.page-features {
  --feat-panel: color-mix(in srgb, var(--color-primary-soft) 45%, var(--color-surface));
  --feat-hair: var(--color-line);
  --feat-accent-bar: 6px;
}

.page-features img {
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏 ---------- */
.page-features .features-hero {
  padding-top: var(--section-y-lg);
  padding-bottom: var(--section-y);
  border-bottom: var(--border-thick) solid var(--color-ink);
  background:
    linear-gradient(
      180deg,
      color-mix(in srgb, var(--color-primary-soft) 70%, var(--color-surface)) 0%,
      var(--color-surface) 78%
    );
}

.page-features .features-hero-copy {
  max-width: var(--measure);
  margin-top: var(--space-3);
}

.page-features .features-hero h1 {
  margin: 0 0 var(--space-3);
  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-ink);
}

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

.page-features .features-hero-figure {
  margin: var(--space-4) 0 0;
  max-width: 100%;
}

.page-features .features-hero-figure .media {
  border: var(--border-thin) solid var(--color-ink);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-features .features-hero-figure .media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-features .features-hero-figure .media-caption {
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  max-width: var(--measure);
}

/* ---------- 区块标题 ---------- */
.page-features .section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-1) var(--space-2);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thick) solid var(--color-ink);
  margin-bottom: var(--space-4);
}

.page-features .section-head h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

/* ---------- 总览 ---------- */
.page-features .overview-grid {
  margin-bottom: var(--space-4);
}

.page-features .overview-note {
  margin: 0;
}

.page-features .overview-note-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-base);
  color: var(--color-ink);
  margin: 0 0 var(--space-1);
}

.page-features .overview-note p:last-child {
  margin-bottom: 0;
}

.page-features .overview-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
  margin: 0 0 var(--space-4);
  padding: var(--space-3) 0 0;
  list-style: none;
  border-top: var(--border-thin) solid var(--feat-hair);
}

.page-features .overview-stats .stat {
  padding-left: var(--space-2);
  border-left: var(--feat-accent-bar) solid var(--color-primary);
}

.page-features .overview-stats .stat-value {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-xl);
  font-weight: 800;
  line-height: 1.1;
  color: var(--color-ink);
}

.page-features .overview-stats .stat-label {
  display: block;
  margin-top: 4px;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

/* ---------- 分类导航（滚动高亮） ---------- */
.page-features .category-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  padding: var(--space-2) 0;
  border-top: var(--border-thin) solid var(--feat-hair);
  border-bottom: var(--border-thin) solid var(--feat-hair);
}

.page-features .category-nav a {
  display: inline-block;
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink);
  text-decoration: none;
  border: var(--border-thin) solid var(--feat-hair);
  border-radius: var(--radius-sm);
  transition: background-color 140ms ease, border-color 140ms ease, color 140ms ease;
}

.page-features .category-nav a:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
}

.page-features .category-nav a[aria-current] {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-weight: 700;
}

.page-features .category-nav a:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- 指标网格 ---------- */
.page-features .metrics-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-2);
}

.page-features .metric {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
  padding: var(--space-3);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--feat-hair);
  border-left: var(--feat-accent-bar) solid var(--color-primary);
  border-radius: var(--radius-sm);
  transition: background-color 140ms ease, border-color 140ms ease;
}

.page-features .metric:hover {
  background: var(--feat-panel);
  border-color: var(--color-primary);
}

.page-features .metric:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
}

.page-features .metric-hero {
  border-color: var(--color-ink);
  border-left-color: var(--color-primary);
}

.page-features .metric-cat {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-features .metric-name {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 700;
  line-height: 1.35;
  color: var(--color-ink);
}

.page-features .metric-value {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
  color: var(--color-primary);
}

.page-features .metric-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-2xl);
  font-weight: 800;
  line-height: 1.05;
}

.page-features .metric-hero .metric-num {
  font-size: var(--text-3xl);
}

.page-features .metric-unit {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  font-weight: 700;
}

.page-features .metric-scope {
  margin: 0;
  padding-top: 6px;
  border-top: 2px dotted var(--feat-hair);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink-soft);
}

/* ---------- 指标配图 ---------- */
.page-features .metric-figure {
  margin: 0;
  min-width: 0;
  display: flex;
  flex-direction: column;
  border: var(--border-thin) solid var(--feat-hair);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--color-surface-alt);
}

.page-features .metric-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-features .metric-figure .media-caption {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  line-height: 1.55;
  color: var(--color-ink-soft);
  border-top: var(--border-thin) solid var(--feat-hair);
  background: var(--color-surface);
}

.page-features .wide-figure {
  margin-top: var(--space-3);
  max-width: 520px;
}

/* ---------- 区块尾注 ---------- */
.page-features .section-tail {
  margin-top: var(--space-3);
}

.page-features .section-tail p {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink-soft);
}

/* ---------- 口径与更新 ---------- */
.page-features .scope-grid {
  align-items: start;
}

.page-features .scope-grid .prose h3 {
  margin-top: 0;
}

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

.page-features .timeline-item {
  position: relative;
  padding-left: var(--space-4);
  padding-bottom: var(--space-3);
  border-left: var(--border-thin) solid var(--feat-hair);
}

.page-features .timeline-item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-features .timeline-mark {
  position: absolute;
  left: -8px;
  top: 6px;
  width: 14px;
  height: 14px;
  background: var(--color-primary);
  border-radius: 2px;
}

.page-features .timeline-step {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-primary);
}

.page-features .timeline-item h3 {
  margin: 0 0 4px;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-ink);
}

.page-features .timeline-item p:last-child {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink-soft);
}

.page-features .scope-links {
  margin-top: var(--space-4);
  padding: var(--space-3);
  border: var(--border-thin) solid var(--feat-hair);
  border-left: var(--feat-accent-bar) solid var(--color-primary);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
}

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

.page-features .scope-links a {
  color: var(--color-primary);
  font-weight: 700;
  text-underline-offset: 3px;
}

.page-features .scope-links a:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-features .overview-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-features .features-hero h1 {
    font-size: var(--text-4xl);
  }

  .page-features .metrics-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-3);
  }

  .page-features .metric-hero {
    grid-column: 1 / -1;
  }

  .page-features .overview-stats {
    gap: var(--space-3);
  }
}

@media (max-width: 639px) {
  .page-features .features-hero {
    padding-top: calc(var(--section-y) + var(--space-4));
  }

  .page-features .metric-num {
    font-size: var(--text-xl);
  }

  .page-features .metric-hero .metric-num {
    font-size: var(--text-2xl);
  }

  .page-features .wide-figure {
    max-width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-features .metric,
  .page-features .category-nav a {
    transition: none;
  }
}