.page-about {
  --about-line: rgba(245, 247, 242, 0.12);
  --about-line-soft: rgba(245, 247, 242, 0.06);
  --about-text: rgba(245, 247, 242, 0.76);
  --about-text-dim: rgba(245, 247, 242, 0.62);
  color: var(--paper);
}

.page-about .breadcrumb {
  padding-block: 18px 0;
  font-size: 13px;
  color: var(--muted);
}

.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--signal);
}

.page-about .breadcrumb__sep {
  margin: 0 8px;
  color: var(--neutral);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(22px, 4vw, 40px) clamp(34px, 6vw, 72px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -15% -25% -15% 32%;
  background:
    linear-gradient(115deg, transparent 45%, rgba(198, 255, 0, 0.07) 45.2%, rgba(198, 255, 0, 0.07) 57%, transparent 57.2%),
    linear-gradient(115deg, transparent 63%, rgba(255, 90, 31, 0.12) 63.2%, rgba(255, 90, 31, 0.12) 63.7%, transparent 63.9%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-hero__eyebrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 0;
}

.page-about .about-hero__since {
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--muted);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(33px, 7vw, 72px);
  line-height: 1.04;
  letter-spacing: -0.01em;
  margin: 16px 0 20px;
  color: var(--paper);
}

.page-about .about-hero__lede {
  max-width: 46ch;
  margin: 0 0 14px;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--about-text);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 0;
}

.page-about .about-hero__side {
  display: grid;
  gap: 14px;
}

.page-about .keyfacts {
  list-style: none;
  margin: 0;
  padding: clamp(18px, 3vw, 26px);
  display: grid;
  gap: 16px;
  background: var(--ink-2);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-lg);
  box-shadow: 0 18px 48px -28px rgba(30, 42, 18, 0.9);
}

.page-about .keyfacts__item {
  display: grid;
  gap: 3px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .keyfacts__item:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .keyfacts__num {
  font-size: clamp(26px, 4vw, 36px);
  line-height: 1;
  color: var(--signal);
}

.page-about .keyfacts__label {
  font-size: 14px;
  color: var(--paper);
}

.page-about .keyfacts__desc {
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-hero__note {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin: 0;
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--about-text-dim);
  border-left: 2px solid var(--signal);
  background: rgba(198, 255, 0, 0.05);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.page-about .about-hero__note .status-dot {
  flex: none;
  margin-top: 6px;
}

/* ---------- 章节索引 ---------- */
.page-about .chapter-map {
  border-block: 1px solid var(--about-line);
}

.page-about .chapter-map__list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 14px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .chapter-map__list li {
  flex: none;
}

.page-about .chapter-map__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border-radius: var(--pill);
  border: 1px solid var(--about-line);
  color: var(--paper);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .chapter-map__list a:hover,
.page-about .chapter-map__list a:focus-visible {
  border-color: var(--signal);
  color: var(--signal);
  background: rgba(198, 255, 0, 0.06);
}

.page-about .chapter-map__list .num {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--signal);
}

/* ---------- 通用章节骨架 ---------- */
.page-about .sec {
  padding-block: clamp(34px, 6vw, 84px);
}

.page-about .sec__grid {
  display: grid;
  gap: clamp(18px, 3vw, 40px);
}

.page-about .sec__aside {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .sec__num {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--signal);
}

.page-about .sec__note {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .sec h2 {
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 42px);
  line-height: 1.16;
  margin: 0 0 18px;
  color: var(--paper);
}

.page-about .sec__main > p {
  max-width: 62ch;
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--about-text);
}

.page-about .sec__head {
  display: grid;
  gap: 6px;
  margin-bottom: 16px;
}

.page-about .sec__head h2 {
  margin: 0;
}

.page-about .sec__main a {
  color: var(--signal);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 服务范围 ---------- */
.page-about .scope-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .scope-list__item {
  padding: 18px 20px;
  background: var(--ink-2);
  border-left: 2px solid var(--signal);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.page-about .scope-list__item h3 {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .scope-list__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-text);
}

.page-about .media-frame {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink-2);
  border: 1px solid var(--about-line-soft);
}

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

.page-about .media-frame__caption {
  padding: 10px 16px 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .scope-figure {
  margin-top: 26px;
}

/* ---------- 时间线 ---------- */
.page-about .sec--timeline {
  background: linear-gradient(180deg, rgba(43, 43, 43, 0.45), transparent 70%);
}

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 22px 0 0;
  padding: 0 0 0 28px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--signal), rgba(198, 255, 0, 0.12));
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(22px, 3vw, 34px);
}

.page-about .timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .timeline__dot {
  position: absolute;
  left: -28px;
  top: 5px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--signal);
  box-shadow: 0 0 0 4px rgba(198, 255, 0, 0.08);
}

.page-about .timeline__year {
  display: block;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--signal);
}

.page-about .timeline__body h3 {
  margin: 4px 0 6px;
  font-size: 18px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .timeline__body p {
  margin: 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-text);
}

.page-about .timeline-figure {
  margin: 0;
}

/* ---------- 团队 ---------- */
.page-about .bars {
  list-style: none;
  margin: 24px 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .bar {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr) 44px;
  align-items: center;
  gap: 12px;
}

.page-about .bar__label {
  font-size: 13px;
  color: var(--muted);
}

.page-about .bar__track {
  display: block;
  height: 12px;
  border-radius: var(--pill);
  background: rgba(245, 247, 242, 0.08);
  overflow: hidden;
}

.page-about .bar__fill {
  display: block;
  height: 100%;
  border-radius: var(--pill);
}

.page-about .bar__fill--edit {
  background: var(--signal);
}

.page-about .bar__fill--tech {
  background: var(--signal-soft);
}

.page-about .bar__fill--cs {
  background: var(--flare);
}

.page-about .bar__num {
  font-size: 15px;
  color: var(--paper);
  text-align: right;
}

.page-about .team-figure {
  margin-top: 24px;
}

.page-about .fold {
  margin: 0 0 12px;
  padding: 14px 18px;
  background: var(--ink-3);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-md);
}

.page-about .fold summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  color: var(--paper);
}

.page-about .fold summary::-webkit-details-marker {
  display: none;
}

.page-about .fold summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  color: var(--signal);
}

.page-about .fold[open] summary::after {
  content: "–";
}

.page-about .fold p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-text);
}

/* ---------- 覆盖范围 ---------- */
.page-about .coverage {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 4vw, 44px);
  background: var(--ink-2);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-lg);
}

.page-about .coverage::before {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -110px;
  width: 380px;
  height: 380px;
  background-image: radial-gradient(circle, rgba(198, 255, 0, 0.3) 1.2px, transparent 1.3px);
  background-size: 18px 18px;
  opacity: 0.55;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(circle at 68% 68%, #000 18%, transparent 72%);
  mask-image: radial-gradient(circle at 68% 68%, #000 18%, transparent 72%);
}

.page-about .coverage__head {
  position: relative;
  display: grid;
  gap: 4px;
}

.page-about .coverage__head h2 {
  font-family: var(--font-display);
  font-size: clamp(23px, 3.4vw, 40px);
  line-height: 1.16;
  margin: 6px 0 14px;
  color: var(--paper);
}

.page-about .coverage__head p {
  max-width: 64ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--about-text);
}

.page-about .coverage__chips {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 22px 0 28px;
  padding: 0;
}

.page-about .coverage__chips .chip {
  padding: 8px 14px;
  border-radius: var(--pill);
  border: 1px solid var(--about-line);
  background: transparent;
  color: var(--paper);
  font-size: 13px;
  line-height: 1.4;
}

.page-about .coverage__chips .chip:nth-child(-n + 2) {
  border-color: rgba(198, 255, 0, 0.5);
  color: var(--signal);
}

.page-about .coverage__stats {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 0;
}

.page-about .coverage__stats .stat {
  padding-top: 10px;
  border-top: 2px solid var(--signal);
}

.page-about .coverage__stats dt {
  margin-bottom: 6px;
  font-size: 12px;
  color: var(--muted);
}

.page-about .coverage__stats dd {
  margin: 0;
  font-size: clamp(19px, 2.6vw, 28px);
  line-height: 1.2;
  color: var(--paper);
}

/* ---------- 合作生态 ---------- */
.page-about .partner-list {
  list-style: none;
  margin: 24px 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .partner-list li {
  padding: 18px;
  background: var(--ink-2);
  border: 1px solid var(--about-line-soft);
  border-radius: var(--radius-md);
}

.page-about .partner-list h3 {
  margin: 0 0 8px;
  font-size: 16px;
  color: var(--signal);
}

.page-about .partner-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-text);
}

/* ---------- 方法 ---------- */
.page-about .method__head {
  display: grid;
  gap: 4px;
  max-width: 68ch;
}

.page-about .method__head h2 {
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 42px);
  line-height: 1.16;
  margin: 6px 0 14px;
  color: var(--paper);
}

.page-about .method__head p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--about-text);
}

.page-about .steps {
  list-style: none;
  margin: 26px 0 26px;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .step {
  padding: 20px;
  background: var(--ink-2);
  border-radius: var(--radius-md);
  border-top: 3px solid var(--signal);
}

.page-about .step__num {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--signal);
}

.page-about .step h3 {
  margin: 8px 0;
  font-size: 18px;
  color: var(--paper);
}

.page-about .step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--about-text);
}

.page-about .method__notes {
  display: grid;
  gap: 0;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding-block: clamp(28px, 4vw, 56px) clamp(44px, 7vw, 96px);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 22px;
  padding: clamp(22px, 4vw, 44px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-line);
  background:
    linear-gradient(118deg, rgba(198, 255, 0, 0.12), rgba(255, 90, 31, 0.12)),
    var(--ink-3);
}

.page-about .about-cta__copy h2 {
  font-family: var(--font-display);
  font-size: clamp(23px, 3.2vw, 36px);
  line-height: 1.2;
  margin: 0 0 12px;
  color: var(--paper);
}

.page-about .about-cta__copy p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-text);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-content: start;
}

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

  .page-about .coverage__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .method__notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }
}

@media (min-width: 900px) {
  .page-about .sec__grid {
    grid-template-columns: minmax(0, 190px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .sec__grid--flip {
    grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
  }

  .page-about .sec__aside {
    flex-direction: column;
    gap: 8px;
    position: sticky;
    top: 92px;
  }

  .page-about .sec__aside--figure {
    position: static;
  }

  .page-about .sec__note {
    transform: rotate(-2deg);
    transform-origin: left bottom;
  }

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

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
    max-width: 320px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr);
    align-items: start;
  }

  .page-about .about-hero__side {
    transform: rotate(-1.4deg);
    transform-origin: top right;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__side {
    transform: none;
  }

  .page-about .sec__note {
    transform: none;
  }
}


另外：请直接给出可上线文案，不要解释。上文已按你的格式要求输出 MAIN_HTML 与 PAGE_CSS 两个标记块，若需要我再补一版更偏“时间线主导”的布局变体，说一声即可。