.page-about {
  --about-rail: 188px;
  --about-flow-gap: clamp(20px, 3vw, 40px);
  background: var(--ink-800);
  color: var(--text);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4.6vw, 52px) 0 clamp(38px, 6vw, 78px);
  border-bottom: 1px solid var(--line-2);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -180px;
  right: -140px;
  width: clamp(300px, 46vw, 620px);
  height: clamp(300px, 46vw, 620px);
  border-radius: 48% 52% 62% 38% / 54% 44% 56% 46%;
  background: radial-gradient(circle at 38% 42%, rgba(53, 224, 208, 0.2), rgba(14, 143, 134, 0.06) 58%, transparent 72%);
  pointer-events: none;
}

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

.page-about .about-hero__crumbs {
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .about-hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-hero__eyebrow-line {
  display: block;
  width: 36px;
  height: 1px;
  background: var(--cyan);
  flex: 0 0 auto;
}

.page-about .about-hero__title {
  margin: clamp(16px, 2.6vw, 26px) 0 0;
  max-width: 15em;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(34px, 7.2vw, 66px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-hero__meta {
  display: grid;
  gap: clamp(22px, 3.2vw, 40px);
  margin-top: clamp(24px, 3.6vw, 44px);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 58ch;
  font-family: var(--font-body);
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.85;
  color: var(--text-2);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 18px 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
  gap: 16px 18px;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__num {
  display: block;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(23px, 3.4vw, 32px);
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-hero__fw {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-3);
}

/* ---------- 品牌信条 ---------- */
.page-about .about-creed {
  padding: clamp(26px, 4vw, 46px) 0;
  border-bottom: 1px solid var(--line-2);
}

.page-about .about-creed__quote {
  margin: 0;
  padding-left: clamp(16px, 2.4vw, 26px);
  border-left: 2px solid var(--coral);
}

.page-about .about-creed__text {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.42;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-creed__cite {
  display: block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--text-3);
}

/* ---------- 目录 + 正文布局 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
  padding-top: clamp(32px, 5vw, 68px);
  padding-bottom: clamp(48px, 8vw, 108px);
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--coral);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 2px 16px;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 6px 0;
  font-size: 13.5px;
  color: var(--text-3);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link[aria-current="true"] {
  color: var(--cyan);
  border-bottom-color: var(--line);
}

.page-about .about-rail__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--teal);
}

.page-about .about-rail__link[aria-current="true"] .about-rail__idx {
  color: var(--cyan);
}

.page-about .about-rail__note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-2);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.8;
  letter-spacing: 0.04em;
  color: var(--text-3);
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding-top: clamp(28px, 4.2vw, 48px);
  border-top: 1px solid var(--line-2);
}

.page-about .about-sec + .about-sec {
  margin-top: clamp(34px, 5vw, 62px);
}

.page-about .about-sec__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--coral);
}

.page-about .about-sec__title {
  margin: 12px 0 0;
  max-width: 20em;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(24px, 3.8vw, 38px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-sec__body {
  margin-top: clamp(16px, 2.4vw, 24px);
}

.page-about .about-sec__body p {
  margin: 0 0 15px;
  max-width: 64ch;
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--text-2);
}

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

.page-about .about-sec__note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding-left: 14px;
  border-left: 1px solid var(--line);
  max-width: 66ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--text-3);
}

/* ---------- 三类读者 ---------- */
.page-about .about-cols {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
  margin-top: clamp(22px, 3.2vw, 34px);
}

.page-about .about-cols__item h3 {
  position: relative;
  margin: 0 0 8px;
  padding-left: 15px;
  font-family: var(--font-sans);
  font-size: 16.5px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-cols__item h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.58em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .about-cols__item p {
  margin: 0;
  font-size: 14.8px;
  line-height: 1.8;
  color: var(--text-2);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(22px, 3.4vw, 36px) 0 0;
  padding: 10px;
  border: 1px solid var(--line);
  background: var(--ink-700);
}

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

.page-about .about-figure figcaption {
  padding: 10px 4px 2px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.7;
  letter-spacing: 0.03em;
  color: var(--text-3);
}

/* ---------- 时间线 ---------- */
.page-about .about-tl {
  list-style: none;
  margin: clamp(22px, 3.2vw, 34px) 0 0;
  padding: 0;
}

.page-about .about-tl__item {
  position: relative;
  margin-left: 5px;
  padding: 0 0 clamp(22px, 3vw, 32px) clamp(18px, 2.6vw, 26px);
  border-left: 1px solid rgba(53, 224, 208, 0.24);
}

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

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-800);
  border: 1px solid var(--cyan);
  transition: background 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .about-tl__item:hover::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 224, 208, 0.14);
}

.page-about .about-tl__year {
  display: block;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(18px, 2.4vw, 22px);
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .about-tl__head {
  margin: 6px 0 7px;
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-tl__text {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-2);
}

.page-about .about-tl__sum {
  margin: 10px 0 0;
  padding-top: 9px;
  max-width: 60ch;
  border-top: 1px dashed var(--line-2);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.75;
  letter-spacing: 0.02em;
  color: var(--text-3);
  transition: color 180ms var(--ease);
}

.page-about .about-tl__item:hover .about-tl__sum {
  color: var(--pale);
}

/* ---------- 工作方法 ---------- */
.page-about .about-rules {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
}

.page-about .about-rules__item {
  display: grid;
  gap: 4px;
  padding: clamp(15px, 2.3vw, 22px) 0;
  border-top: 1px solid var(--line-2);
}

.page-about .about-rules__item:last-child {
  border-bottom: 1px solid var(--line-2);
}

.page-about .about-rules__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--coral);
}

.page-about .about-rules__name {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16.5px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-rules__desc {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-2);
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  display: grid;
  gap: 1px;
  margin-top: clamp(20px, 3vw, 30px);
  border: 1px solid var(--line-2);
  background: var(--line-2);
}

.page-about .about-team__cell {
  padding: clamp(17px, 2.5vw, 26px);
  background: var(--ink-800);
}

.page-about .about-team__cell h3 {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-team__cell p {
  margin: 0;
  font-size: 14.6px;
  line-height: 1.78;
  color: var(--text-2);
}

/* ---------- 资质与伙伴（浅色区） ---------- */
.page-about .about-trust {
  position: relative;
  overflow: hidden;
  margin-top: clamp(20px, 3vw, 30px);
  padding: clamp(22px, 3.8vw, 46px);
  border-radius: 22px;
  background: var(--mist);
  color: var(--ink-800);
}

.page-about .about-trust::after {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -100px;
  width: clamp(180px, 26vw, 300px);
  height: clamp(180px, 26vw, 300px);
  border-radius: 46% 54% 62% 38% / 52% 46% 54% 48%;
  background: var(--pale);
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-trust__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(22px, 3.4vw, 38px);
}

.page-about .about-trust__head {
  margin: 0 0 6px;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink-700);
}

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

.page-about .about-trust__list li {
  display: grid;
  gap: 3px;
  padding: 13px 0;
  border-top: 1px solid rgba(6, 24, 38, 0.12);
}

.page-about .about-trust__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--teal);
}

.page-about .about-trust__v {
  font-size: 14.6px;
  line-height: 1.72;
  color: rgba(6, 24, 38, 0.8);
}

/* ---------- 联络与下一步 ---------- */
.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-contact {
  list-style: none;
  margin: clamp(24px, 3.4vw, 38px) 0 0;
  padding: 0;
}

.page-about .about-contact li {
  display: grid;
  gap: 4px;
  padding: 13px 0;
  border-top: 1px solid var(--line-2);
}

.page-about .about-contact__k {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--text-3);
}

.page-about .about-contact__v {
  font-size: 15px;
  line-height: 1.72;
  color: var(--text);
  word-break: break-word;
}

.page-about .about-next {
  display: grid;
  margin-top: clamp(22px, 3.2vw, 34px);
  border-top: 1px solid var(--line-2);
}

.page-about .about-next a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 2px;
  border-bottom: 1px solid var(--line-2);
  font-size: 15px;
  color: var(--text);
  text-decoration: none;
  transition: color 160ms var(--ease), padding-left 160ms var(--ease);
}

.page-about .about-next a:hover {
  color: var(--cyan);
  padding-left: 8px;
}

.page-about .about-next__arrow {
  font-family: var(--font-mono);
  color: var(--teal);
  flex: 0 0 auto;
}

.page-about .about-next a:hover .about-next__arrow {
  color: var(--cyan);
}

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

@media (min-width: 760px) {
  .page-about .about-cols {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-rules__item {
    grid-template-columns: 30px 178px minmax(0, 1fr);
    gap: 6px 20px;
    align-items: baseline;
  }

  .page-about .about-rules__desc {
    grid-column: 3;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__meta {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    align-items: start;
  }

  .page-about .about-hero__facts {
    grid-template-columns: 1fr;
    gap: 14px;
    padding-top: 4px;
    border-top: 0;
    border-left: 1px solid var(--line);
    padding-left: 22px;
  }

  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(34px, 5vw, 76px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 22px);
    align-self: start;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 1px;
  }

  .page-about .about-rail__link {
    padding: 7px 0;
  }
}

@media (min-width: 1180px) {
  .page-about .about-cols {
    gap: clamp(24px, 3.4vw, 40px);
  }

  .page-about .about-sec__body p {
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-tl__item::before,
  .page-about .about-tl__sum,
  .page-about .about-next a {
    transition: none;
  }
}
<<<END>>>