.page-about {
  --ab-section-y: clamp(48px, 8vw, 104px);
  --ab-gap: clamp(20px, 3vw, 28px);
  display: block;
  color: var(--paper);
}

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

.page-about a {
  color: inherit;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 20px 0 4px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--slate);
}

.page-about .breadcrumbs a {
  text-decoration: none;
  color: var(--slate);
  border-bottom: 1px solid transparent;
  transition: color .16s ease, border-color .16s ease;
}

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

/* ---------- 按钮与徽章（页面内微调） ---------- */
.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  transition: transform .16s ease, background .18s ease, border-color .18s ease, color .18s ease;
}

.page-about .btn--primary {
  background: var(--orange);
  color: #16100a;
}

.page-about .btn--primary:hover,
.page-about .btn--primary:focus-visible {
  transform: translateY(-2px);
  background: #ff8c4d;
}

.page-about .btn--ghost {
  border-color: var(--line-strong);
  color: var(--paper);
  background: transparent;
}

.page-about .btn--ghost:hover,
.page-about .btn--ghost:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .pill,
.page-about .badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  line-height: 1.6;
  color: var(--slate);
}

.page-about .pill--cyan,
.page-about .badge--cyan {
  border-color: var(--line-strong);
  color: var(--cyan);
}

.page-about .badge--clay {
  border-color: rgba(196, 121, 90, .5);
  color: var(--clay);
}

.page-about .badge--yellow {
  border-color: rgba(255, 197, 61, .5);
  color: var(--yellow);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding: clamp(16px, 3vw, 36px) 0 clamp(40px, 6vw, 80px);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .eyebrow {
  margin: 0;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .ab-hero__title {
  margin: 14px 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 7vw, 58px);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.page-about .ab-hero__title-line {
  display: block;
}

.page-about .ab-hero__title-line--accent {
  color: var(--cyan);
  padding-left: 0.4em;
}

.page-about .ab-hero__lead {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 46ch;
  font-size: clamp(16px, 2.2vw, 18px);
  line-height: 1.75;
  color: rgba(244, 241, 232, .84);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  overflow: hidden;
}

.page-about .ab-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px;
  background: var(--panel);
}

.page-about .ab-fact__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1;
  letter-spacing: .01em;
  color: var(--cyan);
}

.page-about .ab-fact__suffix {
  font-size: .5em;
  margin-left: 2px;
}

.page-about .ab-fact__label {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--slate);
}

.page-about .ab-hero__media {
  margin-top: clamp(28px, 5vw, 56px);
}

/* ---------- 图片框 ---------- */
.page-about .media-frame {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  overflow: hidden;
  background: var(--panel);
}

.page-about .media-frame img {
  width: 100%;
  object-fit: cover;
}

.page-about .media-frame--wide img {
  aspect-ratio: 16 / 9;
}

.page-about .media-frame--4x3 img {
  aspect-ratio: 4 / 3;
}

.page-about .media-frame__caption {
  padding: 10px 16px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--slate);
}

/* ---------- 编号章节骨架 ---------- */
.page-about .ab-chapter {
  padding: var(--ab-section-y) 0;
}

.page-about .ab-chapter__grid {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-chapter__num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(44px, 8vw, 78px);
  line-height: .92;
  letter-spacing: -0.02em;
  color: rgba(53, 224, 224, .3);
}

@supports (-webkit-text-stroke: 1px red) {
  .page-about .ab-chapter__num {
    color: transparent;
    -webkit-text-stroke: 1px rgba(53, 224, 224, .52);
  }
}

.page-about .ab-chapter__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(21px, 2.8vw, 30px);
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.page-about .ab-chapter__note {
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid var(--line-warm);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--slate);
}

.page-about .ab-lead {
  margin: 0 0 clamp(22px, 3vw, 32px);
  max-width: 62ch;
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.8;
  color: rgba(244, 241, 232, .86);
}

/* ---------- 时间线 ---------- */
.page-about .ab-timeline {
  position: relative;
  margin: 0;
  padding: 4px 0 4px 28px;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(53, 224, 224, .05));
}

.page-about .ab-timeline__item {
  position: relative;
}

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 21px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--cyan);
}

.page-about .ab-stage__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--panel);
  cursor: pointer;
  list-style: none;
  transition: border-color .18s ease, background .18s ease;
}

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

.page-about .ab-stage__summary:hover {
  border-color: var(--line-strong);
  background: #10202f;
}

.page-about .ab-stage__name {
  flex: 1 1 200px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .ab-stage__time {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--slate);
}

.page-about .ab-stage__summary::after {
  content: "＋";
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--cyan);
}

.page-about .ab-stage[open] .ab-stage__summary {
  border-color: var(--line-strong);
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
}

.page-about .ab-stage[open] .ab-stage__summary::after {
  content: "－";
}

.page-about .ab-stage__body {
  padding: 14px 18px 18px;
  border: 1px solid var(--line-strong);
  border-top: none;
  border-radius: 0 0 var(--radius-m) var(--radius-m);
  background: rgba(14, 27, 46, .7);
}

.page-about .ab-stage__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 241, 232, .76);
}

/* ---------- 色带 ---------- */
.page-about .ab-band {
  padding: clamp(34px, 7vw, 68px) 0;
  background: var(--panel);
  clip-path: polygon(0 6%, 100% 0, 100% 94%, 0 100%);
}

.page-about .ab-band--clay {
  background:
    linear-gradient(100deg, rgba(196, 121, 90, .28), rgba(14, 27, 46, 0) 64%),
    var(--panel);
}

.page-about .ab-band--moss {
  background:
    linear-gradient(100deg, rgba(134, 185, 143, .24), rgba(14, 27, 46, 0) 64%),
    var(--panel);
}

.page-about .ab-band__text {
  margin: 0;
  max-width: 30ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(18px, 3.2vw, 30px);
  line-height: 1.4;
  letter-spacing: -0.01em;
}

/* ---------- 团队 ---------- */
.page-about .ab-team-layout {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-team-cards {
  display: grid;
  gap: 16px;
}

.page-about .ab-team {
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  background: linear-gradient(160deg, rgba(53, 224, 224, .08), rgba(14, 27, 46, .92) 58%);
}

.page-about .ab-team__num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(28px, 4.4vw, 40px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .ab-team__unit {
  margin-left: 8px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--slate);
}

.page-about .ab-team__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  line-height: 1.45;
}

.page-about .ab-team__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 241, 232, .76);
}

.page-about .ab-team__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-team__tags li {
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--slate);
}

.page-about .ab-team__more {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 241, 232, .7);
}

/* ---------- 覆盖范围 ---------- */
.page-about .ab-coverage-layout {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-coverage__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .ab-coverage__tabs {
  display: inline-flex;
  gap: 4px;
  margin-bottom: 20px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: var(--panel);
}

.page-about .ab-coverage__tabs label {
  padding: 8px 22px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 700;
  color: var(--slate);
  cursor: pointer;
  transition: background .18s ease, color .18s ease;
}

.page-about .ab-coverage__tabs label:hover {
  color: var(--paper);
}

.page-about #ab-cov-football:checked ~ .ab-coverage__tabs label[for="ab-cov-football"],
.page-about #ab-cov-basketball:checked ~ .ab-coverage__tabs label[for="ab-cov-basketball"] {
  background: var(--cyan);
  color: #06121c;
}

.page-about .ab-coverage__radio:focus-visible ~ .ab-coverage__tabs label {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .ab-coverage__panel {
  display: none;
}

.page-about #ab-cov-football:checked ~ .ab-coverage__panels .ab-coverage__panel--football,
.page-about #ab-cov-basketball:checked ~ .ab-coverage__panels .ab-coverage__panel--basketball {
  display: block;
}

.page-about .ab-coverage__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .ab-coverage__list li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(244, 241, 232, .84);
}

.page-about .ab-coverage__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--orange);
}

/* ---------- 数据来源 ---------- */
.page-about .ab-flow {
  margin: 0 0 clamp(24px, 3vw, 36px);
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .ab-flow__step {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius-m);
  background: var(--panel);
}

.page-about .ab-flow__idx {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .ab-flow__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 16px;
  line-height: 1.4;
}

.page-about .ab-flow__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 241, 232, .74);
}

.page-about .ab-why {
  display: grid;
  gap: 14px;
}

.page-about .ab-why__card {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  background: rgba(14, 27, 46, .6);
}

.page-about .ab-why__title {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 16px;
  line-height: 1.45;
}

.page-about .ab-why__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 241, 232, .74);
}

/* ---------- 旧版本快照 ---------- */
.page-about .ab-archive {
  padding: clamp(22px, 3vw, 32px);
  border: 1px solid rgba(196, 121, 90, .38);
  border-radius: var(--radius-l);
  background: linear-gradient(140deg, rgba(196, 121, 90, .16), rgba(14, 27, 46, .9) 62%);
}

.page-about .ab-archive__title {
  margin: 14px 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(18px, 2.4vw, 22px);
  line-height: 1.35;
}

.page-about .ab-archive__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
}

.page-about .ab-archive__list li {
  padding: 13px 0;
  border-top: 1px solid rgba(138, 151, 168, .2);
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 241, 232, .82);
}

.page-about .ab-archive__foot {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
}

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

.page-about .ab-archive__foot a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 品牌叙述 ---------- */
.page-about .ab-statement {
  padding: var(--ab-section-y) 0;
  background:
    linear-gradient(180deg, rgba(53, 224, 224, .07), rgba(7, 16, 31, 0) 70%);
}

.page-about .ab-statement__inner {
  display: grid;
  gap: 18px;
}

.page-about .ab-chapter__num--wide {
  font-size: clamp(48px, 9vw, 92px);
  margin: 0;
}

.page-about .ab-statement__title {
  margin: 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.page-about .ab-statement__text {
  margin: 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.8vw, 18px);
  line-height: 1.85;
  color: rgba(244, 241, 232, .84);
}

.page-about .ab-audience {
  margin: clamp(8px, 2vw, 20px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .ab-audience__item {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  background: rgba(14, 27, 46, .62);
}

.page-about .ab-audience__tag {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--orange);
}

.page-about .ab-audience__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 241, 232, .78);
}

/* ---------- 合作入口 ---------- */
.page-about .ab-partner {
  display: grid;
  gap: 14px;
}

.page-about .ab-partner__card {
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  background: var(--panel);
  transition: border-color .18s ease, transform .18s ease;
}

.page-about .ab-partner__card:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.page-about .ab-partner__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  line-height: 1.4;
}

.page-about .ab-partner__text {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 241, 232, .76);
}

.page-about .ab-partner__link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}

.page-about .ab-partner__link:hover {
  border-bottom-color: var(--cyan);
}

.page-about .ab-cta {
  margin-top: clamp(20px, 3vw, 32px);
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--line-warm);
  border-radius: var(--radius-l);
  background: linear-gradient(120deg, rgba(255, 122, 47, .14), rgba(14, 27, 46, .85) 68%);
  display: grid;
  gap: 16px;
}

.page-about .ab-cta__text {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(17px, 2.4vw, 22px);
  line-height: 1.4;
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

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

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

@media (min-width: 940px) {
  .page-about .ab-chapter__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: 24px;
    row-gap: 0;
  }

  .page-about .ab-chapter__head {
    grid-column: 1 / span 3;
    align-self: start;
    position: sticky;
    top: 108px;
  }

  .page-about .ab-chapter__body {
    grid-column: 4 / span 9;
    min-width: 0;
  }

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

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

  .page-about .ab-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 1000px) {
  .page-about .ab-team-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .ab-coverage-layout {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }
}

@media (hover: hover) and (min-width: 1000px) {
  .page-about .ab-team__more {
    max-height: 0;
    margin-top: 0;
    padding-top: 0;
    overflow: hidden;
    opacity: 0;
    border-top-color: transparent;
    transition: max-height .28s ease, opacity .24s ease, margin-top .28s ease, padding-top .28s ease;
  }

  .page-about .ab-team:hover .ab-team__more {
    max-height: 180px;
    margin-top: 16px;
    padding-top: 14px;
    opacity: 1;
    border-top-color: var(--line);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .btn,
  .page-about .ab-partner__card,
  .page-about .ab-stage__summary,
  .page-about .ab-team__more {
    transition: none;
  }

  .page-about .btn--primary:hover,
  .page-about .btn--primary:focus-visible,
  .page-about .ab-partner__card:hover {
    transform: none;
  }
}