.page-about {
  --about-gap: clamp(28px, 4vw, 56px);
  --about-line: rgba(53, 230, 224, .38);
  color: var(--text);
  font-family: var(--font-body);
}

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

/* ---------- 首屏 ---------- */

.page-about .about-intro {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  border-bottom: 1px solid var(--line-soft);
  padding: clamp(28px, 5vw, 64px) 0 clamp(34px, 5vw, 72px);
}

.page-about .about-intro__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-intro__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .3;
}

.page-about .about-intro__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(90deg, rgba(27, 58, 84, .45) 0 1px, transparent 1px 68px),
    repeating-linear-gradient(0deg, rgba(27, 58, 84, .4) 0 1px, transparent 1px 68px),
    radial-gradient(880px 420px at 6% 0%, rgba(53, 230, 224, .16), transparent 62%),
    radial-gradient(680px 380px at 94% 100%, rgba(140, 108, 255, .18), transparent 60%),
    linear-gradient(180deg, rgba(8, 19, 31, .66) 0%, rgba(8, 19, 31, .93) 64%, var(--ink-900) 100%);
}

.page-about .about-intro__inner {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--pad);
}

.page-about .about-intro .breadcrumb {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-intro .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
}

.page-about .about-intro .breadcrumb a:hover {
  color: var(--cyan);
}

.page-about .about-intro__eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cyan);
  text-transform: uppercase;
  margin: 0;
}

.page-about .about-intro__title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 60px);
  line-height: 1.1;
  letter-spacing: -.02em;
  margin: 14px 0 0;
  max-width: 17em;
}

.page-about .about-intro__lead {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 64ch;
  color: var(--muted);
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.85;
}

.page-about .about-intro__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line-soft);
  background: var(--line-soft);
  max-width: 780px;
}

@media (min-width: 720px) {
  .page-about .about-intro__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-intro__stat {
  background: rgba(15, 34, 51, .78);
  padding: 16px 18px 18px;
}

.page-about .about-intro__stat b {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--cyan);
}

.page-about .about-intro__stat span {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 布局 ---------- */

.page-about .about-layout {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--pad) clamp(56px, 8vw, 100px);
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: 232px minmax(0, 1fr);
    gap: clamp(36px, 4vw, 76px);
    align-items: start;
  }
}

/* ---------- 侧栏 ---------- */

.page-about .about-side {
  padding-top: clamp(30px, 4vw, 48px);
}

@media (min-width: 1024px) {
  .page-about .about-side {
    position: sticky;
    top: 108px;
    padding-top: clamp(48px, 6vw, 88px);
  }
}

.page-about .about-side .sidebar__block + .sidebar__block {
  margin-top: 22px;
}

.page-about .about-side .sidebar__title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 12px;
}

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

.page-about .about-side .anchor-link {
  display: inline-block;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 13px;
  line-height: 1.3;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-side .anchor-link:hover,
.page-about .about-side .anchor-link:focus-visible {
  color: var(--cyan);
  border-color: var(--about-line);
  background: rgba(53, 230, 224, .06);
}

@media (min-width: 1024px) {
  .page-about .about-side .anchor-list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }

  .page-about .about-side .anchor-link {
    display: block;
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
    padding: 7px 0 7px 12px;
    font-size: 14px;
    background: none;
  }

  .page-about .about-side .anchor-link:hover,
  .page-about .about-side .anchor-link:focus-visible {
    border-left-color: var(--cyan);
    background: none;
  }
}

/* ---------- 章节 ---------- */

.page-about .about-chapter {
  position: relative;
  padding: clamp(42px, 6vw, 80px) 0 clamp(34px, 4vw, 52px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-chapter__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(42px, 6.6vw, 78px);
  line-height: .85;
  letter-spacing: -.05em;
  color: rgba(53, 230, 224, .12);
  -webkit-text-stroke: 1px rgba(53, 230, 224, .42);
  margin-bottom: clamp(14px, 2vw, 22px);
}

.page-about .about-chapter__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(22px, 2.7vw, 33px);
  line-height: 1.22;
  letter-spacing: -.01em;
  margin: 0;
  max-width: 22em;
}

.page-about .about-chapter__lead {
  margin: clamp(14px, 1.8vw, 20px) 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-chapter__foot {
  margin: clamp(22px, 3vw, 32px) 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-chapter__foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 230, 224, .35);
}

.page-about .about-chapter__foot a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 服务对象卡片 ---------- */

.page-about .aud-grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(24px, 3vw, 36px);
}

@media (min-width: 680px) {
  .page-about .aud-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .aud-grid .card {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(158deg, rgba(15, 34, 51, .92), rgba(8, 19, 31, .88));
  overflow: hidden;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .aud-grid .card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--cyan), rgba(140, 108, 255, .5));
  opacity: .55;
}

.page-about .aud-grid .card:hover {
  border-color: var(--about-line);
  transform: translateY(-3px);
}

.page-about .aud-grid .card__body {
  padding: 22px 20px 22px 24px;
}

.page-about .aud-grid .card__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.4;
  margin: 12px 0 0;
  color: var(--text);
}

.page-about .aud-grid .card__text {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .aud-grid .tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  padding: 3px 9px;
  border-radius: var(--radius);
  border: 1px solid currentColor;
}

.page-about .aud-grid .tag--cyan { color: var(--cyan); }
.page-about .aud-grid .tag--violet { color: var(--violet); }
.page-about .aud-grid .tag--orange { color: var(--orange); }

/* ---------- 版本时间轴 ---------- */

.page-about .ver-wrap {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  margin-top: clamp(26px, 3.4vw, 42px);
}

@media (min-width: 1080px) {
  .page-about .ver-wrap {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .about-timeline {
  --tl-pad: 30px;
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 var(--tl-pad);
}

@media (min-width: 768px) {
  .page-about .about-timeline {
    --tl-pad: 46px;
  }
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, rgba(53, 230, 224, .7) 0%, rgba(140, 108, 255, .45) 48%, rgba(53, 230, 224, .06) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: clamp(26px, 3.6vw, 42px);
}

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

.page-about .about-timeline__node {
  position: absolute;
  left: calc(5.5px - var(--tl-pad));
  top: 5px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(8, 19, 31, .9);
  cursor: help;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-timeline__node:hover,
.page-about .about-timeline__node:focus-visible {
  transform: scale(1.35);
  background: var(--cyan);
  outline: none;
}

.page-about .about-timeline__node--current {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(8, 19, 31, .9), 0 0 0 5px rgba(53, 230, 224, .35);
  animation: about-pulse 2.6s var(--ease) infinite;
}

@keyframes about-pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(8, 19, 31, .9), 0 0 0 5px rgba(53, 230, 224, .3); }
  50% { box-shadow: 0 0 0 4px rgba(8, 19, 31, .9), 0 0 0 10px rgba(53, 230, 224, .04); }
}

.page-about .about-timeline__tip {
  position: absolute;
  left: 24px;
  top: -8px;
  z-index: 4;
  width: max-content;
  max-width: min(250px, 56vw);
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
  color: var(--text);
  font-size: 13px;
  line-height: 1.55;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateX(-6px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur) var(--ease);
}

.page-about .about-timeline__node:hover .about-timeline__tip,
.page-about .about-timeline__node:focus-visible .about-timeline__tip {
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
}

.page-about .about-timeline__badge {
  display: inline-block;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--cyan);
  padding: 2px 8px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  background: rgba(53, 230, 224, .07);
}

.page-about .about-timeline__item--current .about-timeline__badge {
  color: var(--ink-900);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-timeline__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(16px, 1.7vw, 19px);
  line-height: 1.45;
  margin: 12px 0 0;
  color: var(--text);
}

.page-about .about-timeline__text {
  margin: 8px 0 0;
  max-width: 48ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .ver-media {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(15, 34, 51, .55);
  padding: 10px;
  margin: 0;
}

.page-about .ver-media .media-frame__inner {
  overflow: hidden;
  border-radius: var(--radius);
}

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

.page-about .ver-media .media-frame__caption {
  margin: 12px 2px 2px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 栏目网格 ---------- */

.page-about .col-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: clamp(24px, 3.2vw, 38px);
}

@media (min-width: 560px) {
  .page-about .col-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-about .col-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .col-card {
  position: relative;
  padding: 20px 18px 20px;
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(15, 34, 51, .94), rgba(8, 19, 31, .9));
  clip-path: polygon(0 0, calc(100% - 15px) 0, 100% 15px, 100% 100%, 0 100%);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .col-card:hover {
  border-color: var(--about-line);
  transform: translateY(-3px);
}

.page-about .col-card__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .col-card__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
  margin: 10px 0 0;
  color: var(--text);
}

.page-about .col-card__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--muted);
}

.page-about .col-media {
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(15, 34, 51, .5);
  padding: 10px;
}

.page-about .col-media .media-frame__inner {
  overflow: hidden;
  border-radius: var(--radius);
}

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

.page-about .col-media .media-frame__caption {
  margin: 12px 2px 2px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 标签页与表格 ---------- */

.page-about .tabs {
  margin-top: clamp(26px, 3.6vw, 42px);
}

.page-about .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 14px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .tabs__tab {
  appearance: none;
  -webkit-appearance: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: transparent;
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.3;
  padding: 8px 16px;
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .tabs__tab:hover {
  color: var(--text);
  border-color: var(--about-line);
}

.page-about .tabs__tab[aria-selected="true"],
.page-about .tabs__tab.is-active {
  color: var(--ink-900);
  background: var(--cyan);
  border-color: var(--cyan);
  font-weight: 700;
}

.page-about .tabs__panel[hidden] {
  display: none;
}

.page-about .table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(15, 34, 51, .5);
  -webkit-overflow-scrolling: touch;
}

.page-about .data-table {
  width: 100%;
  min-width: 540px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .data-table th,
.page-about .data-table td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line-soft);
  vertical-align: top;
  line-height: 1.65;
}

.page-about .data-table th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--ink-800);
  color: var(--cyan-soft);
  font-weight: 600;
  font-size: 12.5px;
  letter-spacing: .06em;
  white-space: nowrap;
}

.page-about .data-table td {
  color: var(--muted);
}

.page-about .data-table td:first-child {
  color: var(--text);
  font-weight: 600;
}

.page-about .data-table tbody tr:last-child td {
  border-bottom: 0;
}

/* ---------- 团队 ---------- */

.page-about .team-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 18px;
  margin-top: clamp(24px, 3.2vw, 38px);
}

@media (min-width: 760px) {
  .page-about .team-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
  }
}

.page-about .team-stat {
  padding: 4px 0 4px 16px;
  border-left: 2px solid var(--cyan);
}

.page-about .team-stat:nth-child(2) { border-left-color: var(--violet); }
.page-about .team-stat:nth-child(3) { border-left-color: var(--orange); }
.page-about .team-stat:nth-child(4) { border-left-color: var(--green); }

.page-about .team-stat b {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--text);
}

.page-about .team-stat span {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
}

.page-about .ops-list {
  list-style: none;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ops-list li {
  position: relative;
  padding-left: 24px;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .ops-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 9px;
  height: 9px;
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
}

/* ---------- 区域与资质 ---------- */

.page-about .region-grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 34px);
}

@media (min-width: 700px) {
  .page-about .region-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .region-card {
  padding: 22px 20px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(150deg, rgba(15, 34, 51, .92), rgba(8, 19, 31, .86));
}

.page-about .region-card__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .region-card__value {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(20px, 2.4vw, 28px);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .region-card__value--code {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(15px, 1.8vw, 19px);
  letter-spacing: .02em;
  color: var(--cyan);
  word-break: break-all;
}

.page-about .region-card__hint {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .region-card .btn {
  margin-top: 16px;
}

/* ---------- 底部按钮 ---------- */

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(26px, 3.4vw, 38px);
}

.page-about .about-links .btn {
  display: inline-block;
  padding: 11px 22px;
  border-radius: var(--radius);
  font-size: 14.5px;
  line-height: 1.3;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .btn--primary {
  background: var(--cyan);
  color: var(--ink-900);
  font-weight: 700;
  border-color: var(--cyan);
}

.page-about .btn--primary:hover {
  background: var(--cyan-soft);
  border-color: var(--cyan-soft);
}

.page-about .btn--ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--line);
}

.page-about .btn--ghost:hover {
  color: var(--cyan);
  border-color: var(--about-line);
}

.page-about .btn--sm {
  padding: 8px 15px;
  font-size: 13px;
  cursor: pointer;
  font-family: var(--font-body);
}

/* ---------- 入场与无障碍 ---------- */

.page-about [data-reveal] {
  transition: opacity var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease);
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
  }
}

.page-about .about-timeline__node:focus-visible,
.page-about .about-links .btn:focus-visible,
.page-about .tabs__tab:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}
<<<END>>>