:root {
  --nav-bg: rgba(18, 27, 47, 0.72);
  --nav-border: rgba(255, 255, 255, 0.1);
  --nav-text: #e8eeff;
  --nav-muted: #9aa7c2;
  --nav-accent: #6ee7ff;
}

.top-nav {
  position: sticky;
  top: 0;
  z-index: 999;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: linear-gradient(
    180deg,
    rgba(18, 27, 47, 0.86),
    rgba(18, 27, 47, 0.7)
  );
  border-bottom: 1px solid var(--nav-border);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18);
  transition: all .2s ease;
}

.top-nav.scrolled {
  background: linear-gradient(
    180deg,
    rgba(10, 18, 32, 0.96),
    rgba(10, 18, 32, 0.84)
  );
  box-shadow: 0 12px 26px rgba(0, 0, 0, 0.28);
}

.top-nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 12px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.top-nav-brand {
  color: var(--nav-text);
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0.2px;
  font-size: 16px;
}

.top-nav-links {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.top-nav-link {
  color: var(--nav-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 700;
  padding: 9px 12px;
  border-radius: 12px;
  border: 1px solid transparent;
  transition: all 0.18s ease;
}

.top-nav-link:hover,
.top-nav-link.active {
  color: var(--nav-text);
  border-color: rgba(110, 231, 255, 0.28);
  background: linear-gradient(
    180deg,
    rgba(110, 231, 255, 0.14),
    rgba(110, 231, 255, 0.06)
  );
}

.top-nav-toggle {
  display: none;
  width: 46px;
  height: 46px;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(255,255,255,.04);
  cursor: pointer;
  padding: 0;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}

.top-nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: #e8eeff;
  border-radius: 999px;
  transition: all .2s ease;
}

.top-nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.top-nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.top-nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.floating-share {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 999;
}

.floating-share-btn {
  width: 56px;
  height: 56px;
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 50%;
  background: linear-gradient(
    180deg,
    rgba(110,231,255,.22),
    rgba(110,231,255,.10)
  );
  color: #e8eeff;
  font-size: 22px;
  font-weight: 800;
  cursor: pointer;
  box-shadow:
    0 14px 30px rgba(0,0,0,.28),
    inset 0 1px 0 rgba(255,255,255,.12);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.floating-share-btn:hover {
  transform: translateY(-2px) scale(1.03);
  border-color: rgba(110,231,255,.42);
  box-shadow:
    0 18px 34px rgba(0,0,0,.34),
    0 0 0 1px rgba(110,231,255,.08),
    inset 0 1px 0 rgba(255,255,255,.16);
}

.floating-share-menu {
  position: absolute;
  right: 0;
  bottom: 68px;
  min-width: 210px;
  display: none;
  flex-direction: column;
  gap: 8px;
  padding: 10px;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,.10);
  background: linear-gradient(
    180deg,
    rgba(18,27,47,.92),
    rgba(18,27,47,.82)
  );
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 16px 36px rgba(0,0,0,.34);
}

.floating-share.open .floating-share-menu {
  display: flex;
}

.share-menu-btn {
  width: 100%;
  text-align: left;
  border: 1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.04);
  color: #e8eeff;
  padding: 10px 12px;
  border-radius: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: all .18s ease;
}

.share-menu-btn:hover {
  border-color: rgba(110,231,255,.32);
  background: rgba(110,231,255,.08);
}

@media (max-width: 768px) {
  .top-nav-inner {
    padding: 10px 14px;
  }

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

  .top-nav-links {
    width: 100%;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    padding-top: 8px;
  }

  .top-nav-links.open {
    display: flex;
  }

  .top-nav-link {
    width: 100%;
  }
}