/* ══════════════════════════════════════════════════════════════════
   NAVIGATION — Clean institutional bar, semi-transparent
   ══════════════════════════════════════════════════════════════════ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  background: rgba(10, 22, 40, 0.3);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.nav-logo {
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent);
  white-space: nowrap;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 14px;
}

.nav-cta {
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--color-accent);
  color: var(--color-deep);
  padding: 8px 18px;
  border-radius: 3px;
  min-height: 36px;
  display: inline-flex;
  align-items: center;
  transition: opacity 0.2s;
}

.nav-cta:active { opacity: 0.75; }

.nav-links-desktop { display: none; }

/* ── HAMBURGER ── */

.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px;
  z-index: 110;
}

.hamburger span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--color-text);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.2s;
}

.hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ── MOBILE MENU ── */

.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: var(--color-deep);
  display: flex;
  flex-direction: column;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.3s;
  overflow-y: auto;
}

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

.mobile-menu-close {
  position: fixed;
  top: 8px;
  right: 12px;
  z-index: 110;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mobile-menu-close::before,
.mobile-menu-close::after {
  content: '';
  position: absolute;
  width: 18px;
  height: 1.5px;
  background: var(--color-text);
}

.mobile-menu-close::before { transform: rotate(45deg); }
.mobile-menu-close::after { transform: rotate(-45deg); }

.mobile-menu-inner {
  padding: 72px 28px 36px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.mobile-nav-item {
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 50px;
  padding: 13px 0;
  font-family: var(--font-ui);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  user-select: none;
}

.mobile-nav-link .arrow {
  font-size: 10px;
  transition: transform 0.25s;
  opacity: 0.3;
}

.mobile-nav-item.expanded .arrow { transform: rotate(180deg); }

.mobile-submenu {
  display: none;
  padding: 0 0 8px 14px;
}

.mobile-nav-item.expanded .mobile-submenu { display: block; }

.mobile-submenu a {
  display: flex;
  align-items: center;
  min-height: 42px;
  padding: 7px 0;
  font-size: 14px;
  color: var(--color-text-dim);
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.mobile-submenu a:active { color: var(--color-text); }

.mobile-menu-bottom {
  margin-top: auto;
  padding: 20px 0 12px;
}

.mobile-menu-bottom .nav-cta {
  width: 100%;
  justify-content: center;
  font-size: 13px;
  padding: 13px 24px;
}

/* ── DESKTOP (>= 900px) ── */

@media (min-width: 900px) {
  .nav { padding: 0 40px; }
  .hamburger { display: none; }

  .nav-links-desktop {
    display: flex;
    align-items: center;
    gap: 0;
  }

  .nav-links-desktop > li {
    list-style: none;
    position: relative;
  }

  .nav-links-desktop > li > a,
  .nav-links-desktop > li > .nav-dropdown-toggle {
    font-family: var(--font-ui);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: rgba(226, 221, 211, 0.55);
    padding: 6px 12px;
    border-radius: 3px;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: color 0.2s, background 0.2s;
    white-space: nowrap;
    cursor: pointer;
  }

  .nav-links-desktop > li > a:hover,
  .nav-links-desktop > li > .nav-dropdown-toggle:hover {
    color: var(--color-text);
    background: rgba(255, 255, 255, 0.04);
  }

  .nav-dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: rgba(14, 30, 52, 0.96);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 4px;
    padding: 6px 0;
    min-width: 220px;
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5);
    z-index: 60;
  }

  .nav-links-desktop > li { padding-bottom: 12px; margin-bottom: -12px; }

  .nav-links-desktop > li:hover > .nav-dropdown-menu { display: block; }

  .nav-dropdown-menu a {
    display: block;
    padding: 8px 18px;
    font-size: 13px;
    text-transform: none;
    letter-spacing: 0;
    color: rgba(226, 221, 211, 0.55);
    transition: background 0.15s, color 0.15s;
  }

  .nav-dropdown-menu a:hover {
    background: var(--color-accent-dim);
    color: var(--color-accent);
  }
}