.page-about {
  background: var(--ink);
  color: var(--paper);
  padding-bottom: 64px;
}

.page-about__crumb {
  padding-top: 18px;
  padding-bottom: 6px;
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  padding: 22px 0 44px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(110% 80% at 85% -10%, rgba(69, 240, 194, .09), transparent 62%),
    linear-gradient(180deg, #0B221C 0%, var(--ink) 72%);
}

.page-about .about-hero__inner {
  display: grid;
  gap: 26px;
}

.page-about .about-hero__copy h1 {
  font-family: var(--font-narrow);
  font-weight: 800;
  font-size: clamp(2rem, 8vw, 3.4rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 10px 0 16px;
  color: var(--paper-hi);
}

.page-about .about-hero__lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 48ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-about .about-hero__frame {
  border: 1px solid var(--line);
  background:
    repeating-linear-gradient(90deg, rgba(30, 61, 51, .5) 0 1px, transparent 1px 44px),
    rgba(14, 42, 34, .55);
  padding: 18px 16px;
}

.page-about .about-hero__frame-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--caramel);
  margin-bottom: 14px;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  list-style: none;
}

.page-about .about-hero__facts li {
  background: var(--ink-2);
  padding: 14px 12px;
}

.page-about .about-hero__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 6vw, 1.75rem);
  font-weight: 600;
  color: var(--cyan);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.page-about .about-hero__unit {
  display: block;
  margin-top: 5px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
}

/* ===== 侧栏 + 正文 ===== */
.page-about .about-shell {
  display: grid;
  gap: 28px;
  padding-top: 36px;
}

.page-about .about-rail__kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--caramel);
  margin-bottom: 10px;
}

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

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

.page-about .about-rail__link {
  flex: 0 0 auto;
  display: block;
  border: 1px solid var(--line);
  padding: 8px 12px;
  font-size: 13px;
  color: var(--cyan-soft);
  text-decoration: none;
  white-space: nowrap;
  transition: color .18s var(--ease), background-color .18s var(--ease), border-color .18s var(--ease);
}

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

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: 56px;
  min-width: 0;
}

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

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  border-top: 1px solid var(--line);
  padding-top: 16px;
  margin-bottom: 16px;
}

.page-about .about-chapter__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--orange);
  flex: 0 0 auto;
}

.page-about .about-chapter h2 {
  font-family: var(--font-narrow);
  font-weight: 800;
  font-size: clamp(1.35rem, 5vw, 1.85rem);
  line-height: 1.25;
  letter-spacing: .01em;
  color: var(--paper-hi);
}

.page-about .about-chapter p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-chapter p + p {
  margin-top: 14px;
}

.page-about .about-chapter__intro {
  margin-bottom: 18px;
}

/* ===== 图片 ===== */
.page-about .about-figure {
  margin: 24px 0 0;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(.88) contrast(1.04);
}

.page-about .about-figure figcaption {
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

/* ===== 三条内容线（可展开） ===== */
.page-about .about-lines {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .about-line {
  border: 1px solid var(--line);
  background: rgba(14, 42, 34, .5);
}

.page-about .about-line summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-line summary::-webkit-details-marker {
  display: none;
}

.page-about .about-line__tag {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  padding: 3px 8px;
  color: var(--ink);
  background: var(--caramel);
}

.page-about .about-line__title {
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: 17px;
  color: var(--paper-hi);
  letter-spacing: .02em;
}

.page-about .about-line__more {
  margin-left: auto;
  flex: 0 0 auto;
  position: relative;
  width: 12px;
  height: 12px;
}

.page-about .about-line__more::before,
.page-about .about-line__more::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform .2s var(--ease), opacity .2s var(--ease);
}

.page-about .about-line__more::before {
  left: 0;
  top: 5px;
  width: 12px;
  height: 1.5px;
}

.page-about .about-line__more::after {
  left: 5px;
  top: 0;
  width: 1.5px;
  height: 12px;
}

.page-about .about-line[open] .about-line__more::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .about-line__body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--line);
  margin-top: 0;
}

.page-about .about-line__body p {
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
  padding-top: 12px;
}

.page-about .about-line__list {
  list-style: none;
  padding-top: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
}

.page-about .about-line__list li {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan-soft);
  border-left: 1px solid var(--line);
  padding-left: 8px;
}

.page-about .about-line__link {
  display: inline-block;
  margin-top: 6px;
  font-size: 14px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(69, 240, 194, .45);
  padding-bottom: 2px;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

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

/* ===== 流程步骤 ===== */
.page-about .about-steps {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  list-style: none;
}

.page-about .about-step {
  background: var(--ink-2);
  padding: 16px 16px 18px;
}

.page-about .about-step__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--brick);
}

.page-about .about-step h3 {
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: 16px;
  color: var(--paper-hi);
  margin: 6px 0 8px;
}

.page-about .about-step p {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ===== 覆盖数据 ===== */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  list-style: none;
  margin-top: 20px;
}

.page-about .about-metrics li {
  background: var(--ink-2);
  padding: 18px 14px;
}

.page-about .about-metrics__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 7vw, 2.1rem);
  font-weight: 600;
  color: var(--cyan);
  line-height: 1;
  letter-spacing: -0.02em;
}

.page-about .about-metrics__num em {
  font-style: normal;
  font-size: .55em;
  color: var(--cyan-soft);
}

.page-about .about-metrics__label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

/* ===== 团队 ===== */
.page-about .about-teams {
  display: grid;
  gap: 14px;
  list-style: none;
  margin-top: 22px;
}

.page-about .about-teams li {
  border-left: 2px solid var(--line);
  padding: 4px 0 4px 14px;
}

.page-about .about-teams h3 {
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: 16px;
  color: var(--paper-hi);
  margin-bottom: 6px;
}

.page-about .about-teams p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-signature {
  margin-top: 24px;
  border: 1px solid rgba(199, 154, 91, .55);
  background: var(--paper);
  color: var(--brown);
  padding: 18px 16px;
}

.page-about .about-signature__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--brick);
  margin-bottom: 10px;
}

.page-about .about-signature__name {
  font-family: var(--font-mono);
  font-size: 20px;
  letter-spacing: .02em;
  margin-bottom: 10px;
}

.page-about .about-signature p {
  color: var(--brown);
  font-size: 14px;
  line-height: 1.78;
}

.page-about .about-signature p.about-signature__name {
  font-size: 20px;
}

/* ===== 合作生态 ===== */
.page-about .about-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 18px 0 4px;
}

.page-about .about-chips .s3-tag {
  font-size: 12px;
}

.page-about .about-award {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 16px 0;
  margin: 22px 0 18px;
}

.page-about .about-award__year {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1.2;
  color: var(--orange);
  flex: 0 0 auto;
}

/* ===== 收尾 ===== */
.page-about .about-cta {
  border: 1px solid var(--line);
  background:
    linear-gradient(135deg, rgba(255, 138, 61, .14), transparent 58%),
    var(--ink-2);
  padding: 26px 18px;
}

.page-about .about-cta h2 {
  font-family: var(--font-narrow);
  font-weight: 800;
  font-size: clamp(1.4rem, 5.4vw, 2rem);
  line-height: 1.25;
  color: var(--paper-hi);
  margin-bottom: 10px;
}

.page-about .about-cta p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

/* ===== 中等屏 ===== */
@media (min-width: 640px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-teams {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 22px;
  }

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

  .page-about .about-cta {
    padding: 32px 28px;
  }
}

/* ===== 桌面 ===== */
@media (min-width: 920px) {
  .page-about .about-hero {
    padding: 34px 0 56px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .7fr);
    align-items: start;
    gap: 44px;
  }

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

  .page-about .about-shell {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 52px;
    padding-top: 52px;
  }

  .page-about .about-rail__stick {
    position: sticky;
    top: calc(var(--head-h) + 28px);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    position: relative;
    border: 0;
    background: none;
    padding: 11px 0 11px 20px;
    font-size: 14px;
    color: var(--muted);
  }

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

  .page-about .about-rail__link::after {
    content: "";
    position: absolute;
    left: -3px;
    top: 18px;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--line);
    transition: background .18s var(--ease);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: none;
    border-color: transparent;
    color: var(--cyan);
  }

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

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

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

  .page-about .about-teams {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .about-figure {
    margin-top: 28px;
  }

  .page-about .about-cta {
    padding: 40px 36px;
  }
}
<<<END>>>