.page-about {
  --about-line: rgba(33, 24, 21, 0.16);
  --about-grid: rgba(90, 42, 30, 0.07);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-mono);
}

.page-about .about-crumb-row {
  padding-top: 18px;
  padding-bottom: 4px;
}

.page-about .about-crumb-row .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--lake);
}

.page-about .about-crumb-row .crumbs a {
  color: var(--clay-deep);
  text-decoration: none;
  border-bottom: 2px solid transparent;
}

.page-about .about-crumb-row .crumbs a:hover,
.page-about .about-crumb-row .crumbs a:focus-visible {
  border-bottom-color: var(--alert);
}

/* ---------- 封面 ---------- */
.page-about .about-cover {
  position: relative;
  padding: 24px 0 46px;
  background-image:
    repeating-linear-gradient(0deg, transparent 0 31px, var(--about-grid) 31px 32px),
    repeating-linear-gradient(90deg, transparent 0 31px, var(--about-grid) 31px 32px);
}

.page-about .about-cover__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-cover__lead h1 {
  margin: 10px 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 8.4vw, 4.2rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-wrap: balance;
}

.page-about .about-cover__dek {
  max-width: 36em;
  margin: 0 0 20px;
  padding-left: 16px;
  border-left: 4px solid var(--clay);
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-cover__meta {
  display: inline-block;
  margin: 0;
  padding: 8px 12px;
  border: 2px solid var(--clay-deep);
  background: var(--card);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--clay-deep);
}

.page-about .about-toc {
  align-self: start;
  padding: 18px 18px 20px;
  border: 3px solid var(--clay-deep);
  background: var(--card);
  box-shadow: var(--shadow-sm);
}

.page-about .about-toc__title {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--lake);
}

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

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

.page-about .about-toc__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 11px 0;
  color: var(--ink);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.5;
  transition: color 140ms ease, padding-left 140ms ease;
}

.page-about .about-toc__list a span {
  font-weight: 700;
  font-size: 12px;
  color: var(--clay);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--clay);
  padding-left: 6px;
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  padding: 42px 0 46px;
  border-top: 3px solid var(--clay-deep);
  background: linear-gradient(180deg, rgba(216, 225, 223, 0.35) 0%, rgba(246, 237, 223, 0) 70%);
}

.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: start;
}

.page-about .about-origin__figure {
  margin: 0;
  border: 3px solid var(--clay-deep);
  background: var(--card);
  box-shadow: var(--shadow-sm);
}

.page-about .about-origin__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.02);
}

.page-about .about-origin__figure figcaption,
.page-about .about-model__figure figcaption,
.page-about .about-reach__figure figcaption {
  padding: 9px 12px;
  border-top: 2px solid var(--clay-deep);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--lake);
}

.page-about .about-origin__text p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
}

.page-about .about-pull {
  margin: 24px 0 0;
  padding: 18px 20px;
  border: 0;
  border-left: 8px solid var(--clay);
  background: var(--card);
  box-shadow: var(--shadow-sm);
}

.page-about .about-pull p {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.15rem, 4.4vw, 1.6rem);
  line-height: 1.42;
  color: var(--clay-deep);
  text-wrap: balance;
}

/* ---------- 双核模型 ---------- */
.page-about .about-model {
  padding: 44px 0 48px;
  background: var(--clay-deep);
  color: var(--card);
}

.page-about .about-model .eyebrow {
  color: var(--watch);
}

.page-about .about-model .eyebrow::before {
  background: var(--watch);
}

.page-about .about-model .section-title {
  color: var(--card);
  border-left-color: var(--alert);
}

.page-about .about-model__intro {
  max-width: 44em;
  margin: 0 0 26px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(255, 249, 239, 0.86);
}

.page-about .about-model__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-core {
  padding: 22px 20px 24px;
  border: 3px solid var(--ink);
  background: var(--card);
  color: var(--ink);
  box-shadow: 6px 6px 0 var(--alert);
}

.page-about .about-core--nav {
  box-shadow: 6px 6px 0 var(--lake);
}

.page-about .about-core__tag {
  display: inline-block;
  margin: 0 0 12px;
  padding: 4px 10px;
  background: var(--clay);
  color: var(--card);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.page-about .about-core--nav .about-core__tag {
  background: var(--lake);
}

.page-about .about-core h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.28rem;
  line-height: 1.32;
  color: var(--clay-deep);
}

.page-about .about-core p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.82;
}

.page-about .about-core__list {
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
}

.page-about .about-core__list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 8px;
  font-size: 14px;
  line-height: 1.7;
}

.page-about .about-core__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 9px;
  height: 9px;
  border: 2px solid var(--clay);
  background: var(--alert);
}

.page-about .about-model__figure {
  margin: 0;
  border: 3px solid var(--ink);
  background: var(--card);
  box-shadow: 6px 6px 0 var(--mist);
}

.page-about .about-model__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 5 / 6;
  object-fit: cover;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: 46px 0 48px;
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 8px;
}

.page-about .about-stat {
  padding: 20px 18px;
  border: 3px solid var(--clay-deep);
  background: var(--card);
}

.page-about .about-stat__num {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 8vw, 2.6rem);
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--clay);
}

.page-about .about-stat__label {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-stat--dark {
  background: var(--clay-deep);
  border-color: var(--ink);
}

.page-about .about-stat--dark .about-stat__num {
  color: var(--alert);
}

.page-about .about-stat--dark .about-stat__label {
  color: var(--card);
}

.page-about .about-stat--clay {
  background: var(--clay);
  border-color: var(--ink);
}

.page-about .about-stat--clay .about-stat__num,
.page-about .about-stat--clay .about-stat__label {
  color: var(--card);
}

.page-about .about-stat--lake {
  background: var(--lake);
  border-color: var(--ink);
}

.page-about .about-stat--lake .about-stat__num,
.page-about .about-stat--lake .about-stat__label {
  color: var(--card);
}

.page-about .about-stat--photo {
  padding: 0;
  overflow: hidden;
}

.page-about .about-stat--photo img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-stat__cap {
  margin: 0;
  padding: 9px 14px;
  border-top: 2px solid var(--clay-deep);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--lake);
}

.page-about .about-roles {
  margin-top: 26px;
  padding: 20px 18px 22px;
  border: 3px solid var(--clay-deep);
  background: var(--mist);
}

.page-about .about-roles__title {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--clay-deep);
}

.page-about .about-role + .about-role {
  margin-top: 10px;
}

.page-about .about-role__trigger {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  width: 100%;
  padding: 13px 14px;
  border: 2px solid var(--clay-deep);
  background: var(--card);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: background 140ms ease, transform 140ms ease;
}

.page-about .about-role__trigger:hover,
.page-about .about-role__trigger:focus-visible {
  background: #ffffff;
  transform: translateX(3px);
}

.page-about .about-role__num {
  font-size: 12px;
  font-weight: 700;
  color: var(--clay);
}

.page-about .about-role__name {
  flex: 1 1 auto;
}

.page-about .about-role__hint {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--lake);
}

.page-about .about-role__trigger[aria-expanded="true"] .about-role__hint {
  color: var(--clay);
}

.page-about .about-role__panel {
  margin-top: -2px;
  padding: 14px 16px;
  border: 2px solid var(--clay-deep);
  border-top: 0;
  background: var(--card);
}

.page-about .about-role__panel p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
}

/* ---------- 覆盖 ---------- */
.page-about .about-reach {
  padding: 44px 0 48px;
  border-top: 3px solid var(--clay-deep);
  background: var(--paper);
}

.page-about .about-reach__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: start;
}

.page-about .about-reach__text p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
}

.page-about .about-reach__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-reach__list li {
  padding: 12px 12px;
  border: 2px solid var(--clay-deep);
  background: var(--card);
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink);
}

.page-about .about-reach__list strong {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.24rem;
  color: var(--clay);
  margin-bottom: 2px;
}

.page-about .about-reach__figure {
  margin: 0;
  border: 3px solid var(--clay-deep);
  background: var(--card);
  box-shadow: var(--shadow-sm);
}

.page-about .about-reach__svg {
  display: block;
  width: 100%;
  height: auto;
  background: var(--mist);
}

/* ---------- 流程 ---------- */
.page-about .about-process {
  padding: 44px 0 48px;
  background: linear-gradient(180deg, rgba(216, 225, 223, 0.45) 0%, rgba(246, 237, 223, 0) 55%);
}

.page-about .about-process__intro {
  max-width: 46em;
  margin: 0 0 26px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
}

.page-about .about-step {
  position: relative;
  padding-left: 46px;
  margin-bottom: 12px;
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 40px;
  bottom: -12px;
  width: 2px;
  background: var(--clay-deep);
  opacity: 0.32;
}

.page-about .about-step:last-child::before {
  display: none;
}

.page-about .about-step__num {
  position: absolute;
  left: 0;
  top: 8px;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border: 3px solid var(--clay-deep);
  border-radius: 50%;
  background: var(--card);
  font-size: 12px;
  font-weight: 700;
  color: var(--clay-deep);
  z-index: 1;
}

.page-about .about-step__trigger {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  width: 100%;
  padding: 14px 16px;
  border: 3px solid var(--clay-deep);
  background: var(--card);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
  transition: box-shadow 150ms ease, border-color 150ms ease;
}

.page-about .about-step__trigger:hover,
.page-about .about-step__trigger:focus-visible {
  border-color: var(--clay);
  box-shadow: var(--shadow-sm);
}

.page-about .about-step__trigger[aria-expanded="true"] {
  background: var(--clay-deep);
  color: var(--card);
  border-color: var(--clay-deep);
}

.page-about .about-step__trigger[aria-expanded="true"] .about-step__hint {
  color: var(--watch);
}

.page-about .about-step__name {
  flex: 1 1 auto;
}

.page-about .about-step__hint {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--lake);
}

.page-about .about-step__panel {
  padding: 14px 16px;
  border: 3px solid var(--clay-deep);
  border-top: 0;
  background: var(--mist);
}

.page-about .about-step__panel p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-cadence {
  margin-top: 28px;
  padding: 22px 20px 24px;
  border: 3px solid var(--ink);
  background: var(--card);
  box-shadow: 6px 6px 0 var(--clay);
}

.page-about .about-cadence__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.18rem, 4.6vw, 1.5rem);
  line-height: 1.35;
  color: var(--clay-deep);
}

.page-about .about-cadence p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.85;
}

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

/* ---------- 下一步 ---------- */
.page-about .about-talk {
  padding: 44px 0 52px;
  border-top: 3px solid var(--clay-deep);
}

.page-about .about-talk__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 8px;
}

.page-about .about-talk__card {
  display: block;
  padding: 20px 18px 22px;
  border: 3px solid var(--clay-deep);
  background: var(--card);
  color: var(--ink);
  text-decoration: none;
  transition: transform 150ms ease, box-shadow 150ms ease;
}

.page-about .about-talk__card:hover,
.page-about .about-talk__card:focus-visible {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-sm);
}

.page-about .about-talk__card--accent {
  background: var(--clay);
  border-color: var(--ink);
}

.page-about .about-talk__card--accent h3,
.page-about .about-talk__card--accent p,
.page-about .about-talk__card--accent .about-talk__idx,
.page-about .about-talk__card--accent .about-talk__go {
  color: var(--card);
}

.page-about .about-talk__idx {
  margin: 0 0 10px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--clay);
}

.page-about .about-talk__card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.18rem;
  line-height: 1.35;
  color: var(--clay-deep);
}

.page-about .about-talk__card p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.78;
}

.page-about .about-talk__go {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--lake);
  border-bottom: 2px solid var(--alert);
}

.page-about .about-tipnote {
  margin: 28px 0 0;
  padding: 12px 14px;
  border-left: 6px solid var(--alert);
  background: var(--mist);
  font-size: 13px;
  line-height: 1.7;
  color: var(--clay-deep);
}

.page-about .about-tipnote a {
  color: var(--clay);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--clay);
}

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-cover {
    padding: 40px 0 66px;
  }

  .page-about .about-cover__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.78fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-cover__lead {
    padding-left: 18px;
  }

  .page-about .about-toc {
    position: sticky;
    top: 22px;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 38px;
  }

  .page-about .about-model__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.72fr) minmax(0, 1fr);
    align-items: stretch;
    gap: 20px;
  }

  .page-about .about-model__figure img {
    aspect-ratio: auto;
    height: 100%;
  }

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

  .page-about .about-reach__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 40px;
  }

  .page-about .about-timeline {
    padding-left: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__list a,
  .page-about .about-role__trigger,
  .page-about .about-step__trigger,
  .page-about .about-talk__card {
    transition: none;
  }

  .page-about .about-role__trigger:hover,
  .page-about .about-talk__card:hover {
    transform: none;
  }
}
<<<END>>>