.page-features-advanced {
  --adv-gap: var(--space-4);
  --adv-soft: color-mix(in srgb, var(--color-primary-soft) 72%, var(--color-surface));
  --adv-border: var(--border-thin) solid var(--color-line);
  --adv-ink-soft: color-mix(in srgb, var(--color-ink-soft) 100%, transparent);
  --adv-dark-line: var(--color-contrast-line);
  --adv-dark-ink: var(--color-contrast-ink);
  --adv-dark-muted: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
  background: var(--color-surface);
  color: var(--color-ink);
}

/* ---------- 面包屑 ---------- */
.page-features-advanced .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  padding-top: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-features-advanced .breadcrumb a {
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: var(--border-thin) dotted var(--color-line);
}

.page-features-advanced .breadcrumb a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.page-features-advanced .breadcrumb [aria-current="page"] {
  color: var(--color-ink);
}

/* ---------- 通用区块 ---------- */
.page-features-advanced .adv-sec {
  padding: var(--space-8) 0;
}

.page-features-advanced .adv-sec--alt {
  background: var(--color-surface-alt);
}

.page-features-advanced .adv-link {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 45%, transparent);
}

.page-features-advanced .adv-link:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.page-features-advanced .adv-head {
  display: grid;
  gap: var(--space-2);
  padding-bottom: var(--space-4);
  margin-bottom: var(--space-6);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-features-advanced .adv-head .section-index {
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  line-height: 1;
  color: var(--color-primary);
  letter-spacing: var(--tracking-heading);
  transition: color 200ms ease;
}

.page-features-advanced .adv-head:hover .section-index,
.page-features-advanced .adv-head:focus-within .section-index {
  color: var(--color-accent);
}

.page-features-advanced .adv-head h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

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

/* ---------- 开篇 ---------- */
.page-features-advanced .adv-open {
  padding-top: var(--space-6);
}

.page-features-advanced .adv-open__grid {
  display: grid;
  gap: var(--space-6);
}

.page-features-advanced .adv-open__copy .kicker {
  display: block;
  margin-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
  letter-spacing: 0.08em;
}

.page-features-advanced .adv-open__copy h1 {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-features-advanced .adv-open__copy .lede {
  margin: 0 0 var(--space-3);
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

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

.page-features-advanced .adv-open__aside {
  display: grid;
  gap: var(--space-3);
}

/* ---------- 媒体框 ---------- */
.page-features-advanced .adv-media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--color-contrast-surface);
}

.page-features-advanced .adv-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-features-advanced .adv-media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: var(--space-3);
  background: var(--overlay-scrim);
  color: var(--color-contrast-ink);
  font-size: var(--text-xs);
  line-height: var(--leading-body);
}

/* ---------- 关键数字 ---------- */
.page-features-advanced .adv-nums {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-2);
  margin: 0;
}

.page-features-advanced .adv-num {
  padding: var(--space-3) var(--space-2);
  border: var(--adv-border);
  border-radius: var(--radius-sm);
  background: var(--adv-soft);
  text-align: center;
}

.page-features-advanced .adv-num__fig {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  line-height: 1;
  color: var(--color-primary);
}

.page-features-advanced .adv-num__lab {
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-soft);
  line-height: 1.3;
}

/* ---------- 情形卡片 ---------- */
.page-features-advanced .adv-cases {
  display: grid;
  gap: var(--space-4);
}

.page-features-advanced .adv-case {
  display: grid;
  gap: var(--space-3);
  align-content: start;
  padding: var(--space-4);
  border: var(--adv-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--color-primary) 12%, transparent);
}

.page-features-advanced .adv-case__tag {
  justify-self: start;
}

.page-features-advanced .adv-case h3 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-features-advanced .adv-case__check {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-features-advanced .adv-case__key {
  display: block;
  margin-bottom: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-features-advanced .disclosure-trigger {
  padding: var(--space-1) var(--space-3);
  border: var(--border-thin) solid var(--color-primary);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: background-color 200ms ease, color 200ms ease;
}

.page-features-advanced .disclosure-trigger:hover {
  background: var(--color-primary-soft);
}

.page-features-advanced .disclosure-trigger:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.page-features-advanced .disclosure-trigger[aria-expanded="true"] {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-features-advanced .disclosure-body {
  margin-top: var(--space-2);
  padding-top: var(--space-3);
  border-top: var(--border-thin) dotted var(--color-line);
}

.page-features-advanced .disclosure-body p {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

/* ---------- 档位衔接（深色带） ---------- */
.page-features-advanced .adv-tier {
  position: relative;
  overflow: hidden;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-features-advanced .adv-tier__bg {
  position: absolute;
  inset: 0;
}

.page-features-advanced .adv-tier__bg img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.34;
}

.page-features-advanced .adv-tier__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}

.page-features-advanced .adv-tier__inner {
  position: relative;
  z-index: 1;
}

.page-features-advanced .adv-tier .adv-head {
  border-bottom-color: var(--color-contrast-line);
}

.page-features-advanced .adv-tier .adv-head h2 {
  color: var(--color-contrast-ink);
}

.page-features-advanced .adv-tier .adv-head p {
  color: var(--adv-dark-muted);
}

.page-features-advanced .adv-tier .adv-head .section-index {
  color: var(--color-contrast-accent);
}

.page-features-advanced .adv-flow__legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--adv-dark-muted);
}

.page-features-advanced .adv-flow__legend-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.page-features-advanced .adv-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-contrast-line);
}

.page-features-advanced .adv-dot--on {
  background: var(--color-contrast-accent);
}

.page-features-advanced .adv-dot--part {
  background: transparent;
  box-shadow: inset 0 0 0 2px var(--color-contrast-accent);
}

.page-features-advanced .adv-flow {
  display: flex;
  gap: var(--space-2);
  padding: var(--space-2) 0 var(--space-3);
  margin-bottom: var(--space-4);
  overflow-x: auto;
}

.page-features-advanced .adv-flow__node {
  flex: 0 0 auto;
  display: grid;
  gap: var(--space-1);
  min-width: 74px;
  padding: var(--space-2) var(--space-3);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--color-contrast-surface) 62%, transparent);
  text-align: center;
}

.page-features-advanced .adv-flow__node--edge {
  border-color: color-mix(in srgb, var(--color-contrast-accent) 55%, var(--color-contrast-line));
}

.page-features-advanced .adv-flow__node--peak {
  border-color: var(--color-contrast-accent);
  box-shadow: 0 0 20px color-mix(in srgb, var(--color-contrast-accent) 38%, transparent);
}

.page-features-advanced .adv-flow__fig {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  line-height: 1;
  color: var(--color-contrast-ink);
}

.page-features-advanced .adv-flow__dots {
  display: flex;
  justify-content: center;
  gap: 4px;
}

.page-features-advanced .adv-table-wrap {
  overflow-x: auto;
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
}

.page-features-advanced .adv-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.page-features-advanced .adv-table__caption {
  padding: var(--space-2) var(--space-3);
  text-align: left;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--adv-dark-muted);
  border-bottom: var(--border-thin) dotted var(--color-contrast-line);
}

.page-features-advanced .adv-table th,
.page-features-advanced .adv-table td {
  padding: var(--space-2) var(--space-3);
  text-align: left;
  border-bottom: var(--border-thin) dotted var(--color-contrast-line);
  vertical-align: top;
}

.page-features-advanced .adv-table thead th {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.06em;
  color: var(--color-contrast-accent);
  background: color-mix(in srgb, var(--color-contrast-ink) 8%, transparent);
}

.page-features-advanced .adv-table tbody th {
  font-family: var(--font-mono);
  font-weight: var(--weight-body);
  color: var(--color-contrast-ink);
  white-space: nowrap;
}

.page-features-advanced .adv-table tbody td {
  color: var(--adv-dark-muted);
}

.page-features-advanced .adv-table tbody tr:last-child th,
.page-features-advanced .adv-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-features-advanced .adv-table__yes {
  color: var(--color-contrast-ink) !important;
}

.page-features-advanced .adv-table__part {
  color: var(--color-contrast-accent) !important;
}

.page-features-advanced .adv-table__no {
  color: color-mix(in srgb, var(--color-contrast-ink) 50%, transparent) !important;
}

.page-features-advanced .adv-tier__note {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: baseline;
  margin: var(--space-4) 0 0;
  padding: var(--space-3) var(--space-4);
  border-left: 3px solid var(--color-contrast-accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: color-mix(in srgb, var(--color-contrast-ink) 9%, transparent);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
}

.page-features-advanced .adv-tier__note-key {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
}

/* ---------- 换完之后看什么 ---------- */
.page-features-advanced .adv-after__grid {
  display: grid;
  gap: var(--space-6);
}

.page-features-advanced .adv-after__list {
  display: grid;
  gap: 0;
}

.page-features-advanced .adv-after__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: var(--border-thin) dotted var(--color-line);
}

.page-features-advanced .adv-after__fig {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  line-height: 1;
  color: var(--color-primary);
}

.page-features-advanced .adv-after__item h3 {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-features-advanced .adv-after__item p {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-features-advanced .adv-media--square {
  border-radius: var(--radius-sm);
}

/* ---------- 对照 ---------- */
.page-features-advanced .adv-compare__legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.page-features-advanced .adv-compare__legend-item {
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-pill);
}

.page-features-advanced .adv-compare__legend-item--stay {
  background: var(--color-surface-deep);
  color: var(--color-ink-soft);
}

.page-features-advanced .adv-compare__legend-item--move {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-features-advanced .adv-compare {
  display: grid;
  gap: var(--space-3);
}

.page-features-advanced .adv-compare__row {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-3);
  border: var(--adv-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
}

.page-features-advanced .adv-compare__key {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-features-advanced .adv-compare__cell {
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

.page-features-advanced .adv-compare__cell--stay {
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  color: var(--color-ink-soft);
}

.page-features-advanced .adv-compare__cell--move {
  background: var(--adv-soft);
  border: var(--border-thin) solid var(--color-primary);
  color: var(--color-ink);
}

.page-features-advanced .adv-compare__cell-tag {
  display: block;
  margin-bottom: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-features-advanced .adv-compare__cell--move .adv-compare__cell-tag {
  color: var(--color-primary);
}

.page-features-advanced .adv-compare__note {
  margin: var(--space-4) 0 0;
  padding-left: var(--space-3);
  border-left: 3px solid var(--color-accent);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 协助（深色收尾） ---------- */
.page-features-advanced .adv-help {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-features-advanced .adv-help .adv-head {
  border-bottom-color: var(--color-contrast-line);
}

.page-features-advanced .adv-help .adv-head h2 {
  color: var(--color-contrast-ink);
}

.page-features-advanced .adv-help .adv-head p {
  color: var(--adv-dark-muted);
}

.page-features-advanced .adv-help .adv-head .section-index {
  color: var(--color-contrast-accent);
}

.page-features-advanced .adv-help__list {
  display: grid;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-features-advanced .adv-help__item {
  padding: var(--space-4);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--color-contrast-ink) 6%, transparent);
}

.page-features-advanced .adv-help__item h3 {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-contrast-ink);
}

.page-features-advanced .adv-help__item p {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--adv-dark-muted);
}

.page-features-advanced .adv-link--dark {
  color: var(--color-contrast-accent);
  border-bottom-color: color-mix(in srgb, var(--color-contrast-accent) 55%, transparent);
}

.page-features-advanced .adv-link--dark:hover {
  color: var(--color-contrast-ink);
  border-bottom-color: var(--color-contrast-ink);
}

.page-features-advanced .adv-contact {
  display: grid;
  gap: var(--space-2);
  margin-top: var(--space-6);
  padding: var(--space-4);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
}

.page-features-advanced .adv-contact__head {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-1);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
}

.page-features-advanced .adv-contact__row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: 0;
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thin) dotted var(--color-contrast-line);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

.page-features-advanced .adv-contact__key {
  flex: 0 0 auto;
  min-width: 76px;
  color: var(--color-contrast-accent);
}

.page-features-advanced .adv-contact__val {
  color: var(--color-contrast-ink);
  word-break: break-word;
}

.page-features-advanced .adv-contact__note {
  margin: var(--space-1) 0 0;
  font-size: var(--text-xs);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent);
}

.page-features-advanced .adv-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.page-features-advanced .adv-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: box-shadow 200ms ease, background-color 200ms ease, color 200ms ease;
}

.page-features-advanced .adv-btn:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.page-features-advanced .btn--accent.adv-btn {
  background: var(--color-accent);
  color: var(--color-accent-ink);
  border: var(--border-thin) solid var(--color-accent);
}

.page-features-advanced .btn--accent.adv-btn:hover {
  box-shadow: var(--shadow-2);
}

.page-features-advanced .adv-btn--ghost-dark {
  background: transparent;
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-contrast-line);
}

.page-features-advanced .adv-btn--ghost-dark:hover {
  border-color: var(--color-contrast-accent);
  color: var(--color-contrast-accent);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-features-advanced .adv-open__copy h1 {
    font-size: var(--text-3xl);
  }

  .page-features-advanced .adv-head h2 {
    font-size: var(--text-2xl);
  }

  .page-features-advanced .adv-sec {
    padding: var(--space-8) 0 var(--section-y);
  }

  .page-features-advanced .adv-tier__note {
    flex-wrap: nowrap;
  }
}

@media (min-width: 800px) {
  .page-features-advanced .adv-cases {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-6) var(--space-4);
    align-items: start;
  }

  .page-features-advanced .adv-case:nth-child(even) {
    margin-top: var(--space-8);
  }

  .page-features-advanced .adv-compare__row {
    grid-template-columns: 116px minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
    gap: var(--space-3);
    padding: var(--space-4);
  }

  .page-features-advanced .adv-help__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-features-advanced .adv-sec {
    padding: var(--section-y-lg) 0;
  }

  .page-features-advanced .adv-open {
    padding-top: var(--section-y);
  }

  .page-features-advanced .adv-open__copy h1 {
    font-size: var(--text-4xl);
  }

  .page-features-advanced .adv-open__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: var(--space-8);
    align-items: start;
  }

  .page-features-advanced .adv-open__aside {
    transform: translateX(calc(var(--space-4) * -1));
  }

  .page-features-advanced .adv-head {
    grid-template-columns: 96px minmax(0, 1fr);
    grid-template-areas:
      "idx title"
      "idx lede";
    column-gap: var(--space-4);
    align-items: start;
  }

  .page-features-advanced .adv-head .section-index {
    grid-area: idx;
    font-size: var(--text-4xl);
  }

  .page-features-advanced .adv-head h2 {
    grid-area: title;
  }

  .page-features-advanced .adv-head p {
    grid-area: lede;
  }

  .page-features-advanced .adv-after__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.6fr);
    gap: var(--space-8);
    align-items: end;
  }

  .page-features-advanced .adv-contact {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-features-advanced .adv-actions {
    gap: var(--space-4);
  }
}