/* ===== 数据模块页 page-features ===== */

.page-features {
  --feat-rule: var(--border-thin) solid var(--color-line);
  --feat-strip-gap: var(--space-3);
}

/* ---------- 首屏 ---------- */

.page-features .feat-hero {
  position: relative;
  padding-block: var(--space-6) var(--space-8);
  background: linear-gradient(158deg,
      var(--color-surface-deep) 0%,
      var(--color-surface-alt) 40%,
      var(--color-surface) 100%);
  border-bottom: var(--feat-rule);
  overflow: hidden;
}

.page-features .feat-hero::after {
  content: "";
  position: absolute;
  top: -34%;
  right: -14%;
  width: 44%;
  height: 126%;
  background: var(--color-primary-soft);
  transform: rotate(-13deg);
  pointer-events: none;
  z-index: 0;
}

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

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

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

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

.page-features .hero-title {
  margin: var(--space-3) 0 var(--space-4);
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  max-width: 18ch;
}

.page-features .hero-copy .lead {
  max-width: 46ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-features .hero-index {
  margin: var(--space-6) 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--feat-rule);
}

.page-features .hero-index li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: var(--space-2);
  align-items: baseline;
  padding: var(--space-2) 0;
  border-bottom: var(--feat-rule);
}

.page-features .hi-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
  letter-spacing: 0.06em;
}

.page-features .hi-name {
  font-size: var(--text-sm);
  color: var(--color-ink);
}

.page-features .hi-meta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-features .hero-media {
  position: relative;
  margin: 0;
  min-width: 0;
}

.page-features .hero-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: var(--feat-rule);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-2);
}

.page-features .hero-bands {
  position: absolute;
  inset: auto 0 0 0;
  display: flex;
  gap: 2px;
  padding: var(--space-2);
  pointer-events: none;
}

.page-features .hero-bands span {
  flex: 1 1 0;
  height: 5px;
  border-radius: 1px;
  background: var(--color-primary);
}

.page-features .hero-bands span:nth-child(2) { background: var(--color-accent); }
.page-features .hero-bands span:nth-child(3) { background: var(--color-primary); opacity: 0.72; }
.page-features .hero-bands span:nth-child(4) { background: var(--color-accent); opacity: 0.72; }
.page-features .hero-bands span:nth-child(5) { background: var(--color-primary); opacity: 0.46; }
.page-features .hero-bands span:nth-child(6) { background: var(--color-accent); opacity: 0.46; }
.page-features .hero-bands span:nth-child(7) { background: var(--color-contrast-accent); opacity: 0.9; }

.page-features .hero-media .figure-tag {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
  padding: 4px var(--space-2);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  border-radius: var(--radius-sm);
  max-width: 72%;
}

/* ---------- 深底数字条 ---------- */

.page-features .feat-strip {
  background: var(--color-contrast-surface);
  border-block: var(--border-thin) solid var(--color-contrast-line);
}

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

.page-features .strip-grid .data-cell {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-width: 0;
  padding-left: var(--space-3);
  border-left: var(--border-thin) solid var(--color-contrast-line);
}

.page-features .strip-grid .data-label {
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-contrast-ink);
  opacity: 0.7;
}

.page-features .strip-grid .data-value {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-contrast-accent);
}

/* ---------- 筛选条 ---------- */

.page-features .feat-filters {
  padding-block: var(--space-3);
  background: var(--color-surface-alt);
  border-bottom: var(--feat-rule);
}

.page-features .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.page-features .filter-btn {
  appearance: none;
  padding: 6px var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.03em;
  line-height: 1.4;
  cursor: pointer;
  transition: background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}

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

.page-features .filter-btn[aria-pressed="true"] {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-ink);
}

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

.page-features .filter-status {
  margin: var(--space-2) 0 0;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

/* ---------- 模块组 ---------- */

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

.page-features .feat-group {
  padding-block: var(--section-y);
  border-bottom: var(--feat-rule);
}

.page-features .feat-group[hidden] {
  display: none;
}

.page-features .grp-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-3);
  align-items: start;
  padding-bottom: var(--space-3);
  margin-bottom: var(--space-6);
  border-bottom: var(--feat-rule);
}

.page-features .grp-num {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 0.86;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

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

.page-features .grp-note {
  margin: var(--space-1) 0 0;
  max-width: 62ch;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-features .grp-body {
  display: grid;
  gap: var(--space-6);
}

.page-features .grp-list {
  display: grid;
  gap: var(--space-4);
  min-width: 0;
}

/* ---------- 模块卡片 ---------- */

.page-features .mod {
  position: relative;
  min-width: 0;
  padding: var(--space-4);
  background: var(--color-surface);
  border: var(--feat-rule);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-1);
  transition: transform 0.16s ease, border-color 0.16s ease;
}

.page-features .mod:hover {
  transform: translateY(-2px);
  border-color: var(--color-primary);
}

.page-features .mod-top {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

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

.page-features .mod-tag {
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
  padding: 2px 6px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
}

.page-features .mod-cat {
  margin-left: auto;
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
  border-radius: 1px;
  background: var(--color-primary);
  transition: background-color 0.16s ease;
}

.page-features .feat-group[data-cat="b"] .mod-cat { background: var(--color-accent); }
.page-features .feat-group[data-cat="c"] .mod-cat { background: var(--color-primary); opacity: 0.62; }
.page-features .feat-group[data-cat="d"] .mod-cat { background: var(--color-accent); opacity: 0.62; }
.page-features .feat-group[data-cat="e"] .mod-cat { background: var(--color-contrast-surface); }

.page-features .mod:hover .mod-cat {
  background: var(--color-accent);
  opacity: 1;
}

.page-features .mod-title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

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

.page-features .mod-fields {
  margin: var(--space-3) 0 0;
  padding-top: var(--space-2);
  border-top: var(--feat-rule);
  display: grid;
  gap: 3px;
}

.page-features .fld {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-2);
  align-items: baseline;
  padding: 2px 0;
}

.page-features .fld dt {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.02em;
  color: var(--color-ink-muted);
}

.page-features .fld dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-align: right;
  color: var(--color-ink);
}

.page-features .mod-foot {
  margin: var(--space-3) 0 0;
  padding-top: var(--space-2);
  border-top: var(--feat-rule);
  font-size: var(--text-xs);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-features .mod-foot .mono {
  margin-right: var(--space-1);
  color: var(--color-ink-muted);
}

/* ---------- 视觉块 ---------- */

.page-features .grp-visual {
  margin: 0;
  min-width: 0;
}

.page-features .grp-visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 9 / 6;
  object-fit: cover;
  border: var(--feat-rule);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-1);
}

.page-features .grp-cap {
  margin-top: var(--space-2);
  padding-left: var(--space-2);
  border-left: 2px solid var(--color-accent);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.55;
  color: var(--color-ink-muted);
}

/* ---------- 组间深底口径带 ---------- */

.page-features .feat-band {
  background: var(--color-contrast-surface);
  border-block: var(--border-thin) solid var(--color-contrast-line);
  padding-block: var(--space-4);
}

.page-features .feat-band p {
  margin: 0;
  max-width: 96ch;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
}

.page-features .band-key {
  display: block;
  margin-bottom: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-contrast-accent);
}

/* ---------- 口径说明区 ---------- */

.page-features .feat-spec {
  padding-block: var(--section-y-lg);
  background: var(--color-surface-alt);
}

.page-features .spec-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-2) var(--space-3);
  align-items: start;
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-3);
  border-bottom: var(--feat-rule);
}

.page-features .spec-num {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 0.86;
  color: var(--color-accent);
}

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

.page-features .spec-note {
  grid-column: 2;
  margin: var(--space-1) 0 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-features .table-wrap {
  margin-bottom: var(--space-6);
  overflow-x: auto;
  border: var(--feat-rule);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
}

.page-features .data-table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.page-features .data-table caption {
  padding: var(--space-2) var(--space-3);
  text-align: left;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
  border-bottom: var(--feat-rule);
}

.page-features .data-table th,
.page-features .data-table td {
  padding: var(--space-2) var(--space-3);
  text-align: left;
  border-bottom: var(--feat-rule);
  color: var(--color-ink-soft);
}

.page-features .data-table thead th {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
  background: var(--color-surface-alt);
}

.page-features .data-table tbody th {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

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

.page-features .data-table .num {
  font-family: var(--font-mono);
  white-space: nowrap;
  color: var(--color-primary);
}

.page-features .spec-prose {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-features .spec-prose p {
  margin: 0 0 var(--space-3);
}

.page-features .spec-prose p:last-child {
  margin-bottom: 0;
}

.page-features .spec-prose a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-features .spec-prose a:hover {
  color: var(--color-accent);
}

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

/* ---------- 桌面端 ---------- */

@media (min-width: 720px) {
  .page-features .strip-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 1024px) {
  .page-features .hero-grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.18fr);
    gap: var(--space-8);
    align-items: start;
  }

  .page-features .feat-filters {
    position: sticky;
    top: 0;
    z-index: 5;
  }

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

  .page-features .grp-body--split {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-features .grp-body--rev {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.32fr);
    align-items: start;
  }

  .page-features .grp-body--rev .grp-visual {
    grid-column: 1;
    grid-row: 1;
  }

  .page-features .grp-body--rev .grp-list {
    grid-column: 2;
    grid-row: 1;
  }

  .page-features .spec-head {
    gap: var(--space-3) var(--space-4);
  }
}

@media (min-width: 1280px) {
  .page-features .hero-media {
    margin-right: calc(-1 * var(--space-8));
  }

  .page-features .feat-group:nth-of-type(odd) .grp-body--full {
    padding-right: var(--space-8);
  }

  .page-features .feat-group:nth-of-type(even) .grp-body--full {
    padding-left: var(--space-8);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-features .mod,
  .page-features .filter-btn,
  .page-features .mod-cat {
    transition: none;
  }

  .page-features .mod:hover {
    transform: none;
  }
}