.page-about {
  --about-gap: clamp(32px, 5vw, 72px);
  --about-sec-gap: clamp(60px, 9vw, 140px);
  --about-track-pad: clamp(22px, 3vw, 40px);
}

/* ---------- 页首 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(40px, 6vw, 76px) 0 clamp(40px, 6vw, 68px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(900px 340px at 88% 0%, rgba(36, 26, 92, .55), transparent 70%),
    radial-gradient(700px 300px at 4% 100%, rgba(12, 58, 63, .45), transparent 72%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(46%, 520px);
  height: 100%;
  background-image:
    linear-gradient(to right, rgba(198, 255, 74, .16) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(198, 255, 74, .16) 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: .55;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(to left, #000, transparent);
  mask-image: linear-gradient(to left, #000, transparent);
}

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

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

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(32px, 5.4vw, 64px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--ink);
  max-width: 16em;
}

.page-about .about-hero__lede {
  margin: clamp(20px, 3vw, 32px) 0 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-hero__meta {
  margin: clamp(24px, 3vw, 34px) 0 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .03em;
  color: var(--dim);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  padding: clamp(40px, 7vw, 88px) 0 clamp(64px, 10vw, 128px);
}

/* ---------- 左侧竖向时间轴 ---------- */
.page-about .about-axis {
  align-self: start;
  min-width: 0;
}

.page-about .about-axis__label {
  margin: 0 0 18px;
  font-family: var(--font-narrow);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--lime);
  text-transform: uppercase;
}

.page-about .about-axis__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 22px;
}

.page-about .about-axis__list::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, var(--lime), var(--line) 24%, var(--line));
}

.page-about .about-axis__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0;
  color: var(--dim);
  text-decoration: none;
  transition: color var(--t-fast);
}

.page-about .about-axis__link::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 50%;
  width: 7px;
  height: 7px;
  background: var(--bg);
  border: 1px solid var(--line);
  transform: translate(-50%, -50%);
  transition: background var(--t-fast), border-color var(--t-fast);
}

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

.page-about .about-axis__link:hover::before,
.page-about .about-axis__link:focus-visible::before,
.page-about .about-axis__link.is-active::before {
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .about-axis__link.is-active {
  color: var(--lime);
}

.page-about .about-axis__num {
  font-size: 11px;
  color: var(--dim);
}

.page-about .about-axis__name {
  font-family: var(--font-narrow);
  font-size: 14px;
  letter-spacing: .06em;
}

/* ---------- 右侧章节流 ---------- */
.page-about .about-stream {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-sec-gap);
  min-width: 0;
}

.page-about .about-sec {
  position: relative;
  min-width: 0;
  scroll-margin-top: calc(var(--header-h) + 28px);
  transition: background-color var(--t-mid), box-shadow var(--t-mid);
}

.page-about .about-sec__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3vw, 38px);
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: var(--ink);
  max-width: 20em;
}

.page-about .about-sec p {
  margin: 18px 0 0;
  max-width: 62ch;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-sec a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 255, 74, .42);
  transition: border-color var(--t-fast);
}

.page-about .about-sec a:hover {
  border-bottom-color: var(--lime);
}

.page-about .about-sec a.btn {
  border-bottom: 0;
  text-decoration: none;
}

.page-about .about-sec__link {
  margin-top: clamp(24px, 3vw, 36px);
}

/* 悬停左轴节点时同步提亮对应章节 */
.page-about:has(.about-axis__link[href="#about-1"]:hover) #about-1,
.page-about:has(.about-axis__link[href="#about-2"]:hover) #about-2,
.page-about:has(.about-axis__link[href="#about-3"]:hover) #about-3,
.page-about:has(.about-axis__link[href="#about-4"]:hover) #about-4,
.page-about:has(.about-axis__link[href="#about-5"]:hover) #about-5,
.page-about:has(.about-axis__link[href="#about-6"]:hover) #about-6 {
  background-image: linear-gradient(to right, rgba(22, 32, 74, .85), rgba(22, 32, 74, 0) 46%);
  box-shadow: inset 2px 0 0 var(--lime);
}

/* ---------- 赛季推进轨道 ---------- */
.page-about .about-track {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0 0 0 var(--about-track-pad);
  border-left: 1px solid var(--line);
}

.page-about .about-track__item {
  position: relative;
  padding-bottom: clamp(26px, 4vw, 44px);
}

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

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--about-track-pad));
  top: 7px;
  width: 9px;
  height: 9px;
  background: var(--bg);
  border: 1px solid var(--lime);
  transform: translateX(-50%);
  transition: background var(--t-fast);
}

.page-about .about-track__item:hover::before {
  background: var(--lime);
}

.page-about .about-sec .about-track__stage {
  margin: 0 0 6px;
  font-family: var(--font-narrow);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--lime);
  max-width: none;
}

.page-about .about-track__title {
  margin: 0;
  font-family: var(--font-body);
  font-size: clamp(17px, 1.4vw, 19px);
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .about-sec .about-track__note {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 58ch;
}

/* ---------- 图表与图片 ---------- */
.page-about .about-figure {
  margin: clamp(28px, 4vw, 44px) 0 0;
  min-width: 0;
}

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

.page-about .about-figure img {
  width: 100%;
  border: 1px solid var(--line);
}

.page-about .about-figure__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--dim);
}

.page-about .about-geo__figure {
  margin: 0 0 clamp(26px, 3.6vw, 44px);
}

.page-about .about-geo__figure img {
  width: 100%;
  height: clamp(180px, 26vw, 340px);
  border: 1px solid var(--line);
}

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

.page-about .about-river img {
  width: 100%;
  height: clamp(140px, 20vw, 250px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

/* ---------- 品牌主张 ---------- */
.page-about .motto-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 38px);
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .motto-card {
  border-top: 1px solid var(--line);
  padding-top: 18px;
}

.page-about .motto-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.3vw, 27px);
  font-weight: 700;
  color: var(--lime);
}

.page-about .motto-card:last-child h3 {
  color: var(--orange);
}

.page-about .motto-card p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 44ch;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-sec--split {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: clamp(24px, 3.4vw, 48px);
    align-items: start;
  }

  .page-about .about-sec--split .about-figure {
    margin-top: 0;
  }

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

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(48px, 7vw, 112px);
  }

  .page-about .about-axis {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

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

@media (max-width: 480px) {
  .page-about .about-hero::before {
    width: 100%;
    opacity: .3;
  }

  .page-about .about-axis__list {
    padding-left: 18px;
  }

  .page-about .about-axis__link::before {
    left: -18px;
  }

  .page-about .about-sec p,
  .page-about .about-sec .about-track__note {
    max-width: none;
  }
}
</PAGE_CSS>>>