.page-about {
  --about-pad: clamp(56px, 8vw, 120px);
  --about-line: 1px solid var(--grid);
  --about-line-bold: 2px solid var(--grid);
  --about-gap: clamp(20px, 3vw, 40px);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about a {
  color: inherit;
}

.page-about .about-lead {
  max-width: 62ch;
  margin: 0 0 clamp(28px, 4vw, 44px);
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- Hero ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 3vw, 36px) 0 clamp(36px, 5vw, 56px);
  border-bottom: var(--about-line-bold);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(0deg, var(--grid) 0 1px, transparent 1px 76px),
    linear-gradient(90deg, transparent 0 63%, rgba(53, 245, 208, 0.10) 63% 63.25%, transparent 63.25%);
  opacity: 0.7;
  pointer-events: none;
}

.page-about .about-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-hero .chip {
  display: inline-block;
  margin: 0;
  color: var(--cyan);
  border: 1px solid var(--cyan-deep);
  background: rgba(53, 245, 208, 0.06);
  padding: 5px 10px;
}

.page-about .about-hero__title {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 5.4vw, 64px);
  line-height: 0.98;
  letter-spacing: -0.01em;
  max-width: 20ch;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: clamp(18px, 3vw, 28px) 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--paper);
  opacity: 0.88;
}

.page-about .about-hero__facts {
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: var(--about-line);
  border-left: var(--about-line);
}

.page-about .about-hero__fact {
  padding: 14px 16px 16px;
  border-right: var(--about-line);
  border-bottom: var(--about-line);
  background: var(--panel);
}

.page-about .about-hero__fact-label {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-hero__fact-value {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1;
  color: var(--cyan);
}

/* ---------- 章节索引 ---------- */

.page-about .about-index {
  background: var(--panel);
  border-bottom: var(--about-line-bold);
}

.page-about .about-index__inner {
  display: flex;
  gap: 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-index__link {
  flex: 0 0 auto;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 18px;
  border-right: var(--about-line);
  text-decoration: none;
  font-size: 13px;
  color: var(--muted);
  transition: color 0.18s ease, background-color 0.18s ease;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--cyan);
  background: rgba(53, 245, 208, 0.07);
}

.page-about .about-index__num {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

/* ---------- 通用章节 ---------- */

.page-about .about-sec {
  padding: var(--about-pad) 0;
  border-bottom: var(--about-line);
}

.page-about .about-head {
  margin-bottom: clamp(24px, 3.5vw, 40px);
}

.page-about .about-sec--cta {
  border-bottom: 0;
}

/* ---------- 时间卷 ---------- */

.page-about .tl-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  padding: 22px 0;
  border-top: var(--about-line);
}

.page-about .tl-item:last-child {
  border-bottom: var(--about-line);
}

.page-about .tl-item__year {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(28px, 4.4vw, 44px);
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--muted);
}

.page-about .tl-item--now .tl-item__year {
  color: var(--cyan);
}

.page-about .tl-item__body {
  min-width: 0;
}

.page-about .tl-item__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.2vw, 24px);
  line-height: 1.25;
  color: var(--paper);
}

.page-about .tl-item__text {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .tl-item__tag {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--orange);
  align-self: end;
}

/* ---------- 团队 ---------- */

.page-about .about-banner {
  margin: 0 0 clamp(28px, 4vw, 44px);
}

.page-about .about-banner .figure__media {
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.page-about .figure__media img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-banner .figure__media img {
  height: 100%;
  object-fit: cover;
}

.page-about .about-banner .figure__caption,
.page-about .about-flowchart .figure__caption,
.page-about .figure__caption {
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .role-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .role-card {
  padding: 20px 20px 22px;
  background: var(--panel);
  border: var(--about-line-bold);
  box-shadow: var(--shadow-hard);
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

.page-about .role-card:hover {
  border-color: var(--cyan);
  transform: translate(2px, 2px);
  box-shadow: var(--shadow-press);
}

.page-about .role-card__idx {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .role-card__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.2;
  color: var(--paper);
}

.page-about .role-card__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 数据流程 ---------- */

.page-about .flow {
  list-style: none;
  margin: 0 0 clamp(28px, 4vw, 44px);
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .flow__step {
  position: relative;
  padding: 18px 0 18px 26px;
  border-left: var(--about-line-bold);
}

.page-about .flow__step::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 24px;
  width: 8px;
  height: 8px;
  background: var(--cyan);
  border-radius: 50%;
}

.page-about .flow__step:last-child {
  border-left-color: var(--cyan-deep);
}

.page-about .flow__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--paper);
}

.page-about .flow__text {
  margin: 8px 0 0;
  max-width: 44ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .data-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-flowchart {
  margin: 0;
  border: var(--about-line-bold);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
}

.page-about .about-flowchart .figure__media {
  border-bottom: var(--about-line);
  overflow: hidden;
}

.page-about .about-flowchart .figure__caption {
  padding: 12px 16px 14px;
  margin: 0;
}

.page-about .data-notes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  align-content: start;
}

.page-about .data-note {
  padding: 18px 20px;
  background: var(--panel);
  border: var(--about-line-bold);
  border-left: 4px solid var(--cyan);
}

.page-about .data-note--orange {
  border-left-color: var(--orange);
}

.page-about .data-note__value {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(28px, 4vw, 38px);
  line-height: 1;
  color: var(--paper);
}

.page-about .data-note--orange .data-note__value {
  color: var(--orange);
}

.page-about .data-note__label {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .data-note__foot {
  margin: 6px 0 0;
  padding: 16px 18px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  border: 1px dashed var(--grid);
}

/* ---------- 版本演进 ---------- */

.page-about .versions-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .versions-main {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  align-content: start;
}

.page-about .lane {
  padding: 18px 18px 20px;
  background: var(--panel);
  border: var(--about-line-bold);
}

.page-about .lane__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: var(--about-line);
}

.page-about .lane__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  color: var(--paper);
}

.page-about .lane__code {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .lane__track {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .lane__node {
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
}

.page-about .lane__dot {
  width: 8px;
  height: 8px;
  margin-top: 7px;
  background: var(--orange);
  border-radius: 50%;
}

.page-about .lane__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper);
  opacity: 0.86;
}

.page-about .versions-aside {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  align-content: start;
}

.page-about .versions-aside .figure {
  margin: 0;
  border: var(--about-line-bold);
  background: var(--panel);
}

.page-about .versions-aside .figure__media {
  overflow: hidden;
}

.page-about .versions-aside .figure__caption {
  padding: 12px 16px 14px;
  margin: 0;
}

.page-about .shadow-box {
  padding: 18px 20px;
  background: var(--cyan-deep);
  border: var(--about-line-bold);
  box-shadow: var(--shadow-hard);
}

.page-about .shadow-box__num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 40px;
  line-height: 1;
  color: var(--paper);
}

.page-about .shadow-box__text {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--paper);
  opacity: 0.9;
}

/* ---------- 使用规模 ---------- */

.page-about .scale-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-about .scale-block {
  padding: 20px 16px 22px;
  background: var(--panel);
  border: var(--about-line-bold);
}

.page-about .scale-block--reverse {
  background: var(--reverse);
  color: var(--ink);
}

.page-about .scale-block--accent {
  background: var(--cyan-deep);
}

.page-about .scale-block__num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1;
  letter-spacing: -0.01em;
}

.page-about .scale-block--reverse .scale-block__num {
  color: var(--ink);
}

.page-about .scale-block--accent .scale-block__num {
  color: var(--paper);
}

.page-about .scale-block:not(.scale-block--reverse):not(.scale-block--accent) .scale-block__num {
  color: var(--cyan);
}

.page-about .scale-block__label {
  margin: 12px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .scale-block--reverse .scale-block__label {
  color: #3d474f;
}

.page-about .scale-block--accent .scale-block__label {
  color: rgba(234, 239, 243, 0.82);
}

.page-about .scale-notes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.5vw, 32px);
}

.page-about .scale-notes__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 合作来源 ---------- */

.page-about .partner-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .partner-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about .partner-item {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 22px 0;
  border-top: var(--about-line);
}

.page-about .partner-item:last-child {
  border-bottom: var(--about-line);
}

.page-about .partner-item__num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(24px, 3.2vw, 34px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .partner-item__body {
  min-width: 0;
}

.page-about .partner-item__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .partner-item__text {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .partner-aside {
  padding: 22px 20px 24px;
  background: var(--panel);
  border: var(--about-line-bold);
  border-top: 4px solid var(--orange);
  align-self: start;
}

.page-about .partner-aside__kicker {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .partner-aside__text {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  padding: clamp(24px, 4vw, 40px);
  background: var(--panel);
  border: var(--about-line-bold);
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1.1;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 28px);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

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

  .page-about .data-note__foot {
    grid-column: 1 / -1;
  }
}

@media (min-width: 880px) {
  .page-about .tl-item {
    grid-template-columns: 148px minmax(0, 1fr) 90px;
    gap: 32px;
    align-items: start;
    padding: 34px 0;
  }

  .page-about .tl-item__year {
    text-align: left;
  }

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

  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    border-top: var(--about-line-bold);
  }

  .page-about .flow__step {
    border-left: 0;
    border-right: var(--about-line);
    padding: 30px 22px 4px;
  }

  .page-about .flow__step:last-child {
    border-right: 0;
  }

  .page-about .flow__step::before {
    left: 22px;
    top: -5px;
  }

  .page-about .data-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .versions-wrap {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
  }

  .page-about .partner-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 1100px) {
  .page-about .versions-main {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-cta {
    display: grid;
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-cta__title {
    grid-column: 1;
  }

  .page-about .about-cta__text {
    grid-column: 2;
    margin-top: 0;
  }

  .page-about .about-cta__links {
    grid-column: 2;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role-card,
  .page-about .about-index__link {
    transition: none;
  }
}
</PAGE_CSS>>>