/* Navigation — mobile top bar + dropdown; desktop left sidebar */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 12, 18, 0.94);
  backdrop-filter: blur(14px) saturate(1.15);
  -webkit-backdrop-filter: blur(14px) saturate(1.15);
  border-bottom: 1px solid var(--border-strong);
}

.site-nav .nav-inner {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 56px;
  gap: 0.75rem;
  position: relative;
}

.site-nav .logo {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
  text-decoration: none;
  flex-shrink: 1;
  min-width: 0;
  z-index: 2;
}

.site-nav .logo-text {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

.site-nav .logo img {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
}

.site-nav .nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
  z-index: 2;
}

.site-nav .nav-links {
  display: none;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav .nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.18s, background-color 0.18s;
}

.site-nav .nav-links a:hover,
.site-nav .nav-links a.active {
  color: var(--accent-hover);
}

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.18s, background-color 0.18s;
}

.nav-toggle:hover {
  border-color: var(--border-hover);
  background: var(--surface-2);
}

.nav-toggle span {
  display: block;
  width: 16px;
  height: 1.5px;
  background: currentColor;
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

@media (max-width: 899px) {
  body.nav-open {
    overflow: hidden;
  }

  .site-nav .nav-inner {
    padding-left: var(--page-gutter-l, 1rem);
    padding-right: var(--page-gutter-r, 1rem);
    flex-wrap: wrap;
  }

  .site-nav.is-open {
    background: rgba(10, 12, 18, 0.98);
  }

  .site-nav.is-open .nav-links {
    display: flex;
    flex-direction: column;
    width: 100%;
    order: 3;
    gap: 0.15rem;
    padding: 0.35rem 0 0.85rem;
    border-top: 1px solid var(--border);
    margin-top: 0.15rem;
  }

  .site-nav.is-open .nav-links a {
    display: block;
    padding: 0.7rem 0.85rem;
    border-radius: var(--radius-sm);
  }

  .site-nav.is-open .nav-links a:hover,
  .site-nav.is-open .nav-links a.active {
    background: var(--accent-soft);
    color: var(--accent-hover);
  }

  .site-nav .cmd-trigger {
    display: none;
  }
}

.lang-switcher {
  position: relative;
  flex-shrink: 0;
}

.lang-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  letter-spacing: 0.04em;
  transition: border-color 0.2s, color 0.2s;
  min-height: 36px;
}

.lang-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.lang-menu {
  display: none;
  position: absolute;
  right: 0;
  top: calc(100% + 6px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  list-style: none;
  padding: 0.35rem 0;
  min-width: 75px;
  z-index: 200;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.lang-menu.open {
  display: block;
}

.lang-menu li button {
  display: block;
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.4rem 0.85rem;
  cursor: pointer;
  letter-spacing: 0.04em;
  transition: color 0.15s, background-color 0.15s;
}

.lang-menu li button:hover {
  color: var(--text);
  background-color: var(--bg);
}

.lang-menu li button.selected {
  color: var(--accent);
}

@media (min-width: 900px) {
  .site-nav {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 216px;
    height: 100vh;
    border-right: 1px solid var(--border-strong);
    border-bottom: none;
    background: rgba(7, 9, 14, 0.82);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    overflow-y: auto;
    max-width: none;
    margin: 0;
    padding: 0;
  }

  .site-nav .nav-inner {
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    height: 100%;
    min-height: 100vh;
    padding: 1.75rem 1.15rem 1.5rem;
    max-width: none;
    margin: 0;
    gap: 0;
  }

  .site-nav .logo {
    font-size: 1.05rem;
    gap: 0.6rem;
    margin-bottom: 2.25rem;
    flex-shrink: 0;
  }

  .site-nav .logo-text {
    overflow: visible;
    text-overflow: clip;
    white-space: normal;
  }

  .site-nav .logo img {
    width: 32px;
    height: 32px;
  }

  .site-nav .nav-links {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    width: 100%;
    flex: 1;
  }

  .site-nav .nav-links li {
    width: 100%;
  }

  .site-nav .nav-links a {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 0.55rem 0.85rem;
    border-radius: var(--radius-sm);
  }

  .site-nav .nav-links a:hover {
    background-color: var(--surface-2);
    color: var(--text);
  }

  .site-nav .nav-links a.active,
  .site-nav .nav-links a[aria-current="location"] {
    background: var(--accent-soft);
    color: var(--accent-hover);
    font-weight: 600;
    box-shadow: inset 2px 0 var(--accent);
  }

  .site-nav .nav-actions {
    width: 100%;
    margin-top: auto;
    padding-top: 1.25rem;
    flex-direction: column;
    align-items: stretch;
    gap: 0.65rem;
  }

  .nav-toggle {
    display: none;
  }

  .lang-switcher {
    width: 100%;
  }

  .lang-btn {
    width: 100%;
    text-align: left;
    padding: 0.45rem 0.85rem;
    font-size: 0.82rem;
  }

  .lang-menu {
    right: auto;
    left: 0;
    top: auto;
    bottom: calc(100% + 6px);
    min-width: 100%;
    box-shadow: 0 -8px 24px rgba(0, 0, 0, 0.4);
  }

  .site-nav .cmd-trigger {
    width: 100%;
    justify-content: space-between;
  }

  .site-nav::-webkit-scrollbar {
    width: 3px;
  }

  .site-nav::-webkit-scrollbar-track {
    background: transparent;
  }

  .site-nav::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 2px;
  }

  .site-nav::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
  }
}