.page-about {
  --pa-card-pad: clamp(18px, 2.6vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(16px, 3vw, 32px);
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
  align-items: center;
}

@media (min-width: 920px) {
  .page-about .about-hero-grid {
    grid-template-columns: 7fr 5fr;
  }
}

.page-about .hero-copy h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 6.2vw, 54px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 10px 0 0;
  color: var(--text);
}

.page-about .hero-lead {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .hero-visual {
  position: relative;
  padding: 18px;
  min-height: 240px;
  border: 2px solid var(--line);
  border-radius: var(--radius-panel);
  background: linear-gradient(160deg, var(--panel-2) 0%, var(--panel) 58%, var(--ink) 100%);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .hero-svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .hero-float {
  position: absolute;
  right: 16px;
  bottom: 16px;
  display: grid;
  gap: 2px;
  padding: 10px 14px;
  border: 2px solid var(--cyan);
  border-radius: 10px;
  background: var(--ink);
}

.page-about .hero-float-num {
  font-family: var(--font-num);
  font-size: 34px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .hero-float-label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .hero-metrics {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

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

.page-about .metric {
  display: grid;
  gap: 6px;
  padding: 14px 16px;
  border: 2px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
}

.page-about .metric-num {
  font-family: var(--font-num);
  font-size: clamp(28px, 5vw, 42px);
  line-height: 1;
  color: var(--text);
}

.page-about .metric-label {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .hero-banner {
  margin: clamp(28px, 5vw, 52px) 0 0;
}

.page-about .hero-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 3;
  object-fit: cover;
  border: 2px solid var(--line);
  border-radius: var(--radius-panel);
  box-shadow: var(--shadow-hard);
}

/* ---------- 章节标题 ---------- */
.page-about .sec-head {
  max-width: 62ch;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .section-title {
  margin: 8px 0 0;
  line-height: 1.1;
  letter-spacing: -0.015em;
}

.page-about .sec-lead {
  margin: 14px 0 0;
  font-size: 17px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .axis-track {
  list-style: none;
  position: relative;
  margin: 0;
  padding: 0 0 0 30px;
}

.page-about .axis-track::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--line) 55%, transparent 100%);
}

.page-about .axis-item {
  position: relative;
  margin-bottom: 20px;
}

.page-about .axis-item:last-child {
  margin-bottom: 0;
}

.page-about .axis-item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 22px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
  transition: transform 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .axis-item:hover::before,
.page-about .axis-item:focus-within::before {
  transform: scale(1.4);
  border-color: var(--cyan-soft);
}

@media (min-width: 900px) {
  .page-about .axis-track {
    padding-left: 72px;
  }
  .page-about .axis-track::before {
    left: 16px;
  }
  .page-about .axis-item::before {
    left: -62px;
    top: 24px;
    width: 14px;
    height: 14px;
  }
  .page-about .axis-item:nth-child(even) .stage-card {
    margin-left: clamp(40px, 14%, 160px);
  }
}

.page-about .stage-card {
  border: 2px solid var(--line);
  border-radius: var(--radius-panel);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
  transition: transform 180ms var(--ease), border-color 180ms var(--ease),
    box-shadow 180ms var(--ease), background-color 180ms var(--ease);
}

.page-about .stage-card:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
  box-shadow: var(--shadow-hard-hover);
}

.page-about .stage-card[open] {
  border-color: var(--cyan);
  background: var(--panel-2);
}

.page-about .stage-head {
  display: grid;
  grid-template-columns: auto auto 1fr auto;
  grid-template-areas: "num year mark mark" "title title title title";
  gap: 6px 12px;
  align-items: center;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .stage-head::-webkit-details-marker {
  display: none;
}

.page-about .stage-num {
  grid-area: num;
  font-family: var(--font-num);
  font-size: 20px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .stage-year {
  grid-area: year;
  font-family: var(--font-num);
  font-size: 20px;
  line-height: 1;
  color: var(--muted);
}

.page-about .stage-title {
  grid-area: title;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 3.4vw, 25px);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .stage-mark {
  grid-area: mark;
  justify-self: end;
  position: relative;
  width: 16px;
  height: 16px;
}

.page-about .stage-mark::before,
.page-about .stage-mark::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  border-radius: 1px;
  transition: transform 220ms var(--ease);
}

.page-about .stage-mark::before {
  left: 0;
  right: 0;
  top: 7px;
  height: 2px;
}

.page-about .stage-mark::after {
  top: 0;
  bottom: 0;
  left: 7px;
  width: 2px;
}

.page-about .stage-card[open] .stage-mark::after {
  transform: scaleY(0);
}

.page-about .stage-body {
  padding: 0 18px 20px;
}

.page-about .stage-body p {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

@media (min-width: 900px) {
  .page-about .stage-head {
    grid-template-columns: auto auto 1fr auto;
    grid-template-areas: "num year title mark";
    padding: 22px 26px;
  }
  .page-about .stage-num,
  .page-about .stage-year {
    font-size: 26px;
  }
  .page-about .stage-body {
    padding: 0 26px 24px;
  }
}

/* ---------- 服务卡 ---------- */
.page-about .svc-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 840px) {
  .page-about .svc-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .svc-card {
  padding: var(--pa-card-pad);
  border: 2px solid var(--line);
  border-radius: var(--radius-panel);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
  transition: transform 180ms var(--ease), border-color 180ms var(--ease),
    box-shadow 180ms var(--ease);
}

.page-about .svc-card:hover,
.page-about .svc-card:focus-within {
  transform: translateY(-2px);
  border-color: var(--cyan);
  box-shadow: var(--shadow-hard-hover);
}

.page-about .svc-card h3 {
  margin: 14px 0 10px;
  font-size: clamp(19px, 3vw, 23px);
  line-height: 1.3;
  color: var(--text);
}

.page-about .svc-card p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .svc-fact {
  margin-top: 16px !important;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 14px !important;
  letter-spacing: 0.04em;
  color: var(--dim) !important;
}

.page-about .svc-fact .num {
  font-family: var(--font-num);
  font-size: 20px;
  color: var(--cyan);
  margin-right: 6px;
}

/* ---------- 覆盖范围 ---------- */
.page-about .coverage-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

@media (min-width: 920px) {
  .page-about .coverage-grid {
    grid-template-columns: 5fr 7fr;
    align-items: start;
  }
}

.page-about .coverage-figure {
  margin: clamp(22px, 3vw, 30px) 0 0;
}

.page-about .coverage-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 2px solid var(--line);
  border-radius: var(--radius-panel);
  box-shadow: var(--shadow-hard);
}

.page-about .coverage-sub {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--text);
}

.page-about .coverage-strip {
  list-style: none;
  margin: 0;
  padding: 0 0 16px;
  display: flex;
  gap: 12px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .coverage-strip > li {
  flex: 0 0 auto;
  scroll-snap-align: start;
}

.page-about .region-chip {
  display: grid;
  gap: 7px;
  min-width: 178px;
  padding: 16px;
  border: 2px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  color: var(--text);
  text-decoration: none;
  transition: transform 180ms var(--ease), border-color 180ms var(--ease),
    box-shadow 180ms var(--ease), background-color 180ms var(--ease);
}

.page-about .region-chip:hover,
.page-about .region-chip:focus-visible {
  transform: translateY(-2px);
  border-color: var(--cyan);
  box-shadow: var(--shadow-hard);
}

.page-about .region-chip:target {
  border-color: var(--cyan);
  background: var(--panel-2);
  box-shadow: var(--shadow-hard);
}

.page-about .chip-region {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.01em;
}

.page-about .chip-row {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .chip-row .num {
  font-family: var(--font-num);
  font-size: 19px;
  line-height: 1;
  color: var(--cyan);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

@media (min-width: 980px) {
  .page-about .team-grid {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }
}

.page-about .team-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 30px);
}

@media (min-width: 700px) {
  .page-about .team-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .team-card {
  padding: 18px 20px;
  border: 2px solid var(--line);
  border-radius: var(--radius-panel);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
  transition: transform 180ms var(--ease), border-color 180ms var(--ease),
    box-shadow 180ms var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  transform: translateY(-2px);
  border-color: var(--cyan);
  box-shadow: var(--shadow-hard-hover);
}

.page-about .team-count {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--amber);
  border: 1px solid var(--line);
  border-radius: var(--radius-capsule);
  padding: 3px 10px;
}

.page-about .team-count .num {
  font-family: var(--font-num);
  font-size: 15px;
}

.page-about .team-card h3 {
  margin: 14px 0 8px;
  font-size: 18px;
  line-height: 1.3;
  color: var(--text);
}

.page-about .team-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

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

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

.page-about .team-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 2px solid var(--line);
  border-radius: var(--radius-panel);
  box-shadow: var(--shadow-hard);
}

.page-about .side-note {
  margin: 0;
  padding-left: 16px;
  border-left: 3px solid var(--cyan);
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 版本线 ---------- */
.page-about .version-track {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 880px) {
  .page-about .version-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .version-col {
  padding: 20px 22px 24px;
  border: 2px solid var(--line);
  border-top: 4px solid var(--cyan);
  border-radius: var(--radius-panel);
  background: var(--panel);
}

.page-about .version-line {
  display: block;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .version-col h3 {
  margin: 8px 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 21px;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .version-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .version-list li {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .version-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .version-list strong {
  display: block;
  margin-bottom: 4px;
  font-size: 16px;
  color: var(--text);
}

/* ---------- 长期承诺 ---------- */
.page-about .promise-band {
  padding: clamp(22px, 4vw, 46px);
  border: 2px solid var(--line);
  border-radius: var(--radius-panel);
  background: linear-gradient(155deg, var(--panel-2) 0%, var(--panel) 55%, var(--ink) 100%);
  box-shadow: var(--shadow-hard);
}

.page-about .promise-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: clamp(24px, 3.4vw, 34px);
}

@media (min-width: 840px) {
  .page-about .promise-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .promise-item {
  padding-left: 16px;
  border-left: 3px solid var(--c, var(--cyan));
}

.page-about .promise-item:nth-child(1) {
  --c: var(--cyan);
}

.page-about .promise-item:nth-child(2) {
  --c: var(--amber);
}

.page-about .promise-item:nth-child(3) {
  --c: var(--orange);
}

.page-about .promise-item h3 {
  margin: 0 0 10px;
  font-size: 18px;
  line-height: 1.35;
  color: var(--text);
}

.page-about .promise-item p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .promise-foot {
  margin: clamp(24px, 3vw, 32px) 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 正文链接与焦点 ---------- */
.page-about p a,
.page-about li a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about p a:hover,
.page-about li a:hover {
  color: var(--cyan-soft);
}

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--cyan-soft);
  outline-offset: 2px;
  border-radius: 4px;
}

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