.page-about {
  --about-axis-w: 128px;
  --about-gap: 40px;
  --about-radius: 2px;
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  background: var(--paper-2);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-crumb .breadcrumb {
  padding-block: 14px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(44px, 7vw, 96px) clamp(52px, 8vw, 108px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: var(--line-dark);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(32px, 5vw, 68px);
  align-items: start;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.1rem, 5.4vw, 3.9rem);
  line-height: 1.16;
  letter-spacing: 0.015em;
  color: var(--paper);
  margin: 18px 0 0;
  max-width: 15ch;
}

.page-about .about-hero__lede {
  margin-top: 24px;
  max-width: 46ch;
  font-size: clamp(0.96rem, 1.4vw, 1.06rem);
  line-height: 1.9;
  color: rgba(244, 239, 228, 0.82);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 22px 28px;
  margin: 38px 0 0;
  padding-top: 26px;
  border-top: 1px solid var(--line-dark);
}

.page-about .about-stat__label {
  font-family: var(--font-cond);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gravel);
  margin: 0;
}

.page-about .about-stat__num {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 4.4vw, 2.9rem);
  font-weight: 500;
  line-height: 1;
  color: var(--sand);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__unit {
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--sand-light);
  margin-left: 6px;
}

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

/* ---------- 年份轴 ---------- */
.page-about .about-scale {
  padding-block: clamp(48px, 7vw, 96px);
}

.page-about .about-axis {
  list-style: none;
  margin: clamp(32px, 5vw, 58px) 0 0;
  padding: 0;
}

.page-about .about-axis__item {
  position: relative;
  padding-block: clamp(24px, 3.4vw, 38px);
  border-top: 1px solid var(--line-dark-soft);
}

.page-about .about-axis__item:last-child {
  border-bottom: 1px solid var(--line-dark-soft);
}

.page-about .about-axis__scale {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 12px;
}

.page-about .about-axis__year {
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  font-weight: 500;
  color: var(--sand);
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}

.page-about .about-axis__count {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  color: rgba(244, 239, 228, 0.66);
  letter-spacing: 0.06em;
}

.page-about .about-axis__title {
  font-family: var(--font-display);
  font-size: clamp(1.08rem, 2vw, 1.34rem);
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
  margin: 0;
}

.page-about .about-axis__desc {
  margin: 12px 0 0;
  max-width: 58ch;
  font-size: 0.96rem;
  line-height: 1.85;
  color: rgba(244, 239, 228, 0.74);
}

.page-about .about-axis__tag {
  margin: 16px 0 0;
}

/* ---------- 三条业务线 ---------- */
.page-about .about-lines {
  padding-block: clamp(48px, 7vw, 96px);
}

.page-about .about-lines__figure {
  margin: clamp(28px, 4vw, 48px) 0 clamp(28px, 4vw, 46px);
}

.page-about .about-tracks {
  display: block;
  width: 100%;
  height: auto;
  margin-bottom: clamp(28px, 4vw, 46px);
}

.page-about .about-tracks__rails line {
  stroke: var(--line-dark);
  stroke-width: 1;
  stroke-dasharray: 1 7;
}

.page-about .about-tracks__links line {
  stroke: var(--jade-bright);
  stroke-width: 1;
}

.page-about .about-tracks__nodes circle {
  fill: var(--sand);
}

.page-about .about-lines__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-dark-soft);
  border: 1px solid var(--line-dark-soft);
}

.page-about .about-line {
  background: var(--jade);
  padding: clamp(24px, 3.4vw, 38px);
  transition: background-color 240ms var(--ease);
}

.page-about .about-line:hover,
.page-about .about-line:focus-within {
  background: var(--jade-mid);
}

.page-about .about-line__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--sand);
}

.page-about .about-line__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.16rem, 2.2vw, 1.42rem);
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-line__share {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--sand-light);
}

.page-about .about-line__desc {
  margin: 16px 0 0;
  font-size: 0.94rem;
  line-height: 1.85;
  color: rgba(244, 239, 228, 0.76);
}

/* ---------- 专利年表 ---------- */
.page-about .about-patents {
  position: relative;
  overflow: hidden;
  padding-block: clamp(48px, 7vw, 96px);
}

.page-about .about-patents__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.09;
  pointer-events: none;
}

.page-about .about-patents__inner {
  position: relative;
}

.page-about .about-patent-years {
  list-style: none;
  margin: clamp(32px, 5vw, 56px) 0 0;
  padding: 0;
}

.page-about .about-patent-year {
  border-top: 1px solid var(--line-dark-soft);
  padding-block: clamp(22px, 3vw, 34px);
}

.page-about .about-patent-year:last-child {
  border-bottom: 1px solid var(--line-dark-soft);
}

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

.page-about .about-patent-year__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 500;
  line-height: 1;
  color: var(--sand);
  font-variant-numeric: tabular-nums;
}

.page-about .about-patent-year__count {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--gravel);
}

.page-about .about-patent-year__items {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-dark-soft);
}

.page-about .about-patent {
  position: relative;
  background: var(--jade-deep);
  padding: 18px 20px 18px 24px;
  transition: background-color 220ms var(--ease);
}

.page-about .about-patent::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: transparent;
  transition: background-color 220ms var(--ease);
}

.page-about .about-patent:hover,
.page-about .about-patent:focus-within {
  background: var(--jade-mid);
}

.page-about .about-patent:hover::before,
.page-about .about-patent:focus-within::before {
  background: var(--sand);
}

.page-about .about-patent--um::before {
  background: rgba(178, 58, 46, 0.35);
}

.page-about .about-patent__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--gravel);
}

.page-about .about-patent__name {
  margin: 8px 0 0;
  font-family: var(--font-body);
  font-size: 0.98rem;
  font-weight: 500;
  line-height: 1.6;
  color: var(--paper);
}

.page-about .about-patent__use {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--sand-light);
}

.page-about .about-patents__foot {
  margin: clamp(26px, 4vw, 40px) 0 0;
  font-size: 0.92rem;
  line-height: 1.85;
  color: rgba(244, 239, 228, 0.7);
}

/* ---------- 我们如何做事 ---------- */
.page-about .about-method {
  padding-block: clamp(52px, 8vw, 104px);
}

.page-about .about-method__list {
  list-style: none;
  margin: clamp(34px, 5vw, 60px) 0 0;
  padding: 0;
  counter-reset: method;
}

.page-about .about-method__item {
  padding-block: clamp(26px, 4vw, 42px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-method__item:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-method__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--jade-mid);
}

.page-about .about-method__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.12rem, 2.1vw, 1.38rem);
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .about-method__desc {
  margin: 12px 0 0;
  font-size: 0.96rem;
  line-height: 1.88;
  color: rgba(21, 22, 20, 0.78);
}

/* ---------- 合作与试点 ---------- */
.page-about .about-partner {
  padding-block: clamp(48px, 7vw, 96px);
}

.page-about .about-partner__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 4.4vw, 60px);
}

.page-about .about-partner__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 600;
  line-height: 1.34;
  color: var(--ink);
  max-width: 22ch;
}

.page-about .about-partner__desc {
  margin: 18px 0 0;
  max-width: 54ch;
  font-size: 0.96rem;
  line-height: 1.88;
  color: rgba(21, 22, 20, 0.78);
}

.page-about .about-partner__link {
  margin: 22px 0 0;
}

.page-about .about-partner__aside {
  background: var(--paper);
  border-top: 3px solid var(--sand);
  border-right: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  border-left: 1px solid var(--line-soft);
  padding: clamp(22px, 3vw, 34px);
}

.page-about .about-partner__aside-title {
  margin: 0;
  font-family: var(--font-cond);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--jade);
}

.page-about .about-partner__list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
}

.page-about .about-partner__list li {
  position: relative;
  padding: 12px 0 12px 22px;
  font-size: 0.94rem;
  line-height: 1.78;
  color: rgba(21, 22, 20, 0.8);
  border-top: 1px solid var(--line-soft);
}

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

.page-about .about-partner__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  width: 8px;
  height: 2px;
  background: var(--sand);
}

.page-about .about-partner__list li:first-child::before {
  top: 12px;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding-block: clamp(48px, 7vw, 92px);
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
  align-items: end;
}

.page-about .about-next__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.2vw, 2.2rem);
  font-weight: 600;
  line-height: 1.34;
  color: var(--paper);
  max-width: 24ch;
}

.page-about .about-next__desc {
  margin: 18px 0 0;
  max-width: 52ch;
  font-size: 0.96rem;
  line-height: 1.86;
  color: rgba(244, 239, 228, 0.74);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 焦点反馈 ---------- */
.page-about a:focus-visible,
.page-about .about-patent:focus-within {
  outline: 2px solid var(--jade-bright);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-patent-year__items {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-partner__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.95fr);
    gap: clamp(40px, 6vw, 88px);
  }

  .page-about .about-hero__figure {
    margin-top: 12px;
  }

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

  .page-about .about-next__grid {
    grid-template-columns: minmax(0, 1.5fr) auto;
  }

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

@media (min-width: 1000px) {
  .page-about .about-axis__item {
    display: grid;
    grid-template-columns: var(--about-axis-w) minmax(0, 1fr);
    gap: 0 var(--about-gap);
  }

  .page-about .about-axis__scale {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 0;
    padding-right: 22px;
    border-right: 1px solid var(--line-dark);
  }

  .page-about .about-axis__body {
    position: relative;
    padding-left: 4px;
  }

  .page-about .about-axis__body::before {
    content: "";
    position: absolute;
    left: calc(-1 * var(--about-gap) - 5px);
    top: 10px;
    width: 9px;
    height: 9px;
    border: 2px solid var(--sand);
    background: var(--jade);
    border-radius: 50%;
    transition: background-color 220ms var(--ease);
  }

  .page-about .about-axis__item:hover .about-axis__body::before {
    background: var(--sand);
  }

  .page-about .about-patent-year {
    display: grid;
    grid-template-columns: 164px minmax(0, 1fr);
    gap: 0 var(--about-gap);
  }

  .page-about .about-patent-year__label {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 0;
    padding-right: 22px;
    border-right: 1px solid var(--line-dark);
  }

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

@media (min-width: 1240px) {
  .page-about .about-patent-year__items {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-hero__title {
    max-width: 13ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
  }
}