/* ===== BSPORTS 品牌介绍页 专属样式 ===== */
.page-about {
  --about-ink: rgba(230, 241, 237, .84);
  --about-ink-soft: rgba(230, 241, 237, .62);
  display: block;
}

/* --- 面包屑 --- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 20px 0 6px;
  font-size: 13px;
  line-height: 1.6;
}

.page-about .breadcrumb__item {
  color: var(--sage);
  text-decoration: none;
  letter-spacing: .02em;
}

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

.page-about .breadcrumb__sep {
  color: rgba(126, 154, 144, .55);
}

/* --- 首屏：品牌身份 --- */
.page-about .about-hero {
  padding-top: 18px;
}

.page-about .about-hero__frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(165deg, var(--pitch) 0%, var(--char) 74%);
}

.page-about .about-hero__media {
  display: block;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  filter: saturate(.8) brightness(.76) contrast(1.06);
}

.page-about .about-hero__copy {
  padding: 24px 22px 30px;
}

.page-about .about-hero__title {
  margin: 12px 0 16px;
  font-size: clamp(27px, 5.4vw, 50px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--mist);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 58ch;
  color: var(--about-ink);
  font-size: 15.5px;
  line-height: 1.85;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 20px;
  border: 1px solid var(--line);
  background: var(--line-soft);
}

.page-about .about-hero__stats .stat {
  padding: 18px 20px;
  background: var(--char);
}

.page-about .about-hero__stats .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  letter-spacing: -.01em;
  color: var(--cyan);
}

.page-about .about-hero__stats .stat__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--sage);
}

@media (min-width: 700px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__copy {
    position: relative;
    z-index: 2;
    margin: -112px 44px 44px;
    padding: 34px 38px 36px;
    background: rgba(4, 28, 23, .82);
    border: 1px solid var(--cyan-line);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
  }
}

/* --- 矩阵构成 --- */
.page-about .about-matrix {
  padding-top: 78px;
}

.page-about .about-matrix__grid {
  display: grid;
  gap: 22px;
  margin-top: 28px;
}

.page-about .about-matrix__diagram {
  padding: 24px 18px 22px;
}

.page-about .about-matrix__node {
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: rgba(6, 42, 34, .72);
  padding: 12px 14px;
  transition: border-color .22s ease, background .22s ease, opacity .22s ease;
}

.page-about .about-matrix__node--root {
  max-width: 340px;
  margin: 0 auto;
  text-align: center;
  border-color: var(--cyan-line);
  background: linear-gradient(120deg, rgba(22, 224, 192, .18), rgba(22, 224, 192, .03));
}

.page-about .about-matrix__name {
  display: block;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--mist);
}

.page-about .about-matrix__desc {
  display: block;
  margin-top: 5px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--sage);
}

.page-about .about-matrix__lines {
  display: none;
  width: 100%;
  height: 52px;
  margin: 6px 0;
}

.page-about .about-matrix__lines path {
  fill: none;
  stroke: rgba(22, 224, 192, .42);
  stroke-width: 1.5;
  vector-effect: non-scaling-stroke;
}

.page-about .about-matrix__leaves {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

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

.page-about .about-matrix__text {
  margin: 0 0 14px;
  color: var(--about-ink);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .about-matrix__media {
  margin: 22px 0 0;
}

.page-about .about-matrix__media img {
  display: block;
  width: 100%;
  height: auto;
  filter: saturate(.85) brightness(.86);
}

@media (min-width: 620px) {
  .page-about .about-matrix__lines {
    display: block;
  }

  .page-about .about-matrix__leaves {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 960px) {
  .page-about .about-matrix__grid {
    grid-template-columns: 1.32fr 1fr;
    gap: 26px;
    align-items: start;
  }

  .page-about .about-matrix__diagram {
    padding: 32px 28px 28px;
  }

  .page-about .about-matrix__aside {
    margin-top: 40px;
  }
}

@media (hover: hover) and (pointer: fine) {
  .page-about .about-matrix__diagram:hover .about-matrix__node {
    opacity: .5;
  }

  .page-about .about-matrix__diagram .about-matrix__node:hover {
    opacity: 1;
    border-color: var(--cyan);
    background: rgba(22, 224, 192, .12);
  }
}

/* --- 版本演进时间轴 --- */
.page-about .about-timeline {
  padding-top: 78px;
}

.page-about .about-rail {
  display: grid;
  gap: 14px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rail__item {
  position: relative;
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 12px;
}

.page-about .about-rail__item:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 25px;
  top: 48px;
  bottom: -14px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan-line), rgba(22, 224, 192, .04));
}

.page-about .about-rail__marker {
  display: flex;
  justify-content: center;
  padding-top: 14px;
}

.page-about .about-rail__marker .mono {
  padding: 4px 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--cyan);
  border: 1px solid var(--cyan-line);
  border-radius: var(--r);
  background: rgba(22, 224, 192, .1);
  white-space: nowrap;
}

.page-about .about-rail__card {
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: rgba(11, 15, 14, .62);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: border-color .22s ease;
}

.page-about .about-rail__card[open] {
  border-color: var(--cyan-line);
  background: rgba(6, 42, 34, .55);
}

.page-about .about-rail__card summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-rail__card summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--cyan);
}

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

.page-about .about-rail__title {
  font-size: 16.5px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--mist);
}

.page-about .about-rail__tag {
  padding: 2px 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--sage);
  border: 1px solid var(--line);
  border-radius: var(--r);
}

.page-about .about-rail__body {
  padding: 0 18px 18px;
}

.page-about .about-rail__body p {
  margin: 0;
  color: var(--about-ink);
  font-size: 14.5px;
  line-height: 1.85;
}

@media (min-width: 760px) {
  .page-about .about-rail__item {
    grid-template-columns: 88px 1fr;
    gap: 20px;
  }

  .page-about .about-rail__item:not(:last-child)::after {
    left: 43px;
  }

  .page-about .about-rail__marker .mono {
    font-size: 12.5px;
    padding: 5px 8px;
  }

  .page-about .about-rail__card summary {
    padding: 20px 24px;
  }

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

  .page-about .about-rail__body {
    padding: 0 24px 22px;
  }

  .page-about .about-rail__body p {
    max-width: 68ch;
    font-size: 15px;
  }
}

/* --- 覆盖范围与更新节奏 --- */
.page-about .about-cadence {
  padding-top: 78px;
}

.page-about .about-cadence__grid {
  display: grid;
  gap: 28px;
  margin-top: 28px;
}

.page-about .about-cadence__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-cadence__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .about-cadence__val {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-ink);
}

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

.page-about .about-cadence__media img {
  display: block;
  width: 100%;
  height: auto;
  filter: saturate(.85) brightness(.86);
}

.page-about .about-cadence__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cadence__callout {
  margin-top: 22px;
}

.page-about .about-cadence__callout p {
  margin: 8px 0 10px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-ink);
}

.page-about .about-cadence__link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(245, 168, 60, .5);
}

.page-about .about-cadence__link:hover,
.page-about .about-cadence__link:focus-visible {
  color: var(--mist);
  border-color: var(--mist);
}

@media (min-width: 560px) {
  .page-about .about-cadence__row {
    grid-template-columns: 104px 1fr;
    gap: 16px;
    align-items: baseline;
  }
}

@media (min-width: 960px) {
  .page-about .about-cadence__grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    align-items: start;
  }

  .page-about .about-cadence__side {
    margin-top: 12px;
  }
}

/* --- 团队与协作 --- */
.page-about .about-team {
  padding-top: 78px;
}

.page-about .about-team__path {
  margin-top: 26px;
}

.page-about .about-team__path .path__num {
  font-family: var(--font-mono);
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-about .about-team__path .path__body h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--mist);
}

.page-about .about-team__path .path__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--about-ink);
}

.page-about .about-team__note {
  margin: 30px 0 0;
  padding: 16px 18px;
  border-left: 2px solid var(--cyan-line);
  background: rgba(22, 224, 192, .05);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--about-ink);
}

.page-about .about-team__note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* --- 继续浏览 --- */
.page-about .about-next {
  padding-top: 78px;
  padding-bottom: 48px;
}

.page-about .about-next__panel {
  padding: 28px 22px 32px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background:
    radial-gradient(120% 150% at 6% 0%, rgba(22, 224, 192, .14), transparent 58%),
    var(--char);
}

.page-about .about-next__title {
  margin: 10px 0 12px;
  font-size: clamp(22px, 3.6vw, 32px);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--mist);
}

.page-about .about-next__text {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-ink);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

@media (min-width: 760px) {
  .page-about .about-next__panel {
    padding: 44px 44px 46px;
  }
}