.page-about {
  --about-rail: 212px;
  --about-gap: 34px;
  background: var(--ink);
  color: var(--fog);
  font-family: var(--font-sans);
  line-height: 1.75;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding: 18px 0 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 22px 0 52px;
  background:
    radial-gradient(115% 92% at 92% -12%, rgba(53, 224, 208, 0.16), transparent 60%),
    radial-gradient(80% 74% at 2% 112%, rgba(242, 166, 59, 0.1), transparent 62%),
    linear-gradient(180deg, var(--ink-deep) 0%, var(--ink) 88%);
}

.page-about .about-hero__frame {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 34px 22px 30px;
  background: linear-gradient(155deg, rgba(27, 16, 54, 0.62) 0%, rgba(8, 19, 31, 0.35) 64%);
  box-shadow: inset 0 1px 0 rgba(234, 241, 246, 0.05), 0 22px 46px -34px rgba(0, 0, 0, 0.95);
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 13px;
  background-image: repeating-linear-gradient(90deg, var(--line) 0, var(--line) 1px, transparent 1px, transparent 26px);
  pointer-events: none;
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 84px;
  height: 2px;
  background: linear-gradient(90deg, var(--amber), rgba(242, 166, 59, 0));
  pointer-events: none;
}

.page-about .about-hero__title {
  margin: 16px 0 18px;
  max-width: 21ch;
  font-size: clamp(28px, 5.6vw, 50px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--fog);
}

.page-about .about-hero__lede {
  max-width: 64ch;
  margin: 0;
  font-size: 16.5px;
  color: var(--fog-soft);
}

.page-about .about-hero__actions {
  margin-top: 26px;
}

/* ---------- 目录 + 正文分栏 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding: 34px 0 76px;
}

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

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-about .about-rail__list,
.page-about .about-rail__sub {
  list-style: none;
  margin: 0;
  padding: 0;
}

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

.page-about .about-rail__link {
  display: flex;
  gap: 10px;
  align-items: baseline;
  margin-left: -1px;
  padding: 9px 0 9px 14px;
  border-left: 1px solid transparent;
  color: var(--steel);
  font-size: 13.5px;
  text-decoration: none;
  transition: color var(--ease), border-color var(--ease), background-color var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--fog);
  border-left-color: var(--amber);
  background: rgba(242, 166, 59, 0.08);
}

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

.page-about .about-rail__sub {
  padding: 2px 0 8px 26px;
}

.page-about .about-rail__sub-link {
  display: block;
  padding: 3px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(147, 167, 184, 0.72);
  text-decoration: none;
  transition: color var(--ease);
}

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

/* ---------- 章节面板 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: 26px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(16, 36, 56, 0.42);
  box-shadow: 0 22px 46px -38px rgba(0, 0, 0, 0.95);
}

.page-about .about-chapter.panel--indigo {
  background: linear-gradient(158deg, rgba(27, 16, 54, 0.86) 0%, rgba(10, 24, 38, 0.74) 100%);
}

.page-about .about-chapter.panel--jade {
  background: linear-gradient(158deg, rgba(14, 79, 85, 0.6) 0%, rgba(10, 24, 38, 0.86) 100%);
}

.page-about .about-chapter.about-chapter--cadence {
  background: linear-gradient(158deg, rgba(110, 35, 56, 0.32) 0%, rgba(10, 24, 38, 0.9) 62%);
  border-left: 2px solid rgba(110, 35, 56, 0.9);
}

.page-about .about-chapter.panel--pearl,
.page-about .about-chapter.about-chapter--light {
  background: var(--pearl);
  border-color: rgba(10, 24, 38, 0.14);
  color: var(--ink);
}

.page-about .about-chapter.panel--pearl .panel__label {
  color: rgba(10, 24, 38, 0.5);
}

.page-about .about-chapter.panel--pearl .section-title,
.page-about .about-chapter.panel--pearl h3 {
  color: var(--ink);
}

.page-about .about-chapter .section-title {
  margin: 6px 0 0;
}

.page-about .about-lead {
  margin: 0;
  max-width: 66ch;
  font-size: 16px;
  color: var(--fog-soft);
}

.page-about .about-lead--dark {
  color: #33485a;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .about-timeline__item::before {
  content: "";
  display: block;
  width: 28px;
  height: 2px;
  margin-bottom: 14px;
  background: var(--amber);
  transition: width var(--ease);
}

.page-about .about-timeline__item:hover::before {
  width: 52px;
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--amber);
}

.page-about .about-timeline__title {
  margin: 6px 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 14.5px;
  color: var(--steel);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 30px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(120deg, rgba(14, 79, 85, 0.4), rgba(27, 16, 54, 0.5));
}

.page-about .about-chapter.panel--pearl .about-figure img {
  border-color: rgba(10, 24, 38, 0.16);
}

/* ---------- 团队 ---------- */
.page-about .about-crew {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(34, 56, 78, 0.72);
  border: 1px solid var(--line);
}

.page-about .about-crew__item {
  padding: 22px 20px;
  background: rgba(8, 19, 31, 0.62);
  transition: background-color var(--ease), box-shadow var(--ease);
}

.page-about .about-crew__item:hover,
.page-about .about-crew__item:focus-within {
  background: rgba(14, 79, 85, 0.42);
  box-shadow: inset 0 0 0 1px rgba(242, 166, 59, 0.38);
}

.page-about .about-crew__num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-crew__title {
  margin: 8px 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .about-crew__text {
  margin: 0;
  font-size: 14.5px;
  color: var(--fog-soft);
}

.page-about .about-callout {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: baseline;
  margin: 26px 0 0;
  padding: 16px 18px;
  border-left: 2px solid var(--amber);
  background: rgba(242, 166, 59, 0.08);
  font-size: 14.5px;
  color: var(--fog-soft);
}

.page-about .about-callout__lead {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

/* ---------- 电脑端优先 ---------- */
.page-about .about-rules {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  counter-reset: about-rule;
  display: grid;
  gap: 0;
}

.page-about .about-rules__item {
  position: relative;
  padding: 20px 0 20px 34px;
  border-top: 1px solid rgba(10, 24, 38, 0.14);
}

.page-about .about-rules__item:last-child {
  border-bottom: 1px solid rgba(10, 24, 38, 0.14);
}

.page-about .about-rules__item::before {
  counter-increment: about-rule;
  content: "0" counter(about-rule);
  position: absolute;
  left: 0;
  top: 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(10, 24, 38, 0.45);
}

.page-about .about-rules__title {
  margin: 0 0 6px;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-rules__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  color: #405568;
}

.page-about .about-metrics {
  display: grid;
  gap: 1px;
  margin-top: 28px;
  background: rgba(10, 24, 38, 0.14);
  border: 1px solid rgba(10, 24, 38, 0.14);
}

.page-about .about-metrics__item {
  padding: 20px 22px;
  background: var(--pearl);
}

.page-about .about-metrics__score {
  display: block;
  font-size: 38px;
  font-weight: 700;
  line-height: 1.05;
  color: var(--ink);
}

.page-about .about-metrics__label {
  display: block;
  margin-top: 6px;
  font-size: 13.5px;
  color: #55697a;
}

/* ---------- 更新节奏 ---------- */
.page-about .about-version {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  align-items: baseline;
  margin: 0;
  padding: 0 0 20px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-version__line {
  font-size: 44px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--amber);
}

.page-about .about-version__hint {
  font-size: 13.5px;
  color: var(--steel);
}

.page-about .about-steps {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-steps__num {
  padding-top: 4px;
  font-size: 12px;
  color: var(--amber);
}

.page-about .about-steps__title {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .about-steps__desc {
  grid-column: 2;
  margin: 0;
  font-size: 14.5px;
  color: var(--steel);
}

.page-about .about-inline-links {
  margin: 24px 0 0;
  font-size: 15px;
  color: var(--fog-soft);
}

.page-about .about-inline-links a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 208, 0.4);
  transition: border-color var(--ease), color var(--ease);
}

.page-about .about-inline-links a:hover,
.page-about .about-inline-links a:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

/* ---------- 服务范围 ---------- */
.page-about .about-reach {
  display: grid;
  gap: 22px;
  margin: 24px 0 0;
}

.page-about .about-reach__item {
  padding-left: 18px;
  border-left: 2px solid rgba(53, 224, 208, 0.5);
}

.page-about .about-reach__num {
  display: block;
  font-size: 28px;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--amber);
}

.page-about .about-reach__label {
  display: block;
  margin-top: 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--fog);
}

.page-about .about-reach__text {
  margin: 6px 0 0;
  font-size: 14px;
  color: var(--steel);
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  margin-top: 32px;
  padding: 26px 20px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
  border-radius: var(--radius);
  background: linear-gradient(120deg, rgba(242, 166, 59, 0.12) 0%, rgba(10, 24, 38, 0.5) 62%);
}

.page-about .about-cta__title {
  margin: 0 0 8px;
  font-size: 20px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .about-cta__text {
  margin: 0 0 20px;
  max-width: 58ch;
  font-size: 15px;
  color: var(--fog-soft);
}

/* ---------- 锚点偏移 ---------- */
.page-about .about-chapter,
.page-about .about-timeline__item {
  scroll-margin-top: calc(var(--bar-h-sm) + 18px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .about-hero__frame {
    padding: 40px 36px 36px;
  }

  .page-about .about-chapter {
    padding: 32px 30px;
  }

  .page-about .about-crew {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-metrics {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-reach {
    grid-template-columns: 1fr 1fr;
    gap: 26px 28px;
  }

  .page-about .about-cta {
    padding: 30px 30px;
  }
}

@media (min-width: 760px) {
  .page-about .about-timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    border-top: 1px solid var(--line);
    padding-top: 22px;
  }

  .page-about .about-timeline__item {
    padding: 0 20px;
    border-left: 1px solid var(--line);
  }

  .page-about .about-timeline__item:first-child {
    padding-left: 0;
    border-left: 0;
  }

  .page-about .about-timeline__item:last-child {
    padding-right: 0;
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
    padding: 46px 0 88px;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--bar-h-sm) + 26px);
  }

  .page-about .about-hero {
    padding: 26px 0 64px;
  }

  .page-about .about-chapter {
    padding: 34px 36px;
  }
}
<<<END>>>