/* Header layout */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: #050506;
  border-bottom: 1px solid rgba(148, 163, 184, 0.12);
  box-shadow: 0 1px 0 rgba(148, 163, 184, 0.2);
}

.header-shell {
  width: min(92%, 1200px);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(0.75rem, 2vw, 2.5rem);
  padding: 1rem 0;
}

/* Navigation */
.primary-nav {
  display: flex;
  align-items: center;
  gap: clamp(0.9rem, 2vw, 1.4rem);
  margin-right: auto;
  flex: 1;
}

.nav-link--home {
  font-weight: 700;
  color: #f8fafc;
  margin-right: clamp(1.5rem, 5vw, 3rem);
}

.primary-nav__center {
  display: flex;
  align-items: center;
  gap: clamp(0.9rem, 2vw, 1.9rem);
  justify-content: center;
  flex: 1;
}

.nav-item {
  position: relative;
  display: flex;
  align-items: center;
}

.nav-link--toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.nav-link {
  position: relative;
  color: #e5e7eb;
  font-weight: 600;
  font-size: 0.98rem;
  letter-spacing: 0.01em;
  padding: 0.25rem 0;
  transition: color 0.2s ease;
}

.nav-link__icon {
  font-size: 0.75rem;
  transition: transform 0.2s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: #f8fafc;
  opacity: 0;
  transform: scaleX(0.4);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: #f8fafc;
}

.nav-link:hover::after,
.nav-link:focus-visible::after {
  opacity: 1;
  transform: scaleX(1);
}

.nav-item.is-open > .nav-link--toggle .nav-link__icon {
  transform: rotate(-180deg);
}

@media (hover: hover) {
  .nav-item:hover > .nav-link--toggle .nav-link__icon {
    transform: rotate(-180deg);
  }
}

.nav-dropdown[hidden] {
  display: none;
}

.nav-dropdown {
  position: absolute;
  top: calc(100% + 12px);
  left: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  min-width: 220px;
  padding: 1rem 1.15rem;
  background: rgba(5, 7, 13, 0.94);
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 18px;
  box-shadow: 0 24px 48px rgba(2, 6, 23, 0.35);
  opacity: 0;
  transform: translateY(6px);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 1100;
}

.nav-item.is-open > .nav-dropdown,
.nav-item:focus-within > .nav-dropdown {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

@media (hover: hover) {
  .nav-item:hover > .nav-dropdown {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }
}

.nav-dropdown__link {
  color: #f8fafc;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.35rem 0;
  transition: color 0.2s ease;
}

.nav-dropdown__link:hover,
.nav-dropdown__link:focus-visible {
  color: #93c5fd;
}

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

.header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.35rem;
  border-radius: 9999px;
  background: #f8fafc;
  color: #050506;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.header-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 28px rgba(15, 23, 42, 0.25);
}

.header-cta:focus-visible {
  outline: 2px solid #f8fafc;
  outline-offset: 3px;
}

/* Hamburger (mobile) */
.hamburger {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  background: transparent;
  color: #f8fafc;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.hamburger-box {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
}

.hamburger-inner,
.hamburger-inner::before,
.hamburger-inner::after {
  content: "";
  display: block;
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.25s ease, opacity 0.2s ease;
}

.hamburger-inner::before { transform: translateY(-6px); }
.hamburger-inner::after { transform: translateY(6px); }

.hamburger[aria-expanded="true"] .hamburger-inner {
  transform: rotate(45deg);
}

.hamburger[aria-expanded="true"] .hamburger-inner::before {
  transform: rotate(90deg);
}

.hamburger[aria-expanded="true"] .hamburger-inner::after {
  opacity: 0;
}

/* Mobile menu panel */
.mobile-menu[hidden] { display: none !important; }

.mobile-menu {
  border-bottom: 1px solid rgba(148, 163, 184, 0.12);
  background: #050506;
  box-shadow: 0 18px 38px rgba(15, 23, 42, 0.25);
}

.mobile-nav {
  width: min(92%, 1100px);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.05rem 0 1.35rem;
}

.mobile-link {
  color: #f8fafc;
  font-weight: 600;
  padding: 0.7rem 0;
  border-bottom: 1px solid rgba(148, 163, 184, 0.1);
}

.mobile-link--summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  list-style: none;
}

.mobile-link--summary::-webkit-details-marker {
  display: none;
}

.mobile-link--summary::after {
  content: "▾";
  font-size: 0.75rem;
  transition: transform 0.2s ease;
}

.mobile-group[open] > .mobile-link--summary::after {
  transform: rotate(-180deg);
}

.mobile-group {
  border-bottom: 1px solid rgba(148, 163, 184, 0.1);
  padding: 0.15rem 0;
}

.mobile-group:last-of-type {
  border-bottom: 1px solid rgba(148, 163, 184, 0.1);
}

.mobile-subnav {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0.4rem 0 0.6rem 0.75rem;
  border-left: 1px solid rgba(148, 163, 184, 0.25);
  margin-left: 0.35rem;
}

.mobile-sublink {
  color: rgba(248, 250, 252, 0.85);
  font-weight: 500;
  padding: 0.35rem 0;
  border-bottom: 0;
}

.mobile-link:last-child {
  border-bottom: 0;
}

.mobile-link--cta {
  margin-top: 0.8rem;
  border-radius: 14px;
  background: #f8fafc;
  color: #050506;
  text-align: center;
}

/* Responsive */
@media (max-width: 980px) {
  .primary-nav {
    display: none;
  }

  .header-cta {
    display: none;
  }

  .hamburger {
    display: inline-flex;
  }
}

/* Prevent scroll when mobile menu open */
body.no-scroll { overflow: hidden; }