.page-about {
  --about-index-w: 168px;
  --about-prose: 620px;
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(26px, 4vw, 54px) clamp(34px, 6vw, 74px);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 40px);
}

.page-about .about-hero h1 {
  max-width: 20ch;
}

.page-about .about-hero .lede {
  max-width: 46ch;
  margin-top: 20px;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    column-gap: clamp(36px, 5vw, 64px);
    align-items: end;
  }
}

/* ---------- 数据条 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

@media (min-width: 560px) {
  .page-about .about-stats--2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-stats--3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-stats .data-cell {
  min-width: 0;
  padding: 15px 18px;
  background: var(--ink-2);
}

.page-about .about-stats dt,
.page-about .about-stats dd {
  margin: 0;
}

.page-about .about-stats .data-label {
  display: block;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .about-stats .data-value {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.1vw, 23px);
  line-height: 1.2;
  color: var(--num);
}

/* ---------- 双栏主体 ---------- */
.page-about .about-body {
  display: flex;
  flex-direction: column;
  gap: clamp(36px, 5vw, 56px);
  padding-bottom: clamp(46px, 8vw, 92px);
}

@media (min-width: 1024px) {
  .page-about .about-body {
    flex-direction: row;
    align-items: flex-start;
    gap: clamp(40px, 5vw, 64px);
  }
}

/* ---------- 左侧章节索引 ---------- */
.page-about .about-index {
  display: none;
}

@media (min-width: 1024px) {
  .page-about .about-index {
    display: block;
    flex: 0 0 var(--about-index-w);
    position: sticky;
    top: calc(var(--hdr-h) + 30px);
  }
}

.page-about .about-index__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-index__list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__list a {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 8px 10px 8px 12px;
  border-left: 2px solid transparent;
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  font-size: 14px;
  line-height: 1.45;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--text);
  background: rgba(53, 241, 196, 0.06);
  border-left-color: rgba(53, 241, 196, 0.42);
}

.page-about .about-index__list a.is-active {
  color: var(--cyan);
  background: rgba(53, 241, 196, 0.09);
  border-left-color: var(--cyan);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
}

/* ---------- 内容流 ---------- */
.page-about .about-flow {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(46px, 7vw, 86px);
}

.page-about .about-section {
  scroll-margin-top: calc(var(--hdr-h) + 26px);
}

@media (min-width: 1100px) {
  .page-about .about-section {
    display: grid;
    grid-template-columns: minmax(0, 1fr) clamp(200px, 24%, 286px);
    column-gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }
}

.page-about .about-section--plain {
  display: block;
}

.page-about .about-col {
  max-width: 720px;
  min-width: 0;
}

.page-about .about-section .section-title,
.page-about .about-band .section-title {
  font-family: var(--font-serif);
  font-size: clamp(23px, 2.5vw, 33px);
  line-height: 1.34;
  letter-spacing: 0;
  max-width: 20ch;
}

.page-about .about-section .prose {
  max-width: var(--about-prose);
  margin-top: 18px;
}

/* ---------- 内容生产四步 ---------- */
.page-about .about-section .media-frame {
  margin: 24px 0 0;
}

.page-about .step-list {
  display: grid;
  gap: 12px;
  max-width: var(--about-prose);
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .step-item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 18px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  transition: border-color 0.24s ease, background-color 0.24s ease;
}

.page-about .step-item:hover {
  border-color: rgba(53, 241, 196, 0.34);
  background: rgba(53, 241, 196, 0.05);
}

.page-about .step-no {
  font-family: var(--font-mono);
  font-size: 19px;
  line-height: 1.3;
  color: var(--cyan);
}

.page-about .step-title {
  margin: 0;
  font-weight: 700;
  font-size: 16px;
  color: var(--text);
}

.page-about .step-text {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 版本时间线全宽段 ---------- */
.page-about .about-band {
  position: relative;
  isolation: isolate;
  padding-block: clamp(42px, 7vw, 86px);
}

.page-about .about-band::before {
  content: "";
  position: absolute;
  inset: 0 calc(50% - 50vw);
  z-index: -1;
  background: linear-gradient(180deg, rgba(12, 31, 26, 0.96), rgba(6, 18, 15, 0.96));
  border-block: 1px solid var(--line);
}

.page-about .about-band__tex {
  position: absolute;
  inset: 0 calc(50% - 50vw);
  width: auto;
  height: 100%;
  object-fit: cover;
  opacity: 0.16;
  filter: saturate(0.6) contrast(1.1);
  pointer-events: none;
  z-index: -1;
}

.page-about .ver-track {
  display: grid;
  gap: 14px;
  margin-top: clamp(24px, 4vw, 42px);
}

@media (min-width: 860px) {
  .page-about .ver-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

.page-about .ver-step {
  position: relative;
  padding: 18px 20px 20px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  transition: border-color 0.24s ease, box-shadow 0.24s ease;
}

.page-about .ver-step[open] {
  border-color: rgba(53, 241, 196, 0.45);
  box-shadow: 0 0 0 1px rgba(53, 241, 196, 0.12), 0 22px 48px -32px rgba(53, 241, 196, 0.7);
}

@media (min-width: 860px) {
  .page-about .ver-step + .ver-step::before {
    content: "";
    position: absolute;
    top: 34px;
    right: 100%;
    width: 20px;
    height: 1px;
    background: linear-gradient(90deg, rgba(53, 241, 196, 0.16), rgba(53, 241, 196, 0.6));
  }
}

.page-about .ver-step summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ver-step summary::after {
  content: "+";
  order: 99;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--cyan);
}

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

.page-about .ver-node {
  flex: 0 0 auto;
  color: var(--cyan);
}

.page-about .ver-tag {
  padding: 2px 10px;
  border-radius: var(--r-pill);
  background: var(--cyan);
  color: var(--on-cyan);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
}

.page-about .ver-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
}

.page-about .ver-year {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--muted);
}

.page-about .ver-body {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
}

.page-about .ver-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 赛事与地区 ---------- */
.page-about .about-section--media {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

@media (min-width: 1100px) {
  .page-about .about-section--media {
    grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
    column-gap: clamp(32px, 5vw, 64px);
    align-items: start;
  }
}

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

.page-about .about-section--media .about-stats {
  margin-top: 26px;
}

/* ---------- 合作生态 ---------- */
.page-about .partner-list {
  display: grid;
  gap: 10px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 760px) {
  .page-about .partner-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 16px;
  }
}

.page-about .partner-item {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-left: 2px solid var(--line);
  border-radius: var(--r-sm);
  transition: border-color 0.24s ease, background-color 0.24s ease;
}

.page-about .partner-item:hover,
.page-about .partner-item:focus-within {
  border-left-color: var(--cyan);
  background: rgba(53, 241, 196, 0.06);
}

.page-about .partner-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.page-about .partner-more {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  opacity: 0.78;
  transition: opacity 0.24s ease, color 0.24s ease;
}

.page-about .partner-item:hover .partner-more,
.page-about .partner-item:focus-within .partner-more {
  opacity: 1;
  color: var(--cyan-soft);
}

.page-about .partner-foot {
  margin: 22px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 更新节奏 ---------- */
.page-about .rhythm-list {
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .rhythm-list .index-item {
  transition: background-color 0.2s ease;
}

.page-about .rhythm-list .index-item:hover {
  background: rgba(53, 241, 196, 0.05);
}

.page-about .rhythm-list .index-item:hover .index-title {
  color: var(--cyan);
}

.page-about .rhythm-list .index-meta {
  font-family: var(--font-mono);
  font-size: 13px;
}

/* ---------- 底部行动区 ---------- */
.page-about .about-cta {
  padding-block: clamp(46px, 7vw, 86px);
  background:
    radial-gradient(120% 140% at 12% 0%, rgba(53, 241, 196, 0.14), transparent 62%),
    var(--ink-2);
  border-top: 1px solid var(--line);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 26px;
}

@media (min-width: 860px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: center;
    column-gap: clamp(32px, 5vw, 64px);
  }
}

.page-about .about-cta h2 {
  margin: 0;
  font-size: clamp(22px, 2.4vw, 31px);
  line-height: 1.35;
}

.page-about .about-cta p {
  max-width: 44ch;
  margin: 12px 0 0;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
<<<END>>>