/* ============================================================
   B体育 · 品牌与数据历程（/about/）
   页面作用域：.page-about
   ============================================================ */

.page-about {
  --ab-rail: 148px;
  --ab-amber-soft: rgba(255, 169, 40, 0.16);
  --ab-green-soft: rgba(57, 255, 136, 0.12);
  color: var(--bs-ink);
}

/* ---------------- 首屏 ---------------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(52px, 9vw, 128px) 0 clamp(42px, 7vw, 92px);
  background:
    radial-gradient(880px 420px at 84% -12%, rgba(57, 255, 136, 0.1), transparent 62%),
    radial-gradient(720px 380px at -8% 108%, rgba(255, 169, 40, 0.08), transparent 60%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(90deg, rgba(27, 58, 92, 0.45) 1px, transparent 1px);
  background-size: 96px 100%;
  opacity: 0.55;
  -webkit-mask-image: linear-gradient(180deg, #000, transparent 88%);
  mask-image: linear-gradient(180deg, #000, transparent 88%);
}

.page-about .about-hero .bs-shell {
  position: relative;
  z-index: 1;
}

.page-about .bs-crumbs {
  font-family: var(--bs-font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--bs-muted);
  margin-bottom: clamp(22px, 4vw, 40px);
}

.page-about .bs-crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .bs-crumbs a {
  color: var(--bs-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--bs-ease), border-color 0.25s var(--bs-ease);
}

.page-about .bs-crumbs a:hover,
.page-about .bs-crumbs a:focus-visible {
  color: var(--bs-green);
  border-bottom-color: var(--bs-green);
}

.page-about .bs-crumbs__sep {
  color: var(--bs-line);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 44px);
}

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

.page-about .about-hero h1 {
  font-family: var(--bs-font-display);
  font-weight: 800;
  letter-spacing: 0.02em;
  line-height: 1.04;
  font-size: clamp(1.85rem, 7vw, 4.2rem);
  margin: 0.3em 0 0.45em;
  max-width: 17ch;
}

.page-about .about-hero .bs-lede {
  max-width: 60ch;
  font-size: clamp(0.98rem, 2.3vw, 1.1rem);
  line-height: 1.8;
  color: var(--bs-muted);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(128px, 1fr));
  gap: 16px 18px;
  margin-top: clamp(26px, 4vw, 44px);
  padding-top: clamp(18px, 3vw, 28px);
  border-top: 1px solid var(--bs-line-soft);
}

.page-about .about-hero__stats .bs-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-hero__stats .bs-stat__value {
  font-family: var(--bs-font-mono);
  font-size: clamp(1.35rem, 3.4vw, 1.95rem);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--bs-green);
}

.page-about .about-hero__stats .bs-stat__label {
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--bs-muted);
}

.page-about .about-hero__stats .bs-stat--amber .bs-stat__value {
  color: var(--bs-amber);
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-hero__rail {
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding-top: 10px;
  }

  .page-about .ab-rail__row {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--bs-font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.08em;
    color: var(--bs-muted);
  }

  .page-about .ab-rail__row::after {
    content: "";
    flex: 1;
    height: 1px;
    background: var(--bs-line);
  }

  .page-about .ab-rail__row--now {
    color: var(--bs-green);
  }

  .page-about .ab-rail__row--now::after {
    background: linear-gradient(90deg, var(--bs-green), transparent);
  }
}

/* ---------------- 通用章节 ---------------- */

.page-about .about-section {
  position: relative;
  padding: clamp(50px, 8vw, 108px) 0;
  border-top: 1px solid var(--bs-line-soft);
}

.page-about .about-section h2 {
  font-family: var(--bs-font-display);
  font-weight: 800;
  letter-spacing: 0.02em;
  line-height: 1.12;
  font-size: clamp(1.45rem, 4.6vw, 2.6rem);
  margin: 0.35em 0 0.5em;
  max-width: 24ch;
}

.page-about .about-section h3 {
  font-family: var(--bs-font-display);
  font-weight: 800;
  letter-spacing: 0.02em;
  font-size: 1.05rem;
  margin: 0;
}

.page-about .about-section p {
  line-height: 1.8;
  max-width: 62ch;
}

.page-about .about-section p + p {
  margin-top: 1em;
}

.page-about .about-section a {
  color: var(--bs-green);
  text-decoration: none;
  border-bottom: 1px solid rgba(57, 255, 136, 0.35);
  transition: color 0.25s var(--bs-ease), border-color 0.25s var(--bs-ease);
}

.page-about .about-section a:hover,
.page-about .about-section a:focus-visible {
  color: var(--bs-green-soft);
  border-bottom-color: var(--bs-green-soft);
}

.page-about .bs-section__head {
  margin-bottom: clamp(26px, 4vw, 46px);
}

.page-about .bs-section__head .bs-lede {
  color: var(--bs-muted);
  max-width: 58ch;
}

/* ---------------- 媒体块 ---------------- */

.page-about .about-media {
  position: relative;
  margin: 0;
  border: 1px solid var(--bs-line);
  border-radius: var(--bs-radius);
  overflow: hidden;
  background: linear-gradient(160deg, var(--bs-panel), var(--bs-deep));
}

.page-about .about-media::after {
  content: "";
  position: absolute;
  top: 14px;
  left: 14px;
  width: 44px;
  height: 3px;
  background: var(--bs-amber);
  opacity: 0.9;
}

.page-about .about-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 2;
  filter: saturate(0.85) contrast(1.05);
}

.page-about .about-media--tall img {
  aspect-ratio: 10 / 7;
}

.page-about .about-media__cap {
  display: block;
  padding: 12px 16px 14px;
  font-family: var(--bs-font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--bs-amber);
  border-top: 1px solid var(--bs-line-soft);
  background: rgba(5, 10, 20, 0.6);
}

/* ---------------- 品牌起点 ---------------- */

.page-about .origin__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
}

@media (min-width: 900px) {
  .page-about .origin__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .origin__media {
    margin-top: clamp(18px, 3vw, 44px);
  }
}

/* ---------------- 时间轴 ---------------- */

.page-about .tl {
  position: relative;
  margin-top: clamp(8px, 2vw, 16px);
}

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

.page-about .tl__tabs {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: none;
}

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

.page-about .tl__tab {
  flex: 0 0 auto;
  min-width: 158px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 12px 18px;
  cursor: pointer;
  border: 1px solid var(--bs-line);
  border-radius: 999px;
  background: var(--bs-panel);
  color: var(--bs-muted);
  transition: color 0.3s var(--bs-ease), background 0.3s var(--bs-ease),
    border-color 0.3s var(--bs-ease);
}

.page-about .tl__tab-range {
  font-family: var(--bs-font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.05em;
}

.page-about .tl__tab-name {
  font-size: 0.78rem;
  letter-spacing: 0.02em;
}

.page-about .tl__tab:hover {
  color: var(--bs-ink);
  border-color: var(--bs-green-soft);
}

.page-about .tl__radio:focus-visible ~ .tl__tabs .tl__tab {
  outline: none;
}

.page-about .tl__radio--1:checked ~ .tl__tabs .tl__tab--1,
.page-about .tl__radio--2:checked ~ .tl__tabs .tl__tab--2,
.page-about .tl__radio--3:checked ~ .tl__tabs .tl__tab--3 {
  background: var(--bs-green);
  border-color: var(--bs-green);
  color: var(--bs-green-ink);
}

.page-about .tl__radio--1:focus-visible ~ .tl__tabs .tl__tab--1,
.page-about .tl__radio--2:focus-visible ~ .tl__tabs .tl__tab--2,
.page-about .tl__radio--3:focus-visible ~ .tl__tabs .tl__tab--3 {
  box-shadow: 0 0 0 3px rgba(57, 255, 136, 0.28);
}

.page-about .tl__panels {
  margin-top: clamp(22px, 3.5vw, 36px);
}

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

.page-about .tl__radio--1:checked ~ .tl__panels > .tl__panel--1,
.page-about .tl__radio--2:checked ~ .tl__panels > .tl__panel--2,
.page-about .tl__radio--3:checked ~ .tl__panels > .tl__panel--3 {
  display: grid;
  gap: 0;
  max-width: 72ch;
}

.page-about .tl__node {
  position: relative;
  display: grid;
  gap: 7px;
  padding: 2px 0 26px 22px;
  border-left: 2px solid var(--bs-line);
}

.page-about .tl__node::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bs-deep);
  border: 2px solid var(--bs-amber);
}

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

.page-about .tl__node:last-child::before {
  border-color: var(--bs-green);
  box-shadow: 0 0 0 4px var(--ab-green-soft);
}

.page-about .tl__node-year {
  font-family: var(--bs-font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--bs-amber);
}

.page-about .tl__node-title {
  color: var(--bs-ink);
}

.page-about .tl__node p {
  margin: 0;
  color: var(--bs-muted);
  max-width: 60ch;
}

/* ---------------- 团队 ---------------- */

.page-about .team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

@media (min-width: 900px) {
  .page-about .team__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: start;
  }
}

.page-about .team__roles {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .role {
  border: 1px solid var(--bs-line-soft);
  border-radius: var(--bs-radius-sm);
  padding: 14px 18px;
  background: linear-gradient(180deg, rgba(16, 35, 58, 0.92), rgba(10, 22, 38, 0.92));
  transition: border-color 0.3s var(--bs-ease), transform 0.3s var(--bs-ease);
}

.page-about .role:hover,
.page-about .role:focus-within {
  border-color: var(--bs-green);
  transform: translateX(3px);
}

.page-about .role:focus-visible {
  outline: 2px solid var(--bs-green);
  outline-offset: 2px;
}

.page-about .role__name {
  display: block;
  font-family: var(--bs-font-display);
  font-weight: 800;
  letter-spacing: 0.04em;
  font-size: 1rem;
  color: var(--bs-ink);
}

.page-about .role__hint {
  display: block;
  margin-top: 4px;
  font-family: var(--bs-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--bs-amber);
  transition: opacity 0.3s var(--bs-ease);
}

.page-about .role__desc {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--bs-muted);
  transition: max-height 0.45s var(--bs-ease), opacity 0.35s var(--bs-ease),
    margin-top 0.35s var(--bs-ease);
}

.page-about .role:hover .role__desc,
.page-about .role:focus-within .role__desc {
  max-height: 260px;
  opacity: 1;
  margin-top: 10px;
}

.page-about .role:hover .role__hint,
.page-about .role:focus-within .role__hint {
  opacity: 0;
}

/* ---------------- 数据资产 ---------------- */

.page-about .about-spec {
  margin: 0;
  border-top: 1px solid var(--bs-line-soft);
}

.page-about .about-spec__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 18px 0 18px 18px;
  border-bottom: 1px solid var(--bs-line-soft);
  border-left: 2px solid var(--bs-line);
  transition: border-left-color 0.3s var(--bs-ease), background 0.3s var(--bs-ease);
}

.page-about .about-spec__row:hover {
  border-left-color: var(--bs-amber);
  background: rgba(16, 35, 58, 0.5);
}

.page-about .about-spec dt {
  font-family: var(--bs-font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.08em;
  color: var(--bs-green);
}

.page-about .about-spec dd {
  margin: 0;
  line-height: 1.75;
  color: var(--bs-muted);
  max-width: 68ch;
}

@media (min-width: 760px) {
  .page-about .about-spec__row {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 22px;
    align-items: baseline;
  }
}

.page-about .data__notes {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
  margin-top: clamp(24px, 3.5vw, 38px);
}

.page-about .data__note {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px;
  border: 1px solid var(--bs-line);
  border-radius: var(--bs-radius-sm);
  background: rgba(10, 22, 38, 0.75);
}

.page-about .data__note-value {
  font-family: var(--bs-font-mono);
  font-size: 1.05rem;
  color: var(--bs-amber);
  letter-spacing: 0.02em;
}

.page-about .data__note-label {
  font-size: 0.84rem;
  color: var(--bs-muted);
}

/* ---------------- 归档 ---------------- */

.page-about .archive__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

@media (min-width: 900px) {
  .page-about .archive__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .archive__media {
    margin-top: clamp(22px, 4vw, 56px);
  }
}

.page-about .archive__list {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .archive__list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0;
  border-top: 1px solid var(--bs-line-soft);
}

@media (min-width: 760px) {
  .page-about .archive__list li {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

.page-about .archive__k {
  font-family: var(--bs-font-mono);
  font-size: 0.84rem;
  letter-spacing: 0.06em;
  color: var(--bs-amber);
}

.page-about .archive__v {
  color: var(--bs-muted);
  line-height: 1.75;
}

.page-about .archive__link {
  margin-top: clamp(18px, 3vw, 26px);
  color: var(--bs-muted);
}

/* ---------------- 合作 ---------------- */

.page-about .partners__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

@media (min-width: 820px) {
  .page-about .partners__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

.page-about .partners__item {
  padding: 22px 22px 24px;
  border-left: 2px solid var(--bs-green);
}

.page-about .partners__item:nth-child(2) {
  border-left-color: var(--bs-amber);
}

.page-about .partners__item:nth-child(3) {
  border-left-color: var(--bs-line);
}

.page-about .partners__num {
  display: block;
  font-family: var(--bs-font-mono);
  font-size: 1.2rem;
  color: var(--bs-green);
  margin-bottom: 10px;
  letter-spacing: 0.02em;
}

.page-about .partners__item:nth-child(2) .partners__num {
  color: var(--bs-amber);
}

.page-about .partners__item h3 {
  color: var(--bs-ink);
  margin-bottom: 10px;
}

.page-about .partners__item p {
  margin: 0;
  color: var(--bs-muted);
  font-size: 0.94rem;
}

/* ---------------- 收尾 ---------------- */

.page-about .about-next {
  padding: clamp(46px, 7vw, 92px) 0 clamp(56px, 8vw, 108px);
  border-top: 1px solid var(--bs-line-soft);
}

.page-about .about-next__panel {
  padding: clamp(26px, 4vw, 48px);
  background:
    radial-gradient(620px 300px at 92% 0%, rgba(57, 255, 136, 0.1), transparent 65%),
    linear-gradient(160deg, var(--bs-panel), var(--bs-deep));
}

.page-about .about-next__panel h2 {
  font-family: var(--bs-font-display);
  font-weight: 800;
  letter-spacing: 0.02em;
  line-height: 1.15;
  font-size: clamp(1.35rem, 4vw, 2.1rem);
  margin: 0.35em 0 0.5em;
  max-width: 22ch;
}

.page-about .about-next__panel p {
  max-width: 60ch;
  line-height: 1.8;
  color: var(--bs-muted);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-next__actions .bs-btn {
  text-decoration: none;
}

.page-about .about-next__contact {
  margin-top: 20px;
  font-family: var(--bs-font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  color: var(--bs-amber);
}

/* ---------------- 渐入与降级 ---------------- */

.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--bs-ease), transform 0.7s var(--bs-ease);
}

.page-about [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .role,
  .page-about .role__desc,
  .page-about .tl__tab,
  .page-about .about-spec__row {
    transition: none;
  }
}