:root {
  --nav-accent: #38bdf8;
  --nav-text: #e5e7eb;
  --nav-muted: #9ca3af;
  --nav-bg-1: rgba(8, 14, 30, 0.97);
  --nav-bg-2: rgba(11, 18, 37, 0.94);
}

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  background: linear-gradient(180deg, var(--nav-bg-1), var(--nav-bg-2));
  border-bottom: 1px solid rgba(148, 163, 184, 0.28);
}

.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0.62rem 1.1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  position: relative;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.nav-logo {
  width: 60px;
  height: 60px;
  border-radius: 999px;
  padding: 1px;
}

.nav-title {
  font-weight: 650;
  font-size: 1.02rem;
  letter-spacing: 0.01em;
}

.nav-subtitle {
  font-size: 0.72rem;
  color: var(--nav-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

#nav-toggle {
  display: none;
}

.nav-toggle-label {
  display: none;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
  padding: 0.4rem;
}

.nav-toggle-bar {
  width: 22px;
  height: 2px;
  background: var(--nav-muted);
  border-radius: 2px;
  transition: 0.2s ease;
}

.nav-links-wrapper {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.nav-link,
.nav-summary {
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  font-size: 0.91rem;
  border: 1px solid transparent;
  color: #b3c0d0;
  display: inline-flex;
  align-items: center;
  backdrop-filter: blur(4px);
  transition: color 180ms ease, background-color 180ms ease, border-color 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}

.nav-link:hover,
.nav-link:focus-visible,
.nav-summary:hover,
.nav-summary:focus-visible,
.nav-dropdown[open] > .nav-summary {
  color: var(--nav-text);
  background: rgba(56, 189, 248, 0.12);
  border-color: rgba(56, 189, 248, 0.28);
  box-shadow: 0 8px 16px rgba(2, 6, 23, 0.35);
  transform: translateY(-1px);
  outline: none;
}

.nav-dropdown {
  position: relative;
}

.nav-summary {
  list-style: none;
  cursor: pointer;
  gap: 0.3rem;
}

.nav-summary::-webkit-details-marker {
  display: none;
}

.nav-summary::after {
  content: "▾";
  font-size: 0.7rem;
  opacity: 0.8;
  transition: transform 180ms ease;
}

.nav-dropdown[open] > .nav-summary::after {
  transform: rotate(180deg);
}

.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 0.45rem);
  left: 0;
  min-width: 210px;
  background: linear-gradient(180deg, rgba(7, 12, 26, 0.98), rgba(10, 16, 32, 0.98));
  border: 1px solid rgba(148, 163, 184, 0.26);
  border-radius: 10px;
  padding: 0.35rem;
  box-shadow: 0 10px 22px rgba(0, 0, 0, 0.32);
  opacity: 0;
  transform: translateY(8px) scale(0.98);
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms ease;
  z-index: 30;
}

.nav-dropdown[open] .nav-dropdown-menu,
.nav-dropdown:hover .nav-dropdown-menu {
  display: grid;
  gap: 0.2rem;
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.nav-dropdown-link {
  display: block;
  padding: 0.5rem 0.62rem;
  border-radius: 8px;
  font-size: 0.88rem;
  color: #aab7c7;
  border: 1px solid transparent;
  transition: color 160ms ease, background-color 160ms ease, border-color 160ms ease, padding-left 160ms ease;
}

.nav-dropdown-link:hover,
.nav-dropdown-link:focus-visible {
  color: var(--nav-text);
  background: rgba(56, 189, 248, 0.12);
  border-color: rgba(56, 189, 248, 0.28);
  padding-left: 0.78rem;
  outline: none;
}

@media (max-width: 720px) {
  .nav-toggle-label {
    display: flex;
  }

  .nav-links-wrapper {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgb(15, 23, 42);
    border-top: 1px solid rgba(148, 163, 184, 0.22);
    flex-direction: column;
    padding: 0.6rem 1rem;
    display: none;
    animation: navFadeIn 220ms ease;
  }

  #nav-toggle:checked ~ .nav-links-wrapper {
    display: flex;
  }

  .nav-links {
    flex-direction: column;
    gap: 0.5rem;
    display: flex;
    width: 100%;
  }

  .nav-dropdown {
    width: 100%;
  }

  .nav-link,
  .nav-summary {
    width: 100%;
    justify-content: space-between;
    border-radius: 10px;
    padding: 0.55rem 0.75rem;
  }

  .nav-dropdown-menu {
    position: static;
    min-width: 0;
    width: 100%;
    box-shadow: none;
    margin: 0.2rem 0 0.45rem;
    padding: 0.28rem;
    opacity: 1;
    transform: none;
    pointer-events: auto;
    display: none;
  }

  .nav-dropdown[open] .nav-dropdown-menu {
    display: grid;
    animation: navFadeIn 200ms ease;
  }

  .nav-dropdown-link {
    padding: 0.56rem 0.65rem;
    border-radius: 8px;
  }
}

@keyframes navFadeIn {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .nav-link,
  .nav-summary,
  .nav-dropdown-menu,
  .nav-dropdown-link,
  .nav-summary::after,
  .nav-links-wrapper {
    transition: none;
    animation: none;
  }
}