.page-features {
  background: var(--color-surface);
  color: var(--color-ink);
  overflow-x: clip;
}

.page-features .breadcrumb {
  padding-block: var(--space-4) var(--space-2);
}

/* ---------- Hero ---------- */
.page-features .feat-hero {
  padding-block: 0 var(--section-y);
}

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

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

.page-features .feat-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: 0.92;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  word-break: break-word;
}

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

/* ---------- Dark data band ---------- */
.page-features .feat-data {
  position: relative;
  overflow: hidden;
  padding: var(--space-4);
  border-radius: calc(var(--space-4) * 1);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  box-shadow: var(--shadow-2);
}

.page-features .feat-data::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(
    130% 90% at 100% 0%,
    color-mix(in srgb, var(--color-primary) 44%, transparent),
    transparent 62%
  );
}

.page-features .feat-data::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.32;
  background-image: repeating-linear-gradient(
    0deg,
    color-mix(in srgb, var(--color-contrast-line) 60%, transparent) 0 1px,
    transparent 1px 12px
  );
}

.page-features .feat-data-note {
  position: relative;
  z-index: 1;
  margin: 0 0 var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-contrast-accent);
}

.page-features .feat-data-list {
  position: relative;
  z-index: 1;
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--space-3);
}

.page-features .feat-data-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  column-gap: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px dotted var(--color-contrast-line);
}

.page-features .feat-data-item:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-features .feat-data-num {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: 0.01em;
  font-variant-numeric: tabular-nums;
  color: var(--color-contrast-accent);
}

.page-features .feat-data-text {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.page-features .feat-data-label {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  color: var(--color-contrast-ink);
}

.page-features .feat-data-desc {
  font-size: var(--text-xs);
  line-height: 1.5;
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
}

/* ---------- Group index rail ---------- */
.page-features .feat-toc-wrap {
  margin-top: var(--space-6);
}

.page-features .feat-toc {
  display: flex;
  gap: var(--space-2);
  margin: 0;
  padding: 0 0 var(--space-1);
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-features .feat-toc-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 var(--space-3);
  border-radius: var(--radius-pill);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.02em;
  text-decoration: none;
  white-space: nowrap;
  transition: background 160ms ease, color 160ms ease;
}

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

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

.page-features .feat-filter {
  margin-top: var(--space-3);
}

/* ---------- Group scaffold ---------- */
.page-features .feat-group {
  padding-block: var(--section-y);
}

.page-features .feat-group-top {
  display: grid;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.page-features .feat-group-top-plain {
  margin-top: var(--space-6);
}

.page-features .feat-group-head {
  display: grid;
  gap: var(--space-2);
  align-content: end;
  min-width: 0;
}

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

.page-features .feat-group-head p {
  margin: 0;
  color: var(--color-ink-soft);
}

/* ---------- Media frames ---------- */
.page-features .media-frame {
  position: relative;
  overflow: hidden;
  border-radius: calc(var(--space-3));
  background: var(--color-contrast-surface);
}

.page-features .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.5) contrast(1.06);
}

.page-features .media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(
    142deg,
    color-mix(in srgb, var(--color-primary) 34%, transparent),
    color-mix(in srgb, var(--color-accent) 22%, transparent)
  );
}

.page-features .media-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.02em;
  color: var(--color-contrast-ink);
  background: var(--overlay-scrim);
}

.page-features .feat-media-3x2 img { aspect-ratio: 3 / 2; }
.page-features .feat-media-16x9 img { aspect-ratio: 16 / 9; }
.page-features .feat-media-3x4 img { aspect-ratio: 3 / 4; }
.page-features .feat-media-8x5 img { aspect-ratio: 8 / 5; }

.page-features .feat-media-wide {
  margin: 0 0 var(--space-6);
}

/* ---------- Module matrix ---------- */
.page-features .feat-mods {
  display: grid;
  gap: var(--space-6);
}

.page-features .feat-mod {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas:
    "rail"
    "body";
  gap: var(--space-2);
  padding-left: var(--space-3);
  border-left: var(--border-thick) solid color-mix(in srgb, var(--color-primary) 40%, transparent);
  transition: border-color 160ms ease;
}

.page-features .feat-mod:hover,
.page-features .feat-mod:focus-within {
  border-left-color: var(--color-accent);
}

.page-features .feat-mod-rail {
  grid-area: rail;
}

.page-features .feat-mod-body {
  grid-area: body;
  display: grid;
  gap: var(--space-2);
  min-width: 0;
}

.page-features .feat-mod-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-3);
}

.page-features .feat-mod-title {
  margin: 0;
  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 .feat-mod-status {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 var(--space-2);
  border-radius: var(--radius-pill);
  background: var(--color-surface-deep);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.02em;
}

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

.page-features .feat-mod-fields {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.7;
  letter-spacing: 0.01em;
  color: var(--color-ink-muted);
}

/* ---------- Fold ---------- */
.page-features .fold {
  margin-top: var(--space-1);
}

.page-features .fold-trigger {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  min-height: 44px;
  padding: 0 var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: border-color 160ms ease, background 160ms ease;
}

.page-features .fold-trigger:hover {
  border-color: var(--color-primary);
}

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

.page-features .fold-body {
  margin-top: var(--space-2);
  padding: var(--space-3);
  border-radius: calc(var(--space-2));
  background: var(--color-surface-deep);
}

.page-features .feat-field-list {
  display: grid;
  gap: var(--space-2);
  margin: 0;
}

.page-features .feat-field-list > div {
  display: grid;
  gap: var(--space-1);
  padding-top: var(--space-2);
  border-top: 1px dotted var(--color-line);
}

.page-features .feat-field-list > div:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-features .feat-field-list dt {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.02em;
  color: var(--color-primary);
}

.page-features .feat-field-list dd {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.65;
  color: var(--color-ink-soft);
}

/* ---------- Section separator ---------- */
.page-features .feat-sep {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.page-features .feat-sep::before {
  content: "";
  flex: 0 0 auto;
  width: 64px;
  height: 6px;
  background: var(--color-contrast-surface);
}

.page-features .feat-sep::after {
  content: "";
  flex: 1 1 auto;
  border-top: 1px dotted var(--color-line);
}

/* ---------- Field panel ---------- */
.page-features .feat-fields {
  padding-block: var(--section-y-lg);
  background: var(--color-surface-alt);
}

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

.page-features .feat-fields-copy {
  display: grid;
  gap: var(--space-3);
  align-content: start;
  min-width: 0;
}

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

.page-features .feat-fields-copy p {
  margin: 0;
  color: var(--color-ink-soft);
  line-height: var(--leading-body);
}

.page-features .feat-scale {
  display: block;
  width: 100%;
  height: auto;
}

.page-features .feat-scale-line {
  fill: var(--color-line);
}

.page-features .feat-scale-tick {
  fill: var(--color-primary);
}

.page-features .feat-scale-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  fill: var(--color-ink-muted);
}

.page-features .feat-table-scroll {
  overflow-x: auto;
}

.page-features .feat-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.page-features .feat-table caption {
  padding-bottom: var(--space-2);
  text-align: left;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.03em;
  color: var(--color-ink-muted);
}

.page-features .feat-table th,
.page-features .feat-table td {
  padding: var(--space-2) var(--space-3);
  text-align: left;
  vertical-align: top;
  line-height: 1.6;
}

.page-features .feat-table thead th {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.03em;
}

.page-features .feat-table tbody th {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  color: var(--color-primary);
  white-space: nowrap;
}

.page-features .feat-table tbody tr:nth-child(even) {
  background: var(--color-surface-deep);
}

.page-features .feat-table tbody td {
  color: var(--color-ink-soft);
}

.page-features .feat-fields-media {
  align-self: start;
}

/* ---------- Limits ---------- */
.page-features .feat-limits {
  padding-block: var(--section-y-lg);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-features .index-tag-light {
  background: color-mix(in srgb, var(--color-contrast-accent) 22%, transparent);
  color: var(--color-contrast-accent);
}

.page-features .feat-limits-head {
  display: grid;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.page-features .feat-limits-head h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}

.page-features .feat-limits-head p {
  margin: 0;
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}

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

.page-features .feat-limits-col h3 {
  margin: 0 0 var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: 1px dotted var(--color-contrast-line);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.04em;
  color: var(--color-contrast-accent);
}

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

.page-features .feat-limits-list li {
  padding-left: var(--space-3);
  border-left: 2px solid var(--color-contrast-line);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
}

.page-features .feat-limits-key {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.03em;
  color: var(--color-contrast-ink);
}

.page-features .feat-limits-note {
  margin: var(--space-4) 0 0;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
}

.page-features .feat-limits-note a,
.page-features .feat-mod-desc a,
.page-features .feat-fields-copy a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 3px;
}

.page-features .feat-limits-note a {
  color: var(--color-contrast-accent);
}

.page-features .feat-limits-note a:focus-visible,
.page-features .feat-mod-desc a:focus-visible,
.page-features .feat-fields-copy a:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- Responsive ---------- */
@media (min-width: 640px) {
  .page-features .feat-data-num {
    font-size: var(--text-4xl);
  }

  .page-features .feat-field-list > div {
    grid-template-columns: minmax(0, 20ch) minmax(0, 1fr);
    column-gap: var(--space-3);
    align-items: start;
  }

  .page-features .feat-mod {
    grid-template-columns: 76px minmax(0, 1fr);
    grid-template-areas: "rail body";
    column-gap: var(--space-3);
  }

  .page-features .feat-mod-rail {
    text-align: right;
  }
}

@media (min-width: 900px) {
  .page-features .feat-hero-grid {
    grid-template-columns: 7fr 5fr;
    gap: var(--space-8);
  }

  .page-features .feat-data {
    padding: var(--space-4) var(--space-4) var(--space-6);
  }

  .page-features .feat-group-top {
    grid-template-columns: 7fr 5fr;
    gap: var(--gutter);
  }

  .page-features .feat-group-top.is-reversed {
    grid-template-columns: 4fr 8fr;
  }

  .page-features .feat-group-top.is-reversed .feat-group-media {
    grid-column: 1;
    grid-row: 1;
  }

  .page-features .feat-group-top.is-reversed .feat-group-head {
    grid-column: 2;
    grid-row: 1;
  }

  .page-features .feat-group-top-plain {
    grid-template-columns: 8fr 4fr;
  }

  .page-features .feat-mods {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: var(--gutter);
    row-gap: var(--space-8);
  }

  .page-features .feat-mod {
    grid-template-columns: 64px minmax(0, 1fr);
  }

  .page-features .feat-mod:nth-child(4n + 1) { grid-column: span 7; }
  .page-features .feat-mod:nth-child(4n + 2) { grid-column: span 5; }
  .page-features .feat-mod:nth-child(4n + 3) { grid-column: span 5; }
  .page-features .feat-mod:nth-child(4n + 4) { grid-column: span 7; }

  .page-features .feat-fields-grid {
    grid-template-columns: 7fr 5fr;
    gap: var(--gutter);
  }

  .page-features .feat-limits-grid {
    grid-template-columns: 7fr 5fr;
    gap: var(--gutter);
  }

  .page-features .feat-limits-grid .feat-limits-col:last-child {
    padding-left: var(--space-4);
    border-left: 1px dotted var(--color-contrast-line);
  }
}

@media (min-width: 1100px) {
  .page-features .feat-data-note {
    font-size: var(--text-sm);
  }

  .page-features .feat-data-desc {
    font-size: var(--text-sm);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-features .feat-mod,
  .page-features .fold-trigger,
  .page-features .feat-toc-link {
    transition: none;
  }
}
</main>