02Transparent nav

<main class="stage">
  <nav class="nav-a">
    <span class="nav-a__brand">Aurora</span>
    <div class="nav-a__menu">
      <span class="nav-a__pill" aria-hidden="true"></span>
      <span class="nav-a__label">Home</span>
      <span class="nav-a__label">Features</span>
      <span class="nav-a__label">Pricing</span>
    </div>
    <button class="nav-a__cta" type="button">Try it free</button>
  </nav>
</main>

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

$duration: $dur-loop;
$easing: $ease-spring;
$color: $subject-blue;

@include stage($stage-yellow);

.nav-a {
  position: relative;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  gap: $sp-3;
  width: clamp(240px, 82vw, 380px);
  padding: $sp-2 $sp-3;
  border-radius: $r-pill;
  background: rgba($stage-ink, .62);   // .38 은 흰 글자가 2.98:1 이었다 — AA 4.5 (brand 6.49 · label 5.35)
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba($stage-paper, .18);
  overflow: hidden;
}
.nav-a::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .3;
  mix-blend-mode: overlay;
  background-image:
    radial-gradient(rgba($stage-paper, .6) .5px, transparent .5px),
    radial-gradient(rgba($stage-ink, .6) .5px, transparent .5px);
  background-size: 3px 3px, 5px 5px;
  border-radius: inherit;
}
.nav-a__brand { position: relative; z-index: 1; padding-left: $sp-2; color: $stage-paper; font: 700 clamp(12px, 3vw, 14px)/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif; }
.nav-a__menu {
  position: relative;
  z-index: 1;
  flex: 1;
  display: flex;
  background: rgba($stage-paper, .08);
  border-radius: $r-pill;
  padding: $sp-1;
}
// 인디케이터는 퍼센트 폭(항목 3등분)으로 움직인다 — 고정 px 짐작값 금지 (BD19)
.nav-a__pill {
  position: absolute;
  top: $sp-1;
  bottom: $sp-1;
  left: $sp-1;
  width: calc((100% - #{$sp-1 * 2}) / 3);
  border-radius: $r-pill;
  background: $color;
  animation: pillSlide $duration $easing infinite;
}
.nav-a__label { position: relative; z-index: 1; flex: 1; text-align: center; padding: $sp-2 0; color: $stage-paper; font-weight: 600; font-size: clamp(10.5px, 2.6vw, 12px); line-height: 1; }
.nav-a__cta { position: relative; z-index: 1; border: 0; border-radius: $r-pill; background: $stage-paper; color: $stage-ink; padding: $sp-2 $sp-4; font-weight: 700; font-size: clamp(10.5px, 2.6vw, 12px); line-height: 1; }

@keyframes pillSlide {
  0%, 12%  { transform: translateX(0%); }
  38%, 50% { transform: translateX(100%); }
  76%, 88% { transform: translateX(200%); }
  100%     { transform: translateX(0%); }
}

@media (prefers-reduced-motion: reduce) {
  .nav-a__pill { animation: none; }
}

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);
}

.nav-a {
  position: relative;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  gap: 12px;
  width: clamp(240px, 82vw, 380px);
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.62);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  overflow: hidden;
}

.nav-a::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.3;
  mix-blend-mode: overlay;
  background-image: radial-gradient(rgba(255, 255, 255, 0.6) 0.5px, transparent 0.5px), radial-gradient(rgba(23, 20, 26, 0.6) 0.5px, transparent 0.5px);
  background-size: 3px 3px, 5px 5px;
  border-radius: inherit;
}

.nav-a__brand {
  position: relative;
  z-index: 1;
  padding-left: 8px;
  color: #ffffff;
  font: 700 clamp(12px, 3vw, 14px)/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.nav-a__menu {
  position: relative;
  z-index: 1;
  flex: 1;
  display: flex;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  padding: 4px;
}

.nav-a__pill {
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: 4px;
  width: calc((100% - 8px) / 3);
  border-radius: 999px;
  background: #2f6df6;
  animation: pillSlide 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

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

.nav-a__cta {
  position: relative;
  z-index: 1;
  border: 0;
  border-radius: 999px;
  background: #ffffff;
  color: #17141a;
  padding: 8px 16px;
  font-weight: 700;
  font-size: clamp(10.5px, 2.6vw, 12px);
  line-height: 1;
}

@keyframes pillSlide {
  0%, 12% {
    transform: translateX(0%);
  }
  38%, 50% {
    transform: translateX(100%);
  }
  76%, 88% {
    transform: translateX(200%);
  }
  100% {
    transform: translateX(0%);
  }
}
@media (prefers-reduced-motion: reduce) {
  .nav-a__pill {
    animation: none;
  }
}

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

export type AuroraNavProps = {
  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 AuroraNav({
  brand = "Aurora",
  items = ["Home", "Features", "Pricing"],
  cta = "Try it free",
  duration = 2000,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#2f6df6",
}: AuroraNavProps) {
  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.menu}>
        <span className={styles.pill} aria-hidden="true" />
        {items.map((label) => (
          <span key={label} className={styles.label}>{label}</span>
        ))}
      </div>
      <button type="button" className={styles.cta}>{cta}</button>
    </nav>
  );
}