.page-about {
  --about-measure: 720px;
  --about-hair: rgba(42, 79, 107, 0.55);
  --about-hair-soft: rgba(42, 79, 107, 0.32);
  display: block;
  color: var(--text);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: 22px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 5vw, 54px) 0 clamp(34px, 6vw, 76px);
  border-bottom: 1px solid var(--steel);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(18, 217, 196, 0.09), rgba(6, 18, 31, 0) 62%),
    linear-gradient(180deg, #08202f 0%, var(--ink-900) 78%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(20, 48, 72, 0.85) 1px, transparent 1px),
    linear-gradient(90deg, rgba(20, 48, 72, 0.85) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.3;
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(36px, 8.4vw, 92px);
  line-height: 0.98;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-hero__title span {
  display: block;
  color: var(--turf);
  transform: skewX(-2deg);
  transform-origin: left center;
}

.page-about .about-hero__lede {
  max-width: 56ch;
  margin: 20px 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* 首屏数据块 */
.page-about .about-tally {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--about-hair);
  border: 1px solid var(--steel);
}

.page-about .about-tally__item {
  background: var(--ink-800);
  padding: 16px 16px 18px;
  transition: background var(--dur) var(--ease);
}

.page-about .about-tally__item:hover {
  background: var(--ink-700);
}

.page-about .about-tally dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-tally dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 32px;
  line-height: 1;
  font-weight: 700;
  color: var(--turf);
}

.page-about .about-tally dd span {
  margin-left: 6px;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  padding-top: clamp(46px, 7vw, 92px);
  padding-bottom: clamp(46px, 7vw, 92px);
  border-bottom: 1px solid var(--about-hair-soft);
}

.page-about .about-sec__head {
  max-width: var(--about-measure);
  margin-bottom: clamp(22px, 3.6vw, 38px);
}

.page-about .about-sec__head .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .section__title {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(26px, 4.2vw, 42px);
  line-height: 1.12;
  color: var(--text);
}

.page-about .section__meta {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 01 起点 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-split__text {
  max-width: var(--about-measure);
}

.page-about .about-split__text p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: #c8d8e2;
}

.page-about .about-split__text p:first-child::first-letter {
  font-family: var(--font-mono);
  font-size: 2.2em;
  line-height: 1;
  float: left;
  margin: 4px 10px 0 0;
  color: var(--turf);
}

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

.page-about .frame {
  border: 1px solid var(--steel);
  background: var(--ink-800);
  overflow: hidden;
}

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

.page-about .frame__caption {
  padding: 10px 14px;
  border-top: 1px solid var(--about-hair);
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 02 覆盖 ---------- */
.page-about .about-field__banner {
  margin: 0;
}

.page-about .about-field__banner .frame__media {
  aspect-ratio: 1400 / 620;
  height: auto;
}

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

.page-about .about-field__item {
  position: relative;
  background: var(--ink-800);
  padding: clamp(16px, 2.4vw, 26px);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-field__item:hover {
  background: var(--ink-700);
  box-shadow: inset 0 0 0 1px var(--turf);
}

.page-about .about-field__idx {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-field__name {
  display: block;
  margin-top: 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 22px;
  line-height: 1.2;
  color: var(--text);
}

.page-about .about-field__note {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 03 流程 ---------- */
.page-about .about-flow {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-flow__steps {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--about-hair);
  border: 1px solid var(--steel);
}

.page-about .about-flow__step {
  position: relative;
  background: var(--ink-800);
  padding: clamp(18px, 3vw, 28px) clamp(18px, 3vw, 28px) clamp(18px, 3vw, 28px) clamp(24px, 3.4vw, 34px);
  transition: background var(--dur) var(--ease);
}

.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--steel);
  transition: background var(--dur) var(--ease);
}

.page-about .about-flow__step:hover {
  background: var(--ink-700);
}

.page-about .about-flow__step:hover::before {
  background: var(--turf);
}

.page-about .about-flow__idx {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-flow__step h3 {
  margin: 8px 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.3;
  color: var(--text);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

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

/* ---------- 04 时间线 ---------- */
.page-about .about-tl {
  list-style: none;
  position: relative;
  margin: 0 0 0 5px;
  padding: 0;
  border-left: 1px solid var(--steel);
}

.page-about .about-tl__node {
  position: relative;
  padding: 22px 0 22px 26px;
  transition: background var(--dur) var(--ease);
}

.page-about .about-tl__node::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 30px;
  width: 9px;
  height: 9px;
  background: var(--turf);
  box-shadow: 0 0 0 3px rgba(59, 245, 166, 0.14);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-tl__node:hover {
  background: linear-gradient(90deg, rgba(20, 48, 72, 0.55), rgba(6, 18, 31, 0));
}

.page-about .about-tl__node:hover::before {
  transform: scale(1.25);
  box-shadow: 0 0 0 5px rgba(59, 245, 166, 0.18);
}

.page-about .about-tl__mark {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--turf);
}

.page-about .about-tl__title {
  margin: 8px 0 6px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.3;
  color: var(--text);
}

.page-about .about-tl__text {
  margin: 0;
  max-width: 46ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
  transition: color var(--dur) var(--ease);
}

.page-about .about-tl__node:hover .about-tl__text {
  color: #c8d8e2;
}

/* ---------- 05 团队 ---------- */
.page-about .about-team {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--steel);
  background: var(--ink-800);
}

.page-about .about-team caption {
  padding: 0 0 12px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-team th,
.page-about .about-team td {
  text-align: left;
  vertical-align: top;
  padding: 14px clamp(12px, 2vw, 22px);
  border-bottom: 1px solid var(--about-hair);
  font-size: 14.5px;
  line-height: 1.7;
}

.page-about .about-team thead th {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.14em;
  color: var(--muted);
  background: var(--ink-700);
}

.page-about .about-team tbody th,
.page-about .about-team tfoot th {
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
}

.page-about .about-team tbody td:last-child {
  color: var(--muted);
}

.page-about .about-team td.num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--turf);
  width: 92px;
  white-space: nowrap;
}

.page-about .about-team tfoot th,
.page-about .about-team tfoot td {
  background: var(--ink-700);
  border-bottom: 0;
}

.page-about .about-team tfoot td:last-child {
  color: var(--muted);
}

/* ---------- 06 承诺 ---------- */
.page-about .about-sec--promise {
  border-bottom: 0;
}

.page-about .about-promise {
  list-style: none;
  display: grid;
  gap: clamp(14px, 2.4vw, 24px);
  margin: 0;
  padding: 0;
}

.page-about .about-promise__item {
  position: relative;
  border: 1px solid var(--steel);
  background: linear-gradient(160deg, var(--ink-800), rgba(6, 18, 31, 0.9));
  padding: clamp(20px, 3vw, 30px);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-promise__item:hover {
  border-color: var(--turf);
  box-shadow: 0 0 0 1px rgba(59, 245, 166, 0.18);
}

.page-about .about-promise__num {
  display: inline-block;
  padding: 2px 7px;
  border: 1px solid var(--steel);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-promise__title {
  margin: 14px 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.3;
  color: var(--text);
}

.page-about .about-promise__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 收尾导航 ---------- */
.page-about .about-next {
  margin-top: clamp(38px, 6vw, 84px);
  border-top: 1px solid var(--steel);
  background:
    radial-gradient(90% 140% at 6% 0%, rgba(18, 217, 196, 0.08), rgba(6, 18, 31, 0) 60%),
    linear-gradient(120deg, var(--ink-800), var(--ink-900));
}

.page-about .about-next__inner {
  display: grid;
  gap: 18px;
  align-items: center;
  padding-top: clamp(28px, 4vw, 46px);
  padding-bottom: clamp(34px, 5vw, 58px);
}

.page-about .about-next__text {
  max-width: 60ch;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: #c8d8e2;
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 760px) {
  .page-about .about-field__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.86fr);
    align-items: end;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.84fr);
    align-items: start;
  }

  .page-about .about-flow {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .about-tl {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    margin: 0;
    border-left: 0;
    border-top: 1px solid var(--steel);
  }

  .page-about .about-tl__node {
    padding: 30px 16px 6px;
  }

  .page-about .about-tl__node::before {
    left: 16px;
    top: -5px;
  }

  .page-about .about-tl__node:hover {
    background: linear-gradient(180deg, rgba(20, 48, 72, 0.55), rgba(6, 18, 31, 0));
  }

  .page-about .about-tl__text {
    max-width: none;
  }

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

/* ---------- 窄屏：团队表转卡片 ---------- */
@media (max-width: 639px) {
  .page-about .about-team {
    border: 0;
    background: transparent;
  }

  .page-about .about-team thead {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
  }

  .page-about .about-team tbody tr,
  .page-about .about-team tfoot tr {
    display: block;
    margin-bottom: 10px;
    padding: 14px 16px;
    border: 1px solid var(--steel);
    background: var(--ink-800);
  }

  .page-about .about-team tfoot tr {
    background: var(--ink-700);
  }

  .page-about .about-team th,
  .page-about .about-team td {
    display: block;
    width: auto;
    padding: 0;
    border-bottom: 0;
  }

  .page-about .about-team tbody th,
  .page-about .about-team tfoot th {
    font-family: var(--font-head);
    font-size: 17px;
    white-space: normal;
  }

  .page-about .about-team td.num {
    margin: 6px 0 8px;
    font-size: 22px;
  }

  .page-about .about-team tbody td:last-child,
  .page-about .about-team tfoot td:last-child {
    font-size: 14px;
    color: var(--muted);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tally__item,
  .page-about .about-field__item,
  .page-about .about-flow__step,
  .page-about .about-flow__step::before,
  .page-about .about-tl__node,
  .page-about .about-tl__node::before,
  .page-about .about-tl__text,
  .page-about .about-promise__item {
    transition: none;
  }

  .page-about .about-hero__title span {
    transform: none;
  }

  .page-about .about-tl__node:hover::before {
    transform: none;
  }
}