.page-about {
  --about-rail-w: 236px;
  --about-sticky: calc(var(--hud-h) + 20px);
}

.page-about .about-topbar {
  padding-top: 22px;
  padding-bottom: 4px;
}

.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding-top: 14px;
  padding-bottom: 72px;
}

@media (min-width: 900px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    column-gap: 56px;
    padding-top: 20px;
  }
}

/* ---------- 左侧吸附目录 ---------- */
.page-about .about-rail {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-about .about-rail__kicker {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--dim);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 7px 10px;
  font-size: 13px;
  color: var(--mute);
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid var(--line);
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease), background-color 0.22s var(--ease);
}

.page-about .about-rail__num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--dim);
  transition: color 0.22s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
  background: rgba(166, 242, 75, 0.06);
}

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

.page-about .about-rail__note {
  margin: 14px 0 0;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--dim);
}

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

@media (min-width: 900px) {
  .page-about .about-rail {
    position: sticky;
    top: var(--about-sticky);
    align-self: start;
  }

  .page-about .about-rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__item + .about-rail__item {
    margin-top: -1px;
  }

  .page-about .about-rail__link {
    padding: 10px 12px;
    font-size: 14px;
    border-color: transparent;
    border-bottom-color: var(--line);
  }

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

@media (min-width: 1180px) {
  .page-about .about-rail__rotate {
    display: block;
    margin: 34px 0 0;
    height: 200px;
    padding-right: 10px;
    border-right: 1px solid var(--line);
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.3em;
    color: var(--dim);
    text-transform: uppercase;
  }
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  border-top: 1px solid var(--line);
  padding-top: 26px;
  padding-bottom: 44px;
}

.page-about .about-hero__kicker {
  margin: 0 0 16px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-size: clamp(30px, 5.4vw, 54px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mute);
}

.page-about .about-figures {
  margin: 30px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

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

.page-about .about-figure {
  background: var(--panel);
  padding: 16px 14px;
}

.page-about .about-figure dt {
  margin: 0 0 8px;
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--dim);
}

.page-about .about-figure dd {
  margin: 0;
  font-size: 15px;
  color: var(--mute);
}

.page-about .about-figure dd .num {
  margin-right: 3px;
  font-family: var(--mono);
  font-size: 24px;
  color: var(--lime);
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  border-top: 1px solid var(--line);
  padding: 40px 0 12px;
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 20px;
}

.page-about .about-chapter__num {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .about-chapter__title {
  margin: 0;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.15;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-chapter__lede {
  margin: 0 0 28px;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mute);
}

/* ---------- 01 内容形态 ---------- */
.page-about .what-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

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

.page-about .what-item {
  background: var(--panel);
  padding: 22px 20px 24px;
}

.page-about .what-item h3 {
  position: relative;
  margin: 0 0 10px;
  padding-left: 14px;
  font-size: 17px;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .what-item h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.42em;
  width: 5px;
  height: 5px;
  background: var(--lime);
}

.page-about .what-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mute);
}

/* ---------- 02 团队 ---------- */
.page-about .team-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

@media (min-width: 900px) {
  .page-about .team-layout {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    align-items: start;
    gap: 34px;
  }
}

.page-about .team-bars {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 24px;
}

.page-about .team-bar {
  display: block;
}

.page-about .team-bar__top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 9px;
}

.page-about .team-bar__role {
  font-size: 16px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .team-bar__count {
  font-family: var(--mono);
  font-size: 20px;
  color: var(--lime);
}

.page-about .team-bar__track {
  height: 6px;
  background: var(--panel-2);
  overflow: hidden;
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
  width: var(--w, 0%);
  background: linear-gradient(90deg, var(--lime), var(--gold));
  transform-origin: left center;
  transition: filter 0.24s var(--ease);
}

.page-about .team-bar:hover .team-bar__fill,
.page-about .team-bar:focus-within .team-bar__fill {
  filter: brightness(1.2);
}

.page-about .team-bar__desc {
  margin: 11px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mute);
}

.page-about .team-bar:nth-child(1) {
  --w: 42.1%;
}

.page-about .team-bar:nth-child(2) {
  --w: 31.6%;
}

.page-about .team-bar:nth-child(3) {
  --w: 26.3%;
}

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

.page-about .about-photo img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 03 流程 ---------- */
.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .flow-step {
  position: relative;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  padding-bottom: 26px;
}

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

.page-about .flow-step::before {
  content: "";
  position: absolute;
  left: 21px;
  top: 30px;
  bottom: 2px;
  width: 1px;
  background: var(--line);
}

.page-about .flow-step:last-child::before {
  display: none;
}

.page-about .flow-step__num {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 44px;
  height: 30px;
  background: var(--ink);
  border: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--lime);
}

.page-about .flow-step__title {
  margin: 3px 0 8px;
  font-size: 17px;
  color: var(--paper);
}

.page-about .flow-step__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mute);
}

.page-about .flow-note {
  margin: 26px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.75;
  color: var(--dim);
}

.page-about .flow-note .link {
  color: var(--lime);
}

/* ---------- 04 版本时间轴 ---------- */
.page-about .about-timeline-photo {
  margin: 0 0 8px;
}

.page-about .about-timeline-photo img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .tl {
  position: relative;
  padding: 0 0 22px 24px;
  border-left: 1px solid var(--line);
}

.page-about .tl:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .tl__dot {
  position: absolute;
  left: -4px;
  top: 5px;
  width: 7px;
  height: 7px;
  background: var(--dim);
  border-radius: 50%;
  transition: background-color 0.22s var(--ease), box-shadow 0.22s var(--ease);
}

.page-about .tl:hover .tl__dot,
.page-about .tl:focus-within .tl__dot {
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(166, 242, 75, 0.16);
}

.page-about .tl__ver {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .tl__year {
  margin-left: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--dim);
}

.page-about .tl__title {
  margin: 5px 0 6px;
  font-size: 15px;
  color: var(--paper);
}

.page-about .tl__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mute);
}

@media (min-width: 900px) {
  .page-about .timeline {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    column-gap: 16px;
    margin-top: 34px;
    border-top: 1px solid var(--line);
  }

  .page-about .tl {
    border-left: 0;
    padding: 26px 0 0;
  }

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

  .page-about .tl::before {
    content: "";
    position: absolute;
    left: 3px;
    top: 0;
    width: 1px;
    height: 20px;
    background: var(--line);
  }

  .page-about .tl__dot {
    left: 0;
    top: 16px;
  }

  .page-about .tl__ver {
    font-size: 12px;
  }

  .page-about .tl__title {
    font-size: 14px;
    line-height: 1.3;
  }

  .page-about .tl__desc {
    font-size: 13px;
    line-height: 1.6;
  }
}

/* ---------- 05 赛事覆盖 ---------- */
.page-about .coverage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

@media (min-width: 900px) {
  .page-about .coverage {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    align-items: center;
    gap: 32px;
  }
}

.page-about .coverage__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .coverage__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.85) brightness(0.78);
}

.page-about .coverage__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 10px 14px;
  background: rgba(5, 15, 12, 0.84);
  border-top: 1px solid var(--line);
  border-right: 1px solid var(--line);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--paper);
}

.page-about .coverage__cap .num {
  font-family: var(--mono);
  color: var(--gold);
}

.page-about .coverage__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mute);
}

.page-about .cover-chips {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .columns-list {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .columns-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 7px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

@media (min-width: 760px) {
  .page-about .columns-row {
    grid-template-columns: 132px 112px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }
}

.page-about .columns-row__name {
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .columns-row__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mute);
}

/* ---------- 06 原则 ---------- */
.page-about .principles {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .principle {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.page-about .principle:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .principle__num {
  padding-top: 3px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .principle__title {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .principle__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mute);
}

/* ---------- 收口 ---------- */
.page-about .about-cta {
  margin-top: 48px;
  padding: 24px 20px;
  border: 1px solid var(--line);
  background: var(--panel);
  display: grid;
  gap: 18px;
}

@media (min-width: 760px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 28px 32px;
    gap: 28px;
  }
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mute);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}