.page-about {
  --about-rail-w: clamp(120px, 15vw, 184px);
  --about-sticky: 84px;
}

/* ---------- 页首 ---------- */
.page-about .about-head {
  padding-top: clamp(18px, 3vw, 36px);
  padding-bottom: clamp(8px, 2vw, 20px);
}

.page-about .about-head h1 {
  font-family: var(--font-display);
  font-size: clamp(30px, 5.6vw, 62px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--deep);
  margin: 14px 0 22px;
  max-width: 17em;
}

.page-about .about-head .lede {
  max-width: 60ch;
  font-size: clamp(16px, 1.35vw, 19px);
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .about-head__note {
  max-width: 58ch;
  margin: 18px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--cyan);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-3);
}

/* ---------- 主体布局：窄栏章节轨 + 宽栏正文 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding-top: clamp(30px, 5vw, 64px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
  }
}

.page-about .about-body {
  min-width: 0;
}

/* ---------- 章节轨 ---------- */
.page-about .about-rail {
  position: sticky;
  top: 0;
  z-index: 6;
  margin-inline: calc(-1 * clamp(16px, 4vw, 32px));
  padding: 10px clamp(16px, 4vw, 32px);
  background: rgba(245, 247, 251, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--hair);
}

.page-about .about-rail__title {
  display: none;
  margin: 0 0 14px;
  padding-left: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--line);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: row;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 14px;
  border-radius: var(--r-pill);
  background: rgba(10, 31, 68, 0.055);
  color: var(--ink-3);
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  background: rgba(0, 102, 255, 0.1);
  color: var(--deep);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--violet);
}

.page-about .about-rail__label {
  font-size: 13px;
  line-height: 1.2;
}

@media (min-width: 1000px) {
  .page-about .about-rail {
    margin-inline: 0;
    padding: 0;
    background: none;
    backdrop-filter: none;
    border-bottom: 0;
    top: var(--about-sticky);
    align-self: start;
  }

  .page-about .about-rail__title {
    display: block;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-about .about-rail__link {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 12px 0 12px 16px;
    border-radius: 0;
    border-left: 1px solid var(--hair);
    background: none;
  }

  .page-about .about-rail__link::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 50%;
    transform: translateY(-50%);
    width: 2px;
    height: 0;
    border-radius: 2px;
    background: var(--cyan);
    transition: height 0.32s var(--ease);
  }

  .page-about .about-rail__link:hover::before,
  .page-about .about-rail__link:focus-visible::before {
    height: 100%;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: none;
  }

  .page-about .about-rail__num {
    font-family: var(--font-display);
    font-size: clamp(22px, 2.3vw, 34px);
    line-height: 1.1;
    color: var(--line);
    transition: color 0.25s var(--ease);
  }

  .page-about .about-rail__link:hover .about-rail__num,
  .page-about .about-rail__link:focus-visible .about-rail__num {
    color: var(--cyan);
  }

  .page-about .about-rail__label {
    margin-top: 2px;
    font-size: 13.5px;
    color: var(--ink-3);
    transition: color 0.25s var(--ease);
  }

  .page-about .about-rail__link:hover .about-rail__label,
  .page-about .about-rail__link:focus-visible .about-rail__label {
    color: var(--deep);
  }
}

/* ---------- 章节本体 ---------- */
.page-about .about-chapter {
  padding-block: clamp(26px, 4vw, 46px);
  border-top: 1px solid var(--hair);
}

.page-about .about-body > .about-chapter:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-chapter__num {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--violet);
}

.page-about .about-chapter__num::after {
  content: "";
  flex: 0 0 auto;
  width: 48px;
  height: 1px;
  background: var(--line);
  opacity: 0.55;
}

.page-about .about-chapter__title {
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 40px);
  font-weight: 700;
  line-height: 1.26;
  letter-spacing: -0.005em;
  color: var(--deep);
  margin: 0 0 18px;
  max-width: 18em;
}

.page-about .about-chapter__lede {
  max-width: 58ch;
  margin: 0 0 22px;
  padding-left: 18px;
  border-left: 3px solid var(--cyan);
  font-size: clamp(15.5px, 1.2vw, 17.5px);
  line-height: 1.9;
  color: var(--ink-2);
}

.page-about .about-prose {
  max-width: 62ch;
}

.page-about .about-prose p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.95;
  color: var(--ink-2);
}

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

.page-about .about-prose a {
  color: var(--electric);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 102, 255, 0.35);
  padding-bottom: 1px;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}

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

/* ---------- 图片 ---------- */
.page-about .figure {
  margin: 28px 0;
}

.page-about .figure__media {
  border-radius: var(--r-lg);
  overflow: hidden;
  background: linear-gradient(140deg, var(--deep) 0%, var(--indigo) 55%, var(--teal) 100%);
  box-shadow: var(--shadow);
}

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

.page-about .figure__cap {
  margin-top: 12px;
  padding-left: 14px;
  border-left: 2px solid var(--line);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-3);
}

.page-about .figure--teal .figure__media {
  background: linear-gradient(140deg, var(--teal) 0%, var(--indigo) 70%, var(--violet) 100%);
}

.page-about .figure--wine .figure__media {
  background: linear-gradient(140deg, var(--wine) 0%, var(--indigo) 60%, var(--deep) 100%);
}

/* ---------- 批注卡片 ---------- */
.page-about .note-card {
  max-width: 62ch;
  margin: 24px 0 0;
  padding: 18px 20px;
  border-left: 4px solid var(--violet);
  border-radius: var(--r-md);
  background: rgba(75, 59, 143, 0.06);
  transition: background 0.3s var(--ease);
}

.page-about .note-card:hover,
.page-about .note-card:focus-within {
  background: rgba(75, 59, 143, 0.12);
}

.page-about .note-card:focus-visible {
  outline: 2px solid var(--electric);
  outline-offset: 3px;
}

.page-about .note-card__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--violet);
}

.page-about .note-card__body {
  margin: 0;
  max-height: 3.8em;
  overflow: hidden;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink-2);
  transition: max-height 0.45s var(--ease);
}

.page-about .note-card:hover .note-card__body,
.page-about .note-card:focus-within .note-card__body {
  max-height: 26em;
}

.page-about .note-card__hint {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-3);
}

.page-about .note-card:hover .note-card__hint,
.page-about .note-card:focus-within .note-card__hint {
  opacity: 0;
  transition: opacity 0.25s var(--ease);
}

/* ---------- 引用块 ---------- */
.page-about .pullquote {
  max-width: 62ch;
  margin: 30px 0 0;
  padding: 24px 26px 22px 30px;
  border-left: 6px solid var(--cyan);
  border-radius: var(--r-lg);
  background: linear-gradient(135deg, var(--indigo) 0%, var(--violet) 100%);
  color: #fff;
}

.page-about .pullquote > p {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(16.5px, 1.55vw, 21px);
  font-weight: 600;
  line-height: 1.72;
}

.page-about .pullquote p.pullquote__src {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 400;
  letter-spacing: 0.14em;
  color: rgba(255, 255, 255, 0.68);
}

/* ---------- 规模色带 ---------- */
.page-about .stat-band {
  position: relative;
  overflow: hidden;
  margin: clamp(34px, 5vw, 58px) 0;
  padding: clamp(30px, 4.4vw, 58px) clamp(22px, 3.6vw, 52px);
  border-radius: var(--r-xl);
  background: var(--indigo);
  color: #fff;
  scroll-margin-top: 72px;
}

.page-about .stat-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(136, 146, 166, 0.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(136, 146, 166, 0.16) 1px, transparent 1px);
  background-size: 46px 46px;
  pointer-events: none;
}

.page-about .stat-band::after {
  content: "";
  position: absolute;
  right: -130px;
  top: -130px;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(77, 208, 225, 0.3), transparent 68%);
  pointer-events: none;
}

.page-about .stat-band > * {
  position: relative;
  z-index: 1;
}

.page-about .stat-band__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(23px, 3vw, 36px);
  font-weight: 700;
  line-height: 1.25;
  color: #fff;
}

.page-about .stat-band__lede {
  max-width: 58ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.8);
}

.page-about .stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px 18px;
  margin-top: 28px;
}

@media (min-width: 760px) {
  .page-about .stat-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }
}

.page-about .stat {
  min-width: 0;
}

.page-about .stat__num {
  display: inline-block;
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 2px solid rgba(77, 208, 225, 0.5);
  font-family: var(--font-mono);
  font-size: clamp(21px, 2.9vw, 34px);
  font-weight: 700;
  line-height: 1.15;
  color: var(--cyan);
}

.page-about .stat__label {
  display: block;
  font-size: 13.5px;
  line-height: 1.72;
  color: rgba(255, 255, 255, 0.78);
}

/* ---------- 状态面板 ---------- */
.page-about .about-status {
  max-width: 62ch;
  margin-top: 28px;
  padding: 16px 20px;
  border: 1px solid var(--hair);
  border-radius: var(--r-md);
  background: #fff;
}

.page-about .about-status .status__row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--hair);
}

.page-about .about-status .status__row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-status .status__row:first-child {
  padding-top: 0;
}

.page-about .about-status .status__label {
  flex: 1 1 auto;
  font-size: 14px;
  color: var(--ink-3);
}

.page-about .about-status .status__value {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--deep);
  white-space: nowrap;
}

.page-about .about-status .status__dot {
  flex: 0 0 auto;
}

/* ---------- 后续路径 ---------- */
.page-about .about-next {
  margin-bottom: clamp(48px, 7vw, 96px);
  padding: clamp(26px, 4vw, 44px);
  border: 1px solid var(--hair);
  border-radius: var(--r-xl);
  background: var(--mist);
}

.page-about .about-next__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(21px, 2.6vw, 30px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--deep);
}

.page-about .about-next__lede {
  max-width: 56ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .about-next__list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

@media (min-width: 760px) {
  .page-about .about-next__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-next__list a {
  display: block;
  height: 100%;
  padding: 18px 20px;
  border: 1px solid var(--hair);
  border-radius: var(--r-md);
  background: #fff;
  color: var(--deep);
  text-decoration: none;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  border-color: var(--electric);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.page-about .about-next__k {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .about-next__d {
  display: block;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--ink-3);
}

/* ---------- 锚点偏移 ---------- */
.page-about .about-chapter {
  scroll-margin-top: 76px;
}

@media (min-width: 1000px) {
  .page-about .about-chapter {
    scroll-margin-top: 96px;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link::before,
  .page-about .note-card__body,
  .page-about .note-card__hint,
  .page-about .about-next__list a {
    transition: none;
  }

  .page-about .about-next__list a:hover {
    transform: none;
  }
}
<<<END>>>