.page-about {
  --about-measure: 68ch;
  --about-gutter: clamp(20px, 4vw, 56px);
  background: var(--ink-900);
  color: var(--white);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  padding-top: clamp(16px, 3vw, 28px);
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .breadcrumb-item a {
  color: var(--mist);
  text-decoration: none;
}

.page-about .breadcrumb-item a:hover {
  color: var(--cyan);
}

.page-about .breadcrumb-item[aria-current="page"] {
  color: var(--cyan);
}

/* ---------- 封面 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 5vw, 56px) 0 clamp(32px, 5vw, 64px);
  background-image:
    radial-gradient(680px 420px at 10% 0%, rgba(34, 230, 210, 0.13), transparent 70%),
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: auto, 96px 96px, 96px 96px;
  border-bottom: 1px solid var(--hairline);
}

.page-about .about-hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
}

.page-about .about-hero-main {
  min-width: 0;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
  margin: 0;
  text-transform: uppercase;
}

.page-about .about-title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(36px, 6vw, 84px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 18px 0 0;
  word-break: break-word;
}

.page-about .about-title-mark {
  color: var(--cyan);
  border-bottom: 3px solid rgba(34, 230, 210, 0.45);
  padding-bottom: 2px;
}

.page-about .about-lede {
  max-width: 46ch;
  margin: clamp(20px, 3vw, 30px) 0 0;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero-panel {
  align-self: end;
  min-width: 0;
  padding: clamp(20px, 3vw, 30px);
  background: linear-gradient(160deg, rgba(7, 43, 69, 0.95), rgba(11, 15, 20, 0.92));
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
}

.page-about .about-panel-label {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

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

.page-about .about-figure {
  padding: 14px 0 12px;
  border-top: 1px solid var(--grid-line);
}

.page-about .about-figure dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
  margin-bottom: 6px;
}

.page-about .about-figure dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.page-about .about-figure-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1;
  color: var(--white);
}

.page-about .about-figure-unit {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mist);
}

/* ---------- 主体骨架 ---------- */

.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
  padding: clamp(32px, 5vw, 72px) 0 clamp(48px, 7vw, 96px);
}

.page-about .about-index {
  display: flex;
  gap: 8px;
  align-items: stretch;
  padding: 10px 0;
  position: sticky;
  top: 60px;
  z-index: 4;
  background: var(--ink-900);
  border-bottom: 1px solid var(--grid-line);
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-index-link {
  flex: 0 0 auto;
  display: flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
  text-decoration: none;
  border: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .about-index-link:hover,
.page-about .about-index-link[aria-current="true"] {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-index-num {
  color: var(--cyan);
}

.page-about .about-index-label {
  color: inherit;
}

/* ---------- 章节 ---------- */

.page-about .about-sec {
  padding-bottom: clamp(32px, 5vw, 64px);
  margin-bottom: clamp(32px, 5vw, 64px);
  border-bottom: 1px solid var(--grid-line);
  scroll-margin-top: 130px;
}

.page-about .about-sec:last-of-type {
  border-bottom: 0;
  margin-bottom: clamp(24px, 4vw, 48px);
}

.page-about .about-sec-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3vw, 34px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  color: var(--white);
}

.page-about .about-sec p {
  max-width: var(--about-measure);
  font-size: 16px;
  line-height: 1.85;
  color: rgba(244, 248, 251, 0.82);
  margin: 0 0 16px;
}

.page-about .about-lead {
  font-size: clamp(16px, 1.8vw, 18px) !important;
  line-height: 1.8 !important;
  color: var(--white) !important;
  padding-left: 16px;
  border-left: 2px solid var(--cyan);
}

.page-about .text-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 230, 210, 0.4);
  padding-bottom: 1px;
  transition: border-color 0.18s ease, color 0.18s ease;
}

.page-about .text-link:hover {
  border-bottom-width: 2px;
  border-color: var(--cyan);
}

/* 指标带 */

.page-about .about-metrics {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: clamp(20px, 3vw, 32px) 0 clamp(20px, 3vw, 32px);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.page-about .about-metric {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 0;
  border-bottom: 1px solid var(--grid-line);
}

.page-about .about-metric:last-child {
  border-bottom: 0;
}

.page-about .about-metric-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(28px, 4.4vw, 46px);
  line-height: 1;
  color: var(--cyan);
  flex: 0 0 auto;
}

.page-about .about-metric-label {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* 工序 */

.page-about .about-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: clamp(20px, 3vw, 30px) 0 clamp(24px, 4vw, 36px);
  padding: 0;
  list-style: none;
}

.page-about .about-step {
  position: relative;
  padding: 20px 20px 20px 22px;
  background: rgba(7, 43, 69, 0.55);
  border: 1px solid var(--line);
  border-left: 2px solid var(--blue-500);
  transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-step:hover {
  border-color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(20, 86, 127, 0.45);
  transform: translateY(-2px);
}

.page-about .about-step--focus {
  border-left-color: var(--cyan);
}

.page-about .about-step-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
  margin-bottom: 8px;
}

.page-about .about-step-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: 0.02em;
  margin: 0 0 10px;
  color: var(--white);
}

.page-about .about-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 248, 251, 0.78);
  max-width: none;
}

/* 图片 */

.page-about .about-media {
  margin: clamp(24px, 4vw, 36px) 0;
  padding: 0;
}

.page-about .about-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--blue-900);
}

.page-about .about-media-cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* 团队 */

.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  margin: clamp(20px, 3vw, 32px) 0 clamp(24px, 4vw, 32px);
}

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

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

.page-about .about-role {
  display: flex;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--grid-line);
}

.page-about .about-role-num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-role-name {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 16px;
  margin: 0 0 8px;
  color: var(--white);
}

.page-about .about-role p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 248, 251, 0.76);
  max-width: none;
}

/* 时间轴 */

.page-about .about-sec--timeline {
  position: relative;
}

.page-about .about-timeline {
  position: relative;
  margin: clamp(20px, 3vw, 32px) 0;
  padding: clamp(16px, 2.4vw, 24px) 0;
  overflow: hidden;
}

.page-about .about-timeline-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.22;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-timeline-list {
  position: relative;
  z-index: 1;
  padding-left: 28px;
}

.page-about .about-timeline-list::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(to bottom, var(--cyan), var(--blue-500) 60%, transparent);
}

.page-about .about-node {
  position: relative;
  border-bottom: 1px solid var(--grid-line);
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 20px;
  width: 13px;
  height: 13px;
  background: var(--ink-900);
  border: 1px solid var(--cyan);
  transition: background-color 0.2s ease;
}

.page-about .about-node[open]::before {
  background: var(--cyan);
}

.page-about .about-node-sum {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 18px 30px 18px 0;
  cursor: pointer;
  list-style: none;
  position: relative;
  transition: color 0.18s ease;
}

.page-about .about-node-sum::-webkit-details-marker {
  display: none;
}

.page-about .about-node-sum::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 16px;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-node[open] .about-node-sum::after {
  content: "−";
}

.page-about .about-node-sum:hover .about-node-title {
  color: var(--cyan);
}

.page-about .about-node-era {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .about-node-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 2vw, 21px);
  letter-spacing: -0.01em;
  color: var(--white);
  transition: color 0.18s ease;
}

.page-about .about-node-body {
  padding: 0 30px 20px 0;
}

.page-about .about-node-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 248, 251, 0.78);
  max-width: 62ch;
}

/* 原则 */

.page-about .about-principles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-principle {
  display: block;
  padding: clamp(20px, 3vw, 30px);
  text-decoration: none;
  background: rgba(7, 43, 69, 0.4);
  border: 1px solid var(--line);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-principle:hover {
  border-color: var(--cyan);
  background: rgba(20, 86, 127, 0.4);
}

.page-about .about-principle-kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mist);
  margin-bottom: 14px;
}

.page-about .about-principle-line {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--white);
  margin: 0 0 14px !important;
  max-width: 24ch !important;
}

.page-about .about-principle-text {
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 248, 251, 0.74);
  margin: 0 0 18px !important;
  max-width: 56ch !important;
}

.page-about .about-principle-go {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  border-bottom: 1px solid rgba(34, 230, 210, 0.45);
  padding-bottom: 3px;
}

/* 收尾 */

.page-about .about-cta {
  padding: clamp(24px, 4vw, 40px) 0 0;
  border-top: 1px solid var(--hairline);
}

.page-about .about-cta-text {
  max-width: 58ch;
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

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

.page-about .about-cta-actions .btn {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  font-size: 14px;
  letter-spacing: 0.06em;
  border-radius: var(--radius);
}

.page-about .about-cta-actions .btn--primary {
  background: var(--orange);
  color: #0B0F14;
  border: 1px solid var(--orange);
}

.page-about .about-cta-actions .btn--primary:hover {
  filter: brightness(1.08);
}

.page-about .about-cta-actions .btn--ghost {
  background: transparent;
  color: var(--white);
  border: 1px solid var(--line);
}

.page-about .about-cta-actions .btn--ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

/* ---------- 断点 ---------- */

@media (min-width: 600px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-metric {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 18px 18px 18px 0;
    border-bottom: 0;
    border-right: 1px solid var(--grid-line);
  }

  .page-about .about-metric:last-child {
    border-right: 0;
  }

  .page-about .about-metric:nth-child(3n) {
    border-right: 0;
  }

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

  .page-about .about-principles {
    gap: 16px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-media--team {
    position: sticky;
    top: 120px;
  }

  .page-about .about-media--team img {
    aspect-ratio: 14 / 9;
  }
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
  }

  .page-about .about-index {
    position: sticky;
    top: 108px;
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
    padding: 0;
    border-bottom: 0;
    background: none;
    overflow: visible;
    z-index: 1;
  }

  .page-about .about-index-link {
    writing-mode: vertical-rl;
    padding: 0 0 0 8px;
    border: 0;
    border-left: 1px solid transparent;
    letter-spacing: 0.24em;
  }

  .page-about .about-index-link:hover,
  .page-about .about-index-link[aria-current="true"] {
    border-left: 2px solid var(--cyan);
    border-color: var(--cyan);
  }

  .page-about .about-index-num {
    letter-spacing: 0.2em;
  }

  .page-about .about-sec {
    scroll-margin-top: 100px;
  }

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

  .page-about .about-cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
  }

  .page-about .about-cta-text {
    margin-bottom: 0;
  }

  .page-about .about-cta-actions {
    flex: 0 0 auto;
  }
}

@media (min-width: 1280px) {
  .page-about .about-principle-line {
    max-width: 20ch !important;
  }
}
<<<END>>>