.page-about {
  --about-rule: rgba(227, 220, 205, .16);
  --about-rule-strong: rgba(227, 220, 205, .3);
  --about-ink-rule: rgba(14, 27, 44, .14);
  --about-ink-soft: rgba(14, 27, 44, .72);
  --about-mist: #A9BDD1;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ===== 首屏 ===== */
.page-about .about-mast {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 4vw, 34px) 0 clamp(40px, 6vw, 84px);
  background:
    radial-gradient(120% 90% at 78% -10%, rgba(31, 51, 80, .9), rgba(14, 27, 44, 0) 58%),
    var(--ink-900);
  border-bottom: 1px solid var(--about-rule-strong);
}

.page-about .about-mast::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 88px),
    repeating-linear-gradient(180deg, var(--line) 0 1px, transparent 1px 88px);
  opacity: .55;
  pointer-events: none;
}

.page-about .about-mast > .container {
  position: relative;
  z-index: 1;
}

.page-about .about-mast__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(18px, 3vw, 34px);
}

.page-about .about-mast h1 {
  margin: clamp(12px, 2.4vw, 22px) 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(32px, 7.4vw, 88px);
  line-height: 1.03;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-mast .eyebrow,
.page-about .about-band .eyebrow {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--signal);
}

.page-about .about-mast .lead {
  margin: clamp(16px, 2.6vw, 26px) 0 0;
  max-width: 48ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: var(--about-mist);
}

.page-about .about-aside__title {
  margin: 0 0 10px;
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--stone);
}

.page-about .about-digest {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-rule-strong);
}

.page-about .about-digest li {
  position: relative;
  padding: 12px 0 12px 18px;
  border-bottom: 1px solid var(--about-rule);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--about-mist);
}

.page-about .about-digest li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
}

@media (min-width: 1080px) {
  .page-about .about-mast__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, .85fr);
    align-items: end;
  }
}

/* ===== 区块通用 ===== */
.page-about .about-band {
  padding: clamp(40px, 6vw, 88px) 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-h2 {
  margin: 8px 0 clamp(12px, 2vw, 18px);
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(23px, 3.6vw, 40px);
  line-height: 1.28;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .about-p {
  margin: 0 0 1.15em;
  max-width: 62ch;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.9;
  color: var(--about-mist);
}

.page-about .about-p:last-child {
  margin-bottom: 0;
}

.page-about .about-p strong {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: .94em;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .about-inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 208, .42);
  padding-bottom: 1px;
  transition: border-color .18s var(--ease);
}

.page-about .about-inline-link:hover {
  border-bottom-color: var(--cyan);
}

/* ===== 起点 ===== */
.page-about .about-origin {
  background: linear-gradient(180deg, var(--ink-800), var(--ink-900));
}

.page-about .about-origin__inner {
  max-width: 760px;
  padding-left: clamp(16px, 3vw, 32px);
  border-left: 2px solid var(--cyan);
}

.page-about .about-stamp {
  display: inline-block;
  margin: 0 0 16px;
  padding: 5px 10px;
  border: 1px solid var(--about-rule-strong);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--stone);
}

/* ===== 时间线 ===== */
.page-about .about-timeline {
  background: var(--ink-900);
}

.page-about .about-figure {
  margin: clamp(22px, 3.5vw, 40px) 0 clamp(26px, 4vw, 44px);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-rule-strong);
}

.page-about .about-figure .media-figure__caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--stone);
}

.page-about .about-track {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 25px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(53, 224, 208, .32) 48%, rgba(53, 224, 208, .05) 100%);
}

.page-about .about-track__item {
  position: relative;
  padding-left: 64px;
  margin-bottom: clamp(18px, 2.6vw, 26px);
}

.page-about .about-track__item:last-child {
  margin-bottom: 0;
}

.page-about .about-track__year {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 51px;
  height: 51px;
  border: 1px solid var(--about-rule-strong);
  border-radius: 50%;
  background: var(--ink-900);
  color: var(--cyan);
  font-size: 13px;
  letter-spacing: .02em;
}

.page-about .about-card {
  background: var(--paper);
  border: 1px solid var(--paper-shadow);
  box-shadow: 6px 6px 0 rgba(6, 14, 25, .35);
  padding: clamp(14px, 2vw, 20px);
}

.page-about .about-card__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 12px;
  row-gap: 8px;
  align-items: baseline;
  list-style: none;
  cursor: pointer;
}

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

.page-about .about-card__gen {
  padding: 3px 7px;
  border: 1px solid rgba(194, 112, 90, .42);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--clay);
  white-space: nowrap;
}

.page-about .about-card__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.4;
  color: var(--ink-900);
}

.page-about .about-card__sum {
  grid-column: 1 / -1;
  font-size: clamp(14px, 1.5vw, 15px);
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .about-card__more {
  grid-column: 1 / -1;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--clay);
}

.page-about .about-card__more::after {
  content: "";
  width: 7px;
  height: 7px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  transition: transform .2s var(--ease);
}

.page-about .about-card[open] .about-card__more::after {
  transform: rotate(225deg) translateY(-2px);
}

.page-about .about-card__extra {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--line-ink);
  font-size: 14px;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .about-card__extra p {
  margin: 0;
}

@media (min-width: 900px) {
  .page-about .about-track::before {
    left: 31px;
  }

  .page-about .about-track__item {
    padding-left: 84px;
  }

  .page-about .about-track__item:nth-child(even) {
    margin-left: 24px;
  }

  .page-about .about-track__year {
    width: 63px;
    height: 63px;
    font-size: 14px;
  }
}

/* ===== 内容组 ===== */
.page-about .about-team {
  background: var(--ink-800);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(22px, 3.5vw, 40px);
  margin-top: clamp(24px, 3.5vw, 40px);
}

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

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-rule);
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-rule-strong);
}

.page-about .about-roles li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  column-gap: 14px;
  padding: clamp(12px, 1.8vw, 16px) 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-roles .role-no {
  grid-row: 1 / span 2;
  padding-top: 4px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--signal);
}

.page-about .about-roles .role-name {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-roles .role-desc {
  grid-column: 2;
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-mist);
}

@media (min-width: 900px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    align-items: start;
  }
}

/* ===== 维护流程（纸色区） ===== */
.page-about .about-sheet {
  background: var(--paper);
  color: var(--ink-900);
  border-top: 1px solid var(--paper-shadow);
  border-bottom: 1px solid var(--paper-shadow);
}

.page-about .about-sheet .eyebrow {
  color: var(--clay);
}

.page-about .about-sheet .about-h2 {
  color: var(--ink-900);
}

.page-about .about-sheet .about-p {
  color: var(--about-ink-soft);
}

.page-about .about-sheet .about-inline-link {
  color: var(--clay);
  border-bottom-color: rgba(194, 112, 90, .45);
}

.page-about .about-flow {
  list-style: none;
  margin: clamp(24px, 3.5vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-ink-rule);
  border: 1px solid var(--about-ink-rule);
}

.page-about .about-flow__step {
  background: var(--paper);
  padding: clamp(16px, 2.4vw, 24px);
  transition: background .22s var(--ease);
}

.page-about .flow-no {
  display: block;
  margin-bottom: 10px;
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--clay);
}

.page-about .flow-name {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.5;
  color: var(--ink-900);
}

.page-about .flow-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .flow-meta {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: 12px;
  padding: 4px 9px;
  border: 1px solid rgba(111, 143, 106, .42);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--moss);
  transition: border-color .22s var(--ease), color .22s var(--ease);
}

.page-about .flow-meta::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--moss);
}

@media (min-width: 760px) {
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (hover: hover) {
  .page-about .about-flow__step:hover {
    background: #FBF9F4;
  }

  .page-about .about-flow__step:hover .flow-meta {
    border-color: rgba(111, 143, 106, .8);
    color: #5A7A56;
  }
}

/* ===== 节点 ===== */
.page-about .about-nodes {
  background: var(--ink-900);
}

.page-about .about-nodes__grid {
  display: grid;
  gap: clamp(22px, 3.5vw, 42px);
  margin-top: clamp(24px, 3.5vw, 40px);
}

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

.page-about .about-nodes__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-rule-strong);
}

.page-about .about-nodes__stat {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding-top: clamp(14px, 2vw, 20px);
  border-top: 1px solid var(--about-rule-strong);
}

.page-about .about-nodes__stat b {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 4.6vw, 52px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--signal);
}

.page-about .about-nodes__stat span {
  font-size: 12.5px;
  letter-spacing: .06em;
  line-height: 1.6;
  color: var(--mist);
}

@media (min-width: 900px) {
  .page-about .about-nodes__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: center;
  }
}

/* ===== 规模数据 ===== */
.page-about .about-scale {
  background: var(--ink-800);
}

.page-about .about-metrics {
  list-style: none;
  margin: clamp(24px, 3.5vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .about-metrics li {
  background: var(--ink-800);
  padding: clamp(16px, 2.6vw, 28px);
}

.page-about .about-metrics__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 4.4vw, 50px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-metrics__num em {
  font-style: normal;
  margin-left: 5px;
  font-size: .42em;
  letter-spacing: 0;
  color: var(--signal);
}

.page-about .about-metrics__label {
  display: block;
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--stone);
}

@media (min-width: 900px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ===== 收束 ===== */
.page-about .about-next {
  padding: clamp(42px, 6vw, 84px) 0 clamp(48px, 7vw, 96px);
  background: linear-gradient(180deg, var(--ink-900), var(--ink-800));
  border-top: 1px solid var(--about-rule-strong);
}

.page-about .about-next .about-h2 {
  margin-top: 0;
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-card__more::after,
  .page-about .flow-meta,
  .page-about .about-flow__step,
  .page-about .about-inline-link {
    transition: none;
  }
}