/* ============================================================
   数据能力看板 · 页面专属样式
   作用域限定：.page-features
   ============================================================ */

.page-features {
  --feat-hero-lift: 18px;
  --feat-metric-radius: var(--radius-md);
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

.page-features h2,
.page-features h3 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-features .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

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

/* ---------- 首屏：深色关键数字带 ---------- */

.page-features .feat-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: var(--space-8) 0 calc(var(--space-6) + 28px);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 calc(100% - 26px));
}

.page-features .feat-hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.5;
}

.page-features .feat-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: var(--overlay-scrim);
  pointer-events: none;
}

.page-features .feat-hero-inner {
  position: relative;
  z-index: 2;
}

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

.page-features .feat-crumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--text-sm);
}

.page-features .feat-crumb li + li::before {
  content: "/";
  margin-right: var(--space-1);
  color: var(--color-contrast-line);
}

.page-features .feat-crumb a {
  color: var(--color-contrast-ink);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  transition: border-color 180ms ease-out, color 180ms ease-out;
}

.page-features .feat-crumb a:hover,
.page-features .feat-crumb a:focus-visible {
  color: var(--color-contrast-accent);
  border-bottom-color: var(--color-contrast-accent);
}

.page-features .feat-crumb li[aria-current="page"] {
  color: var(--color-contrast-ink);
  opacity: 0.72;
}

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

.page-features .feat-hero-title {
  margin: var(--space-2) 0 0;
  max-width: 20ch;
  font-size: var(--text-display);
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--color-contrast-ink);
}

.page-features .feat-hero-lede {
  margin: var(--space-3) 0 0;
  max-width: 62ch;
  color: var(--color-contrast-ink);
  opacity: 0.86;
}

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

.page-features .feat-hero-stat {
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-features .feat-hero-stat-value {
  display: block;
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-contrast-accent);
  letter-spacing: -0.02em;
}

.page-features .feat-hero-stat-unit {
  display: inline-block;
  margin-left: var(--space-1);
  font-size: var(--text-sm);
  font-family: var(--font-body);
  color: var(--color-contrast-ink);
  opacity: 0.7;
}

.page-features .feat-hero-stat-note {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-contrast-ink);
  opacity: 0.72;
}

/* ---------- 看板引子 ---------- */

.page-features .feat-intro {
  padding: var(--space-8) 0 var(--section-y);
  background-color: var(--color-surface);
}

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

.page-features .feat-media {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
  background-color: var(--color-surface-deep);
}

.page-features .feat-media--wide img {
  aspect-ratio: 16 / 9;
}

.page-features .feat-media--square img {
  aspect-ratio: 1 / 1;
}

.page-features .feat-media--portrait img {
  aspect-ratio: 4 / 3;
}

.page-features .feat-intro-title {
  margin: var(--space-2) 0 var(--space-3);
  font-size: var(--text-2xl);
  max-width: 24ch;
}

.page-features .feat-intro-body p {
  max-width: var(--measure);
  color: var(--color-ink-soft);
}

/* ---------- 五个指标分区 ---------- */

.page-features .feat-band {
  padding: var(--section-y) 0;
}

.page-features .feat-band--a {
  background-color: var(--color-surface-alt);
}

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

.page-features .feat-band--c {
  background-color: var(--color-highlight);
}

.page-features .feat-band--d {
  background-color: var(--color-surface-deep);
}

.page-features .feat-band--e {
  background-color: var(--color-surface-alt);
}

.page-features .feat-group {
  display: block;
}

.page-features .feat-group-summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-1) 0;
  cursor: pointer;
  list-style: none;
  border-radius: var(--radius-sm);
  transition: color 180ms ease-out;
}

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

.page-features .feat-group-summary:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 4px;
}

.page-features .feat-group-num {
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-primary);
}

.page-features .feat-group-head {
  display: block;
}

.page-features .feat-group-title {
  display: block;
  margin-top: 2px;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-features .feat-group-count {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  white-space: nowrap;
}

.page-features .feat-group[open] .feat-group-count {
  color: var(--color-primary);
}

.page-features .feat-group-body {
  padding-top: var(--space-3);
}

.page-features .feat-group-lede {
  max-width: var(--measure);
  margin: 0 0 var(--space-4);
  color: var(--color-ink-soft);
}

.page-features .metric-list {
  display: grid;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-features .metric {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-2);
  border-radius: var(--feat-metric-radius);
  transition: background-color 200ms ease-out, transform 200ms ease-out, box-shadow 200ms ease-out;
}

.page-features .metric:hover,
.page-features .metric:focus-visible {
  background-color: color-mix(in srgb, var(--color-surface) 68%, transparent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-1);
}

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

.page-features .metric-value {
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: 1.1;
  color: var(--color-primary);
  letter-spacing: -0.01em;
  transition: color 200ms ease-out;
}

.page-features .metric:hover .metric-value,
.page-features .metric:focus-visible .metric-value {
  color: var(--color-accent);
}

.page-features .metric-unit {
  margin-left: var(--space-1);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-body);
  color: var(--color-ink-muted);
}

.page-features .metric-name {
  margin: 0 0 var(--space-1);
  font-size: var(--text-base);
}

.page-features .metric-def {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-soft);
  transition: color 200ms ease-out;
}

.page-features .metric:hover .metric-def,
.page-features .metric:focus-visible .metric-def {
  color: var(--color-ink);
}

.page-features .metric-meta {
  margin: var(--space-1) 0 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.6;
  color: var(--color-ink-muted);
}

/* ---------- 口径与校验 ---------- */

.page-features .feat-check {
  padding: var(--section-y-lg) 0;
  background-color: var(--color-surface);
}

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

.page-features .feat-media-note {
  margin: var(--space-2) 0 0;
  font-size: var(--text-xs);
  line-height: 1.6;
  color: var(--color-ink-muted);
  max-width: 46ch;
}

.page-features .feat-check-title {
  margin: var(--space-2) 0 var(--space-3);
  font-size: var(--text-2xl);
  max-width: 22ch;
}

.page-features .feat-check-lede {
  margin: 0 0 var(--space-4);
  max-width: var(--measure);
  color: var(--color-ink-soft);
}

.page-features .feat-check-list {
  display: grid;
  gap: var(--space-2);
}

.page-features .feat-check-item {
  border-radius: var(--radius-md);
  background-color: var(--color-surface-alt);
  padding: var(--space-2) var(--space-3);
  transition: background-color 200ms ease-out;
}

.page-features .feat-check-item[open] {
  background-color: var(--color-primary-soft);
}

.page-features .feat-check-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  cursor: pointer;
  list-style: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  color: var(--color-ink);
}

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

.page-features .feat-check-summary:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
}

.page-features .feat-ver {
  display: inline-block;
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-size: var(--text-xs);
  letter-spacing: 0.02em;
}

.page-features .feat-check-item[open] .feat-ver {
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
}

.page-features .feat-check-item p {
  margin: var(--space-2) 0 0;
  max-width: var(--measure);
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--color-ink);
}

/* ---------- 检索与筛选 ---------- */

.page-features .feat-search {
  padding: var(--section-y) 0;
  background-color: var(--color-highlight);
}

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

.page-features .feat-search-title {
  margin: var(--space-2) 0 var(--space-3);
  font-size: var(--text-2xl);
  max-width: 24ch;
}

.page-features .feat-search-lede {
  margin: 0 0 var(--space-4);
  max-width: var(--measure);
  color: var(--color-ink-soft);
}

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

.page-features .feat-dim {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-features .feat-dim-num {
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.2;
  color: var(--color-primary);
}

.page-features .feat-dim-body h3 {
  margin: 0 0 var(--space-1);
  font-size: var(--text-base);
}

.page-features .feat-dim-body p {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-soft);
  max-width: 62ch;
}

.page-features .feat-dim-meta {
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

/* ---------- 相邻栏目入口 ---------- */

.page-features .feat-next {
  padding: var(--section-y) 0;
  background-color: var(--color-surface-alt);
}

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

.page-features .feat-next-title {
  margin: var(--space-2) 0 0;
  font-size: var(--text-2xl);
  max-width: 26ch;
}

.page-features .feat-next-list {
  display: grid;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-features .feat-next-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-3);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: inherit;
  transition: background-color 200ms ease-out, transform 200ms ease-out, box-shadow 200ms ease-out;
}

.page-features .feat-next-item:hover,
.page-features .feat-next-item:focus-visible {
  background-color: var(--color-surface);
  transform: translateY(-2px);
  box-shadow: var(--shadow-1);
}

.page-features .feat-next-item:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.page-features .feat-next-num {
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-primary);
  line-height: 1;
}

.page-features .feat-next-text {
  display: block;
}

.page-features .feat-next-text strong {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
  margin-bottom: 2px;
}

.page-features .feat-next-text span {
  display: block;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
  max-width: 66ch;
}

.page-features .feat-next-go {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  color: var(--color-ink-muted);
  transition: color 200ms ease-out, transform 200ms ease-out;
}

.page-features .feat-next-item:hover .feat-next-go,
.page-features .feat-next-item:focus-visible .feat-next-go {
  color: var(--color-accent);
  transform: translateX(3px);
}

/* ---------- 小屏适配 ---------- */

@media (max-width: 559px) {
  .page-features .feat-hero {
    clip-path: polygon(0 0, 100% 0, 100% 100%, 0 calc(100% - 16px));
    padding-bottom: calc(var(--space-6) + 18px);
  }

  .page-features .feat-hero-title {
    max-width: none;
  }

  .page-features .feat-group-summary {
    grid-template-columns: auto 1fr;
    gap: var(--space-2);
  }

  .page-features .feat-group-count {
    grid-column: 2 / 3;
  }

  .page-features .feat-next-item {
    padding: var(--space-3) var(--space-2);
  }
}

/* ---------- 中等宽度 ---------- */

@media (min-width: 640px) {
  .page-features .feat-hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
  }

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

/* ---------- 桌面布局 ---------- */

@media (min-width: 900px) {
  .page-features .feat-hero-stats {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-3);
  }

  .page-features .feat-hero-stat:nth-child(2),
  .page-features .feat-hero-stat:nth-child(4) {
    transform: translateY(var(--feat-hero-lift));
  }

  .page-features .feat-intro-grid {
    grid-template-columns: 5fr 7fr;
    align-items: center;
    gap: var(--space-8);
  }

  .page-features .feat-intro-title {
    font-size: var(--text-3xl);
  }

  .page-features .metric {
    grid-template-columns: minmax(170px, 4fr) 8fr;
    gap: var(--space-4);
    align-items: baseline;
  }

  .page-features .metric-value {
    text-align: right;
  }

  .page-features .feat-check-grid {
    grid-template-columns: 4fr 8fr;
    align-items: start;
    gap: var(--space-8);
  }

  .page-features .feat-check-media {
    position: sticky;
    top: var(--space-8);
  }

  .page-features .feat-check-title,
  .page-features .feat-search-title,
  .page-features .feat-next-title {
    font-size: var(--text-3xl);
  }

  .page-features .feat-search-grid {
    grid-template-columns: 7fr 5fr;
    align-items: start;
    gap: var(--space-8);
  }

  .page-features .feat-search-media {
    position: sticky;
    top: var(--space-8);
  }

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

  .page-features .feat-dim:nth-child(5) {
    grid-column: 1 / 2;
  }
}

@media (min-width: 1024px) {
  .page-features .feat-group-summary {
    gap: var(--space-4);
  }

  .page-features .feat-group-num {
    font-size: var(--text-4xl);
  }
}