.page-features {
  --feat-rail-w: 208px;
  --feat-card-min: 252px;
  --feat-edge: 1px dotted var(--color-line);
}

/* ---------- 首屏 ---------- */
.page-features .feat-hero {
  padding-top: calc(var(--section-y-lg) * 0.5);
}

.page-features .feat-hero__kicker {
  display: block;
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
  text-transform: uppercase;
}

.page-features .feat-hero__title {
  margin: 0;
  max-width: 14em;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: 0.96;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}

.page-features .feat-hero__hl {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--color-primary) 62%, transparent);
  text-decoration-thickness: 0.055em;
  text-underline-offset: 0.1em;
}

.page-features .feat-hero__lower {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  margin-top: var(--space-6);
  padding-top: var(--space-6);
  border-top: var(--feat-edge);
}

.page-features .feat-hero__lead {
  margin: 0;
  max-width: 62ch;
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-features .feat-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: var(--space-4);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-line);
  overflow: hidden;
}

.page-features .feat-metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: var(--space-3);
  background: var(--color-surface-alt);
}

.page-features .feat-metric__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--color-primary);
}

.page-features .feat-metric__unit {
  font-size: var(--text-sm);
  color: var(--color-ink);
}

.page-features .feat-metric__note {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-features .feat-hero__figure {
  margin: 0;
}

/* ---------- 索引条 ---------- */
.page-features .feat-anchor {
  border-top: var(--feat-edge);
  border-bottom: var(--feat-edge);
  background: var(--color-surface-alt);
  padding: var(--space-2) 0;
}

.page-features .feat-anchor__list {
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-features .feat-anchor__list::-webkit-scrollbar {
  display: none;
}

.page-features .feat-anchor__link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px var(--space-2);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
  white-space: nowrap;
  transition: color 140ms ease, border-color 140ms ease, background-color 140ms ease;
}

.page-features .feat-anchor__link:hover,
.page-features .feat-anchor__link:focus-visible,
.page-features .feat-anchor__link[aria-current="true"] {
  color: var(--color-primary);
  border-color: var(--color-line);
  background: var(--color-surface);
}

.page-features .feat-anchor__num {
  color: var(--color-ink-muted);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
}

.page-features .feat-anchor__link[aria-current="true"] .feat-anchor__num {
  color: var(--color-accent);
}

/* ---------- 筛选条 ---------- */
.page-features .feat-filterwrap {
  padding-top: var(--space-4);
  padding-bottom: var(--space-2);
}

.page-features .feat-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
}

.page-features .feat-filter__label {
  margin-right: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

.page-features .feat-filter__btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px var(--space-2);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: color 140ms ease, border-color 140ms ease, background-color 140ms ease;
}

.page-features .feat-filter__btn:hover,
.page-features .feat-filter__btn:focus-visible {
  color: var(--color-ink);
  border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line));
}

.page-features .feat-filter__btn[aria-pressed="true"],
.page-features .feat-filter__btn.is-active {
  color: var(--color-primary-ink);
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.page-features .feat-filter__n {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-features .feat-filter__btn[aria-pressed="true"] .feat-filter__n,
.page-features .feat-filter__btn.is-active .feat-filter__n {
  color: color-mix(in srgb, var(--color-primary-ink) 70%, transparent);
}

.page-features .feat-filter__count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

/* ---------- 分组 ---------- */
.page-features .feat-group {
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
  border-top: var(--feat-edge);
  scroll-margin-top: var(--space-4);
}

.page-features .feat-group__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.page-features .feat-group__rail {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding-left: var(--space-3);
  border-left: 1px dotted var(--color-line);
}

.page-features .feat-group__num {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  color: var(--color-accent);
}

.page-features .feat-group__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-features .feat-group__note {
  margin: 0;
  max-width: 36ch;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-features .feat-group__count {
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-features .feat-group__main {
  min-width: 0;
}

.page-features .feat-group__figure {
  margin: 0 0 var(--space-4);
}

.page-features .feat-group__figure--left {
  margin-right: auto;
  width: 100%;
}

.page-features .feat-group__figure--right {
  margin-left: auto;
  width: 100%;
}

.page-features .feat-group__figure--narrow {
  max-width: 560px;
}

.page-features .feat-group__collapse {
  margin-top: var(--space-3);
}

/* ---------- 媒体框 ---------- */
.page-features .media-frame {
  position: relative;
  margin: 0;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
  overflow: hidden;
}

.page-features .media-frame--wide {
  aspect-ratio: 14 / 9;
}

.page-features .media-frame--square {
  aspect-ratio: 1 / 1;
}

.page-features .media-frame--tall {
  aspect-ratio: 4 / 5;
}

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

.page-features .media-frame__veil {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}

.page-features .media-frame__caption {
  position: absolute;
  right: var(--space-2);
  bottom: var(--space-2);
  padding: 3px var(--space-1);
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--color-contrast-surface) 90%, transparent);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-contrast-ink);
}

/* ---------- 模块卡片 ---------- */
.page-features .module-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
}

.page-features .module-grid.is-empty::after {
  content: "当前筛选条件下没有匹配的模块，切换其他更新节奏试试。";
  grid-column: 1 / -1;
  padding: var(--space-4) 0;
  border-top: var(--feat-edge);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.page-features .module {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
  transition: border-color 160ms ease, background-color 160ms ease;
}

.page-features .module:hover,
.page-features .module:focus-within {
  border-color: color-mix(in srgb, var(--color-primary) 48%, var(--color-line));
  background: color-mix(in srgb, var(--color-primary-soft) 42%, var(--color-surface-alt));
}

.page-features .module__head {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-features .module__num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

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

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

.page-features .module__fields {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin: 0;
  padding: var(--space-2) 0 0;
  border-top: var(--feat-edge);
  list-style: none;
}

.page-features .module__fields li {
  position: relative;
  padding-left: 14px;
  font-size: var(--text-sm);
  line-height: 1.45;
  color: var(--color-ink);
}

.page-features .module__fields li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.58em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  border: 1px solid var(--color-accent);
}

.page-features .module__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-1);
  margin-top: auto;
  padding-top: var(--space-2);
  border-top: var(--feat-edge);
}

.page-features .status-tag {
  display: inline-flex;
  align-items: center;
  padding: 3px var(--space-1);
  border: 1px solid color-mix(in srgb, var(--color-primary) 42%, transparent);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-primary);
  white-space: nowrap;
}

.page-features .module__sync {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  transition: color 160ms ease;
}

.page-features .module:hover .module__sync,
.page-features .module:focus-within .module__sync {
  color: var(--color-accent);
}

/* ---------- 折叠面板 ---------- */
.page-features .collapse {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-deep);
  overflow: hidden;
}

.page-features .collapse__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink);
  cursor: pointer;
  list-style: none;
}

.page-features .collapse__summary::-webkit-details-marker {
  display: none;
}

.page-features .collapse__summary::after {
  content: "+";
  font-family: var(--font-mono);
  color: var(--color-primary);
}

.page-features .collapse[open] .collapse__summary::after {
  content: "–";
}

.page-features .collapse__count {
  margin-left: auto;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-features .collapse__body {
  padding: 0 var(--space-3) var(--space-3);
  border-top: var(--feat-edge);
}

.page-features .collapse__body p {
  margin: var(--space-2) 0 0;
  max-width: 73ch;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 组合建议 ---------- */
.page-features .feat-guide .section__head {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin-bottom: var(--space-4);
}

.page-features .guide-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-line);
  overflow: hidden;
}

.page-features .guide-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3);
  background: var(--color-surface-alt);
}

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

.page-features .guide-item__num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-accent);
}

.page-features .guide-item__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-features .guide-item__text {
  margin: 0;
  max-width: 66ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-features .guide-item__modules {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.page-features .guide-item__link {
  align-self: flex-start;
  margin-top: var(--space-1);
}

.page-features .feat-guide__callout {
  margin-top: var(--space-4);
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 720px) {
  .page-features .feat-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-features .feat-metric__num {
    font-size: var(--text-4xl);
  }

  .page-features .module-grid {
    grid-template-columns: repeat(auto-fill, minmax(var(--feat-card-min), 1fr));
  }

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

  .page-features .guide-item:last-child:nth-child(odd) {
    grid-column: 1 / -1;
  }
}

@media (min-width: 960px) {
  .page-features .feat-hero__lower {
    grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.92fr);
    align-items: start;
    gap: var(--space-8);
  }

  .page-features .feat-hero__figure {
    margin-top: calc(var(--space-3) * -1);
  }

  .page-features .feat-group__grid {
    grid-template-columns: var(--feat-rail-w) minmax(0, 1fr);
    gap: var(--space-6);
  }

  .page-features .feat-group__figure--left,
  .page-features .feat-group__figure--right {
    width: 78%;
  }

  .page-features .feat-group__figure--narrow {
    width: 62%;
  }
}

@media (min-width: 1200px) {
  .page-features .feat-group__figure--left,
  .page-features .feat-group__figure--right {
    width: 66%;
  }

  .page-features .feat-group__figure--narrow {
    width: 54%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-features .module,
  .page-features .module__sync,
  .page-features .feat-anchor__link,
  .page-features .feat-filter__btn {
    transition: none;
  }
}