/* ===========================================
   Header — Sticky Navigation
   =========================================== */

.site-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid transparent;
  padding-top: var(--safe-top);
  padding-left: var(--safe-left);
  padding-right: var(--safe-right);
  transition:
    background-color var(--duration-base) var(--ease-out),
    border-color var(--duration-base) var(--ease-out),
    box-shadow var(--duration-base) var(--ease-out);
}

/* Safari の backdrop-filter 非対応時のフォールバック */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .site-header {
    background-color: rgba(255, 255, 255, 0.97);
  }
}

.site-header.is-scrolled {
  background-color: rgba(255, 255, 255, 0.95);
  border-bottom-color: var(--color-border);
  box-shadow: 0 4px 20px rgba(0, 99, 138, 0.06);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 0.625rem;
  gap: var(--space-2);
  min-height: 60px;
}

@media (min-width: 768px) {
  .site-header__inner {
    padding-block: var(--space-2);
    gap: var(--space-3);
  }
}

.site-header__logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: 'Cormorant Garamond', 'Times New Roman', serif;
  font-size: 1.5rem;
  font-weight: 600;
  color: #22BEF0;
  letter-spacing: -0.005em;
  flex-shrink: 0;
  min-height: var(--tap-min);
  text-decoration: none;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.site-header__logo:hover {
  opacity: 0.85;
}

@media (min-width: 768px) {
  .site-header__logo {
    font-size: 1.75rem;
    gap: 0.625rem;
  }
}

.site-header__logo-mark {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  display: block;
  transition: transform var(--duration-base) var(--ease-out);
}

.site-header__logo:hover .site-header__logo-mark {
  transform: rotate(-4deg) scale(1.04);
}

@media (min-width: 768px) {
  .site-header__logo-mark {
    width: 38px;
    height: 38px;
  }
}

.site-header__logo-text {
  display: inline-block;
  line-height: 1;
}

/* ---------- Desktop Nav ---------- */
.site-nav {
  display: none;
}

/* タブレット幅 (768-1023px)：言語切替だけ見せる */
@media (min-width: 768px) {
  .site-nav {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-left: auto; /* logoとmenu-toggleの間で右寄せ */
  }

  /* タブレットではナビリンクとCTAは隠す（ハンバーガー経由） */
  .site-nav__list,
  .site-nav > .btn {
    display: none;
  }
}

@media (min-width: 1024px) {
  .site-nav {
    gap: var(--space-4);
  }

  .site-nav__list {
    display: flex;
  }

  .site-nav > .btn {
    display: inline-flex;
  }
}

.site-nav__list {
  display: flex;
  gap: var(--space-3);
  align-items: center;
}

.site-nav__link {
  font-size: var(--fs-small);
  font-weight: var(--fw-medium);
  color: var(--color-text);
  padding: var(--space-1) var(--space-1);
  position: relative;
  transition: color var(--duration-fast) var(--ease-out);
}

.site-nav__link::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 2px;
  background-color: var(--color-accent-sky);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--duration-base) var(--ease-out);
}

.site-nav__link:hover {
  color: var(--color-accent-sky);
}

.site-nav__link:hover::after {
  transform: scaleX(1);
}

/* ---------- Lang Switch ---------- */
.lang-switch {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--fs-small);
  font-weight: var(--fw-semibold);
}

.lang-switch__link {
  padding: 0.25rem 0.5rem;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  transition: color var(--duration-fast) var(--ease-out);
}

.lang-switch__link:hover {
  color: var(--color-text);
}

.lang-switch__link.is-active {
  color: var(--color-text);
  background-color: var(--color-bg-soft);
}

.lang-switch__sep {
  color: var(--color-border);
}

/* ---------- Mobile Toggle ---------- */
.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background-color: transparent;
  position: relative;
  z-index: calc(var(--z-modal) + 1);
}

@media (min-width: 1024px) {
  .menu-toggle {
    display: none;
  }
}

.menu-toggle__bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  position: relative;
  transition: background-color var(--duration-fast) var(--ease-out);
}

.menu-toggle__bar::before,
.menu-toggle__bar::after {
  content: '';
  position: absolute;
  left: 0;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  transition: transform var(--duration-base) var(--ease-out);
}

.menu-toggle__bar::before {
  top: -8px;
}

.menu-toggle__bar::after {
  top: 8px;
}

.menu-toggle.is-open .menu-toggle__bar {
  background-color: transparent;
}

.menu-toggle.is-open .menu-toggle__bar::before {
  transform: translateY(8px) rotate(45deg);
}

.menu-toggle.is-open .menu-toggle__bar::after {
  transform: translateY(-8px) rotate(-45deg);
}

/* ============================================================
   Mobile Menu — 右側ドロワー（画面の約78%幅）+ 左側に暗幕
   ============================================================ */

/* Backdrop（左側のタップで閉じる暗幕） */
.mobile-menu-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 30, 50, 0.5);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  z-index: calc(var(--z-modal) - 1);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration-base) var(--ease-out), visibility var(--duration-base);
  cursor: pointer;
}

.mobile-menu-backdrop.is-open {
  opacity: 1;
  visibility: visible;
}

@media (min-width: 1024px) {
  .mobile-menu-backdrop {
    display: none;
  }
}

.mobile-menu {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 78%;
  max-width: 360px;
  background:
    radial-gradient(ellipse 80% 60% at 80% 10%, rgba(34, 190, 240, 0.12) 0%, transparent 60%),
    radial-gradient(ellipse 70% 50% at 10% 90%, rgba(179, 210, 53, 0.06) 0%, transparent 60%),
    linear-gradient(180deg, #003D54 0%, #00638A 100%);
  color: var(--color-base);
  z-index: var(--z-modal);
  display: flex;
  flex-direction: column;
  padding-top: calc(var(--space-10) + var(--safe-top));
  padding-right: calc(var(--space-4) + var(--safe-right));
  padding-bottom: calc(var(--space-5) + var(--safe-bottom));
  padding-left: calc(var(--space-4) + var(--safe-left));
  transform: translateX(100%);
  transition: transform var(--duration-base) var(--ease-out);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  visibility: hidden;
  box-shadow: -10px 0 36px rgba(0, 0, 0, 0.28);
}

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

@media (min-width: 1024px) {
  .mobile-menu {
    display: none;
  }
}

/* ---------- Close button (×) inside menu ---------- */
.mobile-menu__close {
  position: absolute;
  top: calc(var(--space-3) + var(--safe-top));
  right: calc(var(--space-4) + var(--safe-right));
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.22);
  color: var(--color-base);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--ease-out), transform var(--duration-fast) var(--ease-out);
  -webkit-tap-highlight-color: transparent;
}

.mobile-menu__close:hover {
  background: rgba(255, 255, 255, 0.16);
  transform: scale(1.05);
}

.mobile-menu__close:active {
  transform: scale(0.96);
}

.mobile-menu__close svg {
  display: block;
}

/* ---------- Top CTA (お問い合わせ) ---------- */
.mobile-menu__cta {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.125rem 1.5rem;
  margin-bottom: var(--space-5);
  background: linear-gradient(135deg, #B3D235 0%, #9BB832 100%);
  color: var(--color-text);
  font-family: var(--font-heading);
  font-size: 1.0625rem;
  font-weight: 800;
  text-align: center;
  border-radius: var(--radius-pill);
  box-shadow:
    0 10px 28px rgba(179, 210, 53, 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.4);
  text-decoration: none;
  letter-spacing: 0.03em;
  min-height: 56px;
  white-space: nowrap;
  transition: transform var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out);
}

.mobile-menu__cta:hover {
  transform: translateY(-2px);
  box-shadow:
    0 14px 36px rgba(179, 210, 53, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.mobile-menu__cta:active {
  transform: translateY(0);
}

/* ---------- Menu list ---------- */
.mobile-menu__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.mobile-menu__link {
  display: block;
  padding: 0.875rem 0.25rem;
  font-family: var(--font-heading);
  font-size: 1.1875rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.95);
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  text-decoration: none;
  letter-spacing: -0.005em;
  transition: color var(--duration-fast) var(--ease-out), padding-left var(--duration-fast) var(--ease-out);
  min-height: var(--tap-min);
}

.mobile-menu__link:hover,
.mobile-menu__link:focus-visible {
  color: var(--color-accent-sky);
  padding-left: 0.625rem;
}

.mobile-menu__link:active {
  color: var(--color-accent-lime);
}

/* ---------- Lang switch inside menu ---------- */
.mobile-menu .lang-switch {
  margin-top: var(--space-4);
  margin-bottom: var(--space-3);
  align-self: flex-start;
}

.mobile-menu .lang-switch__link {
  color: rgba(255, 255, 255, 0.65);
  font-weight: 600;
}

.mobile-menu .lang-switch__link.is-active {
  color: var(--color-base);
  background: rgba(255, 255, 255, 0.12);
}

.mobile-menu .lang-switch__link:hover {
  color: var(--color-accent-sky);
}

.mobile-menu .lang-switch__sep {
  color: rgba(255, 255, 255, 0.3);
}

/* ---------- Contact block at bottom ---------- */
.mobile-menu__contact {
  margin-top: auto;
  padding-top: var(--space-4);
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.mobile-menu__contact-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.mobile-menu__contact-label {
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent-lime);
}

.mobile-menu__contact-value {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-base);
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: color var(--duration-fast) var(--ease-out);
}

.mobile-menu__contact-value:hover {
  color: var(--color-accent-sky);
}