section p:nth-child(3n + 1) { background-color: #fce4ec; }
section p:nth-child(3n + 2) { background-color: #e3f2fd; }
section p:nth-child(3n + 3) { background-color: #e8f5e9; }

/**/
html, body {
  margin: 0;
  padding: 0;
  /* height: 100%; */
  /* height: 100dvh; */
  height: auto;
  /* overflow: hidden; */
  overflow-y: auto;
  overscroll-behavior: none;
}

.page-content {
  /* height: 100vh; */
  /* height: 100dvh; */
  height: auto;
  /* overflow-y: auto; */
  overflow-y: visible;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

#menu-toggle:checked ~ .body-wrapper {
  position: fixed;
  width: 100%;
  top: 0;
  left: 0;
}

#menu-toggle {
  display: none;
}

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  z-index: 999;
  overscroll-behavior: contain;
  touch-action: none;
}

.side-panel {
  position: fixed;
  top: 0;
  right: auto;
  width: 50%;
  max-width: 80vw;
  /* height: 100vh; */
  height: 100dvh;
  background: #fff;
  box-shadow: -4px 0 10px rgba(0,0,0,0.2);
  transform: translateX(-100%);
  transition: transform 0.3s ease;
  z-index: 1000;
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.side-panel-content {
  margin-top: 10px;
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  background-color: silver;
  padding-bottom: 30px;
}

.close-button {
  display: inline-block;
  font-size: 20px;
  cursor: pointer;
  margin-bottom: 10px;
}

#menu-toggle:checked ~ .overlay { opacity: 1; pointer-events: auto; } /* オーバーレイ表示 */
#menu-toggle:checked ~ .side-panel { transform: translateX(0); } /* 横パネル */
#menu-toggle:checked ~ .page-content { overflow: hidden; } /* 背景スクロール止める */
#menu-toggle:checked ~ .body-wrapper { overflow: hidden; }

/* -------------------- ハンバーガー -------------------- */
:root {
  --hamburger-line-length: 26px;
  --hamburger-line-thickness: 3px;
  --hamburger-line-offset: 8px;
  --hamburger-line-color: #F80;
  --hamburger-btn-size: 40px;
  --hamburger-border-thickness: 2px;
}

.hamburger {
  position: fixed;
  top: 20px;
  right: 20px;
  width: var(--hamburger-btn-size);
  height: var(--hamburger-btn-size);
  background-color: rgba(0, 255, 0, .3);
  border: var(--hamburger-border-thickness) solid var(--hamburger-line-color);
  border-radius: 50%;
  cursor: pointer;
  z-index: 1002;
}

/* 3本線の基本 */
.hamburger span {
  position: absolute;
  left: 50%;
  top: 50%;
  width: var(--hamburger-line-length);
  height: var(--hamburger-line-thickness);
  background: var(--hamburger-line-color);
  border-radius: 2px;
  transform: translate(-50%, -50%);
  transition: 0.25s ease;
}

.hamburger span:nth-child(1) { transform: translate(-50%, calc(-50% - var(--hamburger-line-offset))); }
.hamburger span:nth-child(2) { transform: translate(-50%, -50%); }
.hamburger span:nth-child(3) { transform: translate(-50%, calc(-50% + var(--hamburger-line-offset))); }
/* 開いたとき：Xになる */
#menu-toggle:checked + .hamburger span:nth-child(1) { transform: translate(-50%, -50%) rotate(45deg); }
#menu-toggle:checked + .hamburger span:nth-child(2) { opacity: 0; }
#menu-toggle:checked + .hamburger span:nth-child(3) { transform: translate(-50%, -50%) rotate(-45deg); }