/* ═══════════════════════════════════════════
   NAV.CSS — Navigation · Hamburger · Mobile Menu
   LOCAL CORE
═══════════════════════════════════════════ */

/* ── Main Nav ── */
nav#main-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 2rem var(--pad-x);
  transition: background 0.5s, padding 0.4s, border-color 0.5s;
  border-bottom: 1px solid transparent;
}
nav#main-nav.scrolled {
  background: rgba(245,243,238,0.93);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  padding: 1.3rem var(--pad-x);
  border-bottom-color: var(--rule);
}

/* ── Logo ── */
.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  transition: opacity 0.2s;
}
.nav-logo:hover { opacity: 0.72; }

.nav-logo-mark {
  width: 26px;
  height: 35px;
  flex-shrink: 0;
  display: block;
}

.nav-logo-text {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink);
  line-height: 1;
}

/* Footer logo */
.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  text-decoration: none;
  transition: opacity 0.2s;
  margin-bottom: 1.2rem;
}
.footer-logo:hover { opacity: 0.72; }
.footer-logo-mark { width: 24px; height: 32px; flex-shrink: 0; display: block; }
.footer-logo-text {
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink);
  line-height: 1;
}

/* ── Desktop Links ── */
.nav-links {
  display: flex;
  gap: 2.8rem;
  list-style: none;
}
.nav-links a {
  font-size: 0.9rem;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mid);
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  position: relative;
  transition: color 0.2s;
}
.nav-links a .nav-ja {
  font-family: var(--font-jp);
  font-size: 0.9rem;
  font-weight: 200;
  letter-spacing: 0.12em;
  text-transform: none;
  color: var(--faint);
  transition: color 0.2s;
  line-height: 1;
}
.nav-links a:hover           { color: var(--ink); }
.nav-links a:hover .nav-ja   { color: var(--mid); }
.nav-links a.active          { color: var(--ink); }
.nav-links a.active .nav-ja  { color: var(--mid); }
.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0; right: 0;
  height: 1px;
  background: var(--accent);
}

/* ── Contact CTA ── */
.nav-cta {
  font-size: 0.9rem;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  border-bottom: 1px solid var(--ink);
  padding-bottom: 1px;
  transition: color 0.25s, border-color 0.25s;
}
.nav-cta:hover { color: var(--accent); border-color: var(--accent); }

/* ── Hamburger Button ── */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  padding: 4px;
  cursor: pointer;
  z-index: 300;
  position: relative;
}
.nav-hamburger span {
  display: block;
  height: 1px;
  background: var(--ink);
  transform-origin: center;
  transition:
    transform 0.38s var(--ease-out),
    opacity 0.25s ease,
    width 0.3s ease;
}
.nav-hamburger span:nth-child(1) { width: 24px; }
.nav-hamburger span:nth-child(2) { width: 16px; margin-left: auto; }
.nav-hamburger.open span:nth-child(1) {
  width: 22px;
  transform: translateY(6px) rotate(45deg);
}
.nav-hamburger.open span:nth-child(2) {
  width: 22px;
  margin-left: auto;
  transform: translateY(-6px) rotate(-45deg);
}

/* ── Mobile Overlay Menu ── */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 250;
  background: var(--cream);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 6rem var(--pad-x-sm) 4rem;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-12px);
  transition:
    opacity 0.45s var(--ease-out),
    transform 0.45s var(--ease-out);
}
.mobile-menu::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--accent) 40px, var(--rule) 40px);
}
.mobile-menu.open {
  opacity: 1;
  pointer-events: all;
  transform: none;
}

.mobile-menu-close {
  position: absolute;
  top: 1.6rem; right: 1.5rem;
  width: 44px; height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  cursor: pointer;
}
.mobile-menu-close span {
  position: absolute;
  width: 22px;
  height: 1px;
  background: var(--ink);
  transition: background 0.2s;
}
.mobile-menu-close span:nth-child(1) { transform: rotate(45deg); }
.mobile-menu-close span:nth-child(2) { transform: rotate(-45deg); }
.mobile-menu-close:hover span { background: var(--accent); }

.mobile-menu-label {
  font-size: 0.9rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--faint);
  font-weight: 400;
  margin-bottom: 3rem;
}

.mobile-nav-list {
  list-style: none;
  margin-bottom: 4rem;
}
.mobile-nav-list li {
  border-bottom: 1px solid var(--rule);
  transform: translateY(20px);
  opacity: 0;
  transition:
    transform 0.5s var(--ease-out),
    opacity 0.5s var(--ease-out);
}
.mobile-menu.open .mobile-nav-list li:nth-child(1) { transition-delay: 0.06s; }
.mobile-menu.open .mobile-nav-list li:nth-child(2) { transition-delay: 0.12s; }
.mobile-menu.open .mobile-nav-list li:nth-child(3) { transition-delay: 0.18s; }
.mobile-menu.open .mobile-nav-list li:nth-child(4) { transition-delay: 0.24s; }
.mobile-menu.open .mobile-nav-list li:nth-child(5) { transition-delay: 0.30s; }
.mobile-menu.open .mobile-nav-list li {
  transform: none;
  opacity: 1;
}

.mobile-nav-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 8vw, 3rem);
  font-weight: 300;
  letter-spacing: -0.01em;
  color: var(--ink);
  transition: color 0.2s;
}
.mobile-nav-list a:hover { color: var(--accent); }
.mobile-nav-list a.active { color: var(--ink); }

.mobile-nav-list .mn-left {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.mobile-nav-list .mn-ja {
  font-family: var(--font-jp);
  font-size: 0.9rem;
  font-weight: 200;
  letter-spacing: 0.14em;
  color: var(--faint);
  transition: color 0.2s;
  line-height: 1;
}
.mobile-nav-list a:hover .mn-ja { color: var(--mid); }
.mobile-nav-list a.active .mn-ja { color: var(--mid); }

.mobile-nav-list .mn-arr {
  font-family: var(--font-body);
  font-size: 1.0rem;
  letter-spacing: 0.1em;
  color: var(--faint);
  font-weight: 300;
  align-self: center;
  transition: transform 0.25s, color 0.2s;
}
.mobile-nav-list a:hover .mn-arr {
  transform: translateX(4px);
  color: var(--accent);
}

.mobile-menu-footer {
  font-family: var(--font-jp);
  font-size: 0.9rem;
  font-weight: 200;
  color: var(--faint);
  line-height: 2.2;
  margin-top: auto;
  opacity: 0;
  transition: opacity 0.4s ease 0.35s;
}
.mobile-menu.open .mobile-menu-footer { opacity: 1; }

/* ── Responsive ── */
@media (max-width: 960px) {
  nav#main-nav {
    padding: 1.4rem var(--pad-x-sm);
  }
  nav#main-nav.scrolled {
    padding: 1rem var(--pad-x-sm);
  }
  .nav-links,
  .nav-cta    { display: none; }
  .nav-hamburger { display: flex; }
}

/* ── Dark hero pages: white logo & links when not scrolled ── */
nav#main-nav.nav--on-dark .nav-logo {
  color: var(--white);
}
nav#main-nav.nav--on-dark .nav-logo-text {
  color: var(--white);
}
nav#main-nav.nav--on-dark .nav-links a {
  color: rgba(255,255,255,0.55);
}
nav#main-nav.nav--on-dark .nav-links a .nav-ja {
  color: rgba(255,255,255,0.3);
}
nav#main-nav.nav--on-dark .nav-links a:hover,
nav#main-nav.nav--on-dark .nav-links a.active {
  color: var(--white);
}
nav#main-nav.nav--on-dark .nav-cta {
  color: var(--white);
  border-bottom-color: var(--white);
}
nav#main-nav.nav--on-dark .nav-hamburger span {
  background: var(--white);
}