.page-about {
  --about-dash: rgba(168, 182, 200, 0.34);
  --about-rail: 224px;
  display: block;
  background: var(--ink-900);
  color: var(--bone);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink-950);
  border-bottom: 1px solid var(--line-mid);
}

.page-about .about-hero-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 42%;
  opacity: 0.42;
}

.page-about .about-hero-scrim {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(7, 20, 38, 0.55) 0%, rgba(7, 20, 38, 0.8) 58%, rgba(7, 20, 38, 0.97) 100%),
    radial-gradient(120% 82% at 10% 0%, rgba(27, 77, 255, 0.36), transparent 62%),
    radial-gradient(92% 72% at 90% 102%, rgba(24, 199, 217, 0.22), transparent 64%);
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  padding-block: clamp(56px, 9vw, 104px) clamp(40px, 6vw, 72px);
}

.page-about .breadcrumbs {
  margin-bottom: 22px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--rock);
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-strong);
}

.page-about .breadcrumbs a {
  color: var(--rock);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

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

.page-about .about-hero .coord {
  margin: 0 0 12px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  max-width: 22ch;
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(28px, 4.4vw, 52px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--bone);
}

.page-about .about-lede {
  max-width: 58ch;
  margin: 20px 0 0;
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.78;
  color: var(--rock);
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  max-width: 780px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-mid);
  border: 1px solid var(--line-mid);
}

.page-about .about-hero-stats > li {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 18px;
  background: rgba(14, 35, 64, 0.82);
}

.page-about .stat-key {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--rock);
}

.page-about .stat-val {
  font-family: var(--font-num);
  font-size: clamp(18px, 2.2vw, 24px);
  line-height: 1.1;
  color: var(--bone);
}

.page-about .about-hero-stats > li:first-child .stat-val {
  color: var(--cyan);
}

/* ============ 主体两栏 ============ */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  padding-block: clamp(40px, 6vw, 76px);
}

.page-about .about-flow {
  min-width: 0;
}

/* 章节索引：移动端横向滑动 */
.page-about .about-rail {
  padding-block: 12px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .rail-list {
  display: flex;
  gap: 22px;
  margin: 0;
  padding: 0;
  list-style: none;
  white-space: nowrap;
}

.page-about .rail-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 4px;
  font-size: 13px;
  color: var(--rock);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--bone);
  border-bottom-color: var(--cyan);
}

.page-about .rail-num {
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

/* ============ 章节 ============ */
.page-about .about-section {
  padding-block: clamp(30px, 4.6vw, 54px);
}

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

.page-about .sec-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 20px;
}

.page-about .sec-head .coord {
  flex: 0 0 auto;
  margin: 0;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-section h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(22px, 2.8vw, 32px);
  line-height: 1.24;
  letter-spacing: -0.015em;
  color: var(--bone);
}

.page-about .about-section p {
  max-width: 68ch;
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--rock);
}

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

.page-about .about-section p a:not(.btn) {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(24, 199, 217, 0.42);
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .about-section p a:not(.btn):hover,
.page-about .about-section p a:not(.btn):focus-visible {
  color: var(--bone);
  border-bottom-color: var(--bone);
}

/* 能力清单 */
.page-about .cap-list {
  display: grid;
  margin: 26px 0 24px;
  border-top: 1px solid var(--line);
}

.page-about .cap {
  display: grid;
  gap: 8px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .cap h3 {
  position: relative;
  margin: 0;
  padding-left: 14px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--bone);
}

.page-about .cap h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.58em;
  width: 6px;
  height: 6px;
  background: var(--blue);
  box-shadow: 0 0 9px rgba(27, 77, 255, 0.75);
}

.page-about .cap p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
}

/* 入库流程 */
.page-about .flow {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow-step {
  position: relative;
  padding: 0 0 26px 44px;
}

.page-about .flow-step::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 26px;
  bottom: 0;
  border-left: 1px dashed var(--about-dash);
}

.page-about .flow-step::after {
  content: "";
  position: absolute;
  left: 7px;
  top: 4px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 2px solid var(--clay);
  background: var(--ink-900);
}

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

.page-about .flow-step:last-child::before {
  display: none;
}

.page-about .flow-step h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 800;
  color: var(--bone);
}

.page-about .flow-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
}

/* 图表与配图 */
.page-about .figure {
  margin: 30px 0 0;
  border: 1px solid var(--line);
  background: var(--ink-800);
  overflow: hidden;
}

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

.page-about .figure-caption {
  margin: 0;
  padding: 13px 18px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--rock);
  border-top: 1px solid var(--line);
}

/* 团队分工切换 */
.page-about .team-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 30px 0 18px;
}

.page-about .team-blocks {
  display: grid;
  gap: 16px;
}

.page-about .team-block {
  position: relative;
  padding: 24px 22px;
  background: var(--ink-800);
  border: 1px solid var(--line);
}

.page-about .team-block::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-top: 18px solid var(--blue);
  border-left: 18px solid transparent;
}

.page-about .team-num {
  display: block;
  font-family: var(--font-num);
  font-size: 32px;
  line-height: 1;
  color: var(--bone);
  text-shadow: 0 0 16px rgba(24, 199, 217, 0.45);
}

.page-about .team-unit {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .team-block h3 {
  margin: 16px 0 8px;
  font-size: 16px;
  font-weight: 800;
  color: var(--bone);
}

.page-about .team-block p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
}

/* 时间轴 */
.page-about .tl {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .tl-node {
  position: relative;
  padding-left: 26px;
}

.page-about .tl-summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 0;
  list-style: none;
  cursor: pointer;
  border-bottom: 1px solid var(--line);
  transition: border-color 0.2s ease;
}

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

.page-about .tl-summary:hover,
.page-about .tl-summary:focus-visible {
  border-bottom-color: var(--line-strong);
}

.page-about .tl-summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .tl-dot {
  flex: 0 0 auto;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 2px solid var(--clay);
  background: var(--ink-900);
  transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .tl-item[open] .tl-dot {
  border-color: var(--moss);
  background: var(--moss);
  box-shadow: 0 0 10px rgba(94, 140, 106, 0.72);
}

.page-about .tl-year {
  flex: 0 0 auto;
  font-family: var(--font-num);
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--clay);
  transition: color 0.2s ease;
}

.page-about .tl-item[open] .tl-year {
  color: var(--moss);
}

.page-about .tl-name {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--bone);
}

.page-about .tl-arrow {
  flex: 0 0 auto;
  align-self: center;
  width: 8px;
  height: 8px;
  margin-left: auto;
  border-right: 2px solid var(--rock);
  border-bottom: 2px solid var(--rock);
  transform: rotate(45deg);
  transition: transform 0.26s ease, border-color 0.26s ease;
}

.page-about .tl-item[open] .tl-arrow {
  transform: rotate(-135deg);
  border-color: var(--cyan);
}

.page-about .tl-panel {
  margin-left: 5px;
  padding: 14px 0 20px 22px;
  border-left: 1px dashed var(--about-dash);
}

.page-about .tl-panel p {
  max-width: 62ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
}

/* 覆盖范围 */
.page-about .league-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 26px 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .league-cell {
  padding: 16px 8px;
  text-align: center;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--rock);
  background: var(--ink-900);
  transition: color 0.18s ease, background 0.18s ease, box-shadow 0.18s ease;
}

.page-about .league-cell:hover {
  color: var(--bone);
  background: rgba(27, 77, 255, 0.24);
  box-shadow: inset 0 0 0 1px var(--cyan);
}

/* 联系方式 */
.page-about .contact-grid {
  display: grid;
  gap: 1px;
  margin: 26px 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .contact-item {
  padding: 20px;
  background: var(--ink-800);
}

.page-about .contact-item dt {
  margin-bottom: 8px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--rock);
}

.page-about .contact-item dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--bone);
  word-break: break-word;
}

.page-about .contact-item dd.mono {
  font-family: var(--font-num);
  letter-spacing: 0.02em;
}

.page-about .contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px !important;
}

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-about .about-hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .league-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .cap {
    grid-template-columns: 152px minmax(0, 1fr);
    gap: 8px 24px;
  }

  .page-about .team-blocks {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 72px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    padding-block: 0;
    border: 0;
    overflow: visible;
  }

  .page-about .rail-list {
    display: block;
    border-left: 1px dashed var(--about-dash);
    white-space: normal;
  }

  .page-about .rail-item {
    position: relative;
  }

  .page-about .rail-item::before {
    content: "";
    position: absolute;
    left: -5px;
    top: 19px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    border: 1px solid var(--line-strong);
    background: var(--ink-900);
    transition: border-color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
  }

  .page-about .rail-item:hover::before {
    border-color: var(--cyan);
    background: var(--cyan);
    box-shadow: 0 0 10px rgba(24, 199, 217, 0.65);
  }

  .page-about .rail-link {
    display: block;
    padding: 12px 0 12px 20px;
    font-size: 14px;
    line-height: 1.45;
    border-bottom: 0;
  }

  .page-about .league-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (min-width: 1280px) {
  .page-about .about-body {
    gap: 88px;
  }
}
<<<END>>>