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

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
}

.page-about h1 {
  font-size: clamp(1.9rem, 4vw, 3.2rem);
  line-height: 1.08;
  margin: 1rem 0 0;
  color: var(--ivory);
}

.page-about h2 {
  font-size: clamp(1.5rem, 3vw, 2.4rem);
  line-height: 1.15;
  margin: 0;
}

.page-about h3 {
  font-size: 1.05rem;
  letter-spacing: .01em;
  line-height: 1.4;
}

.page-about .container-wide {
  position: relative;
}

.page-about .about-kicker {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--gray);
  margin: 0 0 .4rem;
}

/* ===== 01 Hero ===== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 1.25rem 0 3rem;
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-soft) 58%, var(--ink) 100%);
  color: var(--ivory);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--orange) 0%, var(--orange) 7%, var(--green) 7%, var(--green) 14%, transparent 14%);
}

.page-about .about-hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: .5;
  pointer-events: none;
}

.page-about .about-hero-svg {
  width: 100%;
  height: 100%;
}

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

.page-about .about-hero .breadcrumb {
  margin-bottom: 2.5rem;
}

.page-about .about-hero .breadcrumb a {
  color: rgba(245, 241, 232, .65);
}

.page-about .about-hero .breadcrumb a:hover {
  color: var(--orange);
}

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

.page-about .about-hero-grid {
  display: grid;
  gap: 2rem;
}

.page-about .about-hero-copy {
  max-width: 34rem;
}

.page-about .about-hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--green);
  border: 1px solid rgba(0, 168, 107, .4);
  padding: .35rem .75rem;
  border-radius: 999px;
  background: rgba(0, 168, 107, .08);
  margin-bottom: 1.25rem;
}

.page-about .about-hero-kicker-num {
  color: var(--orange);
}

.page-about .about-hero-lead {
  font-size: 1.25rem;
  line-height: 1.7;
  color: #fff;
  margin: 1.5rem 0 .75rem;
  font-weight: 500;
}

.page-about .about-hero-desc {
  color: rgba(245, 241, 232, .78);
  line-height: 1.7;
  margin-bottom: 1.75rem;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .8rem;
  margin: 1.5rem 0 2rem;
}

.page-about .about-hero-geo {
  display: flex;
  align-items: center;
  gap: .75rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .08em;
  color: rgba(245, 241, 232, .6);
  border-top: 1px solid rgba(245, 241, 232, .15);
  padding-top: 1rem;
}

.page-about .about-geo-coord {
  color: var(--orange);
}

.page-about .about-hero-visual {
  display: grid;
  gap: 1rem;
}

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

.page-about .about-hero-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border-radius: var(--radius-lg);
  display: block;
  box-shadow: 0 18px 50px rgba(0, 0, 0, .35);
}

.page-about .about-hero-figure figcaption {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: .75rem 0 0;
  font-family: var(--font-mono);
  font-size: .75rem;
  color: rgba(245, 241, 232, .65);
  letter-spacing: .06em;
}

.page-about .about-hero-caption-sep {
  color: var(--gray);
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.page-about .about-hstat {
  background: rgba(255, 255, 255, .06);
  border: 1px solid rgba(255, 255, 255, .1);
  border-radius: var(--radius-lg);
  padding: .9rem .8rem;
  text-align: center;
}

.page-about .about-hstat-num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  color: var(--ivory);
  line-height: 1.1;
}

.page-about .about-hstat-num span {
  color: var(--orange);
  font-size: .75em;
}

.page-about .about-hstat-label {
  display: block;
  margin-top: .3rem;
  font-size: .7rem;
  color: rgba(245, 241, 232, .6);
  letter-spacing: .04em;
}

/* ===== 02 Milestones ===== */
.page-about .about-milestones {
  padding: 5rem 0;
}

.page-about .about-milestone-layout {
  display: grid;
  gap: 2rem;
  margin-top: 2.5rem;
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 1.4rem;
  border-left: 2px solid rgba(11, 31, 58, .14);
  display: grid;
  gap: .9rem;
}

.page-about .about-tl-item {
  position: relative;
  background: #fff;
  border: 1px solid rgba(11, 31, 58, .08);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-tl-item:hover {
  border-color: rgba(255, 92, 0, .5);
  transform: translateX(3px);
}

.page-about .about-tl-item summary {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .6rem 1rem;
  padding: 1rem 1.1rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-tl-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--navy);
  color: var(--ivory);
  font-family: var(--font-mono);
  font-size: .8rem;
  flex: none;
}

.page-about .about-tl-meta {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--gray);
  background: var(--moss);
  padding: .25rem .5rem;
  border-radius: 999px;
}

.page-about .about-tl-heading {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--navy);
  font-size: 1rem;
  transition: color .2s var(--ease);
}

.page-about .about-tl-item:hover .about-tl-heading {
  color: var(--orange);
}

.page-about .about-tl-content {
  padding: 0 1.1rem 1.1rem;
  border-top: 1px dashed rgba(11, 31, 58, .12);
  margin-top: .4rem;
}

.page-about .about-tl-content p {
  font-size: .9rem;
  line-height: 1.7;
  color: rgba(10, 20, 32, .75);
  margin: .8rem 0 .6rem;
}

.page-about .about-tl-tags {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
}

.page-about .about-milestone-aside {
  display: grid;
  gap: 1rem;
  align-content: start;
}

.page-about .about-aside-card {
  background: var(--navy);
  color: var(--ivory);
  border-radius: var(--radius-lg);
  padding: 1.4rem;
}

.page-about .about-aside-card-green {
  background: var(--green);
  color: #fff;
}

.page-about .about-aside-num {
  display: block;
  font-family: var(--font-display);
  font-size: 2.6rem;
  line-height: 1.1;
}

.page-about .about-aside-card p {
  margin: .5rem 0 .8rem;
  color: rgba(255, 255, 255, .85);
  line-height: 1.5;
}

.page-about .about-aside-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .7rem;
  color: rgba(255, 255, 255, .6);
  line-height: 1.5;
}

.page-about .about-milestone-quote {
  margin: 1rem 0 0;
  padding: 1.4rem 1.2rem;
  background: var(--moss);
  border-radius: var(--radius-lg);
}

.page-about .about-milestone-quote p {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--navy);
  margin: 0 0 .4rem;
}

.page-about .about-milestone-quote cite {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: .7rem;
  color: var(--gray);
}

/* ===== 03 Team ===== */
.page-about .about-team {
  background: #ffffff;
  padding: 5rem 0;
}

.page-about .about-team-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
  margin-top: 2.5rem;
}

.page-about .about-team-card {
  background: var(--ivory);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  border: 1px solid rgba(11, 31, 58, .08);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .about-team-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(11, 31, 58, .1);
}

.page-about .about-team-card-wide {
  background: var(--navy);
  color: var(--ivory);
}

.page-about .about-team-card-wide:hover {
  box-shadow: 0 14px 32px rgba(11, 31, 58, .28);
}

.page-about .about-team-card-wide p {
  color: rgba(245, 241, 232, .8);
}

.page-about .about-team-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .8rem;
  color: var(--orange);
  margin-bottom: .8rem;
}

.page-about .about-team-card h3 {
  margin: 0 0 .6rem;
  color: inherit;
}

.page-about .about-team-card p {
  margin: 0 0 .8rem;
  line-height: 1.7;
  font-size: .9rem;
  color: rgba(10, 20, 32, .75);
}

.page-about .about-team-meta {
  display: block;
  font-family: var(--font-mono);
  font-size: .7rem;
  color: var(--gray);
  line-height: 1.5;
}

.page-about .about-process {
  margin-top: 2.5rem;
  background: var(--moss);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.2rem;
}

.page-about .about-process-title {
  flex: 1 1 100%;
  display: flex;
  align-items: center;
  gap: .8rem;
}

.page-about .about-process-num {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--green);
}

.page-about .about-process h3 {
  margin: 0;
  color: var(--navy);
}

.page-about .about-process-steps {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  margin: 0;
  padding: 0;
}

.page-about .about-process-steps li {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: .8rem;
  font-weight: 600;
  color: var(--navy);
  background: #fff;
  padding: .6rem .8rem;
  border-radius: 999px;
}

.page-about .about-step-index {
  font-family: var(--font-mono);
  color: var(--orange);
}

.page-about .about-process-note {
  flex: 1 1 100%;
  font-family: var(--font-mono);
  font-size: .74rem;
  color: var(--gray);
  margin: 0;
}

/* ===== 04 Tech ===== */
.page-about .about-tech {
  padding: 5rem 0;
  background: var(--moss);
}

.page-about .about-tech-layout {
  display: grid;
  gap: 2rem;
  margin-top: 2.5rem;
}

.page-about .about-tech-visual figure {
  margin: 0;
}

.page-about .about-tech-visual img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-lg);
  display: block;
  box-shadow: 0 16px 40px rgba(11, 31, 58, .15);
}

.page-about .about-tech-visual figcaption {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--navy);
  padding-top: .6rem;
}

.page-about .about-tech-data {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.page-about .about-tech-metric {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 1.25rem 1rem;
  border: 1px solid rgba(11, 31, 58, .06);
  transition: transform .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-tech-metric:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 92, 0, .4);
}

.page-about .about-tech-value {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  color: var(--navy);
  line-height: 1.1;
}

.page-about .about-tech-unit {
  color: var(--orange);
  font-size: .7em;
  margin-left: .1rem;
}

.page-about .about-tech-metric p {
  margin: .4rem 0 0;
  font-size: .8rem;
  color: var(--gray);
  line-height: 1.5;
}

.page-about .about-tech-compliance {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
  margin-top: 2.5rem;
}

.page-about .about-comp-card {
  background: var(--navy);
  border-radius: var(--radius-lg);
  padding: 1.4rem;
  color: var(--ivory);
  transition: transform .2s var(--ease), background .2s var(--ease);
}

.page-about .about-comp-card:hover {
  transform: translateY(-3px);
  background: var(--navy-soft);
}

.page-about .about-comp-card h3 {
  color: var(--green);
  margin: 0 0 .5rem;
  font-size: 1rem;
}

.page-about .about-comp-card p {
  color: rgba(245, 241, 232, .75);
  font-size: .88rem;
  line-height: 1.6;
  margin: 0;
}

/* ===== 05 Coverage ===== */
.page-about .about-coverage {
  padding: 5rem 0;
  background: #ffffff;
}

.page-about .about-coverage-layout {
  display: grid;
  gap: 2.5rem;
  margin-top: 2.5rem;
}

.page-about .about-coverage-lead {
  font-size: 1.1rem;
  color: var(--navy);
  line-height: 1.7;
  max-width: 36rem;
  margin: 0 0 1.5rem;
}

.page-about .about-coverage-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 1.5rem 0;
}

.page-about .about-coverage-list div {
  background: var(--moss);
  border-radius: var(--radius-lg);
  padding: 1rem;
  transition: transform .2s var(--ease), background .2s var(--ease);
}

.page-about .about-coverage-list div:hover {
  background: var(--navy);
  transform: translateY(-2px);
}

.page-about .about-coverage-list dt {
  font-size: .72rem;
  color: var(--gray);
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-bottom: .4rem;
}

.page-about .about-coverage-list div:hover dt {
  color: rgba(245, 241, 232, .6);
}

.page-about .about-coverage-list dd {
  margin: 0;
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--navy);
}

.page-about .about-coverage-list div:hover dd {
  color: var(--ivory);
}

.page-about .about-coverage-note {
  background: var(--ivory);
  border-left: 4px solid var(--orange);
  padding: 1rem 1.2rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.page-about .about-coverage-note p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.7;
  color: rgba(10, 20, 32, .75);
}

.page-about .about-coverage-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.5rem;
}

.page-about .about-coverage-visual {
  display: grid;
  gap: 1.25rem;
}

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

.page-about .about-coverage-visual img {
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--radius-lg);
  display: block;
  box-shadow: 0 12px 36px rgba(11, 31, 58, .15);
}

.page-about .about-coverage-visual figcaption {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--gray);
  padding-top: .6rem;
  text-align: center;
}

.page-about .about-coverage-legend {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .6rem;
}

.page-about .about-cov-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .5rem;
  background: var(--ivory);
  border: 1px solid rgba(11, 31, 58, .08);
  border-radius: 999px;
  padding: .6rem .8rem;
  transition: background .2s var(--ease), color .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-cov-item:hover {
  background: var(--navy);
  color: var(--ivory);
  transform: translateY(-2px);
}

.page-about .about-cov-dot {
  width: .6rem;
  height: .6rem;
  border-radius: 50%;
  background: var(--gray);
  flex: none;
  transition: background .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .about-cov-item[data-state="live"] .about-cov-dot {
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(0, 168, 107, .2);
}

.page-about .about-cov-item:hover .about-cov-dot {
  background: var(--orange);
  box-shadow: 0 0 0 3px rgba(255, 92, 0, .2);
}

.page-about .about-cov-item span {
  font-size: .82rem;
  font-weight: 600;
}

.page-about .about-cov-item em {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: .68rem;
  color: var(--gray);
}

.page-about .about-cov-item:hover em {
  color: var(--orange);
}

/* ===== 响应式 ===== */
@media (min-width: 640px) {
  .page-about .about-team-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-team-card-wide {
    grid-column: span 2;
  }

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

@media (min-width: 860px) {
  .page-about .about-hero-grid {
    grid-template-columns: 1.05fr .95fr;
    align-items: center;
  }

  .page-about .about-tech-layout {
    grid-template-columns: 1.1fr .9fr;
    align-items: center;
  }

  .page-about .about-coverage-layout {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-about .about-milestone-layout {
    grid-template-columns: minmax(0, 1fr) 300px;
  }

  .page-about .about-process-title {
    flex: 1 1 auto;
  }

  .page-about .about-process-steps {
    flex: 1 1 auto;
    justify-content: flex-end;
  }

  .page-about .about-process-note {
    flex: 1 1 100%;
  }
}