/* ==========================================================================
   大发 CN 中文官网 · 品牌自述 /about-us/
   作用域：.page-about
   ========================================================================== */

.page-about {
  --about-rail: 62px;
  --about-measure: 680px;
  background: var(--c-paper);
  color: var(--c-ink);
  overflow-x: clip;
}

.page-about .wrap {
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: clamp(18px, 4.5vw, 52px);
}

@media (min-width: 900px) {
  .page-about { --about-rail: 132px; }
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}
.page-about .about-crumb li + li::before {
  content: "/";
  margin-right: 10px;
  color: var(--c-stone);
}
.page-about .about-crumb a {
  color: var(--c-lake-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--c-signal);
  border-bottom-color: var(--c-signal);
}
.page-about .about-crumb [aria-current="page"] { color: var(--c-mustard); }

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--c-ink);
  color: var(--c-paper);
  border-bottom: 1px solid var(--line-dark);
  padding-block: clamp(30px, 5vw, 60px) clamp(38px, 6vw, 72px);
  overflow: hidden;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--line-dark-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-dark-soft) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.7;
}
.page-about .about-hero > .wrap {
  position: relative;
  z-index: 1;
}

.page-about .hero-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  margin-top: clamp(24px, 4vw, 46px);
}

.page-about .hero-kicker {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-lake-soft);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(40px, 8vw, 84px);
  line-height: 0.98;
  letter-spacing: -0.025em;
  color: var(--c-paper);
}
.page-about .about-hero h1 .hl { color: var(--c-mustard); }

.page-about .hero-lead {
  max-width: 620px;
  margin: 22px 0 0;
  font-size: clamp(16px, 2.2vw, 18px);
  line-height: 1.78;
  color: var(--c-lake-soft);
}

.page-about .hero-facts {
  margin: 0;
  border-top: 1px solid var(--line-dark);
}
.page-about .hero-facts .fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line-dark-soft);
}
.page-about .hero-facts dt {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--c-stone);
}
.page-about .hero-facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-mustard);
}

@media (min-width: 900px) {
  .page-about .hero-split {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 56px;
    align-items: end;
  }
}

/* ---------- 长卷主体 ---------- */
.page-about .about-roll {
  padding-bottom: clamp(48px, 8vw, 104px);
}

.page-about .roll-sec {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding-block: clamp(32px, 5vw, 62px);
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: calc(var(--header-h) + 24px);
}
.page-about .roll-sec:first-child { border-top: none; }

.page-about .sec-rail { padding-top: 2px; }
.page-about .sec-code {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-lake);
  border-bottom: 1px solid var(--wash-strong);
  padding-bottom: 3px;
}

.page-about .sec-body { min-width: 0; }

.page-about .roll-sec h2 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 4.4vw, 46px);
  line-height: 1.06;
  letter-spacing: -0.018em;
  color: var(--c-ink);
}

@media (min-width: 900px) {
  .page-about .roll-sec {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 38px;
  }
}

/* ---------- 正文 ---------- */
.page-about .prose {
  max-width: var(--about-measure);
  font-size: 17px;
  line-height: 1.78;
  color: var(--c-ink);
}
.page-about .prose p { margin: 0 0 16px; }
.page-about .prose p:last-child { margin-bottom: 0; }
.page-about .prose a {
  color: var(--c-link);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--dur) var(--ease);
}
.page-about .prose a:hover,
.page-about .prose a:focus-visible { color: var(--c-signal); }

.page-about .sec-lead {
  max-width: var(--about-measure);
  margin: 0 0 26px;
  font-size: 17.5px;
  line-height: 1.76;
  color: var(--c-moss);
}

/* ---------- 图形 ---------- */
.page-about .about-figure {
  position: relative;
  margin: 0 0 28px;
  border: 1px solid var(--line-soft);
  background: var(--c-paper);
}
.page-about .about-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--wash) 1px, transparent 1px),
    linear-gradient(to bottom, var(--wash) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.75;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}
.page-about .about-figure figcaption {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line-soft);
  padding: 9px 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--c-stone);
  background: var(--c-paper);
}

/* ---------- 四维度 ---------- */
.page-about .dim-index {
  display: flex;
  flex-wrap: wrap;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.page-about .dim-jump {
  flex: 1 1 142px;
  padding: 13px 14px;
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--c-lake);
  text-decoration: none;
  border-right: 1px solid var(--line-soft);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.page-about .dim-jump:last-child { border-right: none; }
.page-about .dim-jump:hover,
.page-about .dim-jump:focus-visible {
  color: var(--c-signal);
  background: var(--wash);
}

.page-about .dim-list {
  margin-top: 24px;
  border-top: 1px solid var(--line-soft);
}
.page-about .dim {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding: 24px 0 24px 16px;
  border-bottom: 1px solid var(--line-soft);
  scroll-margin-top: calc(var(--header-h) + 28px);
}
.page-about .dim::before {
  content: "";
  position: absolute;
  left: 0;
  top: 26px;
  bottom: 26px;
  width: 2px;
  opacity: 0.4;
  background: var(--c-lake);
  transition: opacity var(--dur) var(--ease);
}
.page-about .dim:nth-child(1)::before { background: var(--c-lake); }
.page-about .dim:nth-child(2)::before { background: var(--c-moss); }
.page-about .dim:nth-child(3)::before { background: var(--c-clay); }
.page-about .dim:nth-child(4)::before { background: var(--c-lake-soft); }
.page-about .dim:hover::before { opacity: 1; }

.page-about .dim-head {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.page-about .dim-num {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-lake);
}
.page-about .dim-head h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 26px;
  line-height: 1.12;
  letter-spacing: -0.01em;
}
.page-about .dim-label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.03em;
  color: var(--c-stone);
}
.page-about .dim-text {
  margin: 0;
  max-width: 620px;
  font-size: 16.5px;
  line-height: 1.76;
}

@media (min-width: 780px) {
  .page-about .dim {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 32px;
    padding-block: 28px;
  }
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .tl-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding-block: 22px;
}
.page-about .tl-item + .tl-item { border-top: 1px dashed var(--line-soft); }

.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 5.4vw, 46px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.035em;
  color: var(--c-stone);
  transition: color var(--dur-slow) var(--ease);
}
.page-about .tl-item.is-in .tl-year { color: var(--c-mustard); }

.page-about .tl-body {
  position: relative;
  padding-left: 24px;
  border-left: 1px solid var(--line-soft);
  transition: border-color var(--dur-slow) var(--ease);
}
.page-about .tl-body::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 7px;
  width: 8px;
  height: 8px;
  background: var(--c-stone);
  transition: background var(--dur-slow) var(--ease);
}
.page-about .tl-item.is-in .tl-body { border-left-color: var(--line-strong); }
.page-about .tl-item.is-in .tl-body::before { background: var(--c-signal); }

.page-about .tl-body h3 {
  margin: 0 0 8px;
  font-family: var(--font-body);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
}
.page-about .tl-body p {
  margin: 0;
  max-width: 620px;
  font-size: 15.5px;
  line-height: 1.74;
}

@media (min-width: 780px) {
  .page-about .tl-item {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 30px;
    padding-block: 26px;
    align-items: start;
  }
  .page-about .tl-year { text-align: right; }
}

/* ---------- 编号示意 SVG ---------- */
.page-about .spec-svg {
  display: block;
  width: 100%;
  max-width: 660px;
  height: auto;
  margin: 24px 0 26px;
  overflow: visible;
}
.page-about .spec-row rect {
  fill: none;
  stroke: var(--line-soft);
  stroke-width: 1;
}
.page-about .spec-row:first-child rect { stroke: var(--wash-strong); }
.page-about .spec-code {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  fill: var(--c-mustard);
}
.page-about .spec-label {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  fill: var(--c-ink);
}
.page-about .spec-desc {
  font-family: var(--font-body);
  font-size: 12.5px;
  fill: var(--c-stone);
}

/* ---------- 折叠问答 ---------- */
.page-about .qa-wrap {
  max-width: var(--about-measure);
  margin-top: 26px;
  border-top: 1px solid var(--line-soft);
}
.page-about .qa + .qa { border-top: 1px solid var(--line-soft); }

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: 24px 0 28px;
}
.page-about .team-item {
  padding: 20px 0;
  border-top: 1px solid var(--line-soft);
}
.page-about .team-code {
  display: block;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--c-lake);
}
.page-about .team-item h3 {
  margin: 9px 0 8px;
  font-size: 17px;
  font-weight: 600;
}
.page-about .team-item p {
  margin: 0;
  max-width: 340px;
  font-size: 15px;
  line-height: 1.74;
  color: var(--c-ink);
}

@media (min-width: 640px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
  }
}
@media (min-width: 1024px) {
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    column-gap: 28px;
  }
  .page-about .team-item p { max-width: none; }
}

.page-about .prose-contact {
  border-left: 2px solid var(--c-moss);
  padding-left: 18px;
}

/* ---------- 延伸入口 ---------- */
.page-about .next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}
.page-about .next-list li { border-bottom: 1px solid var(--line-soft); }
.page-about .next-list a {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 6px 16px;
  padding: 18px 2px 18px 0;
  text-decoration: none;
  color: var(--c-ink);
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}
.page-about .next-list a:hover,
.page-about .next-list a:focus-visible {
  color: var(--c-signal);
  padding-left: 12px;
}
.page-about .next-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 22px;
  letter-spacing: -0.01em;
}
.page-about .next-arrow {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--c-lake);
}
.page-about .next-list a:hover .next-arrow { color: var(--c-signal); }
.page-about .next-desc {
  grid-column: 1 / -1;
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-moss);
}

/* ---------- 窄屏收口 ---------- */
@media (max-width: 599px) {
  .page-about .hero-facts dd { font-size: 19px; }
  .page-about .dim-jump { flex-basis: 50%; }
  .page-about .dim-jump:nth-child(2n) { border-right: none; }
  .page-about .spec-label { font-size: 13px; }
  .page-about .spec-desc { font-size: 11.5px; }
}
<<<END>>>