.page-features {
  --feat-block-gap: clamp(var(--space-4), 4vw, var(--space-6));
  --feat-figure-min: 10ch;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-features .feat-hero {
  position: relative;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  overflow: hidden;
}

.page-features .feat-hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 60%;
}

.page-features .feat-hero__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}

.page-features .feat-hero__inner {
  position: relative;
  z-index: 1;
  padding-top: var(--space-6);
  padding-bottom: var(--section-y);
}

.page-features .feat-hero .breadcrumb {
  margin-bottom: var(--space-6);
}

.page-features .feat-hero .breadcrumb a,
.page-features .feat-hero .breadcrumb__list li {
  color: var(--color-contrast-ink);
}

.page-features .feat-hero__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-contrast-accent);
}

.page-features .feat-hero__title {
  margin: var(--space-3) 0 0;
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}

.page-features .feat-hero__lede {
  max-width: var(--measure);
  margin: var(--space-4) 0 0;
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
}

.page-features .feat-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: var(--space-8) 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--border-thin) solid var(--color-contrast-line);
  border-left: var(--border-thin) solid var(--color-contrast-line);
}

.page-features .feat-fig {
  padding: var(--space-3);
  border-right: var(--border-thin) solid var(--color-contrast-line);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.page-features .feat-fig__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--color-contrast-ink);
}

.page-features .feat-fig__label {
  display: block;
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
}

.page-features .feat-fig__unit {
  display: block;
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-contrast-accent);
}

/* ---------- 分组索引 ---------- */
.page-features .cap-index {
  margin: var(--space-6) 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-features .cap-index__item {
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-features .cap-index__item a {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-4) 0;
  text-decoration: none;
  color: var(--color-ink);
  transition: padding-left 160ms ease-out, color 160ms ease-out;
}

.page-features .cap-index__item a:hover,
.page-features .cap-index__item a:focus-visible {
  padding-left: var(--space-2);
}

.page-features .cap-index__code {
  color: var(--color-ink-muted);
}

.page-features .cap-index__name {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  line-height: var(--leading-heading);
}

.page-features .cap-index__desc {
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-features .cap-index__count {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-primary);
}

/* ---------- 筛选条 ---------- */
.page-features .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-6);
}

.page-features .filter-empty {
  margin: var(--space-4) 0 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

/* ---------- 指标分组 ---------- */
.page-features .cap-group {
  margin-top: var(--space-8);
  padding-top: var(--space-8);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-features .cap-group__body {
  display: grid;
  gap: var(--feat-block-gap);
}

.page-features .cap-group__media {
  margin: 0;
}

.page-features .cap-group__head {
  display: grid;
  gap: var(--space-2);
  padding-bottom: var(--space-4);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-features .cap-group__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-primary);
}

.page-features .cap-group__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
}

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

.page-features .metrics {
  display: grid;
  gap: 0;
  margin: var(--space-6) 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-features .metric {
  padding: var(--space-4) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-features .metric__cat {
  margin: 0 0 var(--space-2);
  color: var(--color-ink-muted);
}

.page-features .metric__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-4xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--color-ink);
}

.page-features .metric__name {
  margin: var(--space-2) 0 0;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
}

.page-features .metric__desc {
  margin: var(--space-2) 0 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-features .metric__fields {
  display: grid;
  gap: var(--space-1);
  margin: var(--space-3) 0 0;
}

.page-features .metric__field {
  display: flex;
  gap: var(--space-2);
  align-items: baseline;
}

.page-features .metric__field dt {
  flex: 0 0 5.5ch;
  color: var(--color-ink-muted);
}

.page-features .metric__field dd {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink);
}

.page-features .metric__field dd a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-features .metric__field dd a:hover,
.page-features .metric__field dd a:focus-visible {
  color: var(--color-accent);
}

/* ---------- 口径表 ---------- */
.page-features .rules-table {
  margin-top: var(--space-6);
}

.page-features .rules-table__caption {
  padding-bottom: var(--space-2);
  text-align: left;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

/* ---------- 能力边界 ---------- */
.page-features .cap-boundary {
  padding: var(--space-6);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-features .cap-boundary .section-head__index {
  color: var(--color-contrast-accent);
}

.page-features .cap-boundary .section-head__title {
  margin: var(--space-2) 0 0;
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}

.page-features .cap-boundary__cols {
  display: grid;
  gap: var(--space-6);
  margin-top: var(--space-6);
}

.page-features .cap-boundary__label {
  margin: 0 0 var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-body);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-contrast-accent);
}

.page-features .cap-boundary__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-features .cap-boundary__list li {
  position: relative;
  padding-left: var(--space-4);
  margin-bottom: var(--space-3);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
}

.page-features .cap-boundary__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: var(--space-2);
  height: var(--border-thin);
  background-color: var(--color-contrast-accent);
}

/* ---------- 交叉入口 ---------- */
.page-features .xref {
  margin: var(--space-6) 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-features .xref__item {
  padding: var(--space-4) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-features .xref__code {
  margin: 0 0 var(--space-2);
  color: var(--color-ink-muted);
}

.page-features .xref__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
}

.page-features .xref__title a {
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-primary);
  transition: color 140ms ease-out, border-color 140ms ease-out;
}

.page-features .xref__title a:hover,
.page-features .xref__title a:focus-visible {
  color: var(--color-primary);
}

.page-features .xref__desc {
  max-width: var(--measure);
  margin: var(--space-2) 0 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-features .feat-hero__inner {
    padding-top: var(--space-8);
  }

  .page-features .feat-figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-features .cap-index__item a {
    grid-template-columns: 12ch minmax(0, 1fr) auto;
    align-items: baseline;
    column-gap: var(--space-4);
    padding: var(--space-4) 0;
  }

  .page-features .cap-index__name {
    grid-column: 2 / 3;
  }

  .page-features .cap-index__desc {
    grid-column: 2 / 3;
  }

  .page-features .cap-index__count {
    grid-column: 3 / 4;
    grid-row: 1 / 2;
    text-align: right;
  }

  .page-features .cap-boundary {
    padding: var(--space-8);
  }

  .page-features .cap-boundary__cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: var(--space-8);
  }
}

@media (min-width: 900px) {
  .page-features .cap-group__body {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    column-gap: var(--feat-block-gap);
    align-items: start;
  }

  .page-features .metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: var(--space-8);
    margin-top: 0;
  }

  .page-features .cap-group__head {
    grid-template-columns: 6ch minmax(0, 1fr);
    align-items: baseline;
    column-gap: var(--space-3);
  }

  .page-features .cap-group__index {
    grid-row: 1 / 3;
  }

  .page-features .xref {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: var(--space-8);
    border-bottom: var(--border-thin) solid var(--color-line);
  }

  .page-features .xref__item {
    padding: var(--space-6) 0;
  }

  .page-features .xref__item:last-child {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1080px) {
  .page-features .cap-group__media {
    position: sticky;
    top: var(--space-6);
  }
}
</>