control;
  text-decoration: none;
}
.navm__tab:nth-child(1) { --on: #{$mem-coral}; }
.navm__tab:nth-child(2) { --on: #{$mem-sky}; }
.navm__tab:nth-child(3) { --on: #{$mem-mint}; }

// 활성 칸은 한 프레임 컷(steps)으로 바뀐다 — 반투명 유령 프레임이 생기지 않는다
.navm__tab {
  animation: tabFill $duration steps(1, end) infinite;
}
.navm__tab:nth-child(2) { animation-delay: -.6667s; }
.navm__tab:nth-child(3) { animation-delay: -1.3333s; }

.navm__tab:focus-visible {
  outline: 3px solid $mem-ink;
  outline-offset: 2px;
}

// 형상 배지 — 원·반원·삼각. 활성 칸 차례에 위로 튀어 오른다
.navm__badge {
  display: block;
  width: 34px;
  height: 34px;
  animation: badgePop $duration $easing infinite;
}
.navm__tab:nth-child(2) .navm__badge { animation-delay: -.6667s; }
.navm__tab:nth-child(3) .navm__badge { animation-delay: -1.3333s; }

.navm__badge--circle {
  border-radius: 50%;
  background: var(--on);
  border: 3px solid $mem-ink;
}
.navm__badge--half {
  width: 40px;
  height: 22px;
  margin-bottom: 12px;       // 반원 높이를 원과 맞춘다
  border-radius: $r-pill $r-pill 0 0;
  background: var(--on);
  border: 3px solid $mem-ink;
}
.navm__badge--tri {
  width: 40px;
  height: 36px;
  background: var(--on);
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
}

.navm__label {
  color: $mem-ink;
  font-weight: 700; font-size: clamp(12px, 2.8vw, 14px); line-height: 1;
  font-family: inherit;
}

// 활성 창(0~33%) 동안: 칸 배경 = 자기 색(컷 교체), 배지 = translateY 팝(부드럽게)
@keyframes tabFill {
  0%, 33.32%   { background: var(--on); }
  33.33%, 100% { background: transparent; }
}
@keyframes badgePop {
  0%       { transform: translateY(0); }
  6%, 28%  { transform: translateY(-7px); }
  33.33%, 100% { transform: translateY(0); }
}

@media (max-width: 340px), (max-height: 220px) {
  .navm { width: 220px; }
  .navm__tab { padding: $sp-2 $sp-1; }
  .navm__badge { width: 26px; height: 26px; }
  .navm__badge--half { width: 30px; height: 16px; margin-bottom: $sp-2; }
  .navm__badge--tri { width: 30px; height: 27px; }
  .navm__label { font-size: 11px; }
}

@media (prefers-reduced-motion: reduce) {
  .navm__tab, .navm__badge { animation: none !important; }
  // 움직임을 끊은 뒤에도 활성 상태 하나는 보여 준다 — 두 번째 칸
  .navm__tab:nth-child(2) { background: $mem-sky; }
}

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #cec29c;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.navm {
  box-sizing: border-box;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  width: clamp(232px, 76vw, 348px);
  padding: 4px;
  border-radius: 16px;
  background: #ffffff;
  border: 3px solid #241f26;
  box-shadow: 0 6px 0 #241f26;
}

.navm__tab {
  --on: #d5aea9;
  position: relative;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 12px 8px 8px;
  border-radius: 12px;
  text-decoration: none;
}

.navm__tab:nth-child(1) {
  --on: #d5aea9;
}

.navm__tab:nth-child(2) {
  --on: #82adc2;
}

.navm__tab:nth-child(3) {
  --on: #71b9ab;
}

.navm__tab {
  animation: tabFill 2s steps(1, end) infinite;
}

.navm__tab:nth-child(2) {
  animation-delay: -0.6667s;
}

.navm__tab:nth-child(3) {
  animation-delay: -1.3333s;
}

.navm__tab:focus-visible {
  outline: 3px solid #241f26;
  outline-offset: 2px;
}

.navm__badge {
  display: block;
  width: 34px;
  height: 34px;
  animation: badgePop 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.navm__tab:nth-child(2) .navm__badge {
  animation-delay: -0.6667s;
}

.navm__tab:nth-child(3) .navm__badge {
  animation-delay: -1.3333s;
}

.navm__badge--circle {
  border-radius: 50%;
  background: var(--on);
  border: 3px solid #241f26;
}

.navm__badge--half {
  width: 40px;
  height: 22px;
  margin-bottom: 12px;
  border-radius: 999px 999px 0 0;
  background: var(--on);
  border: 3px solid #241f26;
}

.navm__badge--tri {
  width: 40px;
  height: 36px;
  background: var(--on);
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
}

.navm__label {
  color: #241f26;
  font-weight: 700;
  font-size: clamp(12px, 2.8vw, 14px);
  line-height: 1;
  font-family: inherit;
}

@keyframes tabFill {
  0%, 33.32% {
    background: var(--on);
  }
  33.33%, 100% {
    background: transparent;
  }
}
@keyframes badgePop {
  0% {
    transform: translateY(0);
  }
  6%, 28% {
    transform: translateY(-7px);
  }
  33.33%, 100% {
    transform: translateY(0);
  }
}
@media (max-width: 340px), (max-height: 220px) {
  .navm {
    width: 220px;
  }
  .navm__tab {
    padding: 8px 4px;
  }
  .navm__badge {
    width: 26px;
    height: 26px;
  }
  .navm__badge--half {
    width: 30px;
    height: 16px;
    margin-bottom: 8px;
  }
  .navm__badge--tri {
    width: 30px;
    height: 27px;
  }
  .navm__label {
    font-size: 11px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .navm__tab, .navm__badge {
    animation: none !important;
  }
  .navm__tab:nth-child(2) {
    background: #82adc2;
  }
}

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

export type NavMemphisProps = {
  /** 탭 이름 3개 */
  tabs?: string[];
  /** 한 주기(기본 2000ms) */
  duration?: number;
  easing?: string;
  /** 데모 무대 색(참고용 — 칸마다 색은 고정) */
  color?: string;
};

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

export default function NavMemphis({
  tabs = ["홈", "재료", "요금"],
  duration = 2000,
  easing = "cubic-bezier(.2,1.4,.4,1)",
  color = "#ffcf33",
}: NavMemphisProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  /* 배지 모양은 칸 순서대로 고정 — 반원 · 원 · 삼각 */
  const badges = [styles.badgeHalf, styles.badgeCircle, styles.badgeTri];

  return (
    <nav className={styles.navm} style={vars} aria-label="데모 내비게이션">
      {tabs.map((t, i) => (
        <a key={t} className={styles.tab} href="#">
          <span className={`${styles.badge} ${badges[i % badges.length]}`} aria-hidden="true" />
          <span className={styles.label}>{t}</span>
        </a>
      ))}
    </nav>
  );
}