.page-about {
  --about-claim-grad: linear-gradient(158deg, #061A15 0%, #0B211C 46%, #101314 100%);
  --about-scan: repeating-linear-gradient(0deg, rgba(56, 242, 208, 0.06) 0 1px, transparent 1px 6px);
  padding-block-start: clamp(84px, 13vw, 116px);
  background: var(--c-night);
  color: var(--c-ink);
  overflow-x: hidden;
}

.page-about .num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0 0 clamp(20px, 3vw, 32px);
  list-style: none;
  font-size: 0.8125rem;
  color: var(--c-mist);
}

.page-about .breadcrumbs__list > li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--c-line);
}

.page-about .breadcrumbs__link {
  color: var(--c-mist);
  text-decoration: none;
}

.page-about .breadcrumbs__link:hover {
  color: var(--c-cyan);
}

.page-about .breadcrumbs__current {
  color: var(--c-ink);
}

/* ---------- 主张宣告 ---------- */
.page-about .about-claim {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(44px, 7vw, 88px) clamp(48px, 8vw, 96px);
  background: var(--about-claim-grad);
}

.page-about .about-claim::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image: var(--about-scan);
  opacity: 0.5;
  pointer-events: none;
}

.page-about .about-claim__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 5vw, 52px);
}

.page-about .about-claim__title {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(2.4rem, 9vw, 5rem);
  line-height: 0.94;
  letter-spacing: -0.03em;
  color: var(--c-ink);
}

.page-about .about-claim__hl {
  color: var(--c-cyan);
}

.page-about .about-claim__lead {
  margin: 0 0 22px;
  max-width: 48ch;
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--c-mist);
}

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

.page-about .about-claim__index a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 0;
  border-bottom: 1px solid var(--c-line);
  color: var(--c-ink);
  font-size: 0.875rem;
  text-decoration: none;
}

.page-about .about-claim__index a:hover,
.page-about .about-claim__index a:focus-visible {
  color: var(--c-cyan);
}

.page-about .about-claim__index b {
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-cyan);
}

.page-about .about-claim__rule {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  height: 2px;
  background: linear-gradient(90deg, var(--c-cyan) 0%, rgba(56, 242, 208, 0.22) 48%, rgba(56, 242, 208, 0) 100%);
}

/* ---------- 区块头统一节奏 ---------- */
.page-about .section-head {
  margin-bottom: clamp(24px, 4vw, 40px);
}

/* ---------- 内容原则 ---------- */
.page-about .about-principles {
  gap: clamp(30px, 5vw, 52px);
}

.page-about .about-principle {
  padding-block: clamp(16px, 2.4vw, 22px);
  border-top: 1px solid var(--c-line);
}

.page-about .about-principle:last-child {
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-principle__head {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .about-principle__head:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 3px;
}

.page-about .about-principle__no {
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--c-cyan);
}

.page-about .about-principle__name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  letter-spacing: -0.01em;
  color: var(--c-ink);
}

.page-about .about-principle__toggle {
  position: relative;
  flex: 0 0 auto;
  margin-left: auto;
  width: 22px;
  height: 22px;
  border: 1px solid var(--c-line);
  border-radius: 50%;
}

.page-about .about-principle__toggle::before,
.page-about .about-principle__toggle::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--c-cyan);
  transform: translate(-50%, -50%);
}

.page-about .about-principle__toggle::before {
  width: 9px;
  height: 1px;
}

.page-about .about-principle__toggle::after {
  width: 1px;
  height: 9px;
  transition: transform 0.24s var(--ease);
}

.page-about .about-principle__head[aria-expanded="true"] .about-principle__toggle::after {
  transform: translate(-50%, -50%) scaleY(0);
}

.page-about .about-principle__text {
  margin: 10px 0 0;
  max-width: 52ch;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--c-mist);
}

.page-about .about-principle__more {
  margin-top: 14px;
  padding: 14px 16px;
  border-radius: var(--r-sm);
  background: var(--c-panel);
  border-left: 2px solid var(--c-orange);
}

.page-about .about-principle__more p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--c-ink);
}

/* ---------- 流程线 ---------- */
.page-about .about-flow {
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--r-lg);
  background: var(--c-panel);
  border: 1px solid var(--c-line);
}

.page-about .about-flow__title {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--c-ink);
}

.page-about .about-flow__list {
  position: relative;
  margin: 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .about-flow__list::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-cyan), var(--c-line) 72%, rgba(30, 74, 66, 0));
}

.page-about .about-flow__item {
  position: relative;
  padding-bottom: 16px;
}

.page-about .about-flow__item:last-child {
  padding-bottom: 0;
}

.page-about .about-flow__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 7px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-night);
  border: 2px solid var(--c-cyan);
}

.page-about .about-flow__item h4 {
  margin: 0 0 3px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--c-ink);
}

.page-about .about-flow__item p {
  margin: 0;
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--c-mist);
}

.page-about .about-flow__figure {
  margin: 20px 0 0;
}

.page-about .about-flow__figure figcaption {
  margin-top: 10px;
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--c-dim);
}

/* ---------- 媒体容器 ---------- */
.page-about .media {
  overflow: hidden;
  border-radius: var(--r-md);
  border: 1px solid var(--c-line);
  background: var(--c-char);
}

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

/* ---------- 团队与流程 ---------- */
.page-about .about-team {
  gap: clamp(28px, 5vw, 52px);
}

.page-about .about-team__caption {
  margin: 12px 0 0;
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--c-dim);
}

.page-about .about-team__body h2 {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: clamp(1.7rem, 4.6vw, 2.6rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.025em;
  color: var(--c-ink);
}

.page-about .about-team__lead {
  margin: 0 0 22px;
  max-width: 62ch;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--c-mist);
}

.page-about .about-team__roles {
  display: grid;
  gap: 12px;
  margin: 0 0 18px;
}

.page-about .about-team__roles > div {
  padding: 14px 16px;
  border-radius: var(--r-sm);
  background: var(--c-panel);
  border: 1px solid var(--c-line);
}

.page-about .about-team__roles dt {
  margin-bottom: 4px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--c-cyan);
}

.page-about .about-team__roles dd {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.68;
  color: var(--c-mist);
}

.page-about .about-team__note {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--c-cyan);
  font-size: 0.875rem;
  line-height: 1.78;
  color: var(--c-mist);
}

/* ---------- 版本轨迹 ---------- */
.page-about .about-timeline {
  position: relative;
  margin-top: clamp(20px, 3vw, 34px);
}

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

.page-about .about-timeline__list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline__node {
  position: relative;
  padding: 20px 18px 20px 20px;
  border-radius: var(--r-md);
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-left: 2px solid var(--c-cyan);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .about-timeline__node:hover,
.page-about .about-timeline__node:focus {
  transform: translateY(-3px);
  border-color: rgba(56, 242, 208, 0.45);
}

.page-about .about-timeline__node:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 3px;
}

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

.page-about .about-timeline__ver {
  margin: 0 0 6px;
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--c-cyan);
}

.page-about .about-timeline__name {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-ink);
}

.page-about .about-timeline__year {
  margin: 0;
  font-size: 0.875rem;
  color: var(--c-orange);
}

.page-about .about-timeline__detail {
  max-height: 0;
  margin: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--c-mist);
  transition: max-height 0.34s var(--ease), opacity 0.34s var(--ease), margin-top 0.34s var(--ease);
}

.page-about .about-timeline__node:hover .about-timeline__detail,
.page-about .about-timeline__node:focus .about-timeline__detail,
.page-about .about-timeline__node:focus-within .about-timeline__detail {
  max-height: 220px;
  margin-top: 10px;
  opacity: 1;
}

.page-about .about-track__hint {
  margin: 20px 0 0;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--c-dim);
}

/* ---------- 覆盖范围数字板 ---------- */
.page-about .about-coverage {
  gap: clamp(28px, 5vw, 52px);
}

.page-about .about-coverage__body h2 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: clamp(1.7rem, 4.6vw, 2.6rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.025em;
  color: var(--c-ink);
}

.page-about .about-coverage__desc {
  margin: 0;
  max-width: 56ch;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--c-mist);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 24px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--c-line);
}

.page-about .about-figure {
  padding: 18px 16px;
  background: var(--c-night);
}

.page-about .about-figure__value {
  margin: 0;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: clamp(1.9rem, 5vw, 2.8rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-num);
}

.page-about .about-figure--cyan .about-figure__value {
  color: var(--c-cyan);
}

.page-about .about-figure--orange .about-figure__value {
  color: var(--c-orange);
}

.page-about .about-figure__unit {
  display: block;
  margin-top: 8px;
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--c-ink);
}

.page-about .about-figure__note {
  margin: 6px 0 0;
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--c-mist);
}

.page-about .about-coverage__media {
  margin: 0;
}

.page-about .about-coverage__media figcaption {
  margin-top: 12px;
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--c-dim);
}

/* ---------- 合规说明 ---------- */
.page-about .about-legal h2 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--c-ink);
}

.page-about .about-legal__grid {
  display: grid;
  gap: 0 clamp(20px, 4vw, 40px);
  margin-top: 24px;
}

.page-about .about-legal__item {
  padding: 18px 0;
  border-top: 1px solid var(--c-line);
}

.page-about .about-legal__item h3 {
  margin: 0 0 6px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--c-ink);
}

.page-about .about-legal__item p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.72;
  color: var(--c-mist);
}

.page-about .about-legal__item a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(56, 242, 208, 0.32);
}

.page-about .about-legal__item a:hover {
  border-bottom-color: var(--c-cyan);
}

/* ---------- 协作生态 ---------- */
.page-about .about-eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-eco li {
  padding: 20px 18px;
  border-radius: var(--r-md);
  background: var(--c-panel);
  border: 1px solid var(--c-line);
}

.page-about .about-eco h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-ink);
}

.page-about .about-eco p {
  margin: 0;
  font-size: 0.8125rem;
  line-height: 1.72;
  color: var(--c-mist);
}

/* ---------- 行动区 ---------- */
.page-about .about-cta {
  border-top: 1px solid var(--c-line);
}

.page-about .about-cta__inner {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .about-cta h2 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--c-ink);
}

.page-about .about-cta__text p {
  margin: 0;
  max-width: 58ch;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--c-mist);
}

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

.page-about .about-cta__links {
  margin: 0;
  padding-top: 18px;
  border-top: 1px solid var(--c-line);
  font-size: 0.8125rem;
  line-height: 1.9;
  color: var(--c-dim);
}

.page-about .about-cta__links a {
  margin-inline: 2px;
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(56, 242, 208, 0.3);
}

.page-about .about-cta__links a:hover {
  border-bottom-color: var(--c-cyan);
}

/* ---------- 窄屏适配 ---------- */
@media (max-width: 520px) {
  .page-about .about-claim__title br {
    display: none;
  }
}

@media (max-width: 420px) {
  .page-about .about-figures {
    grid-template-columns: minmax(0, 1fr);
  }

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

/* ---------- 中等屏 ---------- */
@media (min-width: 760px) {
  .page-about .about-legal__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-cta__actions {
    gap: 14px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-claim__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .about-timeline__line {
    display: block;
    position: absolute;
    left: 0;
    right: 0;
    top: -4px;
    width: 100%;
    height: 92px;
  }

  .page-about .about-timeline__line polyline {
    fill: none;
    stroke: var(--c-line);
    stroke-width: 2;
    stroke-dasharray: 7 7;
    vector-effect: non-scaling-stroke;
  }

  .page-about .about-timeline__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
    padding-top: 78px;
  }

  .page-about .about-timeline__node:nth-child(1) {
    margin-top: 0;
  }

  .page-about .about-timeline__node:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .about-timeline__node:nth-child(3) {
    margin-top: 10px;
  }

  .page-about .about-timeline__node:nth-child(4) {
    margin-top: 38px;
  }

  .page-about .about-timeline__dot {
    display: block;
    position: absolute;
    top: -7px;
    left: 50%;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--c-cyan);
    box-shadow: 0 0 0 4px rgba(56, 242, 208, 0.14);
    transform: translateX(-50%);
  }

  .page-about .about-cta__inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 22px 40px;
  }

  .page-about .about-cta__links {
    grid-column: 1 / -1;
  }
}

/* ---------- 宽屏微调 ---------- */
@media (min-width: 1120px) {
  .page-about .about-eco {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .about-eco li:nth-child(2) {
    transform: translateY(14px);
  }

  .page-about .about-eco li:nth-child(3) {
    transform: translateY(-8px);
  }

  .page-about .about-figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-principle__toggle::after,
  .page-about .about-timeline__node,
  .page-about .about-timeline__detail {
    transition: none;
  }

  .page-about .about-timeline__node:hover,
  .page-about .about-timeline__node:focus {
    transform: none;
  }
}