:root {
  --nav-height: 56px;
  --nav-safe-top: env(safe-area-inset-top);
  --nav-padding-x: 16px;
  --nav-gap: 10px;
  --nav-logo-size: 28px;
  --nav-letter-spacing: 0.06em;
  --nav-z: 20;
  --nav-bg: linear-gradient(
    to bottom,
    rgba(15, 23, 42, 0.98),
    rgba(15, 23, 42, 0.8)
  );
  --nav-border: rgba(148, 163, 184, 0.3);
  --nav-link-hover: rgba(148, 163, 184, 0.12);
  --nav-primary-bg: rgba(37, 99, 235, 0.25);
  --nav-primary-border: rgba(37, 99, 235, 0.35);
  --nav-gear-bg: rgba(2, 6, 23, 0.96);
  --nav-gear-border: rgba(148, 163, 184, 0.22);
  --nav-gear-shadow: 0 16px 60px rgba(0, 0, 0, 0.55);
  --nav-text: var(--text, #e5e7eb);
}

.top-nav {
  position: var(--nav-position, sticky);
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  padding: 0 var(--nav-padding-x);
  padding-top: var(--nav-safe-top);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: var(--nav-bg);
  z-index: var(--nav-z);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--nav-border);
}

.nav-left,
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 14px;
  letter-spacing: var(--nav-letter-spacing);
  text-transform: uppercase;
  color: var(--nav-text);
  text-decoration: none;
  font-family: var(--seen-font, inherit);
  line-height: 1;
}

.nav-left img,
.brand img {
  width: var(--nav-logo-size);
  height: var(--nav-logo-size);
  border-radius: 999px;
  object-fit: cover;
}

.brand a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: inherit;
  text-decoration: none;
}

.seen-nav-brand-label {
  display: inline-flex;
  align-items: center;
  gap: 1px;
}

.seen-nav-brand-word {
  display: inline-block;
}

.seen-nav-brand-plus {
  display: inline-block;
  margin-left: 1px;
  font-weight: 800;
  color: #8dd4ff;
  text-shadow: 0 0 10px rgba(141, 212, 255, 0.35);
  animation: seenNavPlusShimmer 2.2s linear infinite;
}

@supports ((-webkit-background-clip: text) or (background-clip: text)) {
  .seen-nav-brand-plus {
    background-image: linear-gradient(
      110deg,
      #70c5ff 20%,
      #ffffff 50%,
      #70c5ff 80%
    );
    background-size: 220% 100%;
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    -webkit-text-fill-color: transparent;
  }
}

@keyframes seenNavPlusShimmer {
  0% {
    background-position: 170% 0;
  }
  100% {
    background-position: -40% 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .seen-nav-brand-plus {
    animation: none;
  }
}

.nav-links,
.nav {
  display: flex;
  align-items: center;
  gap: var(--nav-gap);
  font-size: 13px;
  font-family: var(--seen-font, inherit);
}

.nav-link,
.nav a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 999px;
  background: transparent;
  border: 1px solid transparent;
  color: var(--nav-text);
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, opacity 0.25s ease,
    transform 0.25s ease;
}

.nav-link:hover,
.nav a:hover {
  background: var(--nav-link-hover);
  border-color: var(--nav-link-hover);
}

.nav-link.nav-primary {
  background: var(--nav-primary-bg);
  border-color: var(--nav-primary-border);
  color: var(--nav-text);
}

.nav-link.nav-primary:hover {
  background: var(--nav-primary-bg);
  border-color: var(--nav-primary-border);
}

.nav a.active {
  background: var(--nav-primary-bg);
  border-color: var(--nav-primary-border);
}

.nav-admin {
  display: none;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.nav-admin.is-visible {
  display: inline-flex;
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

/* Bottom nav unread state (glow) */
.bottom-nav .bn-link.has-unread {
  border-color: rgba(34, 197, 94, 0.75);
  background: rgba(34, 197, 94, 0.14);
  color: #eafff2;
  box-shadow:
    0 0 0 2px rgba(34, 197, 94, 0.18),
    0 8px 18px rgba(34, 197, 94, 0.35);
  animation: unreadPulse 1.6s ease-in-out infinite;
}

@media (prefers-reduced-motion: reduce) {
  .bottom-nav .bn-link.has-unread {
    animation: none;
  }
}

@keyframes unreadPulse {
  0% {
    box-shadow:
      0 0 0 2px rgba(34, 197, 94, 0.16),
      0 8px 18px rgba(34, 197, 94, 0.25);
  }
  50% {
    box-shadow:
      0 0 0 3px rgba(34, 197, 94, 0.26),
      0 10px 22px rgba(34, 197, 94, 0.45);
  }
  100% {
    box-shadow:
      0 0 0 2px rgba(34, 197, 94, 0.16),
      0 8px 18px rgba(34, 197, 94, 0.25);
  }
}

/* Gear (settings) menu */
.nav-gear {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.nav-gear-btn {
  width: 34px;
  height: 34px;
  border-radius: 999px;
  background: transparent;
  border: 0;
  color: rgba(229, 231, 235, 0.95);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s ease;
  touch-action: manipulation;
}

.nav-gear-btn:hover {
  background: rgba(148, 163, 184, 0.2);
}

.nav-gear-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 220px;
  border-radius: 14px;
  border: 1px solid var(--nav-gear-border);
  background: var(--nav-gear-bg);
  box-shadow: var(--nav-gear-shadow);
  backdrop-filter: blur(10px);
  z-index: 100;
  padding: 8px;
  display: none;
}

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

.nav-gear:focus-within .nav-gear-menu {
  display: block;
}

@media (max-width: 720px) {
  .nav-gear-menu {
    position: fixed;
    top: calc(var(--nav-height) + env(safe-area-inset-top) + 8px);
    right: 12px;
    left: auto;
    z-index: 9999;
  }
}

.nav-gear-item {
  width: 100%;
  text-align: left;
  padding: 10px 10px;
  border-radius: 10px;
  border: 0;
  background: transparent;
  color: rgba(229, 231, 235, 0.95);
  cursor: pointer;
  font-weight: 750;
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-gear-item:hover {
  background: rgba(148, 163, 184, 0.16);
}

.nav-gear-item.danger {
  color: rgba(248, 113, 113, 0.95);
}

.nav-gear-item.admin-only {
  display: none;
}

.nav-gear-status {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.04em;
  padding-left: 10px;
  color: rgba(148, 163, 184, 0.9);
}

.nav-gear-status.is-on {
  color: #22c55e;
}

.nav-gear-meta {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 2px 6px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.35);
  background: rgba(148, 163, 184, 0.12);
  color: rgba(203, 213, 225, 0.9);
}

.nav-gear-sep {
  height: 1px;
  margin: 6px 6px;
  background: rgba(148, 163, 184, 0.18);
}

@media (max-width: 720px) {
  .nav-gear-btn {
    width: 32px;
    height: 32px;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .nav-links > :not(.nav-admin),
  .nav > :not(.nav-admin) {
    animation: navFade 0.25s ease both;
  }
}

@media (prefers-reduced-motion: reduce) {
  .nav-links > :not(.nav-admin),
  .nav > :not(.nav-admin) {
    animation: none;
  }
}

@keyframes navFade {
  from {
    opacity: 0;
    transform: translateY(-2px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 720px) {
  body:not(.is-admin) .top-nav {
    height: auto;
    padding: 8px 12px;
    gap: 8px;
    flex-wrap: nowrap;
  }

  body:not(.is-admin) .nav-left {
    flex: 0 0 auto;
  }

  body:not(.is-admin) .nav-links {
    flex: 1 1 auto;
    min-width: 0;
    margin-left: auto;
    justify-content: flex-end;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    gap: 6px;
    padding-bottom: 0;
  }

  body:not(.is-admin) .nav-links::-webkit-scrollbar {
    display: none;
  }

  body:not(.is-admin) .nav-link {
    flex: 0 0 auto;
    padding: 8px 8px;
    font-size: 13px;
    white-space: nowrap;
  }

  .top-nav > .nav-gear {
    flex: 0 0 auto;
    margin-left: 6px;
  }
}