.sr-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: linear-gradient(to bottom, rgba(5, 7, 19, 0.98), rgba(5, 7, 19, 0.92));
  border-bottom: 1px solid rgba(159, 134, 255, 0.35);
  backdrop-filter: blur(14px);
}

.sr-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-3);
}

.sr-header__brand {
  display: flex;
  align-items: center;
  min-width: 0;
}

.sr-header__logo-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text);
}

.sr-header__logo-mark {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at 30% 0, rgba(159, 134, 255, 0.8) 0, rgba(42, 56, 142, 0.98) 40%, #050713 100%);
  box-shadow: var(--shadow-glow-primary);
  color: var(--color-gray-900);
  flex-shrink: 0;
}

.sr-header__logo-mark i {
  font-size: 1.1rem;
}

.sr-header__text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.sr-header__site-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-gray-900);
  white-space: nowrap;
}

.sr-header__site-subtitle {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  white-space: nowrap;
  text-overflow: ellipsis;
  overflow: hidden;
}

.sr-header__nav {
  display: flex;
}

.sr-header__nav-list {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.sr-header__nav-link {
  position: relative;
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-gray-700);
  padding-block: 0.25rem;
}

.sr-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, #6c7bff, #9f86ff);
  transition: width var(--transition-normal);
}

.sr-header__nav-link:hover::after,
.sr-header__nav-link:focus-visible::after,
.sr-header__nav-link[aria-current="page"]::after {
  width: 100%;
}

.sr-header__nav-link[aria-current="page"] {
  color: var(--color-gray-900);
}

.sr-header__nav-item--cta {
  margin-left: var(--space-2);
}

.sr-header__cta {
  font-size: 0.72rem;
}

/* Mobile toggle */
.sr-header__toggle {
  display: none;
  position: relative;
  width: 40px;
  height: 32px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(159, 134, 255, 0.65);
  background: rgba(11, 15, 36, 0.95);
  cursor: pointer;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  gap: 5px;
  padding: 0;
  color: inherit;
}

.sr-header__toggle-bar {
  width: 60%;
  height: 2px;
  border-radius: 999px;
  background: var(--color-gray-800);
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.sr-header__toggle.is-open .sr-header__toggle-bar:nth-child(1) {
  transform: translateY(3.5px) rotate(45deg);
}

.sr-header__toggle.is-open .sr-header__toggle-bar:nth-child(2) {
  opacity: 0;
}

.sr-header__toggle.is-open .sr-header__toggle-bar:nth-child(3) {
  transform: translateY(-3.5px) rotate(-45deg);
}

/* Informational notice strip */
.sr-header__notice {
  border-top: 1px solid rgba(111, 126, 255, 0.3);
  background: radial-gradient(circle at 0 0, rgba(139, 210, 255, 0.16) 0, transparent 55%),
              radial-gradient(circle at 100% 100%, rgba(194, 134, 255, 0.18) 0, transparent 55%),
              rgba(8, 10, 30, 0.96);
}

.sr-header__notice-inner {
  padding-block: 0.45rem;
}

.sr-header__notice p {
  margin: 0;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.sr-header__notice strong {
  color: var(--color-gray-900);
}

/* Responsive */
@media (max-width: 880px) {
  .sr-header__site-subtitle {
    display: none;
  }
}

@media (max-width: 1050px) {
  .sr-header__inner {
    padding-block: var(--space-2);
  }

  .sr-header__toggle {
    display: inline-flex;
  }

  .sr-header__nav {
    position: fixed;
    inset-inline: 0;
    top: 58px;
    background: radial-gradient(circle at 20% 0, rgba(0, 7, 68, 0.98) 0, rgba(5, 7, 19, 0.98) 45%, rgba(0, 0, 0, 0.98) 100%);
    transform: translateY(-110%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
  }

  .sr-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-4) var(--space-4) var(--space-6);
    gap: var(--space-3);
  }

  .sr-header__nav-link {
    font-size: 0.8rem;
  }

  .sr-header__nav--open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .sr-header__nav-item--cta {
    width: 100%;
  }

  .sr-header__cta {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 520px) {
  .sr-header__site-title {
    font-size: 0.85rem;
  }

  .sr-header__logo-mark {
    width: 34px;
    height: 34px;
  }

  .sr-header__notice-inner {
    padding-inline: var(--space-4);
  }

  .sr-header__notice p {
    font-size: 0.7rem;
  }
}