/* nav.css — shared navigation + page transitions */

/* ── Cross-document View Transitions (Chrome 126+, Safari 18+) ── */
@view-transition { navigation: auto; }

::view-transition-old(root) { animation: 150ms ease-out both fade-out; }
::view-transition-new(root) { animation: 200ms ease-out 80ms both fade-in; }
@keyframes fade-out { to { opacity: 0; } }
@keyframes fade-in { from { opacity: 0; } }

.site-nav { view-transition-name: site-nav; }
::view-transition-old(site-nav),
::view-transition-new(site-nav) { animation: none; }

/* ── Fallback page-enter animation ── */
body { animation: page-enter .22s ease-out; }
@keyframes page-enter { from { opacity: 0; } }
body.page-exit { opacity: 0; transition: opacity .12s; }

/* ── Nav bar ── */
.site-nav {
  position: fixed; top: 12px; left: 50%; transform: translateX(-50%);
  z-index: 9000;
  display: flex; align-items: center; gap: 2px;
  padding: 4px;
  border-radius: 50px;
  background: var(--surface-hover);
  backdrop-filter: blur(16px) saturate(1.3);
  -webkit-backdrop-filter: blur(16px) saturate(1.3);
  border: 1px solid var(--border);
  box-shadow: 0 2px 16px rgba(var(--blue-rgb), 0.1);
  font-family: 'Noto Sans SC', 'PingFang SC', sans-serif;
  transition: transform .3s ease, opacity .3s ease;
  max-width: calc(100vw - 24px);
}

.site-nav.hidden {
  transform: translateX(-50%) translateY(-120%);
  opacity: 0;
  pointer-events: none;
}

.nav-slider {
  position: absolute;
  height: calc(100% - 8px); top: 4px;
  border-radius: 50px;
  background: linear-gradient(135deg, var(--blue2), var(--blue));
  box-shadow: 0 2px 8px rgba(var(--blue-rgb), 0.2);
  transition: left .3s cubic-bezier(0.34, 1.56, 0.64, 1), width .3s cubic-bezier(0.34, 1.56, 0.64, 1);
  pointer-events: none;
  z-index: 0;
}

.site-nav a {
  display: flex; align-items: center; gap: 4px;
  padding: 5px 14px;
  border-radius: 50px;
  font-size: 12px; font-weight: 500;
  color: var(--text2);
  text-decoration: none;
  transition: color .18s;
  white-space: nowrap;
  position: relative; z-index: 1;
}

.site-nav a:hover {
  color: var(--text);
}

.site-nav a.active {
  color: #fff;
}

.site-nav a svg { flex-shrink: 0; }

@media (max-width: 600px) {
  .site-nav a span { display: none; }
  .site-nav a { padding: 6px 10px; }
  .site-nav { gap: 1px; }
}

/* ── User menu (top-right) ── */
#user-menu {
  position: fixed; top: 12px; right: 12px;
  z-index: 9001;
}

#user-menu-btn {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface-hover);
  backdrop-filter: blur(16px) saturate(1.3);
  -webkit-backdrop-filter: blur(16px) saturate(1.3);
  box-shadow: 0 2px 16px rgba(var(--blue-rgb), 0.1);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  padding: 0;
  color: var(--text2);
  transition: border-color .18s, color .18s;
  overflow: hidden;
}

#user-menu-btn:hover { border-color: var(--blue); color: var(--text); }

#user-menu-btn img {
  width: 100%; height: 100%; object-fit: cover;
}

#user-menu-btn .user-initial {
  font-size: 14px; font-weight: 600;
  color: #fff;
  width: 100%; height: 100%;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--blue2), var(--blue));
}

#user-menu-dropdown {
  position: absolute; top: calc(100% + 8px); right: 0;
  min-width: 160px;
  background: var(--surface-hover);
  backdrop-filter: blur(16px) saturate(1.3);
  -webkit-backdrop-filter: blur(16px) saturate(1.3);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0,0,0,.15);
  padding: 8px;
  font-family: 'Noto Sans SC', 'PingFang SC', sans-serif;
  font-size: 13px;
}

#user-menu-dropdown:not([hidden]) { display: block; }

.user-menu-name {
  padding: 4px 8px 8px;
  font-weight: 600;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  margin-bottom: 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 200px;
}

.user-menu-hint {
  padding: 4px 8px;
  color: var(--text2);
  line-height: 1.5;
}

.user-menu-action {
  display: block; width: 100%;
  padding: 6px 8px;
  border: none; background: none;
  border-radius: 8px;
  color: var(--text2);
  font-size: 13px;
  cursor: pointer;
  text-align: left;
  text-decoration: none;
  transition: background .15s, color .15s;
  box-sizing: border-box;
}

.user-menu-action:hover {
  background: var(--surface-active, rgba(0,0,0,.06));
  color: var(--text);
}

.user-menu-action.danger:hover {
  background: rgba(220,60,60,.1);
  color: #dc3c3c;
}

/* ── Swipe-to-navigate preview ── */
.swipe-preview {
  position: fixed;
  inset: 0;
  z-index: 50;
  pointer-events: none;
  overflow: hidden;
  will-change: transform;
  /* Transparent so the page background/decorations show through consistently */
  background: transparent;
}
.swipe-preview-inner {
  position: absolute;
  inset: 0;
  overflow: hidden;
}
body.swiping #page-content {
  will-change: transform;
  /* Prevent content below from jiggling during drag */
  overflow-x: clip;
}
body.swiping {
  /* Disable horizontal scroll bleed during swipe */
  overflow-x: hidden;
}
.swipe-anim {
  transition: transform .28s cubic-bezier(0.22, 0.9, 0.32, 1) !important;
}