/* ─────────────────────────────────────────────────────────────
   HEADER
───────────────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(11, 16, 26, 0.82);
  backdrop-filter: blur(22px) saturate(160%);
  -webkit-backdrop-filter: blur(22px) saturate(160%);
  border-bottom: 1px solid var(--border-soft);
}

/* Glowing accent line across the bottom of header */
.site-header::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg,
    transparent 0%,
    var(--cyan) 30%,
    var(--blue) 70%,
    transparent 100%);
  opacity: 0.35;
}

/* Scrolled state — deeper glass + depth shadow */
.site-header.is-scrolled {
  background: rgba(11, 16, 26, 0.96);
  backdrop-filter: blur(28px) saturate(180%);
  -webkit-backdrop-filter: blur(28px) saturate(180%);
  box-shadow:
    0 1px 0 var(--border-soft),
    0 4px 32px rgba(0, 0, 0, 0.55),
    0 0 60px rgba(0, 0, 0, 0.35);
  transition:
    background var(--ease-base),
    backdrop-filter var(--ease-base),
    box-shadow var(--ease-base);
}

.site-header-inner {
  max-width: var(--wide-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  height: 80px;
  display: flex;
  align-items: stretch;
  gap: var(--s5);
}

/* Branding */
.site-branding {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.site-branding-link {
  display: flex;
  align-items: center;
  gap: var(--s3);
  text-decoration: none;
}

.site-branding .site-logo {
  height: 40px;
  width: auto;
  max-width: 180px;
  display: block;
  flex-shrink: 0;
}

@media (max-width: 480px) {
  .site-branding .site-logo { height: 30px; }
}

.site-title {
  font-family: 'Nunito', sans-serif;
  font-size: clamp(1.04rem, 2.5vw, 1.33rem);
  font-weight: 900;
  letter-spacing: 0.04em;
  line-height: 0.9;
  width: min-content;
  color: var(--cyan);
  text-shadow: var(--glow-cyan);
}

.site-description {
  font-size: 0.65rem;
  color: var(--text-lo);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-top: var(--s1);
}

/* Navigation */
.main-navigation {
  margin-left: auto;
  display: flex;
  align-items: center;
}

.main-navigation ul {
  display: flex;
  list-style: none;
  padding: 0;
  margin: 0;
  gap: var(--s5);
  flex-wrap: nowrap;
  align-items: center;
}

.main-navigation li {
  margin-bottom: 0;
  line-height: 1;
}

/* Zero out the WordPress-generated nav wrapper div */
.main-navigation > div {
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
}

.main-navigation a {
  display: flex;
  align-items: center;
  font-family: var(--f-body);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-mid);
  text-decoration: none;
  line-height: 1;
  padding: 6px 10px;
  border-radius: 6px;
  background: transparent;
  transition: color var(--ease-base), background var(--ease-base);
}

.main-navigation a:hover,
.main-navigation .current-menu-item > a {
  color: var(--cyan);
  background: rgba(0, 191, 255, 0.08);
}

/* ─────────────────────────────────────────────────────────────
   NAV DROPDOWN — TOPICS SUB-MENU
───────────────────────────────────────────────────────────── */

.main-navigation li.menu-item-has-children {
  position: relative;
}

.main-navigation .sub-menu {
  position: absolute;
  top: calc(100% + var(--s3));
  left: 0;
  min-width: 220px;
  background: var(--bg-1);
  border: 1px solid var(--border-soft);
  border-radius: var(--r-md);
  padding: var(--s3) 0;
  display: flex;
  flex-direction: column;
  gap: 0;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-6px);
  transition: opacity var(--ease-base), transform var(--ease-base);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  z-index: 400;
}

.main-navigation li.menu-item-has-children:hover .sub-menu,
.main-navigation li.menu-item-has-children:focus-within .sub-menu {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.main-navigation .sub-menu li { list-style: none; }

.main-navigation .sub-menu a {
  display: block;
  padding: var(--s3) var(--s5);
  min-height: 0;
  font-size: 0.78rem;
}

@media (max-width: 900px) {
  .main-navigation .sub-menu { display: none; }
}