.page-about {
  --about-timing: 0.3s ease;
  --about-card-pad: 24px;
  background: var(--bg-main);
}

.page-about .content-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding-top: 24px;
  padding-bottom: 64px;
}

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

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.page-about .breadcrumb a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .breadcrumb a:hover {
  color: var(--accent-lime);
}

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

.page-about .breadcrumb__current {
  color: var(--text-main);
}

/* 页头 */
.page-about .page-header {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line-dim);
}

.page-about .page-header__kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-lime);
}

.page-about .page-header__kicker::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--accent-lime);
}

.page-about .page-title {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 700;
  font-size: clamp(40px, 6vw, 84px);
  line-height: 0.96;
  letter-spacing: -0.01em;
  color: var(--text-main);
  margin: 0 0 16px;
  max-width: 12em;
}

.page-about .page-intro {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0;
}

/* 通用章节 */
.page-about .about-section {
  padding: 52px 0;
  scroll-margin-top: calc(var(--header-h) + var(--header-offset) + 16px);
}

.page-about .about-section + .about-section {
  border-top: 1px solid var(--line-dim);
}

.page-about .section-heading {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 28px;
}

.page-about .section-title {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 700;
  font-size: clamp(26px, 3.5vw, 44px);
  line-height: 1.08;
  color: var(--text-main);
  margin: 0;
  max-width: 16em;
}

.page-about .section-tag {
  color: var(--accent-lime);
}

.page-about .section-tag[data-tone="blue"] {
  color: var(--accent-blue);
}

.page-about .section-tag[data-tone="orange"] {
  color: var(--accent-orange);
}

/* 品牌声明 */
.page-about .declaration-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.page-about .declaration-copy {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .declaration-copy p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-secondary);
}

.page-about .declaration-copy a {
  color: var(--accent-blue);
  text-decoration: none;
  border-bottom: 1px dashed rgba(36, 230, 255, 0.4);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .declaration-copy a:hover {
  color: var(--accent-lime);
  border-bottom-color: var(--accent-lime);
}

.page-about .declaration-lead {
  font-size: 18px;
  line-height: 1.65;
  color: var(--text-main);
  font-weight: 500;
  border-left: 3px solid var(--accent-lime);
  padding-left: 16px;
}

.page-about .margin-note {
  background: var(--bg-surface);
  border: 1px solid var(--line-dim);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  padding: 16px 20px 16px 16px;
  margin: 8px 0 0;
  max-width: 440px;
}

.page-about .margin-note__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-lime);
  margin-bottom: 8px;
}

.page-about .margin-note p {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

.page-about .declaration-figure {
  margin: 0;
}

.page-about .declaration-figure__frame {
  position: relative;
}

.page-about .declaration-figure__frame::after {
  content: "";
  position: absolute;
  inset: auto 0 0 auto;
  width: 40px;
  height: 40px;
  background: var(--accent-lime);
  clip-path: polygon(100% 0, 0 100%, 100% 100%);
}

.page-about .declaration-figure__cap {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

.page-about .img-frame {
  overflow: hidden;
}

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

/* 运营数据 */
.page-about .stats-section {
  position: relative;
  background: var(--grad-metal);
  border-top: 1px solid var(--line-dim);
}

.page-about .stats-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-bottom: 36px;
}

.page-about .stat-card {
  position: relative;
  padding: var(--about-card-pad) 20px;
  background: rgba(11, 14, 19, 0.55);
  min-height: 190px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform var(--about-timing), box-shadow var(--about-timing), border-color var(--about-timing);
}

.page-about .stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-panel);
}

.page-about .stat-card__index {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent-lime);
  letter-spacing: 0.1em;
}

.page-about .stat-card__num {
  font-family: var(--font-mono);
  font-size: clamp(40px, 5vw, 58px);
  font-weight: 600;
  line-height: 1;
  color: var(--text-main);
  margin-top: 16px;
  display: block;
}

.page-about .stat-card__suffix {
  font-size: 15px;
  margin-left: 4px;
  color: var(--text-dim);
  font-weight: 400;
}

.page-about .stat-card__label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-top: 12px;
  display: block;
}

.page-about .stat-card__desc {
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-dim);
  margin: 8px 0 0;
}

.page-about .stat-card__desc a {
  color: var(--accent-blue);
  text-decoration: none;
  border-bottom: 1px dashed rgba(36, 230, 255, 0.35);
}

.page-about .stat-card__desc a:hover {
  color: var(--accent-lime);
}

.page-about .stats-visual {
  position: relative;
  margin-top: 8px;
  border: 1px solid var(--line-dim);
  padding: 14px;
  background: rgba(11, 14, 19, 0.7);
}

.page-about .stats-visual__img {
  width: 100%;
  height: auto;
  display: block;
}

.page-about .stats-visual__caption {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  margin: 12px 0 0;
  letter-spacing: 0.04em;
  text-align: right;
}

/* 发展历程 */
.page-about .timeline-section {
  background-image: linear-gradient(var(--line-dim) 1px, transparent 1px), linear-gradient(90deg, var(--line-dim) 1px, transparent 1px);
  background-size: 32px 32px;
}

.page-about .brand-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .brand-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(to bottom, var(--accent-lime) 0%, var(--accent-blue) 30%, var(--accent-orange) 65%, var(--line-color) 100%);
  opacity: 0.55;
}

.page-about .brand-timeline__item {
  position: relative;
  padding-left: 40px;
  padding-bottom: 38px;
}

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

.page-about .brand-timeline__marker {
  position: absolute;
  left: 0;
  top: 4px;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .brand-timeline__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent-lime);
  box-shadow: 0 0 12px rgba(214, 255, 63, 0.55);
  transition: transform var(--about-timing), box-shadow var(--about-timing);
}

.page-about .brand-timeline__item:hover .brand-timeline__dot {
  transform: scale(1.35);
  box-shadow: 0 0 20px rgba(214, 255, 63, 0.85);
}

.page-about .brand-timeline__dot--blue {
  background: var(--accent-blue);
  box-shadow: 0 0 12px rgba(36, 230, 255, 0.55);
}

.page-about .brand-timeline__item:hover .brand-timeline__dot--blue {
  box-shadow: 0 0 20px rgba(36, 230, 255, 0.85);
}

.page-about .brand-timeline__dot--orange {
  background: var(--accent-orange);
  box-shadow: 0 0 12px rgba(255, 106, 43, 0.55);
}

.page-about .brand-timeline__item:hover .brand-timeline__dot--orange {
  box-shadow: 0 0 20px rgba(255, 106, 43, 0.85);
}

.page-about .brand-timeline__dot--lime {
  background: var(--accent-lime);
  box-shadow: 0 0 12px rgba(214, 255, 63, 0.7);
}

.page-about .brand-timeline__item:hover .brand-timeline__dot--lime {
  box-shadow: 0 0 24px rgba(214, 255, 63, 0.9);
}

.page-about .brand-timeline__dot--star {
  background: var(--accent-lime);
  border-radius: 2px;
  transform: rotate(45deg);
  box-shadow: 0 0 18px rgba(214, 255, 63, 0.8);
}

.page-about .brand-timeline__item:hover .brand-timeline__dot--star {
  transform: rotate(45deg) scale(1.3);
  box-shadow: 0 0 28px rgba(214, 255, 63, 1);
}

.page-about .brand-timeline__body {
  background: var(--bg-surface);
  border: 1px solid var(--line-dim);
  padding: 20px 22px;
  position: relative;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  transition: border-color var(--about-timing), background var(--about-timing);
}

.page-about .brand-timeline__body:hover {
  border-color: var(--line-color);
  background: rgba(28, 34, 43, 0.85);
}

.page-about .brand-timeline__era {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--accent-blue);
  text-transform: uppercase;
  display: block;
  margin-bottom: 8px;
}

.page-about .brand-timeline__heading {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 22px;
  line-height: 1.2;
  color: var(--text-main);
  margin: 0 0 8px;
}

.page-about .brand-timeline__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-secondary);
}

.page-about .brand-timeline__body a {
  color: var(--accent-blue);
  text-decoration: none;
  border-bottom: 1px dashed rgba(36, 230, 255, 0.35);
}

.page-about .brand-timeline__body a:hover {
  color: var(--accent-lime);
}

/* 团队 */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}

.page-about .team-copy {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .team-copy p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-secondary);
}

.page-about .team-copy a {
  color: var(--accent-blue);
  text-decoration: none;
  border-bottom: 1px dashed rgba(36, 230, 255, 0.35);
}

.page-about .team-copy a:hover {
  color: var(--accent-lime);
}

.page-about .team-figure {
  border: 1px solid var(--line-dim);
  padding: 10px;
  background: var(--bg-surface);
}

.page-about .team-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .team-role {
  background: var(--bg-surface);
  border: 1px solid var(--line-dim);
  padding: 18px;
  position: relative;
  transition: border-color var(--about-timing), transform var(--about-timing), background var(--about-timing);
}

.page-about .team-role:hover {
  border-color: var(--accent-blue);
  transform: translateX(4px);
  background: rgba(36, 230, 255, 0.04);
}

.page-about .team-role__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent-blue);
  display: block;
  margin-bottom: 8px;
}

.page-about .team-role__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  color: var(--text-main);
  display: block;
  margin-bottom: 8px;
}

.page-about .team-role p {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--text-dim);
}

/* 合作生态 */
.page-about .ecosystem-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-bottom: 28px;
}

.page-about .ecosystem-card {
  padding: 24px;
  background: var(--bg-surface);
  position: relative;
  transition: transform var(--about-timing), box-shadow var(--about-timing), border-color var(--about-timing);
}

.page-about .ecosystem-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-panel);
}

.page-about .ecosystem-card__idx {
  font-family: var(--font-mono);
  font-size: 22px;
  color: var(--accent-orange);
  display: block;
  margin-bottom: 16px;
}

.page-about .ecosystem-card__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  color: var(--text-main);
  margin: 0 0 12px;
}

.page-about .ecosystem-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-secondary);
}

.page-about .ecosystem-card a {
  color: var(--accent-blue);
  text-decoration: none;
  border-bottom: 1px dashed rgba(36, 230, 255, 0.35);
}

.page-about .ecosystem-card a:hover {
  color: var(--accent-lime);
}

.page-about .ecosystem-note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-dim);
  border-left: 2px solid var(--line-color);
  padding-left: 16px;
  max-width: 560px;
  margin: 0;
}

/* 联系 */
.page-about .contact-panel {
  padding: 24px;
  background: var(--bg-section);
  margin-bottom: 20px;
  max-width: 640px;
}

.page-about .contact-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-dim);
}

.page-about .contact-row:last-child {
  border-bottom: none;
}

.page-about .contact-row__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-orange);
}

.page-about .contact-row__value {
  font-size: 16px;
  color: var(--text-main);
  text-decoration: none;
  word-break: break-all;
}

.page-about a.contact-row__value:hover {
  color: var(--accent-lime);
}

.page-about .contact-note {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
  max-width: 640px;
}

.page-about .contact-note a {
  color: var(--accent-blue);
  text-decoration: none;
  border-bottom: 1px dashed rgba(36, 230, 255, 0.35);
}

.page-about .contact-note a:hover {
  color: var(--accent-lime);
  border-bottom-color: var(--accent-lime);
}

/* 移动端 rail-index 横向滚动 */
.page-about .rail-index {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 8px 0 12px;
  margin: 0 -16px;
  padding-left: 16px;
  padding-right: 16px;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-about .rail-index__title {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--text-dim);
  text-transform: uppercase;
  padding-top: 8px;
  margin-right: 4px;
}

.page-about .rail-index__item {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border: 1px solid var(--line-dim);
  background: var(--bg-surface);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-secondary);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.page-about .rail-index__item:hover {
  border-color: var(--accent-lime);
  color: var(--accent-lime);
}

.page-about .rail-index__item[aria-current="true"] {
  border-color: var(--accent-lime);
  color: var(--accent-lime);
  background: rgba(214, 255, 63, 0.08);
}

.page-about .rail-index__num {
  color: var(--accent-lime);
  font-size: 10px;
}

/* 平板及以上 */
@media (min-width: 768px) {
  .page-about .content-layout {
    grid-template-columns: 234px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .rail-index {
    flex-direction: column;
    align-items: stretch;
    overflow: visible;
    margin: 0;
    padding: 0;
    position: sticky;
    top: calc(var(--header-h) + var(--header-offset) + 16px);
    gap: 4px;
  }

  .page-about .rail-index__title {
    padding: 8px 0 12px;
    margin-right: 0;
  }

  .page-about .rail-index__item {
    white-space: normal;
    padding: 8px 0;
    border: none;
    border-bottom: 1px solid var(--line-dim);
    background: none;
    color: var(--text-dim);
    border-radius: 0;
    font-size: 12px;
  }

  .page-about .rail-index__item:hover {
    background: none;
    color: var(--accent-lime);
    border-bottom-color: var(--accent-lime);
  }

  .page-about .rail-index__item[aria-current="true"] {
    background: none;
    border-bottom-color: var(--accent-lime);
    color: var(--accent-lime);
  }

  .page-about .declaration-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 40px;
  }

  .page-about .stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .team-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .ecosystem-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .contact-row {
    flex-direction: row;
    align-items: baseline;
    justify-content: space-between;
    gap: 24px;
  }

  .page-about .contact-row__label {
    flex-shrink: 0;
  }
}

/* 桌面 */
@media (min-width: 1024px) {
  .page-about .page-header {
    padding-top: 36px;
    margin-bottom: 16px;
  }

  .page-about .about-section {
    padding: 72px 0;
  }

  .page-about .brand-timeline__body {
    padding: 24px 28px;
  }

  .page-about .team-roles {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .stat-card {
    padding: 28px 24px;
  }

  .page-about .stats-visual {
    padding: 20px;
  }
}