/* ===== Navigation ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: background var(--transition), border-color var(--transition);
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background: rgba(10,10,15,0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom-color: var(--color-border);
}

.nav__inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav__logo-name {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 900;
  letter-spacing: 0.05em;
  color: var(--color-text);
  text-transform: uppercase;
}

.nav__logo-name span {
  color: var(--color-accent);
}

.nav__logo-sub {
  font-family: var(--font-ja);
  font-size: 0.6rem;
  color: var(--color-text-muted);
  letter-spacing: 0.15em;
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav__item {
  position: relative;
}

.nav__link {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  transition: color var(--transition);
  padding: 0.5rem 0;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.nav__link:hover,
.nav__link.active {
  color: var(--color-text);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-accent);
  transition: width var(--transition);
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

/* Dropdown */
.nav__dropdown {
  position: absolute;
  top: calc(100% + 1rem);
  left: 50%;
  transform: translateX(-50%);
  min-width: 220px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 0.75rem 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  transform: translateX(-50%) translateY(-8px);
  box-shadow: var(--shadow-md);
}

.nav__item:hover .nav__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav__dropdown-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 1.25rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  transition: all var(--transition);
}

.nav__dropdown-link:hover {
  background: rgba(255,255,255,0.04);
  color: var(--color-text);
  padding-left: 1.5rem;
}

.nav__dropdown-link .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav__lang {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--color-border);
  border-radius: 2px;
  transition: all var(--transition);
}

.nav__lang:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  cursor: pointer;
}

.nav__hamburger span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--color-text);
  transition: all var(--transition);
}

/* Mobile Nav */
.nav__mobile {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(10,10,15,0.98);
  backdrop-filter: blur(30px);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
}

.nav__mobile.open {
  display: flex;
}

.nav__mobile-link {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  text-transform: uppercase;
  transition: color var(--transition);
}

.nav__mobile-link:hover {
  color: var(--color-accent);
}

.nav__mobile-close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  font-size: 1.5rem;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: color var(--transition);
}

.nav__mobile-close:hover {
  color: var(--color-text);
}

@media (max-width: 1024px) {
  .nav__menu { display: none; }
  .nav__hamburger { display: flex; }
  .nav__lang { display: none; }
}