.page-about {
  --about-cyan-deep: #0A7C88;
  --about-slate: #2A3B55;
  --about-slate-soft: #5A7290;
  --about-cut: 14px;
  --about-mesh: rgba(30, 51, 80, 0.32);
  --about-index-w: 172px;
  position: relative;
  color: var(--text);
  font-family: var(--font-body);
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1400px;
  background-image:
    repeating-linear-gradient(to right, var(--about-mesh) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(to bottom, var(--about-mesh) 0 1px, transparent 1px 72px);
  opacity: 0.5;
  pointer-events: none;
  z-index: 0;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0.25) 55%, transparent 100%);
  mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0.25) 55%, transparent 100%);
}

.page-about .about-crumbbar,
.page-about .about-hero,
.page-about .about-grid,
.page-about .about-break,
.page-about .about-cta {
  position: relative;
  z-index: 1;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbbar {
  padding-top: var(--sp-3);
  padding-bottom: var(--sp-2);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: var(--sp-4) var(--sp-5);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__inner {
  display: grid;
  gap: var(--sp-4);
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    column-gap: var(--sp-6);
    align-items: end;
  }
}

.page-about .about-hero__eyebrow {
  margin: 0 0 var(--sp-2);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 0 0 var(--sp-3);
  font-family: var(--font-display);
  font-size: clamp(34px, 6.2vw, 62px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.012em;
  max-width: 17ch;
}

.page-about .about-hero__lead {
  margin: 0 0 var(--sp-2);
  max-width: 60ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-hero__more {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-hero__marks {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  align-self: end;
}

.page-about .about-hero__marks li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-3);
  background: var(--ink-800);
}

.page-about .about-hero__marks .mono {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__marks em {
  font-style: normal;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 主栅格 ---------- */
.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-4);
  padding-block: var(--sp-5);
}

@media (min-width: 1000px) {
  .page-about .about-grid {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    column-gap: var(--sp-6);
    padding-block: var(--sp-6);
  }
}

.page-about .about-content {
  display: grid;
  gap: var(--sp-6);
  min-width: 0;
}

/* ---------- 左侧索引 ---------- */
.page-about .about-index {
  display: none;
}

@media (min-width: 1000px) {
  .page-about .about-index {
    display: block;
    position: sticky;
    top: calc(var(--topbar-h) + 28px);
    align-self: start;
  }
}

.page-about .about-index__title {
  margin: 0 0 var(--sp-3);
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
  border-left: 1px solid var(--line);
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-left: -1px;
  padding: 8px 0 8px 14px;
  border-left: 2px solid transparent;
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-index__link .mono {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--line);
  font-variant-numeric: tabular-nums;
}

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

.page-about .about-index__link:hover .mono,
.page-about .about-index__link:focus-visible .mono {
  color: var(--cyan);
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  scroll-margin-top: calc(var(--topbar-h) + 28px);
}

.page-about .section-head {
  margin-bottom: var(--sp-3);
}

.page-about .section-head__index {
  font-family: var(--font-mono);
  color: var(--cyan);
  letter-spacing: 0.16em;
}

.page-about .section-head__title {
  font-family: var(--font-display);
  font-size: clamp(24px, 3.6vw, 34px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.008em;
  margin: 4px 0 var(--sp-1);
}

.page-about .section-head__note {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .about-prose.prose p {
  margin: 0 0 var(--sp-3);
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
}

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

/* ---------- 01 起点 ---------- */
/* 无额外样式，沿用 about-prose */

/* ---------- 02 服务对象 ---------- */
.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-3);
}

@media (min-width: 760px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-role {
  padding: var(--sp-3);
  position: relative;
}

.page-about .about-role__no {
  margin: 0 0 var(--sp-2);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .about-role__name {
  margin: 0 0 var(--sp-2);
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}

.page-about .about-role__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 03 支持团队 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-4);
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    column-gap: var(--sp-5);
    align-items: center;
  }
}

.page-about .about-team__media {
  margin: 0;
}

.page-about .about-caption {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 04 覆盖与合作 ---------- */
.page-about .about-coverage {
  position: relative;
  margin-inline: calc(-1 * var(--gutter));
  padding: var(--sp-5) var(--gutter);
  overflow: hidden;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--ink-800);
  scroll-margin-top: calc(var(--topbar-h) + 28px);
}

@media (min-width: 1000px) {
  .page-about .about-coverage {
    padding-block: var(--sp-6);
  }
}

.page-about .about-coverage__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.page-about .about-coverage__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.2;
  filter: grayscale(100%) contrast(1.08) brightness(0.75);
}

.page-about .about-coverage__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-coverage__grid {
  display: grid;
  gap: var(--sp-4);
}

@media (min-width: 900px) {
  .page-about .about-coverage__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    column-gap: var(--sp-5);
    align-items: start;
  }
}

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

.page-about .about-figure {
  padding: var(--sp-3);
  background: var(--ink-900);
}

.page-about .about-figure__n {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-figure__label {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .about-coverage__body p {
  margin: 0 0 var(--sp-3);
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--text);
}

.page-about .about-coverage__link {
  display: inline-block;
  margin-top: var(--sp-1);
  padding-bottom: 3px;
  border-bottom: 1px solid currentColor;
  color: var(--cyan-soft);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* ---------- 浅色断点 ---------- */
.page-about .about-break {
  margin-inline: calc(-1 * var(--gutter));
  padding: var(--sp-4) var(--gutter);
  background: var(--paper);
  color: var(--ink-text);
}

.page-about .about-break__inner {
  display: grid;
  gap: var(--sp-2);
  align-items: baseline;
}

@media (min-width: 860px) {
  .page-about .about-break__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    column-gap: var(--sp-5);
    align-items: center;
  }
}

.page-about .about-break__kicker {
  margin: 0 0 var(--sp-1);
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--about-cyan-deep);
  grid-column: 1 / -1;
}

.page-about .about-break__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 800;
  line-height: 1.34;
  letter-spacing: -0.006em;
  color: var(--ink-text);
  max-width: 42ch;
}

.page-about .about-break__link {
  display: inline-block;
  padding-bottom: 3px;
  border-bottom: 1px solid currentColor;
  color: var(--about-cyan-deep);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease;
}

.page-about .about-break__link:hover,
.page-about .about-break__link:focus-visible {
  color: var(--orange);
}

/* ---------- 05 发展历程 ---------- */
.page-about .about-track {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-track__node {
  position: relative;
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: var(--sp-2);
  padding: var(--sp-3) 0 var(--sp-3) var(--sp-3);
  border-left: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

@media (min-width: 760px) {
  .page-about .about-track__node {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: var(--sp-3);
    padding-left: var(--sp-3);
  }
}

.page-about .about-track__node::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 30px;
  width: 9px;
  height: 9px;
  background: var(--ink-900);
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
  transition: background 0.2s ease, border-color 0.2s ease;
}

.page-about .about-track__node:hover::before,
.page-about .about-track__node:focus-within::before {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-track__node--now {
  border-left-color: var(--orange);
}

.page-about .about-track__node--now::before {
  background: var(--orange);
  border-color: var(--orange);
}

.page-about .about-track__stage {
  margin: 4px 0 0;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.page-about .about-track__node--now .about-track__stage {
  color: var(--orange);
}

.page-about .about-track__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}

.page-about .about-track__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-timeline__media {
  margin: var(--sp-4) 0 0;
  max-width: 720px;
}

/* ---------- 06 运营标准 ---------- */
.page-about .about-standards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-3);
}

@media (min-width: 760px) {
  .page-about .about-standards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-standard {
  padding: var(--sp-3);
}

.page-about .about-standard__name {
  margin: 0 0 var(--sp-2);
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--cyan-soft);
}

.page-about .about-standard p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 尾部 CTA ---------- */
.page-about .about-cta {
  border-top: 1px solid var(--line);
  padding-block: var(--sp-5);
  background:
    radial-gradient(120% 140% at 0% 0%, rgba(47, 217, 232, 0.08), transparent 58%),
    var(--ink-800);
}

@media (min-width: 1000px) {
  .page-about .about-cta {
    padding-block: var(--sp-6);
  }
}

.page-about .about-cta__inner {
  display: grid;
  gap: var(--sp-3);
}

@media (min-width: 860px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.45fr) auto;
    column-gap: var(--sp-5);
    align-items: center;
  }
}

.page-about .about-cta h2 {
  margin: 0 0 var(--sp-2);
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.008em;
}

.page-about .about-cta p {
  margin: 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
}

/* ---------- 无障碍与降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-coverage__link,
  .page-about .about-break__link,
  .page-about .about-track__node::before {
    transition: none;
  }
}

.page-about .about-index__link:focus-visible,
.page-about .about-coverage__link:focus-visible,
.page-about .about-break__link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 2px;
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}
<<<END>>>