.page-about {
  --about-cut: 26px;
  --about-rail-x: 11px;
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(30px, 4.5vw, 56px) 0 clamp(44px, 6vw, 92px);
  overflow: hidden;
}

.page-about .about-hero__watermark {
  position: absolute;
  top: -0.08em;
  right: -0.02em;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(110px, 28vw, 300px);
  line-height: 0.78;
  letter-spacing: 0.02em;
  color: rgba(201, 150, 63, 0.07);
  white-space: nowrap;
  pointer-events: none;
  user-select: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3.6vw, 46px);
}

.page-about .about-hero__copy h1 {
  margin: 14px 0 0;
  font-size: clamp(30px, 5.2vw, 52px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--paper);
  max-width: 18ch;
}

.page-about .about-hero__copy .lede {
  margin: 20px 0 0;
  color: var(--muted);
  max-width: 34ch;
}

.page-about .about-hero__marks {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 26px;
  margin: 28px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 14px;
  letter-spacing: 0.02em;
}

.page-about .about-hero__marks .mono-inline {
  color: var(--gold-soft);
  margin-right: 6px;
}

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

.page-about .about-hero__frame {
  aspect-ratio: 3 / 2;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .media {
  position: relative;
  overflow: hidden;
  background: var(--ink-800);
}

.page-about .media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-about .media__caption {
  margin: 14px 0 0;
  padding-left: 12px;
  border-left: 1px solid var(--gold);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 42ch;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  padding: clamp(44px, 6vw, 84px) 0 clamp(38px, 5vw, 70px);
}

.page-about .about-timeline__intro {
  margin-top: clamp(20px, 2.6vw, 30px);
}

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: clamp(32px, 4.2vw, 52px) 0 0;
  padding: 0 0 0 44px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: var(--about-rail-x);
  top: 10px;
  bottom: 24px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--celadon) 46%, rgba(201, 150, 63, 0.12) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(28px, 3.6vw, 46px);
}

.page-about .timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .timeline__dot {
  position: absolute;
  left: -38px;
  top: 7px;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--celadon-bright);
}

.page-about .timeline__stage {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gold);
  text-transform: uppercase;
}

.page-about .timeline__stage .mono-inline {
  margin-right: 8px;
  color: var(--gold-soft);
}

.page-about .timeline__title {
  margin: 8px 0 0;
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .timeline__text {
  margin: 12px 0 0;
  color: var(--muted);
  max-width: 62ch;
}

.page-about .timeline__toggle {
  margin-top: 14px;
}

.page-about .timeline__panel {
  border-left: 1px solid var(--rule);
  margin-top: 4px;
}

.page-about .timeline__panel .expand__body {
  padding: 12px 0 0 16px;
  color: var(--muted);
  font-size: 15px;
}

.page-about .timeline__panel p {
  margin: 0;
  max-width: 58ch;
}

/* ---------- 归档区块 ---------- */
.page-about .about-archive {
  padding: clamp(38px, 5vw, 70px) 0;
  background: linear-gradient(180deg, rgba(22, 40, 61, 0) 0%, rgba(22, 40, 61, 0.85) 22%, rgba(22, 40, 61, 0.85) 78%, rgba(22, 40, 61, 0) 100%);
}

.page-about .about-archive__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 42px);
  align-items: center;
}

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

.page-about .about-archive__frame {
  aspect-ratio: 3 / 2;
  clip-path: polygon(var(--about-cut) 0, 100% 0, 100% 100%, 0 100%, 0 var(--about-cut));
}

.page-about .about-archive__title {
  margin: 0;
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.28;
  color: var(--paper);
  max-width: 22ch;
}

.page-about .about-archive__copy p {
  margin: 16px 0 0;
  color: var(--muted);
  max-width: 34ch;
}

.page-about .about-archive__copy .btn {
  margin-top: 24px;
}

/* ---------- 角色分工 ---------- */
.page-about .about-roles {
  padding: clamp(44px, 6vw, 84px) 0;
}

.page-about .about-roles__lead {
  margin-top: clamp(18px, 2.4vw, 26px);
  max-width: 34ch;
}

.page-about .about-roles__figure {
  margin: clamp(26px, 3.4vw, 40px) 0 0;
}

.page-about .about-roles__frame {
  aspect-ratio: 5 / 3;
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}

.page-about .role-grid {
  margin-top: clamp(28px, 3.6vw, 44px);
  align-items: start;
}

.page-about .role-card {
  position: relative;
  background: var(--ink-800);
  border: 1px solid var(--rule);
  padding: 26px 24px 20px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .role-card::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 46px;
  background: var(--celadon);
}

.page-about .role-card__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--celadon-bright);
}

.page-about .role-card__title {
  margin: 10px 0 0;
  font-size: clamp(20px, 2.4vw, 26px);
  color: var(--paper);
}

.page-about .role-card__lead {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .role-card__trigger {
  margin-top: 16px;
}

.page-about .role-card__panel {
  border-top: 1px solid var(--rule);
  margin-top: 12px;
}

.page-about .role-card__panel .expand__body {
  padding-top: 14px;
}

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

.page-about .role-card__list li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 9px;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.75;
}

.page-about .role-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 1px;
  background: var(--gold);
}

/* ---------- 维护节奏 ---------- */
.page-about .about-rhythm {
  padding: clamp(40px, 5.4vw, 76px) 0;
  background: var(--ink-800);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.page-about .rhythm-list {
  margin-top: clamp(24px, 3.2vw, 38px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about .rhythm-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 22px 0;
  border-top: 1px solid var(--rule);
}

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

.page-about .rhythm-row__key {
  color: var(--gold);
  font-size: 14px;
  letter-spacing: 0.1em;
}

.page-about .rhythm-row__text {
  margin: 0;
  color: var(--muted);
  max-width: 62ch;
}

/* ---------- 规模数据 ---------- */
.page-about .about-scale {
  padding: clamp(40px, 5.4vw, 76px) 0;
}

.page-about .about-scale__title {
  margin: 0;
  font-size: clamp(22px, 3vw, 32px);
  color: var(--paper);
}

.page-about .scale-grid {
  list-style: none;
  margin: clamp(24px, 3.2vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.page-about .scale-item {
  background: var(--ink-900);
  padding: 24px 22px 22px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .scale-item:nth-child(2) {
  background: var(--ink-800);
}

.page-about .scale-item__num {
  font-size: clamp(34px, 6vw, 52px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  letter-spacing: 0.02em;
}

.page-about .scale-item:nth-child(3) .scale-item__num {
  color: var(--celadon-bright);
}

.page-about .scale-item__label {
  color: var(--paper);
  font-size: 15px;
  letter-spacing: 0.02em;
}

.page-about .scale-item__note {
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.7;
}

/* ---------- 承诺收束 ---------- */
.page-about .about-promise {
  padding: 0 0 clamp(48px, 6vw, 88px);
}

.page-about .promise-band {
  position: relative;
  background: linear-gradient(135deg, rgba(74, 58, 120, 0.34) 0%, rgba(30, 45, 70, 0.9) 46%, rgba(14, 26, 43, 0.95) 100%);
  border: 1px solid var(--rule);
  padding: clamp(28px, 4vw, 52px) clamp(22px, 3.4vw, 48px);
  clip-path: polygon(0 0, calc(100% - 40px) 0, 100% 40px, 100% 100%, 0 100%);
}

.page-about .promise-band__title {
  margin: 12px 0 0;
  font-size: clamp(22px, 3vw, 32px);
  color: var(--paper);
}

.page-about .promise-list {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .promise-list li {
  position: relative;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  padding-top: 12px;
  border-top: 1px solid rgba(51, 69, 95, 0.9);
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.78;
}

.page-about .promise-list__n {
  color: var(--gold);
  font-size: 13px;
  letter-spacing: 0.08em;
  padding-top: 3px;
}

.page-about .promise-band__foot {
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding-top: 18px;
  border-top: 1px solid rgba(201, 150, 63, 0.28);
  color: var(--muted);
  font-size: 15px;
  max-width: 60ch;
}

.page-about .promise-band__foot a {
  color: var(--gold-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .promise-band__foot a:hover {
  color: var(--celadon-bright);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .rhythm-row {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 0 26px;
    align-items: baseline;
  }

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

  .page-about .promise-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 30px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
    align-items: start;
  }

  .page-about .about-hero__figure {
    margin-top: 26px;
  }

  .page-about .about-archive__inner {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: clamp(30px, 4vw, 60px);
  }

  .page-about .about-archive__copy {
    padding-top: 12px;
  }

  .page-about .timeline {
    padding-left: 58px;
  }

  .page-about .timeline__dot {
    left: -52px;
  }

  .page-about .role-card:nth-child(2) {
    margin-top: 34px;
  }

  .page-about .role-card:nth-child(3) {
    margin-top: 68px;
  }

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

@media (min-width: 1100px) {
  .page-about .about-hero {
    padding-bottom: clamp(80px, 7vw, 110px);
  }

  .page-about .about-hero__copy h1 {
    max-width: 16ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role-card,
  .page-about .timeline__dot {
    transition: none;
  }
}
<<<END>>>