.page-about {
  --ab-measure: 34em;
  --ab-rail-w: 104px;
  --ab-ease: cubic-bezier(.22, .61, .36, 1);
}

/* 面包屑 */
.page-about .about-crumbs {
  padding-top: 26px;
}

.page-about .about-crumb-sep {
  margin: 0 8px;
  color: var(--dim);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 44px 0 64px;
}

.page-about .about-hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(118deg, rgba(166, 255, 61, .10) 0%, rgba(166, 255, 61, .10) 20%, rgba(166, 255, 61, 0) 20.3%),
    linear-gradient(118deg, rgba(47, 224, 200, 0) 58%, rgba(47, 224, 200, .09) 58.2%, rgba(47, 224, 200, .09) 100%),
    radial-gradient(100% 110% at 108% -10%, rgba(47, 224, 200, .14), rgba(47, 224, 200, 0) 62%);
}

.page-about .about-hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  align-items: end;
}

.page-about .about-title {
  margin: 16px 0 0;
  font-size: clamp(38px, 9.5vw, 78px);
  line-height: 1.02;
  font-weight: 800;
  letter-spacing: -.025em;
  color: var(--ice);
}

.page-about .about-title em {
  font-style: normal;
  color: var(--lime);
}

.page-about .about-lede {
  max-width: var(--ab-measure);
  margin: 22px 0 0;
  color: var(--body);
}

.page-about .about-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero-figure {
  margin: 0;
  border-left: 1px solid var(--hair);
  padding-left: 0;
}

.page-about .about-hero-figure .figure-cap {
  margin-top: 12px;
}

/* 主体两栏 */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  padding-bottom: 20px;
}

/* 章节索引轨 */
.page-about .about-rail {
  display: flex;
  gap: 8px;
  padding-bottom: 10px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

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

.page-about .about-rail-title {
  display: none;
  margin: 0;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .3em;
  color: var(--dim);
  text-transform: uppercase;
}

.page-about .about-rail-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid var(--hair);
  background: var(--panel);
  color: var(--mute);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: border-color .2s var(--ab-ease), color .2s var(--ab-ease), background-color .2s var(--ab-ease);
}

.page-about .about-rail-link:hover,
.page-about .about-rail-link:focus-visible {
  border-color: var(--lime);
  color: var(--ice);
  background: var(--raised);
}

.page-about .about-rail-num {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--lime);
  letter-spacing: .06em;
}

.page-about .about-rail-link:hover .about-rail-label,
.page-about .about-rail-link:focus-visible .about-rail-label {
  color: var(--ice);
}

/* 章节 */
.page-about .about-chapter {
  scroll-margin-top: calc(var(--status-h) + 26px);
}

.page-about .about-sections > .about-chapter + .about-chapter {
  margin-top: 82px;
}

.page-about .about-chapter-head {
  border-top: 1px solid var(--hair);
  padding-top: 26px;
  margin-bottom: 30px;
}

.page-about .about-chapter .chapter-num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(42px, 12vw, 78px);
  line-height: .9;
  font-weight: 700;
  letter-spacing: -.04em;
  color: var(--lime);
}

.page-about .about-chapter .chapter-title {
  margin: 14px 0 0;
  font-size: clamp(24px, 4.6vw, 38px);
  line-height: 1.24;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ice);
}

.page-about .about-chapter .chapter-deck {
  max-width: var(--ab-measure);
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mute);
}

.page-about .about-prose p {
  max-width: var(--ab-measure);
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--body);
}

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

.page-about .about-principles {
  max-width: var(--ab-measure);
  margin: 22px 0 0;
}

.page-about .about-principles strong {
  color: var(--ice);
  font-weight: 700;
}

/* 数据刻度格 */
.page-about .about-meter-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 34px 0 0;
  background: var(--hair);
  border: 1px solid var(--hair);
}

.page-about .about-meter-grid .data-cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 16px;
  background: var(--panel);
}

.page-about .about-meter-grid .data-val {
  font-family: var(--mono);
  font-size: clamp(30px, 7vw, 46px);
  line-height: 1;
  font-weight: 700;
  color: var(--ice);
}

.page-about .about-meter-grid .data-val.is-accent {
  color: var(--lime);
}

.page-about .about-meter-grid .data-val.is-score {
  color: var(--orange);
}

.page-about .about-meter-grid .data-lab {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mute);
}

/* 图片 */
.page-about .about-figure {
  margin: 34px 0 0;
}

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

.page-about .about-figure .figure-cap {
  margin-top: 12px;
}

/* 栏目模块 */
.page-about .about-modules {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-module {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px 20px;
  background: var(--panel);
  border: 1px solid var(--hair);
  transition: border-color .2s var(--ab-ease), transform .2s var(--ab-ease), background-color .2s var(--ab-ease);
}

.page-about .about-module:hover,
.page-about .about-module:focus-within {
  border-color: var(--lime);
  background: var(--raised);
  transform: translateY(-2px);
}

.page-about .about-module-num {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--cyan);
}

.page-about .about-module-title {
  margin: 0;
  font-size: 19px;
  font-weight: 700;
  color: var(--ice);
}

.page-about .about-module-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--body);
}

.page-about .about-module .link {
  margin-top: 4px;
  align-self: flex-start;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

/* 版本节奏时间轴 */
.page-about .about-timeline {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--hair);
}

.page-about .about-tl-item {
  position: relative;
  padding: 4px 0 30px 26px;
}

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

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 10px;
  width: 8px;
  height: 8px;
  background: var(--cyan);
  transform: rotate(45deg);
}

.page-about .about-tl-item:first-child::before {
  background: var(--lime);
}

.page-about .about-tl-title {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  color: var(--ice);
}

.page-about .about-tl-text {
  max-width: var(--ab-measure);
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--body);
}

/* 团队角色 */
.page-about .about-roles {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-roles li {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 20px 0;
  border-top: 1px solid var(--hair);
}

.page-about .about-roles li:last-child {
  border-bottom: 1px solid var(--hair);
}

.page-about .about-role-num {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--lime);
  padding-top: 4px;
}

.page-about .about-role-title {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--ice);
}

.page-about .about-role-text {
  max-width: var(--ab-measure);
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--body);
}

.page-about .about-roles + .about-prose {
  margin-top: 30px;
}

/* 结尾导流 */
.page-about .about-outro {
  margin-top: 72px;
  padding: 54px 0 64px;
  border-top: 1px solid var(--hair);
  background:
    radial-gradient(120% 140% at 0% 0%, rgba(166, 255, 61, .07), rgba(166, 255, 61, 0) 58%),
    var(--panel);
}

.page-about .about-outro-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

.page-about .about-outro-title {
  margin: 12px 0 0;
  font-size: clamp(23px, 4.4vw, 34px);
  line-height: 1.26;
  font-weight: 700;
  color: var(--ice);
}

.page-about .about-outro-text {
  max-width: var(--ab-measure);
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--body);
}

.page-about .about-outro-links {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-outro-link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  min-height: 56px;
  padding: 12px 16px;
  border: 1px solid var(--hair);
  background: var(--ink);
  color: var(--ice);
  text-decoration: none;
  font-size: 15px;
  transition: border-color .2s var(--ab-ease), background-color .2s var(--ab-ease), transform .2s var(--ab-ease);
}

.page-about .about-outro-link:hover,
.page-about .about-outro-link:focus-visible {
  border-color: var(--lime);
  background: var(--raised);
  transform: translateY(-2px);
}

.page-about .about-outro-link-num {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--lime);
  letter-spacing: .1em;
}

.page-about .about-outro-link-arrow {
  color: var(--mute);
  font-size: 15px;
  transition: color .2s var(--ab-ease), transform .2s var(--ab-ease);
}

.page-about .about-outro-link:hover .about-outro-link-arrow,
.page-about .about-outro-link:focus-visible .about-outro-link-arrow {
  color: var(--lime);
  transform: translateX(3px);
}

/* 中等屏幕 */
@media (min-width: 700px) {
  .page-about .about-meter-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-hero {
    padding: 60px 0 76px;
  }
}

/* 桌面：左窄轨索引 + 正文 */
@media (min-width: 1000px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .74fr);
    gap: 62px;
  }

  .page-about .about-hero-figure {
    border-left: 0;
    border-top: 1px solid var(--hair);
    padding-top: 22px;
    margin-bottom: -18px;
  }

  .page-about .about-body {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: 66px;
    padding-bottom: 30px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--status-h) + 30px);
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    max-height: calc(100vh - 120px);
    overflow: visible;
    padding: 0;
    border-top: 1px solid var(--hair);
    padding-top: 18px;
  }

  .page-about .about-rail-title {
    display: block;
  }

  .page-about .about-rail-link {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 0;
    border: 0;
    background: transparent;
    color: var(--mute);
  }

  .page-about .about-rail-link:hover,
  .page-about .about-rail-link:focus-visible {
    background: transparent;
    border-color: transparent;
  }

  .page-about .about-rail-num {
    font-size: 13px;
    color: var(--dim);
    transition: color .2s var(--ab-ease);
  }

  .page-about .about-rail-link:hover .about-rail-num,
  .page-about .about-rail-link:focus-visible .about-rail-num {
    color: var(--lime);
  }

  .page-about .about-rail-label {
    writing-mode: vertical-rl;
    text-orientation: upright;
    letter-spacing: .22em;
    font-size: 12.5px;
    line-height: 1;
    transition: color .2s var(--ab-ease);
  }

  .page-about .about-sections > .about-chapter + .about-chapter {
    margin-top: 104px;
  }

  .page-about .about-outro-grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }
}

@media (min-width: 1180px) {
  .page-about .about-meter-grid .data-cell {
    padding: 26px 22px;
  }

  .page-about .about-module {
    padding: 26px 24px 24px;
  }
}
<<<END>>>