.page-about {
  --ab-pad: clamp(16px, 4vw, 40px);
  --ab-gap: clamp(22px, 4vw, 44px);
  --ab-card: rgba(16, 46, 68, 0.9);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(20px, 4vw, 34px) 0 clamp(38px, 6vw, 72px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(85% 130% at 0% 0%, rgba(122, 108, 255, 0.34) 0%, rgba(7, 26, 43, 0) 58%),
    radial-gradient(72% 110% at 100% 0%, rgba(25, 195, 125, 0.26) 0%, rgba(7, 26, 43, 0) 62%),
    var(--ink);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(169, 188, 198, 0.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(169, 188, 198, 0.09) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.3) 58%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.3) 58%, transparent 100%);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6.4vw, 76px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .about-hero h1 em {
  font-style: normal;
  color: var(--lime);
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 64ch;
  font-size: clamp(15.5px, 1.5vw, 18px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  overflow: hidden;
}

.page-about .about-stats > div {
  background: rgba(16, 46, 68, 0.88);
  padding: 15px 16px 17px;
}

.page-about .about-stats dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .about-stats dd {
  margin: 7px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.8vw, 28px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--lime);
}

.page-about .about-stats dd small {
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--mist);
  margin-left: 4px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

/* ---------- 左轨布局 ---------- */
.page-about .about-rail {
  padding-block: clamp(32px, 5vw, 64px);
  gap: clamp(22px, 4vw, 52px);
}

.page-about .about-index {
  align-self: start;
  min-width: 0;
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--mist);
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 12px 0 2px;
  list-style: none;
  overflow-x: auto;
  border-top: 1px solid var(--line);
  scrollbar-width: thin;
}

.page-about .about-index__list li {
  flex: 0 0 auto;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  min-height: 40px;
  padding: 9px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.3s var(--ease), border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--paper);
  border-color: var(--green);
  background: rgba(25, 195, 125, 0.12);
}

.page-about .about-index__code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mint);
}

.page-about .about-body {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
  min-width: 0;
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  position: relative;
  padding-top: clamp(28px, 4vw, 44px);
  border-top: 1px solid var(--line);
  scroll-margin-top: 130px;
  min-width: 0;
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec__code {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--mint);
}

.page-about .about-sec__code span {
  display: inline-grid;
  place-items: center;
  min-width: 30px;
  height: 22px;
  padding: 0 6px;
  border-radius: 999px;
  background: rgba(111, 255, 210, 0.16);
  letter-spacing: 0.06em;
  color: var(--mint);
}

.page-about .about-sec h2 {
  margin: 12px 0 0;
  max-width: 26ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 4.2vw, 44px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .about-sec h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-sec p {
  margin: 13px 0 0;
  max-width: 70ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-sec a {
  color: var(--mint);
  text-decoration-color: rgba(111, 255, 210, 0.45);
  text-underline-offset: 3px;
}

.page-about .about-sec a:hover,
.page-about .about-sec a:focus-visible {
  color: var(--lime);
}

/* ---------- 图组 ---------- */
.page-about .about-figure {
  position: relative;
  margin: 0;
  border-radius: var(--r-m);
  border: 1px solid var(--line-strong);
  background: var(--ink-2);
  overflow: hidden;
}

.page-about .about-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(111, 255, 210, 0.11) 1px, transparent 1px),
    linear-gradient(90deg, rgba(111, 255, 210, 0.11) 1px, transparent 1px);
  background-size: 46px 46px;
  mix-blend-mode: screen;
}

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

.page-about .about-figure figcaption {
  padding: 10px 15px 12px;
  border-top: 1px solid var(--line);
  background: rgba(7, 26, 43, 0.72);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-figure--wide {
  margin-top: clamp(20px, 3vw, 30px);
}

/* ---------- 起点分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-split__text p:first-child {
  margin-top: 0;
}

/* ---------- 三条内容线 ---------- */
.page-about .about-lines {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-lines__item {
  position: relative;
  padding: 20px 20px 22px;
  border-radius: var(--r-m);
  border: 1px solid var(--line);
  background: linear-gradient(158deg, rgba(16, 46, 68, 0.95), rgba(7, 26, 43, 0.95));
  overflow: hidden;
  transition: border-color 0.4s var(--ease), transform 0.4s var(--ease);
}

.page-about .about-lines__item::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--green), var(--mint));
}

.page-about .about-lines__item:nth-child(2)::before {
  background: linear-gradient(90deg, var(--cyan), var(--violet));
}

.page-about .about-lines__item:nth-child(3)::before {
  background: linear-gradient(90deg, var(--lime), var(--green));
}

.page-about .about-lines__item:hover {
  border-color: var(--line-strong);
}

.page-about .about-lines__code {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-about .about-lines__item h3 {
  margin: 10px 0 8px;
}

.page-about .about-lines__item p {
  margin: 0;
  max-width: none;
  font-size: 14.5px;
  line-height: 1.75;
}

/* ---------- 编辑流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-flow__step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px dashed var(--line);
}

.page-about .about-flow__step:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-flow__num {
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--cyan);
}

.page-about .about-flow__step p {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
}

/* ---------- 发展轨道 ---------- */
.page-about .about-track {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0 0 14px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(238px, 258px);
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  overscroll-behavior-inline: contain;
  scrollbar-width: thin;
}

.page-about .about-track__node {
  position: relative;
  padding: 18px 18px 20px;
  border-radius: var(--r-m);
  border: 1px solid var(--line);
  border-top: 3px solid var(--violet);
  background: var(--ab-card);
  scroll-snap-align: start;
}

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

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

.page-about .about-track__node:nth-child(4) {
  border-top-color: var(--lime);
}

.page-about .about-track__year {
  font-family: var(--font-mono);
  font-size: 25px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--lime);
}

.page-about .about-track__node h3 {
  margin: 8px 0 6px;
  font-size: 16.5px;
  line-height: 1.4;
}

.page-about .about-track__node p {
  margin: 0;
  max-width: none;
  font-size: 14px;
  line-height: 1.7;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-team__row {
  display: grid;
  gap: 10px;
  padding: 16px 18px 18px;
  border-radius: var(--r-m);
  border: 1px solid var(--line);
  background: rgba(16, 46, 68, 0.55);
  transition: border-color 0.35s var(--ease), background 0.35s var(--ease);
}

.page-about .about-team__row:hover,
.page-about .about-team__row:focus-within {
  border-color: var(--line-strong);
  background: rgba(16, 46, 68, 0.96);
}

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

.page-about .about-team__name {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-team__count {
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--lime);
}

.page-about .about-team__bar {
  height: 6px;
  border-radius: 999px;
  background: rgba(169, 188, 198, 0.18);
  overflow: hidden;
}

.page-about .about-team__bar > span {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--green), var(--mint));
}

.page-about .about-team__row:nth-child(1) .about-team__bar > span { width: 100%; }
.page-about .about-team__row:nth-child(2) .about-team__bar > span { width: 66.7%; }
.page-about .about-team__row:nth-child(3) .about-team__bar > span { width: 50%; }
.page-about .about-team__row:nth-child(4) .about-team__bar > span { width: 33.3%; }

.page-about .about-team__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 合作索引 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  max-width: 720px;
}

.page-about .about-partners__item {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0 18px;
  border-top: 1px solid var(--line);
}

.page-about .about-partners__item:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-partners__code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  line-height: 1.9;
  color: var(--cyan);
}

.page-about .about-partners__item h3 {
  font-size: 16.5px;
  margin-bottom: 6px;
}

.page-about .about-partners__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  display: grid;
  gap: 14px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-next__card {
  display: block;
  padding: 22px 22px 24px;
  border-radius: var(--r-m);
  border: 1px solid var(--line-strong);
  background: linear-gradient(152deg, rgba(25, 195, 125, 0.16), rgba(7, 26, 43, 0.94) 62%);
  color: var(--paper);
  text-decoration: none;
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease);
}

.page-about .about-next__card:nth-child(2) {
  background: linear-gradient(152deg, rgba(54, 214, 231, 0.16), rgba(7, 26, 43, 0.94) 62%);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--green);
}

.page-about .about-next__code {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--lime);
}

.page-about .about-next__card h3 {
  margin: 10px 0 8px;
  font-size: 19px;
}

.page-about .about-next__card p {
  margin: 0;
  max-width: 40ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-next__note {
  margin-top: clamp(18px, 2.6vw, 26px);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 68ch;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-stats > div {
    padding: 17px 18px 19px;
  }
}

@media (min-width: 760px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-lines {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    padding-bottom: 34px;
  }

  .page-about .about-lines__item:nth-child(2) {
    transform: translateY(16px);
  }

  .page-about .about-lines__item:nth-child(3) {
    transform: translateY(32px);
  }

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

@media (min-width: 820px) {
  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
    border-radius: var(--r-m);
    overflow: hidden;
  }

  .page-about .about-flow__step {
    display: block;
    padding: 22px 22px 26px;
    border-top: 0;
    background: var(--ink-2);
  }

  .page-about .about-flow__step:first-child {
    padding-top: 22px;
  }

  .page-about .about-flow__num {
    display: block;
    margin-bottom: 10px;
  }
}

@media (min-width: 900px) {
  .page-about .about-track {
    grid-auto-flow: row;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    grid-auto-columns: auto;
    overflow-x: visible;
    padding-bottom: 0;
  }

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

@media (min-width: 980px) {
  .page-about .about-index {
    position: sticky;
    top: 116px;
  }

  .page-about .about-index__list {
    display: block;
    overflow: visible;
    padding: 0;
    border-top: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-index__list li {
    flex: none;
  }

  .page-about .about-index__link {
    display: flex;
    align-items: baseline;
    gap: 10px;
    min-height: 0;
    padding: 9px 0 9px 14px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    margin-left: -1px;
    white-space: normal;
    background: none;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    border-left-color: var(--green);
    background: none;
  }
}

@media (min-width: 1080px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  .page-about .about-lines__item:nth-child(2),
  .page-about .about-lines__item:nth-child(3),
  .page-about .about-next__card:hover,
  .page-about .about-next__card:focus-visible {
    transform: none;
  }
}