.page-platform {
  --pp-dark: var(--color-contrast-surface);
  --pp-dark-ink: var(--color-contrast-ink);
  --pp-dark-line: var(--color-contrast-line);
  --pp-neon: var(--color-contrast-accent);
  --pp-primary: var(--color-primary);
  --pp-primary-ink: var(--color-primary-ink);
  --pp-accent: var(--color-accent);
  --pp-accent-ink: var(--color-accent-ink);
  --pp-line: var(--color-line);
  --pp-ink: var(--color-ink);
  --pp-ink-soft: var(--color-ink-soft);
  --pp-ink-muted: var(--color-ink-muted);
  color: var(--pp-ink);
}

/* ---------- 首屏 ---------- */
.page-platform .pp-hero {
  position: relative;
  overflow: hidden;
  background: var(--pp-dark);
  color: var(--pp-dark-ink);
  padding-block: var(--space-6) var(--space-8);
}

.page-platform .pp-hero::before {
  content: "";
  position: absolute;
  right: -80px;
  top: -70px;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: var(--pp-accent);
  opacity: 0.16;
  pointer-events: none;
}

.page-platform .pp-hero::after {
  content: "";
  position: absolute;
  left: -70px;
  bottom: -70px;
  width: 240px;
  height: 240px;
  background: var(--pp-neon);
  opacity: 0.14;
  clip-path: polygon(0 0, 100% 0, 0 100%);
  pointer-events: none;
}

.page-platform .pp-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  align-items: center;
}

@media (min-width: 880px) {
  .page-platform .pp-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--space-6);
  }
}

.page-platform .pp-hero__left {
  min-width: 0;
}

.page-platform .pp-crumb {
  margin: 0 0 var(--space-3);
}

.page-platform .pp-crumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

.page-platform .pp-crumb li {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  color: var(--pp-dark-ink);
  opacity: 0.72;
}

.page-platform .pp-crumb li + li::before {
  content: "/";
  color: var(--pp-dark-line);
  opacity: 1;
}

.page-platform .pp-crumb a {
  color: var(--pp-neon);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 180ms ease;
}

.page-platform .pp-crumb a:hover,
.page-platform .pp-crumb a:focus-visible {
  border-bottom-color: var(--pp-neon);
}

.page-platform .pp-hero__eyebrow {
  color: var(--pp-neon);
  letter-spacing: 0.14em;
  margin: 0 0 var(--space-2);
}

.page-platform .pp-hero__h1 {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.02;
  letter-spacing: var(--tracking-heading);
  color: var(--pp-dark-ink);
  text-wrap: balance;
}

.page-platform .pp-hero__lead {
  margin: 0 0 var(--space-4);
  max-width: 46ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--pp-dark-ink);
  opacity: 0.84;
}

.page-platform .pp-hero__big {
  display: inline-flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: var(--border-thin) dashed var(--pp-dark-line);
  border-radius: var(--radius-md);
  background: rgba(29, 226, 204, 0.06);
}

.page-platform .pp-hero__bigtag {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--pp-neon);
}

.page-platform .pp-hero__bignum {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--pp-dark-ink);
  text-shadow: 0 0 26px rgba(29, 226, 204, 0.32);
}

.page-platform .pp-hero__bigunit {
  font-size: var(--text-sm);
  color: var(--pp-dark-ink);
  opacity: 0.72;
}

.page-platform .pp-hero__right {
  min-width: 0;
}

.page-platform .pp-hero__imgwrap {
  position: relative;
  border: var(--border-thick) solid var(--pp-dark-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 8px 8px 0 rgba(29, 226, 204, 0.16);
}

.page-platform .pp-hero__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  opacity: 0.7;
}

.page-platform .pp-hero__plate {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: var(--space-2) var(--space-3);
  background: var(--overlay-scrim);
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
}

.page-platform .pp-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
  margin: var(--space-3) 0 0;
  padding: 0;
}

@media (min-width: 620px) {
  .page-platform .pp-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-platform .pp-stat {
  padding: var(--space-2);
  border: var(--border-thin) solid var(--pp-dark-line);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
}

.page-platform .pp-stat dt {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--pp-neon);
}

.page-platform .pp-stat dd {
  margin: var(--space-1) 0 0;
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--pp-dark-ink);
}

/* ---------- 目录区块 ---------- */
.page-platform .pp-index__lead {
  max-width: var(--measure);
  color: var(--pp-ink-soft);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

.page-platform .pp-tabs {
  margin-top: var(--space-4);
}

.page-platform .pp-tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: 0 0 var(--space-4);
  padding: 0 0 var(--space-3);
  border-bottom: var(--border-thick) solid var(--pp-ink);
}

.page-platform .pp-tab {
  appearance: none;
  border: var(--border-thin) solid var(--pp-line);
  background: var(--color-surface);
  color: var(--pp-ink);
  font-family: inherit;
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background 180ms ease, color 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.page-platform .pp-tab:hover {
  border-color: var(--pp-accent);
  transform: translateY(-2px);
}

.page-platform .pp-tab[aria-selected="true"] {
  background: var(--pp-primary);
  border-color: var(--pp-primary);
  color: var(--pp-primary-ink);
}

.page-platform .pp-tab:focus-visible {
  outline: var(--border-thin) solid var(--color-focus);
  outline-offset: 2px;
}

.page-platform .pp-panel {
  display: block;
}

.page-platform .pp-panel[hidden] {
  display: none;
}

/* ---------- 展签式条目 ---------- */
.page-platform .pp-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 760px) {
  .page-platform .pp-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-3);
  }
}

.page-platform .pp-entry {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-3);
  padding: var(--space-3);
  border: var(--border-thin) solid var(--pp-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: var(--shadow-1);
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.page-platform .pp-entry:nth-child(3n) {
  border-top-right-radius: var(--radius-lg);
  border-bottom-left-radius: var(--radius-lg);
}

.page-platform .pp-entry:nth-child(4n + 2) {
  border-bottom-right-radius: var(--radius-lg);
}

.page-platform .pp-entry:hover {
  transform: translateY(-2px);
  border-color: var(--pp-primary);
  box-shadow: var(--shadow-2);
}

.page-platform .pp-entry__num {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-1);
}

.page-platform .pp-entry__code {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 3px var(--space-1);
  border-radius: var(--radius-sm);
  background: var(--pp-primary);
  color: var(--pp-primary-ink);
  white-space: nowrap;
}

.page-platform .pp-entry__tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--pp-accent);
  border: 1px solid var(--pp-accent);
  border-radius: var(--radius-pill);
  padding: 1px 8px;
  white-space: nowrap;
}

.page-platform .pp-entry__main {
  min-width: 0;
}

.page-platform .pp-entry__title {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  line-height: 1.3;
  color: var(--pp-ink);
}

.page-platform .pp-entry__desc {
  margin: 0 0 var(--space-2);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--pp-ink-soft);
}

.page-platform .pp-entry__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-3);
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.02em;
  color: var(--pp-ink-muted);
}

/* ---------- 图形展板 ---------- */
.page-platform .pp-figure {
  position: relative;
  margin: 0 0 var(--space-4);
  border: var(--border-thick) solid var(--pp-primary);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-2);
  background: var(--color-surface-deep);
}

.page-platform .pp-figure__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-platform .pp-figure__plate {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: var(--space-2) var(--space-3);
  background: var(--overlay-scrim);
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
}

/* ---------- 目录尾注 ---------- */
.page-platform .pp-index__foot {
  margin: var(--space-4) 0 0;
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--pp-line);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--pp-ink-soft);
  max-width: var(--measure);
}

.page-platform .pp-index__foot a {
  color: var(--pp-accent);
  text-decoration: none;
  border-bottom: 2px solid var(--color-highlight);
  transition: border-color 180ms ease, color 180ms ease;
}

.page-platform .pp-index__foot a:hover,
.page-platform .pp-index__foot a:focus-visible {
  color: var(--color-focus);
  border-bottom-color: var(--color-focus);
}

/* ---------- 编号规则 ---------- */
.page-platform .pp-rules {
  background: var(--pp-dark);
  color: var(--pp-dark-ink);
}

.page-platform .pp-rules__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  align-items: start;
}

@media (min-width: 900px) {
  .page-platform .pp-rules__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: var(--space-6);
  }
}

.page-platform .pp-rules__eyebrow {
  color: var(--pp-neon);
  letter-spacing: 0.14em;
  margin: 0 0 var(--space-2);
}

.page-platform .pp-rules__h2 {
  margin: 0 0 var(--space-3);
  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(--pp-dark-ink);
}

.page-platform .pp-rules__lead {
  margin: 0;
  max-width: 44ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--pp-dark-ink);
  opacity: 0.8;
}

.page-platform .pp-rules__list {
  margin: 0;
  display: grid;
  gap: 0;
  border-top: var(--border-thick) solid var(--pp-neon);
}

.page-platform .pp-rules__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-1);
  padding: var(--space-3) 0;
  border-bottom: var(--border-thin) solid var(--pp-dark-line);
}

@media (min-width: 640px) {
  .page-platform .pp-rules__row {
    grid-template-columns: 160px minmax(0, 1fr);
    gap: var(--space-3);
    align-items: baseline;
  }
}

.page-platform .pp-rules__row dt {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--pp-neon);
}

.page-platform .pp-rules__row dd {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--pp-dark-ink);
  opacity: 0.88;
}

.page-platform .pp-rules__row a {
  color: var(--pp-neon);
  text-decoration: none;
  border-bottom: 1px solid var(--pp-dark-line);
  transition: border-color 180ms ease;
}

.page-platform .pp-rules__row a:hover,
.page-platform .pp-rules__row a:focus-visible {
  border-bottom-color: var(--pp-neon);
}

/* ---------- 焦点可见性 ---------- */
.page-platform a:focus-visible,
.page-platform button:focus-visible {
  outline: var(--border-thin) solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- 滚动显现（渐进增强） ---------- */
.page-platform.js .page-platform [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 340ms ease, transform 340ms ease;
}

.page-platform.js .page-platform [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-platform .pp-entry,
  .page-platform .pp-tab,
  .page-platform .pp-crumb a,
  .page-platform .pp-index__foot a,
  .page-platform .pp-rules__row a {
    transition: none;
  }
  .page-platform .pp-entry:hover,
  .page-platform .pp-tab:hover {
    transform: none;
  }
  .page-platform.js .page-platform [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}
</main>