.page-about {
  --about-axis: 96px;
  --about-cut: 12px;
  background: var(--paper);
  color: var(--ink);
  overflow-x: clip;
}

.page-about .section {
  padding-block: clamp(40px, 7vw, 84px);
}

.page-about h2 {
  font-size: clamp(22px, 3.6vw, 34px);
  font-weight: 900;
  letter-spacing: .02em;
  line-height: 1.25;
  margin: 10px 0 0;
  max-width: 24ch;
}

.page-about a {
  color: var(--blue);
}

.page-about a:hover {
  color: var(--copper);
}

.page-about .breadcrumb {
  padding-block: clamp(14px, 2vw, 22px) 0;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: clamp(18px, 3vw, 34px);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(26px, 5vw, 52px);
}

.page-about .about-hero h1 {
  font-size: clamp(29px, 6.2vw, 56px);
  font-weight: 900;
  letter-spacing: .02em;
  line-height: 1.12;
  margin: 12px 0 0;
  max-width: 19ch;
}

.page-about .about-hero__lead {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  font-size: clamp(15px, 1.7vw, 17.5px);
  line-height: 1.8;
  max-width: 48ch;
  color: var(--ink);
}

.page-about .about-hero .btn-row {
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-hero__figs {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-fig {
  background: var(--paper-white);
  padding: clamp(14px, 2.4vw, 22px);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-fig__num {
  font-size: clamp(26px, 3.8vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--blue);
  font-variant-numeric: tabular-nums;
}

.page-about .about-fig__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--graphite);
  letter-spacing: .04em;
}

/* ---------- 业务范围 ---------- */

.page-about .about-scope__grid {
  display: grid;
  gap: clamp(26px, 5vw, 56px);
}

.page-about .about-scope__text p {
  margin: clamp(14px, 2vw, 18px) 0 0;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.8;
  color: var(--graphite);
  max-width: 52ch;
}

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

.page-about .about-scope__def {
  padding-block: clamp(12px, 2vw, 16px);
  border-top: 1px solid var(--line);
}

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

/* ---------- 沿革长轴 ---------- */

.page-about .about-axis__head {
  display: grid;
  gap: clamp(14px, 3vw, 30px);
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-axis__lead {
  margin: clamp(12px, 2vw, 18px) 0 0;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.8;
  color: var(--graphite);
  max-width: 54ch;
}

.page-about .axis {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .axis__row {
  display: grid;
  grid-template-columns: minmax(62px, var(--about-axis)) minmax(0, 1fr);
  gap: clamp(14px, 3vw, 36px);
  border-top: 1px solid var(--line);
  transition: background-color .16s ease;
}

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

.page-about .axis__row:hover {
  background: rgba(29, 92, 140, .045);
}

.page-about .axis__year {
  position: relative;
  border-left: 2px solid var(--blue);
  padding: clamp(20px, 3vw, 30px) 0 clamp(20px, 3vw, 30px) 14px;
}

.page-about .axis__year::before {
  content: "";
  position: absolute;
  left: -6px;
  top: calc(clamp(20px, 3vw, 30px) + 4px);
  width: 10px;
  height: 10px;
  background: var(--copper);
  transform: rotate(45deg);
}

.page-about .axis__year-num {
  font-size: clamp(15px, 1.9vw, 19px);
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--blue);
  font-variant-numeric: tabular-nums;
}

.page-about .axis__body {
  padding: clamp(20px, 3vw, 30px) 0;
}

.page-about .axis__title {
  font-size: clamp(17px, 2.2vw, 22px);
  font-weight: 800;
  letter-spacing: .02em;
  line-height: 1.4;
  margin: 0 0 10px;
  color: var(--ink);
}

.page-about .axis__body p {
  margin: 0;
  font-size: clamp(14px, 1.6vw, 16.5px);
  line-height: 1.8;
  color: var(--graphite);
  max-width: 62ch;
}

.page-about .axis__cap {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  margin-top: 14px;
  padding: 6px 14px;
  background: var(--paper-white);
  border-left: 3px solid var(--copper);
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--graphite);
}

.page-about .axis__cap .mono {
  font-size: 17px;
  font-weight: 700;
  color: var(--copper);
  font-variant-numeric: tabular-nums;
}

.page-about .about-axis__figure {
  margin: clamp(28px, 5vw, 48px) 0 0;
}

/* ---------- 整宽产线图 ---------- */

.page-about .about-belt {
  padding-bottom: clamp(32px, 6vw, 64px);
}

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

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

/* ---------- 斜线分隔带 ---------- */

.page-about .about-divider {
  height: clamp(26px, 4vw, 48px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background-image: repeating-linear-gradient(
    -45deg,
    rgba(193, 102, 47, .3) 0 2px,
    transparent 2px 14px
  );
}

/* ---------- 产能与仓储 ---------- */

.page-about .about-capacity__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  margin-top: clamp(24px, 4vw, 40px);
}

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

.page-about .about-capacity__panel {
  color: var(--on-navy);
  padding: clamp(22px, 3.4vw, 32px);
}

.page-about .about-capacity__kicker {
  margin: 0;
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--copper-light);
}

.page-about .about-capacity__big {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(46px, 9vw, 76px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--paper-white);
  font-variant-numeric: tabular-nums;
}

.page-about .about-capacity__big span {
  font-family: var(--font-sans);
  font-size: .3em;
  font-weight: 600;
  letter-spacing: .08em;
  margin-left: 8px;
  color: var(--copper-light);
}

.page-about .about-capacity__sub {
  margin: 10px 0 0;
  font-size: 13px;
  letter-spacing: .04em;
  color: rgba(201, 214, 225, .8);
}

.page-about .about-capacity__dl {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
}

.page-about .about-capacity__dl > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 0;
  border-top: 1px solid rgba(201, 214, 225, .24);
}

.page-about .about-capacity__dl dt {
  font-size: 13px;
  letter-spacing: .06em;
  color: rgba(201, 214, 225, .85);
}

.page-about .about-capacity__dl dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--copper-light);
  font-variant-numeric: tabular-nums;
}

/* ---------- 覆盖与协作 ---------- */

.page-about .about-reach__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-reach__lead p {
  margin: clamp(14px, 2vw, 18px) 0 0;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.8;
  color: var(--graphite);
  max-width: 52ch;
}

.page-about .about-reach__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-reach__stat {
  background: var(--paper-white);
  border-top: 3px solid var(--green);
  padding: clamp(16px, 2.4vw, 24px);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-reach__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.2vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}

.page-about .about-reach__label {
  font-size: 13px;
  line-height: 1.55;
  color: var(--graphite);
}

/* ---------- 质量与复核 ---------- */

.page-about .about-qual__lead {
  margin: clamp(14px, 2vw, 18px) 0 0;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.8;
  color: var(--graphite);
  max-width: 56ch;
}

.page-about .about-qual__grid {
  margin-top: clamp(24px, 4vw, 40px);
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .qual-card {
  background: var(--paper-white);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}

.page-about .qual-card__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: clamp(16px, 2.4vw, 20px);
  cursor: pointer;
  list-style: none;
  border-left: 4px solid var(--blue);
}

.page-about .qual-card__head::-webkit-details-marker {
  display: none;
}

.page-about .qual-card__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--copper);
}

.page-about .qual-card[open] .qual-card__head::after {
  content: "–";
}

.page-about .qual-card__head:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .qual-card__code {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--copper);
}

.page-about .qual-card__title {
  font-size: clamp(15px, 1.9vw, 18px);
  font-weight: 800;
  letter-spacing: .02em;
  color: var(--ink);
}

.page-about .qual-card__body {
  padding: 0 clamp(16px, 2.4vw, 20px) clamp(16px, 2.4vw, 20px)
    calc(clamp(16px, 2.4vw, 20px) + 4px);
}

.page-about .qual-card__body p {
  margin: 0;
  font-size: clamp(14px, 1.6vw, 16px);
  line-height: 1.8;
  color: var(--graphite);
  max-width: 62ch;
}

.page-about .qual-card:hover {
  background: var(--paper);
}

/* ---------- 承接方式 ---------- */

.page-about .about-intake__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-intake__body > p {
  margin: clamp(14px, 2vw, 18px) 0 0;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.8;
  color: var(--graphite);
  max-width: 56ch;
}

.page-about .about-intake__steps {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .step-list__item {
  background: var(--paper-white);
  padding: clamp(16px, 2.6vw, 22px);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 16px;
  align-items: baseline;
}

.page-about .step-list__num {
  grid-row: span 2;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--copper);
  font-variant-numeric: tabular-nums;
}

.page-about .step-list__title {
  font-size: clamp(15px, 1.9vw, 17px);
  font-weight: 800;
  letter-spacing: .02em;
  margin: 0;
  color: var(--ink);
}

.page-about .step-list__item p {
  margin: 0;
  font-size: clamp(13.5px, 1.6vw, 15.5px);
  line-height: 1.75;
  color: var(--graphite);
  max-width: 56ch;
}

.page-about .about-intake__aside {
  align-self: start;
  padding: clamp(20px, 3vw, 28px);
  background: var(--paper-white);
  border-left: 4px solid var(--copper);
}

.page-about .about-intake__aside-kicker {
  margin: 0;
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--copper);
}

.page-about .about-intake__links {
  list-style: none;
  margin: clamp(14px, 2vw, 18px) 0 0;
  padding: 0;
}

.page-about .about-intake__links li + li {
  border-top: 1px solid var(--line);
}

.page-about .about-intake__links a {
  display: block;
  padding: 12px 0;
  font-size: 14.5px;
  line-height: 1.6;
  text-decoration: none;
  color: var(--blue);
}

.page-about .about-intake__links a:hover {
  color: var(--copper);
}

.page-about .about-intake__links a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 收束 ---------- */

.page-about .about-cta {
  background: var(--archive-navy);
  color: var(--on-navy);
}

.page-about .about-cta__inner {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
}

.page-about .about-cta h2 {
  color: var(--paper-white);
  margin: 0;
  max-width: 26ch;
}

.page-about .about-cta p {
  margin: 0;
  font-size: clamp(14.5px, 1.6vw, 16.5px);
  line-height: 1.8;
  color: rgba(201, 214, 225, .9);
  max-width: 58ch;
}

.page-about .about-cta .btn--ghost {
  color: var(--paper-white);
  border-color: rgba(201, 214, 225, .5);
}

.page-about .about-cta .btn--ghost:hover {
  color: var(--paper-white);
  border-color: var(--copper-light);
}

/* ---------- 响应式 ---------- */

@media (min-width: 860px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

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

  .page-about .about-axis__head {
    grid-template-columns: auto minmax(0, 1fr);
    gap: clamp(24px, 4vw, 48px);
    align-items: start;
  }

  .page-about .about-capacity__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: stretch;
  }

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

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

  .page-about .about-intake__grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about {
    --about-axis: 118px;
  }

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

@media (max-width: 560px) {
  .page-about .about-hero__figs,
  .page-about .about-reach__stats {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .axis__row {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }

  .page-about .axis__year {
    padding-bottom: 0;
    border-left-width: 2px;
  }

  .page-about .axis__year::before {
    top: calc(clamp(20px, 3vw, 30px) + 3px);
  }

  .page-about .step-list__item {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .step-list__num {
    grid-row: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .axis__row,
  .page-about .qual-card {
    transition: none;
  }
}