/* ============================================================
   header.css — Site Header
   B.I.Y Corporate Design System
   ============================================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-header);
  background-color: transparent;
  transition: background-color var(--transition-base), padding var(--transition-base), box-shadow var(--transition-base);
  padding: 24px 0;
}

.site-header__inner {
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 40px;
}

/* Scrolled state */
.site-header.is-scrolled {
  background-color: rgba(15, 37, 71, 0.96);
  padding: 14px 0;
  box-shadow: 0 6px 24px rgba(8, 20, 39, 0.32);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.site-header.is-scrolled .site-logo__img { height: 30px; }
.site-header.is-scrolled .site-logo__tag { font-size: 8.5px; margin-top: 4px; }

/* When the body has the navy hero, header sits semi-transparent over it */
body:not(.has-light-header) .site-header {
  background-color: rgba(8, 20, 39, 0.6);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border-bottom: 1px solid rgba(200, 168, 74, 0.08);
}

body:not(.has-light-header) .site-header.is-scrolled {
  background-color: rgba(8, 20, 39, 0.94);
  box-shadow: 0 6px 24px rgba(8, 20, 39, 0.32);
  border-bottom-color: rgba(200, 168, 74, 0.12);
}

body.has-light-header .site-header {
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 1px 0 rgba(15, 37, 71, 0.06);
}

body.has-light-header .site-header.is-scrolled {
  background-color: rgba(255, 255, 255, 0.98);
  box-shadow: 0 6px 24px rgba(15, 37, 71, 0.06);
}

/* ── Logo ──────────────────────────────────────────────── */
.site-logo {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1;
  color: var(--color-white);
  transition: opacity var(--transition-fast);
}

.site-logo__img {
  display: block;
  height: 36px;
  width: auto;
  /* Convert dark logo PNG → white on navy header */
  filter: brightness(0) invert(1);
  transition: filter var(--transition-base);
}

.site-logo__tag {
  font-family: var(--font-serif-en);
  font-size: 9.5px;
  font-weight: var(--fw-regular);
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin-top: 6px;
}

/* On light header (non-navy-hero pages, scrolled-light state) keep logo dark */
body.has-light-header .site-logo__img {
  filter: none;
}

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

/* ── Nav ──────────────────────────────────────────────── */
.site-nav {
  justify-self: center;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 36px;
}

.site-nav__link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  position: relative;
  padding: 8px 0;
  color: var(--color-white);
  transition: color var(--transition-fast);
}

body.has-light-header .site-nav__link {
  color: var(--color-navy);
}

.site-nav__en {
  font-family: var(--font-serif-en);
  font-size: 14px;
  font-weight: var(--fw-medium);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  line-height: 1;
}

.site-nav__ja {
  font-family: var(--font-sans-ja);
  font-size: 10px;
  font-weight: var(--fw-regular);
  letter-spacing: 0.1em;
  line-height: 1;
  opacity: 0.7;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 1px;
  background: var(--color-gold);
  transition: width var(--transition-base);
}

.site-nav__link:hover { color: var(--color-gold); }
.site-nav__link:hover::after { width: 100%; }

.site-nav__link--feature {
  padding: 10px 18px;
  border: 1px solid var(--color-gold);
}

.site-nav__link--feature::after { display: none; }

.site-nav__link--feature:hover {
  background: var(--color-gold);
  color: var(--color-white) !important;
}

body.has-light-header .site-nav__link--feature {
  color: var(--color-gold);
}

/* Dropdown */
.site-nav__item--has-dropdown {
  position: relative;
  padding-bottom: 16px; /* extend hover zone downward */
  margin-bottom: -16px;
}

/* Transparent bridge below parent link, so hover never breaks */
.site-nav__item--has-dropdown::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  min-width: 220px;
  height: 16px;
  background: transparent;
}

.site-nav__dropdown {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  min-width: 240px;
  background: var(--color-white);
  padding: 12px 0;
  border-top: 2px solid var(--color-gold);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transition-base), transform var(--transition-base);
  z-index: 2;
}

.site-nav__item--has-dropdown:hover .site-nav__dropdown,
.site-nav__item--has-dropdown:focus-within .site-nav__dropdown,
.site-nav__item--has-dropdown.is-open .site-nav__dropdown {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.site-nav__dropdown-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 28px;
  font-size: var(--fs-sm);
  color: var(--color-navy);
  font-family: var(--font-sans-ja);
  letter-spacing: 0.04em;
  transition: background-color var(--transition-fast), color var(--transition-fast), padding-left var(--transition-fast);
  position: relative;
}

.site-nav__dropdown-link::after {
  content: "→";
  font-family: var(--font-sans-en);
  font-size: 12px;
  color: var(--color-gold);
  opacity: 0;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.site-nav__dropdown-link:hover {
  background: var(--color-bg-cream);
  color: var(--color-gold);
  padding-left: 36px;
}

.site-nav__dropdown-link:hover::after { opacity: 1; transform: translateX(4px); }

/* ── Header CTA ───────────────────────────────────────── */
.site-header__cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 26px;
  background-color: var(--color-gold);
  color: var(--color-white);
  font-family: var(--font-sans-ja);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  letter-spacing: var(--tracking-wider);
  line-height: 1;
  transition: background-color var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
}

.site-header__cta::after {
  content: "→";
  font-family: var(--font-sans-en);
  transition: transform var(--transition-base);
}

.site-header__cta:hover {
  background-color: var(--color-gold-soft);
  transform: translateY(-2px);
  box-shadow: var(--shadow-gold);
}

.site-header__cta:hover::after {
  transform: translateX(4px);
}

/* ── Hamburger ────────────────────────────────────────── */
.hamburger {
  display: none;
  width: 44px;
  height: 44px;
  position: relative;
  z-index: calc(var(--z-modal) + 1);
}

.hamburger__line {
  display: block;
  width: 28px;
  height: 1.5px;
  background: var(--color-white);
  margin: 6px auto;
  transition: transform var(--transition-base), opacity var(--transition-base), background-color var(--transition-base);
}

body.has-light-header:not(.nav-open) .hamburger__line {
  background: var(--color-navy);
}

.nav-open .hamburger .hamburger__line:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
  background: var(--color-white);
}
.nav-open .hamburger .hamburger__line:nth-child(2) { opacity: 0; }
.nav-open .hamburger .hamburger__line:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
  background: var(--color-white);
}

/* ── Nav Overlay (mobile) ─────────────────────────────── */
.nav-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  background: var(--color-navy-deep);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
  overflow-y: auto;
}

.nav-overlay::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(135deg, rgba(200, 168, 74, 0.06) 0%, transparent 60%);
  pointer-events: none;
}

.nav-open .nav-overlay {
  opacity: 1;
  visibility: visible;
}

.nav-overlay__nav {
  position: relative;
  z-index: 1;
  max-width: 480px;
  margin: 0 auto;
  padding: 120px 32px 60px;
}

.nav-overlay__list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-overlay__link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 22px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--color-white);
  transition: padding-left var(--transition-fast), color var(--transition-fast);
}

.nav-overlay__link:hover {
  padding-left: 8px;
  color: var(--color-gold);
}

.nav-overlay__en {
  font-family: var(--font-serif-en);
  font-size: var(--fs-2xl);
  letter-spacing: 0.06em;
  font-weight: var(--fw-medium);
  line-height: 1;
}

.nav-overlay__ja {
  font-family: var(--font-sans-ja);
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-wider);
  color: rgba(255, 255, 255, 0.6);
}

.nav-overlay__link--feature .nav-overlay__en { color: var(--color-gold); }

.nav-overlay__cta {
  margin-top: 40px;
}

.nav-overlay__contact {
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
}

.nav-overlay__contact-label {
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-wider);
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 12px;
}

.nav-overlay__contact-tel {
  display: block;
  font-family: var(--font-serif-en);
  font-size: 28px;
  color: var(--color-gold);
  letter-spacing: 0.04em;
  font-weight: var(--fw-medium);
  margin-bottom: 8px;
}

.nav-overlay__contact-hours {
  font-size: var(--fs-xs);
  color: rgba(255, 255, 255, 0.5);
}