.page-about {
  --paper-ink: #1E1A13;
  --paper-ink-soft: rgba(30, 26, 19, 0.78);
  --paper-ink-dim: rgba(30, 26, 19, 0.54);
  --paper-line: rgba(30, 26, 19, 0.14);
  --paper-line-strong: rgba(30, 26, 19, 0.32);

  background-color: var(--c-paper);
  color: var(--paper-ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  padding-bottom: 0;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding: 26px 0 0;
}

.page-about .breadcrumbs__item {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--paper-ink-dim);
}

.page-about .breadcrumbs__link {
  color: var(--paper-ink-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .breadcrumbs__link:hover,
.page-about .breadcrumbs__link:focus-visible {
  color: var(--c-signal);
  border-bottom-color: var(--c-signal);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 18px;
  padding: 26px 0 40px;
  border-bottom: 1px solid var(--paper-line-strong);
}

.page-about .about-hero__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-signal);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.4rem, 11vw, 4.6rem);
  line-height: 1.02;
  letter-spacing: 0.01em;
  color: var(--paper-ink);
}

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

/* ---------- 关键数字 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 20px;
  margin: 6px 0 0;
  padding-top: 24px;
  border-top: 1px solid var(--paper-line);
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .about-stats__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--paper-ink-dim);
}

.page-about .about-stats__value {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
  color: var(--paper-ink);
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 6vw, 2.1rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--paper-ink);
}

.page-about .about-stats__unit {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--paper-ink-dim);
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

/* ---------- 侧边目录 ---------- */
.page-about .about-rail {
  padding: 24px 0 8px;
  border-bottom: 1px solid var(--paper-line);
}

.page-about .about-rail__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--paper-ink-dim);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 12px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 8px 16px;
  border: 1px solid var(--paper-line-strong);
  border-radius: var(--pill);
  font-size: 14px;
  color: var(--paper-ink-soft);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--paper-ink);
  border-color: var(--c-signal);
  background-color: rgba(255, 106, 26, 0.08);
}

.page-about .about-rail__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--c-signal);
}

/* ---------- 正文分节 ---------- */
.page-about .about-section {
  padding: 40px 0 36px;
  border-bottom: 1px solid var(--paper-line);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-section__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .about-section__idx {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-signal);
}

.page-about .about-section__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 6vw, 2.1rem);
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--paper-ink);
}

.page-about .about-body p {
  margin: 0 0 1.05em;
  max-width: 46em;
  color: var(--paper-ink-soft);
  line-height: 1.9;
}

.page-about .about-body p:last-child {
  margin-bottom: 0;
}

.page-about .about-inline-link {
  color: var(--paper-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--c-signal);
  padding-bottom: 1px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--c-signal);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 28px 0 30px;
  border: 1px solid var(--paper-line-strong);
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--c-tactical);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.6) contrast(1.14);
}

.page-about .about-figure figcaption {
  padding: 12px 18px;
  background-color: rgba(30, 26, 19, 0.05);
  border-top: 1px solid var(--paper-line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  line-height: 1.6;
  color: var(--paper-ink-dim);
}

/* ---------- 岗位配比 ---------- */
.page-about .ratio-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 26px;
}

.page-about .ratio-row {
  display: grid;
  gap: 10px;
}

.page-about .ratio-row__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
}

.page-about .ratio-row__name {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--paper-ink);
}

.page-about .ratio-row__value {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--c-signal);
}

.page-about .ratio-row__track {
  position: relative;
  height: 10px;
  border-radius: var(--pill);
  background-color: rgba(30, 26, 19, 0.1);
  overflow: hidden;
}

.page-about .ratio-row__fill {
  display: block;
  height: 100%;
  border-radius: var(--pill);
}

.page-about .ratio-row__fill--data {
  width: 38.9%;
  background-color: var(--c-moss);
}

.page-about .ratio-row__fill--clip {
  width: 25%;
  background-color: var(--c-signal);
}

.page-about .ratio-row__fill--edit {
  width: 36.1%;
  background-color: var(--c-umber);
}

.page-about .ratio-row__note {
  margin: 0;
  max-width: 44em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper-ink-dim);
}

/* ---------- 生产流程 ---------- */
.page-about .flow-list {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--paper-line);
}

.page-about .flow-step {
  border-bottom: 1px solid var(--paper-line);
}

.page-about .flow-step__box {
  display: block;
}

.page-about .flow-step__summary {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 56px;
  padding: 8px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--paper-ink);
}

.page-about .flow-step__summary::-webkit-details-marker {
  display: none;
}

.page-about .flow-step__summary::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 400;
  color: var(--c-signal);
  transition: transform 0.2s var(--ease);
}

.page-about .flow-step__box[open] > .flow-step__summary::after {
  content: "－";
}

.page-about .flow-step__summary:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.page-about .flow-step__idx {
  flex: none;
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 2px;
  background-color: var(--c-signal);
  font-size: 0;
  line-height: 0;
  text-indent: -9999px;
  overflow: hidden;
}

.page-about .flow-step__body {
  padding: 0 0 20px;
}

.page-about .flow-step__body p {
  margin: 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.9;
  color: var(--paper-ink-soft);
}

/* ---------- 版本时间线 ---------- */
.page-about .phase-list {
  position: relative;
  margin: 0;
  padding: 0 0 0 22px;
  list-style: none;
  display: grid;
  gap: 30px;
  border-left: 1px solid var(--paper-line-strong);
}

.page-about .phase-item {
  position: relative;
  display: grid;
  gap: 6px;
}

.page-about .phase-item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 2px;
  background-color: var(--c-signal);
  box-shadow: 0 0 0 3px var(--c-paper);
}

.page-about .phase-item__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--paper-ink-dim);
}

.page-about .phase-item__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--paper-ink);
}

.page-about .phase-item p {
  margin: 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-ink-soft);
}

/* ---------- 服务对象 ---------- */
.page-about .audience-list {
  display: grid;
  gap: 0;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--paper-line);
}

.page-about .audience-item {
  display: grid;
  gap: 6px;
  padding: 20px 0;
  border-bottom: 1px solid var(--paper-line);
}

.page-about .audience-item__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--paper-ink);
}

.page-about .audience-item__text {
  margin: 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-ink-soft);
}

/* ---------- 合作网络 ---------- */
.page-about .about-partners {
  margin-top: 30px;
  padding: 22px 20px;
  border: 1px solid var(--paper-line-strong);
  border-radius: var(--radius-md);
  background-color: rgba(30, 26, 19, 0.035);
}

.page-about .about-partners__lead {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--paper-ink-dim);
}

.page-about .about-partners__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-partners__item {
  display: flex;
  align-items: baseline;
  gap: 8px;
  min-width: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper-ink-soft);
}

.page-about .about-partners__item .about-num {
  font-size: 1.5rem;
  color: var(--c-signal);
}

.page-about .about-partners__note {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--paper-line);
  max-width: 46em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper-ink-dim);
}

/* ---------- 准则列表 ---------- */
.page-about .rule-list {
  display: grid;
  gap: 22px;
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .rule-item {
  display: grid;
  gap: 6px;
  padding-left: 20px;
  border-left: 2px solid var(--c-moss);
}

.page-about .rule-item__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--paper-ink);
}

.page-about .rule-item__text {
  margin: 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-ink-soft);
}

/* ---------- 行动区 ---------- */
.page-about .about-cta {
  margin-top: 48px;
  background-color: var(--c-tactical);
  color: var(--c-white);
  clip-path: polygon(0 0, 100% 32px, 100% 100%, 0 100%);
  padding: 76px 0 60px;
}

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

.page-about .about-cta__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.7rem, 7vw, 2.6rem);
  line-height: 1.15;
  color: var(--c-white);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 247, 243, 0.78);
}

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

.page-about .about-cta__actions .btn {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.page-about .about-cta__actions .btn--ghost {
  border: 1px solid rgba(244, 247, 243, 0.42);
  color: var(--c-white);
  background-color: transparent;
}

.page-about .about-cta__actions .btn--ghost:hover,
.page-about .about-cta__actions .btn--ghost:focus-visible {
  border-color: var(--c-cyan);
  color: var(--c-cyan);
}

/* ---------- 收尾图 ---------- */
.page-about .about-signoff {
  margin: 48px 0 0;
  max-width: 420px;
  border: 1px solid var(--paper-line-strong);
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--c-tactical);
}

.page-about .about-signoff img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.55) contrast(1.18);
}

.page-about .about-signoff figcaption {
  padding: 14px 18px 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-white);
  background-color: var(--c-tactical);
  border-top: 1px solid rgba(244, 247, 243, 0.14);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

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

  .page-about .audience-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 40px;
  }

  .page-about .audience-item {
    border-bottom: 1px solid var(--paper-line);
  }

  .page-about .about-signoff {
    max-width: 480px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 14px 60px;
    align-items: end;
    padding: 34px 0 52px;
  }

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

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

  .page-about .about-hero__lead {
    grid-column: 2;
    font-size: 16.5px;
    padding-bottom: 6px;
  }

  .page-about .about-stats {
    grid-column: 1 / -1;
    margin-top: 14px;
  }

  .page-about .about-section {
    padding: 52px 0 48px;
  }

  .page-about .about-cta {
    padding: 92px 0 72px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: 190px minmax(0, 1fr);
    column-gap: 64px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 32px);
    padding: 48px 0 0;
    border-bottom: 0;
    align-self: start;
  }

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

  .page-about .about-rail__link {
    min-height: 0;
    padding: 11px 0 11px 14px;
    border: 0;
    border-left: 2px solid var(--paper-line-strong);
    border-radius: 0;
    white-space: normal;
    line-height: 1.5;
    transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background-color: transparent;
    border-left-color: var(--c-signal);
    color: var(--paper-ink);
  }

  .page-about .about-body {
    padding-top: 48px;
  }

  .page-about .about-body p,
  .page-about .flow-step__body p {
    font-size: 16px;
  }

  .page-about .about-figure--wide {
    margin-top: 32px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__lead,
  .page-about .about-body p {
    max-width: 48em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}