.page-chrome {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.35rem;
}

.page-masthead {
  margin-bottom: 1.35rem;
  padding: 0 0 0.95rem;
  border-bottom: 1px solid var(--line);
}

.page-brand {
  margin-bottom: 0.95rem;
}

.page-masthead h1 {
  margin-bottom: 0.65rem;
}

.page-nav {
  display: flex;
  gap: 0.5rem;
}

.page-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  color: var(--text);
  border: 1px solid transparent;
  border-radius: 0.5rem;
  background: rgba(255, 255, 255, 0.04);
  padding: 0.45rem 0.78rem;
  text-decoration: none;
  white-space: nowrap;
}

.page-nav a[aria-current="page"] {
  background: rgba(228, 90, 85, 0.14);
  border-color: rgba(228, 90, 85, 0.36);
  color: var(--accent-strong);
}

.page-nav a:hover {
  border-color: var(--line);
  color: var(--accent-strong);
}

.language-menu {
  position: relative;
  flex: 0 0 auto;
}

.language-menu summary {
  align-items: center;
  background: transparent;
  border: 1px solid rgba(183, 200, 189, 0.18);
  border-radius: 0.5rem;
  color: var(--muted);
  cursor: pointer;
  display: inline-flex;
  font-weight: 600;
  gap: 0.32rem;
  list-style: none;
  min-height: 2.75rem;
  padding: 0.45rem 0.68rem;
  white-space: nowrap;
}

.language-menu[open] summary,
.language-menu summary:hover {
  background: rgba(255, 255, 255, 0.035);
  border-color: rgba(228, 90, 85, 0.32);
  color: var(--accent-strong);
}

.language-menu summary::-webkit-details-marker {
  display: none;
}

.language-menu summary::after {
  content: "⌄";
  color: rgba(183, 200, 189, 0.72);
  font-size: 0.72rem;
  line-height: 1;
}

.language-menu[open] summary::after,
.language-menu summary:hover::after {
  color: var(--accent-strong);
}

.language-options {
  background: var(--surface-deep);
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  box-shadow: var(--shadow);
  gap: 0.25rem;
  min-width: 9.5rem;
  padding: 0.4rem;
  position: absolute;
  right: 0;
  top: calc(100% + 0.45rem);
  z-index: 10;
}

.language-menu:not([open]) .language-options {
  display: none;
}

.language-menu[open] .language-options {
  display: grid;
}

.language-options a {
  display: flex;
  align-items: center;
  min-height: 2.5rem;
  border-radius: 0.375rem;
  color: var(--text);
  padding: 0.5rem 0.6rem;
  text-decoration: none;
}

.language-options a:hover,
.language-options a[aria-current="true"] {
  background: rgba(228, 90, 85, 0.14);
  color: var(--accent-strong);
}

.language-current-short {
  display: none;
}

.notice,
.callout,
.doc-section,
.faq-item {
  border: 1px solid var(--line);
  background: var(--surface-deep);
  padding: 1rem;
  border-radius: 0.5rem;
}

.notice,
.callout {
  border-color: var(--line-warm);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.card {
  display: block;
  min-height: 9rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: linear-gradient(180deg, var(--surface-strong), var(--surface));
  color: var(--text);
  box-shadow: var(--shadow);
  text-decoration: none;
}

.card:hover {
  border-color: var(--line-accent);
  background: linear-gradient(180deg, var(--surface-raised), var(--surface));
}

.card span {
  display: block;
  color: var(--muted);
  margin-top: 0.5rem;
}

.doc-section-list,
.faq-list {
  display: grid;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.doc-section {
  box-shadow: var(--shadow);
}

.doc-section h2 {
  margin-top: 0;
  font-size: 1.12rem;
}

.doc-section p:last-child,
.faq-item p:last-child {
  margin-bottom: 0;
}

.faq-item {
  padding: 0;
  overflow: hidden;
}

.faq-item summary {
  cursor: pointer;
  font-weight: 800;
  list-style: none;
  min-height: 3.25rem;
  padding: 1rem 2.75rem 1rem 1rem;
  position: relative;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 1rem;
  top: 50%;
  color: var(--accent-strong);
  font-size: 1.25rem;
  line-height: 1;
  transform: translateY(-50%);
}

.faq-item[open] summary {
  border-bottom: 1px solid var(--line);
  color: var(--accent-strong);
}

.faq-item[open] summary::after {
  content: "-";
}

.faq-item p {
  color: var(--muted);
  margin: 0;
  padding: 1rem;
}

@media (max-width: 640px) {
  .page-chrome {
    gap: 0.5rem;
  }

  .page-nav {
    min-width: 0;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .page-nav::-webkit-scrollbar {
    display: none;
  }

  .page-nav a,
  .language-menu summary {
    font-size: 0.9rem;
    padding: 0.35rem 0.58rem;
  }

  .language-menu summary {
    padding-inline: 0.4rem;
  }

  .language-current-label {
    display: none;
  }

  .language-current-short {
    display: inline;
  }

  .page-masthead {
    margin-bottom: 1.15rem;
    padding-bottom: 0.8rem;
  }

  .page-guide h1 {
    font-size: 2.2rem;
    max-width: none;
  }

  .doc-section-list,
  .faq-list {
    margin-top: 1.125rem;
  }
}