.page-features-advanced {
  --fa-axis: var(--space-1);
  --fa-indent: var(--space-3);
}

@media (min-width: 900px) {
  .page-features-advanced {
    --fa-axis: var(--space-2);
    --fa-indent: var(--space-6);
  }
}

/* ---------- 面包屑 ---------- */
.page-features-advanced .fa-crumb-wrap {
  padding-top: var(--space-4);
}

/* ---------- 首屏 ---------- */
.page-features-advanced .fa-intro {
  padding: var(--space-6) 0 var(--space-4);
}

.page-features-advanced .fa-intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  align-items: start;
}

@media (min-width: 900px) {
  .page-features-advanced .fa-intro-grid {
    grid-template-columns: minmax(0, 1.75fr) minmax(0, 1fr);
    gap: var(--space-8);
  }
}

.page-features-advanced .fa-h1 {
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  margin: var(--space-2) 0 0;
  max-width: 22ch;
}

@media (min-width: 720px) {
  .page-features-advanced .fa-h1 {
    font-size: var(--text-4xl);
  }
}

.page-features-advanced .fa-lede {
  margin-top: var(--space-3);
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.page-features-advanced .fa-toc {
  border-top: var(--border-thin) solid var(--color-line);
  padding-top: var(--space-2);
}

.page-features-advanced .fa-toc-title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
  margin: 0 0 var(--space-2);
}

.page-features-advanced .fa-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-3);
}

.page-features-advanced .fa-toc-link {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.1;
  color: var(--color-ink-soft);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: var(--border-thin) solid transparent;
  transition: color 180ms ease-out, border-color 180ms ease-out;
}

.page-features-advanced .fa-toc-link:hover,
.page-features-advanced .fa-toc-link[data-active] {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* ---------- 深色定位区块 ---------- */
.page-features-advanced .fa-position {
  position: relative;
  overflow: hidden;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding: var(--space-8) 0;
}

.page-features-advanced .fa-position::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, color-mix(in srgb, var(--color-contrast-line) 70%, transparent) var(--border-thin), transparent var(--border-thin)),
    linear-gradient(to bottom, color-mix(in srgb, var(--color-contrast-line) 70%, transparent) var(--border-thin), transparent var(--border-thin));
  background-size: calc(var(--space-8) + var(--space-4)) calc(var(--space-8) + var(--space-4));
  opacity: 0.55;
  pointer-events: none;
}

.page-features-advanced .fa-position-inner {
  position: relative;
  z-index: 1;
}

.page-features-advanced .fa-kicker {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-contrast-accent);
  margin: 0 0 var(--space-2);
}

.page-features-advanced .fa-h2 {
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  margin: 0;
}

@media (min-width: 900px) {
  .page-features-advanced .fa-h2 {
    font-size: var(--text-3xl);
  }
}

.page-features-advanced .fa-h2--on-dark {
  color: var(--color-contrast-ink);
  max-width: 24ch;
}

.page-features-advanced .fa-position-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-2);
  margin-top: var(--space-4);
}

@media (min-width: 900px) {
  .page-features-advanced .fa-position-cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-6);
  }
}

.page-features-advanced .fa-position-cols p {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 86%, transparent);
  max-width: var(--measure);
}

.page-features-advanced .fa-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3) var(--space-4);
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

@media (min-width: 720px) {
  .page-features-advanced .fa-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-features-advanced .fa-stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.page-features-advanced .fa-stat-num {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  line-height: 1.1;
  color: var(--color-contrast-ink);
}

.page-features-advanced .fa-stat-label {
  font-size: var(--text-sm);
  line-height: 1.4;
  color: color-mix(in srgb, var(--color-contrast-ink) 70%, transparent);
}

/* ---------- 章节头 ---------- */
.page-features-advanced .fa-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-2);
  align-items: end;
}

@media (min-width: 900px) {
  .page-features-advanced .fa-head {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: var(--space-6);
  }
}

.page-features-advanced .fa-head-note {
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-muted);
  max-width: var(--measure);
}

/* ---------- 单侧轴线结构 ---------- */
.page-features-advanced .fa-flow {
  position: relative;
  margin-top: var(--space-6);
}

.page-features-advanced .fa-flow::before {
  content: "";
  position: absolute;
  left: var(--fa-axis);
  top: 0;
  bottom: 0;
  width: var(--border-thin);
  background: var(--color-line);
}

.page-features-advanced .fa-flow > * {
  position: relative;
  padding-left: var(--fa-indent);
}

/* ---------- 图片 ---------- */
.page-features-advanced .fa-figure {
  margin: 0 0 var(--space-4);
}

.page-features-advanced .fa-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
  background: var(--color-surface-deep);
}

.page-features-advanced .fa-caption {
  display: block;
  padding-top: var(--space-2);
  font-size: var(--text-xs);
  line-height: 1.5;
  color: var(--color-ink-muted);
  max-width: var(--measure);
}

/* ---------- 能力条目 ---------- */
.page-features-advanced .cap {
  position: relative;
  border-bottom: var(--border-thin) solid var(--color-line);
  padding-bottom: var(--space-3);
  margin-bottom: var(--space-3);
}

.page-features-advanced .cap-mark {
  position: absolute;
  left: calc(var(--fa-axis) - 4px);
  top: calc(var(--space-3) + 2px);
  width: 8px;
  height: 8px;
  background: var(--color-primary);
  border-radius: 1px;
  z-index: 1;
}

.page-features-advanced .cap[open] .cap-mark {
  background: var(--color-accent);
}

.page-features-advanced .cap-sum {
  display: block;
  list-style: none;
  cursor: pointer;
  padding-right: var(--space-4);
}

.page-features-advanced .cap-sum::-webkit-details-marker {
  display: none;
}

.page-features-advanced .cap-sum::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: var(--text-base);
  line-height: 1;
  color: var(--color-ink-muted);
  transition: transform 200ms ease-out, color 200ms ease-out;
}

.page-features-advanced .cap[open] .cap-sum::after {
  content: "+";
  transform: rotate(45deg);
  color: var(--color-accent);
}

.page-features-advanced .cap-code {
  display: inline-block;
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-right: var(--space-2);
  vertical-align: middle;
}

.page-features-advanced .cap-name {
  display: inline-block;
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
  vertical-align: middle;
}

.page-features-advanced .cap-role {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-muted);
  max-width: var(--measure);
}

.page-features-advanced .cap-body {
  padding-top: var(--space-3);
}

.page-features-advanced .cap-specs {
  margin: 0;
  display: grid;
  gap: var(--space-2);
}

.page-features-advanced .cap-spec {
  display: grid;
  grid-template-columns: 5em minmax(0, 1fr);
  gap: var(--space-2);
  padding-top: var(--space-2);
  border-top: var(--border-thin) dotted var(--color-line);
}

.page-features-advanced .cap-spec dt {
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: var(--leading-body);
  color: var(--color-ink-muted);
}

.page-features-advanced .cap-spec dd {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
  max-width: var(--measure);
}

/* ---------- 适用条件 ---------- */
.page-features-advanced .fa-cond-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  align-items: start;
}

@media (min-width: 900px) {
  .page-features-advanced .fa-cond-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    gap: var(--space-8);
  }
}

.page-features-advanced .fa-cond-lede {
  margin: var(--space-3) 0 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.page-features-advanced .fa-cond-list {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
}

.page-features-advanced .fa-cond-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-2);
  align-items: start;
  padding: var(--space-2) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-features-advanced .fa-cond-tag {
  display: inline-block;
  font-size: var(--text-xs);
  line-height: 1.1;
  padding: 3px var(--space-1);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.page-features-advanced .fa-cond-tag--ok {
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

.page-features-advanced .fa-cond-tag--no {
  background: var(--color-highlight);
  color: var(--color-accent);
}

.page-features-advanced .fa-cond-text {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-features-advanced .fa-quote {
  margin: 0 0 var(--space-4);
  padding: var(--space-1) 0 var(--space-1) var(--space-3);
  border-left: var(--border-thick) solid var(--color-accent);
}

.page-features-advanced .fa-quote p {
  margin: 0;
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-ink);
  max-width: 34ch;
}

/* ---------- 差异对照表 ---------- */
.page-features-advanced .fa-table-wrap {
  margin-top: var(--space-6);
  overflow-x: auto;
  border-top: var(--border-thick) solid var(--color-ink);
}

.page-features-advanced .fa-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
}

.page-features-advanced .fa-table caption {
  text-align: left;
  padding: var(--space-2) 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-features-advanced .fa-table th,
.page-features-advanced .fa-table td {
  text-align: left;
  vertical-align: top;
  padding: var(--space-3) var(--space-3) var(--space-3) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-features-advanced .fa-table thead th {
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
}

.page-features-advanced .fa-table tbody th {
  font-weight: 600;
  color: var(--color-ink);
  white-space: nowrap;
}

.page-features-advanced .fa-table tbody tr:hover th,
.page-features-advanced .fa-table tbody tr:hover td {
  background: var(--color-primary-soft);
}

/* ---------- 相邻主题 ---------- */
.page-features-advanced .fa-next-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  align-items: start;
}

@media (min-width: 900px) {
  .page-features-advanced .fa-next-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr);
    gap: var(--space-8);
  }
}

.page-features-advanced .fa-next-text {
  margin: var(--space-3) 0 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.page-features-advanced .fa-link-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-features-advanced .fa-link-item {
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-features-advanced .fa-link {
  display: block;
  position: relative;
  padding: var(--space-3) var(--space-6) var(--space-3) 0;
  text-decoration: none;
  transition: background-color 180ms ease-out;
}

.page-features-advanced .fa-link::after {
  content: "→";
  position: absolute;
  right: 0;
  top: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-base);
  line-height: 1.2;
  color: var(--color-ink-muted);
  transition: transform 200ms ease-out, color 200ms ease-out;
}

.page-features-advanced .fa-link:hover::after,
.page-features-advanced .fa-link:focus-visible::after {
  color: var(--color-accent);
  transform: translateX(4px);
}

.page-features-advanced .fa-link-name {
  display: block;
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-features-advanced .fa-link:hover .fa-link-name {
  color: var(--color-primary);
}

.page-features-advanced .fa-link-desc {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-muted);
  max-width: var(--measure);
}

/* ---------- 焦点可见性 ---------- */
.page-features-advanced a:focus-visible,
.page-features-advanced summary:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
}
<<<END>>>