/* ==========================================================================
   1. Header - ヘッダー本体とスクロール制御
   ========================================================================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 999;
  width: 100%;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
  backdrop-filter: blur(10px);
  transition: all 0.4s var(--ease-default);
}

/* フローティング状態（JS制御用） */
.site-header.is-floating {
  top: 20px;
  right: 20px;
  left: 20px;
  width: calc(100% - 40px);
  border-radius: 12px;
}

/* スクロール時のスタイル統合 */
.site-header.scrolled,
.site-header.is-scrolled {
  top: 0;
  right: 0;
  left: 0;
  width: 100%;
  border-radius: 0;
  background: var(--color-bg);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.header-container {
  display: flex;
  align-items: center;
  transition: padding 0.4s ease;
}

/* ロゴサイズ制御 */
.custom-logo-link img {
  width: auto;
  height: 40px;
  transition: height 0.4s ease;
}

.site-header.scrolled .custom-logo-link img,
.site-header.is-scrolled .custom-logo-link img {
  height: 30px;
}

/* ==========================================================================
   2. PC Navigation - デスクトップ用メニュー (min-width: 768px)
   ========================================================================== */

@media (min-width: 768px) {
  .custom-menu-toggle,
  .overlay-navigation {
    display: none !important;
  }

  .header-container {
    padding: 1.5rem 2rem;
    justify-content: space-between;
  }

  .site-header.scrolled .header-container,
  .site-header.is-scrolled .header-container {
    padding: 0.8rem 2rem;
  }

  .custom-logo-link img {
    height: 60px;
  }

  .site-header.scrolled .custom-logo-link img,
  .site-header.is-scrolled .custom-logo-link img {
    height: 40px;
  }

  .main-navigation {
    display: block !important;
  }

  .main-navigation ul {
    display: flex;
    margin: 0;
    padding: 0;
    gap: 1.5rem;
    list-style: none;
  }

  .main-navigation li {
    position: relative;
  }

  .main-navigation li a {
    padding: 8px 16px;
    border-radius: 8px;
    color: var(--color-text);
    font-weight: bold;
    white-space: nowrap;
    transition: all 0.3s ease;
  }

  .main-navigation li a:hover {
    background: rgba(0, 124, 186, 0.1);
    color: var(--color-main);
  }

  /* ドロップダウン（子メニュー） */
  .main-navigation ul ul {
    position: absolute;
    top: 100%;
    left: 0;
    z-index: 10;
    display: block;
    min-width: 200px;
    margin: 0;
    padding: 10px 0;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
    flex-direction: column;
    gap: 0;
  }

  .main-navigation ul li:hover > ul {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  /* 孫メニュー */
  .main-navigation ul ul ul {
    top: 0;
    left: 100%;
    margin-top: 6px;
    margin-left: 36px;
  }

  .main-navigation ul ul li a {
    display: block;
    padding: 10px 20px;
    border-radius: 0;
  }

  .main-navigation ul ul li a:hover {
    background: #f8f8f8;
  }
}

/* ==========================================================================
   3. Mobile Navigation - スマホ用メニュー (max-width: 767px)
   ========================================================================== */

@media (max-width: 767px) {
  .main-navigation {
    display: none !important;
  }

  .header-container {
    padding: 1.2rem 1rem 0.5rem 1rem;
    flex-direction: column;
    justify-content: center;
    gap: 0.8rem;
  }

  /* トグルボタン */
  .custom-menu-toggle {
    position: relative;
    z-index: 1001;
    display: flex !important;
    padding: 8px 12px;
    border: none;
    background: none;
    cursor: pointer;
    align-items: center;
    gap: 10px;
  }

  .custom-menu-toggle::before {
    content: 'MENU>>>';
    color: var(--color-main);
    font-size: 11px;
    font-weight: 600;
    line-height: 1;
    letter-spacing: 0.15em;
    transition: color 0.3s;
  }

  .custom-menu-toggle.is-active::before {
    color: var(--color-text) !important;
  }

  .custom-menu-toggle .dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-main);
    transition: background 0.3s;
  }

  .custom-menu-toggle.is-active .dot {
    background: var(--color-text) !important;
  }

  /* オーバーレイ本体 */
  .overlay-navigation {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    width: 100%;
    height: 100vh;
    overflow-y: auto;
    background: rgba(255, 255, 255, 0.9);
    opacity: 0;
    visibility: hidden;
    clip-path: circle(0% at 90% 5%);
    transition: all 0.5s var(--ease-default);
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .overlay-navigation.is-active {
    opacity: 1;
    visibility: visible;
    clip-path: circle(150% at 90% 5%);
  }

  .nav-inner {
    width: 90%;
    max-height: 90vh;
    padding: 40px 0;
  }

  .overlay-menu {
    margin: 0;
    padding: 0;
    list-style: none;
    text-align: center;
  }

  .overlay-menu > li {
    margin: 20px 0;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.4s ease;
  }

  .overlay-navigation.is-active .overlay-menu > li {
    opacity: 1;
    transform: translateY(0);
  }

  .overlay-menu > li > a {
    color: var(--color-text);
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: 0.05em;
  }

  /* アコーディオン設定 */
  .overlay-menu .sub-menu {
    display: none;
    margin: 0;
    padding: 8px 0;
    list-style: none;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
  }

  .overlay-menu .sub-menu li { margin-bottom: 8px; }
  .overlay-menu .sub-menu .sub-menu li { margin: 8px 0; }

  .overlay-menu .sub-menu li a {
    padding: 8px 42px;
    color: #666;
    font-size: 1rem;
    font-weight: bold;
  }

  .overlay-menu .sub-menu .sub-menu li a {
    font-size: 0.85rem;
    font-weight: bold;
  }

  .menu-arrow { display: none !important; }

  /* プラス・マイナスアイコンのアニメーション */
  .overlay-menu .menu-item-has-children > a {
    position: relative;
    padding-right: 30px;
  }

  .overlay-menu .menu-item-has-children > a::before,
  .overlay-menu .menu-item-has-children > a::after {
    content: '';
    position: absolute;
    top: 50%;
    right: 10px;
    width: 14px;
    height: 2px;
    background-color: #333;
    transform-origin: center;
    transition: all 0.3s ease;
  }

  .overlay-menu .menu-item-has-children > a::after {
    transform: translateY(-50%) rotate(90deg);
  }

  .overlay-menu .menu-item-has-children > a::before {
    transform: translateY(-50%);
  }

  .menu-item-has-children.is-open > a::after {
    opacity: 0;
    transform: translateY(-50%) rotate(180deg);
  }

  .menu-item-has-children.is-open > a::before {
    background-color: var(--color-main);
  }
}

/* ==========================================================================
   4. Main Content Area
   ========================================================================== */

.site-main {
  margin-top: 66px;
  padding: 40px 20px;
}

@media (max-width: 767px) {
  .site-main {
    padding: 20px;
  }
}

/* ==========================================================================
   5. Footer - フッター
   ========================================================================== */

.site-footer {
  margin-right: 10px;
  margin-left: 10px;
  padding: 60px 0 40px;
  border-top: 1px solid var(--color-border);
  border-radius: 20px 20px 0 0;
  background: var(--color-bg);
}

.site-info {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  color: #999;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-align: center;
}

.copyright {
  margin-top: 30px;
  padding-top: 25px;
  border-top: 1px solid #f7f7f7;
  color: #999;
}

.copyright a {
  color: #888;
  font-weight: 700;
}

.copyright a:hover {
  color: var(--color-main);
}

/* Footer Navigation */
.footer-navigation ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-navigation > ul {
  display: grid;
  align-items: start;
  gap: 40px;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.footer-navigation > ul > li > a {
  display: block;
  margin-bottom: 6px;
  padding-bottom: 5px;
  color: var(--color-text);
  font-weight: bold;
}

.footer-navigation .sub-menu {
  margin-top: 10px;
}

.footer-navigation .sub-menu li {
  margin-bottom: 8px;
  font-size: 0.9rem;
}

.footer-navigation .sub-menu .sub-menu {
  margin-top: 5px;
  margin-left: 15px;
  padding-left: 10px;
}

@media (max-width: 767px) {
  .footer-navigation > ul {
    gap: 12px;
    grid-template-columns: 1fr;
  }
  
  .footer-navigation > ul > li {
    padding-bottom: 6px;
  }
  
  .footer-navigation > ul > li:last-child {
    border-bottom: none;
  }

  .footer-navigation li a {
    font-size: 13px;
  }
}