/* ====== 基本デザイン（PC基準） ====== */
.side-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 220px;
  height: 100%;
  padding: 80px 10px 20px;
  background: #EDE6DA; /* 白練より少し濃い和紙色 */
  box-shadow: 2px 0 5px rgba(0,0,0,0.1);
  transition: transform 0.3s ease;
  z-index: 1001;
  overflow-y: auto;

}

.side-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.side-nav li {
  margin: 10px 0;
}

.side-nav a {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: #006600;
  font-size: 16px;
  padding: 8px;
  border-radius: 6px;
  transition: background 0.2s;
}

.side-nav a:hover {
  background: #C41E3A;
  color: #F8F4E6;
}

.side-nav .icon {
  display: inline-block;
  font-size: 20px;
  color: white;
  background: #9E3D3F;
  border-radius: 50%;
  width: 28px;
  height: 28px;
  line-height: 28px;
  text-align: center;
  margin-right: 10px;
  flex-shrink: 0;
}

/* ====== スクロールバー装飾 ====== */
.side-nav::-webkit-scrollbar { width: 6px; }
.side-nav::-webkit-scrollbar-thumb {
  background-color: rgba(0,0,0,0.3);
  border-radius: 3px;
}
.side-nav { scrollbar-width: thin; scrollbar-color: rgba(0,0,0,0.3) transparent; }

/* ====== メニューボタン ====== */
.menu-toggle {
  display: none; /* PCでは非表示 */
  position: fixed;
  top: 15px;
  left: 15px;
  z-index: 1100;
  background-color: #9E3D3F;
  color: #fff;
  border: none;
  padding: 10px 14px;
  border-radius: 6px;
  font-size: 18px;
  cursor: pointer;
}

/* ====== 半透明背景 ====== */
.overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  z-index: 1000;  /* 1000; **/
  opacity: 0;
  transition: opacity 0.3s ease;
}
.overlay.active {
  display: block;
  opacity: 1;
}

/* ====== PC（1024px～） ====== */
@media screen and (min-width: 1024px) {
  .side-nav {
    transform: none;
  }
  .menu-toggle {
    display: none;
  }
  .overlay {
    display: none !important;
  }
}




/* ====== PC（1024px～） ====== */
@media screen and (min-width: 1024px) {
    .menu-toggle { display: none; }  /* ボタン非表示 */
  .side-nav {
    transform: none; /* ← これで常時表示 */
    width: 220px;/*220px;*/
    padding-top: 80px;/*80px;*/
  }
  .side-nav a {
    font-size: 18px;/*16px;*/
    padding: 6px;

  }
}


/* ===== タブレット（例：768px以下） ===== */
@media screen and (min-width: 768px) and (max-width: 1023px) {
  .menu-toggle { display: none; }  /* ボタン非表示 */
  .side-nav {
    transform: none; /* ← これで常時表示 */
    width: 220px;
    padding-top: 80px;
  }
  .side-nav a {
    font-size: 16px;/*14px;*/
    padding: 6px;

  }
}


/* ====== スマートフォン（〜767px） ====== */
@media screen and (max-width: 767px) {
  .menu-toggle {
    display: block;
  }
  .side-nav {
    transform: translateX(-100%);
    width: 180px;
    padding-top: 80px;　/** 60px **/
  }
  .side-nav.active {
    transform: translateX(0);
  }
  .side-nav a {
    font-size: 14px;/*13px;*/
    padding: 6px;
  }
  .side-nav .icon {
    width: 24px;
    height: 24px;
    line-height: 24px;
    font-size: 16px;
  }
}