.page-about {
  --about-body: #D6DFEE;
  --about-dim: #93A2B8;
  background:
    radial-gradient(120% 55% at 85% -12%, rgba(42, 26, 74, 0.5), transparent 62%),
    radial-gradient(90% 55% at -5% 0%, rgba(12, 43, 47, 0.55), transparent 58%);
  color: var(--about-body);
}

.page-about .about-top {
  padding-bottom: clamp(8px, 2vw, 18px);
}

.page-about .breadcrumb {
  font-size: 13px;
  letter-spacing: 0.04em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding-block: clamp(18px, 3vw, 30px) clamp(28px, 5vw, 56px);
}

.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--green);
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-size: clamp(38px, 6.4vw, 76px);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--white);
}

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

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 46ch;
  font-size: clamp(16px, 1.7vw, 18px);
  line-height: 1.88;
  color: var(--about-body);
}

.page-about .about-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-meta li {
  padding-left: 10px;
  border-left: 2px solid var(--green);
  font-size: 13px;
  line-height: 1.6;
  color: var(--about-dim);
}

.page-about .about-meta .num {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

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

.page-about .img-frame {
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(12, 43, 47, 0.9), rgba(7, 11, 20, 0.95));
}

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

.page-about .about-hero__media figcaption,
.page-about .about-figure figcaption {
  margin-top: 12px;
  font-size: 12.5px;
  line-height: 1.75;
  letter-spacing: 0.02em;
  color: var(--about-dim);
}

/* ---------- 主栏与侧栏 ---------- */
.page-about .about-grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  padding-block: clamp(24px, 4vw, 48px) clamp(48px, 8vw, 96px);
}

.page-about .about-main {
  min-width: 0;
  max-width: 820px;
}

.page-about .about-chapter {
  padding-block: clamp(30px, 5vw, 56px);
  border-top: 1px solid var(--line);
}

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

.page-about .chapter-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .section-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.2vw, 52px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: transparent;
  -webkit-text-stroke: 1px var(--line-strong);
}

.page-about .about-chapter h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(23px, 3.4vw, 34px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-chapter p {
  margin: 0 0 16px;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--about-body);
}

.page-about .about-chapter p:last-child {
  margin-bottom: 0;
}

.page-about .about-chapter a {
  color: var(--green);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .chapter-note {
  margin-top: 22px;
  padding-left: 14px;
  border-left: 2px solid var(--orange);
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-dim);
}

/* ---------- 服务对象 ---------- */
.page-about .about-audience {
  display: grid;
  gap: 12px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-audience li {
  padding: 16px 18px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: rgba(16, 27, 51, 0.72);
}

.page-about .about-audience strong {
  display: block;
  margin-bottom: 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--green);
}

.page-about .about-audience span {
  display: block;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-body);
}

/* ---------- 生产流程 ---------- */
.page-about .flow {
  display: grid;
  gap: 12px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow__item {
  position: relative;
  padding: 16px 18px 16px 56px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: rgba(16, 27, 51, 0.72);
  transition: border-color 0.16s ease, background 0.16s ease;
}

.page-about .flow__item:hover {
  border-color: rgba(183, 255, 60, 0.38);
  background: rgba(12, 43, 47, 0.72);
}

.page-about .flow__no {
  position: absolute;
  left: 18px;
  top: 17px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--orange);
}

.page-about .flow__item strong {
  display: block;
  margin-bottom: 4px;
  font-size: 15.5px;
  color: var(--white);
}

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

.page-about .about-figure {
  margin: 30px 0 0;
}

/* ---------- 团队与协作 ---------- */
.page-about .about-stats {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-stat {
  position: relative;
  padding: 20px 22px;
  border-radius: var(--r-lg);
  border: 1px solid rgba(183, 255, 60, 0.18);
  background: linear-gradient(150deg, rgba(12, 43, 47, 0.95), rgba(7, 11, 20, 0.92));
  outline: none;
}

.page-about .about-stat:focus-visible {
  border-color: var(--green);
  box-shadow: 0 0 0 2px rgba(183, 255, 60, 0.35);
}

.page-about .about-stat__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(38px, 5vw, 52px);
  font-weight: 700;
  line-height: 1;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__label {
  margin: 8px 0 0;
  font-size: 14px;
  letter-spacing: 0.03em;
  color: var(--white);
}

.page-about .about-stat__note {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--about-dim);
}

.page-about .net-wrap {
  margin-top: 26px;
  padding: clamp(16px, 2.5vw, 24px);
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: rgba(10, 17, 32, 0.7);
}

.page-about .net-map {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .net-map text {
  font-family: var(--font-sans);
}

.page-about .net-caption {
  margin: 14px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--about-dim);
}

/* ---------- 发展历程 ---------- */
.page-about .timeline {
  list-style: none;
  position: relative;
  margin: 26px 0 0;
  padding: 0 0 0 4px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--orange), rgba(255, 106, 42, 0.06));
}

.page-about .timeline__item {
  position: relative;
  padding-left: 34px;
  margin-bottom: 12px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 18px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 42, 0.16);
}

.page-about .tl summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  padding: 12px 16px;
  cursor: pointer;
  list-style: none;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: rgba(16, 27, 51, 0.72);
  transition: border-color 0.16s ease, background 0.16s ease;
}

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

.page-about .tl summary:hover {
  border-color: rgba(255, 106, 42, 0.45);
}

.page-about .tl summary:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
}

.page-about .tl[open] summary {
  border-color: rgba(183, 255, 60, 0.4);
  background: rgba(12, 43, 47, 0.86);
}

.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--orange);
}

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

.page-about .tl__body {
  margin: 10px 0 0;
  padding: 0 16px 6px;
  max-width: 62ch;
  font-size: 14.8px;
  line-height: 1.85;
  color: var(--about-body);
}

/* ---------- 标准与服务 ---------- */
.page-about .std-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .std-list li {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .std-list li:first-child {
  padding-top: 0;
}

.page-about .std-list__key {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--green);
}

.page-about .std-list p {
  margin: 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--about-body);
}

.page-about .about-callout {
  margin: 26px 0 0;
  padding: 18px 20px;
  border-radius: var(--r-md);
  border-left: 3px solid var(--orange);
  background: linear-gradient(140deg, rgba(74, 18, 32, 0.92), rgba(42, 26, 74, 0.65));
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--white);
}

/* ---------- 行业参与 ---------- */
.page-about .about-honors {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

/* ---------- 行动区 ---------- */
.page-about .about-cta {
  margin-top: clamp(30px, 5vw, 56px);
  padding: clamp(24px, 4vw, 42px);
  border-radius: var(--r-xl);
  border: 1px solid var(--line-strong);
  background: linear-gradient(150deg, rgba(16, 27, 51, 0.96), rgba(10, 17, 32, 0.96));
  box-shadow: inset 0 1px 0 rgba(183, 255, 60, 0.35);
}

.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  line-height: 1.3;
  color: var(--white);
}

.page-about .cta-steps {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .cta-steps li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .cta-steps .num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--yellow);
  padding-top: 3px;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 侧栏 ---------- */
.page-about .about-rail {
  min-width: 0;
}

.page-about .about-rail__inner {
  display: grid;
  gap: 22px;
  padding: 22px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: rgba(16, 27, 51, 0.72);
}

.page-about .about-rail__title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--about-dim);
}

.page-about .rail-nav {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .rail-nav a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 10px;
  border-radius: var(--r-sm);
  font-size: 14.5px;
  color: var(--white);
  text-decoration: none;
  transition: background 0.16s ease, color 0.16s ease;
}

.page-about .rail-nav a:hover,
.page-about .rail-nav a:focus-visible {
  background: rgba(183, 255, 60, 0.12);
  color: var(--green);
  outline: none;
}

.page-about .rail-nav .num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--orange);
}

.page-about .rail-stats dl {
  margin: 12px 0 0;
  display: grid;
  gap: 12px;
}

.page-about .rail-stats div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.page-about .rail-stats div:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .rail-stats dt {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--about-dim);
}

.page-about .rail-stats dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14.5px;
  font-weight: 700;
  color: var(--green);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.page-about .rail-cta {
  width: 100%;
  justify-content: center;
  text-align: center;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-audience {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 720px) {
  .page-about .std-list li {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
  }

  .page-about .about-stat__note {
    opacity: 0;
    max-height: 0;
    overflow: hidden;
    transform: translateY(4px);
    transition: opacity 0.18s ease, transform 0.18s ease, max-height 0.18s ease;
  }

  .page-about .about-stat:hover .about-stat__note,
  .page-about .about-stat:focus .about-stat__note,
  .page-about .about-stat:focus-within .about-stat__note {
    opacity: 1;
    max-height: 140px;
    transform: translateY(0);
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: end;
  }

  .page-about .about-hero__media {
    transform: translateY(6px);
  }
}

@media (min-width: 1024px) {
  .page-about .about-grid {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: clamp(40px, 5vw, 76px);
    align-items: start;
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: 104px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .flow__item,
  .page-about .tl summary,
  .page-about .rail-nav a,
  .page-about .about-stat__note {
    transition: none;
  }
}
<<<PAGE_CSS_END>>>