.page-features {
  position: relative;
  isolation: isolate;
  overflow-x: clip;
}

.page-features::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 62vh;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(58% 78% at 12% 0%, color-mix(in srgb, var(--color-primary) 26%, transparent), transparent 72%),
    radial-gradient(46% 62% at 92% 8%, color-mix(in srgb, var(--color-accent) 11%, transparent), transparent 70%);
}

/* ---------- 首屏 ---------- */

.page-features .feat-hero-grid {
  display: grid;
  gap: var(--space-4);
}

.page-features .feat-hero-copy .display {
  margin: var(--space-2) 0 var(--space-3);
}

.page-features .feat-hero-copy .lede {
  max-width: var(--measure);
}

.page-features .feat-hero-visual {
  position: relative;
  margin: 0;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface-alt);
  box-shadow: var(--shadow-2);
}

.page-features .feat-hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-features .feat-cap {
  margin: 0;
  padding: var(--space-2) var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
}

/* 关键数字条 */

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

.page-features .feat-stat {
  display: flex;
  flex-direction: column;
  gap: calc(var(--space-1) / 2);
  padding: var(--space-3);
  background: var(--color-surface-alt);
}

.page-features .feat-stat .stat-figure {
  color: var(--color-accent);
  font-family: var(--font-mono);
  line-height: 1.05;
}

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

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

/* ---------- 能力矩阵 ---------- */

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

.page-features .matrix {
  display: grid;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.page-features .matrix-cell {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background:
    linear-gradient(158deg, color-mix(in srgb, var(--color-primary) 16%, transparent), transparent 62%),
    var(--color-surface-alt);
  transition: border-color 220ms ease, box-shadow 220ms ease, transform 220ms ease;
}

.page-features .matrix-cell::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: var(--border-thin);
  background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--color-accent) 45%, transparent), transparent);
  opacity: 0;
  transition: opacity 220ms ease;
}

.page-features .matrix-cell:hover,
.page-features .matrix-cell:focus-visible {
  border-color: color-mix(in srgb, var(--color-accent) 55%, transparent);
  box-shadow: var(--shadow-1);
  transform: translateY(calc(var(--space-1) * -0.5));
}

.page-features .matrix-cell:hover::after,
.page-features .matrix-cell:focus-visible::after {
  opacity: 1;
}

.page-features .matrix-count {
  color: var(--color-ink);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
}

.page-features .matrix-desc {
  margin: 0;
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
}

.page-features .matrix-deliver {
  margin: 0;
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
  color: var(--color-ink-muted);
  font-size: var(--text-xs);
  transition: color 220ms ease;
}

.page-features .matrix-cell:hover .matrix-deliver,
.page-features .matrix-cell:focus-visible .matrix-deliver {
  color: var(--color-accent);
}

/* ---------- 功能条目 ---------- */

.page-features .section-head {
  display: grid;
  gap: var(--space-1);
  max-width: var(--measure);
}

.page-features .section-head h2 {
  margin: 0;
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
}

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

.page-features .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-top: var(--space-3);
}

.page-features .feature-list {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.page-features .filter-item[hidden] {
  display: none;
}

.page-features .feature-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
}

.page-features .feature-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-1);
}

.page-features .feature-status {
  color: var(--color-accent);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
}

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

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

.page-features .feature-fields {
  display: grid;
  gap: var(--space-2);
  margin: 0;
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-features .feature-field {
  display: grid;
  gap: calc(var(--space-1) / 2);
}

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

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

.page-features .feature-strip {
  grid-column: 1 / -1;
  margin: 0;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-surface-alt);
}

.page-features .feature-strip img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-features .feature-strip figcaption {
  padding: var(--space-2) var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
}

/* ---------- 边界区块 ---------- */

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

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

.page-features .boundary-lede {
  max-width: var(--measure);
  margin: var(--space-2) 0 0;
  color: var(--color-contrast-ink);
  opacity: 0.78;
  font-size: var(--text-base);
}

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

.page-features .boundary-item {
  padding-left: var(--space-2);
  border-left: var(--border-thin) solid var(--color-contrast-accent);
}

.page-features .boundary-name {
  margin: 0;
  color: var(--color-contrast-ink);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
}

.page-features .boundary-text {
  margin: var(--space-1) 0 0;
  color: var(--color-contrast-ink);
  opacity: 0.8;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
}

/* ---------- 进阶入口 ---------- */

.page-features .advanced-gate {
  display: grid;
  gap: var(--space-4);
  align-items: center;
}

.page-features .advanced-copy h2 {
  margin: var(--space-1) 0 var(--space-2);
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  line-height: var(--leading-heading);
}

.page-features .advanced-copy .lede {
  max-width: var(--measure);
  margin: 0 0 var(--space-2);
}

.page-features .advanced-copy .muted {
  max-width: var(--measure);
  margin: 0 0 var(--space-3);
  font-size: var(--text-sm);
}

.page-features .advanced-visual {
  margin: 0;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface-alt);
  box-shadow: var(--shadow-1);
}

.page-features .advanced-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
}

/* ---------- 后续入口 ---------- */

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

.page-features .next-grid {
  display: grid;
  gap: var(--space-3);
}

.page-features .next-line {
  margin: 0;
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
}

.page-features .next-line a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 45%, transparent);
}

.page-features .next-line a:hover,
.page-features .next-line a:focus-visible {
  border-bottom-color: var(--color-focus);
  color: var(--color-focus);
}

/* ---------- 断点 ---------- */

@media (min-width: 620px) {
  .page-features .feature-card {
    padding: var(--space-4);
  }

  .page-features .feature-field {
    grid-template-columns: minmax(76px, auto) minmax(0, 1fr);
    gap: var(--space-2);
    align-items: start;
  }

  .page-features .feature-field dt {
    padding-top: calc(var(--space-1) / 2);
  }
}

@media (min-width: 820px) {
  .page-features .feat-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-features .matrix {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-3);
  }

  .page-features .matrix-cell:nth-child(2) {
    transform: translateY(calc(var(--space-3) * -1));
  }

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

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

@media (min-width: 900px) {
  .page-features .feat-hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: center;
    gap: var(--space-6);
  }

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

  .page-features .advanced-gate {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
    gap: var(--space-6);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-features .matrix-cell,
  .page-features .matrix-cell::after,
  .page-features .matrix-deliver {
    transition: none;
  }

  .page-features .matrix-cell:hover,
  .page-features .matrix-cell:focus-visible {
    transform: none;
  }

  .page-features .matrix-cell:nth-child(2) {
    transform: none;
  }
}