.page-about {
  --pa-line: rgba(244, 241, 234, 0.14);
  --pa-line-strong: rgba(244, 241, 234, 0.24);
  --pa-dim: rgba(244, 241, 234, 0.68);
  --pa-dimmer: rgba(244, 241, 234, 0.5);
  background-color: var(--deep-sea);
  color: var(--paper);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about .section-title {
  font-family: var(--font-display);
  font-size: var(--step-2);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 10px 0 14px;
}

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

.page-about .about-head__note {
  margin: 0;
  color: var(--pa-dim);
  font-size: 1rem;
  line-height: 1.8;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--pa-line);
  background:
    radial-gradient(880px 420px at 86% -12%, rgba(0, 229, 176, 0.16), transparent 62%),
    radial-gradient(620px 380px at 6% 108%, rgba(217, 164, 65, 0.12), transparent 65%),
    linear-gradient(180deg, var(--midnight), var(--deep-sea) 72%);
  padding-block: clamp(36px, 5vw, 64px) clamp(48px, 7vw, 104px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(244, 241, 234, 0.055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(244, 241, 234, 0.055) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 88%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 88%);
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  margin-top: clamp(26px, 4vw, 52px);
}

.page-about .about-hero__lead h1 {
  font-family: var(--font-display);
  font-size: var(--step-3);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.015em;
  margin: 12px 0 20px;
  color: var(--paper);
  max-width: 18ch;
}

.page-about .about-hero__intro {
  margin: 0;
  max-width: var(--measure);
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--pa-dim);
}

.page-about .about-hero__actions {
  margin-top: 28px;
}

.page-about .about-facts {
  border: 1px solid var(--pa-line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(27, 31, 75, 0.62), rgba(10, 37, 64, 0.78));
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  padding: clamp(18px, 2.4vw, 26px);
}

.page-about .facts-list {
  margin: 14px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--pa-line);
  border: 1px solid var(--pa-line);
}

.page-about .fact {
  background: rgba(10, 37, 64, 0.82);
  padding: 14px 14px 16px;
}

.page-about .fact dt {
  font-size: var(--step--1);
  color: var(--pa-dimmer);
  letter-spacing: 0.02em;
}

.page-about .fact dd {
  margin: 8px 0 0;
  display: flex;
  align-items: baseline;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 2.4vw, 1.85rem);
  line-height: 1;
  color: var(--sand);
}

.page-about .fact .unit {
  font-family: var(--font-body);
  font-size: 0.78rem;
  color: var(--pa-dimmer);
}

/* ---------- 时间轴 ---------- */

.page-about .about-origin {
  background: linear-gradient(180deg, var(--deep-sea), var(--midnight) 120%);
  padding-block: clamp(52px, 7vw, 112px);
}

.page-about .origin-grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  margin-top: clamp(26px, 3.6vw, 46px);
}

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

.page-about .tl-item {
  position: relative;
  padding-left: 28px;
  padding-bottom: 24px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 16px;
  bottom: 0;
  width: 1px;
  background: var(--pa-line-strong);
}

.page-about .tl-item:last-child::before {
  bottom: auto;
  height: 20px;
}

.page-about .tl-item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--deep-sea);
  border: 2px solid var(--neon);
}

.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  letter-spacing: 0.12em;
  color: var(--sand);
}

.page-about .tl-body {
  margin-top: 6px;
  border: 1px solid var(--pa-line);
  border-radius: var(--radius);
  background: rgba(244, 241, 234, 0.05);
  padding: 16px 18px 18px;
  transition: border-color var(--dur) var(--spring), transform var(--dur) var(--spring);
}

.page-about .tl-body:hover {
  border-color: rgba(0, 229, 176, 0.4);
  transform: translateY(-2px);
}

.page-about .tl-title {
  margin: 0 0 8px;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .tl-body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--pa-dim);
}

.page-about .media-frame {
  margin: 0;
  border: 1px solid var(--pa-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: rgba(27, 31, 75, 0.4);
}

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

.page-about .media-frame figcaption {
  padding: 10px 14px 12px;
  border-top: 1px solid var(--pa-line);
  font-size: var(--step--1);
  line-height: 1.6;
  color: var(--pa-dimmer);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  background: var(--midnight);
  padding-block: clamp(52px, 7vw, 112px);
}

.page-about .about-split {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
}

.page-about .about-split__lead p {
  margin: 0;
  max-width: var(--measure);
  color: var(--pa-dim);
}

.page-about .role-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .role-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px 16px;
}

.page-about .role-name {
  font-size: 0.9375rem;
  color: var(--paper);
}

.page-about .role-count {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--sand);
  white-space: nowrap;
}

.page-about .role-bar {
  grid-column: 1 / -1;
  position: relative;
  display: block;
  height: 6px;
  background: rgba(244, 241, 234, 0.1);
  overflow: hidden;
}

.page-about .role-bar::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: var(--w, 50%);
  background: linear-gradient(90deg, var(--neon), rgba(0, 229, 176, 0.28));
}

.page-about .role-row:nth-child(1) { --w: 100%; }
.page-about .role-row:nth-child(2) { --w: 29%; }
.page-about .role-row:nth-child(3) { --w: 26%; }

.page-about .role-note {
  margin: 24px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--pa-line);
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--pa-dim);
}

/* ---------- 校对节奏 ---------- */

.page-about .about-quality {
  background:
    radial-gradient(700px 340px at 92% 0%, rgba(0, 229, 176, 0.12), transparent 62%),
    var(--teal);
  padding-block: clamp(52px, 7vw, 112px);
}

.page-about .quality-grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  margin-top: clamp(24px, 3.4vw, 42px);
}

.page-about .check-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .check-steps li {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--pa-line);
}

.page-about .check-steps li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .check-idx {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  color: var(--neon);
  line-height: 1.6;
}

.page-about .check-steps h3 {
  margin: 0 0 6px;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .check-steps p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.82;
  color: var(--pa-dim);
}

.page-about .quality-metrics {
  margin-top: clamp(30px, 4vw, 52px);
  display: grid;
  gap: 1px;
  background: var(--pa-line);
  border: 1px solid var(--pa-line);
}

.page-about .metric {
  background: rgba(10, 37, 64, 0.5);
  padding: 20px 20px 22px;
}

.page-about .metric-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  line-height: 1;
  color: var(--neon);
}

.page-about .metric-unit {
  display: block;
  margin-top: 8px;
  font-size: var(--step--1);
  letter-spacing: 0.08em;
  color: var(--sand);
}

.page-about .metric p {
  margin: 12px 0 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--pa-dimmer);
}

/* ---------- 协作生态 ---------- */

.page-about .about-network {
  background:
    radial-gradient(760px 360px at 10% 0%, rgba(10, 37, 64, 0.55), transparent 66%),
    var(--wine);
  padding-block: clamp(52px, 7vw, 112px);
}

.page-about .about-network .section-title {
  max-width: 22ch;
}

.page-about .network-band {
  margin-top: clamp(26px, 3.6vw, 44px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(244, 241, 234, 0.22);
  border: 1px solid rgba(244, 241, 234, 0.22);
}

.page-about .net-node {
  background: rgba(90, 22, 45, 0.86);
  padding: 22px 18px 24px;
  transition: background-color var(--dur) var(--spring), transform var(--dur) var(--spring);
}

.page-about .net-node:hover,
.page-about .net-node:focus-within {
  background: rgba(10, 37, 64, 0.9);
  transform: translateY(-2px);
}

.page-about .net-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 4vw, 2.7rem);
  line-height: 1;
  color: var(--neon);
}

.page-about .net-label {
  display: block;
  margin-top: 12px;
  font-size: 0.875rem;
  line-height: 1.7;
  color: rgba(244, 241, 234, 0.84);
}

.page-about .network-notes {
  margin-top: clamp(24px, 3vw, 38px);
  display: grid;
  gap: 16px;
  max-width: var(--measure);
}

.page-about .network-notes p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(244, 241, 234, 0.82);
}

/* ---------- 资质 ---------- */

.page-about .about-credentials {
  background: var(--paper);
  color: var(--ink);
  padding-block: clamp(52px, 7vw, 112px);
}

.page-about .about-credentials .eyebrow {
  color: var(--slate);
}

.page-about .about-credentials .section-title {
  color: var(--ink);
}

.page-about .cred-grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .cred-lead p {
  margin: 0 0 4px;
  max-width: var(--measure);
  color: var(--slate);
  font-size: 1rem;
  line-height: 1.85;
}

.page-about .cred-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .cred-list li {
  position: relative;
  padding: 0 0 14px 26px;
  border-bottom: 1px solid rgba(16, 20, 24, 0.12);
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .cred-list li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .cred-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 10px;
  height: 10px;
  transform: rotate(45deg);
  border: 1px solid var(--sand);
}

.page-about .cred-figure {
  border-color: rgba(16, 20, 24, 0.14);
  background: rgba(10, 37, 64, 0.06);
}

.page-about .cred-figure figcaption {
  border-top-color: rgba(16, 20, 24, 0.12);
  color: var(--slate);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  background: var(--deep-sea);
  padding-block: clamp(48px, 6vw, 96px);
}

.page-about .cta-panel {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  border: 1px solid var(--pa-line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(27, 31, 75, 0.72), rgba(10, 37, 64, 0.86));
  padding: clamp(24px, 3.6vw, 48px);
}

.page-about .cta-copy h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: var(--step-2);
  font-weight: 700;
  line-height: 1.24;
  color: var(--paper);
}

.page-about .cta-copy p {
  margin: 0;
  max-width: var(--measure);
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--pa-dim);
}

.page-about .cta-actions {
  align-self: end;
}

/* ---------- 响应式 ---------- */

@media (min-width: 760px) {
  .page-about .quality-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .network-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

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

  .page-about .cred-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: start;
  }

  .page-about .cta-panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }
}

@media (min-width: 960px) {
  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    align-items: start;
  }

  .page-about .tl-item {
    display: grid;
    grid-template-columns: 150px minmax(0, 1fr);
    column-gap: 48px;
    padding-left: 0;
    padding-bottom: 28px;
  }

  .page-about .tl-item::before {
    left: 162px;
    top: 0;
    bottom: 0;
    height: auto;
  }

  .page-about .tl-item:last-child::before {
    bottom: auto;
    height: 26px;
  }

  .page-about .tl-item::after {
    left: 157px;
    top: 10px;
    width: 11px;
    height: 11px;
  }

  .page-about .tl-year {
    padding-top: 0;
    font-size: 1.15rem;
  }

  .page-about .tl-body {
    margin-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-body,
  .page-about .net-node {
    transition: none;
  }

  .page-about .tl-body:hover,
  .page-about .net-node:hover,
  .page-about .net-node:focus-within {
    transform: none;
  }
}
<<<END>>>