.page-about {
  position: relative;
  color: var(--ice);
  padding-bottom: clamp(56px, 8vw, 112px);
}

.page-about .about-shell {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* 面包屑间距 */
.page-about .breadcrumb {
  padding-top: clamp(18px, 3vw, 32px);
}

/* ---------- 开篇 ---------- */
.page-about .about-hero {
  max-width: 940px;
  padding: clamp(44px, 8vw, 118px) 0 clamp(28px, 4vw, 52px);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 20px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 8.4vw, 88px);
  line-height: 1.02;
  letter-spacing: -.02em;
}

.page-about .about-hero__title span,
.page-about .about-hero__title em {
  display: block;
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--cyan);
}

.page-about .about-hero__lede {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 660px;
  font-size: clamp(15px, 1.6vw, 17.5px);
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 3vw, 30px);
  margin: clamp(32px, 5vw, 56px) 0 0;
  padding: clamp(22px, 3vw, 30px) 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-stats__item {
  padding-left: 12px;
  border-left: 2px solid var(--cyan);
}

.page-about .about-stats__item:nth-child(2) {
  border-left-color: var(--cyan-soft);
}

.page-about .about-stats__item:nth-child(3) {
  border-left-color: var(--magenta);
}

.page-about .about-stats__item:nth-child(4) {
  border-left-color: var(--amber);
}

.page-about .about-stats dt {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .about-stats dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(24px, 4vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--ice);
}

.page-about .about-stats dd span {
  font-size: .54em;
  margin-left: 2px;
  color: var(--mist);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(28px, 5vw, 60px) 0;
  border: 1px solid var(--line);
  background: var(--deep);
}

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

.page-about .about-figure figcaption {
  padding: 12px 16px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--mist);
  border-top: 1px solid var(--line);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  margin-top: clamp(48px, 8vw, 100px);
  padding-top: clamp(32px, 5vw, 56px);
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-section__num {
  margin: 0;
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--magenta);
}

.page-about .about-section__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.16;
  letter-spacing: -.01em;
}

.page-about .about-section__lede {
  margin: 16px 0 0;
  max-width: 660px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin-top: clamp(30px, 4vw, 48px);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(56, 232, 255, .18) 68%, transparent);
}

.page-about .about-node {
  position: relative;
  padding: 0 0 clamp(26px, 4vw, 44px) 34px;
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 15px;
  height: 15px;
  background: var(--space);
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-node:hover::before,
.page-about .about-node:focus-within::before {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-node__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(20px, 3vw, 27px);
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--cyan-soft);
  opacity: .5;
  transition: opacity var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-node:hover .about-node__year,
.page-about .about-node:focus-within .about-node__year {
  opacity: 1;
  color: var(--cyan);
}

.page-about .about-node__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.35;
}

.page-about .about-node__text {
  margin: 8px 0 0;
  max-width: 620px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-timeline__media {
  margin: 0 0 clamp(26px, 4vw, 44px);
  padding-left: 34px;
}

.page-about .about-timeline__media img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  object-fit: cover;
}

.page-about .about-timeline__media figcaption {
  margin-top: 8px;
  font-size: 12px;
  color: var(--mist);
}

/* ---------- 产品线 ---------- */
.page-about .about-lines {
  list-style: none;
  display: grid;
  gap: 12px;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
}

.page-about .about-line {
  padding: 18px 20px;
  background: var(--deep);
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  transition: background var(--dur) var(--ease), border-left-color var(--dur) var(--ease);
}

.page-about .about-line:nth-child(even) {
  border-left-color: var(--magenta);
}

.page-about .about-line:hover {
  background: var(--cabin);
}

.page-about .about-line__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-line__idx {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--mist);
}

.page-about .about-line__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(16px, 2vw, 19px);
}

.page-about .about-line__text {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(24px, 4vw, 42px);
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .about-team__lead {
  padding: clamp(20px, 3vw, 30px);
  background: var(--deep);
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan);
}

.page-about .about-team__big {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(52px, 10vw, 82px);
  font-weight: 700;
  line-height: .92;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .about-team__caption {
  margin: 14px 0 0;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .about-team__note {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-team__list {
  list-style: none;
  display: grid;
  gap: clamp(18px, 2.6vw, 26px);
  margin: 0;
  padding: 0;
}

.page-about .about-team__list li {
  padding-left: 16px;
  border-left: 1px solid var(--line);
  transition: border-left-color var(--dur) var(--ease);
}

.page-about .about-team__list li:hover {
  border-left-color: var(--amber);
}

.page-about .about-team__list h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(16px, 2vw, 18px);
}

.page-about .about-team__list p {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-team__list a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(157, 246, 255, .4);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

/* ---------- 服务对照面板 ---------- */
.page-about .about-panel {
  margin-top: clamp(26px, 4vw, 42px);
  padding: clamp(24px, 4vw, 44px);
  background: linear-gradient(140deg, var(--cabin) 0%, var(--deep) 58%, var(--space) 100%);
  border: 1px solid var(--line);
  border-left: 2px solid var(--magenta);
}

.page-about .about-panel__cycle {
  margin: 0;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--amber);
}

.page-about .about-panel__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.6vw, 26px);
}

.page-about .about-panel__text {
  margin: 14px 0 0;
  max-width: 680px;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-panel__link {
  display: inline-block;
  margin-top: 22px;
  padding: 10px 18px;
  font-size: 14px;
  color: var(--space);
  background: var(--cyan);
  text-decoration: none;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-panel__link:hover {
  background: var(--cyan-soft);
}

/* ---------- 合作生态 ---------- */
.page-about .about-quad {
  display: grid;
  gap: 12px;
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .about-quad__cell {
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--deep);
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan);
  transition: background var(--dur) var(--ease);
}

.page-about .about-quad__cell:nth-child(2) {
  border-top-color: var(--magenta);
}

.page-about .about-quad__cell:nth-child(3) {
  border-top-color: var(--amber);
}

.page-about .about-quad__cell:nth-child(4) {
  border-top-color: var(--cyan-soft);
}

.page-about .about-quad__cell:hover {
  background: var(--cabin);
}

.page-about .about-quad__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(16px, 2vw, 19px);
}

.page-about .about-quad__cell p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-annual {
  margin-top: 12px;
  padding: clamp(20px, 3vw, 30px);
  border: 1px dashed var(--line);
}

.page-about .about-annual__label {
  margin: 0;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--cyan);
}

.page-about .about-annual__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 2.2vw, 21px);
}

.page-about .about-annual p:last-child {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 品牌准则 ---------- */
.page-about .about-principles {
  list-style: none;
  display: grid;
  gap: clamp(16px, 2.4vw, 22px);
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
}

.page-about .about-principles li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .about-principles .mono {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--magenta);
  padding-top: 4px;
}

.page-about .about-principles p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ice);
}

/* ---------- 后续入口 ---------- */
.page-about .about-next {
  margin-top: clamp(48px, 8vw, 96px);
  padding-top: clamp(26px, 4vw, 44px);
  border-top: 1px solid var(--line);
}

.page-about .about-next__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(18px, 2.4vw, 22px);
}

.page-about .about-next__links {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  padding: 0;
}

.page-about .about-next__links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  font-size: 15px;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-about .about-next__links a span {
  color: var(--cyan);
  transition: transform var(--dur) var(--ease);
}

.page-about .about-next__links a:hover {
  color: var(--ice);
  padding-left: 6px;
}

.page-about .about-next__links a:hover span {
  transform: translateX(4px);
}

/* ---------- 页内轨道索引 ---------- */
.page-about .about-rail {
  display: none;
}

.page-about .about-rail ol {
  list-style: none;
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
}

.page-about .about-rail a {
  display: block;
  padding-left: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--mist);
  text-decoration: none;
  border-left: 1px solid var(--line);
  transition: color var(--dur) var(--ease), border-left-color var(--dur) var(--ease);
}

.page-about .about-rail a:hover,
.page-about .about-rail a.is-visible,
.page-about .about-rail a[aria-current] {
  color: var(--cyan);
  border-left-color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 680px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 800px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.4fr);
    align-items: start;
  }

  .page-about .about-timeline {
    padding-left: 24px;
  }

  .page-about .about-timeline::before {
    left: 31px;
  }

  .page-about .about-node {
    padding-left: 68px;
  }

  .page-about .about-node::before {
    left: 24px;
  }

  .page-about .about-timeline__media {
    padding-left: 68px;
  }

  .page-about .about-next__links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 48px);
  }
}

@media (min-width: 1600px) {
  .page-about .about-rail {
    display: block;
    position: fixed;
    top: 50%;
    right: max(20px, calc((100vw - var(--maxw)) / 2 - 152px));
    width: 132px;
    transform: translateY(-50%);
    z-index: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node::before,
  .page-about .about-node__year,
  .page-about .about-next__links a,
  .page-about .about-next__links a span {
    transition: none;
  }
}