/* Shared portfolio shell — top tabs + layout offset */
:root {
  --pf-nav-h: 52px;
  --pf-nav-bg: #0a0e14;
  --pf-nav-border: #1e2a3a;
  --pf-nav-text: #9aabc0;
  --pf-nav-text-active: #f0f4f8;
  --pf-nav-accent: #3d8bfd;
  --pf-nav-font: "IBM Plex Sans KR", "Pretendard", "Apple SD Gothic Neo", "Noto Sans KR", system-ui, sans-serif;
}

.pf-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--pf-nav-h);
  z-index: 10000;
  display: flex;
  align-items: stretch;
  background: var(--pf-nav-bg);
  border-bottom: 1px solid var(--pf-nav-border);
  font-family: var(--pf-nav-font);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.03);
}

.pf-nav__brand {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0 1.1rem;
  border-right: 1px solid var(--pf-nav-border);
  text-decoration: none;
  color: var(--pf-nav-text-active);
  font-weight: 600;
  font-size: 0.88rem;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.pf-nav__brand span {
  color: var(--pf-nav-accent);
  font-weight: 700;
}

.pf-nav__tabs {
  display: flex;
  align-items: stretch;
  overflow-x: auto;
  flex: 1;
  scrollbar-width: thin;
  scrollbar-color: var(--pf-nav-border) transparent;
  -webkit-overflow-scrolling: touch;
}

.pf-nav__tabs::-webkit-scrollbar {
  height: 3px;
}

.pf-nav__tabs a {
  display: flex;
  align-items: center;
  padding: 0 0.95rem;
  color: var(--pf-nav-text);
  text-decoration: none;
  font-size: 0.78rem;
  font-weight: 500;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.pf-nav__tabs a:hover {
  color: var(--pf-nav-text-active);
  background: rgba(255, 255, 255, 0.03);
}

.pf-nav__tabs a.is-active {
  color: var(--pf-nav-text-active);
  border-bottom-color: var(--pf-nav-accent);
  background: rgba(61, 139, 253, 0.08);
}

.pf-nav__group {
  display: none;
}

/* Body offset when top nav is present */
body.has-pf-nav {
  padding-top: var(--pf-nav-h) !important;
}

body.has-pf-nav section,
body.has-pf-nav [id] {
  scroll-margin-top: calc(var(--pf-nav-h) + 16px);
}

/* Fixed / sticky sidebars clear the top nav */
body.has-pf-nav aside.toc {
  top: calc(var(--pf-nav-h) + 1rem) !important;
  max-height: calc(100vh - var(--pf-nav-h) - 2rem) !important;
  height: auto !important;
}

@media (max-width: 860px) {
  .pf-nav__brand {
    padding: 0 0.75rem;
    font-size: 0.8rem;
  }

  .pf-nav__tabs a {
    padding: 0 0.7rem;
    font-size: 0.72rem;
  }
}