.page-features {
  --features-chip-pad: var(--space-3);
  --features-stripe: calc(var(--border-thin) * 3);
}

.page-features .features-hero-intro {
  max-width: 66ch;
}

.page-features .features-hero-intro .display-title {
  margin: var(--space-2) 0 var(--space-3);
  font-size: var(--text-display);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
}

.page-features .features-hero-intro .lead {
  margin: 0;
}

.page-features .features-hero-body {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.page-features .season-rail-label,
.page-features .rule-index-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

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

.page-features .season-chip {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-rows: auto auto;
  column-gap: var(--space-3);
  align-items: baseline;
  padding: var(--features-chip-pad);
  border-radius: var(--radius-lg);
  border-left: var(--features-stripe) solid var(--color-primary);
  background: var(--color-primary-soft);
  box-shadow: var(--shadow-1);
}

.page-features .season-chip:nth-child(2) {
  border-left-color: var(--color-primary);
  background: var(--color-surface-alt);
}

.page-features .season-chip:nth-child(3) {
  border-left-color: var(--color-accent);
  background: var(--color-highlight);
}

.page-features .season-chip-num {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  line-height: 1;
  color: var(--color-primary);
}

.page-features .season-chip:nth-child(3) .season-chip-num {
  color: var(--color-accent);
}

.page-features .season-chip-name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.25;
  color: var(--color-ink);
}

.page-features .season-chip-meta {
  grid-column: 2;
  font-size: var(--text-sm);
  line-height: 1.55;
  color: var(--color-ink-soft);
}

.page-features .features-hero-media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-1);
}

.page-features .rule-index {
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--color-surface-alt);
}

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

@media (min-width: 640px) {
  .page-features .rule-index-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-features .rule-index-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-2);
  align-items: baseline;
  padding: var(--space-1) 0;
  border-bottom: var(--border-thin) dashed var(--color-line);
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--color-ink);
}

.page-features .rule-index-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-primary);
}

.page-features .features-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
  margin: var(--space-6) 0 0;
  padding: 0;
  list-style: none;
}

.page-features .features-stat {
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border-left: var(--features-stripe) solid var(--color-primary);
  background: var(--color-surface-alt);
}

.page-features .features-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-primary);
}

.page-features .features-stat-label {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  line-height: 1.55;
  color: var(--color-ink-soft);
}

@media (min-width: 1000px) {
  .page-features .features-hero-body {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: var(--space-6);
  }

  .page-features .season-rail {
    grid-column: 1;
    grid-row: 1;
  }

  .page-features .features-hero-media {
    grid-column: 1;
    grid-row: 2;
  }

  .page-features .rule-index {
    grid-column: 2;
    grid-row: 1 / span 2;
  }
}

@media (min-width: 900px) {
  .page-features .features-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 总览表 ---------- */

.page-features .features-overview .section-head,
.page-features .features-group-head {
  max-width: 64ch;
}

.page-features .features-overview .section-head h2,
.page-features .features-group-head h2 {
  margin: var(--space-2) 0 var(--space-3);
}

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

.page-features .features-filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-top: var(--space-4);
  padding: var(--space-2);
  border-radius: var(--radius-lg);
  background: var(--color-surface-alt);
}

.page-features .features-filter .filter-btn {
  padding: var(--space-1) var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.6;
  cursor: pointer;
  transition: background 160ms ease, color 160ms ease, border-color 160ms ease;
}

.page-features .features-filter .filter-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-ink);
}

.page-features .features-filter .filter-btn.is-active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-ink);
}

.page-features .features-filter .filter-btn:focus-visible {
  outline: var(--features-stripe) solid var(--color-focus);
  outline-offset: 2px;
}

.page-features .rules-table-wrap {
  margin-top: var(--space-4);
  border-radius: var(--radius-lg);
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface);
  overflow-x: auto;
  box-shadow: var(--shadow-1);
}

.page-features .rules-table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.page-features .rules-table thead th {
  padding: var(--space-2) var(--space-3);
  background: var(--color-primary-soft);
  border-bottom: var(--border-thin) solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-body);
  letter-spacing: 0.08em;
  text-align: left;
  white-space: nowrap;
  color: var(--color-ink);
}

.page-features .rules-table tbody th {
  padding: var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  line-height: 1.4;
  text-align: left;
  vertical-align: top;
  color: var(--color-ink);
}

.page-features .rules-table tbody td {
  padding: var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.6;
  vertical-align: top;
  color: var(--color-ink-soft);
}

.page-features .rules-table tbody tr:last-child th,
.page-features .rules-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-features .rules-table tbody td.is-changed {
  background: color-mix(in srgb, var(--color-highlight) 55%, var(--color-surface));
  box-shadow: inset var(--features-stripe) 0 0 var(--color-accent);
  color: var(--color-ink);
  font-weight: 600;
}

.page-features .rules-table tbody tr:hover th {
  background: var(--color-surface-alt);
}

.page-features .rules-table .tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.5;
}

/* ---------- 分组区块 ---------- */

.page-features .features-group {
  position: relative;
}

.page-features .features-group-head h2 {
  font-size: var(--text-2xl);
  letter-spacing: var(--tracking-heading);
}

.page-features .group-one-grid {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.page-features .group-one-figure,
.page-features .group-two-media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-1);
}

.page-features .group-two-media {
  margin-top: var(--space-4);
}

.page-features .group-three-media {
  width: 100%;
  margin: var(--space-4) 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-1);
}

@media (min-width: 900px) {
  .page-features .group-one-grid {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    gap: var(--space-6);
    align-items: start;
  }

  .page-features .group-three-media {
    width: 72%;
    margin-left: auto;
  }
}

.page-features .rules-notes {
  display: grid;
  gap: var(--space-2);
  margin: var(--space-3) 0 0;
  padding: 0;
  list-style: none;
}

.page-features .rules-note {
  padding: var(--space-3) var(--space-3) var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  border-left: var(--features-stripe) solid var(--color-primary);
  background: var(--color-surface-alt);
}

.page-features .rules-note-title {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  line-height: 1.4;
  color: var(--color-ink);
}

.page-features .rules-note-text {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.78;
  color: var(--color-ink-soft);
}

@media (min-width: 900px) {
  .page-features .rules-notes--trio {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

.page-features .rules-svg {
  display: block;
  width: 100%;
  height: auto;
  margin: var(--space-3) 0 0;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
}

.page-features .rules-svg--wide {
  margin-top: var(--space-4);
}

.page-features .rules-svg .svg-label {
  font-family: var(--font-mono);
  font-size: 11px;
  fill: var(--color-ink-muted);
}

.page-features .group-cross-note {
  margin: var(--space-4) 0 0;
  padding-left: var(--space-3);
  border-left: var(--features-stripe) solid var(--color-accent);
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.page-features .group-cross-note a,
.page-features .guide-list a,
.page-features .guide-footer a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 深色差异总结 ---------- */

.page-features .features-diff h2 {
  margin: var(--space-2) 0 var(--space-4);
  max-width: 30ch;
  color: var(--color-contrast-ink);
}

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

.page-features .diff-item {
  padding: var(--space-3) 0 var(--space-3) var(--space-4);
  border-left: var(--features-stripe) solid var(--color-contrast-accent);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-features .diff-item-title {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.35;
  color: var(--color-contrast-ink);
}

.page-features .diff-item-text {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.78;
  color: var(--color-contrast-ink);
  opacity: 0.86;
}

@media (min-width: 900px) {
  .page-features .diff-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-6);
  }
}

/* ---------- 读表与建议 ---------- */

.page-features .guide-grid {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

@media (min-width: 900px) {
  .page-features .guide-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-6);
  }
}

.page-features .guide-block {
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--color-surface-alt);
}

.page-features .guide-block--warm {
  background: var(--color-primary-soft);
}

.page-features .guide-block h3 {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.3;
  color: var(--color-ink);
}

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

.page-features .guide-list li {
  padding-left: var(--space-3);
  border-left: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
  line-height: 1.78;
  color: var(--color-ink-soft);
}

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

.page-features .guide-footer {
  display: grid;
  gap: var(--space-2);
  margin-top: var(--space-4);
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  border-left: var(--features-stripe) solid var(--color-primary);
  background: var(--color-surface-deep);
}

.page-features .guide-footer p {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.78;
  color: var(--color-ink-soft);
}

@media (max-width: 640px) {
  .page-features .rules-table {
    min-width: 0;
  }

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

  .page-features .season-chip {
    column-gap: var(--space-2);
  }

  .page-features .season-chip-num {
    font-size: var(--text-lg);
  }
}
<<<END>>>