.page-about {
  --about-line: rgba(242, 183, 5, 0.22);
  --about-line-strong: rgba(242, 183, 5, 0.72);
  --about-panel: rgba(29, 53, 87, 0.78);
  --about-panel-border: rgba(212, 175, 55, 0.18);
  position: relative;
  overflow: hidden;
  color: var(--ivory);
}
.page-about::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 8% 10%, rgba(242, 183, 5, 0.07), transparent 44%),
    radial-gradient(ellipse at 92% 72%, rgba(212, 175, 55, 0.05), transparent 48%);
  pointer-events: none;
  z-index: 0;
}
.page-about > * {
  position: relative;
  z-index: 1;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 32px 20px 0;
}
.page-about .breadcrumb__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: '·';
  margin-right: var(--space-2);
  color: var(--gold-metal);
}
.page-about .breadcrumb__link {
  color: var(--ice-blue);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.2s ease;
}
.page-about .breadcrumb__link:hover {
  color: var(--gold);
}
.page-about .breadcrumb__current {
  color: var(--light-gold);
  font-size: 14px;
  font-weight: 600;
}

/* ---------- 首屏目录封面 ---------- */
.page-about .about-cover {
  padding: 48px 0 var(--space-7);
}
.page-about .about-cover__grid {
  display: grid;
  gap: var(--space-6);
}
.page-about .about-cover__text {
  position: relative;
}
.page-about .about-cover__text .section-kicker {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--gold);
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.page-about .about-cover__lead {
  margin: var(--space-4) 0 0;
  color: var(--ice-blue);
  font-size: 16px;
  line-height: 1.75;
  max-width: 46em;
}
.page-about .about-cover__actions {
  margin-top: var(--space-5);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}
.page-about .about-cover__aside {
  display: grid;
  gap: var(--space-4);
}
.page-about .about-cover__card {
  position: relative;
  padding: var(--space-5);
  border: 1px solid var(--about-panel-border);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(29, 53, 87, 0.88), rgba(10, 22, 48, 0.72));
  box-shadow: var(--shadow-panel);
}
.page-about .about-cover__card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 48px;
  height: 3px;
  background: linear-gradient(90deg, var(--gold), var(--gold-metal));
  border-radius: 0 0 4px 0;
}
.page-about .about-cover__card h2 {
  margin: 0 0 var(--space-4);
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: 0.03em;
  color: var(--gold);
}
.page-about .about-cover__card dl {
  margin: 0;
  display: grid;
  gap: 10px;
}
.page-about .about-cover__card dl div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-3);
  padding-bottom: 8px;
  border-bottom: 1px dashed rgba(242, 183, 5, 0.14);
}
.page-about .about-cover__card dl div:last-child {
  border-bottom: none;
}
.page-about .about-cover__card dt {
  color: var(--ice-blue);
  font-size: 14px;
}
.page-about .about-cover__card dd {
  margin: 0;
  color: var(--light-gold);
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
}
.page-about .about-cover__card--notice p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ice-blue);
}

/* ---------- 平台定位 ---------- */
.page-about .about-position {
  padding: var(--space-6) 0;
  background: linear-gradient(180deg, rgba(10, 22, 48, 0.25), transparent);
}
.page-about .about-position .section-head {
  margin-bottom: var(--space-5);
}
.page-about .about-position__layout {
  display: grid;
  gap: var(--space-6);
}
.page-about .about-position__body p {
  margin: 0 0 var(--space-4);
  font-size: 16px;
  line-height: 1.8;
  color: var(--ice-blue);
}
.page-about .about-position__body p:first-child {
  font-size: 18px;
  color: var(--ivory);
  line-height: 1.85;
}
.page-about .about-position__figure {
  margin: 0;
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--about-panel-border);
}
.page-about .about-position__figure img {
  display: block;
  width: 100%;
  height: auto;
}
.page-about .about-position__figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--space-3) var(--space-4);
  background: linear-gradient(transparent, rgba(10, 22, 48, 0.85));
  color: var(--light-gold);
  font-size: 14px;
  text-align: right;
  letter-spacing: 0.03em;
}

/* ---------- 发展历程 ---------- */
.page-about .about-journey {
  padding: var(--space-7) 0;
}
.page-about .about-journey .section-head {
  max-width: 760px;
  margin-bottom: var(--space-6);
}
.page-about .about-journey__layout {
  display: grid;
  gap: var(--space-6);
}
.page-about .about-journey__archive {
  display: grid;
  gap: var(--space-4);
  align-content: start;
}
.page-about .about-journey__card {
  position: relative;
  padding: var(--space-5);
  border-radius: var(--radius-md);
  background: var(--about-panel);
  border: 1px solid var(--about-panel-border);
}
.page-about .about-journey__card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 64px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
}
.page-about .about-journey__card h3 {
  margin: 0 0 var(--space-4);
  color: var(--gold);
  font-size: 18px;
  font-family: var(--font-display);
  letter-spacing: 0.04em;
}
.page-about .about-journey__card dl {
  margin: 0;
  display: grid;
  gap: 8px;
}
.page-about .about-journey__card dl div {
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  font-size: 14px;
  padding-bottom: 8px;
  border-bottom: 1px dashed rgba(242, 183, 5, 0.12);
}
.page-about .about-journey__card dl div:last-child {
  border-bottom: none;
  padding-bottom: 0;
}
.page-about .about-journey__card dt {
  color: var(--ice-blue);
}
.page-about .about-journey__card dd {
  margin: 0;
  color: var(--light-gold);
  text-align: right;
  font-family: var(--font-mono);
}
.page-about .about-journey__contact {
  display: inline-block;
  margin-top: var(--space-4);
  color: var(--gold);
  font-size: 15px;
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 183, 5, 0.4);
  transition: border-color 0.2s ease;
}
.page-about .about-journey__contact:hover {
  border-color: var(--gold);
}
.page-about .about-journey__img {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--about-panel-border);
}
.page-about .about-journey__img img {
  display: block;
  width: 100%;
  height: auto;
}
.page-about .about-journey__timeline {
  position: relative;
  display: grid;
  gap: 28px;
  padding-top: var(--space-2);
}
.page-about .journey-node {
  position: relative;
  padding-left: 56px;
}
.page-about .journey-node__marker {
  position: absolute;
  left: 0;
  top: 4px;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--deep-blue);
  border: 2px solid var(--gold-metal);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--gold);
  box-shadow: 0 0 16px rgba(242, 183, 5, 0.18);
}
.page-about .journey-node__panel {
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(29, 53, 87, 0.65), rgba(10, 22, 48, 0.55));
  border-left: 2px solid var(--gold-metal);
}
.page-about .journey-node__panel .tag {
  margin-bottom: var(--space-3);
}
.page-about .journey-node__panel h3 {
  margin: 0 0 var(--space-2);
  font-size: 18px;
  color: var(--ivory);
}
.page-about .journey-node__panel p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ice-blue);
}

/* ---------- 资质与技术 ---------- */
.page-about .about-credential {
  padding: var(--space-7) 0;
  background: linear-gradient(180deg, transparent, rgba(10, 22, 48, 0.35), transparent);
}
.page-about .about-credential .section-head {
  margin-bottom: var(--space-6);
}
.page-about .about-credential__grid {
  display: grid;
  gap: var(--space-4);
}
.page-about .about-credential__item {
  position: relative;
  padding: var(--space-5);
  border-radius: var(--radius-md);
  background: var(--about-panel);
  border: 1px solid var(--about-panel-border);
  transition: border-color 0.3s ease, transform 0.3s ease;
}
.page-about .about-credential__item:hover {
  border-color: var(--gold-metal);
  transform: translateY(-4px);
}
.page-about .about-credential__icon {
  width: 56px;
  height: 56px;
  margin-bottom: var(--space-3);
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--gold) 0%, var(--gold-metal) 100%);
  color: var(--deep-blue);
  font-family: var(--font-display);
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}
.page-about .about-credential__item h3 {
  margin: 0 0 var(--space-2);
  color: var(--ivory);
  font-size: 18px;
}
.page-about .about-credential__item p {
  margin: 0;
  color: var(--ice-blue);
  font-size: 14px;
  line-height: 1.7;
}
.page-about .about-credential__figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--about-panel-border);
}
.page-about .about-credential__figure img {
  display: block;
  width: 100%;
  height: auto;
}
.page-about .about-credential__team {
  margin-top: var(--space-6);
  display: grid;
  gap: var(--space-4);
}
.page-about .about-credential__team .metric {
  text-align: center;
  padding: var(--space-5) var(--space-4);
  border-radius: var(--radius-md);
  background: rgba(10, 22, 48, 0.55);
  border: 1px solid var(--about-panel-border);
}
.page-about .about-credential__team .metric__value {
  font-size: 36px;
  line-height: 1.1;
  color: var(--gold);
  display: block;
}
.page-about .about-credential__team .metric__label {
  display: block;
  margin-top: var(--space-2);
  color: var(--ice-blue);
  font-size: 14px;
}
.page-about .about-credential__award {
  margin: var(--space-5) auto 0;
  max-width: 480px;
  text-align: center;
  padding: var(--space-4);
  border-radius: var(--radius-full);
  border: 1px dashed var(--gold-metal);
  color: var(--gold);
  font-size: 15px;
  background: rgba(242, 183, 5, 0.05);
}

/* ---------- 数据来源与更新 ---------- */
.page-about .about-datasource {
  padding: var(--space-6) 0;
}
.page-about .about-datasource .section-head {
  max-width: 760px;
  margin-bottom: var(--space-6);
}
.page-about .about-datasource__flow {
  display: grid;
  gap: var(--space-4);
}
.page-about .about-datasource__step {
  position: relative;
  padding: var(--space-5);
  border-radius: var(--radius-md);
  background: rgba(29, 53, 87, 0.4);
  border-top: 2px solid var(--gold-metal);
}
.page-about .about-datasource__num {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 28px;
  color: var(--gold-metal);
  line-height: 1;
  margin-bottom: var(--space-2);
  opacity: 0.75;
}
.page-about .about-datasource__step h3 {
  margin: 0 0 var(--space-2);
  font-size: 18px;
  color: var(--ivory);
}
.page-about .about-datasource__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ice-blue);
}
.page-about .about-datasource__arrow {
  display: none;
}

/* ---------- 用户与回访 ---------- */
.page-about .about-visitor {
  padding: var(--space-7) 0;
  background: linear-gradient(180deg, transparent, rgba(10, 22, 48, 0.35), transparent);
}
.page-about .about-visitor .section-head {
  margin-bottom: var(--space-5);
}
.page-about .about-visitor__layout {
  display: grid;
  gap: var(--space-5);
}
.page-about .about-visitor__content p {
  margin: 0 0 var(--space-4);
  font-size: 16px;
  line-height: 1.8;
  color: var(--ice-blue);
}
.page-about .about-visitor__content p:first-child {
  font-size: 18px;
  color: var(--ivory);
  line-height: 1.85;
}
.page-about .about-visitor__links {
  padding: var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid var(--about-panel-border);
  background: var(--about-panel);
}
.page-about .about-visitor__links ul {
  margin: var(--space-4) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}
.page-about .about-visitor__links li {
  padding-left: var(--space-3);
  position: relative;
}
.page-about .about-visitor__links li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gold-metal);
}
.page-about .about-visitor__links a {
  color: var(--ice-blue);
  text-decoration: none;
  font-size: 15px;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.page-about .about-visitor__links a:hover {
  color: var(--gold);
  border-color: rgba(242, 183, 5, 0.4);
}

/* ---------- 底部 CTA ---------- */
.page-about .about-cta {
  padding: var(--space-6) 0 var(--space-8);
}
.page-about .about-cta__inner {
  padding: var(--space-6) var(--space-5);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(29, 53, 87, 0.85), rgba(10, 22, 48, 0.9));
  border: 1px solid var(--about-panel-border);
  text-align: center;
}
.page-about .about-cta h2 {
  margin: 0 0 var(--space-2);
  color: var(--ivory);
  font-size: 28px;
  font-family: var(--font-display);
  letter-spacing: 0.02em;
}
.page-about .about-cta p {
  margin: 0 0 var(--space-4);
  color: var(--ice-blue);
  font-size: 15px;
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
}

/* ---------- 平板端 ---------- */
@media (min-width: 768px) {
  .page-about .about-cover__grid {
    grid-template-columns: 1fr 0.85fr;
    align-items: start;
  }
  .page-about .about-cover__aside {
    gap: var(--space-5);
  }
  .page-about .about-position__layout {
    grid-template-columns: 1fr 1.1fr;
    align-items: center;
    gap: var(--space-6);
  }
  .page-about .about-credential__grid {
    grid-template-columns: 1fr 1fr 0.55fr;
    align-items: stretch;
  }
  .page-about .about-credential__team {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .about-visitor__layout {
    grid-template-columns: 1.4fr 1fr;
    align-items: start;
  }
}

/* ---------- 桌面端 ---------- */
@media (min-width: 992px) {
  .page-about .about-journey__layout {
    grid-template-columns: 0.8fr 1.2fr;
    gap: var(--space-6);
  }
  .page-about .about-journey__archive {
    position: sticky;
    top: 110px;
  }
  .page-about .about-journey__timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 18px;
    width: 2px;
    background: linear-gradient(180deg, var(--gold-metal), rgba(212, 175, 55, 0.05));
  }
  .page-about .about-datasource__flow {
    grid-template-columns: 1fr auto 1fr auto 1fr;
    align-items: stretch;
    gap: var(--space-4);
  }
  .page-about .about-datasource__arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gold-metal);
    font-size: 28px;
    line-height: 1;
  }
}