/* ═══════════════════════════════════════════
   PU-Connect — App Shell
   Top bar · Sidebar · Bottom nav · Layout
   ═══════════════════════════════════════════ */

/* ── Top bar ── */
.top-bar {
  position: sticky;
  top: 0;
  z-index: 400;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: 0 1rem;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
}

.top-bar-logo {
  text-decoration: none;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -.4px;
  color: var(--accent);
}
.top-bar-logo span { color: var(--text); }
.top-bar-logo-img {
  height: 36px;
  width: auto;
  display: block;
}

.top-bar-spacer { flex: 1; }

.top-bar-menu-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
  flex-shrink: 0;
}
.top-bar-menu-btn span {
  display: block;
  width: 16px;
  height: 1.5px;
  background: currentColor;
  border-radius: 2px;
  transition: transform .25s, opacity .25s;
}

/* ── Overlay ── */
.sb-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 500;
  background: rgba(0,0,0,.4);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  animation: fade-in .2s ease;
}
.sb-overlay.open { display: block; }

@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }

/* ── Sidebar ── */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--sidebar-w);
  z-index: 600;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transform: translateX(-100%);
  transition: transform .3s var(--ease-out);
  overflow-y: auto;
  overflow-x: hidden;
}
.sidebar.open { transform: translateX(0); }

.sb-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.1rem .8rem;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--surface);
  z-index: 1;
}

.sb-logo {
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: -.4px;
  color: var(--accent);
}
.sb-logo span { color: var(--text); }

.sb-close { color: var(--text-2); }

.sb-nav { padding: .5rem 0 1rem; flex: 1; }

.sb-section-label {
  font-size: .65rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-2);
  font-weight: 600;
  padding: .8rem 1.1rem .3rem;
}

.sb-nav ul { list-style: none; padding: 0 .5rem .25rem; }

.sb-link {
  display: flex;
  align-items: center;
  gap: .65rem;
  padding: .52rem .65rem;
  border-radius: var(--radius-sm);
  color: var(--text-2);
  font-size: .875rem;
  font-weight: 500;
  transition: all .15s var(--ease-out);
  text-decoration: none;
}
.sb-link svg { flex-shrink: 0; opacity: .7; }
.sb-link:hover { color: var(--text); background: var(--surface-2); }
.sb-link:hover svg { opacity: 1; }
.sb-link.active { color: var(--accent); background: var(--accent-dim); font-weight: 600; }
.sb-link.active svg { opacity: 1; }
.sb-logout { color: var(--danger) !important; }
.sb-logout:hover { background: var(--danger-dim) !important; }

.sb-divider { height: 1px; background: var(--border); margin: .4rem 1.1rem; }

.sb-footer {
  padding: .9rem 1.1rem;
  font-size: .7rem;
  color: var(--text-2);
  border-top: 1px solid var(--border);
  margin-top: auto;
}

/* ── Bottom nav ── */
.bot-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--bot-h);
  z-index: 400;
  display: flex;
  align-items: center;
  justify-content: space-around;
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-top: 1px solid var(--border);
  padding: 0 .5rem;
  padding-bottom: env(safe-area-inset-bottom);
  transition: transform .3s var(--ease-out);
}
.bot-nav.hidden { transform: translateY(100%); }

.bn-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .2rem;
  color: var(--text-2);
  text-decoration: none;
  font-size: .65rem;
  font-weight: 500;
  padding: .4rem .6rem;
  border-radius: var(--radius-sm);
  transition: color .15s, background .15s;
  min-width: 48px;
}
.bn-item svg { transition: transform .2s var(--ease-out); }
.bn-item:hover { color: var(--text); }
.bn-item:hover svg { transform: translateY(-1px); }
.bn-item.active { color: var(--accent); }
.bn-item.active svg { stroke: var(--accent); }

.bn-post {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: var(--accent);
  color: #fff !important;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px var(--accent-glow);
  transition: transform .2s var(--ease-out), box-shadow .2s;
  margin-top: -8px;
  flex-direction: row;
  gap: 0;
  font-size: 0;
  padding: 0;
}
.bn-post:hover { transform: scale(1.08); box-shadow: 0 8px 24px var(--accent-glow); }

/* ── Main layout ── */
.app-layout {
  display: flex;
  min-height: 100dvh;
}

.app-main {
  flex: 1;
  min-width: 0;
  padding-bottom: calc(var(--bot-h) + 16px);
}

.page-inner {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: var(--page-pad) var(--page-pad) 0;
}

/* ── Desktop: persistent sidebar ── */
@media (min-width: 960px) {
  .sidebar {
    transform: translateX(0);
    top: 0;
    position: sticky;
    height: 100dvh;
    border-right: 1px solid var(--border);
    flex-shrink: 0;
  }
  .sb-close { display: none; }
  .sb-overlay { display: none !important; }
  .top-bar-menu-btn { display: none; }
  .bot-nav { left: var(--sidebar-w); }
  .app-main { padding-bottom: calc(var(--bot-h) + 16px); }
}

@media (max-width: 959px) {
  .sidebar { position: fixed; }
}

/* ── Safe-area inset (iOS home bar) ── */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
  .bot-nav {
    padding-bottom: calc(.5rem + env(safe-area-inset-bottom));
    height: auto;
    min-height: var(--bot-h);
  }
  .app-main {
    padding-bottom: calc(var(--bot-h) + 16px + env(safe-area-inset-bottom));
  }
}

/* ── Mobile tweaks ── */
@media (max-width: 480px) {
  .page-inner { padding: 1rem var(--page-pad) 0; }
  .sidebar { width: min(var(--sidebar-w), 85vw); }
}

@media (max-width: 380px) {
  .top-bar { gap: .4rem; padding: 0 .65rem; height: var(--nav-h); }
  .top-bar-logo { font-size: 1rem; }
  .top-bar-logo-img { height: 28px; }
  .page-inner { padding: .85rem var(--page-pad) 0; }
  .bn-item { min-width: 40px; padding: .35rem .4rem; font-size: .6rem; }
  .bn-post { width: 42px; height: 42px; border-radius: 12px; }
}

/* ── Sidebar toggle script ── */