.page-features {
  --feat-rule-w: var(--border-thick);
}

/* ---------- 首屏 ---------- */
.page-features .feat-hero {
  background: var(--color-surface);
  padding-block: var(--space-3) var(--space-8);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-features .feat-hero__head {
  padding-block: var(--space-4) var(--space-6);
  border-top: var(--feat-rule-w) solid var(--color-ink);
}

.page-features .feat-hero__title {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: 0.01em;
  color: var(--color-ink);
  margin: var(--space-2) 0 0;
  max-width: 17ch;
}

.page-features .feat-hero__low {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  align-items: start;
}

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

.page-features .feat-hero__lead p {
  margin: 0 0 var(--space-3);
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.page-features .feat-hero__lead a {
  color: var(--color-ink);
  text-decoration: underline;
  text-decoration-thickness: var(--border-thin);
  text-underline-offset: 3px;
}

.page-features .feat-hero__media {
  position: relative;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--color-surface-alt);
  border: var(--border-thick) solid var(--color-primary);
}

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

.page-features .feat-hero__figures {
  position: relative;
  padding-block-start: var(--space-2);
}

.page-features .feat-hero__semi {
  position: absolute;
  right: 0;
  top: 0;
  width: 100%;
  max-width: 340px;
  height: auto;
  pointer-events: none;
  z-index: 0;
}

.page-features .feat-hero__semi .semi-arc {
  fill: none;
  stroke: var(--color-primary);
  stroke-width: 3;
}

.page-features .feat-hero__semi .semi-tick {
  stroke: var(--color-line);
  stroke-width: 3;
}

.page-features .feat-hero__stats {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
  padding-block-start: var(--space-6);
}

.page-features .feat-stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  border-inline-start: var(--border-thick) solid var(--color-primary);
  padding-inline-start: var(--space-3);
}

.page-features .feat-stat:nth-child(2) {
  border-inline-start-color: var(--color-contrast-surface);
}

.page-features .feat-stat:nth-child(3) {
  border-inline-start-color: var(--color-accent);
}

.page-features .feat-stat:nth-child(4) {
  border-inline-start-color: var(--color-line);
}

.page-features .feat-stat__num {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-ink);
  letter-spacing: -0.01em;
}

.page-features .feat-stat__label {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  letter-spacing: 0.06em;
}

/* ---------- 通用标题 ---------- */
.page-features .feat-h2 {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: 0.05em;
  color: var(--color-ink);
  margin: 0 0 var(--space-3);
  text-transform: none;
}

.page-features .feat-h2--dark {
  color: var(--color-contrast-ink);
}

.page-features .feat-h3 {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: 0.04em;
  color: var(--color-ink);
  margin: 0 0 var(--space-2);
}

.page-features .feat-h3--dark {
  color: var(--color-contrast-ink);
}

.page-features .feat-intro {
  max-width: var(--measure);
  color: var(--color-ink-soft);
  margin: 0 0 var(--space-6);
}

.page-features .mx-footnote {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  max-width: var(--measure);
  margin: var(--space-4) 0 0;
}

/* ---------- 三种取法 ---------- */
.page-features .scheme-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.page-features .scheme-def {
  border-top: var(--border-thick) solid var(--color-line);
  padding-block-start: var(--space-3);
  margin: 0;
}

.page-features .scheme-def--a {
  border-top-color: var(--color-primary);
}

.page-features .scheme-def--b {
  border-top-color: var(--color-accent);
}

.page-features .scheme-def--c {
  border-top-color: var(--color-contrast-surface);
}

.page-features .scheme-def p {
  margin: 0;
  color: var(--color-ink-soft);
}

.page-features .scheme-def .label {
  margin-bottom: var(--space-2);
}

/* ---------- 对照表 ---------- */
.page-features .mx-wrap {
  border-top: var(--border-thick) solid var(--color-ink);
}

.page-features .mx-caption {
  caption-side: top;
  text-align: left;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  padding-block-end: var(--space-2);
}

.page-features .compare-table {
  width: 100%;
  min-width: 920px;
  border-collapse: collapse;
  font-size: var(--text-sm);
  table-layout: fixed;
}

.page-features .compare-table col,
.page-features .compare-table th,
.page-features .compare-table td {
  vertical-align: top;
}

.page-features .compare-table thead th {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  text-align: left;
  padding: var(--space-2);
  border-right: var(--border-thin) solid var(--color-surface);
}

.page-features .compare-table thead th:last-child {
  border-right: 0;
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.page-features .compare-table thead th:first-child {
  position: sticky;
  left: 0;
  z-index: 2;
  min-width: 220px;
}

.page-features .compare-table tbody th[scope="colgroup"] {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.1em;
  text-align: left;
  padding: var(--space-2) var(--space-3);
  border-top: var(--border-thick) solid transparent;
}

.page-features .mx-group--primary th {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-features .mx-group--dark th {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-accent);
}

.page-features .mx-group--accent th {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.page-features .compare-table tbody tr td,
.page-features .compare-table tbody tr th {
  padding: var(--space-3) var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
  background: var(--color-surface);
}

.page-features .compare-table tbody tr:nth-child(even) td,
.page-features .compare-table tbody tr:nth-child(even) th {
  background: var(--color-surface-alt);
}

.page-features .compare-table tbody th.mx-topic {
  position: sticky;
  left: 0;
  z-index: 1;
  background: var(--color-surface-alt);
  border-inline-start: var(--border-thick) solid var(--color-line);
  padding-inline-start: var(--space-2);
  font-weight: var(--weight-body);
}

.page-features .compare-table tbody tr:nth-child(odd) th.mx-topic {
  border-inline-start-color: var(--color-primary);
  padding-inline-start: var(--space-4);
}

.page-features .mx-topic__name {
  display: block;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  letter-spacing: 0.02em;
  color: var(--color-ink);
  margin-bottom: var(--space-1);
}

.page-features .mx-topic__fields {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  line-height: 1.5;
}

.page-features .mx-cell {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.page-features .mx-blocks {
  display: flex;
  gap: 4px;
}

.page-features .mx-blocks i {
  width: 10px;
  height: 10px;
  display: block;
  background: transparent;
  border: var(--border-thin) solid var(--color-line);
}

.page-features .mx-cell[data-level="full"] .mx-blocks i {
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.page-features .mx-cell[data-level="partial"] .mx-blocks i:nth-child(-n + 2) {
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.page-features .mx-cell[data-level="low"] .mx-blocks i:nth-child(1) {
  background: var(--color-primary);
  border-color: var(--color-primary);
}

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

.page-features .compare-table td.mx-limit {
  border-inline-start: var(--border-thin) solid var(--color-accent);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  line-height: 1.5;
}

/* ---------- 裁判字段口径 ---------- */
.page-features .field-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  align-items: start;
}

.page-features .field-grid__media .media__cap {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  margin-top: var(--space-2);
}

.page-features .field-list {
  margin: var(--space-4) 0 0;
  display: grid;
  gap: var(--space-4);
}

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

.page-features .field-item dt {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: 0.04em;
  color: var(--color-ink);
  margin-bottom: var(--space-2);
}

.page-features .field-item dd {
  margin: 0;
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.page-features .field-grid__body .strip-note {
  margin-top: var(--space-4);
}

/* ---------- 方案选择 ---------- */
.page-features .chipbar {
  margin-bottom: var(--space-6);
}

.page-features .scheme-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.page-features .scheme-item {
  border-inline-start: var(--border-thick) solid var(--color-line);
  padding: var(--space-3) 0 var(--space-3) var(--space-3);
  background: var(--color-surface-alt);
}

.page-features .scheme-item[data-tags*="quick"] {
  border-inline-start-color: var(--color-primary);
}

.page-features .scheme-item[data-tags*="combo"] {
  border-inline-start-color: var(--color-accent);
}

.page-features .scheme-item__q {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  letter-spacing: 0.02em;
  color: var(--color-ink);
  margin: 0 0 var(--space-2);
}

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

.page-features .scheme-item__a strong {
  color: var(--color-ink);
  font-weight: var(--weight-heading);
}

/* ---------- 更新与校验 ---------- */
.page-features .cadence-head {
  max-width: var(--measure);
  margin-bottom: var(--space-6);
}

.page-features .cadence-lead {
  color: var(--color-contrast-ink);
  margin: 0;
}

.page-features .trace {
  margin-bottom: var(--space-6);
}

.page-features .cadence-body p {
  color: var(--color-contrast-ink);
  margin: 0;
}

.page-features .cadence-media {
  margin-bottom: var(--space-4);
}

.page-features .cadence-note {
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
  opacity: 0.78;
  max-width: var(--measure);
  margin: 0;
  border-top: var(--border-thin) solid var(--color-contrast-line);
  padding-top: var(--space-3);
}

/* ---------- 能力边界 ---------- */
.page-features .limits-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  align-items: start;
}

.page-features .boundary-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
}

.page-features .boundary-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
  padding-bottom: var(--space-3);
}

.page-features .boundary-item__idx {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-accent);
  line-height: 1;
}

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

.page-features .limits-body .strip-note {
  margin-top: var(--space-4);
}

/* ---------- 响应式 ---------- */
@media (min-width: 641px) {
  .page-features .scheme-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 981px) {
  .page-features .feat-hero__low {
    grid-template-columns: minmax(0, 5fr) minmax(0, 3fr) minmax(0, 3fr);
    gap: var(--space-4);
  }

  .page-features .scheme-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-features .feat-hero__stats {
    grid-template-columns: 1fr;
  }

  .page-features .mx-wrap {
    margin-inline: calc(var(--gutter) * -1);
  }

  .page-features .field-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: var(--space-6);
  }

  .page-features .limits-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: var(--space-6);
  }

  .page-features .cadence-head {
    display: grid;
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: var(--space-4);
    max-width: none;
    align-items: end;
  }

  .page-features .cadence-head .feat-h2 {
    margin-bottom: 0;
  }
}