.page-about {
  --about-rail-w: 15rem;
  --about-gap: clamp(1.5rem, 4vw, 3.5rem);
  background: var(--pitch);
  color: var(--warm);
}

.page-about .about-cover {
  position: relative;
  overflow: hidden;
  padding-block: clamp(4.5rem, 10vw, 8rem) clamp(2.5rem, 5vw, 4rem);
  background: var(--pitch);
  border-bottom: 1px solid var(--line);
}

.page-about .about-cover__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-cover__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.32;
  filter: saturate(0.7) contrast(1.05);
}

.page-about .about-cover__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(6, 20, 15, 0.62) 0%, rgba(6, 20, 15, 0.88) 62%, var(--pitch) 100%),
    repeating-linear-gradient(90deg, rgba(221, 231, 223, 0.05) 0 1px, transparent 1px 96px);
}

.page-about .about-cover__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-cover__eyebrow {
  color: var(--grass);
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-cover__title {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 0.98;
  font-size: clamp(2.1rem, 6.4vw, 4.4rem);
  margin: 0.7rem 0 0;
  max-width: 18ch;
  color: var(--warm);
  text-wrap: balance;
}

.page-about .about-cover__lede {
  margin: clamp(1rem, 2.5vw, 1.6rem) 0 0;
  max-width: 52ch;
  font-size: clamp(1rem, 1.6vw, 1.125rem);
  line-height: 1.8;
  color: var(--cool);
}

.page-about .about-cover__foot {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: clamp(1.5rem, 3.5vw, 2.4rem);
}

.page-about .about-toc {
  margin-top: clamp(2.5rem, 6vw, 4rem);
  padding-top: 1.25rem;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-toc__title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mist);
  margin: 0 0 1rem;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.15rem;
}

.page-about .about-toc__link {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--line-soft);
  color: var(--warm);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s var(--ease), padding-left 0.2s var(--ease);
}

.page-about .about-toc__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.8rem;
  color: var(--amber);
  min-width: 1.8rem;
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--grass);
  padding-left: 0.3rem;
}

.page-about .about-toc__link:focus-visible {
  outline: 2px solid var(--grass);
  outline-offset: 3px;
}

.page-about .about-chapter {
  padding-block: clamp(3rem, 7vw, 5.5rem);
  border-bottom: 1px solid var(--line);
}

.page-about .about-chapter--alt {
  background: var(--stand);
}

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

.page-about .about-chapter__rail {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.75rem 1rem;
  border-left: 2px solid var(--grass);
  padding-left: 1rem;
}

.page-about .about-chapter__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(2.4rem, 7vw, 3.6rem);
  line-height: 1;
  color: var(--grass);
  letter-spacing: -0.04em;
}

.page-about .about-chapter__label {
  margin: 0;
  font-family: var(--font-editorial);
  font-size: 0.95rem;
  color: var(--warm);
}

.page-about .about-chapter__note {
  flex-basis: 100%;
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-chapter__title {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.035em;
  line-height: 1.05;
  font-size: clamp(1.6rem, 4vw, 2.5rem);
  margin: 0 0 1rem;
  color: var(--warm);
  text-wrap: balance;
}

.page-about .about-chapter__text {
  margin: 0 0 1.1rem;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--cool);
}

.page-about .about-chapter__linkline {
  margin: 1.75rem 0 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.95rem;
}

.page-about .about-chapter__sep {
  color: var(--line-strong);
}

.page-about .about-inline-link {
  color: var(--grass);
  text-decoration: none;
  border-bottom: 1px solid rgba(184, 255, 61, 0.4);
  padding-bottom: 1px;
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  border-bottom-color: var(--grass);
}

.page-about .about-inline-link:focus-visible {
  outline: 2px solid var(--grass);
  outline-offset: 3px;
}

/* 原则 */
.page-about .about-principles {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-principle {
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  gap: 0.4rem;
}

.page-about .about-principle__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--amber);
}

.page-about .about-principle__title {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--warm);
  letter-spacing: -0.01em;
}

.page-about .about-principle__text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--mist);
  max-width: 60ch;
}

/* 方法 */
.page-about .about-method {
  margin-top: 1.75rem;
  padding: 1.35rem 1.15rem;
  background: rgba(22, 62, 43, 0.42);
  border: 1px solid var(--line);
  border-left: 2px solid var(--grass);
}

.page-about .about-method__tag {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--grass);
}

.page-about .about-method__title {
  margin: 0 0 0.7rem;
  font-size: clamp(1.1rem, 2.4vw, 1.35rem);
  font-weight: 700;
  color: var(--warm);
  letter-spacing: -0.015em;
}

.page-about .about-method__text {
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--cool);
  max-width: 62ch;
}

.page-about .about-method__text--sub {
  margin-bottom: 0;
  font-size: 0.85rem;
  color: var(--mist);
  border-top: 1px dashed var(--line-strong);
  padding-top: 0.7rem;
}

.page-about .about-method__link-line {
  margin: 0.9rem 0 0;
  font-size: 0.9rem;
}

.page-about .about-method__strip {
  display: grid;
  gap: 0.4rem;
  margin-top: 1rem;
}

.page-about .about-method__bar {
  position: relative;
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.7rem;
  color: var(--pitch);
  background: linear-gradient(90deg, var(--grass) 0%, var(--amber) 100%);
  padding: 0.2rem 0.5rem;
  width: var(--w);
  min-width: 5.5rem;
  border-radius: 0;
  opacity: 0.85;
}

.page-about .about-method__bar:nth-child(4),
.page-about .about-method__bar:nth-child(5) {
  background: linear-gradient(90deg, var(--amber) 0%, var(--hot) 100%);
}

/* 引文 */
.page-about .about-quote {
  background: var(--ink);
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
  border-bottom: 1px solid var(--line);
}

.page-about .about-quote__inner {
  max-width: 56rem;
  position: relative;
}

.page-about .about-quote__mark {
  font-family: var(--font-editorial);
  font-size: 4rem;
  line-height: 0.6;
  color: var(--grass);
  margin: 0 0 0.5rem;
}

.page-about .about-quote__text {
  margin: 0;
  font-family: var(--font-editorial);
  font-weight: 500;
  font-size: clamp(1.25rem, 3.2vw, 1.9rem);
  line-height: 1.6;
  color: var(--warm);
  text-wrap: balance;
}

.page-about .about-quote__cite {
  margin: 1.25rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--mist);
}

/* 图片 */
.page-about .about-figure {
  margin: 1.75rem 0 0;
  border: 1px solid var(--line);
  background: var(--ink);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 12 / 7;
}

.page-about .about-figure--wide img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure__caption {
  margin: 0;
  padding: 0.7rem 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--mist);
  border-top: 1px solid var(--line);
}

/* 时间线 */
.page-about .about-timeline {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0 0 0 1.15rem;
  border-left: 1px solid var(--line-strong);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 0.6rem;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1.15rem - 4px);
  top: 0.85rem;
  width: 7px;
  height: 7px;
  background: var(--grass);
}

.page-about .about-timeline__details {
  border-bottom: 1px solid var(--line);
}

.page-about .about-timeline__summary {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.35rem 0.9rem;
  padding: 0.85rem 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-timeline__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  color: var(--grass);
  font-size: 1.1rem;
  line-height: 1;
}

.page-about .about-timeline__details[open] .about-timeline__summary::after {
  content: "−";
}

.page-about .about-timeline__summary:focus-visible {
  outline: 2px solid var(--grass);
  outline-offset: 3px;
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.85rem;
  color: var(--amber);
  min-width: 4.2rem;
}

.page-about .about-timeline__head {
  font-size: 1rem;
  font-weight: 700;
  color: var(--warm);
}

.page-about .about-timeline__body {
  margin: 0 0 1rem;
  padding-right: 0.5rem;
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--mist);
  max-width: 60ch;
}

/* 团队数字 */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 1.6rem 0;
  background: var(--line-strong);
  border: 1px solid var(--line-strong);
}

.page-about .about-stat {
  background: var(--stand);
  padding: 1.1rem 0.9rem;
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(1.8rem, 5vw, 2.4rem);
  line-height: 1;
  color: var(--amber);
  letter-spacing: -0.03em;
}

.page-about .about-stat__unit {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--warm);
  margin-left: 0.2rem;
}

.page-about .about-stat__label {
  margin: 0.55rem 0 0;
  font-size: 0.82rem;
  color: var(--mist);
  line-height: 1.5;
}

/* 场景 */
.page-about .about-scenes {
  display: grid;
  gap: 1px;
  margin-top: 1.5rem;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-scene {
  background: var(--pitch);
  padding: 1.25rem 1.05rem;
}

.page-about .about-scene__tag {
  margin: 0 0 0.55rem;
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--pitch);
  background: var(--grass);
  padding: 0.15rem 0.5rem;
}

.page-about .about-scene__title {
  margin: 0 0 0.55rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--warm);
  line-height: 1.45;
}

.page-about .about-scene__text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--mist);
}

/* 工作方式 */
.page-about .about-workflow {
  margin-top: 1.9rem;
  border-top: 1px solid var(--line-strong);
  padding-top: 1.3rem;
}

.page-about .about-workflow__title {
  margin: 0 0 0.9rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--warm);
}

.page-about .about-workflow__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.page-about .about-workflow__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.2rem;
  padding-left: 0.9rem;
  border-left: 1px solid var(--line-strong);
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-workflow__step {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--grass);
}

/* 信任带 */
.page-about .about-trust {
  background: var(--ink);
  padding-block: clamp(3rem, 7vw, 5rem);
}

.page-about .about-trust__inner {
  display: grid;
  gap: 1.75rem;
}

.page-about .about-trust__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2rem, 5vw, 2.8rem);
  color: var(--grass);
  letter-spacing: -0.04em;
  line-height: 1;
}

.page-about .about-trust__title {
  margin: 0.6rem 0 0.8rem;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.035em;
  line-height: 1.08;
  font-size: clamp(1.5rem, 3.6vw, 2.2rem);
  color: var(--warm);
  text-wrap: balance;
}

.page-about .about-trust__text {
  margin: 0;
  max-width: 54ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-trust__list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-trust__row {
  display: grid;
  gap: 0.2rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-trust__key {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .about-trust__val {
  margin: 0;
  font-size: 0.98rem;
  color: var(--warm);
  word-break: break-word;
}

.page-about .about-trust__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

@media (min-width: 720px) {
  .page-about .about-toc__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 2rem;
  }

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

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

  .page-about .about-principle {
    grid-template-columns: 8rem minmax(0, 1fr);
    grid-template-areas:
      "num title"
      "num text";
    column-gap: 1.5rem;
    align-items: start;
  }

  .page-about .about-principle__num { grid-area: num; padding-top: 0.3rem; }
  .page-about .about-principle__title { grid-area: title; }
  .page-about .about-principle__text { grid-area: text; }

  .page-about .about-workflow__item {
    grid-template-columns: 10rem minmax(0, 1fr);
    gap: 1rem;
    align-items: baseline;
  }

  .page-about .about-trust__row {
    grid-template-columns: 9rem minmax(0, 1fr);
    gap: 1rem;
    align-items: baseline;
    padding: 0.9rem 0;
  }
}

@media (min-width: 960px) {
  .page-about .about-chapter__grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .about-chapter__rail {
    display: block;
    border-left: 2px solid var(--grass);
    padding-left: 1.25rem;
    position: sticky;
    top: 6rem;
    align-self: start;
  }

  .page-about .about-chapter__note {
    margin-top: 1rem;
    max-width: 14rem;
  }

  .page-about .about-cover__inner {
    display: grid;
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    column-gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
  }

  .page-about .breadcrumb,
  .page-about .about-cover__eyebrow,
  .page-about .about-cover__title,
  .page-about .about-cover__lede,
  .page-about .about-cover__foot {
    grid-column: 1;
  }

  .page-about .about-toc {
    grid-column: 2;
    grid-row: 1 / span 6;
    margin-top: 0;
    padding-top: 0;
    border-top: none;
    border-left: 1px solid var(--line-strong);
    padding-left: 1.5rem;
  }

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

  .page-about .about-method {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-method__strip {
    margin-top: 1.25rem;
  }

  .page-about .about-trust__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    column-gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
  }

  .page-about .about-trust__actions {
    grid-column: 1 / -1;
    margin-top: 0.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--line);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__link {
    transition: none;
  }
  .page-about .about-toc__link:hover,
  .page-about .about-toc__link:focus-visible {
    padding-left: 0;
    color: var(--grass);
  }
}
<<<END>>>

.page-about {
  --w: 1rem;
}