.page-about {
  background: var(--ink-deep);
  color: var(--sand);
}

.page-about .about-crumb {
  padding: 20px 0 6px;
}

.page-about .about-crumb .breadcrumb {
  font-size: 13px;
  color: var(--mist);
}

.page-about .about-crumb .breadcrumb a {
  color: var(--sand);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.22s var(--ease), color 0.22s var(--ease);
}

.page-about .about-crumb .breadcrumb a:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 24px 0 64px;
  border-bottom: 1px solid var(--rule);
  background:
    radial-gradient(120% 90% at 82% 0%, rgba(255, 107, 26, 0.18), transparent 55%),
    linear-gradient(180deg, #072030 0%, var(--ink-deep) 74%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(20, 58, 85, 0.5) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(0deg, rgba(20, 58, 85, 0.35) 0 1px, transparent 1px 96px);
  pointer-events: none;
  opacity: 0.9;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 36px;
}

.page-about .about-hero-main h1 {
  margin: 20px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6.4vw, 84px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-hero-main h1 em {
  font-style: normal;
  color: var(--orange);
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: -0.04em;
}

.page-about .about-lead {
  margin: 22px 0 0;
  max-width: 48ch;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.85;
  color: var(--sand);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 34px;
  margin: 30px 0 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--rule);
}

.page-about .about-hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(20px, 2.4vw, 26px);
  color: var(--white);
  letter-spacing: -0.02em;
}

.page-about .stat-unit {
  font-size: 0.62em;
  color: var(--orange);
  margin-left: 1px;
}

.page-about .stat-label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .about-hero-plate {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 24px 60px 28px 22px;
  border: 1px solid var(--rule);
  background: linear-gradient(155deg, var(--panel) 0%, var(--panel-2) 100%);
}

.page-about .about-hero-plate::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, transparent 50%, var(--orange) 50%);
}

.page-about .plate-note {
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .plate-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(62px, 12vw, 132px);
  line-height: 0.92;
  letter-spacing: -0.05em;
  color: var(--white);
}

.page-about .plate-sub {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--sand);
  letter-spacing: 0.04em;
}

.page-about .plate-rot {
  position: absolute;
  top: 22px;
  right: 12px;
  writing-mode: vertical-rl;
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--orange);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: 52px 0;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-chapter:last-of-type {
  border-bottom: 0;
}

.page-about .about-chapter-inner {
  display: grid;
  gap: 18px;
}

.page-about .about-chapter-head {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .chapter-num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .chapter-kicker {
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .chapter-short {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.14em;
  color: var(--sand);
}

.page-about .about-h2 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.4vw, 38px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-chapter-body p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--sand);
}

.page-about .about-tail {
  margin-top: 22px;
  padding-left: 14px;
  border-left: 2px solid var(--orange);
  font-size: 15px;
  color: var(--mist);
}

.page-about .about-note-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-note-list li {
  position: relative;
  padding: 14px 16px 14px 34px;
  background: var(--panel);
  border: 1px solid var(--rule);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--sand);
}

.page-about .about-note-list li::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 22px;
  width: 6px;
  height: 6px;
  background: var(--cyan);
  transform: rotate(45deg);
}

.page-about .about-note-list strong {
  color: var(--white);
  font-weight: 700;
  margin-right: 2px;
}

/* ---------- V2.0 升级清单 ---------- */
.page-about .about-upgrade {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  counter-reset: none;
}

.page-about .about-upgrade li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--rule);
}

.page-about .about-upgrade li:last-child {
  border-bottom: 1px solid var(--rule);
}

.page-about .up-num {
  font-family: var(--font-en);
  font-weight: 700;
  font-size: 22px;
  line-height: 1.2;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .about-upgrade h4 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-upgrade p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--sand);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  position: relative;
  margin: 0 0 26px;
  border: 1px solid var(--rule);
  background: var(--panel-2);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.05);
}

.page-about .about-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--rule);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
  background: var(--panel);
}

.page-about .about-figure--wide img {
  aspect-ratio: 3 / 2;
}

/* ---------- 时间轴 ---------- */
.page-about .tl-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
}

.page-about .tl-entry {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  margin-bottom: 12px;
}

.page-about .tl-year {
  padding-top: 14px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--mist);
  text-align: right;
}

.page-about .tl-entry--now .tl-year {
  color: var(--orange);
}

.page-about .tl-details {
  border: 1px solid var(--rule);
  border-left: 3px solid var(--rule);
  background: var(--panel);
  transition: border-color 0.22s var(--ease), background 0.22s var(--ease);
}

.page-about .tl-details:hover {
  border-left-color: var(--orange-deep);
}

.page-about .tl-details[open] {
  border-left-color: var(--orange);
  background: var(--panel-2);
}

.page-about .tl-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--white);
  list-style: none;
}

.page-about .tl-summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--orange);
  transition: transform 0.22s var(--ease);
}

.page-about .tl-details[open] .tl-summary::after {
  transform: rotate(45deg);
}

.page-about .tl-body {
  padding: 0 16px 15px;
}

.page-about .tl-body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--sand);
}

/* ---------- 流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-steps li {
  padding: 18px 18px 16px;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-top: 2px solid var(--rule);
  transition: border-top-color 0.22s var(--ease);
}

.page-about .about-steps li:hover {
  border-top-color: var(--cyan);
}

.page-about .step-idx {
  display: inline-block;
  margin-bottom: 8px;
  padding: 3px 10px;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--ink-deep);
  background: var(--sand);
}

.page-about .about-steps p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--sand);
}

/* ---------- 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  gap: 24px;
  margin-top: 20px;
}

.page-about .about-team-figure {
  margin: 0;
  border: 1px solid var(--rule);
  background: var(--panel-2);
  overflow: hidden;
}

.page-about .about-team-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.05);
}

.page-about .about-team-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--rule);
  font-size: 12.5px;
  color: var(--mist);
  background: var(--panel);
}

.page-about .team-bars {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .team-bars li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 10px;
  align-items: baseline;
}

.page-about .team-role {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  color: var(--white);
}

.page-about .team-count {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 14px;
  color: var(--cyan);
}

.page-about .team-bar {
  grid-column: 1 / -1;
  position: relative;
  display: block;
  height: 5px;
  margin-top: 4px;
  background: var(--rule);
  overflow: hidden;
}

.page-about .team-bar::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: var(--team-w, 0%);
  background: linear-gradient(90deg, var(--orange-deep), var(--orange));
}

.page-about .team-bars li:nth-child(1) { --team-w: 37.5%; }
.page-about .team-bars li:nth-child(2) { --team-w: 25%; }
.page-about .team-bars li:nth-child(3) { --team-w: 28.1%; }
.page-about .team-bars li:nth-child(4) { --team-w: 9.4%; }

.page-about .team-desc {
  grid-column: 1 / -1;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 服务区域 ---------- */
.page-about .region-nodes {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .node {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 2px 10px;
  padding: 12px 14px;
  background: var(--panel-2);
  border: 1px solid var(--rule);
  transition: border-color 0.22s var(--ease), background 0.22s var(--ease);
}

.page-about .node:hover,
.page-about .node:focus-visible {
  border-color: var(--cyan);
  background: var(--panel);
  outline: none;
}

.page-about .node-idx {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
  letter-spacing: 0.1em;
  align-self: center;
}

.page-about .node-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  color: var(--white);
}

.page-about .node-desc {
  grid-column: 2 / -1;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 信任清单 ---------- */
.page-about .trust-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .trust-list li {
  padding: 16px 18px;
  border: 1px solid var(--rule);
  background:
    linear-gradient(180deg, rgba(255, 107, 26, 0.05), transparent 60%),
    var(--panel);
}

.page-about .trust-list h4 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}

.page-about .trust-list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--sand);
}

.page-about .about-cta {
  margin-top: 32px;
  padding: 26px 22px;
  border: 1px solid var(--rule);
  border-left: 4px solid var(--orange);
  background: linear-gradient(140deg, var(--panel) 0%, var(--panel-2) 100%);
}

.page-about .about-cta h4 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(19px, 2.6vw, 24px);
  color: var(--white);
}

.page-about .about-cta p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--sand);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-chapter {
    padding: 64px 0;
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-crumb {
    padding: 26px 0 10px;
  }

  .page-about .about-hero {
    padding: 32px 0 84px;
  }

  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, 0.82fr);
    align-items: end;
    gap: 52px;
  }

  .page-about .about-chapter-inner {
    grid-template-columns: 178px minmax(0, 1fr);
    column-gap: 56px;
  }

  .page-about .about-chapter-head {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    align-items: start;
    gap: 32px;
  }

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

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

  .page-about .about-cta {
    padding: 34px 32px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero-plate {
    padding: 30px 64px 34px 26px;
  }

  .page-about .tl-entry {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 18px;
  }

  .page-about .tl-year {
    font-size: 14px;
    padding-top: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-summary::after,
  .page-about .tl-details,
  .page-about .node,
  .page-about .about-steps li {
    transition: none;
  }
}
<<<END>>>