.page-about {
  --ab-rail: rgba(46, 242, 216, 0.35);
  --ab-tl-line: linear-gradient(180deg, rgba(46, 242, 216, 0.55), rgba(30, 79, 168, 0.45), rgba(255, 106, 31, 0.35));
}

/* ---------- 首屏 ---------- */
.page-about .ab-intro {
  padding-top: 8px;
}
.page-about .breadcrumbs {
  margin-bottom: 24px;
}
.page-about .ab-intro-grid {
  display: grid;
  gap: 24px;
}
.page-about .ab-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 14px;
}
.page-about h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 7vw, 56px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--cream);
  margin: 0 0 18px;
  transform: skewX(-3deg);
  transform-origin: left bottom;
}
.page-about .ab-lead-text {
  color: var(--mist);
  font-size: 16px;
  line-height: 1.8;
  max-width: 46ch;
  margin: 0 0 22px;
}
.page-about .ab-intro-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-intro-board {
  padding: 22px 20px;
  border-radius: var(--r-lg);
  background-image: linear-gradient(160deg, rgba(30, 79, 168, 0.35), rgba(10, 20, 48, 0.9));
  position: relative;
  overflow: hidden;
}
.page-about .ab-intro-board::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(46, 242, 216, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(46, 242, 216, 0.07) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}
.page-about .ab-board-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cyan);
  margin: 0 0 16px;
  position: relative;
  z-index: 1;
}
.page-about .ab-board-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  position: relative;
  z-index: 1;
}
.page-about .ab-board-list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}
.page-about .ab-board-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about .ab-board-num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 28px;
  line-height: 1;
  color: var(--cream);
  min-width: 4.2em;
  letter-spacing: -0.02em;
}
.page-about .ab-board-num em {
  font-style: normal;
  font-size: 14px;
  color: var(--cyan);
  margin-left: 3px;
}
.page-about .ab-board-label {
  color: var(--mist);
  font-size: 13.5px;
  line-height: 1.5;
}
.page-about .ab-board-note {
  position: relative;
  z-index: 1;
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-size: 12.5px;
  color: var(--mist);
}

/* ---------- 章节头 ---------- */
.page-about .ab-sec-head {
  margin-bottom: 26px;
}
.page-about .ab-sec-index {
  font-size: 13px;
  letter-spacing: 0.3em;
  color: var(--orange);
  margin: 0 0 8px;
}
.page-about .ab-sec-head h2,
.page-about .ab-hub-text h2,
.page-about .ab-next-main h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 5.4vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--cream);
  margin: 0 0 12px;
}
.page-about .ab-hub-text h2 {
  transform: skewX(-3deg);
  transform-origin: left bottom;
  display: inline-block;
}
.page-about .ab-sec-sub {
  color: var(--mist);
  font-size: 15px;
  line-height: 1.8;
  max-width: 62ch;
  margin: 0;
}

/* ---------- 业务范围 ---------- */
.page-about .ab-svc-grid {
  display: grid;
  gap: 16px;
}
.page-about .ab-svc-card {
  padding: 20px 18px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  position: relative;
  transition: border-color 0.28s ease, transform 0.28s ease;
}
.page-about .ab-svc-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 42px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}
.page-about .ab-svc-card:hover {
  border-color: var(--glass-line);
  transform: translateY(-3px);
}
.page-about .ab-svc-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--cream);
  margin: 12px 0 8px;
  line-height: 1.45;
}
.page-about .ab-svc-card p {
  margin: 0;
  color: var(--mist);
  font-size: 14.5px;
  line-height: 1.75;
}

/* ---------- 时间线 ---------- */
.page-about .ab-tl-filter {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  margin-bottom: 22px;
  scrollbar-width: none;
}
.page-about .ab-tl-filter::-webkit-scrollbar {
  display: none;
}
.page-about .ab-tl-list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  position: relative;
}
.page-about .ab-tl-list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: var(--ab-tl-line);
  border-radius: 2px;
}
.page-about .ab-tl-node {
  position: relative;
  margin-bottom: 14px;
}
.page-about .ab-tl-node[hidden] {
  display: none;
}
.page-about .ab-tl-item {
  background: var(--field);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: border-color 0.28s ease, box-shadow 0.28s ease;
}
.page-about .ab-tl-item[open] {
  border-color: var(--glass-line);
  box-shadow: 0 0 0 1px rgba(46, 242, 216, 0.14), 0 12px 30px rgba(7, 16, 33, 0.6);
}
.page-about .ab-tl-node::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 22px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--midnight);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 12px rgba(46, 242, 216, 0.6);
}
.page-about .ab-tl-node:nth-child(even)::before {
  border-color: var(--orange);
  box-shadow: 0 0 12px rgba(255, 106, 31, 0.5);
}
.page-about .ab-tl-item summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 16px;
  cursor: pointer;
  list-style: none;
}
.page-about .ab-tl-item summary::-webkit-details-marker {
  display: none;
}
.page-about .ab-tl-item summary:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: -2px;
}
.page-about .ab-tl-dot {
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--cyan);
  transform: rotate(45deg);
  flex: none;
}
.page-about .ab-tl-node:nth-child(even) .ab-tl-dot {
  background: var(--orange);
}
.page-about .ab-tl-meta {
  font-size: 12px;
  color: var(--mist);
  letter-spacing: 0.12em;
  flex: none;
}
.page-about .ab-tl-title {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--cream);
  line-height: 1.5;
}
.page-about .ab-tl-item .accordion-body {
  padding: 0 16px 18px;
  color: var(--mist);
  font-size: 14.5px;
  line-height: 1.8;
}
.page-about .ab-tl-item .accordion-body p {
  margin: 0;
}
.page-about .ab-tl-figure {
  margin: 26px 0 0;
}
.page-about .ab-tl-figure .media-frame {
  border-radius: var(--r-lg);
  border: 1px solid var(--glass-line);
  overflow: hidden;
}

/* ---------- 团队 ---------- */
.page-about .ab-team-figure {
  margin: 0 0 20px;
}
.page-about .ab-team-figure .media-frame {
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
}
.page-about .ab-team-grid {
  display: grid;
  gap: 16px;
}
.page-about .ab-team-card {
  padding: 22px 20px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: linear-gradient(175deg, rgba(18, 34, 77, 0.95), rgba(10, 20, 48, 0.95));
  transition: border-color 0.28s ease, transform 0.28s ease;
}
.page-about .ab-team-card:hover,
.page-about .ab-team-card:focus-visible {
  border-color: var(--cyan);
  transform: translateY(-3px);
  outline: none;
}
.page-about .ab-team-card:focus-visible {
  box-shadow: 0 0 0 2px var(--amber);
}
.page-about .ab-team-num {
  font-size: 26px;
  font-weight: 800;
  color: var(--cyan);
  margin: 0 0 10px;
  display: inline-block;
}
.page-about .ab-team-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--cream);
  margin: 0 0 10px;
}
.page-about .ab-team-card p {
  margin: 0 0 14px;
  color: var(--mist);
  font-size: 14.5px;
  line-height: 1.8;
}
.page-about .ab-team-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 7px;
  border-top: 1px dashed var(--line);
  padding-top: 14px;
}
.page-about .ab-team-list li {
  position: relative;
  padding-left: 16px;
  font-size: 13.5px;
  color: var(--mist);
  line-height: 1.6;
}
.page-about .ab-team-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--brand-blue);
  box-shadow: 0 0 0 2px rgba(30, 79, 168, 0.25);
}

/* ---------- 服务中心 ---------- */
.page-about .ab-hub-grid {
  display: grid;
  gap: 20px;
}
.page-about .ab-hub-media .media-frame {
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
}
.page-about .ab-hub-text {
  padding: 24px 20px;
  border-radius: var(--r-lg);
  border: 1px solid var(--glass-line);
}
.page-about .ab-hub-text > p {
  color: var(--mist);
  font-size: 15px;
  line-height: 1.8;
  margin: 0 0 18px;
}
.page-about .ab-hub-tasks {
  display: grid;
  gap: 12px;
  margin-bottom: 20px;
}
.page-about .ab-hub-task {
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.page-about .ab-hub-task p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}
.page-about .ab-hub-task strong {
  color: var(--cream);
  font-weight: 700;
}
.page-about .ab-hub-dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-top: 8px;
}
.page-about .ab-hub-dot-cyan {
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(46, 242, 216, 0.7);
}
.page-about .ab-hub-dot-orange {
  background: var(--orange);
  box-shadow: 0 0 10px rgba(255, 106, 31, 0.6);
}
.page-about .ab-hub-dot-green {
  background: var(--green);
  box-shadow: 0 0 10px rgba(67, 217, 138, 0.6);
}
.page-about .ab-hub-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 覆盖范围 ---------- */
.page-about .ab-cover-grid {
  display: grid;
  gap: 18px;
}
.page-about .ab-cover-stats {
  padding: 22px 20px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 14px;
}
.page-about .ab-cover-stats .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.page-about .ab-cover-stats .stat-num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 8vw, 46px);
  line-height: 1;
  color: var(--cream);
  letter-spacing: -0.03em;
}
.page-about .ab-cover-stats .stat-num em {
  font-style: normal;
  font-size: 0.5em;
  color: var(--cyan);
  margin-left: 2px;
}
.page-about .ab-cover-stats .stat-label {
  font-size: 13px;
  color: var(--mist);
  line-height: 1.5;
}
.page-about .ab-cover-chart {
  padding: 22px 20px;
  border-radius: var(--r-lg);
  border: 1px solid var(--glass-line);
}
.page-about .ab-chart-title {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
  margin: 0 0 18px;
}
.page-about .ab-bars {
  display: grid;
  gap: 14px;
}
.page-about .ab-bar-row {
  display: grid;
  grid-template-columns: 5.4em minmax(0, 1fr) 3.2em;
  align-items: center;
  gap: 10px;
}
.page-about .ab-bar-name {
  font-size: 12.5px;
  color: var(--mist);
}
.page-about .ab-bar-track {
  height: 8px;
  border-radius: 4px;
  background: rgba(168, 187, 221, 0.14);
  overflow: hidden;
}
.page-about .ab-bar-fill {
  display: block;
  height: 100%;
  width: var(--w, 0%);
  border-radius: 4px;
  animation: ab-grow 0.7s ease-out both;
}
.page-about .ab-fill-cyan {
  background: linear-gradient(90deg, rgba(46, 242, 216, 0.5), var(--cyan));
}
.page-about .ab-fill-orange {
  background: linear-gradient(90deg, rgba(255, 106, 31, 0.45), var(--orange));
}
.page-about .ab-fill-amber {
  background: linear-gradient(90deg, rgba(255, 194, 74, 0.45), var(--amber));
}
.page-about .ab-bar-val {
  font-size: 12.5px;
  color: var(--cream);
  text-align: right;
}
@keyframes ab-grow {
  from {
    transform: scaleX(0);
    transform-origin: left center;
  }
  to {
    transform: scaleX(1);
    transform-origin: left center;
  }
}
.page-about .ab-chart-note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-size: 12.5px;
  color: var(--mist);
  line-height: 1.7;
}
.page-about .ab-cover-notes {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}
.page-about .ab-note {
  padding: 18px 16px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  border-left: 3px solid var(--brand-blue);
}
.page-about .ab-note h3 {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--cream);
  margin: 0 0 8px;
}
.page-about .ab-note p {
  margin: 0;
  font-size: 13.5px;
  color: var(--mist);
  line-height: 1.75;
}

/* ---------- 下一步 ---------- */
.page-about .ab-next {
  padding-bottom: 56px;
}
.page-about .ab-next-grid {
  display: grid;
  gap: 20px;
}
.page-about .ab-next-main {
  padding: 24px 20px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
}
.page-about .ab-next-main h2 {
  margin-bottom: 20px;
}
.page-about .ab-next-main .step {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px 0;
  border-top: 1px dashed var(--line);
}
.page-about .ab-next-main .step-num {
  font-size: 14px;
  color: var(--cyan);
  letter-spacing: 0.1em;
  flex: none;
  padding-top: 3px;
}
.page-about .ab-next-main .step h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--cream);
  margin: 0 0 6px;
}
.page-about .ab-next-main .step p {
  margin: 0;
  font-size: 14px;
  color: var(--mist);
  line-height: 1.75;
}
.page-about .ab-next-side {
  display: grid;
  gap: 10px;
  align-content: start;
}
.page-about .ab-next-link {
  display: block;
  padding: 16px 18px;
  border-radius: var(--r-md);
  border: 1px solid rgba(46, 242, 216, 0.3);
  background: linear-gradient(120deg, rgba(30, 79, 168, 0.4), rgba(18, 34, 77, 0.7));
  color: var(--cream);
  font-size: 14.5px;
  font-weight: 600;
  text-decoration: none;
  transition: border-color 0.26s ease, transform 0.26s ease, box-shadow 0.26s ease;
}
.page-about .ab-next-link:hover,
.page-about .ab-next-link:focus-visible {
  border-color: var(--cyan);
  transform: translateY(-2px);
  box-shadow: 0 0 0 1px rgba(46, 242, 216, 0.25), 0 10px 26px rgba(7, 16, 33, 0.6);
  outline: none;
}

/* ---------- 通用媒体 ---------- */
.page-about .media {
  margin: 0;
}
.page-about .media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}
.page-about .media-caption {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--mist);
  letter-spacing: 0.02em;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-svc-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-cover-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .ab-cover-notes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-intro-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
    gap: 36px;
  }
  .page-about .ab-svc-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }
  .page-about .ab-svc-card:nth-child(2) {
    transform: translateY(18px);
  }
  .page-about .ab-svc-card:nth-child(2):hover {
    transform: translateY(14px);
  }
  .page-about .ab-team-grid {
    grid-template-columns: 5fr 4fr 3fr;
  }
  .page-about .ab-hub-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: stretch;
    gap: 28px;
  }
  .page-about .ab-hub-media {
    height: 100%;
  }
  .page-about .ab-hub-media .media {
    height: 100%;
  }
  .page-about .ab-hub-media .media-frame {
    height: 100%;
  }
  .page-about .ab-cover-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: 22px;
  }
  .page-about .ab-tl-figure {
    margin-top: 32px;
  }
  .page-about .ab-next-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: 24px;
  }
  .page-about .ab-next-main {
    padding: 30px 28px;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-team-grid {
    grid-template-columns: 5fr 4fr 3fr;
    gap: 18px;
  }
  .page-about .ab-hub-text {
    padding: 32px 30px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-bar-fill {
    animation: none;
  }
  .page-about .ab-svc-card,
  .page-about .ab-team-card,
  .page-about .ab-next-link {
    transition: none;
  }
}
</main>

.page-about {
  --w: 1rem;
}