.page-about {
  --about-line: rgba(30, 46, 74, .9);
  --about-line-soft: rgba(30, 46, 74, .55);
  --about-pad: clamp(48px, 7vw, 104px);
  position: relative;
  color: var(--fog);
  background: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate);
}

.page-about .breadcrumb-item {
  display: inline-flex;
  align-items: center;
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin: 0 6px;
  color: var(--grid);
}

.page-about .breadcrumb-link {
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .breadcrumb-current {
  color: var(--fog);
}

/* 章节通用 */
.page-about .about-section {
  position: relative;
  overflow: hidden;
  padding: var(--about-pad) 0;
}

.page-about .about-no {
  position: absolute;
  top: clamp(14px, 3vw, 40px);
  right: clamp(10px, 3vw, 44px);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(64px, 13vw, 168px);
  line-height: .8;
  letter-spacing: -.05em;
  color: rgba(41, 242, 214, .07);
  pointer-events: none;
  user-select: none;
}

.page-about .about-no--orange {
  color: rgba(255, 122, 47, .1);
}

.page-about .about-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--cyan);
  opacity: .8;
}

.page-about .about-h2 {
  margin: 0 0 18px;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4.4vw, 46px);
  line-height: 1.2;
  letter-spacing: -.015em;
  color: var(--fog);
}

.page-about .about-lede {
  max-width: 62ch;
  margin: 0 0 clamp(28px, 4vw, 44px);
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.85;
  color: var(--slate);
}

.page-about .about-prose {
  max-width: 58ch;
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--slate);
}

/* 主张声明 */
.page-about .about-statement {
  position: relative;
  overflow: hidden;
  padding: clamp(30px, 5vw, 60px) 0 clamp(48px, 7vw, 92px);
  background:
    radial-gradient(900px 420px at 8% -12%, rgba(41, 242, 214, .1), transparent 64%),
    linear-gradient(158deg, rgba(21, 27, 63, .96) 0%, rgba(6, 13, 27, .99) 70%);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-statement::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-soft) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: .45;
  pointer-events: none;
}

.page-about .about-statement .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  padding-bottom: clamp(30px, 5vw, 56px);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-title {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(40px, 10vw, 92px);
  line-height: 1.02;
  letter-spacing: -.03em;
  transform: skewX(-3deg);
  transform-origin: left bottom;
}

.page-about .about-title .title-brand {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: clamp(13px, 2vw, 20px);
  font-weight: 700;
  letter-spacing: .42em;
  color: var(--cyan);
  transform: skewX(3deg);
}

.page-about .about-title .title-main {
  display: block;
  color: var(--fog);
  text-shadow: 0 0 42px rgba(41, 242, 214, .18);
}

.page-about .about-hero .about-lede {
  margin-bottom: 26px;
  color: #c3d2e6;
}

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

.page-about .about-aside {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding-left: 18px;
  border-left: 1px solid var(--about-line);
}

.page-about .about-vertical {
  margin: 0;
  font-size: 12px;
  letter-spacing: .3em;
  color: var(--orange);
}

.page-about .about-aside-note {
  margin: 0;
  max-width: 34ch;
  font-size: 13px;
  line-height: 1.8;
  color: var(--slate);
}

/* 三条支撑 */
.page-about .about-principles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .principle {
  position: relative;
  padding: 24px 0 26px;
  border-top: 1px solid var(--about-line-soft);
}

.page-about .principle-no {
  display: block;
  margin-bottom: 10px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--orange);
}

.page-about .principle-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--fog);
}

.page-about .principle-text {
  margin: 0;
  max-width: 40ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--slate);
}

/* 图片容器 */
.page-about .about-media {
  margin: 0;
  border: 1px solid var(--about-line);
  background: var(--frost);
  backdrop-filter: blur(14px);
}

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

.page-about .about-media--wide {
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-caption {
  display: block;
  padding: 10px 14px;
  border-top: 1px solid var(--about-line);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--slate);
}

/* 时间轴 */
.page-about .about-tabs {
  border-top: 1px solid var(--about-line);
}

.page-about .about-track {
  display: flex;
  align-items: stretch;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-node {
  flex: 0 0 auto;
  min-width: 176px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0;
  padding: 20px 22px 20px 0;
  background: none;
  border: 0;
  border-top: 3px solid var(--grid);
  text-align: left;
  font: inherit;
  color: var(--slate);
  scroll-snap-align: start;
  cursor: pointer;
  transition: color .18s var(--ease), border-color .18s var(--ease), transform .18s var(--ease);
}

.page-about .about-node:hover,
.page-about .about-node:focus-visible {
  color: var(--fog);
  border-top-color: rgba(41, 242, 214, .5);
}

.page-about .about-node[aria-selected="true"] {
  border-top-color: var(--cyan);
  color: var(--fog);
}

.page-about .about-node[aria-selected="true"] .node-year {
  color: var(--cyan);
}

.page-about .node-year {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 34px);
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--fog);
}

.page-about .node-name {
  font-size: 13px;
  line-height: 1.6;
}

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

.page-about .about-panel {
  padding: 26px 0 4px;
}

.page-about .about-panel[hidden] {
  display: none;
}

.page-about .about-panel:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

.page-about .about-panel-text {
  max-width: 62ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: #c3d2e6;
}

/* 流程区 */
.page-about .about-flow-section {
  background:
    radial-gradient(760px 380px at 92% 0%, rgba(41, 242, 214, .09), transparent 62%),
    linear-gradient(180deg, rgba(6, 48, 46, .92) 0%, rgba(6, 13, 27, .98) 78%);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0 0 clamp(34px, 5vw, 56px);
  padding: 0;
  list-style: none;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .flow-step {
  position: relative;
  padding: 24px 20px 28px;
  background: rgba(4, 8, 15, .72);
  transition: background .18s var(--ease), box-shadow .18s var(--ease);
}

.page-about .flow-step:hover,
.page-about .flow-step:focus-visible {
  background: rgba(6, 48, 46, .8);
  box-shadow: inset 0 0 0 1px rgba(41, 242, 214, .35);
}

.page-about .flow-no {
  display: block;
  margin-bottom: 14px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .22em;
  color: var(--orange);
}

.page-about .flow-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: .04em;
  color: var(--fog);
}

.page-about .flow-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--slate);
}

.page-about .about-flow-foot {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 40px);
  align-items: start;
}

.page-about .about-flow-note {
  padding: 20px 0 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-flow-note-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 800;
  color: var(--fog);
}

.page-about .about-flow-note-text {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate);
}

/* 团队与协作 */
.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
}

.page-about .about-team-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team .tag {
  padding: 7px 13px;
  border: 1px solid var(--about-line);
  background: var(--frost);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: #c3d2e6;
}

.page-about .about-media--panel {
  margin: 0;
}

/* 资质与认可 */
.page-about .about-honors {
  background:
    radial-gradient(700px 360px at 6% 0%, rgba(255, 122, 47, .12), transparent 60%),
    linear-gradient(180deg, rgba(74, 16, 39, .9) 0%, rgba(6, 13, 27, .98) 76%);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-honor-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: rgba(255, 255, 255, .1);
  border: 1px solid rgba(255, 255, 255, .12);
}

.page-about .honor-card {
  padding: clamp(22px, 3vw, 34px);
  background: rgba(6, 13, 27, .72);
  backdrop-filter: blur(14px);
}

.page-about .honor-year {
  margin: 0 0 14px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .22em;
  color: var(--orange);
}

.page-about .honor-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(17px, 2.2vw, 22px);
  font-weight: 800;
  line-height: 1.4;
  color: var(--fog);
}

.page-about .honor-text {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--slate);
}

.page-about .about-fineprint {
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, .12);
  font-size: 13px;
  line-height: 1.8;
  color: var(--slate);
}

/* 用户规模 */
.page-about .reach-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 clamp(24px, 4vw, 34px);
  padding: 0;
  list-style: none;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .reach-item {
  padding: clamp(18px, 3vw, 30px) clamp(16px, 2.5vw, 24px);
  background: rgba(4, 8, 15, .66);
}

.page-about .reach-value {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: clamp(30px, 6vw, 56px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--cyan);
}

.page-about .reach-unit {
  margin-left: 4px;
  font-size: .42em;
  color: var(--slate);
}

.page-about .reach-label {
  margin: 0;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--slate);
}

.page-about .about-reach-note {
  margin: 0;
  max-width: 66ch;
}

/* 收尾 */
.page-about .about-next {
  position: relative;
  overflow: hidden;
  padding: var(--about-pad) 0 calc(var(--about-pad) + 12px);
  background: linear-gradient(180deg, rgba(21, 27, 63, .7) 0%, rgba(6, 13, 27, 1) 72%);
  border-top: 1px solid var(--about-line);
}

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

@media (min-width: 720px) {
  .page-about .about-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 clamp(20px, 3vw, 36px);
  }

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

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

  .page-about .reach-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-aside {
    flex-direction: row;
    align-items: flex-start;
    gap: 24px;
  }

  .page-about .about-vertical {
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    letter-spacing: .34em;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(36px, 5vw, 72px);
    align-items: end;
  }

  .page-about .about-aside {
    flex-direction: column;
    padding-left: 24px;
  }

  .page-about .about-vertical {
    writing-mode: horizontal-tb;
    transform: none;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .flow-step:nth-child(even) {
    padding-top: 46px;
  }

  .page-about .about-flow-foot {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(30px, 4vw, 58px);
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .about-principles .principle:first-child {
    padding-left: 0;
  }

  .page-about .node-name {
    max-width: 14ch;
  }
}

@media (min-width: 1240px) {
  .page-about .about-node {
    min-width: 210px;
    padding-right: 34px;
  }

  .page-about .about-lede {
    max-width: 58ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .flow-step,
  .page-about .breadcrumb-link {
    transition: none;
  }
}