/* Navbar — mobile-first, logo edge-left, hover dropdowns */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 2000;
  height: var(--nav-h);
  background: transparent;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: rgba(5, 10, 18, 0.55);
  backdrop-filter: blur(16px) saturate(1.2);
  -webkit-backdrop-filter: blur(16px) saturate(1.2);
  transition: background 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.site-header.is-scrolled::before {
  background: rgba(5, 10, 18, 0.85);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.nav-bar {
  height: var(--nav-h);
  width: 100%;
  max-width: none;
  margin: 0;
  padding-inline: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  position: relative;
}

@media (min-width: 768px) {
  .nav-bar {
    padding-inline: 1rem;
  }
}

@media (min-width: 1100px) {
  .nav-bar {
    padding-inline: 1.25rem;
    gap: 1.5rem;
  }
}

.nav-logo {
  position: relative;
  z-index: 2;
  flex-shrink: 0;
  display: flex;
  align-items: center;
}

.nav-logo img {
  height: 28px;
  width: auto;
  transition: transform 0.25s var(--ease);
}

@media (min-width: 768px) {
  .nav-logo img {
    height: 34px;
  }
}

.nav-logo:hover img {
  transform: scale(1.03);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  position: relative;
  z-index: 2;
  flex-shrink: 0;
  margin-left: auto;
}

.nav-burger {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.05);
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
}

.nav-burger span {
  width: 17px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform 0.25s var(--ease), opacity 0.2s ease;
}

.nav-burger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-burger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav-burger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile drawer */
.nav-drawer {
  position: fixed;
  top: var(--nav-h);
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1999;
  background: rgba(5, 10, 18, 0.97);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  padding: 0.85rem 0.85rem 2rem;
  overflow-y: auto;
  overscroll-behavior: contain;
  transform: translateY(-0.4rem);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.28s var(--ease), transform 0.28s var(--ease), visibility 0.28s;
}

.nav-drawer.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: none;
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  width: 100%;
}

.nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  width: 100%;
  padding: 0.9rem 0.95rem;
  border-radius: 12px;
  color: rgba(232, 241, 248, 0.92);
  font-weight: 600;
  font-size: 1.02rem;
  font-family: inherit;
  text-align: left;
  border: 1px solid transparent;
  background: transparent;
  cursor: pointer;
  appearance: none;
  text-decoration: none;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.nav-link:hover,
.nav-link.is-active {
  background: rgba(62, 198, 255, 0.08);
  border-color: rgba(62, 198, 255, 0.18);
  color: #fff;
}

.nav-link .chev {
  font-size: 0.78rem;
  opacity: 0.75;
  transition: transform 0.25s var(--ease);
}

.nav-item.is-open > .nav-link .chev,
.nav-item:hover > .nav-link .chev {
  transform: rotate(180deg);
}

.nav-cta-link {
  margin-top: 0.5rem;
  justify-content: center;
  background: linear-gradient(135deg, var(--blue-deep), var(--blue));
  border: 0 !important;
}

.nav-sub {
  display: none;
  padding: 0.2rem 0.4rem 0.65rem 0.7rem;
}

.nav-item.is-open .nav-sub {
  display: block;
}

.nav-sub-label {
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cyan);
  font-weight: 700;
  margin: 0.55rem 0 0.3rem;
}

.nav-sub-label.is-group {
  margin-top: 0.85rem;
  padding-top: 0.7rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-sub-label.is-sub {
  margin-top: 0.45rem;
  margin-bottom: 0.15rem;
  padding-top: 0;
  color: rgba(232, 241, 248, 0.52);
  letter-spacing: 0.08em;
  font-size: 0.62rem;
}

.nav-sub-label.is-group + .nav-sub-label.is-sub {
  margin-top: 0.28rem;
}

.nav-sub-label.is-sub.is-split {
  margin-top: 0.7rem;
  padding-top: 0.55rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.nav-sub a {
  display: flex;
  flex-direction: column;
  gap: 0.12rem;
  padding: 0.65rem 0.8rem;
  border-radius: 10px;
  color: var(--text-dim);
  margin-bottom: 0.15rem;
}

.nav-sub a strong {
  color: var(--text);
  font-weight: 650;
  font-size: 0.95rem;
}

.nav-sub a small {
  color: var(--text-mute);
  font-size: 0.78rem;
}

.nav-sub a:hover {
  background: rgba(255, 255, 255, 0.05);
}

.nav-cta-desktop {
  display: none;
}

/* Desktop */
@media (min-width: 1100px) {
  .nav-burger {
    display: none;
  }

  .nav-drawer {
    position: static;
    inset: auto;
    height: auto;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    background: transparent;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    padding: 0;
    overflow: visible;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
    z-index: 1;
  }

  .nav-list {
    flex-direction: row;
    align-items: center;
    justify-content: flex-end;
    gap: 0.1rem;
    width: auto;
  }

  .nav-link {
    width: auto;
    padding: 0.5rem 0.8rem;
    font-size: 0.9rem;
    border-radius: 8px;
    position: relative;
    white-space: nowrap;
  }

  .nav-link:hover,
  .nav-link.is-active {
    background: rgba(255, 255, 255, 0.06);
    border-color: transparent;
  }

  .nav-link::after {
    content: "";
    position: absolute;
    left: 0.8rem;
    right: 0.8rem;
    bottom: 0.18rem;
    height: 2px;
    border-radius: 2px;
    background: var(--cyan);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.25s var(--ease);
  }

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

  .nav-cta-link {
    display: none;
  }

  .nav-cta-desktop {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1.05rem;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.22);
    background: rgba(255, 255, 255, 0.08);
    font-weight: 650;
    font-size: 0.88rem;
    white-space: nowrap;
    transition: background 0.2s ease, transform 0.2s ease;
  }

  .nav-cta-desktop:hover {
    background: rgba(255, 255, 255, 0.16);
    transform: translateY(-1px);
  }

  .nav-item {
    position: relative;
  }

  /* Hover bridge so dropdown stays open while moving cursor */
  .nav-item.has-sub::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    height: 14px;
  }

  .nav-sub {
    display: block;
    position: absolute;
    top: calc(100% + 10px);
    left: 50%;
    transform: translateX(-50%) translateY(6px);
    min-width: 300px;
    max-height: min(72vh, 560px);
    overflow-y: auto;
    padding: 0.75rem;
    border-radius: 14px;
    background: rgba(8, 16, 28, 0.97);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.2s var(--ease), transform 0.2s var(--ease), visibility 0.2s;
    z-index: 60;
  }

  .nav-item.has-sub:hover .nav-sub,
  .nav-item.has-sub:focus-within .nav-sub {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateX(-50%) translateY(0);
  }

  /* Don't force open class on desktop */
  .nav-item.has-sub .nav-sub {
    display: block;
  }
}