/* =====================================================
   Header
   ===================================================== */
.header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-base);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  border-bottom: 1px solid var(--color-border-light);
}

.header__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-4) 0;
  min-height: 80px;
}

/* Logo Styles */
.header__logo {
  flex-shrink: 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  text-decoration: none;
  transition: var(--transition-colors);
}

.logo__image {
  height: 48px;
  width: auto;
  object-fit: contain;
}

.logo__kowa {
  height: 40px;
  width: auto;
  object-fit: contain;
}

.logo__text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.logo:hover {
  transform: translateY(-1px);
}

.logo__main {
  font-family: var(--font-serif);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  line-height: var(--line-height-tight);
}

.logo__sub {
  font-family: var(--font-serif);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent-600);
  line-height: var(--line-height-tight);
  margin-top: -2px;
}

/* Navigation Styles */
.header__nav {
  display: none;
}

@media (min-width: 768px) {
  .header__nav {
    display: block;
  }
}

.nav__list {
  display: flex;
  list-style: none;
  align-items: center;
  gap: var(--spacing-2);
  margin: 0;
  padding: 0;
}

.nav__item {
  position: relative;
}

.nav__link {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) var(--spacing-4);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--radius-lg);
  transition: var(--transition-all);
  position: relative;
  border: none;
  background: none;
  cursor: pointer;
}

.nav__link:hover,
.nav__link:focus {
  background: var(--color-primary-50);
  color: var(--color-primary-700);
  transform: translateY(-1px);
}

.nav__link[aria-current='page'] {
  background: var(--color-primary-100);
  color: var(--color-primary-800);
  font-weight: var(--font-weight-semibold);
}

.nav__icon {
  font-size: var(--font-size-sm);
  opacity: 0.8;
}

.nav__arrow {
  font-size: var(--font-size-xs);
  transition: var(--transition-transform);
}

.nav__dropdown-toggle[aria-expanded='true'] .nav__arrow {
  transform: rotate(180deg);
}

/* Dropdown Menu */
.nav__item--dropdown {
  position: relative;
}

.dropdown {
  display: none;
  position: absolute;
  top: calc(100% + var(--spacing-2));
  left: 0;
  background: var(--color-bg-primary);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-xl);
  min-width: 240px;
  list-style: none;
  padding: var(--spacing-3);
  z-index: var(--z-dropdown);
  opacity: 0;
  transform: translateY(-8px);
  transition: var(--transition-all);
}

.dropdown.show {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

.dropdown__item {
  margin: 0;
}

.dropdown__link {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  padding: var(--spacing-3) var(--spacing-4);
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--radius-lg);
  transition: var(--transition-colors);
  font-size: var(--font-size-base);
}

.dropdown__link:hover,
.dropdown__link:focus {
  background: var(--color-primary-50);
  color: var(--color-primary-700);
}

.dropdown__link i {
  font-size: var(--font-size-sm);
  width: 16px;
  opacity: 0.7;
}

/* Mobile Menu Toggle - 削除済み */

/* Touch target optimization for mobile */
@media (max-width: 767px) {
  .nav__link,
  .btn {
    min-height: 44px;
    display: flex;
    align-items: center;
    padding: var(--spacing-3) var(--spacing-4);
  }
}

/* 768px以上ではモバイルメニュー非表示（削除済み） */

/* Additional Header Styles for Standalone Operation */
.header {
  width: 100%;
}

/* Mobile Menu Overlay */
.mobile-menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: var(--z-modal-backdrop);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.mobile-menu-overlay.show {
  opacity: 1;
  visibility: visible;
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(80vw, 400px);
  height: 100vh;
  background: var(--color-bg-primary);
  box-shadow: -4px 0 20px rgba(0, 0, 0, 0.2);
  z-index: var(--z-modal);
  overflow-y: auto;
  overflow-x: hidden;
  transform: translateX(100%);
  visibility: hidden;
  transition: transform 0.3s ease, visibility 0.3s ease;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 90px;
}

.mobile-menu.show {
  transform: translateX(0);
  visibility: visible;
}

.mobile-menu__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-6);
  border-bottom: 1px solid var(--color-border-light);
  background: var(--color-bg-secondary);
}

.mobile-menu__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}

.mobile-menu__close {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-2);
  font-size: var(--font-size-xl);
  color: var(--color-text);
  transition: var(--transition-colors);
  border-radius: var(--radius-md);
}

.mobile-menu__close:hover {
  background: var(--color-primary-50);
  color: var(--color-primary);
}

.mobile-menu__list {
  list-style: none;
  padding: var(--spacing-4);
  margin: 0;
  /* flex: 1 1 auto;
  min-height: 0; */
}

.mobile-menu__item {
  border-bottom: 1px solid var(--color-border-light);
}

.mobile-menu__item:last-child {
  border-bottom: none;
}

.mobile-menu__link {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
  padding: var(--spacing-4) var(--spacing-6);
  color: var(--color-text);
  text-decoration: none;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  transition: var(--transition-all);
  border-radius: var(--radius-md);
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  cursor: pointer;
}

.mobile-menu__link:hover,
.mobile-menu__link:focus {
  background: var(--color-primary-50);
  color: var(--color-primary);
}

.mobile-menu__link[aria-current='page'] {
  background: var(--color-primary-100);
  color: var(--color-primary-800);
  font-weight: var(--font-weight-semibold);
  border-left: 4px solid var(--color-primary);
}

.mobile-menu__link i {
  font-size: var(--font-size-lg);
  width: 20px;
  flex-shrink: 0;
}

.mobile-menu__arrow {
  margin-left: auto;
  font-size: var(--font-size-sm);
  transition: var(--transition-transform);
}

.mobile-menu__expand-toggle[aria-expanded='true'] .mobile-menu__arrow {
  transform: rotate(180deg);
}

/* Mobile Submenu */
.mobile-submenu {
  display: none;
  list-style: none;
  margin: 0;
  padding: 0;
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border-light);
}

.mobile-submenu.show {
  display: block !important;
}

.mobile-submenu__item {
  margin: 0;
}

.mobile-submenu__link {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
  padding: var(--spacing-3) var(--spacing-6) var(--spacing-3) var(--spacing-10);
  color: var(--color-text-light);
  text-decoration: none;
  font-size: var(--font-size-base);
  transition: var(--transition-colors);
}

.mobile-submenu__link:hover,
.mobile-submenu__link:focus {
  background: var(--color-primary-50);
  color: var(--color-primary);
}

.mobile-submenu__link i {
  font-size: var(--font-size-sm);
  width: 16px;
  flex-shrink: 0;
  opacity: 0.7;
}

/* Mobile Menu CTA */
.mobile-menu__cta {
  padding: var(--spacing-6);
  border-top: 1px solid var(--color-border-light);
  background: var(--color-bg-secondary);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
  /* flex: 0 0 auto; */
}

.mobile-menu__cta .btn {
  width: 100%;
  justify-content: center;
}

/* Hide mobile menu on desktop */
@media (min-width: 768px) {
  .mobile-menu,
  .mobile-menu-overlay {
    display: none !important;
  }
}

/* Touch optimization */
@media (max-width: 767px) {
  .nav__link,
  .btn {
    min-height: 44px;
  }
}