/* ─── NAV BASE STYLES ─── */

/* Topbar */
.topbar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: var(--topbar-h);
  z-index: 100;
  background: rgba(8, 12, 20, 0.90);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  padding: 0 var(--page-pad) 10px;
}

.topbar-logo {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  background: linear-gradient(135deg, white, var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.topbar-actions {
  display: flex;
  gap: 10px;
}

.topbar-icon-btn {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-size: 16px;
  transition: border-color 160ms;
}

.topbar-icon-btn:hover {
  border-color: rgba(255, 255, 255, 0.2);
}

.topbar-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
}

/* Bottom Navigation */
.bottom-nav {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: calc(var(--nav-h) + var(--safe-b));
  padding-bottom: var(--safe-b);
  z-index: 100;
  background: rgba(8, 12, 20, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--border);
  display: flex;
}

.nav-tab {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  position: relative;
  min-height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.nav-tab-indicator {
  position: absolute;
  top: 0;
  width: 50%;
  height: 2px;
  border-radius: 1px;
  opacity: 0;
  transition: opacity 160ms;
}

.nav-tab.active .nav-tab-indicator {
  opacity: 1;
}

.nav-tab-icon {
  font-size: 20px;
  color: var(--muted);
  transition: color 160ms;
}

.nav-tab.active .nav-tab-icon {
  color: var(--accent);
}

.nav-tab.active.create .nav-tab-icon {
  color: var(--accent2);
}

.nav-tab-label {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.3px;
  color: var(--muted);
  transition: color 160ms;
}

.nav-tab.active .nav-tab-label {
  color: var(--accent);
}

.nav-tab.active.create .nav-tab-label {
  color: var(--accent2);
}

/* System Banner */
.system-banner {
  background: rgba(255, 77, 109, 0.12);
  border-bottom: 1px solid rgba(255, 77, 109, 0.25);
  padding: 8px var(--page-pad);
  font-size: 12px;
  font-weight: 400;
  color: var(--red);
  text-align: center;
}

/* Sidebar (PC — hidden by default) */
.sidebar {
  display: none;
}