.page-about {
  --about-rail: 176px;
  --about-glow: 0 24px 60px -36px rgba(47, 230, 210, .55);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 4.5vw, 58px) 0 clamp(34px, 5vw, 68px);
  border-bottom: 1px solid var(--hairline);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -28%;
  right: -12%;
  width: min(560px, 82vw);
  height: min(560px, 82vw);
  background: radial-gradient(circle at 50% 50%, var(--violet-a), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-hero__copy .lede {
  margin-top: 18px;
  color: var(--silver-200);
  max-width: 56ch;
}

.page-about .about-hero__visual {
  margin: 0;
  border-radius: var(--radius);
  border: 1px solid var(--hairline);
  box-shadow: var(--about-glow);
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-facts li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 15px 16px;
  background: var(--ink-800);
}

.page-about .about-facts__num {
  font-family: var(--font-mono);
  font-size: 21px;
  line-height: 1.1;
  color: var(--silver-050);
  letter-spacing: -.01em;
}

.page-about .about-facts__label {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--silver-400);
}

/* 时间线 */
.page-about .about-timeline {
  padding: clamp(36px, 5vw, 68px) 0;
  border-bottom: 1px solid var(--hairline);
}

.page-about .about-timeline .section-head {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(5, minmax(150px, 1fr));
  border-top: 1px solid var(--hairline-soft);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .timeline__node {
  position: relative;
  padding: 28px clamp(14px, 2vw, 26px) 10px 0;
}

.page-about .timeline__node::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(47, 230, 210, .12);
}

.page-about .timeline__node--violet::before {
  border-color: var(--violet);
  box-shadow: 0 0 0 4px rgba(139, 92, 246, .16);
}

.page-about .timeline__node a {
  display: flex;
  flex-direction: column;
  gap: 7px;
  text-decoration: none;
  color: inherit;
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: 19px;
  letter-spacing: .05em;
  color: var(--silver-050);
  transition: color .24s ease;
}

.page-about .timeline__label {
  font-size: 13px;
  line-height: 1.65;
  color: var(--silver-400);
}

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

.page-about .timeline__node a:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 6px;
}

/* 正文布局 */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  padding: clamp(34px, 5vw, 72px) 0 clamp(48px, 6vw, 88px);
}

.page-about .about-rail {
  align-self: start;
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--silver-400);
}

.page-about .about-index {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 13px;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  font-size: 13px;
  line-height: 1.4;
  white-space: nowrap;
  text-decoration: none;
  color: var(--silver-200);
  transition: border-color .24s ease, color .24s ease, background-color .24s ease;
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  border-color: var(--cyan);
  color: var(--silver-050);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--cyan);
}

/* 章节 */
.page-about .about-chapter {
  scroll-margin-top: 112px;
  padding: clamp(26px, 3.6vw, 44px) 0;
  border-top: 1px solid var(--hairline);
}

.page-about .about-chapter:first-child {
  padding-top: 0;
  border-top: 0;
}

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

.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 10px 16px;
  margin-bottom: clamp(16px, 2vw, 24px);
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: rgba(139, 147, 162, .34);
  -webkit-text-stroke: 1px rgba(139, 147, 162, .42);
}

.page-about .about-chapter__title {
  margin: 0;
  font-size: clamp(19px, 2.4vw, 27px);
  font-weight: 800;
  line-height: 1.34;
  letter-spacing: -.02em;
  color: var(--silver-050);
}

.page-about .about-chapter p {
  margin: 0 0 15px;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--silver-200);
}

.page-about .about-chapter p:last-child {
  margin-bottom: 0;
}

.page-about .about-chapter p strong {
  color: var(--silver-050);
  font-weight: 600;
}

.page-about .about-num {
  font-family: var(--font-mono);
  color: var(--silver-050);
  letter-spacing: .02em;
}

/* 年度数据小卡列 */
.page-about .about-assets {
  list-style: none;
  margin: clamp(20px, 2.6vw, 28px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-assets li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px;
  background: var(--ink-700);
}

.page-about .about-assets__num {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: -.01em;
}

.page-about .about-assets__label {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--silver-400);
}

/* 配图 */
.page-about .about-figure {
  margin: clamp(22px, 3vw, 32px) 0 0;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
}

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

/* 团队卡片 */
.page-about .team-grid {
  margin: clamp(18px, 2.4vw, 26px) 0 clamp(20px, 2.6vw, 28px);
}

.page-about .team-grid .card-title {
  margin: 12px 0 8px;
  font-size: 16px;
  letter-spacing: -.01em;
}

.page-about .team-grid .card-text {
  font-size: 14px;
  line-height: 1.75;
  color: var(--silver-400);
}

/* 版本表 */
.page-about .table-wrap {
  margin: clamp(20px, 2.6vw, 28px) 0 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
}

.page-about .data-table {
  min-width: 520px;
}

/* 服务入口 */
.page-about .about-scope {
  list-style: none;
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .about-scope a {
  display: grid;
  gap: 7px;
  padding: 18px 20px;
  border: 1px solid var(--hairline);
  border-left: 2px solid var(--hairline-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--ink-800);
  text-decoration: none;
  transition: border-color .24s ease, background-color .24s ease, transform .24s ease;
}

.page-about .about-scope a:hover,
.page-about .about-scope a:focus-visible {
  border-left-color: var(--cyan);
  background: linear-gradient(90deg, var(--cyan-a), transparent 62%), var(--ink-800);
  transform: translateX(2px);
}

.page-about .about-scope__title {
  font-size: 15.5px;
  font-weight: 600;
  color: var(--silver-050);
}

.page-about .about-scope__text {
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--silver-400);
}

/* 联系方式 */
.page-about .about-contact {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 20px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--violet-a), transparent 58%), var(--ink-800);
}

.page-about .about-contact__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  padding: 10px 0;
  border-bottom: 1px solid var(--hairline);
}

.page-about .about-contact__row:first-child {
  padding-top: 0;
}

.page-about .about-contact__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--silver-400);
}

.page-about .about-contact__value {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--silver-050);
  overflow-wrap: anywhere;
}

.page-about .about-contact__row .copy-btn {
  margin-left: auto;
  padding: 6px 14px;
  font-size: 12.5px;
  border: 1px solid var(--hairline-soft);
  border-radius: 999px;
  background: transparent;
  color: var(--silver-200);
  cursor: pointer;
  transition: border-color .24s ease, color .24s ease, background-color .24s ease;
}

.page-about .about-contact__row .copy-btn:hover,
.page-about .about-contact__row .copy-btn:focus-visible {
  border-color: var(--cyan);
  color: var(--silver-050);
  background: var(--cyan-a);
}

.page-about .about-contact__row .copy-btn[data-copied] {
  border-color: var(--amber);
  color: var(--amber);
}

.page-about .about-contact__note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--silver-400);
}

/* 断点 */
@media (min-width: 560px) {
  .page-about .about-assets {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-scope {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: end;
  }

  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(34px, 5vw, 76px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 108px;
  }

  .page-about .about-index {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }

  .page-about .about-index a {
    width: 100%;
    border: 0;
    border-left: 2px solid var(--hairline);
    border-radius: 0;
    padding: 9px 0 9px 14px;
    white-space: normal;
    line-height: 1.5;
    color: var(--silver-400);
  }

  .page-about .about-index a:hover,
  .page-about .about-index a:focus-visible {
    border-left-color: var(--cyan);
    background: linear-gradient(90deg, var(--cyan-a), transparent);
    color: var(--silver-050);
  }

  .page-about .about-chapter__head {
    gap: 12px 22px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero__copy {
    padding-bottom: 8px;
  }

  .page-about .about-chapter p {
    font-size: 16.5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__year,
  .page-about .about-scope a,
  .page-about .about-index a {
    transition: none;
  }

  .page-about .about-scope a:hover,
  .page-about .about-scope a:focus-visible {
    transform: none;
  }
}