.page-about {
  --about-pad: clamp(28px, 5vw, 56px);
  --about-shadow: 6px 6px 0 rgba(0, 0, 0, 0.55);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 5vw, 56px) 0 clamp(32px, 6vw, 72px);
  background:
    radial-gradient(115% 85% at 88% -10%, rgba(200, 247, 81, 0.12), transparent 62%),
    linear-gradient(180deg, var(--ink-800) 0%, var(--bg) 100%);
  border-bottom: 3px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -140px;
  width: 280px;
  height: 280px;
  border: 3px solid var(--line);
  transform: rotate(-6deg);
  pointer-events: none;
}

.page-about .about-hero .breadcrumb {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-bottom: 22px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .about-hero .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
}

.page-about .about-hero .breadcrumb a:hover,
.page-about .about-hero .breadcrumb a:focus-visible {
  color: var(--lime);
}

.page-about .about-hero .breadcrumb-sep {
  color: var(--line);
}

.page-about .about-hero .display {
  position: relative;
  z-index: 1;
  margin: 10px 0 0;
  max-width: 15em;
}

.page-about .about-hero .lede {
  position: relative;
  z-index: 1;
  margin-top: 18px;
  max-width: 34em;
  font-size: clamp(15px, 1.8vw, 17px);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-hero-facts {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 14px 34px;
  margin-top: clamp(24px, 4vw, 40px);
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-about .about-hero-fact {
  display: flex;
  align-items: baseline;
  gap: 9px;
}

.page-about .about-hero-fact .num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 500;
  color: var(--amber);
  letter-spacing: -0.02em;
}

.page-about .about-hero-fact span:last-child {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

/* ---------- 两栏骨架 ---------- */
.page-about .about-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 4vw, 48px);
  padding-top: var(--about-pad);
  padding-bottom: var(--about-pad);
}

@media (min-width: 900px) {
  .page-about .about-wrap {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    align-items: start;
  }
}

/* ---------- 左侧索引 ---------- */
.page-about .about-index {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-about .about-index-title {
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.page-about .about-index-list {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index-link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 8px 0;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

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

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

@media (min-width: 900px) {
  .page-about .about-index {
    position: sticky;
    top: 104px;
  }

  .page-about .about-index-list {
    flex-direction: column;
    gap: 0;
  }

  .page-about .about-index-link {
    border-bottom: 1px solid rgba(42, 68, 56, 0.55);
  }
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: clamp(28px, 4vw, 52px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-chapter:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-chapter-head {
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .about-chapter-head h2 {
  margin: 8px 0 0;
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.page-about .about-sub {
  margin: 10px 0 0;
  font-size: 14px;
  color: var(--muted);
}

.page-about .about-body p {
  max-width: 34em;
  line-height: 1.85;
  color: var(--text);
}

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

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
}

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .about-figure {
  margin: 0;
  border: 3px solid var(--line);
  background: var(--ink-700);
  box-shadow: var(--about-shadow);
  overflow: hidden;
}

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

.page-about .about-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 团队仪表盘 ---------- */
.page-about .team-board {
  margin-top: clamp(18px, 3vw, 28px);
  padding: clamp(18px, 3vw, 28px);
  border: 3px solid var(--line);
  background: linear-gradient(160deg, var(--ink-700) 0%, var(--ink-800) 100%);
  box-shadow: var(--about-shadow);
}

.page-about .team-total {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.page-about .team-total-num {
  font-family: var(--font-mono);
  font-size: clamp(46px, 9vw, 82px);
  font-weight: 500;
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: var(--amber);
}

.page-about .team-total-label {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .team-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 620px) {
  .page-about .team-split {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .team-split li {
  padding-left: 12px;
  border-left: 3px solid var(--lime-dim);
}

.page-about .team-split-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 500;
  line-height: 1.1;
  color: var(--lime);
}

.page-about .team-split-name {
  display: block;
  margin-top: 2px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
}

.page-about .team-split-desc {
  display: block;
  margin-top: 5px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 分段标签 ---------- */
.page-about .about-tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-tab {
  padding: 11px 16px;
  border: 3px solid var(--line);
  background: var(--ink-800);
  color: var(--muted);
  font: inherit;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.04em;
  cursor: pointer;
  transform: rotate(-1.5deg);
  transition: background 0.18s ease, color 0.18s ease, transform 0.18s ease;
}

.page-about .about-tab:hover {
  color: var(--text);
  border-color: var(--lime-dim);
}

.page-about .about-tab[aria-selected="true"] {
  background: var(--lime);
  border-color: var(--lime-dim);
  color: var(--on-accent);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.5);
  transform: rotate(-1.5deg) translateY(-2px);
}

.page-about .about-tab:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

.page-about .about-panel {
  margin-top: 0;
  padding: clamp(18px, 3vw, 28px);
  border: 3px solid var(--line);
  background: var(--ink-800);
}

.page-about .about-panel h3 {
  margin: 0 0 12px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-panel ul {
  margin: 0;
  padding-left: 18px;
}

.page-about .about-panel li {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-panel li + li {
  margin-top: 8px;
}

.page-about .about-panel li::marker {
  color: var(--lime-dim);
}

/* ---------- 时间线 ---------- */
.page-about .about-chapter--timeline {
  overflow: hidden;
}

.page-about .about-tl-bg {
  position: absolute;
  top: 8px;
  right: 0;
  width: min(44%, 340px);
  height: auto;
  opacity: 0.18;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-chapter--timeline > *:not(.about-tl-bg) {
  position: relative;
  z-index: 1;
}

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

.page-about .tl-item {
  position: relative;
  padding: 0 0 26px 30px;
  border-left: 1px solid var(--line);
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 9px;
  width: 12px;
  height: 12px;
  background: var(--amber);
  border: 2px solid var(--ink-900);
  transform: rotate(-12deg);
  box-shadow: 2px 2px 0 rgba(0, 0, 0, 0.5);
  transition: background 0.18s ease;
}

.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--amber);
}

.page-about .tl-item h3 {
  margin: 2px 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  transition: color 0.18s ease;
}

.page-about .tl-item p {
  margin: 0;
  max-width: 30em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .tl-item:hover::before,
.page-about .tl-item:focus-within::before {
  background: var(--lime);
}

.page-about .tl-item:hover h3,
.page-about .tl-item:focus-within h3 {
  color: var(--lime);
}

@media (min-width: 720px) {
  .page-about .tl-item:nth-child(2) {
    margin-left: 7%;
  }

  .page-about .tl-item:nth-child(3) {
    margin-left: 14%;
  }

  .page-about .tl-item:nth-child(4) {
    margin-left: 21%;
  }

  .page-about .tl-item:nth-child(5) {
    margin-left: 28%;
  }
}

/* ---------- 反色纸块 ---------- */
.page-about .about-paper {
  margin: clamp(26px, 4vw, 44px) 0;
  padding: clamp(24px, 4vw, 40px);
  background: var(--paper-raw);
  color: var(--ink-900);
  border: 3px solid var(--ink-900);
  box-shadow: var(--about-shadow);
}

.page-about .about-paper .eyebrow {
  color: var(--ink-700);
  letter-spacing: 0.2em;
}

.page-about .about-paper-text {
  margin: 10px 0 0;
  max-width: 30em;
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 500;
  line-height: 1.75;
  color: var(--ink-900);
}

/* ---------- 读者 ---------- */
.page-about .readers-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin: 0 0 clamp(18px, 3vw, 26px);
  padding: 0;
  list-style: none;
}

@media (min-width: 560px) {
  .page-about .readers-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .readers-grid li {
  padding-top: 14px;
  border-top: 3px solid var(--lime-dim);
}

.page-about .readers-num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 44px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--amber);
}

.page-about .readers-unit {
  margin-left: 4px;
  font-size: 0.48em;
  color: var(--muted);
}

.page-about .readers-label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  margin-top: clamp(28px, 4vw, 48px);
  padding-top: clamp(24px, 3vw, 36px);
  border-top: 3px solid var(--line);
}

.page-about .about-next h2 {
  margin: 0;
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  color: var(--text);
}

.page-about .about-next p {
  margin: 10px 0 0;
  max-width: 32em;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index-link,
  .page-about .about-tab,
  .page-about .tl-item::before,
  .page-about .tl-item h3 {
    transition: none;
  }
}
<<<END>>>