.page-about {
  --about-block-gap: clamp(52px, 7vw, 96px);
  --about-row: clamp(26px, 3.6vw, 44px);
  --about-panel-pad: clamp(22px, 3vw, 36px);
}

/* ---------- 面包屑 ---------- */
.page-about .page-about__crumbs {
  padding-top: clamp(18px, 2.6vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  margin-top: clamp(16px, 2.2vw, 26px);
  padding: clamp(40px, 6vw, 84px) 0 clamp(36px, 4.6vw, 64px);
  background:
    radial-gradient(110% 85% at 84% -12%, rgba(34, 224, 214, .16), transparent 62%),
    linear-gradient(180deg, var(--panel) 0%, var(--ink) 74%);
  border-top: 1px solid rgba(34, 224, 214, .32);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__wedge {
  position: absolute;
  top: -20%;
  right: -8%;
  width: min(50vw, 540px);
  height: 86%;
  background: linear-gradient(140deg, rgba(27, 32, 80, .88), rgba(6, 48, 46, .18));
  transform: skewY(-6deg);
  border-left: 1px solid var(--line);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-hero h1 {
  margin: 14px 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 5.2vw, 56px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--paper);
  max-width: 15em;
  overflow-wrap: break-word;
}

.page-about .about-hero__hl {
  position: relative;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .about-hero__hl::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: .08em;
  height: .14em;
  background: linear-gradient(90deg, var(--cyan), rgba(34, 224, 214, 0));
  opacity: .55;
}

.page-about .about-hero .lede {
  margin: 0;
  max-width: 46em;
  font-size: clamp(15px, 1.55vw, 17px);
  line-height: 1.82;
  color: var(--silver);
}

.page-about .about-hero__tags {
  margin-top: 22px;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 3px;
  overflow: hidden;
}

.page-about .about-hero__facts .stat {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 16px 14px 18px;
  background: var(--panel-2);
}

.page-about .about-hero__facts .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(23px, 3vw, 31px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-hero__facts .stat__label {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--grey);
}

/* ---------- 正文骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(30px, 4vw, 56px);
  padding-top: clamp(44px, 6vw, 80px);
  padding-bottom: clamp(56px, 8vw, 104px);
}

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

.page-about .about-toc__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--grey);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-toc__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 10px;
  border-left: 2px solid var(--line);
  color: var(--grey);
  font-size: 13.5px;
  line-height: 1.45;
  text-decoration: none;
  transition: color .25s ease, border-color .25s ease, background-color .25s ease;
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--paper);
  border-left-color: var(--cyan);
  background: rgba(34, 224, 214, .07);
}

.page-about .about-toc__idx {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
  opacity: .85;
}

/* ---------- 章节块 ---------- */
.page-about .about-block {
  padding-top: var(--about-row);
  border-top: 1px solid var(--line);
  scroll-margin-top: 96px;
}

.page-about .about-block + .about-block {
  margin-top: var(--about-block-gap);
}

.page-about .about-block__head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.page-about .about-block__num {
  flex: none;
  padding: 3px 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1;
  letter-spacing: .1em;
  color: var(--cyan);
  border: 1px solid rgba(34, 224, 214, .42);
  border-radius: 2px;
}

.page-about .about-block h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(21px, 2.9vw, 31px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-block p {
  margin: 0 0 16px;
  max-width: 680px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--silver);
}

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

.page-about .about-num {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--cyan);
}

/* ---------- 数据流程四步 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  max-width: 880px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
}

.page-about .about-step {
  position: relative;
  padding: 20px 18px 22px 22px;
  background: linear-gradient(180deg, rgba(6, 48, 46, .58), rgba(11, 18, 32, .94));
  transition: background-color .3s ease;
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 2px;
  background: var(--cyan);
  opacity: .28;
  transition: opacity .3s ease;
}

.page-about .about-step:hover::before,
.page-about .about-step:focus-within::before {
  opacity: 1;
}

.page-about .about-step__idx {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--cyan);
  opacity: .88;
}

.page-about .about-step h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-step p {
  margin: 0;
  max-width: none;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--grey);
}

/* ---------- 图片 ---------- */
.page-about .about-media {
  margin: 28px 0 0;
  max-width: 840px;
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
  background: var(--panel);
}

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

.page-about .about-media figcaption {
  padding: 11px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--grey);
  border-top: 1px solid var(--line);
}

/* ---------- 阵容提示条 ---------- */
.page-about .about-alert {
  margin: 26px 0 0;
  max-width: 680px;
  padding: 18px 20px;
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--cyan);
  border-radius: 3px;
  background: linear-gradient(90deg, rgba(58, 18, 32, .82), rgba(58, 18, 32, .16));
}

.page-about .about-alert__k {
  display: block;
  margin-bottom: 7px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--orange);
}

.page-about .about-alert p {
  margin: 0;
  max-width: none;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--silver);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 14px;
  margin-top: 26px;
  max-width: 920px;
}

.page-about .about-role {
  padding: 20px 18px 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 4px;
  transition: transform .28s ease, border-color .28s ease, box-shadow .28s ease;
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  transform: translateY(-2px);
  border-color: rgba(34, 224, 214, .55);
  box-shadow: 0 12px 28px rgba(0, 0, 0, .4);
}

.page-about .about-role__count {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-role__unit {
  margin-left: 5px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 400;
  color: var(--grey);
}

.page-about .about-role h3 {
  margin: 12px 0 8px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .about-role p {
  margin: 0;
  max-width: none;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--grey);
}

/* ---------- 版本迭代 ---------- */
.page-about .about-iter {
  position: relative;
  overflow: hidden;
  margin-top: 28px;
  max-width: 880px;
  padding: var(--about-panel-pad);
  border: 1px solid var(--line);
  border-radius: 4px;
  background: linear-gradient(152deg, rgba(27, 32, 80, .9) 0%, rgba(11, 18, 32, .96) 64%);
}

.page-about .about-iter::before {
  content: "";
  position: absolute;
  top: -54px;
  right: -68px;
  width: 210px;
  height: 210px;
  background: linear-gradient(135deg, rgba(34, 224, 214, .18), transparent 68%);
  transform: skewX(-6deg);
  pointer-events: none;
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(34, 224, 214, .06) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 26px 34px;
}

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

.page-about .about-timeline__node {
  position: absolute;
  left: 0;
  top: 5px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 2px solid var(--cyan);
  background: var(--ink);
  transition: transform .3s ease, box-shadow .3s ease;
}

.page-about .about-timeline__item:hover .about-timeline__node,
.page-about .about-timeline__item:focus-within .about-timeline__node {
  transform: scale(1.32);
  box-shadow: 0 0 0 4px rgba(34, 224, 214, .16);
}

.page-about .about-timeline__ver {
  margin: 0 0 5px;
  max-width: none;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--orange);
}

.page-about .about-timeline h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-timeline__item p {
  margin: 0;
  max-width: 620px;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--grey);
}

/* ---------- 合作与资质 ---------- */
.page-about .about-split {
  display: grid;
  gap: 18px;
  margin-top: 26px;
}

.page-about .about-panel {
  padding: 22px 20px 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 4px;
}

.page-about .about-panel h3 {
  margin: 0 0 16px;
  padding-bottom: 12px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--paper);
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--silver);
}

.page-about .about-list__n {
  flex: none;
  min-width: 34px;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  color: var(--cyan);
}

.page-about .about-meta {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 15px;
}

.page-about .about-meta li {
  display: grid;
  gap: 5px;
}

.page-about .about-meta__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--grey);
  text-transform: uppercase;
}

.page-about .about-meta__v {
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--paper);
  overflow-wrap: break-word;
  word-break: break-word;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  margin-top: var(--about-block-gap);
  padding-top: var(--about-row);
  border-top: 1px solid var(--line);
  scroll-margin-top: 96px;
}

.page-about .about-next__list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
}

.page-about .about-next__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 16px;
  background: var(--panel);
  color: var(--silver);
  font-size: 15px;
  line-height: 1.5;
  text-decoration: none;
  transition: background-color .25s ease, color .25s ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: rgba(34, 224, 214, .08);
  color: var(--paper);
}

.page-about .about-next__arrow {
  flex: none;
  font-family: var(--font-mono);
  color: var(--cyan);
  transition: transform .25s ease;
}

.page-about .about-next__link:hover .about-next__arrow,
.page-about .about-next__link:focus-visible .about-next__arrow {
  transform: translateX(4px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 780px) {
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-next__link {
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 10px;
    padding: 20px 18px;
  }
}

@media (min-width: 800px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 24px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: clamp(32px, 4vw, 64px);
  }

  .page-about .about-hero__facts {
    margin-top: 34px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1200px) {
  .page-about .about-body {
    grid-template-columns: 212px minmax(0, 1fr);
    gap: clamp(40px, 5vw, 72px);
  }

  .page-about .about-toc {
    display: block;
    position: sticky;
    top: 40px;
    align-self: start;
  }
}