.page-features {
  --feat-cut: 18px;
  --feat-table-min: 780px;
  --feat-rail-w: 228px;
}

/* ---------- 首屏 ---------- */
.page-features .feat-hero {
  position: relative;
  overflow: hidden;
  padding-block: var(--space-4) var(--space-8);
  background: var(--color-surface);
}

.page-features .feat-hero-deco {
  position: absolute;
  pointer-events: none;
  z-index: 0;
}

.page-features .feat-hero-deco--ring {
  top: 10%;
  right: -60px;
  width: 200px;
  height: 200px;
  border: var(--border-thick) solid var(--color-primary-soft);
  border-radius: 50%;
}

.page-features .feat-hero-deco--sq {
  bottom: -40px;
  left: -50px;
  width: 130px;
  height: 130px;
  background: var(--color-primary-soft);
  border-radius: var(--radius-lg);
  transform: rotate(14deg);
}

.page-features .feat-hero .container {
  position: relative;
  z-index: 1;
}

.page-features .feat-hero .breadcrumbs {
  margin-bottom: var(--space-4);
}

.page-features .feat-hero-title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: 1.02;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  max-width: 15ch;
}

.page-features .feat-hero-lead {
  max-width: 52ch;
  margin: 0;
  color: var(--color-ink-soft);
  font-size: var(--text-lg);
  line-height: var(--leading-body);
}

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

.page-features .feat-stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3);
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - var(--feat-cut)),
    calc(100% - var(--feat-cut)) 100%,
    0 100%
  );
}

.page-features .feat-stat--primary {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-features .feat-stat--accent {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.page-features .feat-stat-num {
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.02em;
}

.page-features .feat-stat-label {
  font-size: var(--text-sm);
  line-height: 1.4;
  opacity: 0.92;
}

/* ---------- 对照区布局 ---------- */
.page-features .feat-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

.page-features .feat-main {
  min-width: 0;
}

.page-features .feat-compare-head {
  margin-bottom: var(--space-6);
}

.page-features .feat-compare-head .h-section {
  margin: 0 0 var(--space-2);
}

.page-features .feat-compare-head .t-lead {
  max-width: 56ch;
  margin: 0;
  color: var(--color-ink-soft);
}

/* ---------- 左侧索引栏 ---------- */
.page-features .feat-rail-title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-ink);
  text-transform: uppercase;
}

.page-features .feat-rail-list {
  display: flex;
  gap: var(--space-1);
  margin: 0;
  padding: 0 0 var(--space-1);
  list-style: none;
  overflow-x: auto;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-features .feat-rail-list li {
  margin: 0;
  flex: 0 0 auto;
}

.page-features .feat-rail-list a {
  display: block;
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-sm);
  font-weight: 700;
  white-space: nowrap;
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: var(--border-thick) solid transparent;
  transition: color 140ms ease, border-color 140ms ease, background-color 140ms ease;
}

.page-features .feat-rail-list a:hover,
.page-features .feat-rail-list a.is-active {
  color: var(--color-ink);
  border-bottom-color: var(--color-primary);
  background: var(--color-primary-soft);
}

.page-features .feat-rail-note {
  margin: var(--space-3) 0 0;
  font-size: var(--text-xs);
  line-height: 2;
  color: var(--color-ink-muted);
}

/* ---------- 支持度方块 ---------- */
.page-features .feat-dot {
  display: inline-block;
  width: var(--space-2);
  height: var(--space-2);
  margin-right: var(--space-1);
  border-radius: var(--radius-sm);
  vertical-align: -3px;
}

.page-features .feat-dot--full {
  background: var(--color-accent);
}

.page-features .feat-dot--part {
  background: var(--color-primary);
}

.page-features .feat-dot--none {
  background: var(--color-surface-deep);
  border: var(--border-thin) solid var(--color-ink-muted);
}

/* ---------- 图片 ---------- */
.page-features .feat-fig {
  margin: 0 0 var(--space-3);
}

.page-features .feat-fig--banner {
  margin-bottom: var(--space-6);
}

.page-features .feat-fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface-deep);
}

.page-features .feat-fig--banner img {
  aspect-ratio: 12 / 7;
}

.page-features .feat-fig-cap {
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  line-height: 1.5;
  color: var(--color-ink-muted);
}

/* ---------- 表格分组 ---------- */
.page-features .feat-group {
  border-top: 0;
}

.page-features .feat-group-summary {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  cursor: pointer;
  list-style: none;
  border-bottom: var(--border-thick) solid var(--color-accent);
}

.page-features .feat-group-summary::-webkit-details-marker {
  display: none;
}

.page-features .feat-group-summary::after {
  content: "＋";
  margin-left: var(--space-2);
  font-size: var(--text-lg);
  line-height: 1;
  color: var(--color-ink-muted);
}

.page-features .feat-group[open] .feat-group-summary::after {
  content: "－";
}

.page-features .feat-group-num {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-primary);
}

.page-features .feat-group-name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-features .feat-group-meta {
  margin-left: auto;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-features .feat-scroll {
  margin-block: var(--space-2) var(--space-4);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.page-features .feat-table {
  width: 100%;
  min-width: var(--feat-table-min);
  border-collapse: collapse;
}

.page-features .feat-table thead th {
  padding: var(--space-2);
  text-align: left;
  font-size: var(--text-sm);
  font-weight: 700;
  white-space: nowrap;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.page-features .feat-table tbody th,
.page-features .feat-table tbody td {
  padding: var(--space-2);
  text-align: left;
  vertical-align: top;
  font-size: var(--text-sm);
  font-weight: 400;
  line-height: 1.5;
  color: var(--color-ink);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-features .feat-table tbody th {
  font-weight: 700;
  width: 20%;
  min-width: 170px;
}

.page-features .feat-table thead th:first-child {
  width: 20%;
  min-width: 170px;
}

.page-features .feat-table tbody tr:hover > th,
.page-features .feat-table tbody tr:hover > td {
  background: var(--color-highlight);
}

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

.page-features .feat-row-note {
  display: block;
  margin-top: 0.25em;
  font-size: var(--text-xs);
  font-weight: 400;
  color: var(--color-ink-muted);
}

.page-features .feat-cell-note {
  display: block;
  margin-top: 0.4em;
  font-size: var(--text-xs);
  line-height: 1.45;
  color: var(--color-ink-muted);
}

/* ---------- 刻度分隔线 ---------- */
.page-features .feat-ticks {
  position: relative;
  height: var(--space-2);
  margin-block: var(--space-4);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-features .feat-ticks::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: var(--space-1);
  background-image: repeating-linear-gradient(
    90deg,
    var(--color-line) 0 2px,
    transparent 2px var(--space-3)
  );
}

/* ---------- 通用小节抬头 ---------- */
.page-features .feat-section-head {
  margin-bottom: var(--space-6);
}

.page-features .feat-section-head .h-section {
  margin: 0 0 var(--space-2);
}

.page-features .feat-section-head .t-lead {
  max-width: 58ch;
  margin: 0;
  color: var(--color-ink-soft);
}

/* ---------- 分组解读 ---------- */
.page-features .feat-read-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-8);
}

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

.page-features .feat-read p {
  max-width: 48ch;
  margin: 0 0 var(--space-2);
  color: var(--color-ink-soft);
  line-height: var(--leading-body);
}

.page-features .feat-read:nth-child(2) .feat-fig img {
  aspect-ratio: 4 / 5;
}

.page-features .feat-read:nth-child(1) .feat-fig img,
.page-features .feat-read:nth-child(3) .feat-fig img {
  aspect-ratio: 10 / 7;
}

/* ---------- 场景建议 ---------- */
.page-features .feat-scenes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-features .feat-scene {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-2);
  padding: var(--space-3) 0 var(--space-3) var(--space-3);
  border-left: var(--border-thick) solid var(--color-primary);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-features .feat-scene:nth-child(2n) {
  border-left-color: var(--color-accent);
}

.page-features .feat-scene-num {
  font-size: var(--text-xl);
  font-weight: 700;
  line-height: 1;
  color: var(--color-ink-muted);
}

.page-features .feat-scene-body h3 {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-features .feat-scene-body p {
  max-width: 46ch;
  margin: 0;
  color: var(--color-ink-soft);
  line-height: var(--leading-body);
}

.page-features .feat-scene-pick {
  margin-top: var(--space-2) !important;
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-ink);
}

.page-features .feat-scene-pick .chip {
  margin-right: var(--space-1);
}

.page-features .feat-scenes-foot {
  max-width: 58ch;
  margin: var(--space-6) 0 0;
  padding-left: var(--space-3);
  border-left: var(--border-thick) solid var(--color-primary);
  color: var(--color-ink-soft);
  line-height: var(--leading-body);
}

.page-features .feat-scenes-foot a {
  color: var(--color-ink);
  text-decoration: underline;
  text-decoration-color: var(--color-primary);
  text-underline-offset: 3px;
}

.page-features .feat-scenes-foot a:hover {
  color: var(--color-focus);
  text-decoration-color: var(--color-focus);
}

/* ---------- 能力边界 ---------- */
.page-features .feat-limits {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
}

.page-features .feat-limit {
  padding: var(--space-3);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  border-top: var(--border-thick) solid var(--color-primary);
}

.page-features .feat-limit:nth-child(2n) {
  border-top-color: var(--color-accent);
}

.page-features .feat-limit:nth-child(3n) {
  border-top-color: var(--color-ink-muted);
}

.page-features .feat-limit-k {
  margin: 0 0 var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
}

.page-features .feat-limit h3 {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

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

/* ---------- 页尾深色面板 ---------- */
.page-features .feat-next-panel {
  position: relative;
  overflow: hidden;
  padding: var(--space-6) var(--space-4);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-radius: var(--radius-lg);
}

.page-features .feat-next-eyebrow {
  color: var(--color-contrast-accent);
}

.page-features .feat-next-panel h2 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
  color: var(--color-contrast-accent);
}

.page-features .feat-next-lead {
  max-width: 56ch;
  margin: 0;
  color: var(--color-contrast-ink);
  opacity: 0.86;
  line-height: var(--leading-body);
}

.page-features .feat-next-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-2);
  margin: var(--space-4) 0 0;
  padding: 0;
  list-style: none;
}

.page-features .feat-next-list a {
  display: block;
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-md);
  color: var(--color-contrast-ink);
  text-decoration: none;
  transition: border-color 150ms ease, background-color 150ms ease, color 150ms ease;
}

.page-features .feat-next-list a:hover {
  border-color: var(--color-contrast-accent);
  background: color-mix(in srgb, var(--color-contrast-accent) 14%, transparent);
}

.page-features .feat-next-label {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-contrast-accent);
}

.page-features .feat-next-name {
  display: block;
  margin-top: var(--space-1);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
}

.page-features .feat-next-desc {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  line-height: 1.55;
  opacity: 0.78;
}

.page-features .feat-next-list a:hover .feat-next-name,
.page-features .feat-next-list a:hover .feat-next-label {
  color: var(--color-contrast-accent);
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-features .feat-hero {
    padding-block: var(--space-6) var(--space-8);
  }

  .page-features .feat-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-features .feat-scenes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-6);
  }

  .page-features .feat-limits {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-4);
  }

  .page-features .feat-next-panel {
    padding: var(--space-8) var(--space-6);
  }

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

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-features .feat-read-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-8) var(--space-6);
  }

  .page-features .feat-read:nth-child(even) {
    margin-top: var(--space-6);
  }
}

@media (min-width: 1000px) {
  .page-features .feat-layout {
    grid-template-columns: var(--feat-rail-w) minmax(0, 1fr);
    gap: var(--space-6);
    align-items: start;
  }

  .page-features .feat-rail {
    position: sticky;
    top: var(--space-4);
  }

  .page-features .feat-rail-title {
    margin-bottom: var(--space-3);
  }

  .page-features .feat-rail-list {
    display: block;
    padding-bottom: 0;
    overflow: visible;
    border-bottom: 0;
    border-left: var(--border-thin) solid var(--color-line);
  }

  .page-features .feat-rail-list li + li {
    margin-top: var(--space-1);
  }

  .page-features .feat-rail-list a {
    padding: var(--space-1) var(--space-2);
    white-space: normal;
    border-bottom: 0;
    border-left: var(--border-thick) solid transparent;
    margin-left: calc(var(--border-thin) * -1);
  }

  .page-features .feat-rail-list a:hover,
  .page-features .feat-rail-list a.is-active {
    border-bottom-color: transparent;
    border-left-color: var(--color-primary);
    background: var(--color-primary-soft);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-features .feat-rail-list a,
  .page-features .feat-next-list a {
    transition: none;
  }
}