.page-about {
  --about-rail: 2px;
  --about-dot: 16px;
  --about-board-border: 2px solid var(--grid);
  --about-board-shadow: 8px 8px 0 rgba(11, 31, 26, 0.9);
  background: var(--ink-900);
  color: var(--text);
  overflow-x: hidden;
}

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

.page-about .about-crumbs {
  padding-top: clamp(14px, 2.4vw, 22px);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .about-crumbs a {
  color: var(--cyan-300);
  text-decoration: none;
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--cyan-500);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 56px) 0 clamp(30px, 5vw, 60px);
  border-bottom: 1px solid var(--grid);
  background: linear-gradient(158deg, var(--ink-800) 0%, var(--ink-900) 64%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -60px;
  right: -12%;
  width: min(600px, 78vw);
  height: 340px;
  background: var(--ink-700);
  clip-path: polygon(20% 0, 100% 0, 100% 74%, 0 100%);
  opacity: 0.85;
  pointer-events: none;
}

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

.page-about .about-hero__kicker {
  color: var(--cyan-300);
  margin: 0 0 18px;
}

.page-about .about-hero h1 {
  margin: 0;
  max-width: 15em;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(32px, 6.4vw, 68px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  margin: clamp(18px, 3vw, 26px) 0 0;
  max-width: 38ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--text);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 5vw, 44px) 0 0;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .about-hero__stat {
  background: var(--ink-800);
  padding: 16px 16px 18px;
}

.page-about .about-hero__stat dt {
  margin: 0 0 8px;
  color: var(--muted);
}

.page-about .about-hero__value {
  margin: 0;
  font-size: clamp(26px, 4.6vw, 38px);
  font-weight: 500;
  line-height: 1;
  color: var(--cyan-500);
}

.page-about .about-hero__unit {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 章节跳转条 ---------- */
.page-about .about-jump {
  position: sticky;
  top: var(--bsp-header-h);
  z-index: 6;
  background: rgba(5, 19, 15, 0.94);
  border-bottom: 1px solid var(--grid);
  backdrop-filter: blur(6px);
}

.page-about .about-jump__inner {
  display: flex;
  gap: 6px;
  padding-top: 10px;
  padding-bottom: 10px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-jump__inner::-webkit-scrollbar {
  display: none;
}

.page-about .about-jump__link {
  flex: 0 0 auto;
  padding: 7px 14px;
  border: 1px solid var(--grid);
  border-radius: 999px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--text);
  text-decoration: none;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-jump__link:hover,
.page-about .about-jump__link:focus-visible {
  border-color: var(--cyan-500);
  color: var(--cyan-500);
  background: var(--ink-800);
}

/* ---------- 通用章节头 ---------- */
.page-about .bsp-section {
  padding-block: clamp(44px, 7vw, 92px);
  scroll-margin-top: calc(var(--bsp-header-h) + 56px);
}

.page-about .about-head {
  max-width: 46ch;
}

.page-about .about-head h2 {
  margin: 10px 0 0;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(26px, 4.4vw, 46px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-head__lead {
  margin: 16px 0 0;
  max-width: 40ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.78;
  color: var(--text);
}

/* ---------- 能力路径图 ---------- */
.page-about .about-tree {
  margin: clamp(26px, 4vw, 44px) 0 clamp(12px, 2vw, 20px);
  padding: 14px 10px;
  border: 1px solid var(--grid);
  background: var(--ink-800);
  overflow-x: auto;
}

.page-about .about-tree svg {
  display: block;
  width: 100%;
  min-width: 520px;
  height: auto;
}

.page-about .about-tree__line {
  fill: none;
  stroke: var(--cyan-500);
  stroke-width: 2;
  stroke-linecap: round;
}

.page-about .about-tree__line--dim {
  stroke: var(--grid);
}

.page-about .about-tree__node circle {
  fill: var(--ink-700);
  stroke: var(--cyan-500);
  stroke-width: 2;
}

.page-about .about-tree__node--now circle {
  fill: var(--cyan-500);
  stroke: var(--cyan-300);
}

.page-about .about-tree__node text {
  fill: var(--muted);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.page-about .about-tree__node--now text {
  fill: var(--cyan-300);
}

/* ---------- 时间轨道 ---------- */
.page-about .about-track {
  position: relative;
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: var(--about-rail);
  background: linear-gradient(180deg, var(--cyan-500) 0%, var(--cyan-500) 18%, var(--grid) 46%, var(--grid) 100%);
}

.page-about .about-stages {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 2.6vw, 30px);
}

.page-about .about-stage {
  position: relative;
  padding-left: 32px;
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: var(--about-dot);
  height: var(--about-dot);
  border-radius: 50%;
  background: var(--cyan-500);
  box-shadow: 0 0 0 4px rgba(43, 245, 200, 0.14);
}

.page-about .about-stage__year {
  margin: 0 0 10px;
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--cyan-500);
}

.page-about .about-stage__board {
  border: var(--about-board-border);
  background: var(--ink-800);
  border-radius: var(--radius);
  padding: clamp(18px, 2.6vw, 28px) clamp(16px, 2.2vw, 26px);
  box-shadow: var(--about-board-shadow);
}

.page-about .about-stage__board h3 {
  margin: 0 0 12px;
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-stage__board p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text);
  max-width: 42ch;
}

.page-about .about-stage__figure {
  max-width: 280px;
  margin: 20px 0 0;
}

.page-about .about-stage__figure .bsp-figure__caption {
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 双线 tabs ---------- */
.page-about .about-lines {
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-lines__list {
  position: relative;
  display: flex;
  gap: 8px;
  border-bottom: 1px solid var(--grid);
  padding-bottom: 0;
}

.page-about .about-lines__tab {
  appearance: none;
  background: none;
  border: 0;
  padding: 12px 18px 14px;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--muted);
  cursor: pointer;
  border-radius: var(--radius) var(--radius) 0 0;
}

.page-about .about-lines__tab[aria-selected="true"] {
  color: var(--cyan-500);
  background: var(--ink-800);
}

.page-about .about-lines__tab:focus-visible {
  outline: 2px solid var(--cyan-500);
  outline-offset: -2px;
}

.page-about .about-lines__ink {
  position: absolute;
  left: 0;
  bottom: 0;
  height: 3px;
  width: 0;
  background: var(--cyan-500);
  transition: transform 0.24s ease, width 0.24s ease;
}

.page-about .about-lines__panel {
  padding: clamp(20px, 3vw, 32px) 0 0;
}

.page-about .about-lines__panel h3 {
  margin: 0 0 16px;
  font-size: clamp(19px, 2.4vw, 24px);
  font-weight: 700;
  color: var(--paper);
}

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

.page-about .about-lines__list-items li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text);
  max-width: 56ch;
}

.page-about .about-lines__list-items li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  background: var(--cyan-500);
}

/* ---------- 团队 ---------- */
.page-about .about-team__layout {
  display: grid;
  gap: clamp(22px, 3vw, 32px);
  margin-top: clamp(24px, 4vw, 40px);
}

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

.page-about .about-team__figure .bsp-figure__media img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-team__figure .bsp-figure__caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-team__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .about-team__card {
  background: var(--ink-800);
  padding: 20px 18px 22px;
  transition: background-color 0.2s ease;
}

.page-about .about-team__card:hover,
.page-about .about-team__card:focus-within,
.page-about .about-team__card:focus-visible {
  background: var(--ink-700);
}

.page-about .about-team__card:focus-visible {
  outline: 2px solid var(--cyan-500);
  outline-offset: -2px;
}

.page-about .about-team__no {
  margin: 0 0 10px;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--cyan-300);
}

.page-about .about-team__card h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-team__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--text);
}

.page-about .about-team__note {
  color: var(--muted) !important;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.24s ease, opacity 0.24s ease, margin-top 0.24s ease;
}

.page-about .about-team__card:hover .about-team__note,
.page-about .about-team__card:focus-within .about-team__note,
.page-about .about-team__card:focus-visible .about-team__note {
  max-height: 90px;
  opacity: 1;
  margin-top: 10px;
}

/* ---------- 来源 ---------- */
.page-about .about-sources__list {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .about-sources__item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  background: var(--ink-800);
  padding: 18px 16px;
}

.page-about .about-sources__no {
  margin: 2px 0 0;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--cyan-500);
}

.page-about .about-sources__item h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .about-sources__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--text);
  max-width: 52ch;
}

/* ---------- 长期投入 ---------- */
.page-about .about-lasting__figure {
  margin: 0 0 clamp(24px, 3.4vw, 36px);
}

.page-about .about-lasting__figure .bsp-figure__media img {
  width: 100%;
  height: clamp(160px, 26vw, 320px);
  object-fit: cover;
}

.page-about .about-lasting__figure .bsp-figure__caption {
  margin-top: 10px;
  font-size: 12px;
  color: var(--muted);
}

.page-about .about-lasting__quote {
  background: var(--paper);
  color: var(--ink-900);
  border: 2px solid var(--paper);
  border-radius: var(--radius);
  padding: clamp(22px, 3.4vw, 36px);
  box-shadow: 10px 10px 0 rgba(27, 48, 42, 0.9);
}

.page-about .about-lasting__quote-label {
  margin: 0 0 14px;
  color: var(--ink-700);
}

.page-about .about-lasting__line {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(21px, 3.4vw, 34px);
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--ink-900);
  max-width: 22ch;
}

.page-about .about-lasting__list {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 2.4vw, 26px);
}

.page-about .about-lasting__item {
  border-top: 1px solid var(--grid);
  padding-top: 16px;
}

.page-about .about-lasting__item h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--cyan-300);
  letter-spacing: 0.02em;
}

.page-about .about-lasting__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--text);
  max-width: 40ch;
}

/* ---------- 继续看 ---------- */
.page-about .about-next__grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-next__card {
  display: block;
  padding: clamp(20px, 3vw, 30px);
  border: 2px solid var(--grid);
  border-radius: var(--radius);
  background: var(--ink-800);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s ease, transform 0.2s ease, background-color 0.2s ease;
}

.page-about .about-next__card--alt {
  background: var(--ink-700);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  border-color: var(--cyan-500);
  transform: translateY(-3px);
}

.page-about .about-next__card:focus-visible {
  outline: 2px solid var(--cyan-500);
  outline-offset: 2px;
}

.page-about .about-next__tag {
  margin: 0 0 12px;
  color: var(--cyan-300);
}

.page-about .about-next__card h3 {
  margin: 0 0 10px;
  font-size: clamp(18px, 2.4vw, 24px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-next__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--text);
  max-width: 40ch;
}

.page-about .about-next__go {
  display: inline-block;
  margin-top: 16px;
  padding-bottom: 3px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--cyan-500);
  border-bottom: 2px solid var(--cyan-500);
}

.page-about .about-next__help {
  margin: clamp(22px, 3vw, 32px) 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-next__help a {
  color: var(--cyan-300);
  text-decoration: none;
  border-bottom: 1px solid var(--grid);
}

.page-about .about-next__help a:hover,
.page-about .about-next__help a:focus-visible {
  color: var(--cyan-500);
  border-bottom-color: var(--cyan-500);
}

/* ---------- 平板以上 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .about-lasting__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .about-sources__item {
    grid-template-columns: 60px minmax(0, 1fr);
    padding: 22px 24px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 980px) {
  .page-about .about-hero__inner {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: end;
  }

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

  .page-about .about-track {
    padding-left: 46px;
  }

  .page-about .about-track::before {
    left: 13px;
  }

  .page-about .about-stage {
    display: grid;
    grid-template-columns: 116px minmax(0, 1fr);
    gap: clamp(16px, 2vw, 28px);
    padding-left: 0;
  }

  .page-about .about-stage::before {
    left: 7px;
    top: 22px;
  }

  .page-about .about-stage__year {
    margin: 10px 0 0;
    text-align: right;
    font-size: 22px;
  }

  .page-about .about-stage:nth-child(even) .about-stage__board {
    margin-left: clamp(0px, 2.4vw, 32px);
  }

  .page-about .about-stage__board {
    max-width: 62ch;
  }

  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
    gap: clamp(24px, 3.4vw, 44px);
  }

  .page-about .about-team__figure {
    position: sticky;
    top: calc(var(--bsp-header-h) + 80px);
  }

  .page-about .about-lasting__quote {
    max-width: 34ch;
  }

  .page-about .about-next__card {
    padding: clamp(24px, 3vw, 36px);
  }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-jump__link,
  .page-about .about-team__card,
  .page-about .about-team__note,
  .page-about .about-lines__ink,
  .page-about .about-next__card {
    transition: none;
  }

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

  .page-about .about-team__note {
    max-height: none;
    opacity: 1;
    margin-top: 10px;
  }
}
<<<PAGE_CSS_END>>>