.page-features {
  display: block;
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

/* ---------- 面包屑 ---------- */
.page-features .feat-crumb {
  padding-top: var(--space-4);
  padding-bottom: var(--space-1);
}
.page-features .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}
.page-features .breadcrumb__item + .breadcrumb__item::before {
  content: "／";
  margin-right: 4px;
  color: var(--color-line);
}
.page-features .breadcrumb__item a {
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: 1px dotted var(--color-line);
}
.page-features .breadcrumb__item a:hover,
.page-features .breadcrumb__item a:focus-visible {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}
.page-features .breadcrumb__current {
  color: var(--color-ink);
  font-weight: 600;
}

/* ---------- 首屏 ---------- */
.page-features .feat-hero {
  padding-top: var(--space-3);
  padding-bottom: var(--space-8);
  border-bottom: 3px double var(--color-line);
}
.page-features .feat-hero__kicker {
  margin: 0 0 var(--space-3);
}
.page-features .feat-hero__kicker .mono {
  display: inline-block;
  padding: 2px var(--space-1);
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.page-features .feat-hero__title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  word-break: break-word;
}
.page-features .feat-hero__lede {
  max-width: var(--measure);
  margin: 0 0 var(--space-4);
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}
.page-features .feat-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}
.page-features .feat-hero__tags .tag--accent {
  background: var(--color-accent);
  color: var(--color-accent-ink);
  border-color: var(--color-accent);
}

/* ---------- 深色对照带 ---------- */
.page-features .feat-band {
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.page-features .feat-band__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  align-items: center;
}
.page-features .feat-band__nums {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}
.page-features .feat-band__cell {
  padding-top: var(--space-2);
  border-top: 1px solid var(--color-contrast-line);
}
.page-features .feat-band__cell.is-accent {
  border-top-color: var(--color-contrast-accent);
}
.page-features .feat-band__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-contrast-ink);
}
.page-features .feat-band__cell.is-accent .feat-band__num {
  color: var(--color-contrast-accent);
}
.page-features .feat-band__label {
  display: block;
  margin-top: var(--space-1);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--text-base);
  letter-spacing: 0.04em;
}
.page-features .feat-band__meta {
  display: block;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}
.page-features .feat-band__figure {
  margin: 0;
}
.page-features .feat-band__figure .figure__frame {
  border: 1px solid var(--color-contrast-line);
}
.page-features .feat-band__figure .figure__cap {
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent);
}

/* ---------- 通用图框 ---------- */
.page-features .figure {
  margin: 0;
}
.page-features .figure__frame {
  position: relative;
  overflow: hidden;
  background: var(--color-surface-deep);
  border: 1px solid var(--color-line);
}
.page-features .figure__img,
.page-features .figure__frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}
.page-features .figure__cap {
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
}

/* ---------- 章节头 ---------- */
.page-features .sec-head {
  margin-bottom: var(--space-4);
}
.page-features .sec-head .sec-num {
  display: inline-block;
  margin-bottom: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--color-accent);
}
.page-features .sec-head .sec-title {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}
.page-features .sec-head .sec-kicker {
  max-width: var(--measure);
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}
.page-features .sec-head--center {
  text-align: center;
  padding-bottom: var(--space-3);
  border-bottom: 3px double var(--color-line);
}
.page-features .sec-head--center .sec-kicker {
  margin-left: auto;
  margin-right: auto;
}

/* ---------- 对照表区 ---------- */
.page-features .feat-table-sec {
  padding-top: var(--section-y);
  padding-bottom: var(--section-y);
}
.page-features .feat-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  margin: var(--space-4) 0 var(--space-2);
  padding: var(--space-1) 0;
  border-top: 1px dotted var(--color-line);
  border-bottom: 1px dotted var(--color-line);
}
.page-features .feat-filter .filter-btn {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
}
.page-features .feat-filter .filter-count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  letter-spacing: 0.06em;
}

.page-features .feat-table-wrap {
  border: 3px double var(--color-primary);
  overflow-x: auto;
  background: var(--color-surface);
}
.page-features .feat-table {
  width: 100%;
  min-width: 700px;
  border-collapse: collapse;
  font-size: var(--text-sm);
  text-align: left;
}
.page-features .feat-table__caption {
  caption-side: top;
  padding: var(--space-2) var(--space-2) var(--space-1);
  text-align: left;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
  border-bottom: 1px dotted var(--color-line);
}
.page-features .feat-table thead th {
  position: sticky;
  top: 0;
  z-index: 2;
  padding: var(--space-2);
  text-align: center;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--text-base);
  line-height: 1.35;
  color: var(--color-ink);
  background: var(--color-primary-soft);
  border-bottom: 1px solid var(--color-primary);
  border-right: 1px solid var(--color-line);
}
.page-features .feat-table thead th:last-child {
  border-right: 0;
}
.page-features .feat-table thead th.feat-table__corner {
  text-align: left;
  background: var(--color-surface-deep);
}
.page-features .feat-table__colmeta {
  display: block;
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}
.page-features .feat-table tbody tr {
  background: var(--color-surface);
}
.page-features .feat-table tbody tr:nth-child(even) {
  background: var(--color-surface-alt);
}
.page-features .feat-table tbody tr.is-hidden {
  display: none;
}
.page-features .feat-table tbody th.feat-row-head {
  padding: var(--space-2);
  text-align: left;
  vertical-align: top;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--text-base);
  color: var(--color-ink);
  border-right: 1px solid var(--color-line);
  border-bottom: 1px dotted var(--color-line);
  min-width: 132px;
}
.page-features .feat-row-head__name {
  display: block;
}
.page-features .feat-row-head__def {
  display: block;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: var(--text-xs);
  font-weight: 400;
  line-height: 1.5;
  color: var(--color-ink-muted);
  transition: max-height 0.2s ease, opacity 0.2s ease, margin-top 0.2s ease;
}
.page-features .feat-row-head:hover .feat-row-head__def,
.page-features .feat-row-head:focus-within .feat-row-head__def,
.page-features .feat-row-head:focus .feat-row-head__def {
  max-height: 5em;
  margin-top: 4px;
  opacity: 1;
}
.page-features .feat-table tbody td {
  padding: var(--space-2);
  vertical-align: top;
  text-align: center;
  line-height: 1.6;
  color: var(--color-ink-soft);
  border-right: 1px dotted var(--color-line);
  border-bottom: 1px dotted var(--color-line);
}
.page-features .feat-table tbody td:last-child {
  border-right: 0;
}
.page-features .feat-table .mark {
  padding-bottom: 1px;
  color: var(--color-ink);
  font-weight: 600;
  border-bottom: 2px solid var(--color-accent);
}
.page-features .feat-table-note {
  max-width: var(--measure);
  margin-top: var(--space-3);
}

/* ---------- 适用场景 ---------- */
.page-features .feat-scenes {
  padding-top: var(--section-y);
  padding-bottom: var(--section-y);
  background: var(--color-surface-alt);
  border-top: 1px dotted var(--color-line);
  border-bottom: 1px dotted var(--color-line);
}
.page-features .feat-scenes__figure {
  margin: 0 auto var(--space-6);
  max-width: 840px;
}
.page-features .feat-scenes__grid {
  display: grid;
  gap: var(--space-4);
}
.page-features .feat-scene {
  padding: var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-top: 3px solid var(--color-primary);
}
.page-features .feat-scene .badge {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
}
.page-features .feat-scene__title {
  margin: var(--space-2) 0 var(--space-1);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}
.page-features .feat-scene__body {
  margin: 0 0 var(--space-2);
  font-size: var(--text-base);
  color: var(--color-ink-soft);
}
.page-features .feat-scene__foot {
  margin: 0;
  padding-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
  border-top: 1px dotted var(--color-line);
}

/* ---------- 选择建议 ---------- */
.page-features .feat-advice {
  padding-top: var(--section-y);
  padding-bottom: var(--section-y);
}
.page-features .feat-advice__grid {
  display: grid;
  gap: var(--space-6);
}
.page-features .feat-advice__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 3px double var(--color-line);
}
.page-features .feat-advice__item {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: var(--space-2);
  padding: var(--space-3) 0;
  border-bottom: 1px dotted var(--color-line);
}
.page-features .feat-advice__num {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-accent);
}
.page-features .feat-advice__text h3 {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}
.page-features .feat-advice__text p {
  margin: 0;
  color: var(--color-ink-soft);
}
.page-features .feat-advice__aside {
  display: grid;
  gap: var(--space-3);
  align-content: start;
}
.page-features .feat-advice__note p {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

/* ---------- 字段来源 ---------- */
.page-features .feat-source {
  padding-top: var(--section-y);
  padding-bottom: var(--section-y);
  border-top: 3px double var(--color-line);
}
.page-features .feat-source__grid {
  display: grid;
  gap: var(--space-6);
}
.page-features .feat-source__lede {
  max-width: var(--measure);
  margin: 0 0 var(--space-3);
  font-size: var(--text-base);
  color: var(--color-ink-soft);
}
.page-features .feat-source__list {
  margin: 0 0 var(--space-3);
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--color-line);
}
.page-features .feat-source__list li {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  border-bottom: 1px dotted var(--color-line);
}
.page-features .feat-source__key {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
  padding-top: 3px;
}
.page-features .feat-source__val {
  font-size: var(--text-sm);
  color: var(--color-ink);
}
.page-features .feat-source__more {
  max-width: var(--measure);
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}
.page-features .feat-source__more a {
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--color-accent);
}
.page-features .feat-source__more a:hover,
.page-features .feat-source__more a:focus-visible {
  color: var(--color-accent);
}
.page-features .feat-source__figure {
  margin: 0;
}

/* ---------- 焦点可见性 ---------- */
.page-features a:focus-visible,
.page-features button:focus-visible,
.page-features th:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- 平板 ---------- */
@media (min-width: 700px) {
  .page-features .feat-band__nums {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-3);
  }
  .page-features .feat-scenes__grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-features .feat-advice__aside {
    grid-template-columns: 1fr;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-features .feat-band__inner {
    grid-template-columns: 7fr 5fr;
    gap: var(--space-8);
  }
  .page-features .feat-advice__grid {
    grid-template-columns: 7fr 5fr;
  }
  .page-features .feat-source__grid {
    grid-template-columns: 6fr 6fr;
    align-items: start;
  }
  .page-features .feat-source__figure {
    margin-top: var(--space-3);
  }
  .page-features .feat-table tbody th.feat-row-head {
    min-width: 168px;
  }
}

/* ---------- 降低动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-features .feat-row-head__def {
    transition: none;
  }
}
<<<END>>>