.page-about {
  background: var(--paper);
  color: var(--ink);
}

.page-about a:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

.page-about .figure-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ========== 首屏 ========== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--navy);
  color: var(--paper);
  padding-block: clamp(22px, 4vw, 40px) clamp(44px, 8vw, 92px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 42%;
  right: -18%;
  bottom: -58%;
  height: 92%;
  background: radial-gradient(closest-side, rgba(143, 220, 216, 0.18), rgba(143, 220, 216, 0));
  pointer-events: none;
}

.page-about .about-hero-shell {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 5vw, 44px);
  align-items: center;
}

.page-about .about-hero .crumbs-list,
.page-about .about-hero .crumbs-list a {
  color: rgba(247, 249, 252, 0.7);
}

.page-about .about-hero .crumbs-list a:hover {
  color: #ffffff;
}

.page-about .about-hero .crumbs-list [aria-current="page"] {
  color: var(--cyan);
}

.page-about .about-hero .eyebrow {
  margin: clamp(16px, 3vw, 26px) 0 0;
  color: var(--cyan);
  font-size: 11px;
  letter-spacing: 0.18em;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  max-width: 17ch;
  color: #ffffff;
}

.page-about .about-hero .lede {
  margin: 20px 0 0;
  max-width: 50ch;
  color: rgba(247, 249, 252, 0.8);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(22px, 4vw, 34px);
}

.page-about .about-hero-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 16px clamp(14px, 3vw, 30px);
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 18px 0 0;
  border-top: 1px solid rgba(221, 227, 234, 0.2);
}

.page-about .about-hero-facts dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-hero-facts dd {
  margin: 6px 0 0;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--paper);
}

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

.page-about .about-hero-figure .figure-frame {
  border: 1px solid rgba(143, 220, 216, 0.3);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 91%);
}

.page-about .about-hero-figure .figure-cap {
  margin-top: 10px;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: rgba(247, 249, 252, 0.6);
}

/* ========== 档案区骨架 ========== */
.page-about .about-archive {
  padding-block: clamp(40px, 7vw, 84px);
}

.page-about .about-archive-shell {
  display: grid;
  gap: clamp(28px, 5vw, 40px);
}

.page-about .about-index {
  border-top: 2px solid var(--navy);
  padding-top: 16px;
}

.page-about .about-index-caption {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gray);
}

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

.page-about .about-index-list a {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 9px 10px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 0.92rem;
  color: var(--navy);
  text-decoration: none;
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-index-list a:hover,
.page-about .about-index-list a:focus-visible {
  background: #ffffff;
  border-color: var(--line);
}

.page-about .about-index-list .mono {
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--gray);
}

.page-about .about-flow {
  display: grid;
  gap: clamp(44px, 7vw, 76px);
}

.page-about .about-block {
  scroll-margin-top: 100px;
}

.page-about .about-block-head {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(18px, 3vw, 26px);
}

.page-about .about-block-head .section-title {
  margin: 0;
  color: var(--navy);
}

.page-about .about-step {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--navy);
}

.page-about .about-step::before {
  content: "";
  width: 14px;
  height: 3px;
  background: var(--orange);
}

.page-about .about-block-lede {
  margin: 0;
  max-width: 64ch;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--gray);
}

.page-about .about-block-lede a {
  color: var(--navy);
  text-decoration: none;
  border-bottom: 1px solid var(--orange-soft);
}

.page-about .about-block .prose {
  max-width: 68ch;
}

.page-about .about-block .prose p {
  margin: 0 0 1em;
  line-height: 1.85;
}

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

/* ========== 当前定位条 ========== */
.page-about .about-position {
  list-style: none;
  margin: clamp(20px, 3vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.page-about .about-position li {
  display: grid;
  gap: 6px;
  background: #ffffff;
  padding: 14px 16px;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--navy);
}

.page-about .about-position .mono {
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--gray);
}

/* ========== 版本时间线 ========== */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  display: grid;
  gap: 16px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--line);
}

.page-about .about-version {
  position: relative;
  padding: clamp(16px, 2.4vw, 24px);
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-version::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 24px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--paper);
  border: 1px solid var(--navy);
}

.page-about .about-version--current {
  border-color: var(--navy-2);
}

.page-about .about-version--current::before {
  background: var(--orange);
  border-color: var(--orange);
}

.page-about .about-vnum {
  display: inline-block;
  padding: 3px 8px;
  border-radius: var(--radius);
  background: var(--navy);
  color: var(--paper);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.page-about .about-version--current .about-vnum {
  background: var(--orange-soft);
  color: var(--navy);
}

.page-about .about-version h3 {
  margin: 12px 0 8px;
  font-size: clamp(1.02rem, 2vw, 1.22rem);
  font-weight: 700;
  line-height: 1.35;
  color: var(--navy);
}

.page-about .about-version p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-version-points {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-version-points li {
  padding: 4px 9px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  font-size: 0.8rem;
  color: var(--navy-2);
}

@media (hover: hover) {
  .page-about .about-version:hover {
    transform: translateY(-2px);
    border-color: var(--navy-2);
  }
}

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

.page-about .about-version-figure .figure-frame {
  border: 1px solid var(--line);
  background: #ffffff;
}

.page-about .about-version-figure .figure-cap {
  margin-top: 10px;
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--gray);
}

/* ========== 维护流程 ========== */
.page-about .about-flow-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

@media (min-width: 760px) {
  .page-about .about-flow-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-flow-step {
  position: relative;
  background: #ffffff;
  padding: clamp(16px, 2.4vw, 22px);
}

.page-about .about-flow-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 28px;
  height: 2px;
  background: var(--cyan);
}

.page-about .about-flow-num {
  display: inline-block;
  padding: 2px 6px;
  border-radius: var(--radius);
  background: var(--cyan);
  color: var(--navy);
  font-size: 10px;
  letter-spacing: 0.12em;
}

.page-about .about-flow-step h3 {
  margin: 12px 0 8px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
}

.page-about .about-flow-step p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--ink);
}

/* ========== 团队与覆盖 ========== */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

@media (min-width: 780px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-metric {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px;
  padding: clamp(16px, 2.4vw, 24px);
  background: var(--paper);
}

.page-about .about-metric--ink {
  background: var(--navy);
}

.page-about .about-metric-num {
  font-size: clamp(1.75rem, 4.2vw, 2.6rem);
  font-weight: 250;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--navy);
  font-variant-numeric: tabular-nums;
}

.page-about .about-metric-unit {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gray);
}

.page-about .about-metric-label {
  flex-basis: 100%;
  margin: 8px 0 0;
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--gray);
}

.page-about .about-metric--ink .about-metric-num {
  color: var(--paper);
}

.page-about .about-metric--ink .about-metric-unit,
.page-about .about-metric--ink .about-metric-label {
  color: rgba(247, 249, 252, 0.72);
}

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

.page-about .about-regions li {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 11px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 0.84rem;
  color: var(--navy-2);
}

.page-about .about-regions .mono {
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--navy);
}

.page-about .about-note {
  margin: 18px 0 0;
  max-width: 68ch;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--gray);
}

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

.page-about .about-team-figure .figure-frame {
  border: 1px solid var(--line);
  background: #ffffff;
}

.page-about .about-team-figure .figure-cap {
  margin-top: 10px;
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--gray);
}

/* ========== 服务与协作 ========== */
.page-about .about-service-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

@media (min-width: 860px) {
  .page-about .about-service-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-service-card {
  padding: clamp(18px, 2.8vw, 28px);
  background: #ffffff;
}

.page-about .about-service-card--ink {
  background: var(--navy-2);
  color: rgba(247, 249, 252, 0.82);
}

.page-about .about-service-card h3 {
  margin: 0 0 14px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--navy);
}

.page-about .about-service-card--ink h3 {
  color: #ffffff;
}

.page-about .about-channels {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-channels li {
  display: grid;
  gap: 3px;
  font-size: 0.92rem;
  color: var(--navy);
  font-weight: 600;
  word-break: break-word;
}

.page-about .about-channels .mono {
  font-size: 10px;
  letter-spacing: 0.1em;
  font-weight: 400;
  color: var(--gray);
}

.page-about .about-service-note {
  margin: 16px 0 18px;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--gray);
}

.page-about .about-service-card--ink p {
  margin: 0 0 14px;
  font-size: 0.92rem;
  line-height: 1.85;
}

.page-about .about-service-card--ink .btn {
  margin-top: 4px;
}

/* ========== 质量报告 ========== */
.page-about .about-quality-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-quality-list li {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  background: #ffffff;
  border-left: 2px solid var(--cyan);
}

.page-about .about-quality-list .mono {
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--navy);
}

.page-about .about-quality-list p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--ink);
}

/* ========== 尾段行动区 ========== */
.page-about .about-cta {
  background: var(--navy);
  color: var(--paper);
  padding-block: clamp(36px, 6vw, 64px);
}

.page-about .about-cta-shell {
  display: grid;
  gap: 16px;
}

.page-about .about-cta h2 {
  margin: 0;
  font-size: clamp(1.5rem, 3.2vw, 2.1rem);
  font-weight: 700;
  line-height: 1.2;
  color: #ffffff;
}

.page-about .about-cta p {
  margin: 0;
  max-width: 62ch;
  line-height: 1.85;
  color: rgba(247, 249, 252, 0.78);
}

.page-about .about-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 6px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-version,
  .page-about .about-index-list a {
    transition: none;
  }

  .page-about .about-version:hover {
    transform: none;
  }
}

@media (min-width: 620px) {
  .page-about .about-index-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-hero-shell {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 5vw, 64px);
  }
}

@media (min-width: 1000px) {
  .page-about .about-archive-shell {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 96px;
  }

  .page-about .about-index-list {
    grid-template-columns: minmax(0, 1fr);
  }
}