.page-platform {
  --pl-hair: var(--border-thin) solid var(--color-line);
  --pl-dot: var(--border-thin) dotted var(--color-line);
  position: relative;
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  overflow-x: hidden;
}

.page-platform .container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.page-platform .pl-section {
  padding-block: var(--space-8);
}

.page-platform .pl-section--band {
  background: var(--color-surface-alt);
  border-block: var(--border-thin) solid var(--color-line);
}

.page-platform a {
  color: inherit;
}

.page-platform .pl-anchor {
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: var(--border-thin) dotted var(--color-accent);
  transition: border-bottom-style 140ms ease-out, color 140ms ease-out;
}

.page-platform .pl-anchor:hover {
  border-bottom-style: solid;
  color: var(--color-accent);
}

/* ---------- 印刷标签 ---------- */
.page-platform .pl-kicker {
  display: inline-block;
  margin: 0 0 var(--space-3);
  padding: 4px 10px 3px;
  border-top: var(--border-thin) solid var(--color-primary);
  border-bottom: var(--border-thin) solid var(--color-primary);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-primary);
}

.page-platform .pl-h2 {
  margin: 0 0 var(--space-3);
  max-width: 26ch;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-3xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-platform .pl-section__lede {
  max-width: var(--measure);
  margin: 0 0 var(--space-6);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 首屏 ---------- */
.page-platform .pl-hero {
  position: relative;
  overflow: hidden;
  padding-block: var(--space-6) var(--space-8);
  border-bottom: var(--border-thin) solid var(--color-line);
  background: var(--color-surface);
}

.page-platform .pl-hero__slash {
  position: absolute;
  top: 0;
  right: 0;
  width: min(58%, 560px);
  height: 100%;
  background: var(--color-surface-alt);
  clip-path: polygon(26% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-platform .pl-hero > .container {
  position: relative;
  z-index: 1;
}

.page-platform .pl-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  margin-bottom: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.page-platform .pl-crumb a {
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: var(--border-thin) dotted var(--color-line);
}

.page-platform .pl-crumb a:hover {
  color: var(--color-primary);
  border-bottom-style: solid;
}

.page-platform .pl-hero__title {
  margin: 0 0 var(--space-4);
  max-width: 15ch;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: var(--text-display);
  line-height: 1.03;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  overflow-wrap: break-word;
}

.page-platform .pl-hero__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  margin-bottom: var(--space-6);
}

.page-platform .pl-hero__main,
.page-platform .pl-hero__aside {
  min-width: 0;
}

.page-platform .pl-lede {
  max-width: var(--measure);
  margin: 0 0 var(--space-3);
  font-size: var(--text-lg);
  line-height: 1.72;
  color: var(--color-ink-soft);
}

.page-platform .pl-hero__hint {
  max-width: var(--measure);
  margin: 0;
  padding-left: var(--space-3);
  border-left: var(--border-thick) solid var(--color-primary);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-muted);
}

/* ---------- 数字刻度带 ---------- */
.page-platform .pl-scale {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4) var(--space-3);
  margin: 0;
  padding: 0 0 var(--space-3);
  list-style: none;
  border-bottom: var(--border-thick) solid var(--color-primary);
}

.page-platform .pl-scale__item {
  position: relative;
  min-width: 0;
  padding-top: var(--space-3);
}

.page-platform .pl-scale__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 8px;
  height: var(--border-thick);
  background: var(--color-primary);
}

.page-platform .pl-scale__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: var(--text-figure);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}

.page-platform .pl-scale__label {
  display: block;
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}

/* ---------- 旁注 ---------- */
.page-platform .pl-note {
  margin: 0 0 var(--space-4);
  padding-left: var(--space-3);
  border-left: var(--border-thick) solid var(--color-primary);
}

.page-platform .pl-note__label {
  margin: 0 0 var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-primary);
}

.page-platform .pl-note__text {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.72;
  color: var(--color-ink-soft);
}

/* ---------- 展签式图片 ---------- */
.page-platform .pl-figure {
  margin: 0;
}

.page-platform .pl-figure__frame {
  overflow: hidden;
  border-top: var(--border-thick) solid var(--color-primary);
  background: var(--color-surface-deep);
}

.page-platform .pl-figure__frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-platform .pl-figure--hero .pl-figure__frame {
  aspect-ratio: 8 / 5;
}

.page-platform .pl-figure--hero .pl-figure__frame img {
  height: 100%;
}

.page-platform .pl-figure--chart .pl-figure__frame {
  aspect-ratio: 14 / 9;
}

.page-platform .pl-figure--chart .pl-figure__frame img {
  height: 100%;
}

.page-platform .pl-figure__cap {
  margin: var(--space-2) 0 0;
  font-size: var(--text-xs);
  line-height: 1.6;
  color: var(--color-ink-muted);
}

.page-platform .pl-figure__no {
  margin-right: var(--space-1);
  font-family: var(--font-mono);
  color: var(--color-primary);
}

/* ---------- 分类过滤 ---------- */
.page-platform .pl-filter {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.page-platform .pl-filter__input {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: 0;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.page-platform .pl-chip {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-1);
  padding: 6px 12px 5px;
  border-top: var(--border-thin) solid var(--color-primary);
  border-bottom: var(--border-thin) solid var(--color-primary);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-soft);
  cursor: pointer;
  transition: background-color 150ms ease-out, color 150ms ease-out;
}

.page-platform .pl-chip:hover {
  background: var(--color-primary-soft);
  color: var(--color-ink);
}

.page-platform .pl-chip__count {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-platform .pl-filter__input:checked + .pl-chip {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border-color: var(--color-primary);
}

.page-platform .pl-filter__input:checked + .pl-chip .pl-chip__count {
  color: var(--color-primary-ink);
}

.page-platform .pl-filter__input:focus-visible + .pl-chip {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- 目录主体 ---------- */
.page-platform .pl-catalog {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

.page-platform .pl-entries {
  min-width: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-platform .pl-entry {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-2);
  padding: var(--space-4) var(--space-2) var(--space-4) var(--space-3);
  border-bottom: var(--pl-dot);
  border-left: var(--pl-dot);
  scroll-margin-top: var(--space-6);
  transition: background-color 150ms ease-out;
}

.page-platform .pl-entry:hover {
  background: var(--color-surface-alt);
}

.page-platform .pl-entry:target {
  background: var(--color-highlight);
}

.page-platform .pl-entry[hidden] {
  display: none;
}

.page-platform .pl-entry__index {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1) var(--space-2);
}

.page-platform .pl-entry__no {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  color: var(--color-ink);
  white-space: nowrap;
}

.page-platform .pl-entry__no::before {
  content: "";
  display: inline-block;
  width: 14px;
  height: var(--border-thick);
  margin-right: var(--space-1);
  vertical-align: middle;
  background: var(--color-primary);
  transition: width 150ms ease-out, background-color 150ms ease-out;
}

.page-platform .pl-entry:hover .pl-entry__no::before,
.page-platform .pl-entry:target .pl-entry__no::before {
  width: 22px;
  background: var(--color-accent);
}

.page-platform .pl-entry__tag {
  padding: 2px 6px 1px;
  border-top: var(--border-thin) solid var(--color-primary);
  border-bottom: var(--border-thin) solid var(--color-primary);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-primary);
  white-space: nowrap;
}

.page-platform .pl-entry__body {
  min-width: 0;
}

.page-platform .pl-entry__title {
  margin: 0 0 var(--space-2);
  max-width: 34ch;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-xl);
  line-height: 1.34;
  color: var(--color-ink);
}

.page-platform .pl-entry__meta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-1) var(--space-3);
  margin: 0;
}

.page-platform .pl-meta {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  min-width: 0;
  font-size: var(--text-sm);
}

.page-platform .pl-meta dt {
  flex: none;
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  border-bottom: var(--border-thin) dotted var(--color-line);
}

.page-platform .pl-meta dd {
  margin: 0;
  color: var(--color-ink-soft);
  overflow-wrap: break-word;
}

.page-platform .pl-state {
  display: inline-block;
  padding: 2px 6px 1px;
  border: var(--border-thin) solid currentColor;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.page-platform .pl-state--done {
  color: var(--color-ink-soft);
}

.page-platform .pl-state--live {
  color: var(--color-accent);
}

.page-platform .pl-state--wait {
  color: var(--color-primary);
}

.page-platform .pl-entry__more {
  margin-top: var(--space-2);
  border-top: var(--pl-dot);
}

.page-platform .pl-entry__more summary {
  padding-top: var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
  cursor: pointer;
  list-style: none;
}

.page-platform .pl-entry__more summary::-webkit-details-marker {
  display: none;
}

.page-platform .pl-entry__more summary::before {
  content: "+";
  display: inline-block;
  width: 1.2em;
  font-family: var(--font-mono);
  color: var(--color-primary);
}

.page-platform .pl-entry__more[open] summary::before {
  content: "–";
}

.page-platform .pl-entry__more summary:hover {
  color: var(--color-ink);
}

.page-platform .pl-entry__panel {
  padding: var(--space-2) 0 var(--space-1) 1.2em;
  font-size: var(--text-sm);
  line-height: 1.72;
  color: var(--color-ink-soft);
}

.page-platform .pl-entry__panel p {
  margin: 0;
}

/* ---------- 右侧旁注栏 ---------- */
.page-platform .pl-rail {
  display: grid;
  gap: var(--space-4);
  min-width: 0;
  align-content: start;
}

/* ---------- 展签条 ---------- */
.page-platform .pl-plate {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

.page-platform .pl-plate__copy {
  min-width: 0;
}

.page-platform .pl-plate__text {
  max-width: var(--measure);
  margin: 0 0 var(--space-3);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-platform .pl-plate__fig {
  min-width: 0;
}

.page-platform .pl-plate__fig .pl-figure__frame {
  aspect-ratio: 8 / 5;
}

.page-platform .pl-plate__fig .pl-figure__frame img {
  height: 100%;
}

/* ---------- 交叉索引 ---------- */
.page-platform .pl-index {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

.page-platform .pl-paths {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: plpath;
}

.page-platform .pl-paths li {
  position: relative;
  counter-increment: plpath;
  padding: var(--space-3) 0 var(--space-3) var(--space-4);
  border-top: var(--pl-dot);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-platform .pl-paths li::before {
  content: counter(plpath, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
}

.page-platform .pl-index__tail {
  margin: var(--space-3) 0 0;
  font-size: var(--text-sm);
  line-height: 1.72;
  color: var(--color-ink-muted);
}

.page-platform .pl-index__map {
  min-width: 0;
}

.page-platform .pl-map {
  display: block;
  width: 100%;
  height: auto;
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface-alt);
}

.page-platform .pl-map__box {
  fill: var(--color-surface);
  stroke: var(--color-line);
  stroke-width: 1;
}

.page-platform .pl-map__box--accent {
  stroke: var(--color-primary);
  stroke-width: 2;
}

.page-platform .pl-map__code {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  fill: var(--color-ink);
}

.page-platform .pl-map__label {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  fill: var(--color-ink-muted);
}

.page-platform .pl-map__link {
  stroke: var(--color-primary);
  stroke-width: 1.5;
}

.page-platform .pl-map__link--accent {
  stroke: var(--color-accent);
  stroke-dasharray: 4 4;
}

.page-platform .pl-map__arrow {
  stroke: var(--color-primary);
  stroke-width: 1.5;
}

.page-platform .pl-map__arrow--accent {
  stroke: var(--color-accent);
}

/* ---------- 下一步 ---------- */
.page-platform .pl-next {
  border-top: var(--border-thin) solid var(--color-line);
}

.page-platform .pl-next__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-platform .pl-next__item {
  border-bottom: var(--pl-dot);
}

.page-platform .pl-next__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-1) var(--space-3);
  padding: var(--space-4) var(--space-2) var(--space-4) var(--space-3);
  border-left: var(--pl-dot);
  text-decoration: none;
  transition: background-color 150ms ease-out;
}

.page-platform .pl-next__link:hover {
  background: var(--color-surface-alt);
}

.page-platform .pl-next__link:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
}

.page-platform .pl-next__no {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-xs);
  color: var(--color-primary);
}

.page-platform .pl-next__name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-xl);
  line-height: 1.3;
  color: var(--color-ink);
  border-bottom: var(--border-thin) dotted var(--color-line);
  justify-self: start;
}

.page-platform .pl-next__link:hover .pl-next__name {
  border-bottom-style: solid;
  color: var(--color-primary);
}

.page-platform .pl-next__desc {
  grid-column: 2;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

.page-platform .pl-next__tail {
  margin: var(--space-4) 0 0;
  font-size: var(--text-sm);
  line-height: 1.72;
  color: var(--color-ink-muted);
}

/* ---------- 过滤状态（无脚本时全部可见） ---------- */
.page-platform:has(#pl-cat-sea:checked) .pl-entry:not([data-cat="sea"]),
.page-platform:has(#pl-cat-clb:checked) .pl-entry:not([data-cat="clb"]),
.page-platform:has(#pl-cat-ven:checked) .pl-entry:not([data-cat="ven"]),
.page-platform:has(#pl-cat-trf:checked) .pl-entry:not([data-cat="trf"]),
.page-platform:has(#pl-cat-fix:checked) .pl-entry:not([data-cat="fix"]),
.page-platform:has(#pl-cat-fld:checked) .pl-entry:not([data-cat="fld"]) {
  display: none;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-platform .pl-entry__meta {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-platform .pl-scale {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--space-4) var(--space-3);
  }

  .page-platform .pl-h2 {
    font-size: var(--text-4xl);
  }
}

@media (min-width: 768px) {
  .page-platform .pl-section {
    padding-block: var(--section-y);
  }

  .page-platform .pl-entry {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: var(--space-2) var(--space-4);
    padding-inline: var(--space-3) var(--space-3);
  }

  .page-platform .pl-entry__index {
    flex-direction: column;
    align-items: flex-start;
  }

  .page-platform .pl-plate {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .page-platform .pl-hero {
    padding-block: var(--space-8) var(--space-8);
  }

  .page-platform .pl-hero__body {
    grid-template-columns: minmax(0, 8fr) minmax(0, 3fr);
    gap: var(--space-8);
    align-items: start;
  }

  .page-platform .pl-catalog {
    grid-template-columns: minmax(0, 8fr) minmax(0, 3fr);
    gap: var(--space-8);
    align-items: start;
  }

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

  .page-platform .pl-index {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: var(--space-8);
    align-items: start;
  }
}

@media (min-width: 1200px) {
  .page-platform .pl-entry {
    grid-template-columns: 200px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-platform * {
    transition-duration: 0.01ms !important;
  }
}