/* ===== Mobile hamburger nav (add-on) ===== */

/* Hidden by default on desktop */
.hamburger { display: none; }
.nav-backdrop { display: none; }

/* Smartphone & small tablets */
@media (max-width: 840px) {

  /* Off-canvas nav panel */
  nav {
    width: 80vw;
    max-width: 320px;
    height: 100vh;
    transform: translateX(-100%);
    transition: transform .3s ease;
    box-shadow: none !important;
    border-right: 2px solid #f1a950;
    z-index: 1000;
    position: fixed; /* ensure it overlays content */
    top: 0; left: 0;
    background: #fff;
  }

  /* Open state */
  body.nav-open nav { transform: translateX(0); }

  /* Backdrop to close the drawer */
  .nav-backdrop { display: none; }
  body.nav-open .nav-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.35);
    z-index: 900;
  }

  /* Content should not be pushed on mobile */
  .main, .footer { margin-left: 0 !important; }

  /* Hamburger button */
  .hamburger {
    display: inline-flex;
    position: fixed;
    top: 12px;
    left: 12px;
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    background: #fff;
    border: 2px solid #f1a950;
    z-index: 1100;
    cursor: pointer;
  }

  .hamburger .bar {
    width: 22px;
    height: 2px;
    background: #333;
    position: relative;
  }
  .hamburger .bar::before,
  .hamburger .bar::after {
    content: "";
    position: absolute;
    left: 0;
    width: 22px;
    height: 2px;
    background: #333;
  }
  .hamburger .bar::before { top: -7px; }
  .hamburger .bar::after  { top:  7px; }
}

/* ▼ メニューオープン時の「閉じる」アイコン表示 */
body.nav-open .hamburger .bar {
  background: transparent; /* 真ん中の線を消す */
}

body.nav-open .hamburger .bar::before {
  transform: rotate(45deg);
  top: 0;  /* 中央に寄せる */
}

body.nav-open .hamburger .bar::after {
  transform: rotate(-45deg);
  top: 0;  /* 中央に寄せる */
}

/* アニメーションを滑らかに */
.hamburger .bar,
.hamburger .bar::before,
.hamburger .bar::after {
  transition: all 0.3s ease;
}