.page-about {
  --about-rule: rgba(169, 118, 47, .45);
  --about-rule-soft: rgba(198, 189, 171, .9);
  --about-veil: rgba(217, 168, 94, .26);
  --about-ink-soft: rgba(246, 242, 233, .78);
  background: var(--db-paper);
  color: var(--db-body-text);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--db-ink);
  color: var(--db-cream);
  padding-top: 30px;
  overflow: hidden;
}
.page-about .about-hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(217, 168, 94, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(217, 168, 94, .07) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
}
.page-about .about-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  padding-bottom: 30px;
}
.page-about .about-hero__text { min-width: 0; }
.page-about .about-hero .db-breadcrumb { margin-bottom: 18px; }
.page-about .about-hero .db-breadcrumb__link { color: rgba(246, 242, 233, .7); }
.page-about .about-hero .db-breadcrumb__link[aria-current="page"] { color: var(--db-copper-bright); }
.page-about .about-hero__kicker { color: var(--db-copper-bright); }
.page-about .about-hero h1 {
  font-family: var(--db-serif);
  font-weight: 600;
  font-size: 28px;
  line-height: 1.3;
  letter-spacing: .02em;
  margin: 10px 0 0;
  color: var(--db-cream);
  max-width: 20em;
}
.page-about .about-hero__lead {
  margin: 16px 0 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-ink-soft);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}
.page-about .about-hero .db-btn--ghost {
  color: var(--db-copper-bright);
  border-color: rgba(217, 168, 94, .5);
  background: transparent;
}
.page-about .about-hero__figure { margin: 0; min-width: 0; }
.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border: 1px solid rgba(217, 168, 94, .35);
  filter: saturate(.72) contrast(1.03) brightness(.92);
}

.page-about .about-hero__stats {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--about-veil);
  border-top: 1px solid var(--about-veil);
}
.page-about .about-hero__stat {
  background: var(--db-ink);
  padding: 16px 14px 18px;
}
.page-about .about-hero__stat b {
  display: block;
  font-family: var(--db-mono);
  font-weight: 500;
  font-size: 26px;
  line-height: 1.1;
  color: var(--db-copper-bright);
}
.page-about .about-hero__stat span {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.5;
  color: rgba(246, 242, 233, .62);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding-top: 28px;
  padding-bottom: 56px;
}
.page-about .about-index {
  border-top: 1px solid var(--about-rule);
  padding-top: 12px;
  margin-bottom: 12px;
}
.page-about .about-index__title {
  margin: 0 0 10px;
  font-family: var(--db-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--db-rock);
}
.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.page-about .about-index__item { flex: none; }
.page-about .about-index__link {
  display: block;
  padding: 6px 10px;
  font-size: 13px;
  line-height: 1.4;
  white-space: nowrap;
  text-decoration: none;
  color: var(--db-rock);
  border: 1px solid var(--about-rule-soft);
  background: var(--db-cream);
}
.page-about .about-index__link[aria-current="true"] {
  color: var(--db-copper-deep);
  border-color: var(--db-copper);
  background: rgba(169, 118, 47, .08);
}
.page-about .about-index__foot {
  display: none;
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--db-rock);
}
.page-about .about-index__foot a { color: var(--db-copper-deep); }

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: 30px 0 8px;
  border-top: 1px solid var(--about-rule-soft);
}
.page-about .about-section:first-child { border-top: 0; padding-top: 8px; }
.page-about .about-section__head { margin-bottom: 22px; }
.page-about .about-section__title {
  font-family: var(--db-serif);
  font-weight: 600;
  font-size: 22px;
  line-height: 1.35;
  letter-spacing: .02em;
  color: var(--db-ink);
  margin: 8px 0 0;
}
.page-about .about-section__title::after {
  content: "";
  display: block;
  width: 46px;
  height: 1px;
  margin-top: 12px;
  background: var(--db-copper);
}
.page-about .about-section__lede {
  margin: 14px 0 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--db-body-text);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 0 0 26px 20px;
  border-left: 1px solid var(--about-rule);
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 8px;
  width: 7px;
  height: 7px;
  background: var(--db-copper);
}
.page-about .about-timeline__year {
  margin: 0;
  font-family: var(--db-mono);
  font-size: 22px;
  font-weight: 500;
  letter-spacing: .02em;
  line-height: 1;
  color: var(--db-copper-deep);
}
.page-about .about-timeline__panel { min-width: 0; }
.page-about .about-timeline__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
  font: inherit;
  text-align: left;
  color: inherit;
  cursor: pointer;
}
.page-about .about-timeline__label {
  font-family: var(--db-serif);
  font-weight: 600;
  font-size: 18px;
  line-height: 1.4;
  color: var(--db-ink);
}
.page-about .about-timeline__sign {
  position: relative;
  flex: none;
  width: 12px;
  height: 12px;
}
.page-about .about-timeline__sign::before,
.page-about .about-timeline__sign::after {
  content: "";
  position: absolute;
  background: var(--db-copper);
}
.page-about .about-timeline__sign::before { left: 0; top: 5.5px; width: 12px; height: 1px; }
.page-about .about-timeline__sign::after {
  left: 5.5px;
  top: 0;
  width: 1px;
  height: 12px;
  transition: transform .2s ease;
}
.page-about .about-timeline__toggle[aria-expanded="false"] .about-timeline__sign::after { transform: scaleY(0); }

.page-about .about-timeline__body { padding-top: 10px; }
.page-about [data-tree-toggle][aria-expanded="false"] + [data-tree-panel] { display: none; }
.page-about .about-timeline__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  max-width: 44em;
}
.page-about .about-timeline__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}
.page-about .about-timeline__list li {
  position: relative;
  padding: 4px 0 4px 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--db-rock);
}
.page-about .about-timeline__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 13px;
  width: 10px;
  height: 1px;
  background: var(--db-copper);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-rule-soft);
  border: 1px solid var(--about-rule-soft);
}
.page-about .about-team__item {
  background: var(--db-cream);
  padding: 20px 18px 22px;
}
.page-about .about-team__code {
  display: block;
  font-family: var(--db-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--db-copper);
}
.page-about .about-team__name {
  margin: 10px 0 0;
  font-family: var(--db-serif);
  font-weight: 600;
  font-size: 17px;
  line-height: 1.4;
  color: var(--db-ink);
}
.page-about .about-team__desc {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--db-body-text);
}
.page-about .about-team__facts {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--about-rule-soft);
  border-top: 1px solid var(--db-copper);
  border-bottom: 1px solid var(--about-rule-soft);
}
.page-about .about-team__fact {
  background: var(--db-paper);
  padding: 14px 12px 16px;
}
.page-about .about-team__fact b {
  display: block;
  font-family: var(--db-mono);
  font-weight: 500;
  font-size: 20px;
  line-height: 1.15;
  color: var(--db-copper-deep);
}
.page-about .about-team__fact span {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--db-rock);
}

/* ---------- 资质 ---------- */
.page-about .about-security {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}
.page-about .about-security__figure { margin: 0; }
.page-about .about-security__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--about-rule-soft);
  filter: saturate(.7) contrast(1.02);
}
.page-about .about-security__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--db-rock);
}
.page-about .about-security__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-security__item {
  padding: 16px 0 18px;
  border-top: 1px solid var(--about-rule-soft);
}
.page-about .about-security__item:first-child { border-top: 0; padding-top: 0; }
.page-about .about-security__name {
  margin: 0;
  font-family: var(--db-serif);
  font-weight: 600;
  font-size: 16px;
  line-height: 1.4;
  color: var(--db-ink);
}
.page-about .about-security__name::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 10px;
  background: var(--db-celadon);
  vertical-align: middle;
}
.page-about .about-security__item p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--db-body-text);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
.page-about .about-partners__numbers {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--about-rule-soft);
  border: 1px solid var(--about-rule-soft);
}
.page-about .about-partners__stat {
  background: var(--db-brown);
  padding: 20px 14px 22px;
}
.page-about .about-partners__stat .db-stat__value {
  display: block;
  font-family: var(--db-mono);
  font-weight: 500;
  font-size: 40px;
  line-height: 1;
  color: var(--db-copper-bright);
}
.page-about .about-partners__stat .db-stat__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(246, 242, 233, .7);
}
.page-about .about-partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-partners__item {
  padding: 14px 0 16px;
  border-top: 1px solid var(--about-rule-soft);
}
.page-about .about-partners__item:first-child { border-top: 0; padding-top: 0; }
.page-about .about-partners__name {
  margin: 0;
  font-family: var(--db-serif);
  font-weight: 600;
  font-size: 16px;
  line-height: 1.45;
  color: var(--db-ink);
}
.page-about .about-partners__item p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--db-body-text);
}
.page-about .about-partners__note {
  margin: 22px 0 0;
  padding: 14px 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--db-ink);
  background: rgba(91, 122, 107, .12);
  border-left: 2px solid var(--db-celadon);
}

/* ---------- 覆盖与地区 ---------- */
.page-about .about-coverage__figure { margin: 0 0 22px; }
.page-about .about-coverage__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--about-rule-soft);
  filter: saturate(.7) contrast(1.02);
}
.page-about .about-coverage__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--db-rock);
}
.page-about .about-regions {
  border-top: 1px solid var(--db-copper);
}
.page-about .about-region {
  border-bottom: 1px solid var(--about-rule-soft);
  background: var(--db-cream);
}
.page-about .about-region__summary {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}
.page-about .about-region__summary::-webkit-details-marker { display: none; }
.page-about .about-region[open] > .about-region__summary {
  border-bottom: 1px solid var(--about-rule-soft);
  background: rgba(155, 179, 164, .14);
}
.page-about .about-region__no {
  font-family: var(--db-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--db-copper);
}
.page-about .about-region__name {
  font-family: var(--db-serif);
  font-weight: 600;
  font-size: 16px;
  color: var(--db-ink);
}
.page-about .about-region__meta {
  margin-left: auto;
  font-size: 12px;
  line-height: 1.6;
  color: var(--db-rock);
}
.page-about .about-region__body { padding: 6px 16px 16px; }
.page-about .about-region__dl { margin: 0; }
.page-about .about-region__row {
  padding: 10px 0;
  border-top: 1px dashed var(--about-rule-soft);
}
.page-about .about-region__row:first-child { border-top: 0; }
.page-about .about-region__row dt {
  font-family: var(--db-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--db-copper-deep);
}
.page-about .about-region__row dd {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--db-body-text);
}

/* ---------- 尾部引导 ---------- */
.page-about .about-cta {
  background: var(--db-brown);
  color: var(--db-cream);
  border-top: 2px solid var(--db-copper);
}
.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  padding-top: 34px;
  padding-bottom: 38px;
}
.page-about .about-cta__title {
  margin: 0;
  font-family: var(--db-serif);
  font-weight: 600;
  font-size: 21px;
  line-height: 1.4;
  letter-spacing: .02em;
  color: var(--db-cream);
}
.page-about .about-cta__desc {
  margin: 12px 0 0;
  max-width: 38em;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(246, 242, 233, .74);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .about-cta .db-btn--ghost {
  color: var(--db-copper-bright);
  border-color: rgba(217, 168, 94, .5);
  background: transparent;
}

/* ---------- 平板 ---------- */
@media (min-width: 780px) {
  .page-about .about-hero { padding-top: 42px; }
  .page-about .about-hero h1 { font-size: 40px; }
  .page-about .about-hero__lead { font-size: 16px; }
  .page-about .about-hero__stats { grid-template-columns: repeat(5, 1fr); }
  .page-about .about-hero__stat { padding: 20px 16px 22px; }
  .page-about .about-hero__stat b { font-size: 34px; }

  .page-about .about-section { padding: 40px 0 12px; }
  .page-about .about-section__title { font-size: 26px; }
  .page-about .about-section__lede { font-size: 16px; }

  .page-about .about-timeline__year { font-size: 26px; }
  .page-about .about-timeline__label { font-size: 20px; }

  .page-about .about-team { grid-template-columns: repeat(3, 1fr); }
  .page-about .about-team__facts { grid-template-columns: repeat(4, 1fr); }

  .page-about .about-security { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 32px; align-items: start; }

  .page-about .about-partners { grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: 32px; align-items: start; }
  .page-about .about-partners__numbers { grid-template-columns: 1fr; }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
    padding-top: 40px;
    padding-bottom: 44px;
  }
  .page-about .about-cta__actions { justify-content: flex-end; }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1024px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: end;
    padding-bottom: 38px;
  }
  .page-about .about-hero h1 { font-size: 44px; }

  .page-about .about-body {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: 52px;
    align-items: start;
    padding-top: 42px;
    padding-bottom: 72px;
  }
  .page-about .about-index {
    position: sticky;
    top: calc(var(--db-header-h) + 28px);
    border-top: 0;
    border-left: 1px solid var(--about-rule);
    padding: 2px 0 2px 18px;
    margin-bottom: 0;
  }
  .page-about .about-index__list {
    display: block;
    overflow: visible;
    padding: 0;
  }
  .page-about .about-index__item + .about-index__item { margin-top: 6px; }
  .page-about .about-index__link {
    padding: 5px 0;
    border: 0;
    background: none;
    font-size: 14px;
    white-space: normal;
  }
  .page-about .about-index__link[aria-current="true"] {
    background: none;
    color: var(--db-copper-deep);
  }
  .page-about .about-index__link[aria-current="true"]::before {
    content: "";
    display: inline-block;
    width: 6px;
    height: 6px;
    margin-right: 8px;
    background: var(--db-copper);
    vertical-align: middle;
  }
  .page-about .about-index__foot { display: block; }

  .page-about .about-timeline__item {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 0;
    padding-left: 0;
    border-left: 0;
    padding-bottom: 32px;
  }
  .page-about .about-timeline__item::before { display: none; }
  .page-about .about-timeline__year {
    font-size: 40px;
    text-align: right;
    padding-right: 24px;
  }
  .page-about .about-timeline__panel {
    position: relative;
    border-left: 1px solid var(--about-rule);
    padding-left: 26px;
  }
  .page-about .about-timeline__panel::before {
    content: "";
    position: absolute;
    left: -4px;
    top: 12px;
    width: 7px;
    height: 7px;
    background: var(--db-copper);
  }
  .page-about .about-timeline__label { font-size: 21px; }
  .page-about .about-timeline__body p { font-size: 15px; }
}