.page-about {
  --about-line: rgba(143, 179, 170, 0.24);
  --about-line-soft: rgba(143, 179, 170, 0.12);
  --about-ink-line: rgba(16, 24, 32, 0.14);
  --about-wash: rgba(143, 179, 170, 0.07);
  color: var(--paper);
  font-family: var(--font-sans);
  padding-bottom: 56px;
  overflow-x: hidden;
}

.page-about .shell {
  padding-left: 18px;
  padding-right: 18px;
}

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

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0 0 8px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 18px 0 8px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 26px;
  align-items: start;
}

.page-about .about-hero h1 {
  margin: 0;
  font-size: clamp(30px, 8vw, 52px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  font-weight: 800;
}

.page-about .about-hero__lede {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper-dim);
  max-width: 36em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-figure {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: linear-gradient(150deg, var(--ink-700), var(--ink-900));
  box-shadow: var(--shadow-panel);
  border: 1px solid var(--about-line-soft);
}

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

.page-about .about-figure figcaption {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--mist);
  padding: 10px 14px;
  background: var(--ink-900);
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-hero__media {
  margin: 0;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: 52px 0;
  position: relative;
}

.page-about .about-chapter__head {
  margin-bottom: 28px;
}

.page-about .chapter-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(46px, 13vw, 96px);
  line-height: 0.82;
  letter-spacing: -0.05em;
  color: rgba(201, 162, 39, 0.16);
  -webkit-text-stroke: 1px rgba(201, 162, 39, 0.55);
  margin-bottom: 10px;
}

.page-about .about-chapter h2 {
  margin: 0;
  font-size: clamp(23px, 5.2vw, 36px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  font-weight: 800;
  max-width: 26em;
}

.page-about .about-chapter__lede {
  margin: 12px 0 0;
  font-size: 15.5px;
  line-height: 1.88;
  color: var(--paper-dim);
  max-width: 40em;
}

/* 纸白分区 */
.page-about .about-chapter--paper {
  background: linear-gradient(180deg, var(--paper) 0%, var(--paper-dim) 100%);
  color: var(--coal);
  border-radius: var(--radius-lg);
  padding: 42px 0;
  margin: 12px 0;
}

.page-about .about-chapter--paper h2 {
  color: var(--coal);
}

.page-about .about-chapter--paper .about-chapter__lede {
  color: var(--steel);
}

.page-about .about-chapter--paper .eyebrow {
  color: #8a6d14;
}

.page-about .about-chapter--paper .chapter-num {
  color: rgba(16, 24, 32, 0.06);
  -webkit-text-stroke: 1px rgba(16, 24, 32, 0.28);
}

/* 下沉分区 */
.page-about .about-chapter--sunk {
  background: var(--ink-900);
  border-radius: var(--radius-lg);
  padding: 42px 0;
  margin: 12px 0;
  border: 1px solid var(--about-line-soft);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl-node {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 18px;
  padding-bottom: 30px;
}

.page-about .tl-node:last-child {
  padding-bottom: 0;
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-size: clamp(19px, 4.6vw, 30px);
  letter-spacing: 0.01em;
  color: var(--gold);
  padding-top: 2px;
  transition: color 240ms var(--ease);
}

.page-about .tl-body {
  position: relative;
  border-left: 1px solid var(--about-line);
  padding-left: 18px;
  padding-bottom: 4px;
}

.page-about .tl-node:last-child .tl-body {
  border-left-color: transparent;
}

.page-about .tl-body::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1.5px solid var(--gold);
  background: var(--ink-800);
  transition: background 240ms var(--ease), box-shadow 240ms var(--ease);
}

.page-about .tl-node:hover .tl-body::before,
.page-about .tl-node:focus-within .tl-body::before {
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(201, 162, 39, 0.16);
}

.page-about .tl-node:hover .tl-year {
  color: var(--amber);
}

.page-about .tl-body h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.5;
}

.page-about .tl-body p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-dim);
  max-width: 38em;
}

.page-about .tl-tag {
  display: inline-block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--mist);
  border: 1px solid var(--about-line);
  border-radius: var(--pill);
  padding: 3px 11px;
}

/* ---------- 数据条 ---------- */
.page-about .about-stats {
  display: grid;
  gap: 2px;
}

.page-about .stat {
  padding: 20px 0 6px;
  border-top: 1px solid var(--about-ink-line);
}

.page-about .stat:first-child {
  border-top: 0;
  padding-top: 4px;
}

.page-about .stat__top {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.page-about .stat__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 6.6vw, 38px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--coal);
}

.page-about .stat__label {
  font-size: 13.5px;
  letter-spacing: 0.04em;
  color: var(--steel);
}

.page-about .about-bar {
  height: 8px;
  border-radius: var(--pill);
  background: rgba(16, 24, 32, 0.09);
  overflow: hidden;
  margin: 14px 0 10px;
}

.page-about .about-bar__fill {
  display: block;
  height: 100%;
  width: var(--w, 50%);
  border-radius: inherit;
  background: linear-gradient(90deg, var(--gold), var(--amber));
}

.page-about .about-bar--a { --w: 94%; }
.page-about .about-bar--b { --w: 63%; }
.page-about .about-bar--c { --w: 78%; }
.page-about .about-bar--d { --w: 86%; }

.page-about .stat__note {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--steel);
  max-width: 34em;
}

.page-about .stat__more {
  margin-top: 8px;
  border-left: 2px solid rgba(201, 162, 39, 0.55);
  padding-left: 12px;
}

.page-about .stat__more summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--coal);
  padding: 3px 0;
  list-style-position: inside;
}

.page-about .stat__more p {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: #4a5763;
}

/* ---------- 双栏区块 ---------- */
.page-about .about-split {
  display: grid;
  gap: 26px;
}

.page-about .about-split__media {
  margin: 0;
}

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

.page-about .about-points li {
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  background: var(--about-wash);
  border-left: 3px solid var(--gold);
}

.page-about .about-points__k {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
  margin-bottom: 6px;
}

.page-about .about-points p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--paper-dim);
}

.page-about .about-split__cta {
  margin-top: 20px;
}

/* 索引结构示意 */
.page-about .about-diagram-wrap {
  margin-top: 30px;
  padding: 22px 16px 16px;
  border-radius: var(--radius-md);
  background: linear-gradient(160deg, rgba(20, 52, 77, 0.9), rgba(7, 18, 30, 0.95));
  border: 1px solid var(--about-line-soft);
}

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

.page-about .dg-box {
  fill: rgba(20, 52, 77, 0.95);
  stroke: rgba(143, 179, 170, 0.55);
  stroke-width: 1;
}

.page-about .dg-box--paper {
  fill: rgba(244, 241, 234, 0.07);
  stroke: rgba(201, 162, 39, 0.85);
}

.page-about .dg-link {
  fill: none;
  stroke: rgba(143, 179, 170, 0.75);
  stroke-width: 1.2;
  stroke-dasharray: 5 5;
}

.page-about .dg-dot {
  fill: var(--gold);
}

.page-about .dg-text {
  fill: var(--paper);
  font-family: var(--font-mono);
  font-size: 16px;
  letter-spacing: 0.04em;
}

.page-about .dg-sub {
  fill: var(--mist);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
}

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

.page-about .about-roles li {
  padding: 13px 15px;
  border-radius: var(--radius-sm);
  background: rgba(78, 143, 124, 0.1);
  border-left: 3px solid var(--celadon);
}

.page-about .about-roles strong {
  display: block;
  font-size: 15px;
  letter-spacing: 0.02em;
  margin-bottom: 4px;
}

.page-about .about-roles span {
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--paper-dim);
}

.page-about .about-team__note {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-dim);
  max-width: 34em;
}

.page-about .about-roles + .about-team__note,
.page-about .about-team__note + .about-team__note {
  margin-top: 14px;
}

.page-about .about-split--team .btn {
  margin-top: 20px;
}

/* ---------- 巡检 ---------- */
.page-about .about-checks {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-check {
  flex: 1 1 200px;
  padding: 16px 16px 14px;
  border-radius: var(--radius-sm);
  background: rgba(11, 27, 43, 0.72);
  border: 1px solid var(--about-line-soft);
}

.page-about .about-check:nth-child(2) {
  flex-grow: 1.3;
}

.page-about .about-check__k {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--celadon);
  margin-bottom: 8px;
}

.page-about .about-check p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--paper-dim);
}

.page-about .about-checks__foot {
  margin: 22px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-dim);
  max-width: 40em;
}

.page-about .about-link {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 163, 58, 0.45);
  padding-bottom: 1px;
}

.page-about .about-link:hover {
  border-bottom-color: var(--amber);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  padding: 40px 0 12px;
}

.page-about .about-cta__box {
  border: 1px solid var(--about-line);
  border-radius: var(--radius-lg);
  padding: 30px 20px;
  background:
    radial-gradient(120% 140% at 12% 0%, rgba(201, 162, 39, 0.14), transparent 58%),
    linear-gradient(160deg, rgba(20, 52, 77, 0.72), rgba(7, 18, 30, 0.9));
  text-align: left;
}

.page-about .about-cta__box h2 {
  margin: 0;
  font-size: clamp(22px, 5vw, 32px);
  line-height: 1.32;
  letter-spacing: -0.01em;
  font-weight: 800;
  max-width: 24em;
}

.page-about .about-cta__text {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-dim);
  max-width: 38em;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-cta__line {
  margin: 22px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .shell {
    padding-left: 32px;
    padding-right: 32px;
  }

  .page-about .about-hero {
    padding: 30px 0 12px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.82fr);
    gap: 40px;
    align-items: center;
  }

  .page-about .about-hero__media {
    transform: translateY(18px);
  }

  .page-about .about-chapter {
    padding: 68px 0;
  }

  .page-about .about-chapter--paper,
  .page-about .about-chapter--sunk {
    padding: 52px 0;
  }

  .page-about .tl-node {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: 28px;
    padding-bottom: 38px;
  }

  .page-about .tl-body {
    padding-left: 24px;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 48px;
  }

  .page-about .stat:nth-child(2) {
    border-top: 0;
    padding-top: 4px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-split--team {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  }

  .page-about .about-diagram-wrap {
    padding: 28px 26px 22px;
  }

  .page-about .about-cta__box {
    padding: 40px 36px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero h1 {
    font-size: 54px;
  }

  .page-about .about-hero__grid {
    gap: 52px;
  }

  .page-about .chapter-num {
    font-size: 104px;
  }

  .page-about .about-stats {
    column-gap: 64px;
  }

  .page-about .about-checks {
    gap: 16px;
  }

  .page-about .about-chapter--paper,
  .page-about .about-chapter--sunk {
    padding: 60px 0;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .page-about .about-bar__fill {
    transition: width 520ms var(--ease);
  }
}
<<<PAGE_CSS_END>>>
</main>