.page-about {
  --about-panel: rgba(20, 48, 74, 0.9);
  position: relative;
  display: block;
  background:
    radial-gradient(1100px 620px at 88% -8%, rgba(42, 30, 74, 0.5), transparent 62%),
    linear-gradient(180deg, var(--ink) 0%, #08131f 68%, var(--ink) 100%);
  color: var(--text);
  overflow-x: clip;
}

.page-about .breadcrumb {
  padding-top: 20px;
  font-size: 13px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: 26px 0 54px;
}

.page-about .about-hero-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

.page-about .about-hero-main h1 {
  margin: 16px 0 20px;
  font-family: var(--font-sans);
  font-size: clamp(31px, 7.4vw, 56px);
  font-weight: 800;
  line-height: 1.13;
  letter-spacing: -0.01em;
  color: #ffffff;
  position: relative;
  padding-left: 18px;
}

.page-about .about-hero-main h1::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 6px;
  width: 3px;
  background: linear-gradient(180deg, var(--gold), rgba(201, 162, 74, 0.15));
}

.page-about .about-hero-main .lede {
  max-width: 46em;
  margin: 0;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero-side {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding: 22px 20px;
  background: var(--glass);
  border: 1px solid var(--line-soft);
  border-top: 1px solid var(--line);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-glass);
}

.page-about .v-note {
  flex: none;
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--gold-deep);
}

.page-about .about-hero-stats {
  flex: 1;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 18px;
}

.page-about .about-hero-stats .stat-value {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(32px, 8vw, 44px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.05em;
  color: var(--gold);
}

.page-about .about-hero-stats .stat-label {
  display: block;
  margin-top: 7px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 40px 0 76px;
  }

  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.25fr) minmax(280px, 1fr);
    gap: 60px;
    align-items: end;
  }

  .page-about .about-hero-side {
    padding: 26px 24px;
  }
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  padding-top: 40px;
}

.page-about .about-tl-figure {
  margin: 30px 0 0;
}

.page-about .about-tl-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-lg);
  filter: saturate(0.9);
}

.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--line);
}

.page-about .about-tl-node {
  position: relative;
  padding: 22px 0 24px 18px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-tl-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gold-deep);
  box-shadow: 0 0 0 4px rgba(201, 162, 74, 0.14);
}

.page-about .about-tl-details {
  border: 0;
  background: none;
}

.page-about .about-tl-summary {
  position: relative;
  display: block;
  padding: 0 26px 0 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-tl-summary::after {
  content: "+";
  position: absolute;
  top: 4px;
  right: 0;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--sky);
}

.page-about .about-tl-details[open] .about-tl-summary::after {
  content: "–";
  color: var(--pearl);
}

.page-about .about-tl-year {
  display: block;
  font-family: var(--font-num);
  font-size: 36px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .about-tl-name {
  display: block;
  margin-top: 9px;
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-tl-panel {
  margin-top: 14px;
  padding-left: 13px;
  border-left: 2px solid rgba(201, 162, 74, 0.55);
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-tl-panel a {
  color: var(--sky);
}

@media (min-width: 780px) {
  .page-about .about-tl {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    border-top: 0;
  }

  .page-about .about-tl-node {
    padding: 30px 22px 8px 22px;
    border-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-tl-node:first-child {
    border-left: 0;
    padding-left: 0;
  }

  .page-about .about-tl-node:first-child::before {
    left: 0;
  }

  .page-about .about-tl-node::before {
    top: 30px;
    left: 0;
  }

  .page-about .about-tl-node:first-child .about-tl-node::before {
    left: 0;
  }

  .page-about .about-tl-year {
    font-size: 42px;
  }
}

/* ---------- 三条业务线 ---------- */

.page-about .about-lines-grid {
  display: grid;
  grid-template-columns: 1fr;
  margin-top: 32px;
}

.page-about .about-line-card {
  padding: 24px 22px 26px;
  background: var(--about-panel);
  border: 1px solid var(--line);
  border-radius: 0;
  transition: background var(--dur) ease, border-color var(--dur) ease, transform var(--dur) ease;
}

.page-about .about-line-card:first-child {
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.page-about .about-line-card:last-child {
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.page-about .about-line-card + .about-line-card {
  margin-top: -1px;
}

.page-about .about-line-index {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--gold-deep);
}

.page-about .about-line-title {
  margin: 0 0 12px;
  font-size: 21px;
  font-weight: 800;
  color: #ffffff;
}

.page-about .about-line-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-line-card .meta-row {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--gold-deep);
}

.page-about .about-line-card:hover,
.page-about .about-line-card:focus-within {
  background: var(--paper);
  border-color: var(--gold-deep);
  transform: translateY(-2px);
}

.page-about .about-line-card:hover .about-line-title,
.page-about .about-line-card:focus-within .about-line-title {
  color: var(--paper-ink);
}

.page-about .about-line-card:hover .about-line-text,
.page-about .about-line-card:focus-within .about-line-text {
  color: rgba(27, 37, 48, 0.78);
}

.page-about .about-line-card:hover .meta-row,
.page-about .about-line-card:focus-within .meta-row {
  color: rgba(27, 37, 48, 0.62);
  border-top-color: rgba(27, 37, 48, 0.22);
}

.page-about .about-line-card:hover .about-line-index,
.page-about .about-line-card:focus-within .about-line-index {
  color: #8a6d24;
}

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

  .page-about .about-line-card {
    padding: 28px 26px 30px;
  }

  .page-about .about-line-card:first-child {
    border-radius: var(--radius-lg) 0 0 var(--radius-lg);
  }

  .page-about .about-line-card:last-child {
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  }

  .page-about .about-line-card + .about-line-card {
    margin-top: 0;
    border-left: 0;
  }
}

/* ---------- 更新链路 ---------- */

.page-about .about-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 46px;
}

.page-about .about-flow-title {
  margin: 0;
  font-size: 20px;
  font-weight: 800;
  color: #ffffff;
}

.page-about .about-flow-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
}

.page-about .about-flow-list li {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 4px 12px;
  padding: 15px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-flow-list li:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .flow-step {
  grid-row: span 2;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--gold-deep);
}

.page-about .flow-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.page-about .flow-desc {
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

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

.page-about .about-flow-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

@media (min-width: 900px) {
  .page-about .about-flow {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 52px;
    align-items: start;
  }
}

/* ---------- 团队与伙伴 ---------- */

.page-about .about-team-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-team-main p {
  max-width: 40em;
  margin: 0 0 16px;
}

.page-about .about-team-lead {
  font-size: 17px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-team-main a {
  color: var(--sky);
}

.page-about .about-team-side {
  display: grid;
  gap: 22px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.page-about .about-team-side .stat-value {
  display: block;
  font-family: var(--font-num);
  font-size: 40px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.05em;
  color: var(--gold);
}

.page-about .about-team-side .stat-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--muted);
}

@media (min-width: 880px) {
  .page-about .about-team-inner {
    grid-template-columns: minmax(0, 1.3fr) minmax(230px, 0.7fr);
    gap: 60px;
  }

  .page-about .about-team-side {
    padding-top: 0;
    padding-left: 26px;
    border-top: 0;
    border-left: 1px solid var(--line);
    align-content: start;
  }
}

/* ---------- 服务标准 ---------- */

.page-about .about-std-list {
  margin: 32px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-std-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-std-term {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .about-std-desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-std-sample {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-left: 12px;
  padding: 3px 6px 3px 10px;
  border: 1px dashed var(--line);
  border-radius: 999px;
  vertical-align: middle;
}

.page-about .about-std-sample .copy-value {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--pearl);
}

.page-about .about-std-sample .copy-btn {
  font-size: 12px;
  color: var(--sky);
  background: none;
  border: 0;
  cursor: pointer;
}

.page-about .about-std-sample .copy-btn:hover {
  color: var(--pearl);
}

@media (min-width: 760px) {
  .page-about .about-std-item {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 26px;
    align-items: baseline;
    padding: 24px 0;
  }
}

/* ---------- 覆盖分布 ---------- */

.page-about .about-coverage-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

.page-about .about-coverage-text p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-coverage-stats {
  list-style: none;
  margin: 26px 0 0;
  padding: 22px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  border-top: 1px solid var(--line);
}

.page-about .about-coverage-stats .stat-value {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(30px, 8vw, 42px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--gold);
}

.page-about .about-coverage-stats .stat-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--muted);
}

.page-about .cover-pulses {
  display: flex;
  flex-wrap: wrap;
  gap: 11px;
  margin-top: 26px;
}

.page-about .cover-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: rgba(201, 162, 74, 0.26);
  transition: background 420ms ease, box-shadow 420ms ease, transform 420ms ease;
}

.page-about .cover-dot.is-in {
  background: var(--gold);
  box-shadow: 0 0 10px 2px rgba(242, 199, 92, 0.48);
  transform: translateY(-2px);
}

.page-about .cover-dot:nth-child(1) { transition-delay: 0ms; }
.page-about .cover-dot:nth-child(2) { transition-delay: 70ms; }
.page-about .cover-dot:nth-child(3) { transition-delay: 140ms; }
.page-about .cover-dot:nth-child(4) { transition-delay: 210ms; }
.page-about .cover-dot:nth-child(5) { transition-delay: 280ms; }
.page-about .cover-dot:nth-child(6) { transition-delay: 350ms; }
.page-about .cover-dot:nth-child(7) { transition-delay: 420ms; }
.page-about .cover-dot:nth-child(8) { transition-delay: 490ms; }
.page-about .cover-dot:nth-child(9) { transition-delay: 560ms; }
.page-about .cover-dot:nth-child(10) { transition-delay: 630ms; }

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

.page-about .about-coverage-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

@media (min-width: 900px) {
  .page-about .about-coverage-inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 56px;
    align-items: center;
  }
}

/* ---------- 结尾入口 ---------- */

.page-about .about-next {
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(42, 30, 74, 0.24), transparent 70%);
}

.page-about .about-next-title {
  margin: 0 0 14px;
  font-size: clamp(24px, 5vw, 32px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: #ffffff;
}

.page-about .about-next-text {
  max-width: 52em;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-next-links {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-next-links a {
  display: inline-block;
  padding: 10px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 14px;
  color: var(--sky);
  text-decoration: none;
  transition: background var(--dur) ease, border-color var(--dur) ease, color var(--dur) ease;
}

.page-about .about-next-links a:hover,
.page-about .about-next-links a:focus-visible {
  background: var(--teal-deep);
  border-color: var(--pearl);
  color: var(--pearl);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-line-card,
  .page-about .cover-dot,
  .page-about .about-next-links a {
    transition: none;
  }
}