.page-about {
  --ab-gap: clamp(52px, 8vw, 100px);
}

/* ---------- 面包屑与首屏 ---------- */

.page-about .breadcrumb {
  padding-top: 22px;
}

.page-about .about-hero {
  position: relative;
  padding: 30px 0 8px;
  display: grid;
  gap: 30px;
}

.page-about .about-hero__inner {
  max-width: 46em;
}

.page-about .about-hero .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .page-head__title {
  margin: 12px 0 0;
  font-size: clamp(31px, 8vw, 54px);
  line-height: 1.14;
  letter-spacing: -.015em;
  color: var(--text-strong);
}

.page-about .page-head__lede {
  margin: 16px 0 0;
  max-width: 40em;
  font-size: clamp(16px, 3.8vw, 18px);
  line-height: 1.78;
  color: var(--text);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 24px 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 22px 18px;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-left: 14px;
  border-left: 2px solid var(--blue);
}

.page-about .about-hero__stats li:nth-child(2) {
  border-left-color: var(--orange);
}

.page-about .about-hero__stats li:nth-child(3) {
  border-left-color: var(--cyan);
}

.page-about .about-hero__stats .num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 9vw, 46px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--lime);
}

.page-about .about-hero__stats li:nth-child(2) .num {
  color: var(--blue-soft);
}

.page-about .about-hero__stats li:nth-child(3) .num {
  color: var(--cyan);
}

.page-about .about-hero__label {
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-dim);
}

@media (min-width: 980px) {
  .page-about .about-hero::after {
    content: "";
    position: absolute;
    top: 6px;
    bottom: 14px;
    right: 0;
    width: 1px;
    background: repeating-linear-gradient(180deg, var(--line-strong) 0 10px, transparent 10px 22px);
  }

  .page-about .about-hero__stats {
    gap: 22px 32px;
  }
}

/* ---------- 章节标题补充 ---------- */

.page-about .section-head__sub {
  margin: 8px 0 0;
  font-size: 15px;
  color: var(--text-dim);
}

/* ---------- 图片统一处理 ---------- */

.page-about .about-figure {
  margin: 0;
  overflow: visible;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  object-fit: cover;
}

.page-about .img-frame__caption {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .03em;
  color: var(--text-dim);
}

/* ---------- 01 时间线 ---------- */

.page-about #milestones .about-figure {
  margin-top: 28px;
}

.page-about .tl {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  border-top: 2px solid var(--line-strong);
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .tl::-webkit-scrollbar {
  height: 6px;
}

.page-about .tl::-webkit-scrollbar-thumb {
  background: var(--line-strong);
  border-radius: 3px;
}

.page-about .tl__item {
  position: relative;
  flex: 0 0 auto;
  width: min(272px, 76vw);
  padding: 28px 22px 10px 0;
  scroll-snap-align: start;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 0;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--blue);
}

.page-about .tl__item::after {
  content: "";
  position: absolute;
  top: 4px;
  bottom: 0;
  left: 5px;
  width: 1px;
  background: repeating-linear-gradient(180deg, var(--line) 0 4px, transparent 4px 13px);
  opacity: .75;
}

.page-about .tl__item:nth-child(2)::before {
  border-color: var(--blue-soft);
}

.page-about .tl__item:nth-child(3)::before {
  border-color: var(--amber);
}

.page-about .tl__item:nth-child(4)::before {
  border-color: var(--cyan);
}

.page-about .tl__item:nth-child(5)::before {
  border-color: var(--lime);
}

.page-about .tl__summary {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding-right: 26px;
  list-style: none;
  cursor: pointer;
  color: inherit;
}

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

.page-about .tl__summary::after {
  content: "+";
  position: absolute;
  top: 0;
  right: 0;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--text-dim);
  transition: transform .22s var(--ease), color .22s var(--ease);
}

.page-about .tl__node[open] .tl__summary::after {
  transform: rotate(45deg);
  color: var(--blue-soft);
}

.page-about .tl__summary:hover .tl__title {
  color: var(--blue-soft);
}

.page-about .tl__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .tl__title {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text-strong);
  transition: color .22s var(--ease);
}

.page-about .tl__body {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.78;
  color: var(--text);
}

/* ---------- 02 数据来源 ---------- */

.page-about .src-grid {
  margin-top: 30px;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .src-card {
  display: grid;
  gap: 9px;
  align-content: start;
  padding: 24px 22px;
  background: var(--ink-800);
  transition: background-color .22s var(--ease);
}

.page-about .src-card:hover {
  background: var(--ink-700);
}

.page-about .src-card p.src-card__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1;
  letter-spacing: .16em;
  color: var(--blue-soft);
}

.page-about .src-card__t {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text-strong);
}

.page-about .src-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text);
}

.page-about .src-body {
  margin-top: 36px;
  display: grid;
  gap: 26px;
}

.page-about .src-body__text h3 {
  margin: 0 0 14px;
  font-size: clamp(19px, 4.4vw, 23px);
  line-height: 1.4;
  color: var(--text-strong);
}

.page-about .src-body__text p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.82;
  color: var(--text);
}

.page-about .pipe {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .pipe__step {
  position: relative;
  display: grid;
  grid-template-columns: 44px 1fr;
  grid-template-rows: auto auto;
  gap: 4px 10px;
  padding: 15px 18px 15px 20px;
  background: var(--ink-800);
}

.page-about .pipe__step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--accent, var(--blue));
}

.page-about .pipe__step:nth-child(1) {
  --accent: var(--blue);
}

.page-about .pipe__step:nth-child(2) {
  --accent: var(--blue-soft);
}

.page-about .pipe__step:nth-child(3) {
  --accent: var(--amber);
}

.page-about .pipe__step:nth-child(4) {
  --accent: var(--lime);
}

.page-about .pipe__n {
  grid-column: 1;
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: .1em;
  color: var(--blue-soft);
}

.page-about .pipe__t {
  grid-column: 2;
  grid-row: 1;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text-strong);
}

.page-about .pipe__d {
  grid-column: 2;
  grid-row: 2;
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-dim);
}

@media (min-width: 780px) {
  .page-about .src-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .src-body {
    grid-template-columns: 1.05fr 1fr;
    gap: 42px;
    align-items: start;
  }
}

/* ---------- 03 分工矩阵 ---------- */

.page-about .prose {
  margin-top: 26px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .matrix {
  margin-top: 30px;
  border-top: 1px solid var(--line-strong);
}

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

.page-about .matrix__row {
  position: relative;
  display: grid;
  gap: 8px;
  padding: 20px 12px 20px 18px;
  border-bottom: 1px solid var(--line);
  border-left: 3px solid var(--accent, var(--blue));
  transition: background-color .22s var(--ease);
}

.page-about .matrix__row:hover {
  background: rgba(46, 125, 255, .07);
}

.page-about .matrix__row.is-football {
  --accent: var(--blue);
}

.page-about .matrix__row.is-basketball {
  --accent: var(--orange);
}

.page-about .matrix__row.is-tennis {
  --accent: var(--cyan);
}

.page-about .matrix__row.is-cup {
  --accent: var(--lime);
}

.page-about .matrix__name {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--text-strong);
}

.page-about .matrix__col {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
}

@media (min-width: 860px) {
  .page-about .matrix__head {
    display: grid;
    grid-template-columns: 1.05fr 1.6fr 1.35fr;
    gap: 26px;
    padding: 0 12px 12px 18px;
    border-bottom: 1px solid var(--line-strong);
  }

  .page-about .matrix__head span {
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: .12em;
    color: var(--cyan);
  }

  .page-about .matrix__row {
    grid-template-columns: 1.05fr 1.6fr 1.35fr;
    gap: 26px;
    align-items: baseline;
  }
}

/* ---------- 04 赛季节奏 ---------- */

.page-about .phases {
  list-style: none;
  position: relative;
  margin: 34px 0 0;
  padding: 0 0 0 32px;
}

.page-about .phases::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 26px;
  width: 2px;
  background: linear-gradient(180deg, var(--blue) 0%, var(--cyan) 50%, var(--orange) 100%);
  opacity: .7;
}

.page-about .phase {
  position: relative;
  padding: 0 0 34px;
}

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

.page-about .phase::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--blue);
}

.page-about .phase:nth-child(2)::before {
  border-color: var(--cyan);
}

.page-about .phase:nth-child(3)::before {
  border-color: var(--orange);
}

.page-about .phase__k {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--text-dim);
}

.page-about .phase h3 {
  margin: 0 0 10px;
  font-size: clamp(18px, 4.2vw, 21px);
  line-height: 1.45;
  color: var(--text-strong);
}

.page-about .phase p {
  margin: 0;
  max-width: 44em;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--text);
}

/* ---------- 05 服务对象 ---------- */

.page-about .audience {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .audience__item {
  display: grid;
  gap: 9px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.page-about .audience__item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .audience__who {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text-strong);
}

.page-about .audience__who::before {
  content: "";
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  transform: translateY(-3px);
}

.page-about .audience__what {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text);
}

.page-about .audience__what a,
.page-about .audience__foot a {
  color: var(--blue-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .audience__what a:hover,
.page-about .audience__foot a:hover {
  color: var(--cyan);
}

.page-about .audience__foot {
  margin: 26px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--lime);
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dim);
}

@media (min-width: 860px) {
  .page-about .audience__item {
    grid-template-columns: 220px 1fr;
    gap: 34px;
    align-items: start;
  }

  .page-about .audience__who {
    font-size: 18px;
  }
}

/* ---------- 06 运营地区 ---------- */

.page-about .region {
  margin-top: 30px;
  display: grid;
  gap: 26px;
}

.page-about .region__text p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.82;
  color: var(--text);
}

.page-about .region__text p:last-of-type {
  margin-bottom: 0;
}

.page-about .about-cta {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (min-width: 900px) {
  .page-about .region {
    grid-template-columns: 1.1fr 1fr;
    gap: 44px;
    align-items: center;
  }
}

/* ---------- 窄屏收口 ---------- */

@media (max-width: 420px) {
  .page-about .about-hero__stats {
    grid-template-columns: 1fr;
  }

  .page-about .pipe__step {
    grid-template-columns: 36px 1fr;
    padding: 14px 14px 14px 16px;
  }

  .page-about .about-cta .btn {
    flex: 1 1 auto;
  }
}