.page-about {
  --about-rail-w: 240px;
  --about-line: 1px solid var(--grid);
  background: var(--void);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.78;
  padding-top: var(--header-h);
  overflow-x: hidden;
}

.page-about .about-crumbs {
  max-width: var(--max);
  margin: 0 auto;
  padding: 20px var(--gutter) 0;
  font-size: var(--fs-small);
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-crumbs .breadcrumbs__link {
  color: var(--muted);
  text-decoration: none;
}

.page-about .about-crumbs .breadcrumbs__link:hover {
  color: var(--cyan);
}

.page-about .about-crumbs .breadcrumbs__item + .breadcrumbs__item::before,
.page-about .about-crumbs .breadcrumbs__link + .breadcrumbs__item::before {
  content: "/";
  margin: 0 0.6em;
  color: var(--grid);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: var(--about-line);
  background:
    radial-gradient(120% 90% at 84% 6%, rgba(255, 61, 190, 0.2), transparent 58%),
    radial-gradient(90% 80% at 98% 64%, rgba(53, 224, 232, 0.18), transparent 62%),
    linear-gradient(180deg, #080d20 0%, var(--void) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(29, 42, 80, 0.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(29, 42, 80, 0.35) 1px, transparent 1px);
  background-size: 96px 96px;
  mask-image: linear-gradient(120deg, rgba(0, 0, 0, 0.9), transparent 70%);
  -webkit-mask-image: linear-gradient(120deg, rgba(0, 0, 0, 0.9), transparent 70%);
  pointer-events: none;
}

.page-about .about-prism {
  position: absolute;
  top: 10%;
  right: -18%;
  width: 74%;
  max-width: 560px;
  aspect-ratio: 1 / 1;
  background: conic-gradient(from 210deg at 50% 50%,
    rgba(53, 224, 232, 0.55),
    rgba(255, 61, 190, 0.45),
    rgba(255, 180, 61, 0.34),
    rgba(53, 224, 232, 0.2),
    rgba(53, 224, 232, 0.55));
  clip-path: polygon(50% 0, 100% 88%, 0 88%);
  filter: blur(3px) saturate(1.25);
  opacity: 0.4;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--max);
  margin: 0 auto;
  padding: var(--sp-md) var(--gutter) var(--sp-md);
}

.page-about .about-hero__kicker {
  margin: 0 0 20px;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 var(--sp-sm);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: var(--fs-d1);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-hero__lead {
  max-width: 34em;
  margin: 0 0 var(--sp-sm);
  color: var(--muted);
  font-size: var(--fs-body);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__aside {
  margin-top: var(--sp-sm);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px;
  background: rgba(12, 19, 48, 0.86);
}

.page-about .about-stat__num {
  font-family: var(--font-num);
  font-weight: 600;
  font-size: 28px;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-stat:nth-child(2n) .about-stat__num {
  color: var(--magenta);
}

.page-about .about-stat:nth-child(3n) .about-stat__num {
  color: var(--amber);
}

.page-about .about-stat__label {
  font-size: var(--fs-small);
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  max-width: var(--max);
  margin: 0 auto;
  padding: var(--sp-md) var(--gutter) var(--sp-lg);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-md);
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.22em;
  color: var(--muted);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--grid);
  color: var(--muted);
  text-decoration: none;
  font-size: var(--fs-small);
  white-space: nowrap;
  transition: border-color 0.26s var(--ease), color 0.26s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--cyan);
  color: var(--text);
}

.page-about .about-rail__num {
  font-family: var(--font-num);
  font-weight: 600;
  color: var(--cyan);
}

.page-about .about-flow {
  display: grid;
  gap: var(--sp-md);
  min-width: 0;
}

/* ---------- 章节基础 ---------- */
.page-about .about-section {
  scroll-margin-top: calc(var(--header-h) + 24px);
  padding-top: 8px;
  border-top: 1px solid var(--grid);
}

.page-about .about-section__head {
  margin-bottom: var(--sp-sm);
}

.page-about .about-section__title {
  margin: 12px 0 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: var(--fs-h2);
  line-height: 1.18;
  color: var(--text);
}

.page-about .about-section__lead {
  max-width: 34em;
  margin: 16px 0 0;
  color: var(--muted);
}

.page-about .about-note {
  margin: var(--sp-sm) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--cyan);
  color: var(--muted);
  font-size: var(--fs-small);
}

.page-about .about-section .link {
  color: var(--cyan);
}

/* ---------- 时间轴 ---------- */
.page-about .iter-wrap {
  display: grid;
  gap: var(--sp-sm);
}

.page-about .iter {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 20px;
}

.page-about .iter::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--magenta), var(--amber), var(--grid));
}

.page-about .iter__item {
  position: relative;
  padding-left: 48px;
  scroll-margin-top: calc(var(--header-h) + 32px);
}

.page-about .iter__node {
  position: absolute;
  left: 0;
  top: 0;
}

.page-about .iter__ver {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--grid);
  background: var(--void);
  font-family: var(--font-num);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  text-decoration: none;
  transition: border-color 0.26s var(--ease), color 0.26s var(--ease);
}

.page-about .iter__item:nth-child(2) .iter__ver {
  color: var(--magenta);
}

.page-about .iter__item:nth-child(3) .iter__ver {
  color: var(--amber);
}

.page-about .iter__item:nth-child(4) .iter__ver {
  color: var(--cyan);
}

.page-about .iter__ver:hover,
.page-about .iter__ver:focus-visible {
  border-color: currentColor;
}

.page-about .iter__body {
  border: 1px solid var(--grid);
  background: var(--panel);
  padding: 18px 20px;
  transition: border-color 0.26s var(--ease), background-color 0.26s var(--ease);
}

.page-about .iter__item:hover .iter__body,
.page-about .iter__item:target .iter__body {
  border-color: var(--cyan);
  background: rgba(53, 224, 232, 0.06);
}

.page-about .iter__item:target .iter__ver {
  border-color: var(--cyan);
  background: rgba(53, 224, 232, 0.14);
}

.page-about .iter__meta {
  margin: 0 0 6px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-about .iter__title {
  margin: 0 0 8px;
  font-size: var(--fs-h4);
  font-weight: 800;
  color: var(--text);
}

.page-about .iter__body p:last-child {
  margin: 0;
  color: var(--muted);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure .figure__caption {
  margin-top: 10px;
  font-size: var(--fs-small);
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: var(--sp-sm);
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .team-card {
  padding: 20px;
  background: var(--panel);
  transition: background-color 0.26s var(--ease);
}

.page-about .team-card:hover {
  background: #101a3c;
}

.page-about .team-card__num {
  margin: 0 0 8px;
  font-family: var(--font-num);
  font-weight: 600;
  font-size: 20px;
  color: var(--magenta);
}

.page-about .team-card__title {
  margin: 0 0 8px;
  font-size: var(--fs-h4);
  font-weight: 800;
  color: var(--text);
}

.page-about .team-card__text {
  margin: 0;
  font-size: 15px;
  color: var(--muted);
}

.page-about .pipeline {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: var(--sp-sm) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .pipeline__step {
  position: relative;
  padding: 8px 14px;
  border: 1px solid var(--grid);
  font-size: var(--fs-small);
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .pipeline__step:last-child {
  border-color: var(--cyan);
  color: var(--cyan);
}

/* ---------- 更新节奏 ---------- */
.page-about .cadence {
  display: grid;
  gap: var(--sp-sm);
}

.page-about .cadence__steps {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .cadence__step {
  padding: 18px 20px;
  border: 1px solid var(--grid);
  border-left: 2px solid var(--amber);
  background: rgba(12, 19, 48, 0.7);
}

.page-about .cadence__key {
  margin: 0 0 4px;
  font-family: var(--font-num);
  font-weight: 600;
  font-size: 20px;
  color: var(--amber);
}

.page-about .cadence__title {
  margin: 0 0 6px;
  font-size: var(--fs-h4);
  font-weight: 800;
  color: var(--text);
}

.page-about .cadence__step p:last-child {
  margin: 0;
  font-size: 15px;
  color: var(--muted);
}

.page-about .cadence__note {
  margin: 16px 0 0;
  font-size: var(--fs-small);
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .cadence__note .t-num {
  font-family: var(--font-num);
  font-weight: 600;
  font-size: 20px;
  color: var(--amber);
}

/* ---------- 覆盖 ---------- */
.page-about .coverage {
  display: grid;
  gap: 20px;
  padding: var(--sp-sm) 24px;
  border: 1px solid var(--grid);
  background:
    linear-gradient(135deg, rgba(53, 224, 232, 0.14), rgba(255, 61, 190, 0.08) 62%, transparent 100%),
    var(--panel);
}

.page-about .coverage__num {
  margin: 0;
  font-family: var(--font-num);
  font-weight: 600;
  font-size: 64px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .coverage__body p {
  margin: 0 0 12px;
  color: var(--muted);
}

.page-about .coverage__body p:first-child {
  color: var(--text);
}

.page-about .coverage__body p:last-child {
  margin-bottom: 0;
}

/* ---------- 协作 ---------- */
.page-about .about-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.page-about .about-filter .filter-chip {
  padding: 8px 16px;
  border: 1px solid var(--grid);
  background: transparent;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: var(--fs-small);
  font-weight: 800;
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: border-color 0.26s var(--ease), color 0.26s var(--ease), background-color 0.26s var(--ease);
}

.page-about .about-filter .filter-chip:hover {
  border-color: var(--magenta);
  color: var(--text);
}

.page-about .about-filter .filter-chip[aria-pressed="true"] {
  border-color: var(--magenta);
  background: rgba(255, 61, 190, 0.16);
  color: var(--text);
}

.page-about .partner-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .partner {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "num label"
    "text text";
  gap: 6px 12px;
  padding: 18px 20px;
  background: var(--panel);
  transition: background-color 0.26s var(--ease);
}

.page-about .partner:hover {
  background: #101a3c;
}

.page-about .partner__num {
  grid-area: num;
  font-family: var(--font-num);
  font-weight: 600;
  font-size: 20px;
  line-height: 1.2;
  color: var(--magenta);
}

.page-about .partner__label {
  grid-area: label;
  align-self: center;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-about .partner__text {
  grid-area: text;
  margin: 0;
  font-size: 15px;
  color: var(--text);
}

/* ---------- 底部入口 ---------- */
.page-about .about-cta {
  border-top: 1px solid var(--grid);
  padding-top: var(--sp-sm);
}

.page-about .about-cta__title {
  margin: 0 0 20px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: var(--fs-h3);
  color: var(--text);
}

.page-about .about-cta__links {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .about-cta__link {
  display: block;
  padding: 18px 20px;
  background: var(--panel);
  text-decoration: none;
  transition: background-color 0.26s var(--ease), box-shadow 0.26s var(--ease);
}

.page-about .about-cta__link:hover,
.page-about .about-cta__link:focus-visible {
  background: rgba(53, 224, 232, 0.08);
  box-shadow: inset 2px 0 0 var(--cyan);
}

.page-about .about-cta__label {
  display: block;
  font-size: var(--fs-h4);
  font-weight: 800;
  color: var(--cyan);
}

.page-about .about-cta__desc {
  display: block;
  margin-top: 6px;
  font-size: var(--fs-small);
  color: var(--muted);
}

/* ---------- 桌面 ---------- */
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .partner-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-cta__links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .cadence {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: var(--gap);
  }

  .page-about .coverage {
    grid-template-columns: auto minmax(0, 7fr);
    align-items: start;
    gap: var(--sp-sm);
    padding: var(--sp-sm) var(--sp-sm);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    display: grid;
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--gap);
    align-items: end;
    padding: var(--sp-lg) var(--gutter) var(--sp-md);
  }

  .page-about .about-hero__aside {
    margin-top: 0;
  }

  .page-about .about-stats {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .iter-wrap {
    grid-template-columns: minmax(0, 8fr) minmax(0, 3fr);
    align-items: start;
    gap: var(--gap);
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .about-rail__list {
    display: grid;
    gap: 2px;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-rail__link {
    display: flex;
    width: 100%;
    border-color: transparent;
    border-left: 1px solid var(--grid);
    padding: 8px 0 8px 14px;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-left-color: var(--cyan);
    color: var(--text);
  }
}
<<<END>>>