.app-nav {
  position: sticky;
  top: 0;
  z-index: 120;
  background: var(--light);
  color: var(--text-dark);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.app-nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0.5rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  position: relative;
}

.app-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--primary-dark);
}

.app-brand-icon {
  height: 2rem;
  width: auto;
  max-width: 2rem;
  object-fit: contain;
}

.app-brand-name {
  font-size: 1.25rem;
  font-weight: 700;
}

.app-brand-name span {
  color: var(--accent);
}

.app-nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.88);
  color: var(--text-dark);
  cursor: pointer;
}

.app-nav-menu {
  display: flex;
  align-items: center;
}

.app-nav-links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.app-nav-links li {
  position: relative;
}

.app-nav-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  text-decoration: none;
  color: var(--text-dark);
  padding: 0.25rem 0.75rem;
  border-radius: 0.375rem;
  font-size: 0.95rem;
  transition: var(--transition);
}

.app-nav-link:hover {
  background: var(--primary-light);
  color: var(--primary-dark);
}

.app-nav-link-active {
  background: var(--primary-light);
  color: var(--primary-dark);
}

.app-nav-link-icon {
  font-size: 1.15rem;
  line-height: 1;
}

.app-nav-link-text {
  line-height: 1;
  display: none;
}

.nav-pending-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.1rem;
  height: 1.1rem;
  padding: 0 0.25rem;
  background: #ef4444;
  color: #fff;
  font-size: 0.65rem;
  font-weight: 700;
  border-radius: 999px;
  margin-left: 0.25rem;
  line-height: 1;
}

.app-signin-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  text-decoration: none;
  background: var(--primary);
  color: var(--light);
  padding: 0.25rem 0.75rem;
  border-radius: 0.375rem;
  font-size: 0.95rem;
  transition: var(--transition);
}

.app-signin-btn:hover {
  background: var(--primary-dark);
}

.app-logout-btn {
  width: auto;
  height: auto;
  margin-top: 0;
  border: 1px solid transparent;
  background: var(--danger);
  color: #fff;
  border-radius: 0.375rem;
  padding: 0.25rem 0.75rem;
  font-size: 0.95rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  cursor: pointer;
  transition: var(--transition);
}

.app-logout-btn:hover {
  background: var(--danger-dark);
}

.app-logout-btn:disabled,
.app-logout-btn[aria-busy="true"] {
  opacity: 0.7;
  cursor: wait;
}

.app-nav-link:focus-visible,
.app-signin-btn:focus-visible,
.app-logout-btn:focus-visible {
  outline: 2px solid var(--info);
  outline-offset: 2px;
}

@media (min-width: 901px) {
  .app-nav-inner {
    gap: 1.25rem;
  }

  .app-nav-links {
    flex-wrap: nowrap;
    gap: 0.4rem;
  }

  .app-nav-link,
  .app-signin-btn,
  .app-logout-btn {
    min-width: 42px;
    min-height: 42px;
    padding: 0.5rem;
    border-radius: 12px;
  }

  .app-nav-link {
    background: rgba(255, 255, 255, 0.78);
    border: 1px solid transparent;
  }

  .app-nav-link:hover,
  .app-nav-link:focus-visible,
  .app-nav-link-active {
    border-color: rgba(16, 185, 129, 0.18);
  }

  .app-nav-link-text {
    position: absolute;
    top: calc(100% + 0.45rem);
    left: 50%;
    transform: translate(-50%, -6px);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    white-space: nowrap;
    padding: 0.38rem 0.55rem;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.9);
    color: #fff;
    font-size: 0.78rem;
    line-height: 1;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s ease;
    z-index: 5;
    box-shadow: 0 12px 24px -18px rgba(15, 23, 42, 0.55);
  }

  .app-nav-link:hover .app-nav-link-text,
  .app-nav-link:focus-visible .app-nav-link-text,
  .app-signin-btn:hover .app-nav-link-text,
  .app-signin-btn:focus-visible .app-nav-link-text,
  .app-logout-btn:hover .app-nav-link-text,
  .app-logout-btn:focus-visible .app-nav-link-text {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, 0);
  }

  .app-brand-name {
    white-space: nowrap;
  }
}

@media (max-width: 900px) {
  .app-nav-inner {
    gap: 0.85rem;
  }

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

  .app-nav-menu {
    position: absolute;
    top: calc(100% + 0.55rem);
    right: 0;
    display: none;
    width: min(320px, calc(100vw - 1.5rem));
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 20px 40px -28px rgba(15, 23, 42, 0.4);
    z-index: 130;
  }

  .app-nav-menu.app-nav-menu-open {
    display: block;
  }

  .app-nav-links {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0.4rem;
  }

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

  .app-nav-link,
  .app-signin-btn,
  .app-logout-btn {
    width: 100%;
    min-height: 44px;
    justify-content: flex-start;
    padding: 0.7rem 0.8rem;
    border-radius: 12px;
  }

  .app-nav-link {
    background: rgba(255, 255, 255, 0.8);
  }

  .app-nav-link-text {
    display: inline-flex;
  }

  .app-nav-link-active {
    border: 1px solid rgba(16, 185, 129, 0.18);
  }

  .app-brand-name {
    font-size: 1.08rem;
  }

  .app-nav.app-nav-mobile-inline .app-nav-toggle {
    display: none;
  }

  .app-nav.app-nav-mobile-inline .app-nav-menu {
    position: static;
    display: flex;
    width: auto;
    padding: 0;
    border: 0;
    background: transparent;
    box-shadow: none;
  }

  .app-nav.app-nav-mobile-inline .app-nav-links {
    width: auto;
    flex-direction: row;
    align-items: center;
    flex-wrap: nowrap;
    gap: 0.35rem;
  }

  .app-nav.app-nav-mobile-inline .app-nav-links li {
    width: auto;
  }

  .app-nav.app-nav-mobile-inline .app-nav-link,
  .app-nav.app-nav-mobile-inline .app-signin-btn,
  .app-nav.app-nav-mobile-inline .app-logout-btn {
    position: relative;
    width: auto;
    min-width: 40px;
    min-height: 40px;
    justify-content: center;
    padding: 0.45rem;
    border-radius: 10px;
  }

  .app-nav.app-nav-mobile-inline .app-nav-link-text {
    position: absolute;
    top: calc(100% + 0.4rem);
    left: 50%;
    transform: translate(-50%, -6px);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    white-space: nowrap;
    padding: 0.35rem 0.5rem;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.9);
    color: #fff;
    font-size: 0.76rem;
    line-height: 1;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s ease;
    z-index: 5;
    box-shadow: 0 12px 24px -18px rgba(15, 23, 42, 0.55);
  }

  .app-nav.app-nav-mobile-inline .app-nav-link {
    background: rgba(255, 255, 255, 0.78);
    border: 1px solid transparent;
  }

  .app-nav.app-nav-mobile-inline .app-nav-link-active {
    border: 1px solid rgba(16, 185, 129, 0.18);
  }

  .app-nav.app-nav-mobile-inline .app-nav-link:hover .app-nav-link-text,
  .app-nav.app-nav-mobile-inline .app-nav-link:focus-visible .app-nav-link-text,
  .app-nav.app-nav-mobile-inline .app-signin-btn:hover .app-nav-link-text,
  .app-nav.app-nav-mobile-inline .app-signin-btn:focus-visible .app-nav-link-text,
  .app-nav.app-nav-mobile-inline .app-logout-btn:hover .app-nav-link-text,
  .app-nav.app-nav-mobile-inline .app-logout-btn:focus-visible .app-nav-link-text {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, 0);
  }
}