.page-about {
  --about-rail: 220px;
  --about-gap: clamp(28px, 4.6vw, 64px);
  color: var(--ink);
  background: var(--paper);
}

/* ---------- 封面 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(36px, 6vw, 76px) 0 clamp(40px, 6vw, 80px);
  background: linear-gradient(180deg, var(--paper) 0%, var(--indigo-wash) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--orange) 0 84px, var(--mist) 84px 100%);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: end;
}

.page-about .about-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  font-weight: 500;
  letter-spacing: .18em;
  color: var(--orange-deep);
}

.page-about .about-hero__kicker::before {
  content: "";
  width: 30px;
  height: 2px;
  background: var(--orange);
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: var(--fs-hero);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--indigo);
  text-wrap: balance;
}

.page-about .about-hero__lede {
  max-width: var(--measure);
  margin: 22px 0 0;
  font-size: var(--fs-17);
  line-height: 1.85;
}

.page-about .about-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  margin: 30px 0 0;
  padding: 16px 0 0;
  list-style: none;
  border-top: 1px solid var(--rule);
}

.page-about .about-facts li {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-size: var(--fs-13);
  color: var(--gray);
}

.page-about .about-facts li strong {
  font-family: var(--font-mono);
  font-size: var(--fs-15);
  font-weight: 500;
  color: var(--indigo);
}

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

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 460px;
  object-fit: cover;
  border-radius: 2px;
  background: var(--haze);
}

.page-about .about-hero__media figcaption {
  margin-top: 10px;
  font-size: var(--fs-13);
  line-height: 1.7;
  color: var(--gray);
}

/* ---------- 双栏骨架 ---------- */

.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  padding: clamp(44px, 6vw, 88px) 0 clamp(56px, 7vw, 104px);
}

.page-about .about-flow {
  min-width: 0;
}

.page-about .about-chapter {
  padding-bottom: clamp(44px, 5.4vw, 76px);
}

.page-about .about-chapter + .about-chapter {
  border-top: 1px solid var(--rule);
  padding-top: clamp(38px, 5vw, 68px);
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 20px;
}

.page-about .about-chapter__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--orange);
}

.page-about .about-chapter h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: var(--fs-section);
  font-weight: 600;
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--indigo);
}

.page-about .about-chapter p {
  max-width: var(--measure);
  margin: 0 0 1.2em;
  font-size: var(--fs-17);
  line-height: 1.8;
}

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

.page-about .about-chapter__lead::first-letter {
  float: left;
  margin: 6px 10px 0 0;
  font-family: var(--font-serif);
  font-size: 3.1em;
  font-weight: 700;
  line-height: .9;
  color: var(--indigo);
}

/* ---------- 左栏 ---------- */

.page-about .about-rail {
  display: none;
}

.page-about .about-rail__meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 14px;
  margin-bottom: 22px;
  background: var(--haze);
  border-left: 3px solid var(--orange);
}

.page-about .about-rail__meta-label {
  font-size: var(--fs-12);
  letter-spacing: .12em;
  color: var(--gray);
}

.page-about .about-rail__meta-value {
  font-family: var(--font-mono);
  font-size: var(--fs-20);
  font-weight: 500;
  color: var(--indigo);
}

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

.page-about .about-rail__list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: var(--rule);
}

.page-about .about-rail__item {
  position: relative;
}

.page-about .about-rail__node {
  display: block;
  padding: 9px 0 9px 26px;
  font-size: var(--fs-13);
  line-height: 1.5;
  color: var(--gray);
  text-decoration: none;
  transition: color .22s var(--ease);
}

.page-about .about-rail__node:hover,
.page-about .about-rail__node:focus-visible {
  color: var(--indigo);
}

.page-about .about-rail__dot {
  position: absolute;
  left: 0;
  top: 13px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--mist);
  transition: border-color .22s var(--ease), background-color .22s var(--ease);
}

.page-about .about-rail__node:hover .about-rail__dot,
.page-about .about-rail__node:focus-visible .about-rail__dot {
  border-color: var(--orange);
  background: var(--orange);
}

.page-about .about-rail__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--mist);
}

/* ---------- 四类服务 ---------- */

.page-about .about-services {
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-services__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 6px 14px;
  padding: 22px 0;
  border-top: 1px solid var(--rule);
}

.page-about .about-services__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: var(--fs-20);
  font-weight: 600;
  color: var(--indigo);
}

.page-about .about-services__item p {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--fs-15);
  line-height: 1.8;
}

.page-about .about-services__idx {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  font-weight: 500;
  color: var(--orange);
}

.page-about .about-services__tail {
  max-width: var(--measure);
  margin: 26px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
  font-size: var(--fs-15);
  line-height: 1.8;
  color: var(--gray);
}

/* ---------- 通栏图 ---------- */

.page-about .about-band {
  margin: 0 0 clamp(44px, 5.4vw, 76px);
}

.page-about .about-band img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: 2px;
  background: var(--haze);
}

.page-about .about-band figcaption {
  margin-top: 10px;
  font-size: var(--fs-13);
  line-height: 1.7;
  color: var(--gray);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin-bottom: 30px;
}

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

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 11 / 7;
  object-fit: cover;
  border-radius: 2px;
  background: var(--haze);
}

.page-about .about-team__media figcaption {
  margin-top: 10px;
  font-size: var(--fs-13);
  line-height: 1.7;
  color: var(--gray);
}

.page-about .about-team__copy p {
  max-width: var(--measure);
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.8;
}

.page-about .about-mix {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px 32px;
  margin: 0;
  padding: 28px 0 0;
  list-style: none;
  border-top: 1px solid var(--rule);
}

.page-about .about-mix__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.page-about .about-mix__name {
  font-size: var(--fs-15);
  font-weight: 500;
  color: var(--indigo);
}

.page-about .about-mix__num {
  font-size: var(--fs-13);
  font-weight: 500;
  color: var(--gray);
}

.page-about .about-mix__track {
  height: 6px;
  border-radius: 999px;
  background: var(--haze);
  overflow: hidden;
}

.page-about .about-mix__fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: var(--mist);
  transition: background-color .22s var(--ease);
}

.page-about .about-mix__item:hover .about-mix__fill {
  background: var(--orange);
}

.page-about .about-mix__note {
  margin: 9px 0 0;
  font-size: var(--fs-13);
  line-height: 1.7;
  color: var(--gray);
  transition: color .22s var(--ease);
}

.page-about .about-mix__item:hover .about-mix__note {
  color: var(--ink);
}

/* ---------- 反馈模板 ---------- */

.page-about .about-format {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 12px;
  margin-top: 22px;
  padding: 18px;
  background: var(--indigo-wash);
  border-radius: 3px;
}

.page-about .about-format .code {
  flex: 1 1 320px;
  min-width: 0;
  margin: 0;
  background: transparent;
}

.page-about .about-format pre {
  margin: 0;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  line-height: 1.9;
  color: var(--indigo);
  white-space: pre-wrap;
  word-break: break-word;
}

.page-about .about-format .code__copy {
  flex: none;
  cursor: pointer;
}

/* ---------- 更新节拍 ---------- */

.page-about .about-cadence {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: 26px 0 30px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.page-about .about-cadence li {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 8px 14px;
  padding: 16px 0;
}

.page-about .about-cadence li + li {
  border-top: 1px solid var(--rule);
}

.page-about .about-cadence__k {
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  font-weight: 500;
  color: var(--mist);
}

.page-about .about-cadence li strong {
  font-family: var(--font-mono);
  font-size: var(--fs-26);
  font-weight: 500;
  line-height: 1.1;
  color: var(--indigo);
}

.page-about .about-cadence__d {
  font-size: var(--fs-13);
  color: var(--gray);
}

/* ---------- 收束区块 ---------- */

.page-about .about-chapter--wash {
  padding: clamp(28px, 4vw, 48px);
  margin: 0 calc(-1 * clamp(0px, 2vw, 24px));
  background: var(--haze);
  border-radius: 3px;
}

.page-about .about-cta {
  margin-top: 30px;
  padding-top: 24px;
  border-top: 1px solid rgba(44, 58, 91, .18);
}

.page-about .about-cta__line {
  margin: 0 0 16px;
  font-size: var(--fs-15);
  color: var(--indigo);
}

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

/* ---------- 响应式 ---------- */

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

  .page-about .about-cadence li {
    grid-template-columns: 96px minmax(0, 1fr) minmax(0, auto);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 60px);
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(24px, 3vw, 40px);
    align-items: center;
  }
}

@media (min-width: 980px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 48px;
    align-self: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__node,
  .page-about .about-rail__dot,
  .page-about .about-mix__fill,
  .page-about .about-mix__note {
    transition-duration: .12s;
  }
}
<<<END>>>