.page-about {
  --ab-track: rgba(255, 255, 255, 0.08);
  --ab-red-soft: rgba(255, 46, 77, 0.1);
}

.page-about .ab-layout {
  display: block;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 20px 96px;
}

.page-about .ab-content {
  min-width: 0;
}

.page-about .breadcrumb {
  padding-top: 20px;
}

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

/* ===== 侧边章节索引 ===== */
.page-about .ab-rail {
  position: sticky;
  top: 72px;
  z-index: 30;
  display: flex;
  align-items: center;
  margin: 0 -20px 32px;
  padding: 12px 20px;
  background: rgba(11, 14, 20, 0.88);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

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

.page-about .ab-rail__inner {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-shrink: 0;
}

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

.page-about .ab-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  font-size: 12px;
  color: var(--gray);
  border: 1px solid var(--border);
  border-radius: 999px;
  white-space: nowrap;
  text-decoration: none;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  color: var(--white);
  border-color: var(--red);
  background: var(--ab-red-soft);
}

.page-about .ab-rail__num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--red);
}

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

/* ===== 品牌简介 ===== */
.page-about .ab-section {
  padding-top: 64px;
}

.page-about .ab-section + .ab-section {
  margin-top: 8px;
}

.page-about .ab-brand__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-bottom: 32px;
}

.page-about .ab-kicker {
  display: inline-flex;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--white);
  background: var(--red);
  padding: 5px 12px 5px 10px;
  -webkit-clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  margin-bottom: 14px;
}

.page-about .ab-brand__intro h1 {
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 900;
  line-height: 1.08;
  margin: 0 0 16px;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .ab-brand__lead {
  font-size: 1.1rem;
  line-height: 1.6;
  color: var(--white);
  margin-bottom: 16px;
}

.page-about .ab-brand__intro > p:last-child {
  color: var(--gray);
  line-height: 1.7;
}

.page-about .frame-view {
  position: relative;
  background: var(--glass-2);
  border: 1px solid var(--border);
  overflow: hidden;
}

.page-about .frame-view::before {
  content: attr(data-label);
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 2;
  padding: 4px 8px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--white);
  background: var(--red);
}

.page-about .frame-view__inner {
  position: relative;
}

.page-about .ab-stage__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}

.page-about .ab-brand__cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .ab-brand__cards .glass-card {
  padding: 24px;
  border: 1px solid var(--border);
  background: var(--glass-2);
  position: relative;
  transition: border-color 0.25s, background 0.25s;
}

.page-about .ab-brand__cards .glass-card:hover {
  border-color: rgba(255, 46, 77, 0.5);
  background: rgba(255, 255, 255, 0.03);
}

.page-about .ab-brand__cards .glass-card::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--red);
  transition: width 0.3s;
}

.page-about .ab-brand__cards .glass-card:hover::after {
  width: 100%;
}

.page-about .ab-brand__cards .glass-card h3 {
  font-size: 1.05rem;
  font-weight: 800;
  margin: 12px 0 8px;
  line-height: 1.3;
  color: var(--white);
}

.page-about .ab-brand__cards .glass-card p {
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--gray);
  margin-bottom: 16px;
}

/* ===== 发展里程碑 ===== */
.page-about .ab-section--milestone {
  position: relative;
}

.page-about .ab-section--milestone::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, var(--red), transparent 60%);
}

.page-about .ab-section--milestone .section-head h2,
.page-about .ab-section--data .section-head h2,
.page-about .ab-section--team .section-head h2 {
  font-size: 1.75rem;
  font-weight: 900;
  color: var(--white);
}

.page-about .ab-timeline {
  list-style: none;
  margin: 32px 0 32px;
  padding: 0;
}

.page-about .ab-timeline__item {
  display: flex;
  gap: 20px;
  margin-bottom: 20px;
}

.page-about .ab-timeline__marker {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 20px;
  flex-shrink: 0;
  position: relative;
}

.page-about .ab-timeline__dot {
  width: 12px;
  height: 12px;
  margin-top: 10px;
  border-radius: 50%;
  background: var(--red);
  box-shadow: 0 0 0 4px rgba(255, 46, 77, 0.2), 0 0 12px rgba(255, 46, 77, 0.6);
}

.page-about .ab-timeline__dot--now {
  background: var(--yellow);
  box-shadow: 0 0 0 4px rgba(230, 255, 61, 0.2), 0 0 12px rgba(230, 255, 61, 0.5);
}

.page-about .ab-timeline__item:not(:last-child) .ab-timeline__marker::after {
  content: '';
  width: 2px;
  flex: 1;
  margin-top: 4px;
  background: linear-gradient(180deg, rgba(255, 46, 77, 0.6), rgba(255, 255, 255, 0.08));
}

.page-about .ab-timeline__body {
  flex: 1;
  padding: 0 0 8px;
}

.page-about .ab-timeline__tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--red);
  background: var(--ab-red-soft);
  padding: 4px 10px 4px 8px;
  margin-bottom: 10px;
  -webkit-clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.page-about .ab-timeline__body h3 {
  font-size: 1.25rem;
  font-weight: 800;
  margin: 0 0 4px;
  color: var(--white);
}

.page-about .ab-timeline__brief {
  font-size: 0.9rem;
  color: var(--gray);
  line-height: 1.6;
  margin: 0 0 8px;
}

.page-about .ab-timeline__detail {
  border-top: 1px dashed var(--border);
  padding-top: 10px;
  margin-top: 12px;
}

.page-about .ab-timeline__detail summary {
  cursor: pointer;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--yellow);
  font-weight: 600;
}

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

.page-about .ab-timeline__detail summary::before {
  content: '+';
  font-family: var(--mono);
  color: var(--yellow);
  transition: transform 0.2s;
}

.page-about .ab-timeline__detail[open] summary::before {
  content: '\2212';
}

.page-about .ab-timeline__detail ul {
  margin: 12px 0 0;
  padding-left: 18px;
  font-size: 0.88rem;
  color: var(--gray);
  line-height: 1.7;
}

.page-about .ab-section--milestone > .btn {
  margin-top: 4px;
}

/* ===== 技术与数据能力 ===== */
.page-about .ab-section--data {
  padding: 56px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: linear-gradient(100deg, rgba(29, 43, 77, 0.35), rgba(11, 14, 20, 0) 60%);
}

.page-about .ab-data__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-bottom: 32px;
}

.page-about .ab-data__text p {
  color: var(--gray);
  line-height: 1.7;
  margin-bottom: 16px;
}

.page-about .ab-data__text p:first-child {
  color: var(--white);
}

.page-about .ab-data__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
}

.page-about .ab-data__stats li {
  flex: 1;
  min-width: 100px;
  padding: 16px;
  background: var(--glass-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  text-align: center;
}

.page-about .ab-data__stats strong {
  display: block;
  font-family: var(--mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--yellow);
}

.page-about .ab-data__stats span {
  display: block;
  font-size: 12px;
  color: var(--gray);
  margin-top: 4px;
}

.page-about .ab-data__img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--border);
}

/* ===== 数据完整度条形图 ===== */
.page-about .ab-chart {
  padding: 24px;
  background: linear-gradient(135deg, rgba(29, 43, 77, 0.6), rgba(11, 14, 20, 0.6));
  border: 1px solid var(--border);
  border-left: 3px solid var(--red);
}

.page-about .ab-chart h3 {
  font-size: 1rem;
  font-weight: 800;
  margin: 0 0 4px;
  color: var(--white);
}

.page-about .ab-chart__note {
  font-size: 0.8rem;
  color: var(--gray);
  margin: 0 0 20px;
}

.page-about .ab-chart__row {
  display: grid;
  grid-template-columns: 48px 1fr 48px;
  gap: 12px;
  align-items: center;
  margin-bottom: 14px;
}

.page-about .ab-chart__row:last-child {
  margin-bottom: 0;
}

.page-about .ab-chart__name {
  font-size: 13px;
  color: var(--white);
}

.page-about .ab-chart__track {
  height: 18px;
  background: var(--ab-track);
  border-radius: 2px;
  overflow: hidden;
  position: relative;
}

.page-about .ab-chart__fill {
  display: block;
  height: 100%;
  border-radius: 2px;
  position: relative;
  transition: filter 0.25s, transform 0.25s;
}

.page-about .ab-chart__fill:hover {
  filter: brightness(1.25);
  transform: scaleY(1.15);
}

.page-about .ab-chart__fill--football {
  width: 96%;
  background: linear-gradient(90deg, var(--red), #ff6b7a);
}

.page-about .ab-chart__fill--basketball {
  width: 88%;
  background: linear-gradient(90deg, var(--yellow), #f4ff8e);
}

.page-about .ab-chart__fill--other {
  width: 67%;
  background: linear-gradient(90deg, var(--green), #7affc8);
}

.page-about .ab-chart__value {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--white);
  text-align: right;
}

/* ===== 资质与团队 ===== */
.page-about .ab-section--team {
  padding-bottom: 8px;
}

.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .ab-team__img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--border);
}

.page-about .ab-team__content > p:first-child {
  color: var(--gray);
  line-height: 1.7;
}

.page-about .ab-team__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 20px 0;
}

.page-about .ab-team__stats div {
  padding: 16px 8px;
  text-align: center;
  background: var(--glass-2);
  border: 1px solid var(--border);
}

.page-about .ab-team__stats strong {
  display: block;
  font-family: var(--mono);
  font-size: 1.4rem;
  color: var(--red);
}

.page-about .ab-team__stats span {
  display: block;
  font-size: 11px;
  color: var(--gray);
  margin-top: 4px;
}

.page-about .ab-team__icp {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--white);
  background: rgba(255, 255, 255, 0.04);
  border: 1px dashed var(--border);
  display: inline-block;
  padding: 8px 12px;
  margin-bottom: 20px;
}

.page-about .ab-team__content .btn {
  margin-top: 4px;
}

/* ===== 响应式：平板 ===== */
@media (min-width: 768px) {
  .page-about .ab-brand__grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: center;
  }

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

  .page-about .ab-data__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: center;
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: center;
  }
}

/* ===== 响应式：桌面 ===== */
@media (min-width: 992px) {
  .page-about .ab-layout {
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .ab-rail {
    position: sticky;
    top: 96px;
    display: block;
    margin: 0;
    padding: 0;
    background: none;
    border: none;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
    overflow: visible;
    align-self: start;
    height: fit-content;
  }

  .page-about .ab-rail__inner {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .page-about .ab-rail__label {
    display: block;
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--gray);
    padding: 0 0 12px 16px;
  }

  .page-about .ab-rail__link {
    display: flex;
    justify-content: flex-start;
    padding: 10px 16px;
    font-size: 14px;
    border: none;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: none;
  }

  .page-about .ab-rail__link:hover,
  .page-about .ab-rail__link:focus-visible {
    border-left-color: var(--red);
    background: linear-gradient(90deg, rgba(255, 46, 77, 0.08), transparent);
  }

  .page-about .ab-rail__meta {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 40px;
    padding-left: 16px;
    font-family: var(--mono);
    font-size: 11px;
    color: var(--gray);
  }

  .page-about .ab-meta-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--green);
    box-shadow: 0 0 8px var(--green);
  }

  .page-about .ab-section {
    padding-top: 80px;
  }

  .page-about .ab-section + .ab-section {
    margin-top: 16px;
  }

  .page-about .ab-timeline__item {
    gap: 28px;
  }

  .page-about .ab-timeline__body {
    padding-right: 24px;
  }
}