/* ============================================================
   Shared top navigation (landing page + blog pages).
   Also removes the Chirpy sidebar from blog pages while keeping
   the empty `#sidebar` node that the theme JS expects.
   Loaded on every page via _includes/metadata-hook.html.
   ============================================================ */

/* ------------------------------------------------------------
   Top navigation bar
   ------------------------------------------------------------ */
.pf-nav {
  position: sticky;
  top: 0;
  z-index: 1030;
  background: color-mix(in srgb, var(--main-bg) 86%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--main-border-color);
}

.pf-nav-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  height: 4rem;
}

.pf-nav-brand {
  font-weight: 700;
  font-size: 1rem;
  color: var(--heading-color);
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.pf-nav-brand:hover {
  text-decoration: none;
  color: var(--link-color);
}

.pf-nav-links {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.pf-nav-links a {
  color: var(--text-muted-color);
  font-size: 0.95rem;
  font-weight: 600;
  white-space: nowrap;
}

.pf-nav-links a:hover,
.pf-nav-links a.pf-active {
  color: var(--link-color);
  text-decoration: none;
}

.pf-nav-sep {
  width: 1px;
  height: 1.25rem;
  background: var(--main-border-color);
}

.pf-nav-socials {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.pf-mode-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 50%;
  border: 1px solid var(--btn-border-color);
  background: var(--button-bg);
  color: var(--text-color);
  cursor: pointer;
  font-size: 0.95rem;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.pf-mode-toggle:hover {
  color: var(--link-color);
  border-color: var(--link-color);
}

.pf-nav-toggle {
  display: none;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 0.4rem;
}

.pf-nav-toggle span {
  display: block;
  width: 1.4rem;
  height: 2px;
  margin: 4px 0;
  background: var(--heading-color);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* ------------------------------------------------------------
   Blog pages: remove the Chirpy sidebar chrome
   (the landing page handles its own chrome in style.css)
   ------------------------------------------------------------ */
#sidebar {
  display: none !important;
}

#main-wrapper {
  margin-left: 0 !important;
}

#sidebar-trigger {
  display: none !important;
}

/* ------------------------------------------------------------
   Responsive
   ------------------------------------------------------------ */
@media (max-width: 860px) {
  .pf-nav-toggle {
    display: block;
  }

  .pf-nav-links {
    position: absolute;
    top: 4rem;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--menu-bg);
    border-bottom: 1px solid var(--main-border-color);
    box-shadow: var(--menu-shadow-color) 0 12px 24px;
    padding: 0.5rem 1.5rem 1rem;
    display: none;
  }

  .pf-nav-links.pf-open {
    display: flex;
  }

  .pf-nav-links li {
    border-bottom: 1px solid var(--main-border-color);
  }

  .pf-nav-links li:last-child {
    border-bottom: 0;
  }

  .pf-nav-links a,
  .pf-nav-links .pf-mode-toggle {
    display: block;
    padding: 0.8rem 0;
    width: auto;
    height: auto;
    border-radius: 0;
    background: none;
    border: 0;
    font-size: 0.95rem;
  }

  .pf-nav-socials {
    gap: 1.5rem;
  }

  .pf-nav-sep {
    display: none;
  }
}