08Lan tỏa hình tròn từ icon

<main class="stage is-demo">
  <button class="burger" type="button" aria-label="Mở menu">
    <span class="bar bar1"></span>
    <span class="bar bar2"></span>
    <span class="bar bar3"></span>
  </button>
  <div class="reveal" aria-hidden="true">
    <nav class="reveal__links">
      <a class="reveal__link" href="#">Trang chủ</a>
      <a class="reveal__link" href="#">Giới thiệu</a>
      <a class="reveal__link" href="#">Sản phẩm</a>
      <a class="reveal__link" href="#">Liên hệ</a>
    </nav>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: 450ms;         // 원이 화면을 덮는 시간
$easing: $ease-spring;
$color: $subject-blue;    // 줄·링크 글자 색 (paper 무대라 blue)

@include stage($stage-paper);

.stage { position: relative; overflow: hidden; }

.burger {
  position: absolute; top: clamp(14px, 5vmin, 20px); right: clamp(14px, 5vmin, 20px);
  z-index: 3; width: clamp(34px, 10vmin, 42px); height: clamp(34px, 10vmin, 42px);
  border: 0; border-radius: $r-control; background: transparent;
  padding: 0; cursor: pointer; -webkit-tap-highlight-color: transparent;
}

.bar {
  position: absolute; left: 50%; top: 50%;
  width: clamp(20px, 6.4vmin, 26px); height: 3px; border-radius: 2px;
  background: $color;
  transition: transform $dur-quick $easing, opacity $dur-quick $easing;
}
.bar1 { transform: translate(-50%, -50%) translateY(-7px) rotate(0deg); }
.bar2 { transform: translate(-50%, -50%) scaleX(1); opacity: 1; }
.bar3 { transform: translate(-50%, -50%) translateY(7px) rotate(0deg); }

// 아이콘 위치(오른쪽 위)를 원점으로 clip-path 원이 커지며 화면을 덮는다. 크기·위치는 그대로,
// clip-path 반지름만 바뀌므로 transform·opacity 규칙과 같은 값으로 취급한다 (레이아웃 재계산 없음)
.reveal {
  position: absolute; inset: 0; z-index: 2;
  display: grid; place-items: center;
  background: $stage-ink;
  clip-path: circle(0% at calc(100% - 30px) 30px);
  transition: clip-path $duration $easing;
}
.reveal__links { display: grid; gap: clamp(8px, 3vmin, 14px); text-align: center; }
.reveal__link { font-weight: 700; font-size: clamp(15px, 5.2vmin, 20px); line-height: 1; font-family: inherit; color: $color; text-decoration: none; }

.stage.is-open .bar1 { transform: translate(-50%, -50%) translateY(0) rotate(45deg); }
.stage.is-open .bar2 { transform: translate(-50%, -50%) scaleX(0); opacity: 0; }
.stage.is-open .bar3 { transform: translate(-50%, -50%) translateY(0) rotate(-45deg); }
.stage.is-open .reveal { clip-path: circle(150% at calc(100% - 30px) 30px); }

.stage.is-demo .bar1   { animation: bar1-loop $dur-loop $easing infinite; }
.stage.is-demo .bar2   { animation: bar2-loop $dur-loop $easing infinite; }
.stage.is-demo .bar3   { animation: bar3-loop $dur-loop $easing infinite; }
.stage.is-demo .reveal { animation: reveal-loop $dur-loop $easing infinite; }

@keyframes bar1-loop {
  0%   { transform: translate(-50%, -50%) translateY(-7px) rotate(0deg); }
  15%  { transform: translate(-50%, -50%) translateY(0) rotate(45deg); }
  70%  { transform: translate(-50%, -50%) translateY(0) rotate(45deg); }
  85%  { transform: translate(-50%, -50%) translateY(-7px) rotate(0deg); }
  100% { transform: translate(-50%, -50%) translateY(-7px) rotate(0deg); }
}
@keyframes bar2-loop {
  0%   { transform: translate(-50%, -50%) scaleX(1); opacity: 1; }
  15%  { transform: translate(-50%, -50%) scaleX(0); opacity: 0; }
  70%  { transform: translate(-50%, -50%) scaleX(0); opacity: 0; }
  85%  { transform: translate(-50%, -50%) scaleX(1); opacity: 1; }
  100% { transform: translate(-50%, -50%) scaleX(1); opacity: 1; }
}
@keyframes bar3-loop {
  0%   { transform: translate(-50%, -50%) translateY(7px) rotate(0deg); }
  15%  { transform: translate(-50%, -50%) translateY(0) rotate(-45deg); }
  70%  { transform: translate(-50%, -50%) translateY(0) rotate(-45deg); }
  85%  { transform: translate(-50%, -50%) translateY(7px) rotate(0deg); }
  100% { transform: translate(-50%, -50%) translateY(7px) rotate(0deg); }
}
@keyframes reveal-loop {
  0%   { clip-path: circle(0% at calc(100% - 30px) 30px); }
  20%  { clip-path: circle(150% at calc(100% - 30px) 30px); }
  70%  { clip-path: circle(150% at calc(100% - 30px) 30px); }
  85%  { clip-path: circle(0% at calc(100% - 30px) 30px); }
  100% { clip-path: circle(0% at calc(100% - 30px) 30px); }
}

// ── 접근성 ─────────────────────────────────────────
@media (prefers-reduced-motion: reduce) {
  .stage.is-demo .bar1, .stage.is-demo .bar2, .stage.is-demo .bar3, .stage.is-demo .reveal { animation: none; }
  .bar, .reveal { transition-duration: 1ms; }
}

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

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

.stage {
  position: relative;
  overflow: hidden;
}

.burger {
  position: absolute;
  top: clamp(14px, 5vmin, 20px);
  right: clamp(14px, 5vmin, 20px);
  z-index: 3;
  width: clamp(34px, 10vmin, 42px);
  height: clamp(34px, 10vmin, 42px);
  border: 0;
  border-radius: 12px;
  background: transparent;
  padding: 0;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.bar {
  position: absolute;
  left: 50%;
  top: 50%;
  width: clamp(20px, 6.4vmin, 26px);
  height: 3px;
  border-radius: 2px;
  background: #2f6df6;
  transition: transform 220ms cubic-bezier(0.2, 0.8, 0.2, 1), opacity 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.bar1 {
  transform: translate(-50%, -50%) translateY(-7px) rotate(0deg);
}

.bar2 {
  transform: translate(-50%, -50%) scaleX(1);
  opacity: 1;
}

.bar3 {
  transform: translate(-50%, -50%) translateY(7px) rotate(0deg);
}

.reveal {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: grid;
  place-items: center;
  background: #17141a;
  clip-path: circle(0% at calc(100% - 30px) 30px);
  transition: clip-path 450ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.reveal__links {
  display: grid;
  gap: clamp(8px, 3vmin, 14px);
  text-align: center;
}

.reveal__link {
  font-weight: 700;
  font-size: clamp(15px, 5.2vmin, 20px);
  line-height: 1;
  font-family: inherit;
  color: #2f6df6;
  text-decoration: none;
}

.stage.is-open .bar1 {
  transform: translate(-50%, -50%) translateY(0) rotate(45deg);
}

.stage.is-open .bar2 {
  transform: translate(-50%, -50%) scaleX(0);
  opacity: 0;
}

.stage.is-open .bar3 {
  transform: translate(-50%, -50%) translateY(0) rotate(-45deg);
}

.stage.is-open .reveal {
  clip-path: circle(150% at calc(100% - 30px) 30px);
}

.stage.is-demo .bar1 {
  animation: bar1-loop 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.stage.is-demo .bar2 {
  animation: bar2-loop 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.stage.is-demo .bar3 {
  animation: bar3-loop 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.stage.is-demo .reveal {
  animation: reveal-loop 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

@keyframes bar1-loop {
  0% {
    transform: translate(-50%, -50%) translateY(-7px) rotate(0deg);
  }
  15% {
    transform: translate(-50%, -50%) translateY(0) rotate(45deg);
  }
  70% {
    transform: translate(-50%, -50%) translateY(0) rotate(45deg);
  }
  85% {
    transform: translate(-50%, -50%) translateY(-7px) rotate(0deg);
  }
  100% {
    transform: translate(-50%, -50%) translateY(-7px) rotate(0deg);
  }
}
@keyframes bar2-loop {
  0% {
    transform: translate(-50%, -50%) scaleX(1);
    opacity: 1;
  }
  15% {
    transform: translate(-50%, -50%) scaleX(0);
    opacity: 0;
  }
  70% {
    transform: translate(-50%, -50%) scaleX(0);
    opacity: 0;
  }
  85% {
    transform: translate(-50%, -50%) scaleX(1);
    opacity: 1;
  }
  100% {
    transform: translate(-50%, -50%) scaleX(1);
    opacity: 1;
  }
}
@keyframes bar3-loop {
  0% {
    transform: translate(-50%, -50%) translateY(7px) rotate(0deg);
  }
  15% {
    transform: translate(-50%, -50%) translateY(0) rotate(-45deg);
  }
  70% {
    transform: translate(-50%, -50%) translateY(0) rotate(-45deg);
  }
  85% {
    transform: translate(-50%, -50%) translateY(7px) rotate(0deg);
  }
  100% {
    transform: translate(-50%, -50%) translateY(7px) rotate(0deg);
  }
}
@keyframes reveal-loop {
  0% {
    clip-path: circle(0% at calc(100% - 30px) 30px);
  }
  20% {
    clip-path: circle(150% at calc(100% - 30px) 30px);
  }
  70% {
    clip-path: circle(150% at calc(100% - 30px) 30px);
  }
  85% {
    clip-path: circle(0% at calc(100% - 30px) 30px);
  }
  100% {
    clip-path: circle(0% at calc(100% - 30px) 30px);
  }
}
@media (prefers-reduced-motion: reduce) {
  .stage.is-demo .bar1, .stage.is-demo .bar2, .stage.is-demo .bar3, .stage.is-demo .reveal {
    animation: none;
  }
  .bar, .reveal {
    transition-duration: 1ms;
  }
}

(function () {
  var stage = document.querySelector('.stage');
  var burger = document.querySelector('.burger');
  var open = false;
  burger.addEventListener('click', function () {
    stage.classList.remove('is-demo');
    open = !open;
    stage.classList.toggle('is-open', open);
    burger.setAttribute('aria-label', open ? 'Đóng menu' : 'Mở menu');
  });
})();

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

export type CircleRevealProps = {
  links: string[];
  openLabel: string;
  closeLabel: string;
  /** 원이 화면을 덮는 시간 (기본 450ms) */
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function CircleReveal({
  links,
  openLabel,
  closeLabel,
  duration = 450,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#2f6df6",
}: CircleRevealProps) {
  const [open, setOpen] = useState(false);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  const cls = (base: string) => (open ? `${base} ${styles.isOpen}` : base);

  return (
    <div className={styles.stage} style={vars}>
      <button
        type="button"
        className={cls(styles.burger)}
        aria-label={open ? closeLabel : openLabel}
        onClick={() => setOpen((v) => !v)}
      >
        <span className={`${styles.bar} ${styles.bar1}`} />
        <span className={`${styles.bar} ${styles.bar2}`} />
        <span className={`${styles.bar} ${styles.bar3}`} />
      </button>
      <div className={cls(styles.reveal)} aria-hidden={!open}>
        <nav className={styles.revealLinks}>
          {links.map((label) => (
            <a key={label} className={styles.revealLink} href="#">
              {label}
            </a>
          ))}
        </nav>
      </div>
    </div>
  );
}