.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: linear-gradient(145deg, rgba(5, 20, 34, 0.94), rgba(4, 14, 25, 0.92));
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(128, 214, 237, 0.22);
}

.site-header::before {
  content: '';
  position: absolute;
  inset: auto 0 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(127, 211, 236, 0.72), transparent);
  pointer-events: none;
}

.site-header::after {
  content: '';
  position: absolute;
  left: 0;
  right: auto;
  bottom: 0;
  height: 2px;
  width: calc(var(--scroll-progress, 0) * 100%);
  background: linear-gradient(90deg, rgba(31, 192, 232, 0.88), rgba(109, 224, 255, 0.88));
  box-shadow: 0 0 14px rgba(78, 209, 244, 0.42);
  pointer-events: none;
  transition: width 0.1s linear;
}

.header-inner {
  max-width: 1460px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(145deg, #071a2b, #143956);
  border: 1px solid rgba(127, 211, 236, 0.46);
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 1.26rem;
  color: #c9effd;
  box-shadow: inset 0 0 0 1px rgba(127, 211, 236, 0.2);
}

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

.brand-title {
  font-size: 1.24rem;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink-100);
}

.brand-subtitle {
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: rgba(171, 201, 216, 0.8);
  font-weight: 700;
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px;
  border-radius: 999px;
  border: 1px solid rgba(125, 209, 235, 0.22);
  background: rgba(7, 27, 43, 0.56);
}

.nav-item {
  position: relative;
}

.nav-item::after {
  content: '';
  position: absolute;
  left: -8px;
  right: -8px;
  top: calc(100% - 2px);
  height: 20px;
  pointer-events: none;
}

.nav-item.is-open::after {
  pointer-events: auto;
}

.nav-trigger {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 14px;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--ink-200);
  border: 1px solid rgba(125, 209, 235, 0.18);
  background: rgba(8, 30, 47, 0.36);
  transition: border 0.2s var(--ease), color 0.2s var(--ease), background 0.2s var(--ease);
}

.nav-trigger:hover,
.nav-trigger[aria-expanded='true'] {
  border-color: rgba(128, 214, 237, 0.52);
  color: var(--ink-100);
  background: rgba(14, 58, 84, 0.62);
}

.nav-link {
  padding: 9px 13px;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--ink-200);
  border: 1px solid rgba(125, 209, 235, 0.14);
  transition: color 0.2s var(--ease), background 0.2s var(--ease), border 0.2s var(--ease);
}

.nav-link:hover,
.nav-link[aria-current='page'] {
  color: var(--ink-100);
  border-color: rgba(128, 214, 237, 0.48);
  background: rgba(14, 58, 84, 0.56);
}

.mega-panel {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 420px;
  max-width: min(72vw, 560px);
  background: linear-gradient(160deg, rgba(7, 28, 44, 0.98), rgba(5, 18, 30, 0.98));
  border: 1px solid rgba(128, 214, 237, 0.26);
  border-radius: 20px;
  box-shadow: 0 34px 56px rgba(2, 9, 18, 0.5);
  padding: 18px;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(4px) scale(0.985);
  transition: opacity 0.18s var(--ease), transform 0.18s var(--ease), visibility 0.18s;
}

.nav-item.is-open .mega-panel {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

.mega-title {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: rgba(166, 196, 210, 0.78);
  margin-bottom: 8px;
  font-weight: 700;
}

.mega-link {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 11px 12px;
  border-radius: 12px;
  border: 1px solid rgba(128, 214, 237, 0.2);
  background: rgba(10, 40, 60, 0.44);
  color: rgba(218, 241, 250, 0.95);
  font-size: 0.82rem;
  transition: transform 0.2s var(--ease), border 0.2s var(--ease), background 0.2s var(--ease);
}

.mega-link span {
  font-size: 0.74rem;
  color: rgba(171, 200, 214, 0.84);
}

.mega-link:hover {
  transform: translateY(-2px);
  border-color: rgba(128, 214, 237, 0.54);
  background: rgba(18, 61, 88, 0.62);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid rgba(127, 211, 236, 0.28);
  background: rgba(10, 37, 58, 0.58);
}

.nav-panel {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-mobile {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(4, 10, 18, 0.88);
  backdrop-filter: blur(10px);
  z-index: 1200;
}

.nav-mobile-panel {
  position: absolute;
  top: calc(var(--header-height) + 12px);
  left: 16px;
  right: 16px;
  background: linear-gradient(160deg, rgba(8, 29, 44, 0.98), rgba(5, 18, 30, 0.98));
  border-radius: var(--radius-lg);
  padding: 20px;
  display: grid;
  gap: 16px;
  border: 1px solid rgba(127, 211, 236, 0.26);
}

.nav-mobile-panel a {
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid rgba(127, 211, 236, 0.2);
  background: rgba(10, 40, 61, 0.52);
}

.nav-mobile-panel .nav-mobile-cta {
  background: linear-gradient(135deg, var(--accent-600), var(--accent-500));
  color: #021018;
  border: none;
}

@media (max-width: 1200px) {
  .primary-nav {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav-panel {
    gap: 8px;
  }

  .header-actions .button-secondary {
    display: none;
  }
}

@media (max-width: 720px) {
  .header-inner {
    padding: 10px 12px;
    gap: 12px;
  }

  .brand-title {
    font-size: 0.78rem;
  }

  .brand-subtitle {
    font-size: 0.5rem;
    letter-spacing: 0.12em;
  }

  .brand-mark {
    width: 38px;
    height: 38px;
  }
}