.sb-header {
  position: sticky;
  top: 0;
  z-index: 90;
  min-height: var(--header-h);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background:
    linear-gradient(180deg, rgba(3, 6, 11, 0.82), rgba(3, 6, 11, 0.58)),
    rgba(3, 6, 11, 0.6);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  transition:
    min-height 220ms var(--ease-out),
    background 220ms var(--ease-out),
    border-color 220ms var(--ease-out),
    box-shadow 220ms var(--ease-out);
}

.sb-scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  transform: scaleX(0);
  transform-origin: left;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-violet-2), var(--c-lime));
  box-shadow: 0 0 18px rgba(94, 231, 255, 0.38);
  pointer-events: none;
}

.sb-header.is-scrolled {
  min-height: 64px;
  border-color: rgba(94, 231, 255, 0.16);
  background:
    linear-gradient(180deg, rgba(3, 6, 11, 0.9), rgba(3, 6, 11, 0.72)),
    rgba(3, 6, 11, 0.72);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.22);
}

.sb-header__inner {
  min-height: inherit;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.sb-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  min-width: 0;
}

.sb-brand__mark {
  position: relative;
  width: 46px;
  height: 46px;
  flex: 0 0 46px;
  display: grid;
  place-items: center;
  overflow: hidden;
  border-radius: 16px;
  color: var(--c-text);
  background: rgba(255, 255, 255, 0.035);
  border: 1px solid rgba(255, 255, 255, 0.14);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.12),
    0 0 30px rgba(94, 231, 255, 0.14),
    0 18px 40px rgba(0, 0, 0, 0.28);
}

.sb-brand__logo {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.sb-brand__text {
  min-width: 0;
  display: grid;
  gap: 0.08rem;
}

.sb-brand__text strong {
  color: var(--c-text);
  font-size: 1rem;
  line-height: 1.15;
  white-space: nowrap;
}

.sb-brand__text span {
  max-width: 32ch;
  color: var(--c-muted);
  font-size: 0.82rem;
  line-height: 1.25;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sb-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.sb-nav__link {
  position: relative;
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 0.9rem;
  border-radius: 999px;
  color: var(--c-muted);
  font-weight: 750;
  font-size: 0.92rem;
  transition:
    color 180ms var(--ease-out),
    background 180ms var(--ease-out),
    transform 180ms var(--ease-out);
}

.sb-nav__link::after {
  content: "";
  position: absolute;
  left: 1rem;
  right: 1rem;
  bottom: 0.35rem;
  height: 1px;
  transform: scaleX(0);
  transform-origin: center;
  background: linear-gradient(90deg, transparent, var(--c-cyan), transparent);
  transition: transform 180ms var(--ease-out);
}

.sb-nav__link:hover,
.sb-nav__link.is-active {
  color: var(--c-text);
}

.sb-nav__link:hover::after,
.sb-nav__link.is-active::after {
  transform: scaleX(1);
}

.sb-nav__cta {
  margin-left: 0.45rem;
  color: #020409;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.92), rgba(94, 231, 255, 0.86)),
    var(--c-cyan);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.64),
    0 0 24px rgba(94, 231, 255, 0.18);
}

.sb-nav__cta::after {
  display: none;
}

.sb-menu-button {
  position: relative;
  width: 46px;
  height: 46px;
  display: none;
  place-items: center;
  padding: 0;
  border: 1px solid var(--glass-border);
  border-radius: 15px;
  color: var(--c-text);
  background: var(--glass-bg), rgba(255, 255, 255, 0.035);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
  transition:
    border-color 180ms var(--ease-out),
    box-shadow 180ms var(--ease-out),
    background 180ms var(--ease-out);
}

.sb-menu-button::before {
  content: "";
  position: absolute;
  inset: 8px;
  border-radius: 12px;
  background: radial-gradient(circle at 50% 50%, rgba(94, 231, 255, 0.22), transparent 62%);
  opacity: 0;
  transform: scale(0.72);
  transition:
    opacity 180ms var(--ease-out),
    transform 180ms var(--ease-out);
}

.sb-menu-button__line {
  position: absolute;
  left: 13px;
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
  box-shadow: 0 0 12px rgba(94, 231, 255, 0.22);
  transform-origin: center;
  transition:
    transform 220ms var(--ease-out),
    opacity 160ms var(--ease-out),
    width 220ms var(--ease-out);
}

.sb-menu-button__line:nth-child(1) {
  transform: translateY(-7px);
}

.sb-menu-button__line:nth-child(2) {
  width: 15px;
  transform: translateY(0);
}

.sb-menu-button__line:nth-child(3) {
  transform: translateY(7px);
}

.sb-menu-button:hover,
.sb-menu-button[aria-expanded="true"] {
  border-color: rgba(94, 231, 255, 0.28);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.12),
    0 0 24px rgba(94, 231, 255, 0.14);
}

.sb-menu-button:hover::before,
.sb-menu-button[aria-expanded="true"]::before {
  opacity: 1;
  transform: scale(1);
}

.sb-menu-button[aria-expanded="true"] .sb-menu-button__line:nth-child(1) {
  transform: rotate(45deg);
}

.sb-menu-button[aria-expanded="true"] .sb-menu-button__line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.sb-menu-button[aria-expanded="true"] .sb-menu-button__line:nth-child(3) {
  transform: rotate(-45deg);
}

.sb-footer {
  position: relative;
  padding: clamp(3rem, 7vw, 5rem) 0 2rem;
  border-top: 1px solid var(--c-line);
  background:
    radial-gradient(circle at 20% 0%, rgba(94, 231, 255, 0.1), transparent 26rem),
    rgba(255, 255, 255, 0.018);
}

.sb-footer__grid {
  display: grid;
  gap: 2rem;
}

.sb-footer__brand p {
  max-width: 54ch;
  margin-top: 1.1rem;
}

.sb-footer__group {
  display: grid;
  gap: 0.65rem;
  align-content: start;
}

.sb-footer__group strong {
  color: var(--c-text);
}

.sb-footer__group a,
.sb-footer__group span {
  color: var(--c-muted);
}

.sb-footer__group a:hover {
  color: var(--c-cyan-2);
}

.sb-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--c-line);
  color: var(--c-muted-2);
  font-size: 0.9rem;
}

@media (min-width: 860px) {
  .sb-footer__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(180px, 0.55fr) minmax(220px, 0.75fr);
  }
}