.page-about {
  --about-rail-w: 142px;
  --about-line: rgba(232, 238, 245, 0.14);
  padding-bottom: 64px;
}

.page-about .about-topline {
  padding-top: 16px;
}

/* 首屏声明 */
.page-about .about-mast {
  position: relative;
  padding: 20px 0 44px;
  border-bottom: 1px solid var(--db-hairline);
  background:
    radial-gradient(120% 110% at 6% 0%, rgba(200, 112, 47, 0.20), rgba(200, 112, 47, 0) 62%),
    linear-gradient(180deg, var(--db-ink-800), var(--db-ink-900));
}

.page-about .about-mast__inner {
  display: grid;
  gap: 30px;
}

.page-about .about-mast h1 {
  margin: 10px 0 16px;
  font-size: clamp(27px, 5.4vw, 46px);
  line-height: 1.22;
  letter-spacing: 0.03em;
  font-weight: 900;
  color: var(--db-text);
  max-width: 20ch;
}

.page-about .about-mast__lede {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--db-text-soft);
}

.page-about .about-mast__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 12px;
  margin: 0;
}

.page-about .about-stat {
  padding: 2px 0 2px 12px;
  border-left: 2px solid var(--db-copper-500);
}

.page-about .about-stat dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--db-muted);
}

.page-about .about-stat dd {
  margin: 5px 0 0;
  font-size: 14px;
  color: var(--db-text-soft);
}

.page-about .about-stat__num {
  margin-right: 3px;
  font-size: 24px;
  font-weight: 700;
  color: var(--db-copper-300);
  letter-spacing: 0.02em;
}

/* 主体骨架 */
.page-about .about-shell {
  display: grid;
  gap: 26px;
  padding-top: 34px;
}

.page-about .about-rail__label {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--db-muted);
}

.page-about .about-rail__list {
  list-style: none;
  display: flex;
  gap: 8px;
  margin: 10px 0 0;
  padding: 0 0 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: inline-flex;
  flex: 0 0 auto;
  padding: 7px 12px 7px 10px;
  border-left: 2px solid var(--db-copper-500);
  background: rgba(232, 238, 245, 0.04);
  color: var(--db-text-soft);
  font-family: var(--db-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--db-cyan-400);
  border-left-color: var(--db-cyan-400);
  background: rgba(53, 211, 209, 0.08);
}

.page-about .about-sec {
  margin-bottom: 60px;
}

.page-about .db-section__head {
  margin-bottom: 22px;
}

.page-about .db-section__title {
  margin: 8px 0 12px;
  font-size: clamp(22px, 3.4vw, 29px);
  line-height: 1.32;
  letter-spacing: 0.02em;
  color: var(--db-text);
}

.page-about .db-section__lede {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--db-text-soft);
}

/* 图版 */
.page-about .about-figure {
  margin: 26px 0 0;
}

.page-about .about-figure--tight {
  margin-top: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--db-hairline);
  border-radius: var(--db-radius);
  background: var(--db-ink-700);
  box-shadow: var(--db-shadow-2);
  object-fit: cover;
}

.page-about .about-figure__cap {
  margin-top: 9px;
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--db-muted);
}

/* 沿革时间线 */
.page-about .about-timeline {
  position: relative;
  margin-top: 30px;
  padding-left: 18px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 4px;
  bottom: 4px;
  width: 1px;
  background: linear-gradient(180deg, var(--db-copper-500), rgba(200, 112, 47, 0.1));
}

.page-about .about-stage {
  position: relative;
  margin-bottom: 16px;
  background: var(--db-ink-800);
  border: 1px solid var(--db-hairline);
  border-radius: var(--db-radius);
  box-shadow: var(--db-shadow-1);
  transition: border-color 0.2s ease;
}

.page-about .about-stage:hover {
  border-color: rgba(233, 160, 99, 0.42);
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -18px;
  top: 20px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--db-copper-500);
  box-shadow: 0 0 0 3px rgba(200, 112, 47, 0.18);
}

.page-about .about-stage__head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-weight: 700;
  font-size: 16px;
  color: var(--db-text);
}

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

.page-about .about-stage__head::after {
  content: "+";
  margin-left: 10px;
  font-family: var(--db-mono);
  font-size: 15px;
  color: var(--db-copper-300);
}

.page-about .about-stage[open] .about-stage__head::after {
  content: "–";
  color: var(--db-cyan-400);
}

.page-about .about-stage__no {
  flex: 0 0 auto;
  padding-left: 8px;
  border-left: 2px solid var(--db-copper-500);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--db-copper-300);
}

.page-about .about-stage__title {
  flex: 1 1 auto;
  min-width: 0;
}

.page-about .about-stage__tag {
  flex: 0 0 auto;
}

.page-about .about-stage__body {
  padding: 0 16px 18px;
  border-top: 1px solid var(--db-hairline-soft);
}

.page-about .about-stage__body p {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--db-text-soft);
}

/* 覆盖：非对称两栏 */
.page-about .about-split {
  display: grid;
  gap: 28px;
}

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

.page-about .about-scenario {
  padding: 18px 0;
  border-top: 1px solid var(--db-hairline);
}

.page-about .about-scenario:last-child {
  border-bottom: 1px solid var(--db-hairline);
}

.page-about .about-scenario h3 {
  margin: 0 0 7px;
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--db-text);
}

.page-about .about-scenario p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--db-text-soft);
}

.page-about .about-scenario a,
.page-about .about-inline {
  color: var(--db-copper-300);
  font-family: var(--db-mono);
  font-size: 12.5px;
  letter-spacing: 0.03em;
  text-decoration: none;
  border-bottom: 1px dashed rgba(233, 160, 99, 0.5);
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .about-scenario a:hover,
.page-about .about-inline:hover,
.page-about .about-scenario a:focus-visible,
.page-about .about-inline:focus-visible {
  color: var(--db-cyan-400);
  border-bottom-color: var(--db-cyan-400);
}

.page-about .about-side {
  padding: 20px 18px;
  background: var(--db-ink-700);
  border: 1px solid var(--db-hairline);
  border-radius: var(--db-radius);
  box-shadow: var(--db-shadow-2);
}

.page-about .about-side__label {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--db-cyan-400);
}

.page-about .about-side__title {
  margin: 8px 0 14px;
  font-size: 17px;
  color: var(--db-text);
}

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

.page-about .about-kv__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px solid var(--db-hairline-soft);
}

.page-about .about-kv__row:first-child {
  border-top: 1px solid var(--db-hairline-soft);
}

.page-about .about-kv dt {
  font-size: 13px;
  color: var(--db-muted);
}

.page-about .about-kv dd {
  margin: 0;
  font-size: 12.5px;
  text-align: right;
  color: var(--db-text-soft);
  word-break: break-word;
}

.page-about .about-side__note {
  margin: 14px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--db-muted);
}

/* 团队：酒红换气画板 */
.page-about .about-team {
  margin: 0 0 60px;
  padding: 30px 22px 34px;
  border-radius: var(--db-radius);
  border: 1px solid rgba(232, 238, 245, 0.18);
  background:
    radial-gradient(90% 130% at 100% 0%, rgba(53, 211, 209, 0.14), rgba(53, 211, 209, 0) 58%),
    linear-gradient(158deg, var(--db-wine-600), #4a1e2b 92%);
  box-shadow: var(--db-shadow-2);
}

.page-about .about-team .db-section__title {
  color: #f7f0e6;
}

.page-about .about-team .db-section__lede {
  color: rgba(244, 241, 234, 0.86);
}

.page-about .about-team .db-kicker {
  color: var(--db-copper-300);
}

.page-about .about-team__inner {
  display: grid;
  gap: 24px;
}

.page-about .about-team__text p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 241, 234, 0.9);
}

.page-about .about-team__contact {
  margin: 18px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--db-copper-300);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--db-paper);
}

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

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid rgba(244, 241, 234, 0.28);
  border-radius: var(--db-radius);
  object-fit: cover;
}

.page-about .about-team__cap {
  margin-top: 9px;
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: rgba(244, 241, 234, 0.66);
}

/* 条目生产 */
.page-about .about-split--writing {
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-parts {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: none;
}

.page-about .about-part {
  position: relative;
  padding: 16px 0 16px 44px;
  border-top: 1px solid var(--db-hairline);
}

.page-about .about-part:last-child {
  border-bottom: 1px solid var(--db-hairline);
}

.page-about .about-part__no {
  position: absolute;
  left: 0;
  top: 18px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--db-copper-500);
}

.page-about .about-part h3 {
  margin: 0 0 6px;
  font-size: 16px;
  color: var(--db-text);
}

.page-about .about-part p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--db-text-soft);
}

.page-about .about-writing__aside {
  display: grid;
  gap: 22px;
  align-content: start;
}

.page-about .about-windows {
  display: grid;
  gap: 14px;
}

.page-about .about-window {
  padding: 16px 16px 18px;
  background: var(--db-ink-800);
  border: 1px solid var(--db-hairline);
  border-left: 2px solid var(--db-copper-500);
  border-radius: var(--db-radius);
  box-shadow: var(--db-shadow-1);
}

.page-about .about-window__label {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--db-copper-300);
}

.page-about .about-window h3 {
  margin: 7px 0 8px;
  font-size: 16px;
  color: var(--db-text);
}

.page-about .about-window p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--db-text-soft);
}

.page-about .about-window a {
  display: inline-block;
  margin-top: 10px;
}

/* 承诺清单 */
.page-about .about-promise {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--db-hairline);
}

.page-about .about-promise__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 15px 0;
  border-bottom: 1px solid var(--db-hairline);
}

.page-about .about-promise__num {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--db-copper-300);
}

.page-about .about-promise__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.74;
  color: var(--db-text-soft);
}

/* 联系 */
.page-about .about-contact {
  margin-top: 4px;
  padding: 26px 20px 24px;
  border: 1px solid var(--db-hairline);
  border-radius: var(--db-radius);
  background:
    linear-gradient(140deg, rgba(42, 42, 94, 0.55), rgba(10, 21, 38, 0.9) 72%),
    var(--db-ink-800);
  box-shadow: var(--db-shadow-2);
}

.page-about .about-contact__grid {
  display: grid;
  gap: 26px;
}

.page-about .about-contact__lede {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--db-text-soft);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.page-about .about-kv--contact dd {
  font-size: 12.5px;
  color: var(--db-text);
}

.page-about .about-contact__more {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--db-hairline-soft);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--db-muted);
}

@media (min-width: 720px) {
  .page-about .about-mast {
    padding: 28px 0 52px;
  }

  .page-about .about-timeline {
    padding-left: 34px;
  }

  .page-about .about-timeline::before {
    left: 6px;
  }

  .page-about .about-stage::before {
    left: -34px;
    top: 22px;
  }

  .page-about .about-team {
    padding: 38px 34px 40px;
  }

  .page-about .about-contact {
    padding: 34px 32px 30px;
  }

  .page-about .about-windows {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-mast__inner {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.8fr);
    align-items: end;
    gap: 40px;
  }

  .page-about .about-stage:nth-of-type(1) {
    width: 100%;
  }

  .page-about .about-stage:nth-of-type(2) {
    width: calc(100% - 26px);
  }

  .page-about .about-stage:nth-of-type(3) {
    width: calc(100% - 52px);
  }

  .page-about .about-stage:nth-of-type(4) {
    width: calc(100% - 78px);
  }
}

@media (min-width: 960px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 48px;
    padding-top: 48px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--db-header-h) + 20px);
    align-self: start;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    background: none;
    padding: 8px 0 8px 12px;
    border-left: 1px solid var(--db-hairline);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: none;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-split--writing {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
  }

  .page-about .about-team__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.95fr);
    align-items: center;
    gap: 34px;
  }

  .page-about .about-contact__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.8fr);
    gap: 40px;
    align-items: start;
  }
}
<<<PAGE_CSS_END>>>