.page-about {
  --about-axis-w: 224px;
  --about-gap: clamp(28px, 4vw, 64px);
  --about-chapter-space: clamp(44px, 6vw, 84px);
  background: var(--xb-ink);
  color: var(--xb-paper);
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--xb-header-h) + clamp(44px, 7.5vw, 104px)) 0 clamp(40px, 5.5vw, 76px);
  border-bottom: 1px solid var(--xb-line-soft);
  background:
    radial-gradient(115% 90% at 88% -10%, rgba(53, 242, 192, .14), transparent 60%),
    radial-gradient(80% 70% at 0% 110%, rgba(217, 80, 63, .08), transparent 65%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -14%;
  bottom: 8%;
  width: min(620px, 62vw);
  height: 240px;
  background: linear-gradient(100deg, rgba(53, 242, 192, .13), rgba(89, 199, 216, .05) 55%, transparent);
  transform: skewY(-8deg);
  pointer-events: none;
}

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

.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-family: var(--xb-font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--xb-signal);
}

.page-about .about-hero__eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: currentColor;
}

.page-about .about-hero__title {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 19ch;
  font-family: var(--xb-font-display);
  font-weight: 700;
  font-size: clamp(34px, 5.6vw, 74px);
  line-height: 1.04;
  letter-spacing: -.01em;
  color: var(--xb-paper);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 60ch;
  font-size: 17px;
  line-height: 1.85;
  color: rgba(243, 240, 231, .76);
}

/* ---------- 主体骨架 ---------- */

.page-about .about-body {
  max-width: var(--xb-shell);
  margin-inline: auto;
  padding: clamp(30px, 5vw, 62px) var(--xb-gutter) clamp(56px, 8vw, 112px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 52px);
  align-items: start;
}

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

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-axis-w) minmax(0, 1fr);
    gap: var(--about-gap);
  }
}

/* ---------- 目录轴 ---------- */

.page-about .about-toc {
  border-top: 1px solid var(--xb-line);
  padding-top: 14px;
}

.page-about .about-toc__title {
  margin: 0 0 12px;
  font-family: var(--xb-font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--xb-stone);
}

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

.page-about .about-toc__link {
  display: block;
  padding: 7px 0 7px 14px;
  border-left: 2px solid var(--xb-line-soft);
  font-size: 14px;
  line-height: 1.45;
  color: rgba(243, 240, 231, .62);
  text-decoration: none;
  transition: color .22s var(--xb-ease), border-color .22s var(--xb-ease), padding-left .22s var(--xb-ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--xb-paper);
  border-left-color: var(--xb-mist);
}

.page-about .about-toc__link[aria-current="true"] {
  color: var(--xb-signal);
  border-left-color: var(--xb-signal);
  padding-left: 20px;
}

@media (min-width: 1000px) {
  .page-about .about-side {
    position: sticky;
    top: calc(var(--xb-header-h) + 24px);
  }
}

@media (max-width: 999px) {
  .page-about .about-side {
    position: sticky;
    top: var(--xb-header-h);
    z-index: 6;
    margin-inline: calc(-1 * var(--xb-gutter));
    padding: 10px var(--xb-gutter) 8px;
    background: rgba(10, 31, 26, .95);
    border-bottom: 1px solid var(--xb-line-soft);
  }

  .page-about .about-toc {
    border-top: 0;
    padding-top: 0;
  }

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

  .page-about .about-toc__list {
    display: flex;
    gap: 6px;
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }

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

  .page-about .about-toc__link {
    white-space: nowrap;
    padding: 6px 11px;
    border-left: 0;
    border-bottom: 2px solid transparent;
    background: var(--xb-panel);
    font-size: 13px;
  }

  .page-about .about-toc__link[aria-current="true"] {
    padding-left: 11px;
    border-bottom-color: var(--xb-signal);
    background: rgba(53, 242, 192, .1);
  }
}

/* ---------- 章节 ---------- */

.page-about .about-chapter {
  position: relative;
  padding-block: var(--about-chapter-space);
  border-top: 1px solid var(--xb-line-soft);
}

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

.page-about .about-chapter::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 44px;
  height: 2px;
  background: linear-gradient(90deg, var(--xb-signal), rgba(53, 242, 192, 0));
}

.page-about .about-chapter:first-child::after {
  display: none;
}

.page-about .about-kicker {
  display: block;
  margin-bottom: 12px;
  font-family: var(--xb-font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--xb-stone);
}

.page-about .about-chapter__title {
  margin: 0 0 clamp(16px, 2.4vw, 26px);
  font-family: var(--xb-font-display);
  font-weight: 700;
  font-size: clamp(25px, 3.4vw, 42px);
  line-height: 1.1;
  letter-spacing: -.005em;
  color: var(--xb-paper);
}

.page-about .about-p {
  margin: 0 0 16px;
  max-width: 68ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: rgba(243, 240, 231, .76);
}

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

/* ---------- 赛季时间轴 ---------- */

.page-about .about-timeline {
  margin-top: clamp(26px, 4vw, 46px);
}

.page-about .about-timeline__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 16px;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  top: 5px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(53, 242, 192, .8), rgba(102, 117, 111, .32));
}

.page-about .about-timeline__node {
  position: relative;
  min-width: 0;
  padding-top: 22px;
}

.page-about .about-timeline__dot {
  position: absolute;
  top: 0;
  left: 0;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--xb-signal);
  box-shadow: 0 0 0 4px rgba(53, 242, 192, .14);
  transition: transform .22s var(--xb-ease), box-shadow .22s var(--xb-ease);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--xb-font-display);
  font-size: 22px;
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--xb-paper);
}

.page-about .about-timeline__phase {
  display: block;
  margin: 4px 0 8px;
  font-family: var(--xb-font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--xb-mist);
}

.page-about .about-timeline__note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--xb-stone);
  transition: color .22s var(--xb-ease);
}

.page-about .about-timeline__node:hover .about-timeline__note,
.page-about .about-timeline__node:focus-within .about-timeline__note {
  color: rgba(243, 240, 231, .88);
}

.page-about .about-timeline__node:hover .about-timeline__dot,
.page-about .about-timeline__node:focus-within .about-timeline__dot {
  transform: scale(1.3);
  box-shadow: 0 0 0 7px rgba(53, 242, 192, .2);
}

@media (min-width: 720px) {
  .page-about .about-timeline__list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (max-width: 719px) {
  .page-about .about-timeline__list {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }

  .page-about .about-timeline__list::before {
    top: 0;
    bottom: 0;
    left: 5px;
    right: auto;
    width: 1px;
    height: auto;
    background: linear-gradient(180deg, rgba(53, 242, 192, .7), rgba(102, 117, 111, .28));
  }

  .page-about .about-timeline__node {
    padding: 0 0 24px 26px;
  }

  .page-about .about-timeline__dot {
    top: 4px;
  }
}

.page-about .about-timeline__figure {
  margin: clamp(24px, 3.6vw, 40px) 0 0;
}

/* ---------- 三条内容线 ---------- */

.page-about .about-lines {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: clamp(20px, 3vw, 34px);
}

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

.page-about .about-line {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px 22px 26px;
  background: var(--xb-panel);
  border-left: 3px solid var(--xb-stone);
  transition: box-shadow .24s var(--xb-ease), transform .24s var(--xb-ease);
}

.page-about .about-line:hover {
  box-shadow: inset 0 0 0 1px rgba(53, 242, 192, .18);
  transform: translateY(-3px);
}

.page-about .about-line--odds { border-left-color: var(--xb-signal); }
.page-about .about-line--transfer { border-left-color: var(--xb-red); }
.page-about .about-line--review { border-left-color: var(--xb-mist); }

.page-about .about-line__tag {
  font-family: var(--xb-font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--xb-signal);
}

.page-about .about-line--transfer .about-line__tag { color: var(--xb-red); }
.page-about .about-line--review .about-line__tag { color: var(--xb-mist); }

.page-about .about-line__title {
  margin: 0;
  font-family: var(--xb-font-display);
  font-weight: 700;
  font-size: clamp(19px, 2vw, 23px);
  line-height: 1.26;
  color: var(--xb-paper);
}

.page-about .about-line__text {
  margin: 0;
  max-width: none;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(243, 240, 231, .72);
}

.page-about .about-line__points {
  list-style: none;
  margin: auto 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--xb-line-soft);
  display: grid;
  gap: 8px;
}

.page-about .about-line__points li {
  position: relative;
  padding-left: 15px;
  font-size: 14px;
  line-height: 1.65;
  color: rgba(243, 240, 231, .68);
}

.page-about .about-line__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 7px;
  height: 1px;
  background: var(--xb-signal);
  opacity: .7;
}

.page-about .about-line--transfer .about-line__points li::before { background: var(--xb-red); }
.page-about .about-line--review .about-line__points li::before { background: var(--xb-mist); }

/* ---------- 规模数字 ---------- */

.page-about .about-scale {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(20px, 3vw, 34px) 0;
  background: var(--xb-line-soft);
  border: 1px solid var(--xb-line-soft);
}

@media (min-width: 780px) {
  .page-about .about-scale {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

.page-about .about-scale__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
  padding: clamp(18px, 2.4vw, 28px) clamp(14px, 1.8vw, 22px);
  background: var(--xb-ink);
}

.page-about .about-scale__num {
  font-family: var(--xb-font-mono);
  font-size: clamp(30px, 4.2vw, 50px);
  line-height: 1;
  letter-spacing: -.03em;
  font-variant-numeric: tabular-nums;
  color: var(--xb-signal);
}

.page-about .about-scale__unit {
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--xb-paper);
}

.page-about .about-scale__desc {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--xb-stone);
}

.page-about .about-banner {
  margin: clamp(22px, 3.4vw, 38px) 0 0;
}

/* ---------- 流程 ---------- */

.page-about .about-process {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 40px);
  margin-top: clamp(20px, 3vw, 32px);
}

@media (min-width: 900px) {
  .page-about .about-process {
    grid-template-columns: minmax(0, .72fr) minmax(0, 1fr);
    align-items: start;
  }
}

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

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

.page-about .about-process__step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-top: 1px solid var(--xb-line-soft);
}

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

.page-about .about-process__no {
  padding-top: 4px;
  font-family: var(--xb-font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--xb-signal);
}

.page-about .about-process__name {
  margin: 0 0 8px;
  font-family: var(--xb-font-display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: .01em;
  color: var(--xb-paper);
}

.page-about .about-process__body .about-p {
  font-size: 15.5px;
  margin-bottom: 0;
}

/* ---------- 团队条 ---------- */

.page-about .about-team {
  display: grid;
  gap: 18px;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "name count"
    "track track"
    "duty duty";
  gap: 8px 14px;
  align-items: center;
}

@media (min-width: 720px) {
  .page-about .about-team__row {
    grid-template-columns: 128px minmax(0, 1fr) 48px;
    grid-template-areas:
      "name track count"
      "duty duty duty";
  }
}

.page-about .about-team__name {
  grid-area: name;
  font-size: 15px;
  color: var(--xb-paper);
}

.page-about .about-team__track {
  grid-area: track;
  position: relative;
  height: 8px;
  background: rgba(102, 117, 111, .22);
  overflow: hidden;
}

.page-about .about-team__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, rgba(53, 242, 192, .42), var(--xb-signal));
  transition: filter .22s var(--xb-ease);
}

.page-about .about-team__row--review .about-team__fill { width: 77.8%; }
.page-about .about-team__row--edit .about-team__fill { width: 100%; }
.page-about .about-team__row--product .about-team__fill { width: 50%; }
.page-about .about-team__row--service .about-team__fill { width: 27.8%; }

.page-about .about-team__count {
  grid-area: count;
  font-family: var(--xb-font-mono);
  font-size: 20px;
  font-variant-numeric: tabular-nums;
  text-align: right;
  color: var(--xb-signal);
}

.page-about .about-team__duty {
  grid-area: duty;
  font-size: 13px;
  line-height: 1.6;
  color: var(--xb-stone);
  transition: color .22s var(--xb-ease);
}

.page-about .about-team__row:hover .about-team__duty {
  color: rgba(243, 240, 231, .82);
}

.page-about .about-team__row:hover .about-team__fill {
  filter: brightness(1.24);
}

/* ---------- 分歧处理 ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
  margin-top: clamp(18px, 2.6vw, 28px);
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .about-note {
  padding: 22px 22px 24px;
  border: 1px solid var(--xb-line);
  border-left: 3px solid var(--xb-gold);
  background: rgba(22, 51, 43, .62);
}

.page-about .about-note__k {
  display: block;
  margin-bottom: 12px;
  font-family: var(--xb-font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--xb-gold);
}

.page-about .about-note p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(243, 240, 231, .76);
}

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

.page-about .about-note__link {
  color: var(--xb-link);
  text-decoration: none;
  border-bottom: 1px solid rgba(89, 199, 216, .4);
  transition: color .2s var(--xb-ease), border-color .2s var(--xb-ease);
}

.page-about .about-note__link:hover,
.page-about .about-note__link:focus-visible {
  color: var(--xb-signal);
  border-bottom-color: var(--xb-signal);
}

/* ---------- 后续入口 ---------- */

.page-about .about-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(18px, 2.6vw, 30px);
  background: var(--xb-line-soft);
  border: 1px solid var(--xb-line-soft);
}

@media (min-width: 800px) {
  .page-about .about-next {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-next__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 6px 12px;
  padding: 22px 20px;
  background: var(--xb-ink);
  text-decoration: none;
  transition: background .22s var(--xb-ease);
}

.page-about .about-next__item:hover,
.page-about .about-next__item:focus-visible {
  background: var(--xb-panel);
}

.page-about .about-next__tag {
  grid-column: 1;
  font-family: var(--xb-font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--xb-signal);
}

.page-about .about-next__title {
  grid-column: 1;
  font-size: 15px;
  line-height: 1.6;
  color: var(--xb-paper);
}

.page-about .about-next__arrow {
  grid-column: 2;
  grid-row: 1 / span 2;
  font-size: 20px;
  color: var(--xb-stone);
  transition: color .22s var(--xb-ease), transform .22s var(--xb-ease);
}

.page-about .about-next__item:hover .about-next__arrow,
.page-about .about-next__item:focus-visible .about-next__arrow {
  color: var(--xb-signal);
  transform: translateX(4px);
}