.page-about {
  --about-line: rgba(36, 28, 22, 0.16);
  --about-line-dark: rgba(201, 194, 182, 0.24);
  --about-block: clamp(34px, 7vw, 76px);
  background: var(--cream);
  color: var(--ink);
  overflow-x: hidden;
}

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

.page-about .about-inline-link {
  color: var(--flame);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
}

.page-about .about-inline-link:hover {
  color: var(--ink);
}

.page-about .about-inline-link--neon {
  color: var(--neon);
}

.page-about .about-inline-link--neon:hover {
  color: var(--paper);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 5vw, 40px) 0 clamp(30px, 6vw, 64px);
  background:
    radial-gradient(130% 150% at 8% 0%, #123f3b 0%, var(--forest) 46%, #071e1d 100%);
  color: var(--paper);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(to right, rgba(201, 194, 182, 0.07) 0 1px, transparent 1px 52px),
    repeating-linear-gradient(to bottom, rgba(201, 194, 182, 0.07) 0 1px, transparent 1px 52px);
  pointer-events: none;
}

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

.page-about .about-hero__frame {
  position: relative;
  border: 1px solid rgba(201, 194, 182, 0.3);
  padding: clamp(20px, 4vw, 40px);
}

.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
}

.page-about .about-hero__frame::before {
  top: -1px;
  left: -1px;
  border-top: 3px solid var(--neon);
  border-left: 3px solid var(--neon);
}

.page-about .about-hero__frame::after {
  right: -1px;
  bottom: -1px;
  border-right: 3px solid var(--flame);
  border-bottom: 3px solid var(--flame);
}

.page-about .about-hero__eyebrow {
  color: var(--neon);
  margin: 0 0 14px;
}

.page-about .about-hero__title {
  margin: 0;
  font-size: clamp(1.75rem, 5.6vw, 3.15rem);
  line-height: 1.16;
  letter-spacing: -0.04em;
  font-weight: 900;
  max-width: 22ch;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 44em;
  font-size: var(--fz-16);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-hero__actions {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__stats {
  margin: 30px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--about-line-dark);
  border-left: 1px solid var(--about-line-dark);
}

.page-about .about-stat {
  padding: 14px 12px 16px;
  border-right: 1px solid var(--about-line-dark);
  border-bottom: 1px solid var(--about-line-dark);
}

.page-about .about-stat__label {
  font-size: var(--fz-12);
  letter-spacing: 0.12em;
  color: var(--mist);
  margin: 0;
}

.page-about .about-stat__num {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4.4vw, 2.35rem);
  line-height: 1;
  color: var(--flame);
  letter-spacing: -0.02em;
}

.page-about .about-stat__num span {
  font-size: 0.6em;
  vertical-align: super;
}

/* ---------- 刻度条 ---------- */
.page-about .about-scale {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  height: 18px;
  padding: 0 var(--gutter);
  background: var(--forest);
  border-bottom: 1px solid var(--steel);
}

.page-about .about-scale__tick {
  width: 1px;
  height: 8px;
  background: var(--mist);
  opacity: 0.5;
}

.page-about .about-scale__tick:nth-child(3n) {
  height: 14px;
  background: var(--flame);
  opacity: 1;
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  padding: var(--about-block) 0;
  border-bottom: 1px solid var(--about-line);
}

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

.page-about .about-chapter--dark {
  background: var(--forest);
  color: var(--paper);
  border-bottom: 1px solid var(--steel);
}

.page-about .about-chapter--carbon {
  background: var(--carbon);
  color: var(--paper);
}

.page-about .about-chapter__inner {
  display: grid;
  gap: 18px;
}

.page-about .about-chapter__mark {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: var(--fz-28);
  line-height: 1;
  color: var(--flame);
  letter-spacing: -0.03em;
}

.page-about .about-chapter__title {
  margin: 0 0 16px;
  font-size: clamp(1.35rem, 3.6vw, 2.05rem);
  line-height: 1.28;
  letter-spacing: -0.03em;
  font-weight: 900;
  max-width: 24ch;
}

.page-about .about-chapter__text {
  margin: 0 0 14px;
  font-size: var(--fz-16);
  line-height: 1.8;
  max-width: 40em;
  color: var(--ink);
}

.page-about .about-chapter--dark .about-chapter__text,
.page-about .about-chapter--carbon .about-chapter__text,
.page-about .about-chapter__text--onDark {
  color: var(--mist);
}

.page-about .about-chapter__body > .about-chapter__text:last-child {
  margin-bottom: 0;
}

/* ---------- 起点章节 ---------- */
.page-about .about-lead-grid {
  display: grid;
  gap: 24px;
}

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

.page-about .about-figure__media {
  border: 1px solid var(--about-line);
  background: var(--forest);
}

.page-about .about-figure__media img {
  width: 100%;
  height: clamp(190px, 42vw, 320px);
  object-fit: cover;
}

.page-about .media--skew {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .about-figure .media__caption {
  margin-top: 10px;
  font-size: var(--fz-12);
  line-height: 1.7;
  color: #5b5049;
  letter-spacing: 0.02em;
}

.page-about .about-chapter--dark .media__caption,
.page-about .about-chapter--carbon .media__caption {
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__list {
  list-style: none;
  margin: 24px 0 26px;
  padding: 0;
  position: relative;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 15px;
  width: 1px;
  background: var(--about-line);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 44px;
  margin-bottom: 16px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 18px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--cream);
  border: 2px solid var(--flame);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fz-20);
  line-height: 1;
  color: var(--flame);
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.page-about .about-timeline__card {
  display: block;
  padding: 14px 18px 16px;
  text-decoration: none;
  color: inherit;
  background: #fffdf7;
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.page-about .about-timeline__card:hover,
.page-about .about-timeline__card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--flame);
  box-shadow: inset 3px 0 0 var(--flame);
}

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

.page-about .about-timeline__tag {
  display: inline-block;
  font-size: var(--fz-12);
  letter-spacing: 0.14em;
  color: var(--steel);
  margin-bottom: 6px;
}

.page-about .about-timeline__title {
  display: block;
  font-size: var(--fz-20);
  line-height: 1.4;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}

.page-about .about-timeline__text {
  display: block;
  font-size: var(--fz-14);
  line-height: 1.75;
  color: #4a4039;
}

.page-about .about-figure--band {
  margin-top: 8px;
}

/* ---------- 方法 ---------- */
.page-about .about-method__list {
  margin: 8px 0 18px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-method__row {
  display: grid;
  gap: 6px;
  padding: 14px 0 16px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-method__key {
  font-family: var(--font-mono);
  font-size: var(--fz-14);
  letter-spacing: 0.08em;
  color: var(--flame);
}

.page-about .about-method__val {
  margin: 0;
  font-size: var(--fz-16);
  line-height: 1.75;
  color: var(--ink);
  max-width: 42em;
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 12px;
  margin: 20px 0 26px;
}

.page-about .about-role {
  border: 1px solid var(--about-line);
  background: var(--cream);
  padding: 16px 18px 18px;
  position: relative;
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.page-about .about-role:hover,
.page-about .about-role:focus-visible {
  transform: translateY(-2px);
  border-color: var(--steel);
  box-shadow: inset 3px 0 0 var(--flame);
}

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

.page-about .about-role__num {
  font-family: var(--font-mono);
  font-size: var(--fz-40);
  line-height: 1;
  color: var(--steel);
  letter-spacing: -0.03em;
}

.page-about .about-role__title {
  margin: 6px 0 8px;
  font-size: var(--fz-20);
  letter-spacing: -0.01em;
}

.page-about .about-role__duty {
  margin: 0;
  font-size: var(--fz-14);
  line-height: 1.75;
  color: #4a4039;
}

.page-about .about-role__more {
  margin: 0;
  font-size: var(--fz-14);
  line-height: 1.75;
  color: var(--steel);
  border-top: 1px dashed var(--about-line);
  padding-top: 8px;
  margin-top: 10px;
}

/* ---------- 服务范围 ---------- */
.page-about .about-cover__grid {
  display: grid;
  gap: 1px;
  margin: 22px 0 20px;
  background: var(--about-line-dark);
  border: 1px solid var(--about-line-dark);
}

.page-about .about-cover__card {
  background: var(--forest);
  padding: 20px 18px 22px;
}

.page-about .about-cover__big {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 7vw, 3rem);
  line-height: 1;
  color: var(--neon);
  letter-spacing: -0.04em;
  margin-bottom: 10px;
}

.page-about .about-cover__title {
  margin: 0 0 8px;
  font-size: var(--fz-20);
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-about .about-cover__text {
  margin: 0;
  font-size: var(--fz-14);
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 认证 ---------- */
.page-about .about-seals {
  display: grid;
  gap: 12px;
  margin: 22px 0 28px;
}

.page-about .about-seal {
  display: block;
  position: relative;
  padding: 14px 16px 16px;
  border: 1px dashed var(--about-line-dark);
  background: rgba(255, 249, 239, 0.04);
  cursor: help;
  transition: border-color 0.18s ease, background 0.18s ease;
}

.page-about .about-seal:hover,
.page-about .about-seal:focus {
  border-color: var(--signal);
  background: rgba(255, 249, 239, 0.08);
}

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

.page-about .about-seal__mark {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fz-12);
  letter-spacing: 0.16em;
  color: var(--carbon);
  background: var(--signal);
  padding: 2px 8px;
  margin-bottom: 10px;
}

.page-about .about-seal__title {
  display: block;
  font-size: var(--fz-16);
  font-weight: 700;
  color: var(--paper);
  letter-spacing: 0.01em;
}

.page-about .about-seal__note {
  display: block;
  font-size: var(--fz-14);
  line-height: 1.7;
  color: var(--mist);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.28s ease, opacity 0.22s ease, margin-top 0.22s ease;
}

.page-about .about-seal:hover .about-seal__note,
.page-about .about-seal:focus .about-seal__note {
  max-height: 180px;
  opacity: 1;
  margin-top: 10px;
}

.page-about .about-cta {
  display: grid;
  gap: 18px;
  padding-top: 22px;
  border-top: 1px solid var(--about-line-dark);
}

.page-about .about-cta__title {
  margin: 0 0 8px;
  font-size: var(--fz-20);
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-cta__sub {
  margin: 0;
  font-size: var(--fz-14);
  line-height: 1.75;
  color: var(--mist);
  max-width: 40em;
}

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

/* ---------- 桌面增强 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-team__grid .about-role__more {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    padding-top: 0;
    border-top-width: 0;
    overflow: hidden;
    transition: max-height 0.28s ease, opacity 0.22s ease, margin-top 0.22s ease, padding-top 0.22s ease;
  }

  .page-about .about-team__grid .about-role:hover .about-role__more,
  .page-about .about-team__grid .about-role:focus .about-role__more {
    max-height: 200px;
    opacity: 1;
    margin-top: 10px;
    padding-top: 8px;
    border-top-width: 1px;
  }

  .page-about .about-method__row {
    grid-template-columns: 116px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
  }

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

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 980px) {
  .page-about .about-chapter__inner {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .about-chapter__mark {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding-top: 4px;
  }

  .page-about .about-chapter__num {
    font-size: var(--fz-40);
  }

  .page-about .about-lead-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-figure__media img {
    height: 340px;
  }

  .page-about .about-figure--band {
    margin-top: 6px;
    max-width: 860px;
  }

  .page-about .about-timeline__list {
    margin-top: 28px;
  }

  .page-about .about-timeline__item {
    padding-left: 60px;
    margin-bottom: 18px;
  }

  .page-about .about-timeline__list::before {
    left: 21px;
  }

  .page-about .about-timeline__item::before {
    left: 16px;
    top: 22px;
  }

  .page-about .about-timeline__year {
    font-size: var(--fz-28);
    margin-bottom: 10px;
  }

  .page-about .about-timeline__card {
    padding: 18px 24px 20px;
  }

  .page-about .about-hero__frame {
    padding: 44px 48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__card,
  .page-about .about-role,
  .page-about .about-seal,
  .page-about .about-seal__note,
  .page-about .about-role__more {
    transition: none;
  }
}
<<<END>>>