/* ── Site Header ────────────────────────────────────────────────────────── */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: transparent;
  border-bottom: 1px solid transparent;
  height: var(--nav-height);
  transition:
    background-color var(--transition-normal),
    border-color var(--transition-normal),
    backdrop-filter var(--transition-normal);
}

.site-header.header--scrolled {
  background-color: rgba(13, 17, 23, 0.9);
  border-bottom: 1px solid rgba(122, 198, 166, 0.18);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* ── Logo ───────────────────────────────────────────────────────────────── */

.site-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}

.site-logo img {
  height: 40px;
  width: auto;
}

/* ── Nav ────────────────────────────────────────────────────────────────── */

#main-nav {
  display: none;
}

#main-nav.is-open {
  display: block;
  position: fixed;
  inset: var(--nav-height) 0 0 0;
  background-color: var(--color-bg);
  overflow-y: auto;
  padding: var(--space-6);
  border-top: 1px solid var(--color-border);
  z-index: 99;
}

@media (min-width: 1024px) {
  #main-nav,
  #main-nav.is-open {
    display: flex;
    position: static;
    inset: unset;
    background: none;
    overflow: visible;
    padding: 0;
    border: none;
  }
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

@media (min-width: 1024px) {
  .nav-list {
    flex-direction: row;
    align-items: center;
    gap: var(--space-1);
  }
}

.nav-list > li > a {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-weight: 500;
  font-size: var(--text-sm);
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-list > li > a:hover {
  color: var(--color-accent);
  background-color: var(--color-bg-subtle);
}

.nav-list > li > a[aria-current="page"] {
  color: var(--color-accent);
  font-weight: 600;
}

/* CTA nav item */
.nav-cta-item { margin-left: var(--space-2); }

/* Restore correct btn-primary color — nav link selector has higher specificity */
.nav-cta-item .btn-primary { color: #000; }
.nav-cta-item .btn-primary:hover { color: var(--color-accent); }
.nav-cta-item .btn-primary[aria-current="page"] { color: #000; }

@media (max-width: 1023px) {
  .nav-cta-item { margin-top: var(--space-4); }
  .nav-cta-item .btn { width: 100%; justify-content: center; }
}

/* ── Dropdown ───────────────────────────────────────────────────────────── */

.has-dropdown {
  position: relative;
}

.nav-list > li > a.dropdown-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.dropdown-arrow {
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  transition: transform var(--transition-fast);
  margin-top: 1px;
  flex-shrink: 0;
}

.dropdown-menu {
  background-color: var(--color-bg);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.dropdown-menu a {
  display: block;
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

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

/* Mobile: sub-items always visible, indented under parent */
@media (max-width: 1023px) {
  .dropdown-arrow { display: none; }
  .dropdown-menu a { padding-left: var(--space-8); }
}

/* Desktop: hover-intent dropdown */
@media (min-width: 1024px) {
  /* Invisible bridge fills the gap so hover isn't lost mid-travel */
  .has-dropdown::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    height: var(--space-2);
  }

  .dropdown-menu {
    position: absolute;
    top: calc(100% + var(--space-2));
    left: 0;
    min-width: 220px;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    z-index: 101;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 150ms ease, visibility 0s 200ms;
  }

  .has-dropdown:hover .dropdown-menu,
  .has-dropdown:focus-within .dropdown-menu {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transition: opacity 150ms ease, visibility 0s;
  }

  .has-dropdown:hover .dropdown-arrow,
  .has-dropdown:focus-within .dropdown-arrow {
    transform: rotate(180deg);
  }

  .dropdown-menu a {
    padding: var(--space-3) var(--space-4);
  }

  .dropdown-menu a:hover { background-color: var(--color-bg-subtle); }
}

/* ── Mobile hamburger ───────────────────────────────────────────────────── */

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 20px;
  padding: 0;
  flex-shrink: 0;
}

@media (min-width: 1024px) {
  .nav-toggle { display: none; }
}

.hamburger-bar {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.nav-toggle[aria-expanded="true"] .hamburger-bar:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .hamburger-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .hamburger-bar:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}