.page-about {
  --about-frame-radius: var(--r-md);
  background: var(--ink);
  color: var(--body);
  overflow-x: clip;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(36px, 6vw, 72px) 0 clamp(26px, 4vw, 48px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -32%;
  right: -14%;
  width: min(680px, 74vw);
  height: min(680px, 74vw);
  background: radial-gradient(circle at 42% 42%, rgba(214, 40, 40, .20), rgba(214, 40, 40, 0) 66%);
  pointer-events: none;
  z-index: 0;
}

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

.page-about .hero-frame {
  position: relative;
  margin-top: clamp(18px, 3vw, 32px);
  padding: clamp(26px, 4vw, 56px) clamp(22px, 4vw, 56px);
  border: 1px solid var(--line);
  border-radius: var(--about-frame-radius);
  background: linear-gradient(180deg, rgba(22, 39, 61, .62) 0%, rgba(11, 22, 38, .28) 100%);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.page-about .hero-frame::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 132px;
  height: 132px;
  background: linear-gradient(135deg, transparent 50%, rgba(214, 40, 40, .16) 50%);
  pointer-events: none;
}

.page-about .hero-scale {
  position: absolute;
  top: 20px;
  bottom: 20px;
  left: 10px;
  width: 1px;
  background-image: repeating-linear-gradient(180deg, rgba(255, 255, 255, .26) 0 1px, transparent 1px 14px);
  pointer-events: none;
}

.page-about .hero-frame h1 {
  margin: 14px 0 18px;
  font-size: clamp(32px, 5vw, 64px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--fog);
}

.page-about .hero-frame .lead {
  max-width: 62ch;
  font-size: clamp(16px, 1.4vw, 19px);
  line-height: 1.78;
  color: var(--body);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(24px, 3.5vw, 40px);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  overflow: hidden;
}

.page-about .about-stats .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  background: rgba(11, 22, 38, .86);
}

.page-about .about-stats .stat-value {
  font-family: var(--mono);
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1;
  color: var(--fog);
}

.page-about .about-stats .stat-value--mint {
  color: var(--mint);
}

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

/* ---------- 主体两栏：刻度导轨 + 正文 ---------- */
.page-about .about-main {
  padding: clamp(12px, 2vw, 24px) 0 clamp(40px, 6vw, 88px);
}

.page-about .about-main__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about .about-rail {
  display: none;
}

.page-about .about-rail__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rail__item {
  position: relative;
  padding-left: 24px;
}

.page-about .about-rail__item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--line);
}

.page-about .about-rail__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: var(--ink);
  transition: background 200ms var(--ease), border-color 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-about .about-rail__link {
  display: block;
  padding: 8px 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
  text-decoration: none;
  transition: color 200ms var(--ease);
}

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

.page-about .about-rail__item:hover::after,
.page-about .about-rail__item:focus-within::after {
  border-color: var(--mint);
  background: var(--mint);
  box-shadow: 0 0 0 4px rgba(33, 230, 166, .16);
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  position: relative;
  padding: clamp(32px, 5vw, 64px) 0;
}

.page-about .about-sec:first-child {
  padding-top: 10px;
}

.page-about .about-sec + .about-sec::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: min(320px, 55%);
  height: 1px;
  background: linear-gradient(90deg, rgba(214, 40, 40, .58), rgba(33, 230, 166, .20) 46%, transparent);
  transform: skewX(-32deg);
  transform-origin: left center;
}

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px 14px;
  margin-bottom: clamp(16px, 2.5vw, 26px);
}

.page-about .about-sec__idx {
  flex: 0 0 auto;
  padding: 3px 8px;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--red);
  border: 1px solid rgba(214, 40, 40, .38);
  border-radius: var(--r-sm);
  background: rgba(214, 40, 40, .10);
}

.page-about .about-sec__head h2 {
  margin: 0;
  font-size: clamp(24px, 3.2vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--fog);
}

.page-about .about-sec p {
  margin: 0 0 1.1em;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--body);
}

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

.page-about .about-sec a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(33, 230, 166, .35);
  transition: border-color 200ms var(--ease), color 200ms var(--ease);
}

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

/* ---------- 图文非对称分栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
  align-items: start;
}

.page-about .about-figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--slate);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.9) contrast(1.04) brightness(.94);
}

.page-about .about-figure .media-caption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.62;
  color: var(--muted);
}

.page-about .about-figure--wide {
  margin: clamp(20px, 3vw, 32px) 0;
}

/* ---------- 流程步骤 ---------- */
.page-about .about-steps {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  background: var(--ink);
  transition: background 220ms var(--ease);
}

.page-about .about-steps__item:hover {
  background: rgba(22, 39, 61, .78);
}

.page-about .about-steps__num {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding-top: 20px;
  font-size: 15px;
  letter-spacing: .06em;
  color: var(--mint);
  border-right: 1px solid var(--line);
}

.page-about .about-steps__body {
  padding: 18px 20px 22px;
}

.page-about .about-steps__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .about-steps__body p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 数据来源双栏 ---------- */
.page-about .about-sources {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(20px, 3vw, 30px) 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-sources__col {
  padding: clamp(20px, 3vw, 32px);
  background: var(--slate);
}

.page-about .about-sources__col--official {
  background: linear-gradient(160deg, rgba(214, 40, 40, .16), rgba(22, 39, 61, .96) 62%);
}

.page-about .about-sources__count {
  display: block;
  font-size: clamp(36px, 5vw, 52px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--fog);
}

.page-about .about-sources__col--media .about-sources__count {
  color: var(--mint);
}

.page-about .about-sources__col h3 {
  margin: 12px 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--fog);
}

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

/* ---------- 集锦版本条 ---------- */
.page-about .about-versions {
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px 8px;
}

.page-about .about-ver {
  position: relative;
  display: flex;
  flex-direction: column;
}

.page-about .about-ver__tag {
  display: block;
  padding: 9px 0 11px;
  text-align: center;
  font-size: 12px;
  letter-spacing: .02em;
  color: var(--fog);
  border-top: 2px solid var(--red);
  background: linear-gradient(180deg, rgba(214, 40, 40, .18), rgba(214, 40, 40, 0));
  transition: background 200ms var(--ease), color 200ms var(--ease), border-color 200ms var(--ease);
  cursor: default;
}

.page-about .about-ver__tag:hover,
.page-about .about-ver__tag:focus-visible {
  outline: none;
  border-top-color: var(--mint);
  background: linear-gradient(180deg, rgba(33, 230, 166, .20), rgba(33, 230, 166, 0));
}

.page-about .about-ver--legacy .about-ver__tag {
  border-top-color: rgba(214, 40, 40, .40);
  opacity: .62;
}

.page-about .about-ver__note {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 10px);
  z-index: 4;
  width: max-content;
  max-width: 190px;
  padding: 8px 10px;
  font-size: 12px;
  line-height: 1.55;
  color: var(--body);
  background: var(--ink-deep);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-sm);
  opacity: 0;
  visibility: hidden;
  transform: translate(-50%, 6px);
  transition: opacity 200ms var(--ease), transform 200ms var(--ease), visibility 200ms;
  pointer-events: none;
}

.page-about .about-ver__tag:hover + .about-ver__note,
.page-about .about-ver__tag:focus-visible + .about-ver__note {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

/* ---------- 赛季节奏 ---------- */
.page-about .about-season {
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-season__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.page-about .about-season__panel {
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(150deg, rgba(22, 39, 61, .78), rgba(11, 22, 38, .72));
}

.page-about .about-season__panel + .about-season__panel {
  margin-top: 12px;
}

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

.page-about .about-season__panel li {
  position: relative;
  padding-left: 22px;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.72;
  color: var(--body);
}

.page-about .about-season__panel li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: .62em;
  width: 6px;
  height: 6px;
  background: var(--mint);
  transform: rotate(45deg);
}

.page-about .about-season__panel li a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(33, 230, 166, .35);
}

.page-about .about-season__panel li a:hover,
.page-about .about-season__panel li a:focus-visible {
  color: var(--fog);
  border-bottom-color: var(--fog);
}

/* ---------- 结尾指路 ---------- */
.page-about .about-cta {
  padding: 0 0 clamp(48px, 7vw, 96px);
}

.page-about .about-cta__panel {
  position: relative;
  padding: clamp(28px, 4vw, 52px);
  border: 1px solid rgba(214, 40, 40, .34);
  border-radius: var(--r-md);
  background: linear-gradient(135deg, rgba(214, 40, 40, .24), rgba(6, 13, 24, .94) 62%), var(--ink-deep);
  overflow: hidden;
}

.page-about .about-cta__panel::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 220px;
  height: 3px;
  background: linear-gradient(90deg, var(--red), var(--mint));
}

.page-about .about-cta__panel h2 {
  margin: 0 0 12px;
  font-size: clamp(22px, 2.6vw, 32px);
  line-height: 1.24;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--fog);
}

.page-about .about-cta__panel p {
  margin: 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--body);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-versions {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

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

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

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-versions {
    grid-template-columns: repeat(9, minmax(0, 1fr));
    gap: 10px 6px;
  }

  .page-about .about-season__panel {
    padding: clamp(24px, 2.6vw, 34px);
  }
}

@media (min-width: 1024px) {
  .page-about .about-main__inner {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(32px, 4.5vw, 72px);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 28px);
    padding-top: 14px;
  }
}
<<<END>>>