.page-about {
  --tl-col: 52px;
  --tl-gap: 20px;
  --about-gap: clamp(20px, 3vw, 36px);
  padding-top: clamp(18px, 3vw, 32px);
  padding-bottom: clamp(52px, 8vw, 104px);
}

@media (min-width: 720px) {
  .page-about {
    --tl-col: 78px;
    --tl-gap: 36px;
  }
}

.page-about .crumbs {
  margin-bottom: clamp(18px, 3vw, 30px);
}

/* ---------- 首屏 ---------- */

.page-about .about-cover {
  position: relative;
  display: grid;
  gap: var(--about-gap);
  padding: clamp(20px, 4vw, 44px);
  overflow: hidden;
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(62, 242, 210, 0.1), transparent 55%),
    var(--c-cabin);
  border: 1px solid var(--c-line);
  border-radius: var(--r-lg);
}

.page-about .about-cover::after {
  content: "";
  position: absolute;
  right: -40px;
  bottom: -60px;
  width: 220px;
  height: 220px;
  border: 1px dashed var(--c-line);
  border-radius: 50%;
  pointer-events: none;
}

@media (min-width: 900px) {
  .page-about .about-cover {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 54px);
    padding: clamp(32px, 4vw, 56px);
  }
}

.page-about .about-cover__rail {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-left: 14px;
  border-left: 2px solid var(--c-cyan);
}

.page-about .about-cover__span {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 19px;
  letter-spacing: 0.04em;
  color: var(--c-white);
}

.page-about .about-cover__railnote {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--c-slate);
}

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

.page-about .about-cover__title {
  margin: 0 0 0.45em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 6.4vw, 58px);
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--c-white);
}

.page-about .about-cover__lead {
  margin: 0;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-paper);
}

.page-about .about-cover__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
  margin: clamp(22px, 3.4vw, 32px) 0 0;
  padding-top: clamp(18px, 3vw, 26px);
  border-top: 1px solid var(--c-line);
}

@media (min-width: 720px) {
  .page-about .about-cover__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-stat {
  min-width: 0;
}

.page-about .about-stat dt {
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-slate);
}

.page-about .about-stat dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(16px, 2.2vw, 21px);
  letter-spacing: 0.03em;
  color: var(--c-white);
}

.page-about .about-stat--ver dd {
  color: var(--c-amber);
}

/* ---------- 章节通用 ---------- */

.page-about .about-sec,
.page-about .about-next {
  margin-top: clamp(52px, 8vw, 104px);
}

.page-about .about-body {
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .rules,
.page-about .start-list,
.page-about .team-pillars,
.page-about .reach-grid,
.page-about .next-list,
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

/* ---------- 起点 ---------- */

.page-about .about-cols {
  display: grid;
  gap: clamp(22px, 3.4vw, 44px);
}

@media (min-width: 900px) {
  .page-about .about-cols {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }
}

.page-about .about-cols__text p {
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-paper);
}

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

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

.page-about .start-list li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 15px 18px;
  background: var(--c-cabin);
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-paper);
  transition: border-color 0.22s var(--ease);
}

.page-about .start-list li:hover {
  border-color: var(--c-green);
}

.page-about .start-list__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-green);
  padding-top: 2px;
}

/* ---------- 四条做法 ---------- */

.page-about .rules {
  display: grid;
  gap: 16px;
}

@media (min-width: 680px) {
  .page-about .rules {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

.page-about .rule {
  padding: 22px 22px 20px;
  background: linear-gradient(180deg, rgba(16, 30, 63, 0.92), rgba(10, 22, 51, 0.92));
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-cyan);
  border-radius: var(--r-md);
  transition: border-left-color 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .rule:hover {
  border-left-color: var(--c-orange);
  transform: translateX(3px);
}

.page-about .rule__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-orange);
}

.page-about .rule__title {
  margin: 10px 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 21px;
  line-height: 1.25;
  color: var(--c-white);
}

.page-about .rule__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--c-paper);
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

@media (min-width: 1000px) {
  .page-about .about-timeline {
    grid-template-columns: minmax(240px, 330px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-timeline__figure {
    position: sticky;
    top: 28px;
  }
}

.page-about .timeline {
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 12px;
  bottom: 26px;
  left: calc(var(--tl-col) + var(--tl-gap) / 2 - 1px);
  border-left: 2px dashed var(--c-line);
}

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: var(--tl-col) minmax(0, 1fr);
  column-gap: var(--tl-gap);
  padding-bottom: clamp(26px, 3.4vw, 40px);
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  top: 7px;
  left: calc(var(--tl-col) + var(--tl-gap) / 2 - 7px);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--c-deep);
  border: 2px solid var(--c-cyan);
  transition: background-color 0.2s var(--ease);
}

.page-about .tl-item:hover::before {
  background: var(--c-cyan);
}

.page-about .tl-item__year {
  display: block;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--c-slate);
  transition: color 0.2s var(--ease);
}

@media (min-width: 720px) {
  .page-about .tl-item__year {
    font-size: 19px;
  }
}

.page-about .tl-item:hover .tl-item__year {
  color: var(--c-cyan);
}

.page-about .tl-item__title {
  margin: 8px 0 9px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.6vw, 23px);
  line-height: 1.25;
  color: var(--c-white);
}

.page-about .tl-item__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--c-paper);
}

/* ---------- 团队 ---------- */

.page-about .team-map {
  margin: 0 0 clamp(24px, 3.6vw, 40px);
}

.page-about .team-pillars {
  display: grid;
  gap: 16px;
}

@media (min-width: 720px) {
  .page-about .team-pillars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

.page-about .team-pillar {
  display: flex;
  flex-direction: column;
  padding: 20px 20px 22px;
  background: var(--c-cabin);
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  transition: border-color 0.22s var(--ease);
}

.page-about .team-pillar:hover {
  border-color: var(--c-cyan);
}

.page-about .team-pillar__bar {
  width: 100%;
  height: 56px;
  margin-bottom: 18px;
  border-radius: var(--r-sm);
  border-bottom: 3px solid var(--c-cyan);
  background: linear-gradient(180deg, rgba(62, 242, 210, 0.3), rgba(62, 242, 210, 0.05));
  transition: transform 0.24s var(--ease);
}

.page-about .team-pillar:nth-child(1) .team-pillar__bar {
  height: 88px;
}

.page-about .team-pillar:nth-child(2) .team-pillar__bar {
  height: 99px;
  border-bottom-color: var(--c-orange);
  background: linear-gradient(180deg, rgba(255, 122, 60, 0.28), rgba(255, 122, 60, 0.05));
}

.page-about .team-pillar:nth-child(3) .team-pillar__bar {
  height: 55px;
  border-bottom-color: var(--c-green);
  background: linear-gradient(180deg, rgba(31, 185, 140, 0.28), rgba(31, 185, 140, 0.05));
}

.page-about .team-pillar:hover .team-pillar__bar {
  transform: scaleY(1.03);
  transform-origin: bottom;
}

.page-about .team-pillar__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 10px;
}

.page-about .team-pillar__num {
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--c-white);
}

.page-about .team-pillar__role {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--c-cyan);
}

.page-about .team-pillar__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--c-paper);
}

.page-about .team-note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 16px 20px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-paper);
  background: rgba(62, 242, 210, 0.06);
  border-left: 3px solid var(--c-cyan);
  border-radius: 0 var(--r-md) var(--r-md) 0;
}

/* ---------- 兼容版图 ---------- */

.page-about .compat-map {
  margin: 0 0 clamp(24px, 3.6vw, 40px);
}

.page-about .compat-rail {
  display: grid;
  gap: 10px;
}

.page-about .compat-item {
  background: var(--c-cabin);
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: border-color 0.22s var(--ease);
}

.page-about .compat-item:hover {
  border-color: var(--c-slate);
}

.page-about .compat-item[open] {
  border-color: var(--c-cyan);
}

.page-about .compat-item__head {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .compat-item__head::-webkit-details-marker {
  display: none;
}

.page-about .compat-item__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--c-cyan);
}

.page-about .compat-item[open] .compat-item__head::after {
  content: "–";
}

.page-about .compat-item__sys {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.03em;
  color: var(--c-white);
}

.page-about .compat-item__track {
  flex: 0 0 auto;
  width: clamp(40px, 14vw, 92px);
  height: 4px;
  border-radius: 2px;
  background: var(--c-line);
  position: relative;
  overflow: hidden;
}

.page-about .compat-item__track::after {
  content: "";
  position: absolute;
  inset: 0;
  right: 42%;
  border-radius: 2px;
  background: var(--c-cyan);
}

.page-about .compat-item--ios .compat-item__track::after {
  right: 58%;
}

.page-about .compat-item--harmony .compat-item__track::after {
  right: 30%;
  background: var(--c-green);
}

.page-about .compat-item--windows .compat-item__track::after {
  right: 18%;
  background: var(--c-orange);
}

.page-about .compat-item--macos .compat-item__track::after {
  right: 66%;
  background: var(--c-amber);
}

.page-about .compat-item__head .tag {
  margin-left: 4px;
}

.page-about .compat-item__desc {
  margin: 0;
  padding: 0 18px 18px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-paper);
  border-top: 1px dashed var(--c-line);
  padding-top: 14px;
}

.page-about .compat-note {
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-slate);
}

/* ---------- 服务覆盖 ---------- */

.page-about .reach-grid {
  display: grid;
  gap: 16px;
}

@media (min-width: 680px) {
  .page-about .reach-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

.page-about .reach-stat {
  padding: 22px 22px 20px;
  background: var(--c-cabin);
  border: 1px solid var(--c-line);
  border-top: 3px solid var(--c-amber);
  border-radius: var(--r-md);
  transition: border-top-color 0.22s var(--ease);
}

.page-about .reach-stat:hover {
  border-top-color: var(--c-orange);
}

.page-about .reach-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 36px);
  line-height: 1.05;
  letter-spacing: 0.02em;
  color: var(--c-white);
}

.page-about .reach-stat__unit {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-amber);
}

.page-about .reach-stat__desc {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-paper);
}

.page-about .reach-stat--honor {
  border-top-color: var(--c-green);
}

.page-about .reach-stat--honor .reach-stat__unit {
  color: var(--c-green);
}

/* ---------- 下一页 ---------- */

.page-about .next-list {
  display: grid;
  gap: 12px;
}

@media (min-width: 720px) {
  .page-about .next-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}

.page-about .next-list a {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  background: var(--c-cabin);
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .next-list a:hover,
.page-about .next-list a:focus-visible {
  border-color: var(--c-orange);
  transform: translateY(-2px);
}

.page-about .next-list__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-orange);
}

.page-about .next-list__text {
  display: block;
  min-width: 0;
}

.page-about .next-list__label {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.3;
  color: var(--c-white);
}

.page-about .next-list__hint {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-slate);
}

/* ---------- 图片容器 ---------- */

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

.page-about .media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
}

.page-about .media__caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--c-slate);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .rule,
  .page-about .team-pillar__bar,
  .page-about .next-list a,
  .page-about .tl-item::before,
  .page-about .tl-item__year,
  .page-about .start-list li,
  .page-about .reach-stat {
    transition: none;
  }
}
<<<END>>>