.page-about {
  --about-ink: #14181A;
  --about-muted: rgba(58, 70, 64, 0.78);
  --about-hairline: rgba(58, 70, 64, 0.3);
}

.page-about .tx-breadcrumb {
  padding: 18px 0 4px;
}

/* ---------- 首屏 · 封面 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 26px 0 54px;
}

.page-about .about-hero__grid {
  align-items: end;
  row-gap: 30px;
}

.page-about .about-hero__title {
  margin: 12px 0 18px;
  font-size: clamp(38px, 8.6vw, 76px);
  font-weight: 300;
  line-height: 0.98;
  letter-spacing: -0.012em;
  color: var(--tx-white);
}

.page-about .about-hero__lead {
  max-width: 48ch;
  margin: 0 0 12px;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(247, 244, 236, 0.82);
}

.page-about .about-hero__lead--sub {
  margin-bottom: 0;
  color: var(--tx-neon);
  font-size: 15px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
}

.page-about .about-hero__figure .tx-sticker {
  position: absolute;
  top: 14px;
  right: -6px;
  z-index: 2;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 18px;
  margin: 44px 0 0;
  padding: 24px 0 0;
  list-style: none;
  border-top: 1px solid var(--tx-rule);
}

.page-about .about-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-hero__num {
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--tx-neon);
}

.page-about .about-hero__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--tx-gray);
}

/* ---------- 主体 · 印刷跨页 ---------- */
.page-about .about-body {
  position: relative;
  padding: 52px 0 68px;
  background: var(--tx-cream);
  color: var(--about-ink);
  border-top: 1px solid var(--tx-rule);
}

.page-about .about-body__grid {
  row-gap: 40px;
}

/* 左栏索引 */
.page-about .about-index {
  align-self: start;
  padding-bottom: 8px;
}

.page-about .about-index__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}

.page-about .about-index__list a {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 9px 0;
  font-size: 14px;
  color: var(--about-ink);
  text-decoration: none;
  border-bottom: 1px dashed var(--about-hairline);
  transition: color var(--tx-dur-hover) var(--tx-ease), padding-left var(--tx-dur-hover) var(--tx-ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--tx-red);
  padding-left: 6px;
}

.page-about .about-index__no {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--tx-orange);
}

.page-about .about-index__quick {
  margin-top: 22px;
  flex-wrap: wrap;
  gap: 10px;
}

/* 章节通用 */
.page-about .about-sec {
  margin-bottom: 66px;
}

.page-about .about-sec:last-of-type {
  margin-bottom: 0;
}

.page-about .about-sec__head {
  margin-bottom: 20px;
}

.page-about .tx-section-head__title {
  scroll-margin-top: 116px;
  font-size: clamp(26px, 4.4vw, 38px);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-sec__lede {
  max-width: 62ch;
  margin: 0 0 26px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-muted);
}

.page-about .about-sec__prose p {
  max-width: 66ch;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 22px;
  width: 1px;
  background: var(--about-hairline);
}

.page-about .about-era {
  position: relative;
  padding: 0 0 30px 30px;
}

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

.page-about .about-era::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--about-ink);
  border-radius: 50%;
  background: var(--tx-cream);
  transition: background var(--tx-dur-hover) var(--tx-ease), border-color var(--tx-dur-hover) var(--tx-ease), transform var(--tx-dur-hover) var(--tx-ease);
}

.page-about .about-era:hover::before,
.page-about .about-era:focus-within::before {
  background: var(--tx-neon);
  border-color: var(--tx-orange);
  transform: scale(1.18);
}

.page-about .about-era__year {
  display: block;
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--tx-red);
}

.page-about .about-era__title {
  margin: 5px 0 6px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--about-ink);
}

.page-about .about-era__text {
  max-width: 60ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-muted);
}

.page-about .about-era__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  opacity: 0.7;
  transition: opacity var(--tx-dur-in) var(--tx-ease);
}

.page-about .about-era:hover .about-era__tags,
.page-about .about-era:focus-within .about-era__tags {
  opacity: 1;
}

.page-about .about-era__tags .tx-tag {
  padding: 3px 9px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--about-ink);
  background: transparent;
  border: 1px solid var(--about-hairline);
}

/* ---------- 四道工序 ---------- */
.page-about .about-process {
  display: grid;
  gap: 26px;
}

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

.page-about .about-steps {
  display: grid;
  gap: 16px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-step {
  padding: 18px 18px 20px;
  background: var(--tx-paper);
  border: 1px solid var(--about-hairline);
  border-left: 3px solid var(--tx-orange);
}

.page-about .about-step__no {
  display: block;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--tx-orange);
}

.page-about .about-step__title {
  margin: 8px 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--about-ink);
}

.page-about .about-step__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--about-muted);
}

/* ---------- 四级结构 ---------- */
.page-about .about-levels {
  list-style: none;
  margin: 26px 0 34px;
  padding: 0;
  display: grid;
}

.page-about .about-level {
  padding: 16px 16px 18px;
  border-top: 1px solid var(--about-hairline);
  border-left: 2px solid var(--tx-red);
  background: rgba(230, 220, 198, 0.42);
}

.page-about .about-level:nth-child(2) {
  border-left-color: var(--tx-orange);
}

.page-about .about-level:nth-child(3) {
  border-left-color: var(--tx-neon);
}

.page-about .about-level:nth-child(4) {
  border-left-color: var(--tx-gray);
  border-bottom: 1px solid var(--about-hairline);
}

.page-about .about-level__name {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--about-ink);
}

.page-about .about-level__idx {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--tx-gray);
}

.page-about .about-level__desc {
  max-width: 62ch;
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--about-muted);
}

.page-about .about-spec {
  padding: 24px 20px 26px;
}

.page-about .about-spec__title {
  margin: 0 0 18px;
  font-size: 18px;
  font-weight: 700;
  color: var(--about-ink);
}

.page-about .about-spec__cols {
  display: grid;
  gap: 20px;
}

.page-about .about-spec__num {
  margin: 0;
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--tx-red);
}

.page-about .about-spec__label {
  margin: 8px 0 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--about-ink);
}

.page-about .about-spec__text {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--about-muted);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 24px;
  margin-bottom: 30px;
}

.page-about .about-team__text p {
  max-width: 64ch;
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-muted);
}

.page-about .about-team__text p:first-child {
  color: var(--about-ink);
}

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

.page-about .about-crew {
  display: grid;
  gap: 1px;
  list-style: none;
  margin: 0;
  padding: 0;
  background: var(--about-hairline);
  border: 1px solid var(--about-hairline);
}

.page-about .about-crew__item {
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 4px 14px;
  align-items: baseline;
  padding: 14px 16px;
  background: var(--tx-cream);
}

.page-about .about-crew__num {
  grid-row: span 2;
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--tx-orange);
}

.page-about .about-crew__role {
  font-size: 15px;
  font-weight: 700;
  color: var(--about-ink);
}

.page-about .about-crew__duty {
  font-size: 13px;
  line-height: 1.7;
  color: var(--about-muted);
}

/* ---------- 承诺与行动 ---------- */
.page-about .about-promise {
  display: grid;
  gap: 18px;
  list-style: none;
  margin: 0 0 34px;
  padding: 0;
}

.page-about .about-promise__item {
  padding-left: 16px;
  border-left: 3px solid rgba(200, 255, 61, 0.9);
}

.page-about .about-promise__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--about-ink);
}

.page-about .about-promise__text {
  max-width: 62ch;
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--about-muted);
}

.page-about .about-cta {
  display: grid;
  gap: 22px;
  padding: 28px 22px 30px;
  background: var(--tx-pitch);
  border: 1px solid var(--tx-rule);
}

.page-about .about-cta__title {
  margin: 10px 0 10px;
  font-family: var(--tx-font-display);
  font-size: clamp(22px, 3.2vw, 30px);
  font-weight: 700;
  line-height: 1.24;
  color: var(--tx-white);
}

.page-about .about-cta__text {
  max-width: 54ch;
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(247, 244, 236, 0.78);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

.page-about .about-contact {
  margin-top: 30px;
  padding-top: 22px;
  border-top: 1px solid var(--about-hairline);
}

.page-about .about-contact__list {
  display: grid;
  gap: 1px;
  list-style: none;
  margin: 14px 0 12px;
  padding: 0;
  background: var(--about-hairline);
  border: 1px solid var(--about-hairline);
}

.page-about .about-contact__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  padding: 12px 14px;
  background: var(--tx-cream);
}

.page-about .about-contact__label {
  min-width: 72px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--tx-gray);
}

.page-about .about-contact__value {
  font-family: var(--tx-font-mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--about-ink);
}

.page-about .about-contact__value--text {
  font-family: var(--tx-font-body);
  font-weight: 400;
}

.page-about .about-contact .tx-note a {
  color: var(--tx-red);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 34px 0 64px;
  }

  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
    margin-top: 52px;
    padding-top: 26px;
  }

  .page-about .about-hero__num {
    font-size: 36px;
  }

  .page-about .about-body {
    padding: 66px 0 84px;
  }

  .page-about .about-index {
    position: sticky;
    top: 112px;
  }

  .page-about .about-sec {
    margin-bottom: 78px;
  }

  .page-about .about-process {
    grid-template-columns: 5fr 7fr;
    gap: 32px;
    align-items: start;
  }

  .page-about .about-level {
    padding: 18px 20px 20px;
  }

  .page-about .about-level:nth-child(2) {
    margin-left: 5%;
  }

  .page-about .about-level:nth-child(3) {
    margin-left: 10%;
  }

  .page-about .about-level:nth-child(4) {
    margin-left: 15%;
  }

  .page-about .about-team {
    grid-template-columns: 6fr 6fr;
    gap: 34px;
    align-items: start;
  }

  .page-about .about-promise {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 30px;
  }

  .page-about .about-cta {
    grid-template-columns: 7fr 5fr;
    align-items: center;
    padding: 34px 32px 36px;
    gap: 30px;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1200px) {
  .page-about .about-sec__prose p {
    font-size: 16px;
  }

  .page-about .about-era__text,
  .page-about .about-step__text,
  .page-about .about-promise__text {
    font-size: 15px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-era::before,
  .page-about .about-era__tags,
  .page-about .about-index__list a {
    transition: none;
  }
}