.page-about {
  --about-hair: rgba(29, 53, 87, 0.12);
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: clip;
}

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

.page-about .about-crumbs {
  padding-top: 1.1rem;
  padding-bottom: 0.4rem;
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--midnight);
  color: var(--cream);
  padding: clamp(1.5rem, 4vw, 2.5rem) 0 clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.32;
  z-index: -2;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, rgba(20, 33, 61, 0.95) 0%, rgba(20, 33, 61, 0.78) 54%, rgba(29, 53, 87, 0.42) 100%);
  z-index: -1;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -20%;
  right: -24%;
  width: 60%;
  height: 155%;
  background: linear-gradient(150deg, rgba(230, 57, 70, 0.55), rgba(244, 162, 97, 0.14) 60%, transparent 78%);
  transform: rotate(-16deg);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero__inner {
  position: relative;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.page-about .about-hero__eyebrow {
  margin: 0;
  color: var(--gold-soft);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0.7rem 0 0;
  max-width: 20ch;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5.4vw, 3.5rem);
  line-height: 1.08;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lede {
  margin: 1.1rem 0 0;
  max-width: 60ch;
  font-size: clamp(0.98rem, 1.6vw, 1.08rem);
  line-height: 1.85;
  color: rgba(255, 248, 240, 0.86);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 1.9rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.1rem 0.9rem;
  max-width: 660px;
}

.page-about .about-hero__facts li {
  border-left: 2px solid rgba(244, 162, 97, 0.55);
  padding-left: 0.7rem;
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 2.4vw, 1.7rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--gold-soft);
}

.page-about .about-fact__label {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: rgba(255, 248, 240, 0.72);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

/* 主体：索引 + 内容 */
.page-about .about-body {
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 3.75rem) var(--gutter);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
}

.page-about .about-index__label {
  margin: 0 0 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--red);
  text-transform: uppercase;
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0.35rem;
  display: flex;
  gap: 0.4rem;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  white-space: nowrap;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--about-hair);
  border-radius: 999px;
  background: #fff;
  color: var(--ink);
  text-decoration: none;
  font-size: 0.85rem;
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  background: var(--red);
  border-color: var(--red);
  color: #fff;
}

.page-about .about-index__idx {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .about-index__link:hover .about-index__idx,
.page-about .about-index__link:focus-visible .about-index__idx {
  color: var(--gold-soft);
}

/* 章节 */
.page-about .about-sec {
  scroll-margin-top: calc(var(--head-h) + 1.5rem);
  padding: clamp(1.75rem, 3.5vw, 2.5rem) 0;
  border-top: 1px solid var(--about-hair);
}

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

.page-about .about-sec__num {
  margin: 0 0 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--red);
}

.page-about .about-sec__title {
  margin: 0 0 0.9rem;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.6vw, 1.9rem);
  line-height: 1.28;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-sec p {
  margin: 0 0 0.9rem;
  max-width: 68ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--graphite);
}

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

.page-about .about-quote {
  margin: 1.5rem 0 0;
  padding: 1.1rem 1.25rem;
  border-left: 4px solid var(--red);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: linear-gradient(100deg, rgba(255, 216, 168, 0.42), rgba(255, 248, 240, 0));
}

.page-about .about-quote p {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-quote cite {
  display: block;
  margin-top: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.73rem;
  letter-spacing: 0.08em;
  font-style: normal;
  color: var(--red);
}

/* 时间轴 */
.page-about .about-timeline {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0 0 0 1.5rem;
  border-left: 2px solid rgba(230, 57, 70, 0.28);
}

.page-about .about-node {
  position: relative;
  padding-bottom: 1.05rem;
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: calc(-1.5rem - 8px);
  top: 0.6rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--red);
  box-shadow: 0 0 0 4px rgba(230, 57, 70, 0.14);
}

.page-about .about-node summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.3rem 0.65rem;
  cursor: pointer;
  list-style: none;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.55;
  color: var(--ink);
}

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

.page-about .about-node summary::after {
  content: "+";
  margin-left: auto;
  padding-left: 0.5rem;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--red);
}

.page-about .about-node details[open] summary::after {
  content: "−";
}

.page-about .about-node summary:focus-visible {
  outline: 2px solid var(--red);
  outline-offset: 3px;
}

.page-about .about-node__year {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--red);
}

.page-about .about-node__name {
  flex: 1 1 12rem;
  min-width: 0;
}

.page-about .about-node__body {
  margin-top: 0.55rem;
}

.page-about .about-node__body p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--graphite);
}

/* 团队统计与图 */
.page-about .about-stats {
  list-style: none;
  margin: 1.4rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 0.75rem;
}

.page-about .about-stat {
  background: #fff;
  border: 1px solid var(--about-hair);
  border-top: 3px solid var(--gold);
  border-radius: 10px;
  padding: 0.85rem 0.9rem;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--ink);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--graphite);
}

.page-about .about-figure {
  margin: 1.5rem 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
}

.page-about .about-figure figcaption {
  margin-top: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.71rem;
  letter-spacing: 0.06em;
  color: var(--graphite);
}

/* 合作筛选与卡片 */
.page-about .about-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.4rem;
}

.page-about .about-filters .filter-btn {
  font: inherit;
  font-size: 0.85rem;
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--about-hair);
  border-radius: 999px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  transition: background 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-filters .filter-btn:hover,
.page-about .about-filters .filter-btn:focus-visible {
  border-color: var(--red);
  color: var(--red);
}

.page-about .about-filters .filter-btn[aria-pressed="true"] {
  background: var(--red);
  border-color: var(--red);
  color: #fff;
}

.page-about .filter-count {
  margin: 0.8rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--graphite);
}

.page-about .about-cards {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.85rem;
}

.page-about .about-card {
  position: relative;
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--about-hair);
  border-radius: 12px;
  padding: 1rem 1.05rem 1.05rem 1.2rem;
  box-shadow: var(--shadow-sm);
}

.page-about .about-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--ink);
}

.page-about .about-card[data-topic*="场馆运营方"]::before {
  background: var(--red);
}

.page-about .about-card[data-topic*="城市体育协会"]::before {
  background: var(--gold);
}

.page-about .about-card[data-topic*="赛事数据服务商"]::before {
  background: var(--teal);
}

.page-about .about-card__title {
  margin: 0.55rem 0 0.35rem;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-card__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--graphite);
}

/* 本地信息 */
.page-about .about-local {
  margin-top: 1.4rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.75rem;
}

.page-about .about-local__item {
  background: var(--mist);
  border-left: 3px solid var(--ink);
  border-radius: 0 10px 10px 0;
  padding: 0.85rem 1rem;
}

.page-about .about-local__k {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.71rem;
  letter-spacing: 0.12em;
  color: var(--red);
}

.page-about .about-local__v {
  margin: 0.32rem 0 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--ink);
  word-break: break-word;
}

/* 服务原则 */
.page-about .about-principles {
  margin-top: 1.4rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.85rem;
}

.page-about .about-principle {
  position: relative;
  background: #fff;
  border: 1px solid var(--about-hair);
  border-radius: 12px;
  padding: 1.05rem;
}

.page-about .about-principle__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  background: var(--red);
  color: #fff;
}

.page-about .about-principle__title {
  margin: 0.6rem 0 0.35rem;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-principle__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--graphite);
}

/* 延伸入口 */
.page-about .about-next {
  background: var(--midnight);
  color: var(--cream);
  padding: clamp(2.25rem, 5vw, 3.5rem) 0;
}

.page-about .about-next__inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.page-about .about-next__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 2.4vw, 1.75rem);
  font-weight: 800;
  line-height: 1.3;
  color: var(--cream);
}

.page-about .about-next__grid {
  margin-top: 1.4rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.8rem;
}

.page-about .about-next__card {
  display: block;
  padding: 0.95rem 1rem;
  border: 1px solid rgba(255, 248, 240, 0.18);
  border-radius: 12px;
  background: rgba(255, 248, 240, 0.06);
  color: var(--cream);
  text-decoration: none;
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  background: rgba(230, 57, 70, 0.2);
  border-color: rgba(244, 162, 97, 0.6);
  transform: translateY(-2px);
}

.page-about .about-next__k {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.71rem;
  letter-spacing: 0.14em;
  color: var(--gold-soft);
}

.page-about .about-next__name {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--cream);
}

/* 中等屏幕 */
@media (min-width: 640px) {
  .page-about .about-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 760px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

/* 桌面：索引吸顶 + 主栏加宽 */
@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--head-h) + 1.25rem);
    padding-top: 0.25rem;
  }

  .page-about .about-index__list {
    flex-direction: column;
    overflow: visible;
    gap: 0.2rem;
    padding-bottom: 0;
  }

  .page-about .about-index__link {
    display: flex;
    width: 100%;
    white-space: normal;
    border-radius: 0 8px 8px 0;
    border-left: 3px solid transparent;
    background: transparent;
    padding: 0.45rem 0.6rem;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    background: rgba(230, 57, 70, 0.08);
    border-color: transparent;
    border-left-color: var(--red);
    color: var(--red);
  }
}

@media (min-width: 1060px) {
  .page-about .about-next__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
<<<END>>>