modalNav(2024年最新版)

<header class="gnav__modal">
  <div class="inner-layout">
    <div class="gnav__logo">
      <a href="/">
        <img src="<?php echo get_template_directory_uri(); ?>/assets/img/common/logo.svg" alt="logo">
      </a>
    </div>
    <div class="gnav__hamburger">
      <div class="border"></div>
    </div>
    <nav class="gnav__nav fade">
      <ul>
        <li>
          <a href="/"><span class="text">Home</span></a>
        </li>
        <li>
          <a href="/about/"><span class="text">About</span></a>
        </li>
        <li>
          <a href="/works/"><span class="text">Works</span></a>
        </li>
        <li>
          <a href="/contact/"><span class="text">Contact</span></a>
        </li>
      </ul>
    </nav>
    <div class="gnav__bg"></div>
  </div>
</header>

body.is--fixed {
  position: fixed;
  width: 100%;
  top: 0;
  left: 0;
}

@use "../global/_setting" as *;

// .gnav__modal
//=====================================================
.gnav__modal {
  width: 100%;
  height: 52px;
  position: fixed;
  top: 0;
  left: 0;
  @include z-index-10;
  @include media(pc) {
    height: 80px;
  }
  .inner-layout {
    padding: 0 3.5%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    @include media(pc) {
      margin-inline: auto;
      padding: 0 32px;
      height: 100%;
    }
  }
}

// .gnav__logo
//=====================================================
.gnav__logo {
  width: 92px;
  height: auto;
  display: flex;
  align-items: center;
  position: relative;
  top: 12px;
  @include media(pc) {
    width: 136px;
    top: 32px;
  }
  img {
    width: 100%;
  }
}

// .gnav__hamburger
//=====================================================
.gnav__hamburger {
  width: 52px;
  height: 52px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: absolute;
  top: 0;
  right: 0;
  @include z-index-4;
  gap: 6px 0;
  transition: 0.3s ease;
  @include media(pc) {
    display: none;
  }
  &:before {
    content: "";
    display: block;
    width: 50%;
    height: 2px;
    background: colors(black);
    transition: 0.3s ease;
    border-radius: 3px;
  }
  &:after {
    content: "";
    display: block;
    width: 50%;
    height: 2px;
    background: colors(black);
    transition: 0.3s ease;
    border-radius: 3px;
  }
  .border {
    width: 50%;
    height: 2px;
    background: colors(black);
    transition: 0.3s ease;
    border-radius: 3px;
  }
}

// .gnav__nav
//=====================================================
.gnav__nav {
  // 右からメニューが出る
  &.right {
    position: fixed;
    @include z-index-3;
    top: 0;
    right: -256px;
    width: 256px;
    height: 100dvh;
    background: colors(black);
    transition: 0.3s ease;
    overflow-y: scroll;
    padding-bottom: 50px;
    @include media(pc) {
      display: block;
      position: relative;
      transform: none;
      height: auto;
      background: none;
      overflow: inherit;
      width: min-content;
      left: auto;
      right: auto;
      padding-bottom: 0;
      height: 80px;
      margin-left: auto;
    }
    ul {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      font-size: 1.6rem;
      text-align: center;
      margin-top: 52px;
      background: red;
      @include media(pc) {
        flex-direction: row;
      }
      li {
        margin-bottom: 1.85em;
        line-height: 1.25;
        @include media(pc) {
          margin-bottom: 0;
        }
        &:last-of-type {
          margin-bottom: 0;
        }
        a {
          white-space: nowrap;
          transition: 0.3s ease;
        }
      }
    }
  }
  // fadeでメニューが出る
  &.fade {
    position: fixed;
    @include z-index-3;
    top: 0;
    left: 0;
    width: max-content;
    height: max-content;
    background: colors(white);
    transition: 0.3s ease;
    overflow-y: scroll;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    @include media(pc) {
      display: flex;
      position: relative;
      transform: none;
      height: auto;
      background: none;
      overflow: inherit;
      width: min-content;
      left: auto;
      right: auto;
      padding-bottom: 0;
      height: 80px;
      margin-left: auto;
      opacity: 1;
      visibility: visible;
      pointer-events: auto;
    }
    ul {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      font-size: 1.6rem;
      text-align: center;
      //background: red;
      position: fixed;
      inset: 0; /* 上下左右を0にする */
      margin: auto; 
      width: fit-content;
      height: fit-content;
      @include media(pc) {
        flex-direction: row;
        position: static;
        gap: 0 2.25em;
      }
      li {
        margin-bottom: 1.85em;
        line-height: 1.25;
        @include media(pc) {
          margin-bottom: 0;
        }
        &:last-of-type {
          margin-bottom: 0;
        }
        a {
          white-space: nowrap;
          transition: 0.3s ease;
          letter-spacing: 0.1em;
          position: relative;
          transform: translateY(0);
          display: block;
          &:hover {
            transform: translateY(-2px);
            .text {
              
            }
          }
          .text {
            transition: transform 0.3s ease, opacity 0.3s ease;
          }
        }
      }
    }
  }
}

// .gnav__bg
//=====================================================
.gnav__bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  height: 100dvh;
  @include z-index-2;
  background: rgba(255, 255, 255, 0.4);
  @include backdrop-filter(blur(20px));
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  // 状態変化
  @include media(pc) {
    display: none;
  }
  &.is--visible {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }
}

// 状態変化
//=====================================================
.gnav__modal {
  &.is--open {
    // .gnav__hamburger
    .gnav__hamburger {
      &:before {
        width: 40%;
        transform: rotate(45deg) translateX(4px) translateY(4px);
      }
      &:after {
        width: 40%;
        transform: rotate(-45deg) translateX(7px) translateY(-7px);
      }
      .border {
        opacity: 0;
      }
    }
    // .gnav__nav
    .gnav__nav {
      &.right {
        right: 0;
      }
      &.fade {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
      }
    }
  }
}

// g-nav modal
//=====================================================
document.addEventListener('DOMContentLoaded', function () {
  const hamburger = document.querySelector('.gnav__hamburger');
  const modal = document.querySelector('.gnav__modal');
  const bg = document.querySelector('.gnav__bg');
  const body = document.body;
  let scrollY = 0; // 現在のスクロール位置を保持

  // モーダルの開閉処理を関数化
  function openModal() {
    scrollY = window.scrollY; // 現在のスクロール位置を記録
    body.style.top = `-${scrollY}px`; // bodyの位置をスクロール位置に合わせる
    modal.classList.add('is--open');
    bg.classList.add('is--visible');
    body.classList.add('is--fixed');
  }

  function closeModal() {
    modal.classList.remove('is--open');
    bg.classList.remove('is--visible');
    body.classList.remove('is--fixed');
    body.style.top = ''; // topスタイルをリセット
    window.scrollTo(0, scrollY); // 元のスクロール位置に戻す
  }

  // ハンバーガーメニューのクリックでメニューの開閉
  hamburger.addEventListener('click', function () {
    if (modal.classList.contains('is--open')) {
      closeModal(); // モーダルが開いている場合は閉じる
    } else {
      openModal(); // モーダルが閉じている場合は開く
    }
  });

  // 背景エリアをクリックでメニューを閉じる
  bg.addEventListener('click', closeModal);
});