.page-about {
  --about-sec-gap: clamp(52px, 7vw, 96px);
  padding-bottom: clamp(64px, 9vw, 140px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(36px, 5.5vw, 76px);
  padding-bottom: clamp(34px, 5vw, 62px);
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-hero .eyebrow {
  display: block;
  margin-bottom: 18px;
}

.page-about .about-title {
  margin: 0;
  font-size: clamp(38px, 8.6vw, 104px);
  line-height: 0.98;
  letter-spacing: -0.025em;
  font-weight: 900;
  color: var(--ink-blue);
}

.page-about .about-title em {
  position: relative;
  font-style: normal;
  color: var(--anchor-blue);
  white-space: nowrap;
}

.page-about .about-title em::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.05em;
  height: 0.08em;
  background: var(--electric-teal);
}

.page-about .about-lead {
  margin: clamp(22px, 3vw, 34px) 0 0;
  max-width: 60ch;
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.8;
  color: var(--gray-500);
}

.page-about .hero-facts {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .hero-fact {
  background: var(--paper);
  padding: 16px 16px 18px;
}

.page-about .hero-fact b {
  display: block;
  font-family: var(--mono);
  font-size: clamp(22px, 3.2vw, 30px);
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink-blue);
}

.page-about .hero-fact span {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--gray-500);
}

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

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding-top: clamp(36px, 5vw, 64px);
}

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

@media (min-width: 1160px) {
  .page-about .about-body {
    grid-template-columns: 188px minmax(0, 1fr);
    column-gap: clamp(26px, 3.4vw, 62px);
  }
}

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

.page-about .index-label {
  color: var(--gray-500);
}

.page-about .index-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .index-list a {
  display: block;
  padding: 8px 10px 8px 13px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--gray-500);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}

.page-about .index-list a:hover {
  color: var(--ink-blue);
  background: var(--gray-100);
}

.page-about .index-list a[aria-current="true"],
.page-about .index-list a[aria-current="location"] {
  color: var(--white);
  background: var(--anchor-blue);
  border-left-color: var(--electric-teal);
}

@media (min-width: 1160px) {
  .page-about .about-index {
    display: block;
    position: sticky;
    top: calc(var(--frame-h) + var(--status-h) + 28px);
    align-self: start;
    padding-top: 18px;
    border-top: 1px solid var(--line-strong);
  }
}

/* ---------- 章节通用 ---------- */
.page-about .sec {
  padding-top: var(--about-sec-gap);
  scroll-margin-top: calc(var(--frame-h) + var(--status-h) + 20px);
}

.page-about .sec:first-child {
  padding-top: 0;
}

.page-about .sec-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 16px;
  align-items: baseline;
  padding-top: 18px;
  border-top: 1px solid var(--line-strong);
}

.page-about .sec-num {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--signal-orange);
}

.page-about .sec-head h2 {
  margin: 0;
  color: var(--ink-blue);
}

.page-about .sec-note {
  grid-column: 2 / -1;
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
}

.page-about .sec-more {
  margin: clamp(24px, 3.2vw, 38px) 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-figure,
.page-about .quality-figure {
  margin: clamp(28px, 4vw, 46px) 0 0;
}

.page-about .quality-figure {
  max-width: 760px;
}

/* ---------- 业务版图 ---------- */
.page-about .scope-grid {
  margin-top: clamp(28px, 4vw, 44px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: 1px solid var(--line);
}

.page-about .scope-col {
  display: flex;
  gap: 16px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .col-en {
  flex: 0 0 auto;
  writing-mode: vertical-rl;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--gray-500);
  padding-top: 6px;
  user-select: none;
}

.page-about .col-main {
  flex: 1 1 auto;
  min-width: 0;
}

.page-about .scope-col h3 {
  margin: 0 0 10px;
  font-size: 20px;
  line-height: 1.4;
  color: var(--ink-blue);
}

.page-about .scope-col p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--gray-500);
  max-width: 44ch;
}

.page-about .scope-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .scope-list li {
  position: relative;
  padding-left: 15px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--gray-500);
}

.page-about .scope-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.64em;
  width: 5px;
  height: 1px;
  background: var(--teal-ink);
}

@media (min-width: 920px) {
  .page-about .scope-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .scope-col {
    border-bottom: 0;
    border-right: 1px solid var(--line);
    padding: 26px 24px 6px;
  }

  .page-about .scope-col:first-child {
    padding-left: 0;
  }

  .page-about .scope-col:last-child {
    border-right: 0;
    padding-right: 0;
  }

  .page-about .scope-col:nth-child(2) {
    margin-top: 34px;
  }

  .page-about .scope-col:nth-child(3) {
    margin-top: 68px;
  }
}

/* ---------- 发展历程 ---------- */
.page-about .tl-hint {
  display: block;
  margin: clamp(22px, 3vw, 32px) 0 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gray-500);
}

@media (min-width: 920px) {
  .page-about .tl-hint {
    display: none;
  }
}

.page-about .timeline-wrap {
  margin-top: clamp(14px, 2vw, 22px);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--gray-500) transparent;
  padding-bottom: 12px;
}

.page-about .timeline-wrap:focus-visible {
  outline: 2px solid var(--electric-teal);
  outline-offset: 4px;
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: stretch;
  min-width: max-content;
  border-top: 1px solid var(--line-strong);
}

.page-about .tl-item {
  position: relative;
  flex: 0 0 auto;
  width: min(78vw, 288px);
  padding: 30px 24px 26px 0;
  border-right: 1px solid var(--line);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 10px;
  height: 10px;
  transform: translate(0, -50%);
  background: var(--anchor-blue);
}

.page-about .tl-item--now::before {
  background: var(--signal-orange);
  box-shadow: 0 0 0 4px rgba(255, 74, 28, 0.14);
}

.page-about .tl-year {
  display: block;
  margin-bottom: 14px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--anchor-blue);
}

.page-about .tl-item--now .tl-year {
  color: var(--signal-orange);
}

.page-about .tl-item h3 {
  margin: 0 0 10px;
  font-size: 17px;
  line-height: 1.45;
  color: var(--graphite);
}

.page-about .tl-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--gray-500);
}

/* ---------- 团队与网络 ---------- */
.page-about .about-split {
  margin-top: clamp(28px, 4vw, 44px);
  gap: clamp(24px, 3.2vw, 48px);
  align-items: start;
}

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

.page-about .team-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .team-facts .stat {
  display: block;
  background: var(--paper);
  padding: 18px 16px 20px;
}

.page-about .team-facts .stat-value {
  display: block;
  font-size: clamp(24px, 2.6vw, 30px);
  letter-spacing: -0.02em;
  color: var(--ink-blue);
}

.page-about .team-facts .stat-label {
  display: block;
  margin-top: 7px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--gray-500);
}

.page-about .role-list {
  list-style: none;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .role-list li {
  display: grid;
  grid-template-columns: 5.5em minmax(0, 1fr);
  gap: 10px 18px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.75;
  color: var(--gray-500);
}

.page-about .role-list strong {
  color: var(--ink-blue);
  font-weight: 600;
}

/* ---------- 质量与资质 ---------- */
.page-about .flow-strip {
  margin-top: clamp(28px, 4vw, 44px);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  padding: 16px 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line);
}

.page-about .flow-step {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--ink-blue);
  padding: 7px 14px;
  border: 1px solid var(--line-strong);
  background: var(--white);
}

.page-about .flow-arrow {
  flex: 1 1 26px;
  min-width: 26px;
  height: 1px;
  margin: 8px 10px;
  background: var(--line-strong);
  position: relative;
}

.page-about .flow-arrow::after {
  content: "";
  position: absolute;
  right: 0;
  top: -3px;
  width: 7px;
  height: 7px;
  border-top: 1px solid var(--line-strong);
  border-right: 1px solid var(--line-strong);
  transform: rotate(45deg);
}

.page-about .table-scroll {
  margin-top: clamp(28px, 4vw, 44px);
  overflow-x: auto;
}

.page-about .quality-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  text-align: left;
  font-size: 14px;
}

.page-about .quality-table caption {
  text-align: left;
  padding-bottom: 12px;
  color: var(--gray-500);
}

.page-about .quality-table th,
.page-about .quality-table td {
  padding: 15px 16px 15px 0;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  line-height: 1.7;
}

.page-about .quality-table thead th {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--gray-500);
  border-bottom: 1px solid var(--line-strong);
}

.page-about .quality-table tbody th {
  width: 30%;
  font-weight: 600;
  color: var(--graphite);
}

.page-about .quality-table tbody td {
  color: var(--gray-500);
}

/* ---------- 合作生态 ---------- */
.page-about .partner-list {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .partner-list li {
  display: grid;
  grid-template-columns: 3.4em minmax(0, 1fr);
  gap: 6px 18px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .pl-no {
  padding-top: 4px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--signal-orange);
}

.page-about .pl-body {
  min-width: 0;
}

.page-about .pl-body h3 {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.45;
  color: var(--ink-blue);
}

.page-about .pl-body p {
  margin: 0;
  max-width: 70ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--gray-500);
}

/* ---------- 服务承诺 ---------- */
.page-about .service-grid {
  margin-top: clamp(28px, 4vw, 44px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: 1px solid var(--line-strong);
}

.page-about .service-col {
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .service-col h3 {
  margin: 0 0 14px;
  font-size: 18px;
  color: var(--ink-blue);
}

.page-about .service-col ul,
.page-about .service-col ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .service-col li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--gray-500);
}

.page-about .service-col ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  background: var(--anchor-blue);
}

.page-about .path-list li {
  padding-left: 30px;
}

.page-about .path-list li::before {
  content: counter(path, decimal-leading-zero);
  counter-increment: path;
  position: absolute;
  left: 0;
  top: 0.12em;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--teal-ink);
}

.page-about .path-list {
  counter-reset: path;
}

@media (min-width: 900px) {
  .page-about .service-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(26px, 4vw, 58px);
  }
}

.page-about .bar-row {
  margin-top: clamp(26px, 3.4vw, 40px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .bar-label {
  font-size: 15px;
  line-height: 1.6;
  color: var(--graphite);
}

.page-about .bar-track {
  display: block;
  height: 6px;
  background: var(--gray-100);
  overflow: hidden;
}

.page-about .bar-fill {
  display: block;
  height: 100%;
  width: 60%;
  background: linear-gradient(90deg, var(--anchor-blue), var(--electric-teal));
}

.page-about .bar-val {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ink-blue);
}

@media (min-width: 720px) {
  .page-about .bar-row {
    grid-template-columns: minmax(180px, 240px) minmax(0, 1fr) auto;
    align-items: center;
    gap: 22px;
  }
}

/* ---------- 动效退化 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .index-list a,
  .page-about .tl-item,
  .page-about .flow-step,
  .page-about .hero-fact {
    transition: none !important;
    animation: none !important;
  }
}