.page-about {
  --about-rail-w: 208px;
  --about-gap: 40px;
  --about-measure: 62ch;
}

.page-about .about-crumbs {
  padding-top: 22px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 20px 0 0;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 28px;
  align-items: end;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(34px, 7.2vw, 74px);
  line-height: 1.04;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.page-about .about-hero__note {
  margin: 18px 0 0;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

.page-about .about-hero__body p {
  margin: 0 0 16px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .about-hero__body .lead {
  color: var(--ink);
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.6;
  font-weight: 500;
}

.page-about .about-pills {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-pills__item {
  padding: 7px 12px;
  border: 3px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  font-size: 13px;
  line-height: 1.2;
}

.page-about .about-rule {
  height: 16px;
  margin-top: 34px;
  border-top: 3px solid var(--line);
  border-bottom: 3px solid var(--line);
  background: repeating-linear-gradient(
    135deg,
    var(--line) 0 10px,
    transparent 10px 22px
  );
}

/* ---------- 正文双栏 ---------- */
.page-about .about-body {
  padding: 44px 0 0;
}

.page-about .about-body__grid {
  display: grid;
  gap: 36px;
}

.page-about .about-rail__label {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ink-soft);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
}

.page-about .about-rail__row {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 3px solid var(--line);
  background: var(--panel);
  color: var(--ink-soft);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-rail__num {
  color: var(--orange);
  font-size: 12px;
}

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

.page-about .about-rail__caption {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
  border-left: 3px solid var(--orange);
  padding-left: 12px;
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  max-width: var(--about-measure);
}

.page-about .about-sec--wide {
  max-width: none;
}

.page-about .about-sec__index {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .about-sec__title {
  margin: 0 0 18px;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.16;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-sec p {
  margin: 0 0 16px;
  line-height: 1.78;
  color: var(--ink-soft);
  font-size: 16px;
}

.page-about .about-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 2px solid var(--line);
  padding-bottom: 1px;
}

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

/* ---------- 数据看板 ---------- */
.page-about .about-board {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 3px;
  background: var(--line);
  border: 3px solid var(--line);
  box-shadow: var(--shadow-hard);
}

.page-about .about-board--alt {
  background: var(--bg);
}

.page-about .about-board__cell {
  background: var(--panel);
  padding: 20px 16px 22px;
  min-width: 0;
}

.page-about .about-board--alt .about-board__cell {
  background: var(--bg);
}

.page-about .about-board__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(34px, 7vw, 64px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-board--alt .about-board__num {
  color: var(--orange);
}

.page-about .about-board__num--sm {
  font-size: clamp(24px, 5vw, 46px);
  padding-top: 8px;
}

.page-about .about-board__unit {
  font-size: 0.42em;
  margin-left: 4px;
  color: var(--ink-soft);
  letter-spacing: 0;
}

.page-about .about-board__label {
  display: block;
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--ink-soft);
}

/* ---------- 流程步骤 + 图 ---------- */
.page-about .about-media {
  display: grid;
  gap: 24px;
  margin: 26px 0 22px;
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-steps__item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px 16px 14px;
  border: 3px solid var(--line);
  background: var(--panel);
}

.page-about .about-steps__num {
  flex: 0 0 auto;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  background: var(--cyan);
  color: var(--bg);
  font-size: 14px;
  font-weight: 700;
}

.page-about .about-steps__title {
  margin: 2px 0 6px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-steps__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink-soft);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  border: 3px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-hard-sm);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-figure--wide img {
  aspect-ratio: 16 / 9;
}

.page-about .about-figure--portrait img {
  aspect-ratio: 3 / 4;
}

.page-about .about-figure__cap {
  padding: 10px 12px 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-soft);
  border-top: 3px solid var(--line);
}

.page-about .about-sec--wide .about-figure--wide {
  margin: 6px 0 26px;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 24px;
  margin-top: 6px;
}

.page-about .about-roles {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 2px;
  background: var(--line);
  border: 3px solid var(--line);
}

.page-about .about-roles__item {
  background: var(--panel);
  padding: 13px 16px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .about-roles__item strong {
  color: var(--cyan);
  font-weight: 700;
  margin-right: 8px;
}

/* ---------- 版本时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 3px;
  background: var(--line);
  border: 3px solid var(--line);
  box-shadow: var(--shadow-hard-sm);
}

.page-about .about-timeline__item {
  background: var(--panel);
  padding: 20px 18px 22px;
  border-left: 6px solid var(--line);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover {
  border-left-color: var(--cyan);
}

.page-about .about-timeline__dot {
  display: block;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(43, 243, 228, 0.16);
  margin-bottom: 14px;
}

.page-about .about-timeline__item--now {
  border-left-color: var(--orange);
  background: #0d1f42;
}

.page-about .about-timeline__item--now .about-timeline__dot {
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 44, 0.2);
}

.page-about .about-timeline__ver {
  margin: 0;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-timeline__item--now .about-timeline__ver {
  color: var(--orange);
}

.page-about .about-timeline__name {
  margin: 10px 0 6px;
  font-size: 16px;
  font-weight: 800;
  color: var(--ink);
  line-height: 1.4;
}

.page-about .about-timeline__pop {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--ink-soft);
}

.page-about .about-timeline__note {
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 内容原则 ---------- */
.page-about .about-rules {
  list-style: none;
  margin: 8px 0 22px;
  padding: 0;
  display: grid;
  gap: 2px;
  background: var(--line);
  border: 3px solid var(--line);
}

.page-about .about-rules__item {
  background: var(--panel);
  padding: 18px 18px 16px;
}

.page-about .about-rules__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
  padding-left: 14px;
  position: relative;
}

.page-about .about-rules__title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  background: var(--amber);
}

.page-about .about-rules__item p {
  margin: 0;
  padding-left: 14px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink-soft);
}

/* ---------- 结尾行动带 ---------- */
.page-about .about-cta {
  margin-top: 72px;
  border-top: 3px solid var(--line);
  border-bottom: 3px solid var(--line);
  background:
    repeating-linear-gradient(
      135deg,
      rgba(43, 243, 228, 0.05) 0 12px,
      transparent 12px 26px
    ),
    var(--panel);
}

.page-about .about-cta__inner {
  display: flex;
  flex-direction: column;
  gap: 22px;
  padding: 34px 0;
}

.page-about .about-cta__title {
  margin: 0 0 8px;
  font-size: clamp(20px, 2.8vw, 28px);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--ink);
  line-height: 1.3;
}

.page-about .about-cta__sub {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    gap: 48px;
  }

  .page-about .about-board {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-media {
    grid-template-columns: 1.08fr 0.92fr;
    align-items: start;
    gap: 28px;
  }

  .page-about .about-team {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 30px;
    align-items: start;
  }

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

  .page-about .about-cta__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
    padding: 40px 0;
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    padding-top: 60px;
  }

  .page-about .about-body__grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    column-gap: 56px;
    row-gap: 68px;
  }

  .page-about .about-rail {
    grid-column: 1;
    grid-row: 1 / -1;
  }

  .page-about .about-body__grid > :not(.about-rail) {
    grid-column: 2;
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: 96px;
  }

  .page-about .about-rail__list {
    display: grid;
    gap: 0;
    overflow: visible;
    border-left: 3px solid var(--line);
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    border: 0;
    background: transparent;
    padding: 9px 0 9px 14px;
    margin-left: -3px;
    border-left: 3px solid transparent;
    white-space: normal;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-left-color: var(--cyan);
    background: transparent;
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-team {
    grid-template-columns: 300px minmax(0, 1fr);
    gap: 36px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-body__grid {
    column-gap: 72px;
  }

  .page-about .about-hero__grid {
    gap: 64px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-timeline__item {
    transition: none;
  }
}
<<<END>>>