.page-about {
  --about-body-on-paper: rgba(11, 14, 28, 0.78);
  --about-rule-on-paper: rgba(11, 14, 28, 0.12);
  background: var(--ink-950);
  color: var(--paper);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: calc(var(--header-h) + 22px);
}

.page-about .breadcrumb {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--steel);
}

.page-about .breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  color: var(--line-strong);
}

.page-about .breadcrumb a {
  color: var(--steel);
  text-decoration: none;
  transition: color 0.24s var(--ease);
}

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

.page-about .breadcrumb [aria-current="page"] {
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-intro {
  position: relative;
  padding: 38px 0 58px;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.page-about .about-intro::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size: 96px 96px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 92%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 92%);
  pointer-events: none;
}

.page-about .about-intro-inner {
  position: relative;
  z-index: 1;
}

.page-about .about-intro .label {
  color: var(--cyan);
}

.page-about .about-intro h1 {
  margin: 16px 0 0;
  max-width: 900px;
  font-size: clamp(31px, 5.4vw, 56px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--paper);
}

.page-about .about-lede {
  margin: 22px 0 0;
  max-width: 64ch;
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--steel);
}

.page-about .about-lede-2 {
  margin-top: 14px;
  font-size: 15.5px;
}

.page-about .about-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 20px;
  margin: 42px 0 0;
  padding: 26px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-meta-item dt {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--steel);
}

.page-about .about-meta-item dd {
  margin: 10px 0 0;
  font-size: clamp(24px, 3.4vw, 30px);
  line-height: 1;
  color: var(--cyan);
}

/* ---------- 通用章节头 ---------- */
.page-about .about-section {
  padding: 72px 0;
  border-top: 1px solid var(--line);
}

.page-about .sec-head {
  margin-bottom: 44px;
}

.page-about .sec-head .chapter-no {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(40px, 6.4vw, 74px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.05em;
  color: rgba(38, 242, 226, 0.24);
  margin-bottom: 12px;
}

.page-about .sec-head h2 {
  margin: 0;
  font-size: clamp(23px, 3.3vw, 37px);
  line-height: 1.22;
  letter-spacing: -0.015em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .sec-sub {
  margin: 14px 0 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--steel);
}

/* ---------- 01 发展节点 ---------- */
.page-about .journey-grid {
  display: grid;
  gap: 30px;
}

.page-about .journey-nodes {
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
  border-left: 1px solid var(--line);
  display: grid;
  gap: 2px;
}

.page-about .journey-nodes li {
  position: relative;
}

.page-about .journey-nodes a {
  display: block;
  padding: 10px 0;
  text-decoration: none;
  color: var(--steel);
  transition: color 0.26s var(--ease);
}

.page-about .journey-nodes a .mono {
  display: block;
  font-size: 17px;
  line-height: 1.1;
  letter-spacing: 0.02em;
}

.page-about .journey-nodes a em {
  display: block;
  margin-top: 4px;
  font-style: normal;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--steel);
  opacity: 0.78;
}

.page-about .journey-nodes a::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 19px;
  width: 9px;
  height: 9px;
  background: var(--ink-950);
  border: 1px solid var(--line-strong);
  transition: transform 0.28s var(--ease), background 0.28s var(--ease), border-color 0.28s var(--ease), box-shadow 0.28s var(--ease);
}

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

.page-about .journey-nodes a[aria-current="true"] em {
  color: var(--cyan);
  opacity: 0.9;
}

.page-about .journey-nodes a[aria-current="true"]::before {
  background: var(--cyan);
  border-color: var(--cyan);
  transform: scale(1.15);
  box-shadow: 0 0 0 4px rgba(38, 242, 226, 0.16);
}

.page-about .journey-stream {
  display: grid;
}

.page-about .journey-entry {
  padding: 28px 0 30px;
  border-top: 1px solid var(--line);
}

.page-about .journey-entry:first-child {
  padding-top: 4px;
  border-top: 0;
}

.page-about .journey-year {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .journey-entry h3 {
  margin: 0 0 10px;
  font-size: 20px;
  line-height: 1.35;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .journey-entry p {
  margin: 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--steel);
}

/* ---------- 02 覆盖范围 ---------- */
.page-about .coverage-banner {
  position: relative;
  margin: 0 0 36px;
  border: 1px solid var(--line);
  background: var(--ink-900);
  overflow: hidden;
}

.page-about .coverage-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  filter: saturate(0.6) contrast(1.08) brightness(0.84);
}

.page-about .coverage-banner figcaption {
  position: absolute;
  left: 0;
  bottom: 0;
  right: 0;
  padding: 12px 18px;
  background: rgba(10, 16, 48, 0.84);
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--steel);
}

.page-about .coverage-panel {
  padding: 0;
  border: 1px solid var(--line);
}

.page-about .coverage-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  color: var(--ink-deep);
}

.page-about .coverage-table caption {
  padding: 24px 26px 4px;
  text-align: left;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan-deep);
}

.page-about .coverage-table thead th {
  position: sticky;
  top: var(--header-h);
  z-index: 2;
  background: var(--paper);
  padding: 14px 26px;
  text-align: left;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--cyan-deep);
  border-bottom: 1px solid var(--about-rule-on-paper);
}

.page-about .coverage-table tbody td {
  padding: 18px 26px;
  vertical-align: top;
  line-height: 1.75;
  border-bottom: 1px solid var(--about-rule-on-paper);
}

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

.page-about .coverage-table tbody tr {
  transition: background 0.24s var(--ease);
}

.page-about .coverage-table tbody tr:hover {
  background: rgba(14, 143, 138, 0.07);
}

.page-about .coverage-table td:first-child {
  font-weight: 600;
  white-space: nowrap;
}

.page-about .coverage-table td:last-child {
  width: 1%;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 17px;
  color: var(--cyan-deep);
}

.page-about .coverage-tail {
  margin: 28px 0 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--steel);
}

/* ---------- 03 数据确认 ---------- */
.page-about .verify-grid {
  display: grid;
  gap: 30px;
}

.page-about .verify-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-900);
}

.page-about .verify-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.58) contrast(1.06) brightness(0.86);
}

.page-about .verify-figure figcaption {
  padding: 14px 18px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--steel);
}

.page-about .verify-panel {
  padding: 32px 28px;
  border: 1px solid var(--line);
}

.page-about .verify-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 26px;
}

.page-about .verify-steps li {
  display: flex;
  gap: 18px;
}

.page-about .verify-steps .mono {
  flex: 0 0 auto;
  font-size: 20px;
  line-height: 1.2;
  color: var(--cyan-deep);
}

.page-about .verify-steps h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-deep);
}

.page-about .verify-steps p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-body-on-paper);
}

/* ---------- 04 团队 ---------- */
.page-about .team-body {
  display: grid;
  gap: 30px;
}

.page-about .team-quadrants {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .team-cell {
  background: var(--ink-950);
  padding: 26px 24px 30px;
  transition: background 0.3s var(--ease);
}

.page-about .team-cell:hover {
  background: var(--ink-900);
}

.page-about .team-cell .cell-no {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .team-cell h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .team-cell p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--steel);
}

.page-about .team-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-900);
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  filter: saturate(0.58) contrast(1.06) brightness(0.86);
}

.page-about .team-figure figcaption {
  padding: 14px 18px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--steel);
}

.page-about .team-tail {
  margin: 34px 0 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--steel);
}

/* ---------- 05 合作生态 ---------- */
.page-about .eco-body {
  display: grid;
  gap: 36px;
}

.page-about .eco-svg {
  display: block;
  width: 100%;
  max-width: 480px;
  height: auto;
  margin: 0 auto;
}

.page-about .eco-ring circle {
  fill: none;
  stroke: var(--line-strong);
  stroke-width: 1;
  transition: stroke 0.3s var(--ease), stroke-width 0.3s var(--ease);
}

.page-about .eco-ring:hover circle {
  stroke: var(--cyan);
  stroke-width: 1.8;
}

.page-about .eco-ring-mid circle {
  stroke-dasharray: 5 7;
  stroke: var(--line);
}

.page-about .eco-ring-inner circle {
  stroke: rgba(255, 138, 33, 0.4);
}

.page-about .eco-ring-inner:hover circle {
  stroke: var(--orange);
}

.page-about .eco-core {
  fill: rgba(38, 242, 226, 0.1);
  stroke: var(--cyan);
  stroke-width: 1;
}

.page-about .eco-label {
  font-family: var(--font-sans);
  font-size: 16px;
  letter-spacing: 0.02em;
  fill: var(--steel);
}

.page-about .eco-label-core {
  fill: var(--cyan);
  font-size: 17px;
  font-weight: 700;
}

.page-about .eco-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 24px;
}

.page-about .eco-legend li {
  display: grid;
  grid-template-columns: 8px minmax(0, 1fr);
  gap: 0 16px;
}

.page-about .eco-legend .dot {
  width: 8px;
  height: 8px;
  margin-top: 8px;
  background: var(--cyan);
}

.page-about .eco-legend li:nth-child(2) .dot {
  background: var(--orange);
}

.page-about .eco-legend li:nth-child(3) .dot {
  background: var(--green);
}

.page-about .eco-legend li:nth-child(4) .dot {
  background: var(--magenta);
}

.page-about .eco-legend h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .eco-legend p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--steel);
}

.page-about .eco-tail {
  margin: 34px 0 0;
  max-width: 68ch;
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--steel);
}

/* ---------- 06 客户价值 ---------- */
.page-about .value-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .value-card {
  display: flex;
  flex-direction: column;
  padding: 30px 26px 32px;
  background: var(--ink-950);
  transition: background 0.3s var(--ease);
}

.page-about .value-card:hover {
  background: var(--ink-900);
}

.page-about .value-card h3 {
  margin: 0 0 12px;
  font-size: 17px;
  line-height: 1.45;
  font-weight: 700;
  color: var(--paper);
}

.page-about .value-card p {
  flex: 1;
  margin: 0 0 24px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .value-card .btn {
  align-self: flex-start;
}

.page-about .value-close {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px 28px;
  margin-top: 40px;
  padding: 28px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .value-close p {
  flex: 1 1 320px;
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--steel);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .team-quadrants {
    grid-template-columns: 1fr 1fr;
  }

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

@media (min-width: 768px) {
  .page-about .about-meta {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .value-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 900px) {
  .page-about .verify-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 42px;
    align-items: start;
  }

  .page-about .team-body {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .eco-body {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 48px;
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-about .about-section {
    padding: 88px 0;
  }

  .page-about .journey-grid {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 0 60px;
  }

  .page-about .journey-rail {
    position: sticky;
    top: calc(var(--header-h) + 30px);
    align-self: start;
  }

  .page-about .journey-year {
    display: none;
  }

  .page-about .journey-entry {
    padding: 30px 0 34px;
  }
}

@media (min-width: 1120px) {
  .page-about .value-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 767px) {
  .page-about .coverage-table,
  .page-about .coverage-table tbody,
  .page-about .coverage-table tr,
  .page-about .coverage-table td {
    display: block;
    width: auto;
  }

  .page-about .coverage-table caption {
    padding: 20px 20px 2px;
  }

  .page-about .coverage-table thead {
    display: none;
  }

  .page-about .coverage-table tbody tr {
    padding: 18px 20px;
    border-bottom: 1px solid var(--about-rule-on-paper);
  }

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

  .page-about .coverage-table tbody td {
    padding: 0;
    border: 0;
    white-space: normal;
  }

  .page-about .coverage-table td:first-child {
    font-size: 16px;
  }

  .page-about .coverage-table td[data-th]::before {
    content: attr(data-th);
    display: block;
    margin-bottom: 4px;
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--cyan-deep);
  }

  .page-about .coverage-table td + td {
    margin-top: 12px;
  }

  .page-about .coverage-table td:last-child {
    width: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}