.page-features {
  --feat-axis: 12px;
  --feat-pad-left: 34px;
  --feat-node-size: 8px;
  color: var(--color-ink);
}

@media (min-width: 900px) {
  .page-features {
    --feat-axis: 36px;
    --feat-pad-left: 84px;
  }
}

/* ---------- 首屏 ---------- */
.page-features .feat-hero {
  padding-top: var(--space-4);
  padding-bottom: var(--space-6);
  background: var(--color-surface);
  overflow: hidden;
}

.page-features .feat-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-4);
}

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

.page-features .feat-display {
  margin: var(--space-2) 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: 700;
  line-height: 1.04;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-features .feat-display span {
  display: block;
  color: var(--color-primary);
}

.page-features .feat-hero-lede {
  max-width: 48ch;
  margin: 0 0 var(--space-4);
  font-size: var(--text-lg);
  line-height: 1.65;
  color: var(--color-ink-soft);
}

.page-features .feat-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.page-features .feat-hero-panel {
  position: relative;
  padding: var(--space-4);
  background-color: var(--color-contrast-surface);
  background-image: repeating-linear-gradient(
    0deg,
    var(--color-contrast-line) 0 1px,
    transparent 1px 68px
  );
  color: var(--color-contrast-ink);
}

.page-features .feat-panel-kicker {
  margin: 0;
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-contrast-ink);
  opacity: 0.62;
}

.page-features .feat-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3) var(--space-4);
  margin: var(--space-3) 0 0;
  padding: 0;
  list-style: none;
}

.page-features .feat-stat {
  display: flex;
  flex-direction: column;
  gap: calc(var(--space-1) / 2);
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-features .feat-stat-num {
  font-size: var(--text-4xl);
  line-height: 1;
  color: var(--color-contrast-accent);
}

.page-features .feat-stat-label {
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--color-contrast-ink);
  opacity: 0.8;
}

@media (min-width: 900px) {
  .page-features .feat-hero {
    padding-top: var(--space-6);
    padding-bottom: var(--space-8);
  }

  .page-features .feat-hero-grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 1fr);
    gap: 0;
    align-items: stretch;
  }

  .page-features .feat-hero-copy {
    align-self: center;
    padding-right: var(--space-6);
    padding-top: var(--space-4);
    padding-bottom: var(--space-4);
  }

  .page-features .feat-hero-panel {
    clip-path: polygon(11% 0, 100% 0, 100% 100%, 0 100%);
    padding: var(--space-6) var(--space-4) var(--space-6) var(--space-8);
  }

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

/* ---------- 分组跳转 ---------- */
.page-features .feat-jump {
  background: var(--color-surface-alt);
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-features .feat-jump-list {
  display: flex;
  gap: var(--space-3);
  margin: 0;
  padding: var(--space-2) 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-features .feat-jump-list::-webkit-scrollbar {
  display: none;
}

.page-features .feat-jump-link {
  display: inline-flex;
  align-items: center;
  gap: calc(var(--space-1) / 2);
  padding: calc(var(--space-1) / 2) 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: var(--border-thick) solid transparent;
  transition: color 180ms ease-out, border-color 180ms ease-out;
}

.page-features .feat-jump-link::before {
  content: "";
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  background: var(--color-primary);
  border-radius: 1px;
}

.page-features .feat-jump-link:hover,
.page-features .feat-jump-link:focus-visible {
  color: var(--color-primary);
}

.page-features .feat-jump-link[data-active] {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.page-features .feat-jump-link[data-active]::before {
  background: var(--color-accent);
}

/* ---------- 时间轴主干 ---------- */
.page-features .feat-track {
  position: relative;
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
}

.page-features .feat-track::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: var(--feat-axis);
  width: var(--border-thin);
  background: var(--color-line);
}

.page-features .feat-group {
  position: relative;
  padding-left: var(--feat-pad-left);
  padding-bottom: var(--space-8);
}

.page-features .feat-group:last-child {
  padding-bottom: 0;
}

.page-features .feat-node {
  position: absolute;
  left: var(--feat-axis);
  top: 6px;
  width: var(--feat-node-size);
  height: var(--feat-node-size);
  margin-left: calc(var(--feat-node-size) / -2);
  background: var(--color-primary);
  border-radius: var(--radius-pill);
  z-index: 1;
}

.page-features .feat-node--data {
  border-radius: 1px;
}

.page-features .feat-node--accent {
  background: var(--color-accent);
  border-radius: 1px;
}

.page-features .feat-group-head {
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-features .feat-group-meta {
  margin: 0 0 calc(var(--space-1) / 2);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}

.page-features .feat-group-title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: clamp(var(--text-xl), 3.4vw, var(--text-3xl));
  font-weight: var(--weight-heading);
  line-height: 1.22;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-features .feat-group-lede {
  max-width: var(--measure);
  margin: 0;
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

.page-features .feat-group-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
  align-items: start;
}

@media (min-width: 900px) {
  .page-features .feat-group-body {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: var(--space-6);
  }

  .page-features .feat-group--flip .feat-group-body {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-features .feat-group--flip .feat-points-wrap {
    order: 2;
  }

  .page-features .feat-group--flip .feat-visual {
    order: 1;
  }
}

/* ---------- 要点清单 ---------- */
.page-features .feat-points-wrap {
  min-width: 0;
}

.page-features .feat-points {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-features .feat-point {
  position: relative;
  padding: var(--space-2) var(--space-4) var(--space-2) var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
  font-size: var(--text-base);
  line-height: 1.62;
  color: var(--color-ink);
  transition: background-color 180ms ease-out;
}

.page-features .feat-point::before {
  content: "";
  position: absolute;
  left: 0;
  top: calc(var(--space-2) + 0.62em);
  width: 8px;
  height: var(--border-thin);
  background: var(--color-primary);
  transition: background-color 180ms ease-out, width 180ms ease-out;
}

.page-features .feat-point::after {
  content: "";
  position: absolute;
  right: var(--space-2);
  top: 50%;
  width: 6px;
  height: 6px;
  margin-top: -3px;
  background: var(--color-accent);
  border-radius: 1px;
  opacity: 0;
  transition: opacity 180ms ease-out;
}

.page-features .feat-point:hover {
  background: var(--color-primary-soft);
}

.page-features .feat-point:hover::before {
  width: 14px;
  background: var(--color-accent);
}

.page-features .feat-point:hover::after {
  opacity: 1;
}

.page-features .feat-quote {
  margin: var(--space-3) 0 0;
}

.page-features .feat-inline-link {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 3px;
}

.page-features .feat-inline-link:hover,
.page-features .feat-inline-link:focus-visible {
  color: var(--color-accent);
}

/* ---------- 栏目条目 ---------- */
.page-features .feat-chips {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-features .feat-chip {
  display: grid;
  grid-template-columns: auto minmax(0, auto) minmax(0, 1fr);
  align-items: baseline;
  gap: var(--space-2);
  padding: calc(var(--space-1) + 2px) var(--space-2) calc(var(--space-1) + 2px) 0;
  border-bottom: var(--border-thin) dotted var(--color-line);
}

.page-features .feat-chip-code {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-features .feat-chip-name {
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-ink);
}

.page-features .feat-chip-note {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  text-align: right;
}

/* ---------- 版本节点条 ---------- */
.page-features .feat-version-strip {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-content: flex-start;
  padding: var(--space-3);
  background: var(--color-surface-alt);
  border-radius: var(--radius-md);
  border-left: var(--border-thick) solid var(--color-primary);
}

.page-features .feat-version-node {
  display: inline-flex;
  align-items: center;
  gap: calc(var(--space-1) / 2);
  padding: calc(var(--space-1) / 2) var(--space-2);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.page-features .feat-version-node .mono {
  font-size: var(--text-xs);
  color: var(--color-primary);
}

.page-features .feat-version-node--accent {
  border-color: var(--color-accent);
  color: var(--color-ink);
}

.page-features .feat-version-node--accent .mono {
  color: var(--color-accent);
}

/* ---------- 图文视觉 ---------- */
.page-features .feat-visual {
  margin: 0;
  min-width: 0;
}

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

.page-features .feat-visual-cap {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

/* ---------- 夜景条带 ---------- */
.page-features .feat-scene {
  position: relative;
  overflow: hidden;
  margin-top: var(--space-8);
}

.page-features .feat-scene img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: clamp(200px, 32vw, 420px);
  object-fit: cover;
}

.page-features .feat-scene-veil {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}

.page-features .feat-scene-cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: var(--space-4);
  max-width: 42ch;
  margin: 0 auto;
  padding: 0 var(--space-4);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-contrast-ink);
  text-align: center;
}

/* ---------- 后续入口 ---------- */
.page-features .feat-next {
  background: var(--color-surface);
}

.page-features .feat-next-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.page-features .feat-next-lead {
  display: block;
  padding: var(--space-4);
  background: var(--color-contrast-surface);
  border-left: var(--border-thick) solid var(--color-contrast-accent);
  color: var(--color-contrast-ink);
  text-decoration: none;
  transition: border-color 180ms ease-out;
}

.page-features .feat-next-lead:hover,
.page-features .feat-next-lead:focus-visible {
  border-left-color: var(--color-contrast-ink);
}

.page-features .feat-next-kicker {
  display: block;
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-contrast-accent);
}

.page-features .feat-next-title {
  display: block;
  margin: var(--space-2) 0;
  font-size: var(--text-xl);
  font-weight: 600;
  line-height: 1.3;
}

.page-features .feat-next-text {
  display: block;
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-contrast-ink);
  opacity: 0.8;
}

.page-features .feat-next-arrow {
  display: block;
  margin-top: var(--space-3);
  font-size: var(--text-lg);
  color: var(--color-contrast-accent);
  transition: transform 180ms ease-out;
}

.page-features .feat-next-lead:hover .feat-next-arrow,
.page-features .feat-next-lead:focus-visible .feat-next-arrow {
  transform: translateX(6px);
}

.page-features .feat-next-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-features .feat-next-list li {
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-features .feat-next-list a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  font-size: var(--text-base);
  line-height: 1.5;
  color: var(--color-ink);
  text-decoration: none;
  transition: color 180ms ease-out;
}

.page-features .feat-next-list a::after {
  content: "→";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  transition: transform 180ms ease-out, color 180ms ease-out;
}

.page-features .feat-next-list a:hover,
.page-features .feat-next-list a:focus-visible {
  color: var(--color-primary);
}

.page-features .feat-next-list a:hover::after,
.page-features .feat-next-list a:focus-visible::after {
  color: var(--color-accent);
  transform: translateX(4px);
}

@media (min-width: 900px) {
  .page-features .feat-next-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: var(--space-6);
  }
}

/* ---------- 焦点可见性 ---------- */
.page-features a:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
}
</main>