.page-about {
  --about-line: rgba(138, 110, 47, 0.38);
  --about-line-soft: rgba(138, 110, 47, 0.22);
  --about-soft: rgba(247, 244, 238, 0.72);
  --about-soft-dim: rgba(247, 244, 238, 0.58);
  background: var(--warm-a);
  color: var(--ink);
  overflow-x: hidden;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--topbar-h) + 28px) 0 0;
  background: linear-gradient(162deg, var(--warm-a) 0%, var(--warm-b) 100%);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero__main {
  display: grid;
  gap: 22px;
  padding: 26px 0 34px;
}

.page-about .about-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold-line);
  margin: 0 0 12px;
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(44px, 13vw, 116px);
  line-height: 1.02;
  letter-spacing: 0.06em;
  color: var(--ink);
}

.page-about .about-hero__lead {
  margin: 0 0 20px;
  font-size: 16px;
  line-height: 1.8;
  letter-spacing: 0.01em;
  color: #232428;
  max-width: 34em;
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  border-top: 1px solid var(--about-line);
  padding-top: 16px;
}

.page-about .about-facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-facts__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 5vw, 28px);
  line-height: 1.1;
  color: var(--ink);
  letter-spacing: 0.02em;
}

.page-about .about-facts__label {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--slate);
}

.page-about .about-hero__vert {
  display: none;
}

.page-about .about-index {
  border-top: 1px solid var(--about-line);
  padding: 16px 0 22px;
}

.page-about .about-index ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 16px;
}

.page-about .about-index a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--vermilion);
  border-bottom-color: var(--vermilion);
}

.page-about .about-index__no {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gold-line);
  letter-spacing: 0.08em;
}

/* ---------- 章节骨架 ---------- */
.page-about .sec {
  padding: 46px 0;
}

.page-about .sec--warm-a {
  background: var(--warm-a);
}

.page-about .sec--warm-b {
  background: linear-gradient(180deg, var(--warm-b) 0%, var(--warm-a) 100%);
}

.page-about .sec--paper {
  background: var(--paper);
}

.page-about .sec--ink {
  background: var(--ink);
  color: var(--paper);
}

.page-about .sec__grid {
  display: grid;
  gap: 8px;
}

.page-about .sec__mark {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 4px;
}

.page-about .sec__no {
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--gold-line);
}

.page-about .sec__tick {
  display: none;
}

.page-about .sec--ink .sec__no {
  color: var(--gold);
}

.page-about .sec--ink .about-kicker {
  color: var(--gold-hi);
}

.page-about .sec__title {
  margin: 0 0 18px;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(25px, 5.2vw, 42px);
  line-height: 1.22;
  letter-spacing: 0.035em;
}

.page-about .sec--ink .sec__title {
  color: var(--paper);
}

.page-about .sec__sub {
  margin: 34px 0 0;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--paper);
  padding-top: 20px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-p {
  margin: 0 0 1.05em;
  font-size: 16px;
  line-height: 1.8;
  letter-spacing: 0.01em;
  color: #26272b;
  max-width: 36em;
}

.page-about .about-p--mt {
  margin-top: 1.6em;
}

.page-about .sec--ink .about-p {
  color: var(--about-soft);
}

.page-about .inline-link {
  color: var(--vermilion);
  text-decoration: none;
  border-bottom: 1px solid rgba(185, 58, 44, 0.4);
}

.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  color: var(--vermilion-dark);
  border-bottom-color: var(--vermilion-dark);
}

/* ---------- 引文 ---------- */
.page-about .pullquote {
  margin: 26px 0 0;
  padding: 20px 22px;
  background: var(--paper);
  border-left: 3px solid var(--vermilion);
  font-size: 15px;
  line-height: 1.85;
  color: #232428;
  max-width: 34em;
}

/* ---------- 三层方法 ---------- */
.page-about .method-body {
  display: grid;
  gap: 26px;
  margin-top: 26px;
}

.page-about .layers {
  display: grid;
  gap: 14px;
}

.page-about .layer {
  background: var(--ink-2);
  border: 1px solid rgba(200, 162, 74, 0.42);
  border-left: 3px solid var(--gold);
  padding: 20px 20px 22px;
}

.page-about .layer__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--gold);
}

.page-about .layer__name {
  margin: 8px 0 10px;
  font-size: 19px;
  line-height: 1.4;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .layer p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-soft);
}

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

.page-about .about-figure .media {
  border: 1px solid var(--about-line);
}

.page-about .sec--ink .about-figure .media {
  border-color: rgba(200, 162, 74, 0.32);
}

.page-about .media__caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.06em;
  color: var(--slate);
}

.page-about .sec--ink .media__caption {
  color: var(--about-soft-dim);
}

/* ---------- 步骤 ---------- */
.page-about .steps {
  counter-reset: step;
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  max-width: 36em;
}

.page-about .steps li {
  position: relative;
  padding: 15px 0 15px 46px;
  border-top: 1px solid rgba(200, 162, 74, 0.28);
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-soft);
}

.page-about .steps li::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 18px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 34px 0 0;
  padding: 0 0 0 26px;
  display: flex;
  flex-direction: column;
  gap: 26px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: var(--gold-line);
}

.page-about .tl-item {
  position: relative;
}

.page-about .tl-item::after {
  content: "";
  position: absolute;
  left: -26px;
  top: 6px;
  width: 11px;
  height: 11px;
  background: var(--gold);
}

.page-about .tl-item__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 16px;
  letter-spacing: 0.1em;
  color: var(--gold-hi);
}

.page-about .tl-item__title {
  margin: 6px 0 8px;
  font-size: 17px;
  line-height: 1.4;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .tl-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-soft);
  max-width: 30em;
}

/* ---------- 团队 ---------- */
.page-about .crew {
  display: grid;
  gap: 20px;
  margin-top: 28px;
}

.page-about .crew__card {
  border-top: 2px solid var(--ink);
  padding-top: 14px;
}

.page-about .crew__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1.1;
  color: var(--gold-line);
}

.page-about .crew__name {
  margin: 8px 0 8px;
  font-size: 17px;
  letter-spacing: 0.06em;
  color: var(--ink);
}

.page-about .crew__card p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: #3a3b40;
}

/* ---------- 指标 ---------- */
.page-about .stats {
  display: grid;
  gap: 22px 18px;
  margin: 28px 0 0;
}

.page-about .stat {
  border-top: 1px solid rgba(200, 162, 74, 0.45);
  padding-top: 12px;
}

.page-about .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 4.6vw, 34px);
  line-height: 1.15;
  letter-spacing: 0.01em;
  color: var(--gold-hi);
}

.page-about .stat__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--about-soft-dim);
}

/* ---------- 生态 ---------- */
.page-about .eco {
  display: grid;
  gap: 16px;
  margin-top: 26px;
}

.page-about .eco__card {
  background: var(--paper);
  border: 1px solid var(--about-line);
  padding: 20px;
}

.page-about .eco__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--vermilion);
}

.page-about .eco__name {
  margin: 8px 0 10px;
  font-size: 18px;
  letter-spacing: 0.05em;
  color: var(--ink);
}

.page-about .eco__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: #3a3b40;
}

/* ---------- 版本对照 ---------- */
.page-about .versions {
  display: grid;
  gap: 16px;
  margin-top: 26px;
}

.page-about .version {
  background: #fffdf9;
  border: 1px solid var(--about-line-soft);
  border-top: 2px solid var(--gold-line);
  padding: 20px;
}

.page-about .version--current {
  border-top-color: var(--vermilion);
}

.page-about .version__tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--slate);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.page-about .version__name {
  margin: 0 0 10px;
  font-size: 17px;
  line-height: 1.45;
  letter-spacing: 0.04em;
  color: var(--ink);
}

.page-about .version p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: #3a3b40;
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  background: var(--warm-a);
  padding: 42px 0 60px;
}

.page-about .about-cta__inner {
  border-top: 1px solid var(--about-line);
  padding-top: 26px;
  display: grid;
  gap: 20px;
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-size: clamp(22px, 4.4vw, 32px);
  line-height: 1.3;
  letter-spacing: 0.04em;
  color: var(--ink);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-index ol {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 860px) {
  .page-about .sec {
    padding: 68px 0;
  }

  .page-about .about-hero__main {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
    column-gap: 48px;
    padding: 44px 0 56px;
  }

  .page-about .about-hero__vert {
    display: block;
    position: absolute;
    right: 22px;
    top: calc(var(--topbar-h) + 88px);
    writing-mode: vertical-rl;
    margin: 0;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.34em;
    color: var(--gold-line);
    pointer-events: none;
  }

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

  .page-about .sec__grid {
    grid-template-columns: 88px minmax(0, 1fr);
    column-gap: 40px;
  }

  .page-about .sec__mark {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 0;
  }

  .page-about .sec__no {
    font-size: 44px;
  }

  .page-about .sec__tick {
    display: block;
    width: 1px;
    height: 58px;
    background: var(--gold-line);
  }

  .page-about .timeline {
    padding-left: 0;
    gap: 44px;
    margin-top: 44px;
  }

  .page-about .timeline::before {
    left: 50%;
  }

  .page-about .tl-item {
    width: calc(50% - 36px);
  }

  .page-about .tl-item:nth-child(odd) {
    align-self: flex-start;
    text-align: right;
  }

  .page-about .tl-item:nth-child(even) {
    align-self: flex-end;
  }

  .page-about .tl-item:nth-child(odd) p {
    margin-left: auto;
    margin-right: 0;
  }

  .page-about .tl-item:nth-child(odd)::after {
    left: auto;
    right: -31px;
  }

  .page-about .tl-item:nth-child(even)::after {
    left: -31px;
  }

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

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

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    column-gap: 40px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-index ol {
    grid-template-columns: repeat(7, minmax(0, 1fr));
  }

  .page-about .method-body {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    column-gap: 44px;
    align-items: start;
  }

  .page-about .layer:nth-child(2) {
    margin-left: 10%;
  }

  .page-about .layer:nth-child(3) {
    margin-left: 20%;
  }

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

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