.page-about {
  --about-line: 2px solid var(--ink);
  --about-hair: 1px solid var(--ink-12);
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-crumbs {
  padding-top: clamp(16px, 3vw, 28px);
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-60);
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--ink-25);
}

.page-about .breadcrumbs a {
  color: var(--ink-80);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--jade);
  border-bottom-color: var(--jade);
}

.page-about .breadcrumbs [aria-current="page"] {
  color: var(--ink);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4vw, 48px) 0 0;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, var(--ink-12) 0 1px, transparent 1px 104px),
    repeating-linear-gradient(0deg, var(--ink-12) 0 1px, transparent 1px 104px);
  opacity: 0.45;
  pointer-events: none;
}

.page-about .about-hero > .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: end;
}

.page-about .about-hero__lead .eyebrow {
  display: block;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--steel);
}

.page-about .about-hero__title {
  margin: 0;
  font-size: clamp(38px, 8.2vw, 92px);
  font-weight: 900;
  line-height: 0.98;
  letter-spacing: -0.045em;
  color: var(--ink);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--clay);
  background-image: linear-gradient(to top, var(--sand) 0, var(--sand) 0.24em, transparent 0.24em);
}

.page-about .about-hero__lede {
  max-width: 48ch;
  margin: 22px 0 0;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.85;
  color: var(--ink-80);
}

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

.page-about .about-hero__visual {
  position: relative;
  border: var(--about-line);
  background: var(--paper-deep);
  box-shadow: var(--shadow-paper);
  overflow: hidden;
}

.page-about .about-hero__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 7 / 4;
  object-fit: cover;
}

.page-about .about-hero__stamp {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 8px 14px;
  background: var(--ink);
  color: var(--paper);
  font-size: 11px;
  letter-spacing: 0.14em;
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-top: var(--about-line);
  border-bottom: var(--about-line);
}

.page-about .about-stats__item {
  padding: 18px 14px 20px;
  border-right: 1px solid var(--ink-12);
  border-bottom: 1px solid var(--ink-12);
}

.page-about .about-stats__item:nth-child(2n) {
  border-right: 0;
}

.page-about .about-stats__item:nth-last-child(-n + 2) {
  border-bottom: 0;
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-stats__num small {
  margin-left: 2px;
  font-size: 0.5em;
  color: var(--ember);
}

.page-about .about-stats__key {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-60);
}

/* ---------- 通用区块 ---------- */

.page-about .about-section {
  padding: clamp(48px, 7vw, 88px) 0;
}

.page-about .about-head {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-head__title {
  margin: 0;
  font-size: clamp(26px, 4vw, 44px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.035em;
  color: var(--ink);
}

.page-about .about-head__text {
  margin: 0;
  max-width: 52ch;
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 1.85;
  color: var(--ink-60);
}

/* ---------- 起点 ---------- */

.page-about .about-origin__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-origin__body .about-head__title {
  margin-bottom: 18px;
}

.page-about .about-origin__lead {
  margin: 0 0 20px;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 500;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .about-origin__p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-80);
}

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

.page-about .about-quote {
  margin: 0;
  padding: 24px 22px;
  background: var(--sand);
  border: var(--about-line);
  box-shadow: 8px 8px 0 var(--ink);
}

.page-about .about-quote__text {
  margin: 0;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 700;
  line-height: 1.65;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-quote__from {
  display: block;
  margin-top: 16px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-80);
}

/* ---------- 索引方法 ---------- */

.page-about .about-method {
  background: var(--paper-deep);
  border-top: var(--about-line);
  border-bottom: var(--about-line);
}

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

.page-about .about-step {
  display: flex;
  flex-direction: column;
  padding: 22px 20px 20px;
  background: var(--paper);
  border: var(--about-line);
}

.page-about .about-step__idx {
  display: block;
  margin-bottom: 12px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ember);
}

.page-about .about-step__title {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-step__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-80);
}

.page-about .about-step__more {
  margin-top: auto;
  padding-top: 16px;
}

.page-about .about-step__more summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--jade);
  border-bottom: 1px dashed var(--jade);
  transition: color var(--ease);
}

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

.page-about .about-step__more summary::after {
  content: "+";
  font-size: 13px;
}

.page-about .about-step__more[open] summary::after {
  content: "−";
}

.page-about .about-step__more summary:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.page-about .about-step__more p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-60);
}

.page-about .about-method__figure {
  margin: clamp(28px, 4vw, 40px) 0 0;
  border: var(--about-line);
  background: var(--paper);
}

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

.page-about .about-method__figure figcaption {
  padding: 10px 14px;
  border-top: var(--about-line);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-60);
}

/* ---------- 团队 ---------- */

.page-about .about-team__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-team__total {
  padding-left: 18px;
  border-left: 8px solid var(--ember);
}

.page-about .about-team__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(56px, 9vw, 96px);
  font-weight: 800;
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--ink);
}

.page-about .about-team__unit {
  display: block;
  margin-top: 10px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--steel);
}

.page-about .about-team__note {
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-60);
}

.page-about .about-team__roles {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--about-line);
}

.page-about .about-team__role {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 12px;
  padding: 18px 0;
  border-bottom: 1px solid var(--ink-12);
}

.page-about .about-team__count {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-team__role h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-team__role p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-60);
}

/* ---------- 时间带 ---------- */

.page-about .about-section--ink {
  background: var(--ink);
  color: var(--paper);
  border-top: var(--about-line);
  border-bottom: var(--about-line);
}

.page-about .about-section--ink .about-head__title {
  color: var(--paper);
}

.page-about .about-section--ink .about-head__text {
  color: var(--paper-66);
}

.page-about .about-timeline__jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 30px;
}

.page-about .about-timeline__jump a {
  display: inline-block;
  padding: 6px 12px;
  border: 1px solid var(--paper-45);
  color: var(--paper-80);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-decoration: none;
  transition: background var(--ease), color var(--ease), border-color var(--ease);
}

.page-about .about-timeline__jump a:hover,
.page-about .about-timeline__jump a:focus-visible {
  background: var(--jade);
  border-color: var(--jade);
  color: #06231f;
}

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

.page-about .about-ms {
  position: relative;
  padding: 0 0 30px 32px;
  border-left: 2px solid var(--paper-45);
  scroll-margin-top: 110px;
}

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

.page-about .about-ms::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 4px;
  width: 12px;
  height: 12px;
  background: var(--sand);
  border: 2px solid var(--ink);
  transition: background var(--ease), transform var(--ease);
}

.page-about .about-ms:hover::before {
  background: var(--jade);
  transform: scale(1.3);
}

.page-about .about-ms__year {
  display: block;
  margin-bottom: 8px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--sand);
  transition: color var(--ease);
}

.page-about .about-ms:hover .about-ms__year {
  color: var(--jade);
}

.page-about .about-ms__title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-ms__text {
  margin: 0;
  max-width: 40ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--paper-66);
}

/* ---------- 原则 ---------- */

.page-about .about-principles__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-principle {
  padding: 20px 0 24px 20px;
  border-left: 6px solid var(--jade);
  border-bottom: 1px solid var(--ink-12);
}

.page-about .about-principle__no {
  display: block;
  margin-bottom: 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--clay);
}

.page-about .about-principle__title {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-principle__text {
  margin: 0;
  max-width: 42ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-80);
}

/* ---------- 收尾入口 ---------- */

.page-about .about-cta {
  padding: clamp(36px, 5vw, 64px) 0;
  background: var(--sand);
  border-top: var(--about-line);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 24px;
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-90);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-team__role {
    grid-template-columns: 72px 1fr;
    gap: 18px;
  }

  .page-about .about-steps {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .page-about .about-principles__list {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .page-about .about-principle {
    border-bottom: 0;
    padding: 4px 18px 6px 18px;
  }
}

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-stats__item {
    border-bottom: 0;
    border-right: 1px solid var(--ink-12);
  }

  .page-about .about-stats__item:nth-child(2n) {
    border-right: 1px solid var(--ink-12);
  }

  .page-about .about-stats__item:last-child {
    border-right: 0;
  }

  .page-about .about-head {
    grid-template-columns: 6fr 6fr;
    align-items: end;
    gap: 32px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .about-origin__grid {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

  .page-about .about-origin__aside {
    position: sticky;
    top: 110px;
  }

  .page-about .about-team__grid {
    grid-template-columns: 4fr 8fr;
    align-items: start;
  }

  .page-about .about-track {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    border-top: 2px solid var(--paper-45);
  }

  .page-about .about-ms {
    padding: 32px 18px 0 0;
    border-left: 0;
    border-right: 1px dashed var(--paper-15);
  }

  .page-about .about-ms:last-child {
    padding-right: 0;
    border-right: 0;
  }

  .page-about .about-ms::before {
    left: 0;
    top: -7px;
  }

  .page-about .about-ms__text {
    max-width: none;
  }

  .page-about .about-cta__inner {
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
  }
}
<<<END>>>