.page-about {
  --about-rail: clamp(180px, 15vw, 232px);
  --about-flow-gap: clamp(54px, 8vw, 100px);
  position: relative;
  padding-bottom: calc(var(--dock-h) + 40px);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(16px, 3vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 52px);
  padding-top: clamp(20px, 3.6vw, 46px);
  padding-bottom: clamp(36px, 5vw, 72px);
  align-items: start;
}

@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.32fr) minmax(280px, 0.78fr);
    gap: clamp(36px, 5vw, 80px);
  }
}

.page-about .about-hero__lead {
  position: relative;
  padding: clamp(22px, 3vw, 44px);
  border: 1px solid var(--grid);
  background:
    linear-gradient(158deg, rgba(27, 135, 166, 0.13), rgba(90, 59, 133, 0.06) 52%, rgba(8, 14, 31, 0) 84%),
    var(--ink);
}

.page-about .about-hero__lead::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: clamp(72px, 12vw, 128px);
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--signal));
}

.page-about .about-hero__lead::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 7px;
  background-image: repeating-linear-gradient(90deg, var(--grid) 0 1px, transparent 1px 26px);
  opacity: 0.85;
  pointer-events: none;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(36px, 6vw, 70px);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__intro {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.1vw, 18px);
  line-height: 1.78;
  color: var(--body-text);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

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

.page-about .about-hero__facts > li {
  background: var(--ink-2);
  padding: 14px 16px;
}

.page-about .fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.5vw, 30px);
  line-height: 1.1;
  color: var(--signal);
}

.page-about .fact__label {
  display: block;
  margin-top: 5px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mute);
}

/* 版本标签条 */
.page-about .about-hero__rail {
  border-top: 2px solid var(--cyan);
  padding-top: 18px;
}

.page-about .about-rail__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 2vw, 26px);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-rail__note {
  margin: 10px 0 18px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mute);
  max-width: 34ch;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .ver-item {
  display: grid;
  gap: 3px;
  padding: 12px 15px;
  background: var(--ink-2);
  border: 1px solid var(--grid);
  border-left: 3px solid var(--cyan);
  transition:
    transform var(--t-hover) var(--ease),
    border-color var(--t-hover) var(--ease),
    background-color var(--t-hover) var(--ease);
}

.page-about .ver-item--branch {
  border-left-color: var(--amber);
}

.page-about .ver-item:hover,
.page-about .ver-item:focus-within {
  transform: translateX(4px);
  border-color: var(--cyan);
  background: #122040;
}

.page-about .ver-item__name {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--paper);
}

.page-about .ver-item--branch .ver-item__name {
  color: var(--amber);
}

.page-about .ver-item__desc {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--body-text);
}

.page-about .ver-item__more {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--mute);
  transition:
    max-height 320ms var(--ease),
    opacity var(--t-hover) var(--ease),
    margin-top var(--t-hover) var(--ease);
}

.page-about .ver-item:hover .ver-item__more,
.page-about .ver-item:focus-within .ver-item__more {
  max-height: 110px;
  opacity: 1;
  margin-top: 4px;
}

@media (hover: none) {
  .page-about .ver-item__more {
    max-height: none;
    opacity: 1;
    margin-top: 4px;
  }
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 44px);
  padding-bottom: clamp(24px, 4vw, 48px);
}

@media (min-width: 1080px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 80px);
    align-items: start;
  }
}

/* 章节导航 */
.page-about .about-toc {
  min-width: 0;
}

@media (min-width: 1080px) {
  .page-about .about-toc {
    position: sticky;
    top: calc(var(--head-h) + 22px);
    align-self: start;
    border-left: 1px solid var(--grid);
    padding-left: 14px;
  }
}

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

@media (min-width: 1080px) {
  .page-about .about-toc__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }
}

.page-about .about-toc__link {
  display: block;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--mute);
  text-decoration: none;
  white-space: nowrap;
  border-left: 2px solid transparent;
  transition:
    color var(--t-hover) var(--ease),
    background-color var(--t-hover) var(--ease),
    border-color var(--t-hover) var(--ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--paper);
  background: var(--ink-2);
  border-left-color: var(--amber);
}

/* ---------- 章节通用 ---------- */
.page-about .about-flow {
  display: grid;
  gap: var(--about-flow-gap);
  min-width: 0;
}

.page-about .about-section {
  scroll-margin-top: calc(var(--head-h) + 28px);
  min-width: 0;
}

.page-about .about-section h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.4vw, 42px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-section h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(18px, 1.7vw, 22px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-section p {
  margin: 18px 0 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--body-text);
}

.page-about .about-section a {
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 240, 180, 0.4);
  transition: border-color var(--t-hover) var(--ease), color var(--t-hover) var(--ease);
}

.page-about .about-section a:hover,
.page-about .about-section a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(26px, 3vw, 40px);
  width: 100%;
}

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

.page-about .about-figure--band img {
  aspect-ratio: 16 / 5;
}

.page-about .about-figure--wide img {
  aspect-ratio: 5 / 2;
}

.page-about .about-figure--side img {
  aspect-ratio: 4 / 3;
}

/* ---------- 版本分区：左右并置 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 40px);
  align-items: start;
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.1fr) minmax(260px, 0.72fr);
  }
  .page-about .about-split .about-figure {
    margin-bottom: 0;
    position: sticky;
    top: calc(var(--head-h) + 28px);
  }
}

.page-about .about-split__text p:first-child {
  margin-top: 18px;
}

/* ---------- 数据链路：四宫格 ---------- */
.page-about .about-teams {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

@media (min-width: 720px) {
  .page-about .about-teams {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-team {
  position: relative;
  background: var(--ink);
  padding: clamp(20px, 2.4vw, 30px);
  transition:
    background-color var(--t-hover) var(--ease),
    box-shadow var(--t-hover) var(--ease);
}

.page-about .about-team:hover,
.page-about .about-team:focus-within {
  background: var(--ink-2);
  box-shadow: inset 3px 0 0 var(--signal);
}

.page-about .about-team__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-team h3 {
  margin-top: 10px;
}

.page-about .about-team p {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--body-text);
  max-width: 42ch;
}

.page-about .about-team__meta {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--mute);
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-coverage__stats {
  margin-top: 28px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

@media (min-width: 700px) {
  .page-about .about-coverage__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-coverage__stats .kpi {
  background: var(--ink-2);
  padding: clamp(16px, 2vw, 24px);
}

.page-about .about-coverage__body {
  margin-top: clamp(26px, 3.4vw, 44px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 44px);
  align-items: start;
}

@media (min-width: 860px) {
  .page-about .about-coverage__body {
    grid-template-columns: minmax(0, 1fr) minmax(220px, 300px);
  }
}

.page-about .about-coverage__text p:first-child {
  margin-top: 0;
}

.page-about .about-matrix {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 5px;
  width: 100%;
  max-width: 320px;
  padding: 12px;
  border: 1px solid var(--grid);
  background:
    repeating-linear-gradient(0deg, rgba(30, 42, 70, 0.5) 0 1px, transparent 1px 26px),
    rgba(15, 24, 48, 0.6);
}

.page-about .about-matrix span {
  aspect-ratio: 1 / 1;
  background: rgba(53, 240, 180, 0.14);
  border: 1px solid rgba(53, 240, 180, 0.32);
}

.page-about .about-matrix span:nth-child(n + 27) {
  background: rgba(90, 59, 133, 0.55);
  border-color: rgba(90, 59, 133, 0.95);
}

/* ---------- 发展阶段：时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 32px 0 0;
  padding: 0 0 0 24px;
  border-left: 1px solid var(--grid);
  display: grid;
  gap: 30px;
}

.page-about .about-timeline__item {
  position: relative;
  min-width: 0;
}

.page-about .about-timeline__dot {
  position: absolute;
  left: -29px;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(27, 135, 166, 0.18);
}

.page-about .about-timeline__item:nth-child(2n) .about-timeline__dot {
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 139, 61, 0.16);
}

.page-about .about-timeline__item p {
  margin-top: 10px;
  font-size: 15.5px;
  line-height: 1.74;
  color: var(--body-text);
  max-width: 46ch;
}

@media (min-width: 900px) {
  .page-about .about-timeline {
    grid-auto-flow: column;
    grid-auto-columns: minmax(0, 1fr);
    padding: 34px 0 0;
    border-left: 0;
    border-top: 1px solid var(--grid);
    gap: clamp(18px, 2.2vw, 32px);
  }
  .page-about .about-timeline__dot {
    left: 0;
    top: -39px;
  }
  .page-about .about-timeline__item p {
    max-width: none;
  }
}

/* ---------- 开始使用 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

@media (min-width: 820px) {
  .page-about .about-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-step {
  background: var(--ink);
  padding: clamp(20px, 2.4vw, 28px);
  transition: background-color var(--t-hover) var(--ease);
}

.page-about .about-step:hover {
  background: var(--ink-2);
}

.page-about .about-step__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-step h3 {
  margin-top: 14px;
  font-size: clamp(17px, 1.6vw, 20px);
}

.page-about .about-step p {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.72;
  max-width: none;
}

.page-about .about-contact {
  margin-top: clamp(24px, 3vw, 36px);
  padding: clamp(18px, 2.2vw, 26px);
  border-left: 3px solid var(--amber);
  background: linear-gradient(90deg, rgba(255, 139, 61, 0.09), rgba(8, 14, 31, 0) 78%);
}

.page-about .about-contact p {
  margin-top: 0;
  font-size: 15.5px;
  color: var(--body-text);
  max-width: 66ch;
}

@media (max-width: 600px) {
  .page-about .about-hero__lead {
    padding: 20px 16px 22px;
  }
  .page-about .about-matrix {
    max-width: 100%;
  }
}
<<<END>>>