.page-about {
  --about-ink: var(--pitch-ink);
  --about-paper: var(--warm-paper);
  --about-paper-ink: #16241C;
  --about-lime: var(--neon-lime);
  --about-line: var(--grid-moss);
  --about-muted: var(--muted-sage);
  --about-gap: clamp(20px, 5vw, 64px);
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
}

.page-about .about-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 2px;
  width: calc(var(--scroll-progress, 0) * 100%);
  background: var(--about-lime);
  z-index: 90;
  transform-origin: left center;
  pointer-events: none;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(96px, 15vw, 148px) 0 clamp(40px, 7vw, 72px);
  background:
    radial-gradient(120% 90% at 82% 0%, rgba(183, 255, 42, 0.13), transparent 58%),
    linear-gradient(180deg, var(--stadium-green) 0%, var(--pitch-ink) 72%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(38, 66, 55, 0.32) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(38, 66, 55, 0.32) 1px, transparent 1px);
  background-size: 56px 56px;
  pointer-events: none;
  mask-image: linear-gradient(180deg, #000 0%, transparent 86%);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
}

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

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--about-muted);
  margin-bottom: 22px;
}

.page-about .breadcrumb a {
  color: var(--about-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

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

.page-about .about-eyebrow {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--about-lime);
  margin: 0 0 16px;
  padding-left: 12px;
  border-left: 3px solid var(--about-lime);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 7.2vw, 60px);
  line-height: 1.14;
  letter-spacing: 0.01em;
  color: var(--text-strong);
  margin: 0 0 20px;
  max-width: 15ch;
}

.page-about .about-hero .lede {
  font-size: clamp(15px, 2vw, 17px);
  line-height: 1.8;
  color: var(--text);
  max-width: 54ch;
  margin: 0 0 26px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: clamp(26px, 4vw, 40px);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  border-top: 1px solid var(--about-line);
  padding-top: 18px;
}

.page-about .about-hero__stats div {
  padding-right: 10px;
}

.page-about .about-hero__stats dt {
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--about-muted);
  line-height: 1.5;
}

.page-about .about-hero__stats dd {
  margin: 6px 0 0;
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1;
  color: var(--about-lime);
}

.page-about .about-hero__media {
  margin: 0;
  border: 1px solid var(--about-line);
  background: var(--surface);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.page-about .media-frame__caption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--about-muted);
  padding: 10px 14px;
  border-top: 1px solid var(--about-line);
  line-height: 1.5;
}

/* ---------- 正文布局 ---------- */
.page-about .about-body {
  padding: clamp(22px, 4vw, 40px) 0 clamp(56px, 8vw, 96px);
}

.page-about .about-layout {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-index {
  border: 1px solid var(--about-line);
  background: rgba(11, 15, 12, 0.86);
  padding: 16px 14px;
}

.page-about .about-index__label {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--about-muted);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(132px, 1fr);
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__list a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 10px;
  font-size: 13px;
  color: var(--text);
  text-decoration: none;
  border-left: 1px solid var(--line-soft);
  white-space: nowrap;
  transition: color 0.15s ease, background-color 0.15s ease, border-color 0.15s ease;
}

.page-about .about-index__list a .mono {
  font-size: 11px;
  color: var(--about-muted);
  letter-spacing: 0.06em;
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--about-lime);
  background: rgba(183, 255, 42, 0.08);
  border-left-color: var(--about-lime);
  outline: none;
}

.page-about .about-index__list a:hover .mono,
.page-about .about-index__list a:focus-visible .mono {
  color: var(--about-lime);
}

.page-about .about-index__cta {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--about-lime);
  text-decoration: none;
  border-bottom: 1px solid var(--about-lime);
  padding-bottom: 2px;
}

.page-about .about-sections {
  min-width: 0;
  display: grid;
  gap: clamp(28px, 5vw, 56px);
}

.page-about .about-chapter {
  position: relative;
  padding: clamp(22px, 4vw, 40px) 0 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 120px;
}

.page-about .about-chapter__head {
  display: flex;
  gap: 14px;
  align-items: baseline;
  margin-bottom: 16px;
}

.page-about .about-num {
  flex: none;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--about-lime);
  border: 1px solid var(--about-line);
  padding: 3px 8px;
}

.page-about .about-chapter h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 4vw, 34px);
  line-height: 1.22;
  letter-spacing: 0.015em;
  color: var(--text-strong);
  margin: 0;
}

.page-about .about-chapter__lede {
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.8;
  margin: 0 0 24px;
  max-width: 68ch;
}

.page-about .about-chapter__link {
  margin: 22px 0 0;
  font-size: 14px;
  color: var(--about-muted);
}

.page-about .about-chapter__link a {
  color: var(--about-lime);
  text-decoration: none;
  border-bottom: 1px solid var(--about-lime);
  padding-bottom: 1px;
}

/* ---------- 01 看球人群 ---------- */
.page-about .about-audience {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-audience__item {
  background: var(--surface-2);
  padding: 20px 18px;
}

.page-about .about-audience__item h3 {
  font-size: 18px;
  line-height: 1.4;
  margin: 12px 0 8px;
  color: var(--text-strong);
  font-weight: 700;
}

.page-about .about-audience__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text);
}

.page-about .about-note {
  margin: 20px 0 0;
  padding: 16px 18px;
  border-left: 3px solid var(--about-lime);
  background: rgba(183, 255, 42, 0.06);
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-note--award {
  border-left-color: var(--signal-orange);
  background: rgba(255, 90, 54, 0.08);
}

/* ---------- 02 查看路径 ---------- */
.page-about .about-chapter--paper {
  background: var(--about-paper);
  color: var(--about-paper-ink);
  padding: clamp(24px, 4vw, 42px) clamp(18px, 3.4vw, 36px);
  border-top: 1px solid var(--about-paper);
  box-shadow: 6px 6px 0 rgba(183, 255, 42, 0.14);
}

.page-about .about-chapter--paper h2 {
  color: #10231A;
}

.page-about .about-chapter--paper .about-num {
  color: #1F3B2C;
  border-color: rgba(16, 35, 26, 0.35);
}

.page-about .about-chapter--paper .about-chapter__lede {
  color: #26382E;
}

.page-about .about-routes {
  display: grid;
  gap: 1px;
  background: rgba(16, 35, 26, 0.28);
  border: 1px solid rgba(16, 35, 26, 0.28);
}

.page-about .about-route {
  background: transparent;
  padding: 18px 16px;
}

.page-about .about-route__no {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: #10231A;
  background: var(--about-lime);
  padding: 2px 8px;
}

.page-about .about-route h3 {
  margin: 10px 0 6px;
  font-size: 17px;
  color: #10231A;
  font-weight: 800;
}

.page-about .about-route p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: #2C4034;
}

.page-about .about-chapter--paper .about-chapter__link {
  color: #3A5145;
}

.page-about .about-chapter--paper .about-chapter__link a {
  color: #10231A;
  border-bottom-color: #10231A;
}

/* ---------- 03 维护流程 ---------- */
.page-about .about-maintain {
  display: grid;
  gap: clamp(20px, 3vw, 30px);
  align-items: start;
}

.page-about .about-maintain__media {
  margin: 0;
  border: 1px solid var(--about-line);
  background: var(--surface);
}

.page-about .about-maintain__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--about-line);
}

.page-about .about-flow li {
  position: relative;
  padding: 0 0 20px 20px;
}

.page-about .about-flow li::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 7px;
  width: 7px;
  height: 7px;
  background: var(--about-lime);
}

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

.page-about .about-flow .mono {
  display: block;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--about-muted);
  margin-bottom: 4px;
}

.page-about .about-flow strong {
  display: block;
  font-size: 16px;
  color: var(--text-strong);
  margin-bottom: 4px;
}

.page-about .about-flow p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--text);
}

/* ---------- 04 版本时间轴 ---------- */
.page-about .about-versions {
  display: grid;
  gap: clamp(22px, 3.4vw, 34px);
  align-items: start;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 18px;
  border-left: 1px solid rgba(16, 35, 26, 0.35);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 20px 16px;
}

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

.page-about .about-timeline__dot {
  position: absolute;
  left: -5px;
  top: 7px;
  width: 9px;
  height: 9px;
  background: var(--about-paper);
  border: 2px solid #10231A;
}

.page-about .about-timeline__item:last-child .about-timeline__dot {
  background: var(--signal-orange);
  border-color: var(--signal-orange);
}

.page-about .about-timeline__ver {
  margin: 0 0 3px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: #35513F;
}

.page-about .about-timeline__body h3 {
  margin: 0 0 6px;
  font-size: 16.5px;
  line-height: 1.45;
  color: #10231A;
  font-weight: 800;
}

.page-about .fold {
  border: 1px solid rgba(16, 35, 26, 0.24);
  background: rgba(255, 255, 255, 0.28);
}

.page-about .fold__summary {
  cursor: pointer;
  padding: 9px 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: #26382E;
  list-style: none;
}

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

.page-about .fold__summary::after {
  content: "＋";
  float: right;
  color: #10231A;
  font-weight: 700;
}

.page-about .fold[open] .fold__summary::after {
  content: "－";
}

.page-about .fold__summary:hover,
.page-about .fold__summary:focus-visible {
  background: rgba(183, 255, 42, 0.32);
  outline: none;
}

.page-about .fold__body {
  padding: 0 12px 12px;
}

.page-about .fold__body p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: #2C4034;
}

.page-about .about-versions__media {
  margin: 0;
  border: 1px solid rgba(16, 35, 26, 0.28);
  background: rgba(16, 35, 26, 0.06);
}

.page-about .about-versions__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-versions__media .media-frame__caption {
  color: #3A5145;
  border-top-color: rgba(16, 35, 26, 0.24);
}

/* ---------- 05 合作生态 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-partners li {
  min-width: 0;
  display: flex;
}

.page-about .about-partner {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  width: 100%;
  padding: 16px 14px;
  background: var(--surface-2);
  transition: background-color 0.16s ease;
}

.page-about .about-partner__type {
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--about-lime);
}

.page-about .about-partner__name {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--text-strong);
  line-height: 1.4;
}

.page-about .about-partner__detail {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  transform: translateY(8px);
  opacity: 0;
  visibility: hidden;
  padding: 12px 14px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--about-paper-ink);
  background: var(--about-lime);
  transition: opacity 0.16s ease, transform 0.16s ease, visibility 0.16s;
  z-index: 2;
}

.page-about .about-partner:hover,
.page-about .about-partner:focus-visible {
  background: #173327;
  outline: none;
}

.page-about .about-partner:hover .about-partner__detail,
.page-about .about-partner:focus-visible .about-partner__detail {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ---------- 06 联系 ---------- */
.page-about .about-chapter--contact {
  border-top-color: var(--about-lime);
}

.page-about .about-contact {
  display: grid;
  gap: 20px;
  border: 1px solid var(--about-line);
  background: var(--surface);
  padding: clamp(16px, 3vw, 26px);
}

.page-about .about-contact__list {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-contact__list dt {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--about-muted);
  margin-bottom: 3px;
}

.page-about .about-contact__list dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-strong);
  overflow-wrap: anywhere;
}

.page-about .about-contact__list a {
  color: var(--text-strong);
  text-decoration: none;
  border-bottom: 1px solid var(--about-line);
}

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

.page-about .about-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

/* ---------- 固定小按钮 ---------- */
.page-about .about-jump {
  position: fixed;
  right: 14px;
  bottom: 18px;
  z-index: 80;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 56px;
  height: 44px;
  padding: 0 14px;
  background: var(--about-lime);
  color: #06100B;
  text-decoration: none;
  font-size: 12px;
  letter-spacing: 0.1em;
  border: 1px solid #06100B;
  box-shadow: 4px 4px 0 rgba(6, 16, 11, 0.55);
}

.page-about .about-jump:hover,
.page-about .about-jump:focus-visible {
  background: var(--score-white);
  outline: 2px solid var(--about-lime);
  outline-offset: 2px;
}

@media (min-width: 760px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    align-items: end;
  }

  .page-about .about-audience {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-routes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-maintain {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  }

  .page-about .about-contact {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: end;
  }

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

  .page-about .about-jump {
    right: 24px;
    bottom: 24px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(36px, 4vw, 64px);
  }

  .page-about .about-index {
    position: sticky;
    top: 118px;
    padding: 18px 16px;
  }

  .page-about .about-index__list {
    grid-auto-flow: row;
    grid-auto-columns: auto;
    overflow: visible;
  }

  .page-about .about-index__list a {
    border-left: 2px solid var(--line-soft);
    white-space: normal;
    padding: 10px 12px;
  }

  .page-about .about-chapter {
    padding-top: clamp(30px, 3.4vw, 48px);
  }

  .page-about .about-chapter--paper {
    padding: clamp(28px, 3.4vw, 48px) clamp(24px, 3.4vw, 48px);
    margin-right: clamp(0px, 2vw, 24px);
  }

  .page-about .about-versions {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .about-versions__media {
    position: sticky;
    top: 118px;
  }

  .page-about .about-chapter__lede {
    max-width: 64ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__list a,
  .page-about .about-partner,
  .page-about .about-partner__detail,
  .page-about .about-progress {
    transition: none;
  }
}
<<<PAGE_CSS_END>>>