.page-features {
  --feat-rule: 3px;
  --feat-band: clamp(var(--space-6), 7vw, var(--section-y));
  --feat-band-sm: clamp(var(--space-4), 4vw, var(--space-6));
}

/* ---------- 首屏 ---------- */
.page-features .features-hero {
  padding-block: var(--space-6) var(--space-6);
}

.page-features .hero-scale {
  height: var(--space-4);
  margin-bottom: var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
  background-image: repeating-linear-gradient(
    90deg,
    var(--color-line) 0 var(--border-thin),
    transparent var(--border-thin) var(--space-2)
  );
  background-repeat: no-repeat;
  background-position: bottom left;
  background-size: 100% 55%;
}

.page-features .section-eyebrow {
  color: var(--color-primary);
  letter-spacing: 0.12em;
  margin-bottom: var(--space-2);
}

.page-features .features-hero .section-lead {
  max-width: 58ch;
  margin-top: var(--space-3);
  font-size: var(--text-lg);
  color: var(--color-ink-soft);
}

/* ---------- 深色数据条 ---------- */
.page-features .band.features-board {
  padding-block: var(--feat-band-sm);
}

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

.page-features .board-cell {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-width: 0;
}

.page-features .board-num {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-contrast-accent);
}

.page-features .board-label {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-contrast-ink);
}

.page-features .board-note {
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent);
}

/* ---------- 首屏图 ---------- */
.page-features .features-hero-visual {
  padding-block: var(--space-6) var(--space-4);
}

/* ---------- 锚点条 ---------- */
.page-features .features-anchors {
  padding-block: var(--space-4);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-features .anchor-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.page-features .anchor-chip {
  display: inline-flex;
  align-items: center;
  padding: 0.35em var(--space-3);
  border-radius: var(--radius-pill);
  background: var(--color-surface-alt);
  color: var(--color-ink);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: background-color 200ms ease-out, color 200ms ease-out;
}

.page-features .anchor-chip:hover {
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

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

/* ---------- 分组通用 ---------- */
.page-features .features-group,
.page-features .features-cross,
.page-features .features-states,
.page-features .features-next {
  padding-block: var(--feat-band);
}

.page-features .group-head {
  max-width: 62ch;
  margin-bottom: var(--space-6);
  padding-left: var(--space-3);
  border-left: var(--feat-rule) solid var(--color-primary);
}

.page-features .group-head .section-title {
  margin: 0;
}

.page-features .group-index {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}

.page-features .group-lead {
  max-width: 62ch;
  margin-top: var(--space-2);
  margin-bottom: 0;
  font-size: var(--text-base);
  color: var(--color-ink-soft);
}

.page-features .group-body {
  align-items: start;
}

.page-features .group-figure {
  margin: 0;
  align-self: center;
}

/* ---------- 指标条目 ---------- */
.page-features .metric-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  min-width: 0;
}

.page-features .metric {
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: var(--shadow-1);
  overflow: hidden;
}

.page-features .metric-head {
  display: grid;
  grid-template-columns: 7ch 1fr auto 2ch;
  align-items: start;
  gap: var(--space-3);
  width: 100%;
  padding: var(--space-3);
  border: 0;
  border-radius: var(--radius-md);
  background: transparent;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: background-color 200ms ease-out;
}

.page-features .metric-head:hover {
  background: var(--color-primary-soft);
}

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

.page-features .metric-num {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-accent);
  word-break: keep-all;
}

.page-features .metric-text {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-width: 0;
}

.page-features .metric-name {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-features .metric-caliber {
  display: block;
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink-soft);
}

.page-features .metric-state {
  display: inline-block;
  padding: 0.22em var(--space-1);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.5;
  white-space: nowrap;
}

.page-features .state--live {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-features .state--archived {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.page-features .state--version {
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

.page-features .metric-cue {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.4;
  color: var(--color-ink-muted);
  text-align: right;
  transition: transform 200ms ease-out, color 200ms ease-out;
}

.page-features .metric-head[aria-expanded="true"] .metric-cue {
  transform: rotate(45deg);
  color: var(--color-primary);
}

/* ---------- 展开面板 ---------- */
.page-features .expand-panel {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height 240ms ease-out, opacity 200ms ease-out;
}

.page-features .expand-panel[data-open] {
  max-height: 60rem;
  opacity: 1;
}

.page-features .expand-inner {
  padding: var(--space-2) var(--space-3) var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-features .data-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-features .data-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-1);
  font-size: var(--text-sm);
}

.page-features .data-key {
  font-family: var(--font-mono);
  color: var(--color-ink-muted);
}

.page-features .data-value {
  color: var(--color-ink);
  line-height: 1.6;
}

.page-features .inline-link {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.page-features .inline-link:hover {
  color: var(--color-accent);
}

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

/* ---------- 同步组侧栏 ---------- */
.page-features .group-aside {
  padding: var(--space-3);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
  border-left: var(--feat-rule) solid var(--color-accent);
}

.page-features .group-aside-title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  color: var(--color-ink);
  margin: 0 0 var(--space-2);
}

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

.page-features .group-aside-meta {
  margin: var(--space-3) 0 0;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

/* ---------- 伤停与裁判对照 ---------- */
.page-features .cross-inner {
  align-items: center;
}

.page-features .cross-lead {
  margin: var(--space-3) 0 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-features .cross-points {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin: var(--space-4) 0 0;
  padding: 0;
  list-style: none;
}

.page-features .cross-points li {
  position: relative;
  padding-left: var(--space-3);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-features .cross-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85em;
  width: var(--space-2);
  border-top: var(--border-thick) solid var(--color-primary);
}

.page-features .features-cross .frame {
  margin: 0;
}

/* ---------- 状态图例 ---------- */
.page-features .state-legend {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin: 0;
}

.page-features .state-item {
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-features .state-item dt {
  margin: 0;
}

.page-features .state-item dd {
  margin: var(--space-2) 0 0;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

.page-features .state-note {
  max-width: 62ch;
  margin: var(--space-6) 0 0;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-muted);
}

/* ---------- 继续查阅 ---------- */
.page-features .next-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-features .next-link {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3);
  border-left: var(--feat-rule) solid var(--color-primary);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: inherit;
  text-decoration: none;
  transition: background-color 200ms ease-out;
}

.page-features .next-link:hover {
  background: var(--color-primary-soft);
}

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

.page-features .next-label {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  color: var(--color-ink);
}

.page-features .next-desc {
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

/* ---------- 图片与锚点通用 ---------- */
.page-features img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-features #cover,
.page-features #sync,
.page-features #cross,
.page-features #archive,
.page-features #states {
  scroll-margin-top: var(--space-6);
}

/* ---------- 窄屏 ---------- */
@media (max-width: 640px) {
  .page-features .metric-head {
    grid-template-columns: 6ch 1fr auto;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-2);
  }

  .page-features .metric-cue {
    display: none;
  }

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

  .page-features .expand-inner {
    padding-inline: var(--space-2);
  }

  .page-features .hero-scale {
    background-image: repeating-linear-gradient(
      90deg,
      var(--color-line) 0 var(--border-thin),
      transparent var(--border-thin) var(--space-1)
    );
  }
}

/* ---------- 中屏 ---------- */
@media (min-width: 640px) {
  .page-features .board-strip {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ---------- 宽屏 ---------- */
@media (min-width: 760px) {
  .page-features .state-legend {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .page-features .data-row {
    grid-template-columns: 12ch 1fr;
    gap: var(--space-2);
  }

  .page-features .data-key {
    text-align: right;
  }
}

@media (min-width: 1000px) {
  .page-features .board-strip {
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
  }

  .page-features .board-cell {
    padding-inline: var(--space-4);
  }

  .page-features .board-cell:first-child {
    padding-left: 0;
  }

  .page-features .board-cell:last-child {
    padding-right: 0;
  }

  .page-features .board-cell + .board-cell {
    border-left: var(--border-thin) solid var(--color-contrast-line);
  }

  .page-features .metric-head {
    padding: var(--space-4);
  }
}

/* ---------- 动效收敛 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-features .expand-panel,
  .page-features .metric-head,
  .page-features .metric-cue,
  .page-features .anchor-chip,
  .page-features .next-link {
    transition: none;
  }
}