.page-about {
  --about-rail-w: 200px;
  --about-gap: 28px;
  --about-bar-1: #2FBF9B;
  --about-bar-2: #59E3D0;
  --about-bar-3: #F2A33C;
  --about-bar-4: #C97A1E;
  --about-bar-5: #9FB3C4;
  padding: 0 0 72px;
  background: var(--c-deep);
  color: var(--c-paper);
  overflow-x: clip;
}

/* ---------- 顶部与首屏 ---------- */
.page-about .about-top {
  padding-top: 18px;
}

.page-about .about-hero {
  position: relative;
  margin-top: 16px;
  padding: 26px 20px 30px;
  border: 1px solid var(--line-color);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(22, 50, 75, 0.7) 0%, rgba(10, 26, 42, 0.92) 100%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 9px;
  background: repeating-linear-gradient(
    180deg,
    rgba(89, 227, 208, 0.55) 0 1px,
    transparent 1px 11px
  );
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 8px;
  background: linear-gradient(
    90deg,
    var(--c-amber) 0 16%,
    var(--c-jade) 16% 44%,
    var(--c-cyan) 44% 58%,
    var(--c-raised) 58% 100%
  );
}

.page-about .about-hero__kicker {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-amber);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 5.2vw, 50px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--c-paper);
  max-width: 24ch;
}

.page-about .about-hero__lede {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-sand);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__facts li {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 12px;
  border: 1px solid var(--line-color);
  border-radius: var(--radius);
  background: rgba(16, 38, 58, 0.72);
  font-size: 13px;
  line-height: 1.5;
  color: var(--c-sand);
}

.page-about .about-hero__facts .mono {
  font-size: 14px;
  font-weight: 700;
  color: var(--c-amber);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 44px;
}

.page-about .about-rail {
  border-bottom: 1px solid var(--line-color);
  padding-bottom: 22px;
}

.page-about .about-rail__cap {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-scale);
}

.page-about .about-rail__list {
  position: relative;
  margin: 0;
  padding: 0 0 0 18px;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-rail__list::before {
  content: "";
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: 0;
  width: 1px;
  background: var(--line-color);
}

.page-about .about-rail__step {
  position: relative;
}

.page-about .about-rail__step::before {
  content: "";
  position: absolute;
  top: 11px;
  left: -18px;
  width: 8px;
  height: 1px;
  background: var(--c-scale);
  opacity: 0.55;
  transition: background 200ms var(--ease), width 200ms var(--ease), opacity 200ms var(--ease);
}

.page-about .about-rail__step.is-active::before {
  width: 15px;
  background: var(--c-cyan);
  opacity: 1;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--c-scale);
  text-decoration: none;
  transition: color 160ms var(--ease);
}

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

.page-about .about-rail__link:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: 2px;
}

.page-about .about-rail__step.is-active .about-rail__link {
  color: var(--c-paper);
}

.page-about .about-rail__num {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-amber);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  min-width: 0;
}

.page-about .about-chapter + .about-chapter {
  margin-top: 48px;
}

.page-about .about-chapter + .about-chapter::before {
  content: "";
  display: block;
  height: 8px;
  margin-bottom: 26px;
  border-radius: 1px;
  background: linear-gradient(90deg, var(--c-raised) 0%, rgba(22, 50, 75, 0) 92%);
}

.page-about .chapter-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.page-about .chapter-head__index {
  padding: 3px 7px;
  border: 1px solid rgba(242, 163, 60, 0.45);
  border-radius: 2px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-amber);
}

.page-about .chapter-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 3.4vw, 28px);
  line-height: 1.35;
  color: var(--c-paper);
}

.page-about .about-chapter p {
  margin: 0 0 14px;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-sand);
}

.page-about .about-inline-link {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(89, 227, 208, 0.4);
  transition: border-color 160ms var(--ease), color 160ms var(--ease);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--c-paper);
  border-color: var(--c-paper);
}

.page-about .about-inline-link:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

/* ---------- 团队条 ---------- */
.page-about .team-list {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .team-row {
  padding: 14px 16px;
  border: 1px solid var(--line-color);
  border-left: 3px solid var(--c-raised);
  border-radius: var(--radius);
  background: var(--c-panel);
}

.page-about .team-row__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .team-row__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--c-paper);
}

.page-about .team-row__count {
  font-size: 14px;
  font-weight: 700;
  color: var(--c-amber);
}

.page-about .team-row__track {
  display: block;
  height: 6px;
  margin: 10px 0 9px;
  border-radius: 1px;
  background: var(--c-raised);
  overflow: hidden;
}

.page-about .team-row__fill {
  display: block;
  height: 100%;
  border-radius: 1px;
}

.page-about .team-row__fill--a { width: 30%; background: var(--about-bar-1); }
.page-about .team-row__fill--b { width: 25%; background: var(--about-bar-2); }
.page-about .team-row__fill--c { width: 20%; background: var(--about-bar-3); }
.page-about .team-row__fill--d { width: 15%; background: var(--about-bar-4); }
.page-about .team-row__fill--e { width: 10%; background: var(--about-bar-5); }

.page-about .team-row__duty {
  margin: 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-scale);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 26px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line-color);
  border-radius: var(--radius);
}

.page-about .figure__caption {
  margin-top: 10px;
  max-width: 62ch;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-scale);
}

/* ---------- 数据块 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 22px 0 24px;
}

.page-about .data-block {
  padding: 15px 16px;
  border: 1px solid var(--line-color);
  border-left: 3px solid var(--c-amber);
  border-radius: var(--radius);
  background: var(--c-panel);
}

.page-about .data-block__title {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-scale);
}

.page-about .data-block__value {
  margin: 8px 0 6px;
  font-family: var(--font-mono);
  font-size: 25px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--c-paper);
}

.page-about .data-block__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-scale);
}

/* ---------- 阶段时间轴 ---------- */
.page-about .stage-list {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .stage-item__details {
  border: 1px solid var(--line-color);
  border-radius: var(--radius);
  background: var(--c-panel);
  transition: background 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .stage-item__details[open] {
  border-color: rgba(242, 163, 60, 0.42);
  background: var(--c-raised);
}

.page-about .stage-item__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 13px 15px;
  cursor: pointer;
  list-style: none;
}

.page-about .stage-item__summary::-webkit-details-marker {
  display: none;
}

.page-about .stage-item__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--c-scale);
}

.page-about .stage-item__details[open] .stage-item__summary::after {
  content: "–";
  color: var(--c-amber);
}

.page-about .stage-item__summary:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius);
}

.page-about .stage-item__num {
  padding: 2px 6px;
  border: 1px solid rgba(242, 163, 60, 0.4);
  border-radius: 2px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-amber);
}

.page-about .stage-item__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--c-paper);
}

.page-about .stage-item__body {
  padding: 0 15px 15px;
}

.page-about .stage-item__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-sand);
}

/* ---------- 更新节奏日志 ---------- */
.page-about .about-log {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-log .log-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 12px 14px;
  border: 1px solid var(--line-color);
  border-radius: var(--radius);
  background: var(--c-panel);
}

.page-about .about-log .log-item__time {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--c-amber);
}

.page-about .about-log .log-item__body {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-sand);
}

/* ---------- 校核步骤 ---------- */
.page-about .audit-steps {
  margin: 24px 0 0;
  padding: 0 0 0 22px;
  list-style: none;
  border-left: 1px solid var(--line-color);
}

.page-about .audit-step {
  position: relative;
  padding-bottom: 24px;
}

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

.page-about .audit-step::before {
  content: "";
  position: absolute;
  top: 5px;
  left: -28px;
  width: 12px;
  height: 12px;
  border: 2px solid var(--c-cyan);
  border-radius: 50%;
  background: var(--c-deep);
}

.page-about .audit-step__num {
  display: block;
  margin-bottom: 4px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-amber);
}

.page-about .audit-step__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--c-paper);
}

.page-about .audit-step__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-sand);
}

/* ---------- 玻璃注释 ---------- */
.page-about .about-note {
  margin-top: 26px;
  padding: 16px 18px;
  border-left: 3px solid var(--c-cyan);
  backdrop-filter: blur(8px);
}

.page-about .about-note__term {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-cyan);
}

.page-about .about-note__text {
  margin: 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-sand);
}

/* ---------- 起订与周期 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  align-items: start;
}

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

.page-about .about-figure--square {
  margin-top: 0;
}

.page-about .table-wrap {
  margin-top: 26px;
  overflow-x: auto;
  border: 1px solid var(--line-color);
  border-radius: var(--radius);
}

.page-about .about-table__caption {
  caption-side: top;
  padding: 11px 14px;
  text-align: left;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-scale);
  background: var(--c-raised);
}

.page-about .data-table th,
.page-about .data-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line-color);
  font-size: 14px;
  line-height: 1.65;
  text-align: left;
  color: var(--c-sand);
  white-space: normal;
}

.page-about .data-table thead th {
  background: var(--c-raised);
  color: var(--c-paper);
  font-weight: 700;
}

.page-about .data-table tbody th {
  font-weight: 700;
  color: var(--c-paper);
}

.page-about .data-table tbody tr:last-child th,
.page-about .data-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .data-table__num {
  font-size: 15px;
  font-weight: 700;
  color: var(--c-amber);
  white-space: nowrap;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

/* ---------- 渠道边界 ---------- */
.page-about .about-chapter--quiet .about-quiet {
  max-width: 64ch;
}

.page-about .contact-block {
  margin: 22px 0 20px;
  padding: 0;
  display: grid;
  gap: 1px;
  border: 1px solid var(--line-color);
  border-radius: var(--radius);
  background: var(--line-color);
  overflow: hidden;
}

.page-about .contact-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 13px 16px;
  background: var(--c-panel);
}

.page-about .contact-row dt {
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-scale);
}

.page-about .contact-row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-paper);
  word-break: break-word;
}

.page-about .contact-row dd .mono {
  letter-spacing: 0.02em;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero {
    padding: 34px 32px 38px;
  }

  .page-about .contact-row {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }

  .page-about .about-log .log-item {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .about-rail {
    border-bottom: 0;
    border-right: 1px solid var(--line-color);
    padding: 0 20px 0 0;
  }

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

  .page-about .about-figure--offset {
    margin-left: -24px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.45fr) minmax(220px, 320px);
    gap: 32px;
  }

  .page-about .about-figure--square {
    margin-top: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__step::before,
  .page-about .about-rail__link,
  .page-about .stage-item__details,
  .page-about .about-inline-link {
    transition-duration: 0.01ms;
  }
}
<<<END>>>