.page-about {
  --about-axis-w: 172px;
  --about-record-gap: 28px;
  color: var(--gray-700);
}

.page-about .about-top {
  padding-top: 20px;
  padding-bottom: 4px;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  align-items: start;
  padding-top: 20px;
  padding-bottom: 32px;
}

.page-about .about-hero__title {
  margin: 10px 0 0;
  color: var(--ink);
  font-size: var(--t-32);
  line-height: 1.28;
  letter-spacing: -0.01em;
}

.page-about .about-hero__lede {
  margin: 16px 0 0;
  color: var(--gray-700);
  font-size: var(--t-16);
  line-height: 1.8;
}

.page-about .about-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__plate {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 264px;
  padding: 24px;
  overflow: hidden;
  border-radius: var(--r-lg);
  background: linear-gradient(168deg, var(--blue-900) 0%, #103354 62%, #0c2340 100%);
  color: #EAF2F9;
}

.page-about .about-hero__plate::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.07) 0 1px, transparent 1px 44px),
    repeating-linear-gradient(180deg, rgba(255, 255, 255, 0.05) 0 1px, transparent 1px 44px);
  pointer-events: none;
}

.page-about .about-hero__plate > * {
  position: relative;
  z-index: 1;
}

.page-about .about-plate__eyebrow {
  margin: 0;
  font-size: var(--t-12);
  letter-spacing: 0.06em;
  color: #9FC3E2;
}

.page-about .about-plate__year {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--t-56);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: #FFFFFF;
}

.page-about .about-plate__yearnote {
  margin: 0 0 12px;
  font-size: var(--t-14);
  color: #B9D2E6;
}

.page-about .about-plate__list {
  margin: auto 0 0;
  padding: 16px 0 0;
  list-style: none;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  display: grid;
  gap: 8px;
}

.page-about .about-plate__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  font-size: var(--t-14);
}

.page-about .about-plate__k {
  color: #A8C6DE;
}

.page-about .about-plate__v {
  color: #FFFFFF;
  font-size: var(--t-14);
}

/* ============ 数字条 ============ */
.page-about .about-stats {
  padding-bottom: 40px;
}

.page-about .about-stats__list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

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

.page-about .about-stats__label {
  font-size: var(--t-12);
  color: var(--gray-700);
  letter-spacing: 0.02em;
}

.page-about .about-stats__num {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-size: var(--t-32);
  font-weight: 600;
  line-height: 1.1;
  color: var(--blue-700);
}

.page-about .about-stats__unit {
  font-size: var(--t-14);
  font-weight: 400;
  color: var(--gray-700);
  margin-left: 2px;
}

/* ============ 区块标题 ============ */
.page-about .about-head__title {
  margin: 10px 0 0;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.page-about .about-head__lede {
  margin: 14px 0 0;
  max-width: 62ch;
}

.page-about .about-sec .section-head,
.page-about .about-team .section-head,
.page-about .about-trust .section-head,
.page-about .about-service .section-head,
.page-about .about-timeline .section-head {
  margin-bottom: 32px;
}

/* ============ 品牌定位 ============ */
.page-about .about-position {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.page-about .about-position__text p {
  margin: 0 0 14px;
  font-size: var(--t-16);
  line-height: 1.8;
}

.page-about .about-position__sub {
  margin: 22px 0 0;
  font-weight: 500;
  color: var(--ink);
}

.page-about .about-signals {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-signals li {
  position: relative;
  padding: 12px 0 12px 26px;
  border-bottom: 1px solid var(--line);
  font-size: var(--t-16);
  line-height: 1.7;
}

.page-about .about-signals li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 1.32em;
  width: 12px;
  height: 2px;
  background: var(--blue-500);
}

.page-about .about-position__media,
.page-about .about-team__media,
.page-about .about-timeline__media {
  margin: 0;
}

.page-about .about-position__media {
  aspect-ratio: 14 / 9;
}

.page-about .about-team__media {
  aspect-ratio: 3 / 2;
  margin-top: 32px;
}

.page-about .about-timeline__media {
  aspect-ratio: 12 / 7;
  margin-top: 40px;
}

.page-about .about-position__media img,
.page-about .about-team__media img,
.page-about .about-timeline__media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-lines-block {
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.page-about .about-lines-block__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: var(--t-20);
  font-weight: 600;
  color: var(--ink);
}

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

.page-about .about-lines__item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  transition: background-color var(--fast);
}

.page-about .about-lines__item:hover {
  background: var(--gray-50);
}

.page-about .about-lines__num {
  font-size: var(--t-14);
  color: var(--brass-ink);
  background: var(--brass-100);
  border: 1px solid var(--line-brass);
  border-radius: var(--r-sm);
  height: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  letter-spacing: 0.02em;
}

.page-about .about-lines__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: var(--t-20);
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-lines__text {
  margin: 0;
  font-size: var(--t-14);
  line-height: 1.75;
}

.page-about .about-lines-block__more {
  margin: 18px 0 0;
  font-size: var(--t-14);
}

.page-about .about-lines-block__more a {
  color: var(--blue-700);
  text-decoration: underline;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--fast), color var(--fast);
}

.page-about .about-lines-block__more a:hover {
  color: var(--blue-500);
  text-decoration-color: var(--blue-500);
}

/* ============ 发展历程 ============ */
.page-about .about-timeline__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .about-axis__title {
  margin: 0 0 10px;
  font-size: var(--t-12);
  letter-spacing: 0.08em;
  color: var(--gray-700);
  text-transform: uppercase;
}

.page-about .about-axis__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 10px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-axis__item {
  flex: 0 0 auto;
}

.page-about .about-axis__link {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--paper);
  color: var(--gray-700);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color var(--fast), background-color var(--fast), color var(--fast);
}

.page-about .about-axis__link:hover {
  border-color: var(--line-blue);
  color: var(--blue-700);
}

.page-about .about-axis__link[aria-current],
.page-about .about-axis__link.is-active {
  border-color: var(--line-blue);
  background: var(--blue-100);
  color: var(--blue-700);
}

.page-about .about-axis__num {
  font-size: var(--t-14);
  letter-spacing: 0.02em;
}

.page-about .about-axis__label {
  font-size: var(--t-12);
  color: var(--gray-700);
}

.page-about .about-flow {
  display: grid;
  gap: var(--about-record-gap);
}

.page-about .about-record {
  position: relative;
  padding: 22px 20px 24px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--paper);
  transition: border-color var(--base), transform var(--base);
}

.page-about .about-record:hover {
  border-color: var(--line-blue);
  transform: translateX(2px);
}

.page-about .about-record__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding-bottom: 14px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-record__no {
  font-size: var(--t-12);
  letter-spacing: 0.04em;
  color: var(--brass-ink);
  background: var(--brass-100);
  border: 1px solid var(--line-brass);
  border-radius: var(--r-sm);
  padding: 3px 8px;
}

.page-about .about-record__year {
  font-size: var(--t-24);
  font-weight: 500;
  color: var(--blue-700);
  margin-right: auto;
  letter-spacing: 0.01em;
}

.page-about .about-record__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: var(--t-20);
  font-weight: 600;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .about-record__body p {
  margin: 0 0 12px;
  font-size: var(--t-16);
  line-height: 1.8;
}

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

/* ============ 团队 ============ */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.page-about .about-chart {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-chart__box {
  fill: var(--gray-50);
  stroke: var(--line-strong);
  stroke-width: 1;
}

.page-about .about-chart__hub {
  fill: var(--blue-900);
  stroke: none;
}

.page-about .about-chart__link {
  stroke: var(--line-strong);
  stroke-width: 1.5;
  stroke-dasharray: 4 4;
}

.page-about .about-chart__label {
  fill: var(--ink);
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 500;
}

.page-about .about-chart__sub {
  fill: var(--gray-700);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.02em;
}

.page-about .about-chart__hub-label {
  fill: #FFFFFF;
  font-family: var(--font-ui);
  font-size: 14px;
  font-weight: 500;
}

.page-about .about-chart__hub-sub {
  fill: #9FC3E2;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.02em;
}

.page-about .about-team__cards {
  display: grid;
  gap: 14px;
}

.page-about .about-role {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--celadon-600);
  border-radius: var(--r-md);
  background: var(--paper);
  transition: background-color var(--base), border-color var(--base);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within,
.page-about .about-role:focus {
  background: var(--gray-50);
  border-left-color: var(--blue-700);
}

.page-about .about-role:focus-visible {
  outline: 2px solid var(--blue-500);
  outline-offset: 2px;
}

.page-about .about-role__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-role__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--t-20);
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-role__num {
  font-size: var(--t-14);
  color: var(--celadon-600);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.page-about .about-role__text {
  margin: 8px 0 0;
  font-size: var(--t-14);
  line-height: 1.75;
}

.page-about .about-role__more {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: var(--t-14);
  line-height: 1.75;
  color: var(--gray-700);
  border-top: 1px dashed transparent;
  transition: max-height var(--base), opacity var(--base), margin-top var(--base), border-color var(--base);
}

.page-about .about-role:hover .about-role__more,
.page-about .about-role:focus .about-role__more,
.page-about .about-role:focus-within .about-role__more {
  max-height: 8em;
  opacity: 1;
  margin-top: 12px;
  padding-top: 10px;
  border-top-color: var(--line);
}

/* ============ 资质与合规 ============ */
.page-about .about-trust__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.page-about .about-trust__numbers {
  display: grid;
  gap: 18px;
}

.page-about .about-trust__stat {
  padding: 20px;
  border: 1px solid var(--line-celadon);
  border-radius: var(--r-lg);
  background: var(--celadon-200);
}

.page-about .about-trust__num {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--t-44);
  font-weight: 700;
  line-height: 1;
  color: var(--blue-900);
}

.page-about .about-trust__unit {
  font-size: var(--t-20);
  font-weight: 600;
  margin-left: 2px;
}

.page-about .about-trust__cap {
  margin: 10px 0 0;
  font-size: var(--t-14);
  line-height: 1.6;
  color: var(--gray-700);
}

.page-about .about-folds {
  border-top: 1px solid var(--line-strong);
}

.page-about .about-folds .fold {
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-folds .fold__body {
  padding-bottom: 18px;
}

.page-about .about-folds .fold__body p {
  margin: 0;
  font-size: var(--t-14);
  line-height: 1.8;
}

/* ============ 长期服务 ============ */
.page-about .about-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-steps__item {
  background: var(--paper);
  padding: 16px;
  transition: background-color var(--fast);
}

.page-about .about-steps__item:hover {
  background: var(--gray-50);
}

.page-about .about-steps__num {
  font-size: var(--t-12);
  letter-spacing: 0.04em;
  color: var(--blue-500);
}

.page-about .about-steps__name {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: var(--t-16);
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-service__panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 32px;
  padding: 26px 22px;
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, #123B60 0%, var(--blue-900) 72%);
  color: #EAF2F9;
}

.page-about .about-service__num {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--t-56);
  font-weight: 700;
  line-height: 1;
  color: #FFFFFF;
}

.page-about .about-service__unit {
  font-size: var(--t-24);
  margin-left: 2px;
}

.page-about .about-service__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: var(--t-20);
  font-weight: 600;
  color: #FFFFFF;
}

.page-about .about-service__body p {
  margin: 0 0 12px;
  font-size: var(--t-14);
  line-height: 1.8;
  color: #D5E4F0;
}

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

.page-about .about-service__body a {
  color: #A9CEEE;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(169, 206, 238, 0.5);
  transition: color var(--fast), text-decoration-color var(--fast);
}

.page-about .about-service__body a:hover {
  color: #FFFFFF;
  text-decoration-color: #FFFFFF;
}

/* ============ 走进安信 ============ */
.page-about .about-start {
  padding-bottom: 64px;
}

.page-about .about-start__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  padding: 28px 22px;
  border-radius: var(--r-lg);
  background: var(--blue-900);
  color: #EAF2F9;
}

.page-about .about-start__eyebrow {
  margin: 0;
  color: #9FC3E2;
}

.page-about .about-start__title {
  margin: 10px 0 0;
  color: #FFFFFF;
}

.page-about .about-start__text {
  margin: 12px 0 0;
  font-size: var(--t-16);
  line-height: 1.8;
  color: #D5E4F0;
}

.page-about .about-start__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ============ 回到年份轴 ============ */
.page-about .about-back {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 20;
  display: inline-flex;
  align-items: center;
  padding: 10px 16px;
  border: 1px solid var(--blue-500);
  border-radius: var(--r-pill);
  background: var(--blue-700);
  color: #FFFFFF;
  font-size: var(--t-12);
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: background-color var(--fast), border-color var(--fast);
}

.page-about .about-back:hover {
  background: var(--blue-900);
  border-color: var(--blue-900);
}

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-trust__numbers {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-team__cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 48px;
    padding-top: 36px;
    padding-bottom: 48px;
  }

  .page-about .about-hero__title {
    font-size: var(--t-44);
  }

  .page-about .about-hero__plate {
    min-height: 340px;
    padding: 32px;
  }

  .page-about .about-position {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
    gap: 40px;
  }

  .page-about .about-steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-service__panel {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 32px;
    padding: 36px 32px;
    align-items: start;
  }

  .page-about .about-start__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
    padding: 40px 36px;
  }

  .page-about .about-start__acts {
    flex-wrap: nowrap;
  }
}

@media (min-width: 960px) {
  .page-about .about-timeline__grid {
    grid-template-columns: var(--about-axis-w) minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .about-axis {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .about-axis__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0 0 0 20px;
    position: relative;
  }

  .page-about .about-axis__list::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 10px;
    bottom: 10px;
    width: 2px;
    background: var(--line-strong);
  }

  .page-about .about-axis__item {
    flex: 1 1 auto;
  }

  .page-about .about-axis__link {
    border: 0;
    border-radius: 0;
    background: transparent;
    padding: 9px 0;
    position: relative;
  }

  .page-about .about-axis__link::before {
    content: "";
    position: absolute;
    left: -20px;
    top: 15px;
    width: 10px;
    height: 10px;
    border: 2px solid var(--line-strong);
    border-radius: 50%;
    background: var(--paper);
    transition: border-color var(--fast), background-color var(--fast);
  }

  .page-about .about-axis__link:hover {
    background: transparent;
    border-color: transparent;
  }

  .page-about .about-axis__link:hover::before {
    border-color: var(--blue-500);
  }

  .page-about .about-axis__link[aria-current],
  .page-about .about-axis__link.is-active {
    background: transparent;
    border-color: transparent;
    color: var(--blue-700);
  }

  .page-about .about-axis__link[aria-current]::before,
  .page-about .about-axis__link.is-active::before {
    border-color: var(--blue-500);
    background: var(--blue-500);
  }

  .page-about .about-record__body {
    column-count: 2;
    column-gap: 34px;
  }

  .page-about .about-record__head {
    margin-bottom: 18px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: 44px;
  }

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

  .page-about .about-trust__grid {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 48px;
  }

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

  .page-about .about-back {
    display: none;
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero__title {
    font-size: var(--t-56);
  }

  .page-about .about-stats {
    padding-bottom: 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
  }
}