.page-about {
  --about-hair: rgba(16, 24, 40, 0.14);
  --about-hair-dark: rgba(255, 255, 255, 0.16);
  --about-cyan-ghost: rgba(0, 229, 255, 0.24);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

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

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin: 0;
}

.page-about figcaption {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  line-height: 1.65;
  letter-spacing: 0.03em;
  color: var(--slate);
  margin-top: 0.75rem;
  padding-left: 0.75rem;
  border-left: 2px solid var(--amber);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background-color: var(--indigo-900);
  background-image:
    repeating-linear-gradient(90deg, rgba(0, 229, 255, 0.07) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(0deg, rgba(0, 229, 255, 0.05) 0 1px, transparent 1px 96px);
  color: #fff;
  padding-top: clamp(1rem, 3vw, 1.75rem);
  padding-bottom: clamp(2.5rem, 7vw, 4.5rem);
}

.page-about .about-hero .breadcrumb,
.page-about .about-hero .breadcrumb ol,
.page-about .about-hero .breadcrumb li,
.page-about .about-hero .breadcrumb a {
  color: rgba(255, 255, 255, 0.7);
}

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

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  margin-top: clamp(1rem, 3vw, 1.75rem);
  align-items: end;
}

.page-about .about-hero-copy h1 {
  font-size: clamp(2rem, 7.5vw, 5.25rem);
  margin-top: 0.6rem;
  color: #fff;
}

.page-about .hero-line {
  display: block;
}

.page-about .hero-line--cyan {
  color: var(--cyan);
}

.page-about .about-hero .lede {
  margin-top: 1.25rem;
  max-width: 54ch;
  color: rgba(255, 255, 255, 0.78);
  font-size: clamp(0.95rem, 2vw, 1.05rem);
  line-height: 1.85;
}

.page-about .hero-metrics {
  list-style: none;
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-hair-dark);
  border: 1px solid var(--about-hair-dark);
}

.page-about .hero-metrics > li {
  background: var(--indigo-900);
  padding: 0.8rem 0.9rem;
}

.page-about .hm-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 4.5vw, 2.1rem);
  letter-spacing: -0.02em;
  color: var(--cyan);
  line-height: 1;
}

.page-about .hm-label {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.66);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: clamp(1.25rem, 3vw, 1.75rem);
}

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

.page-about .about-portrait .media-frame {
  border: 1px solid var(--about-cyan-ghost);
}

.page-about .about-portrait figcaption {
  color: rgba(255, 255, 255, 0.62);
}

.page-about .about-index {
  margin-top: clamp(2rem, 5vw, 3rem);
  padding-top: 1rem;
  border-top: 1px solid var(--about-hair-dark);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.07em;
}

.page-about .about-index-title {
  margin: 0;
  color: var(--amber);
}

.page-about .about-index ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 1.35rem;
  counter-reset: idx;
}

.page-about .about-index li {
  counter-increment: idx;
}

.page-about .about-index li::before {
  content: "0" counter(idx);
  color: rgba(255, 255, 255, 0.36);
  margin-right: 0.4rem;
}

.page-about .about-index a {
  color: rgba(255, 255, 255, 0.78);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

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

/* ---------- 区块标题 ---------- */
.page-about .about-head {
  max-width: 64ch;
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-head h2 {
  font-size: clamp(1.6rem, 4.2vw, 2.9rem);
  margin-top: 0.55rem;
  color: var(--ink);
}

.page-about .about-head-note {
  margin: 0.9rem 0 0;
  max-width: 48ch;
  color: var(--slate);
  font-size: 1rem;
  line-height: 1.8;
}

/* ---------- 发展时间线 ---------- */
.page-about .about-timeline {
  background: var(--paper);
}

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

.page-about .timeline-list::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 0.4rem;
  bottom: 0.6rem;
  width: 1px;
  background: linear-gradient(180deg, var(--teal) 0%, rgba(0, 107, 122, 0.1) 100%);
}

.page-about .tl-item {
  position: relative;
  padding-left: 2rem;
  margin-bottom: 1.25rem;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85rem;
  width: 13px;
  height: 13px;
  box-sizing: border-box;
  background: var(--paper);
  border: 1px solid var(--teal);
}

.page-about .tl-item:last-child::before {
  background: var(--amber);
  border-color: var(--amber);
}

.page-about .tl-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--teal);
  background: rgba(0, 107, 122, 0.08);
  padding: 0.22rem 0.5rem;
  margin-bottom: 0.6rem;
}

.page-about .tl-card {
  position: relative;
  background: var(--white);
  border: 1px solid var(--about-hair);
  border-left: 2px solid var(--teal);
  padding: clamp(1rem, 3vw, 1.6rem);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.page-about .tl-card:hover {
  transform: translateX(4px);
  border-left-color: var(--amber);
}

.page-about .tl-card h3 {
  font-size: clamp(1.1rem, 2.6vw, 1.45rem);
  padding-right: 4.5rem;
  margin-bottom: 0.55rem;
  color: var(--ink);
}

.page-about .tl-card p {
  margin: 0;
  color: var(--slate);
  font-size: 0.95rem;
  line-height: 1.85;
}

.page-about .tl-batch {
  position: absolute;
  top: 0;
  right: 0;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  background: var(--indigo-900);
  color: var(--cyan);
  padding: 0.28rem 0.55rem;
}

.page-about .tl-batch--live {
  background: var(--amber);
  color: var(--ink);
}

.page-about .about-timeline-figure {
  margin: clamp(2rem, 5vw, 3rem) 0 0;
}

/* ---------- 团队岗位 ---------- */
.page-about .about-team {
  background: var(--white);
  border-top: 1px solid var(--about-hair);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .role-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
}

.page-about .role-card {
  background: var(--indigo-700);
  color: #fff;
  padding: clamp(1.15rem, 3vw, 1.7rem);
  border-top: 3px solid var(--cyan);
  transition: transform 0.2s ease;
}

.page-about .role-card:nth-child(3) {
  border-top-color: var(--amber);
}

.page-about .role-card:hover {
  transform: translateY(-3px);
}

.page-about .role-code {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .role-card h3 {
  font-size: clamp(1.25rem, 3vw, 1.6rem);
  margin-top: 0.5rem;
  color: #fff;
}

.page-about .role-count {
  margin: 0.35rem 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 4vw, 2rem);
  letter-spacing: -0.02em;
  color: var(--amber);
  line-height: 1;
}

.page-about .role-list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  border-top: 1px solid var(--about-hair-dark);
  padding-top: 0.9rem;
}

.page-about .role-list li {
  position: relative;
  padding-left: 1rem;
  margin-bottom: 0.55rem;
  font-size: 0.9rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.78);
}

.page-about .role-list li:last-child {
  margin-bottom: 0;
}

.page-about .role-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 6px;
  height: 1px;
  background: var(--cyan);
}

.page-about .role-out {
  margin: 1rem 0 0;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--about-hair-dark);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: rgba(255, 255, 255, 0.6);
}

/* ---------- 四级校验 ---------- */
.page-about .about-process {
  background: var(--mist);
}

.page-about .about-process-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
}

.page-about .check-list {
  list-style: none;
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 0;
  padding: 0;
}

.page-about .check-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1rem;
  padding: 1rem 0.75rem;
  border-top: 1px solid var(--about-hair);
  transition: background 0.2s ease;
}

.page-about .check-item:last-child {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .check-item:hover {
  background: rgba(0, 229, 255, 0.14);
}

.page-about .check-num {
  font-family: var(--font-mono);
  font-size: clamp(1.1rem, 3vw, 1.45rem);
  line-height: 1;
  color: var(--teal);
  letter-spacing: 0.02em;
}

.page-about .check-item h3 {
  font-size: clamp(1rem, 2.4vw, 1.25rem);
  margin-bottom: 0.4rem;
  color: var(--ink);
}

.page-about .check-item p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-process-figure {
  margin: 0;
}

.page-about .about-process-figure .media-frame {
  border: 1px solid var(--about-hair);
}

/* ---------- 服务范围 ---------- */
.page-about .about-scale {
  background-color: var(--indigo-900);
  background-image: radial-gradient(circle at 84% 14%, rgba(0, 229, 255, 0.16), transparent 48%);
  color: #fff;
}

.page-about .about-scale .about-head h2 {
  color: #fff;
}

.page-about .about-scale .about-head-note {
  color: rgba(255, 255, 255, 0.68);
}

.page-about .scale-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-hair-dark);
  border: 1px solid var(--about-hair-dark);
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding: 0;
}

.page-about .scale-grid > div {
  background: var(--indigo-900);
  padding: clamp(1rem, 3vw, 1.45rem);
  display: flex;
  flex-direction: column-reverse;
  gap: 0.4rem;
}

.page-about .scale-grid dt {
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.66);
}

.page-about .scale-grid dd {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 5vw, 2.5rem);
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--cyan);
}

.page-about .scale-note {
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 0;
  max-width: 62ch;
  font-size: 0.9rem;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.68);
  padding-left: 0.9rem;
  border-left: 2px solid var(--amber);
}

/* ---------- 合作与实践 ---------- */
.page-about .about-partners {
  background: var(--paper);
}

.page-about .about-partners-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
}

.page-about .about-partners-text {
  margin: 1.25rem 0 0;
  max-width: 46ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--slate);
}

.page-about .about-partners-link {
  margin-top: 1.5rem;
}

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

.page-about .partner-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1rem;
  align-items: baseline;
  padding: clamp(1rem, 2.5vw, 1.4rem) 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .partner-list li:last-child {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .pl-num {
  font-family: var(--font-mono);
  font-size: 1rem;
  letter-spacing: 0.04em;
  background: var(--indigo-900);
  color: var(--amber);
  padding: 0.2rem 0.55rem;
}

.page-about .partner-list h3 {
  font-size: clamp(1rem, 2.4vw, 1.2rem);
  margin-bottom: 0.4rem;
  color: var(--ink);
}

.page-about .partner-list p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  background: var(--white);
  border-top: 1px solid var(--about-hair);
}

.page-about .about-next-inner {
  border-left: 4px solid var(--amber);
  padding-left: clamp(1rem, 3vw, 1.75rem);
}

.page-about .about-next h2 {
  font-size: clamp(1.5rem, 4vw, 2.3rem);
  color: var(--ink);
}

.page-about .next-links {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.75rem;
  margin-top: clamp(1.25rem, 3vw, 1.75rem);
}

.page-about .next-links a {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.35rem 1rem;
  padding: 1rem 1.1rem;
  background: var(--paper);
  border: 1px solid var(--about-hair);
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .next-links a span:last-child {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--teal);
}

.page-about .next-links a:hover {
  border-color: var(--amber);
  transform: translateY(-2px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .hero-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 860px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .tl-item {
    display: grid;
    grid-template-columns: 112px minmax(0, 1fr);
    gap: clamp(1rem, 3vw, 2rem);
    padding-left: 2.5rem;
    margin-bottom: 1.75rem;
  }

  .page-about .tl-item::before {
    top: 1.15rem;
  }

  .page-about .tl-year {
    justify-self: start;
    margin: 0.55rem 0 0;
  }

  .page-about .tl-item:nth-child(even) .tl-card {
    margin-left: clamp(0px, 3vw, 2.5rem);
  }
}

@media (min-width: 900px) {
  .page-about .about-process-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-about .about-partners-grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-about .role-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.5rem;
    align-items: start;
  }

  .page-about .role-card:nth-child(2) {
    margin-top: 2rem;
  }

  .page-about .role-card:nth-child(3) {
    margin-top: 4rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-card,
  .page-about .role-card,
  .page-about .next-links a,
  .page-about .about-index a {
    transition: none;
  }

  .page-about .tl-card:hover,
  .page-about .role-card:hover,
  .page-about .next-links a:hover {
    transform: none;
  }
}
<<<END>>>