@charset "utf-8";
/* CSS Document */
/* === ヘッダー共通設定 === */
header {
  position: fixed;
  top: 0; left: 0; right: 0;
  background: rgba(0,0,0,0.5);
  padding: 8px 20px;
  height: 100px;
  z-index: 10;
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
}

header .logo {
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
}

header .logo img {
  height: 80px;
}

header nav a {
  color: #fff;
  text-decoration: none;
  margin: 0 15px;
  font-weight: bold;
  letter-spacing: 0.05em;
}

header nav a:hover {
  text-decoration: underline;
}

/* === ハンバーガーメニュー === */
.menu-toggle {
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.8);
  display: none;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  backdrop-filter: blur(6px);
  flex-direction: column;
  z-index: 11;
}

.menu-toggle span {
  display: block;
  width: 25px;
  height: 3px;
  background: #373737;
  color: #373737;
  margin: 4px 0;
  border-radius: 1px;
  transition:
    transform 0.3s ease,
    opacity 0.25s ease,
    background 0.25s ease;
}

/* ライトモード対応 */
@media (prefers-color-scheme: light) {
  .menu-toggle span {
    background: #111;
  }
}

/* === スマホ用レイアウト === */
@media (max-width: 768px) {
  header {
    height: 64px;
  }

  header .logo img {
    height: 48px;
  }

  .menu-toggle {
    display: inline-flex;
	background: rgba(255,255,255,0.8);
  }

  header .site-nav {
    position: fixed;
    left: 0;
    right: 0;
    top: 64px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    background: rgba(0, 0, 0, 0.88);
    backdrop-filter: blur(8px);
    border-top: 1px solid var(--border);
    padding: 14px 18px;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.28s ease, opacity 0.22s ease;
    z-index: 10;
  }

  header .site-nav.open {
    max-height: 60svh;
    opacity: 1;
  }

  header .site-nav a {
    margin: 6px 0;
    font-size: 1.05rem;
  }

  /* === ハンバーガー開閉アニメ === */
  .menu-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(11px) rotate(45deg);
  }
  .menu-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
  }
  .menu-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-11px) rotate(-45deg);
  }
}

/* === 本文との余白調整（必要に応じて） === */
main.wrap {
  padding-top: 120px; /* header高さ + 余白 */
}