.page-features {
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
}

.page-features .breadcrumb {
  padding-top: var(--space-4);
}

/* ---------- 首屏 ---------- */
.page-features .feat-hero {
  padding: var(--space-6) 0 var(--space-8);
}

.page-features .feat-hero .eyebrow {
  margin: 0 0 var(--space-2);
}

.page-features .display-title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 0.94;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-features .feat-hero__lede {
  max-width: var(--measure);
  margin: 0 0 var(--space-6);
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-features .hero-stage {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gutter);
}

.page-features .hero-blocks {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
}

.page-features .hero-block {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 168px;
  padding: var(--space-3) var(--space-2) var(--space-6);
  text-decoration: none;
  border-radius: 0;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), 0 100%);
  transition: transform 160ms ease;
}

.page-features .hero-block--primary {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-features .hero-block--accent {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.page-features .hero-block--dark {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-features .hero-block:hover {
  transform: translateY(-4px);
}

.page-features .hero-block__idx {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  opacity: 0.78;
}

.page-features .hero-block__name {
  display: block;
  margin-top: auto;
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: var(--tracking-heading);
}

.page-features .hero-block__num {
  display: block;
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  opacity: 0.86;
}

.page-features .hero-figures {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
  padding: 2px;
  background: var(--color-contrast-surface);
}

.page-features .hero-figure {
  padding: var(--space-3) var(--space-2);
  background: var(--color-contrast-surface);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-features .hero-figure__num {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 0.92;
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}

.page-features .hero-figure__label {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
  opacity: 0.72;
}

.page-features .feat-hero__media {
  margin: var(--space-6) 0 0;
  height: clamp(180px, 34vw, 420px);
  overflow: hidden;
}

.page-features .feat-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 本页目录 ---------- */
.page-features .feat-index {
  background: var(--color-surface-alt);
  padding: var(--space-3) 0;
}

.page-features .feat-index__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-4);
}

.page-features .feat-index__label {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

.page-features .feat-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-features .feat-index__list a {
  display: inline-block;
  padding: var(--space-1) var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink);
  text-decoration: none;
  border-radius: var(--radius-sm);
  border-bottom: var(--border-thin) solid transparent;
  transition: color 140ms ease, border-color 140ms ease;
}

.page-features .feat-index__list a:hover,
.page-features .feat-index__list a:focus-visible,
.page-features .feat-index__list a[aria-current="true"] {
  color: var(--color-focus);
  border-bottom-color: var(--color-focus);
}

/* ---------- 能力域通用 ---------- */
.page-features .domain {
  padding-top: var(--section-y);
}

.page-features .domain__ruler {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-1) var(--space-3);
  padding: var(--space-2) var(--space-6) var(--space-2) var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  clip-path: polygon(0 0, 100% 0, calc(100% - 20px) 100%, 0 100%);
}

.page-features .domain--archive .domain__ruler {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-features .domain--index .domain__ruler {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.page-features .domain--compare .domain__ruler {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-features .domain__intro {
  margin-top: var(--space-6);
  align-items: start;
}

.page-features .domain__intro h2 {
  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 .domain__intro .prose {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-features .domain__intro figure {
  margin: 0;
}

.page-features .domain__next {
  margin: var(--space-4) 0 0;
  max-width: var(--measure);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-features .domain__next a {
  color: var(--color-focus);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-highlight);
}

.page-features .domain__next a:hover {
  border-bottom-color: var(--color-focus);
}

/* ---------- 索引域维度列表 ---------- */
.page-features .dimension-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-features .dimension-list li {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--color-ink);
}

.page-features .dimension-list .mono {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-accent);
  letter-spacing: 0.06em;
}

/* ---------- 能力条目 ---------- */
.page-features .cap-list {
  display: grid;
  gap: var(--space-3);
  margin: var(--space-6) 0 0;
  padding: 0;
  list-style: none;
}

.page-features .cap-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-3) var(--space-3) var(--space-4);
  background: var(--color-surface);
  border-left: 4px solid var(--color-primary);
  box-shadow: 4px 4px 0 var(--color-surface-deep);
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.page-features .domain--index .cap-item {
  border-left-color: var(--color-accent);
}

.page-features .domain--compare .cap-item {
  border-left-color: var(--color-contrast-surface);
}

.page-features .cap-item:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--color-surface-deep);
}

.page-features .cap-item__side {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-2);
}

.page-features .cap-item__no {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: 0.03em;
  color: var(--color-primary);
}

.page-features .domain--index .cap-item__no {
  color: var(--color-accent);
}

.page-features .domain--compare .cap-item__no {
  color: var(--color-contrast-surface);
}

.page-features .cap-item__no::before {
  content: "";
  display: inline-block;
  width: calc(var(--space-1) * 0.75);
  height: calc(var(--space-1) * 0.75);
  margin-right: var(--space-1);
  border-radius: var(--radius-pill);
  background: currentColor;
  vertical-align: 0.22em;
}

.page-features .cap-item__scope {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.4;
  color: var(--color-ink-muted);
}

.page-features .cap-item__body h3 {
  margin: 0 0 var(--space-2);
  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);
  color: var(--color-ink);
}

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

.page-features .cap-item__points {
  display: grid;
  gap: var(--space-1);
  margin: 0 0 var(--space-3);
  padding: 0;
  list-style: none;
}

.page-features .cap-item__points li {
  position: relative;
  padding-left: var(--space-3);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-ink);
}

.page-features .cap-item__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: var(--space-2);
  height: var(--border-thin);
  background: var(--color-primary);
}

.page-features .domain--index .cap-item__points li::before {
  background: var(--color-accent);
}

.page-features .domain--compare .cap-item__points li::before {
  background: var(--color-contrast-surface);
}

.page-features .cap-item__output {
  margin: 0;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--color-ink);
  background: var(--color-surface-alt);
  border-radius: var(--radius-sm);
  transition: background 160ms ease;
}

.page-features .cap-item:hover .cap-item__output {
  background: var(--color-highlight);
}

/* ---------- 索引域通栏图 ---------- */
.page-features .index-map {
  margin: var(--space-6) 0 0;
}

/* ---------- 六类对照棋盘格 ---------- */
.page-features .checker-map {
  margin-top: var(--space-4);
}

.page-features .checker-map__title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.page-features .checker-map__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--color-line);
}

.page-features .checker-map__cell {
  padding: var(--space-2);
  font-size: var(--text-sm);
  line-height: 1.45;
  color: var(--color-ink);
  background: var(--color-surface-alt);
  border-top: 4px solid var(--color-primary);
}

.page-features .checker-map__cell:nth-child(2n) {
  background: var(--color-surface-deep);
  border-top-color: var(--color-accent);
}

.page-features .checker-map__cell .mono {
  display: block;
  margin-bottom: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

/* ---------- 边界与产出物 ---------- */
.page-features .feat-limits {
  padding: var(--section-y-lg) 0 var(--space-8);
}

.page-features .feat-limits h2 {
  margin: 0 0 var(--space-4);
  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);
}

.page-features .limit-list {
  display: grid;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-features .limit-list li {
  position: relative;
  padding-left: var(--space-4);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-features .limit-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  font-family: var(--font-mono);
  color: var(--color-primary);
}

.page-features .limits-panel {
  padding: var(--space-4);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-features .limits-panel h2 {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}

.page-features .limits-panel__list {
  display: grid;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-features .limits-panel__list li {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-1) 0;
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--color-contrast-ink);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.page-features .limits-panel__list li:last-child {
  border-bottom: 0;
}

.page-features .limits-panel__list .mono {
  flex: none;
  min-width: var(--space-6);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-contrast-accent);
  letter-spacing: 0.05em;
}

.page-features .feat-limits__next {
  margin: var(--space-6) 0 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-features .feat-limits__next a {
  color: var(--color-focus);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-highlight);
}

.page-features .feat-limits__next a:hover {
  border-bottom-color: var(--color-focus);
}

/* ---------- 窄屏适配 ---------- */
@media (max-width: 719px) {
  .page-features .hero-blocks {
    grid-template-columns: 1fr;
  }

  .page-features .hero-block {
    min-height: 120px;
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), 0 100%);
  }

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

  .page-features .domain__ruler {
    clip-path: none;
    padding-right: var(--space-3);
  }

  .page-features .feat-index__list {
    gap: var(--space-1);
  }

  .page-features .limits-panel__list .mono {
    min-width: var(--space-4);
  }
}

@media (min-width: 720px) {
  .page-features .checker-map__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 900px) {
  .page-features .hero-stage {
    grid-template-columns: 7fr 5fr;
    align-items: stretch;
  }

  .page-features .cap-item {
    grid-template-columns: 200px 1fr;
    gap: var(--space-4);
  }

  .page-features .cap-item__side {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-1);
  }

  .page-features .domain__intro {
    gap: var(--space-6);
  }
}

@media (min-width: 1100px) {
  .page-features .cap-item {
    grid-template-columns: 236px 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-features .hero-block,
  .page-features .cap-item,
  .page-features .cap-item__output {
    transition: none;
  }

  .page-features .hero-block:hover,
  .page-features .cap-item:hover {
    transform: none;
  }
}