.page-about {
  --about-band: clamp(56px, 8vw, 104px);
  --about-hair: rgba(74, 107, 96, 0.22);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 3.5vw, 38px) 0 clamp(22px, 3.5vw, 40px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -12% auto -12%;
  height: 130%;
  background:
    radial-gradient(48% 42% at 16% 32%, rgba(0, 245, 200, 0.14), transparent 72%),
    radial-gradient(38% 40% at 86% 8%, rgba(122, 92, 255, 0.13), transparent 74%),
    radial-gradient(30% 34% at 62% 88%, rgba(255, 180, 67, 0.08), transparent 76%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero > .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-title {
  margin: 12px 0 0;
  max-width: 17em;
  font-size: clamp(30px, 5.4vw, 60px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-lede {
  margin-top: clamp(16px, 2vw, 24px);
  max-width: 60ch;
  color: var(--muted);
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.85;
}

.page-about .about-figures {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-figures li {
  background: var(--panel);
  padding: 18px 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-figure-num {
  font-size: clamp(24px, 3.2vw, 36px);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .about-figures li:nth-child(3) .about-figure-num {
  color: var(--amber);
}

.page-about .about-figure-label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

@media (min-width: 800px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 横幅图 ---------- */
.page-about .about-banner {
  margin: clamp(24px, 3.4vw, 40px) auto 0;
  max-width: var(--maxw);
  padding: 0 var(--gutter);
  box-sizing: border-box;
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border: 1px solid var(--line-soft);
  border-radius: 3px;
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(32px, 5vw, 48px);
  padding-top: clamp(40px, 6vw, 72px);
  padding-bottom: var(--about-band);
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: clamp(36px, 4.5vw, 68px);
    align-items: start;
  }
}

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

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  display: none;
}

@media (min-width: 1000px) {
  .page-about .about-index {
    display: block;
    position: sticky;
    top: calc(var(--topbar-h) + 26px);
    align-self: start;
    padding-left: 18px;
    border-left: 1px solid var(--line-soft);
  }
}

.page-about .about-index-title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-about .about-index nav {
  display: grid;
}

.page-about .about-index a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0;
  font-size: 14px;
  line-height: 1.5;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid var(--about-hair);
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-index a:hover {
  color: var(--text);
  border-bottom-color: rgba(0, 245, 200, 0.45);
}

.page-about .about-index a[aria-current="true"] {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-index-num {
  font-size: 11px;
  color: var(--line);
}

.page-about .about-index a[aria-current="true"] .about-index-num {
  color: var(--cyan);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  scroll-margin-top: calc(var(--topbar-h) + 24px);
}

.page-about .about-section + .about-section {
  margin-top: clamp(48px, 7vw, 88px);
  padding-top: clamp(32px, 4vw, 52px);
  border-top: 1px solid var(--about-hair);
}

.page-about .about-section h2 {
  margin: 10px 0 16px;
  font-size: clamp(23px, 3.4vw, 36px);
  font-weight: 850;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-section > p {
  max-width: 62ch;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .about-section p a,
.page-about .about-filing-note a,
.page-about .about-desk-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 245, 200, 0.4);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-section p a:hover,
.page-about .about-filing-note a:hover,
.page-about .about-desk-note a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 三条业务线 ---------- */
.page-about .about-tracks {
  margin-top: clamp(24px, 3.2vw, 36px);
  display: grid;
  gap: 16px;
}

@media (min-width: 720px) {
  .page-about .about-tracks {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-track--query {
    grid-column: 1 / -1;
  }
}

.page-about .about-track {
  padding: 22px 20px 24px;
  min-width: 0;
}

.page-about .about-track h3 {
  margin: 12px 0 10px;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--text);
}

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

.page-about .about-track--query {
  background: var(--panel);
  border-top: 2px solid var(--cyan);
  border-radius: 2px;
}

.page-about .about-track--data {
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-card);
}

@media (min-width: 720px) {
  .page-about .about-track--query {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    padding: 26px 24px 28px;
    background: linear-gradient(115deg, var(--panel) 0%, var(--panel-2) 100%);
  }
}

.page-about .about-track--expert {
  background: var(--violet-deep);
  border-left: 4px solid var(--violet);
  border-radius: 0 12px 12px 0;
}

/* ---------- 数据覆盖 ---------- */
.page-about .about-coverage-grid {
  margin-top: clamp(22px, 3vw, 32px);
  display: grid;
  gap: clamp(20px, 3vw, 30px);
  align-items: start;
}

@media (min-width: 900px) {
  .page-about .about-coverage-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }
}

.page-about .about-coverage-figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-coverage-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--line-soft);
  border-radius: 16px;
}

.page-about .about-coverage-figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  padding-left: 12px;
  border-left: 2px solid var(--cyan);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(24px, 3.2vw, 36px) 0 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--violet) 0%, rgba(122, 92, 255, 0.12) 100%);
}

.page-about .about-node {
  position: relative;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 18px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 2px solid var(--violet);
  background: var(--ink);
  transition: background 0.26s var(--ease), border-color 0.26s var(--ease), box-shadow 0.26s var(--ease);
}

.page-about .about-node:has(> details[open])::before {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(0, 245, 200, 0.14);
}

.page-about .about-node > details {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-node summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  padding: 14px 0;
  color: var(--text);
  transition: color 0.22s var(--ease);
}

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

.page-about .about-node summary::after {
  content: "＋";
  margin-left: auto;
  font-size: 14px;
  color: var(--line);
  transition: transform 0.24s var(--ease), color 0.24s var(--ease);
}

.page-about .about-node details[open] > summary::after {
  content: "－";
  color: var(--cyan);
}

.page-about .about-node summary:hover {
  color: var(--cyan);
}

.page-about .about-node-ver {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--violet);
}

.page-about .about-node-year {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--line);
}

.page-about .about-node-title {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  flex: 1 1 12em;
  min-width: 0;
}

.page-about .about-node details > p {
  margin: 0 0 18px;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

@media (min-width: 720px) {
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-team li {
  min-width: 0;
  padding: 20px 18px 22px;
  background: var(--panel);
  border-top: 2px solid var(--line);
  transition: transform 0.26s var(--ease), border-color 0.26s var(--ease);
}

.page-about .about-team li:hover {
  transform: translateY(-2px);
  border-top-color: var(--cyan);
}

.page-about .about-team-num {
  display: block;
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--cyan);
  line-height: 1.1;
}

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

.page-about .about-team p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-team-figure {
  margin: clamp(24px, 3.2vw, 34px) 0 0;
}

.page-about .about-team-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  border: 1px solid var(--line-soft);
  border-radius: 3px;
  background: var(--panel);
}

.page-about .about-desk {
  margin-top: clamp(24px, 3.2vw, 34px);
  padding: clamp(22px, 3vw, 30px);
  background: linear-gradient(100deg, var(--violet-deep) 0%, rgba(27, 17, 64, 0.35) 70%, transparent 100%);
  border-left: 4px solid var(--violet);
  border-radius: 0 14px 14px 0;
}

.page-about .about-desk h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
}

.page-about .about-desk > p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(233, 251, 243, 0.82);
}

.page-about .about-series {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-series li {
  padding: 6px 14px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--text);
  border: 1px solid rgba(122, 92, 255, 0.55);
  border-radius: var(--r-pill);
  background: rgba(122, 92, 255, 0.12);
}

.page-about .about-desk-note {
  margin-top: 16px !important;
  font-size: 14px !important;
}

/* ---------- 服务规模 ---------- */
.page-about .about-scale {
  margin-top: clamp(22px, 3vw, 32px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

@media (min-width: 800px) {
  .page-about .about-scale {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-scale-item {
  background: var(--ink);
  padding: 22px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.page-about .about-scale-num {
  font-size: clamp(22px, 2.8vw, 32px);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
  line-height: 1.1;
  border-bottom: 2px solid var(--cyan);
  padding-bottom: 8px;
  align-self: flex-start;
}

.page-about .about-scale-label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-partners {
  margin-top: clamp(22px, 3vw, 32px);
  padding-left: 18px;
  border-left: 2px solid var(--amber);
}

.page-about .about-partners p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

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

.page-about .about-partners strong {
  color: var(--amber);
  font-weight: 700;
}

/* ---------- 备案 ---------- */
.page-about .about-filing {
  margin-top: clamp(22px, 3vw, 32px);
  padding: clamp(22px, 3vw, 32px);
  border: 1px solid var(--line);
  border-radius: 3px;
  background: linear-gradient(140deg, var(--panel) 0%, var(--ink) 82%);
  display: grid;
  gap: 16px;
}

.page-about .about-filing-row {
  display: grid;
  gap: 6px;
  padding-bottom: 14px;
  border-bottom: 1px dashed rgba(74, 107, 96, 0.4);
}

.page-about .about-filing-row:last-of-type {
  padding-bottom: 0;
  border-bottom: 0;
}

@media (min-width: 640px) {
  .page-about .about-filing-row {
    grid-template-columns: 130px minmax(0, 1fr);
    align-items: baseline;
    gap: 18px;
  }
}

.page-about .about-filing-label {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .about-filing-value {
  font-size: 15px;
  font-weight: 700;
  color: var(--cyan);
  word-break: break-word;
}

.page-about .about-filing-row:last-of-type .about-filing-value {
  color: var(--text);
  font-family: var(--font-body);
  font-weight: 600;
}

.page-about .about-filing-note {
  margin: 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  position: relative;
  margin-top: clamp(48px, 7vw, 88px);
  padding: clamp(26px, 4vw, 48px);
  border: 1px solid var(--line-soft);
  border-radius: 3px;
  background: linear-gradient(120deg, var(--panel-2) 0%, var(--panel) 58%, var(--ink) 100%);
  overflow: hidden;
}

.page-about .about-cta::after {
  content: "";
  position: absolute;
  right: -12%;
  top: -60%;
  width: 58%;
  height: 220%;
  background: linear-gradient(200deg, rgba(0, 245, 200, 0.16), transparent 62%);
  transform: rotate(14deg);
  pointer-events: none;
}

.page-about .about-cta h2 {
  margin: 10px 0 14px;
  font-size: clamp(22px, 3.2vw, 32px);
  font-weight: 850;
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--text);
  position: relative;
  z-index: 1;
}

.page-about .about-cta > p {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
  position: relative;
  z-index: 1;
}

.page-about .about-cta-actions {
  margin-top: clamp(20px, 3vw, 30px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  position: relative;
  z-index: 1;
}

@media (max-width: 520px) {
  .page-about .about-cta-actions .btn {
    width: 100%;
    text-align: center;
  }
}

/* ---------- 窄屏保护 ---------- */
@media (max-width: 480px) {
  .page-about .about-title {
    font-size: 28px;
  }

  .page-about .about-node-title {
    font-size: 15px;
  }

  .page-about .about-node-ver {
    font-size: 14px;
  }

  .page-about .about-banner img {
    aspect-ratio: 16 / 9;
  }

  .page-about .table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team li:hover {
    transform: none;
  }
}