.page-about {
  --tl-col: 56px;
  --tl-gap: 20px;
  background: var(--paper);
  color: var(--ink);
}

@media (min-width: 880px) {
  .page-about {
    --tl-col: 200px;
    --tl-gap: 32px;
  }
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  border-bottom: 3px solid var(--ink);
  background-image:
    repeating-linear-gradient(90deg, rgba(43, 61, 92, 0.09) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(0deg, rgba(43, 61, 92, 0.09) 0 1px, transparent 1px 48px);
}

.page-about .about-crumbs {
  display: block;
  padding-top: 20px;
  font-size: 13px;
  letter-spacing: 0.04em;
}

.page-about .about-hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding-top: 22px;
  padding-bottom: 36px;
}

@media (min-width: 900px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 48px;
    padding-top: 40px;
    padding-bottom: 56px;
    align-items: end;
  }
}

.page-about .about-h1 {
  margin: 0;
  font-size: clamp(34px, 7vw, 74px);
  line-height: 0.98;
  letter-spacing: -0.03em;
  font-weight: 900;
  color: var(--ink);
}

.page-about .about-h1 em {
  font-style: normal;
  color: var(--orange);
}

.page-about .about-lede {
  margin: 18px 0 0;
  max-width: 56ch;
  font-size: clamp(15px, 1.8vw, 17px);
  line-height: 1.78;
  color: var(--ink-2);
}

.page-about .about-facts {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 3px solid var(--ink);
}

.page-about .about-fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 11px 2px;
  border-bottom: 1px solid rgba(43, 61, 92, 0.35);
}

.page-about .about-fact-k {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--blueprint);
}

.page-about .about-fact-v {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 20px;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

/* ---------- 通用区块 ---------- */
.page-about .about-section {
  padding: 44px 0;
}

@media (min-width: 880px) {
  .page-about .about-section {
    padding: 68px 0;
  }
}

.page-about .about-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 3px solid var(--ink);
  margin-bottom: 26px;
}

.page-about .about-head h2 {
  margin: 0;
  font-size: clamp(23px, 3.2vw, 38px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-text {
  max-width: 68ch;
}

.page-about .about-text p {
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.8;
}

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

.page-about .figure-frame {
  max-width: 100%;
  margin: 0;
}

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

.page-about .figure-frame figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--blueprint);
}

/* ---------- 深色带 ---------- */
.page-about .about-band {
  background: var(--ink);
  color: var(--paper);
}

.page-about .about-band .about-head {
  border-bottom-color: var(--blueprint);
}

.page-about .about-band .about-head h2 {
  color: var(--paper);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: calc(var(--tl-col) + var(--tl-gap) / 2 - 1.5px);
  width: 3px;
  background: var(--blueprint);
}

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: var(--tl-col) minmax(0, 1fr);
  gap: var(--tl-gap);
  padding-bottom: 22px;
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  top: 12px;
  left: calc(var(--tl-col) + var(--tl-gap) / 2 - 6px);
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--green-lt);
  box-shadow: 0 0 0 4px var(--ink);
}

.page-about .tl-year {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(19px, 4vw, 30px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  text-align: right;
  color: var(--green-lt);
  font-variant-numeric: tabular-nums;
}

.page-about .tl-card {
  background: var(--ink-2);
  border: 1px solid var(--blueprint);
  border-left: 4px solid var(--green);
  padding: 16px 18px;
}

.page-about .tl-card h3 {
  margin: 0 0 8px;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.3;
  font-weight: 700;
  color: var(--paper);
}

.page-about .tl-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--data);
}

.page-about .tl-more {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--blueprint);
}

.page-about .tl-more summary {
  cursor: pointer;
  list-style: none;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--green-lt);
}

.page-about .tl-more summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-more summary::after {
  content: " ＋";
}

.page-about .tl-more[open] summary::after {
  content: " －";
}

.page-about .tl-more ul {
  margin: 10px 0 0;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--stone);
}

.page-about .about-tl-figure {
  margin-top: 30px;
  border: 3px solid var(--blueprint);
  padding: 8px;
  background: var(--ink-2);
}

.page-about .about-tl-figure figcaption {
  color: var(--stone);
  padding: 0 2px;
}

/* ---------- 三个小组 ---------- */
.page-about .about-teams {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 26px;
}

@media (min-width: 780px) {
  .page-about .about-teams {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .about-teams > .team-card:nth-child(2) {
    margin-top: 34px;
  }

  .page-about .about-teams > .team-card:nth-child(3) {
    margin-top: 68px;
  }
}

.page-about .team-card {
  background: var(--paper);
  border: 3px solid var(--ink);
  box-shadow: var(--shadow-hard);
  padding: 16px 16px 20px;
  transition: box-shadow 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .team-card:hover {
  box-shadow: var(--shadow-hard-sm);
  transform: translate(4px, 4px);
}

.page-about .team-top {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 2px solid var(--ink);
}

.page-about .team-swatch {
  display: block;
  width: 30px;
  height: 8px;
}

.page-about .team-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 30px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .team-card h3 {
  margin: 8px 0 8px;
  font-size: 19px;
  line-height: 1.3;
  font-weight: 700;
  color: var(--ink);
}

.page-about .team-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink-2);
}

/* ---------- 运营基地 ---------- */
.page-about .about-base-band {
  background: var(--data);
  border-top: 3px solid var(--ink);
  border-bottom: 3px solid var(--ink);
}

.page-about .about-base {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-bottom: 26px;
}

@media (min-width: 900px) {
  .page-about .about-base {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 40px;
    align-items: start;
  }
}

.page-about .about-base .figure-frame {
  border: 3px solid var(--ink);
  background: var(--paper);
  padding: 6px;
}

.page-about .about-base-photo {
  border: 3px solid var(--ink);
  background: var(--paper);
  padding: 6px;
  box-shadow: var(--shadow-hard);
}

/* ---------- 等高线分隔 ---------- */
.page-about .about-contour {
  display: block;
  width: 100%;
  height: auto;
  color: var(--green);
  opacity: 0.14;
  margin: 6px 0;
}

/* ---------- 合作生态 ---------- */
.page-about .about-coop-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 3px;
  background: var(--ink);
  border: 3px solid var(--ink);
  margin-bottom: 24px;
}

@media (min-width: 720px) {
  .page-about .about-coop-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .coop-stat {
  display: flex;
  align-items: baseline;
  gap: 10px;
  background: var(--paper);
  padding: 16px 14px;
}

.page-about .coop-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 32px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}

.page-about .coop-label {
  font-size: 13px;
  line-height: 1.4;
  letter-spacing: 0.04em;
  color: var(--ink-2);
}

/* ---------- 三条规矩 ---------- */
.page-about .about-section--rules {
  border-top: 3px solid var(--ink);
}

.page-about .about-rules {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

@media (min-width: 860px) {
  .page-about .about-rules {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 30px;
  }
}

.page-about .rule {
  border-left: 6px solid var(--orange);
  padding: 2px 0 2px 16px;
}

.page-about .rule h3 {
  margin: 0 0 8px;
  font-size: 19px;
  line-height: 1.32;
  font-weight: 700;
  color: var(--ink);
}

.page-about .rule p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-2);
}

/* ---------- 收尾 ---------- */
.page-about .about-band--next {
  border-top: 4px solid var(--green);
}

.page-about .about-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

@media (min-width: 760px) {
  .page-about .about-next {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
}

.page-about .next-card {
  display: block;
  text-decoration: none;
  background: var(--ink-2);
  border: 1px solid var(--blueprint);
  border-left: 4px solid var(--orange);
  padding: 20px 18px;
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  border-color: var(--green-lt);
}

.page-about .next-tag {
  display: inline-block;
  color: var(--green-lt);
  margin-bottom: 8px;
}

.page-about .next-card h3 {
  margin: 0 0 8px;
  font-size: 20px;
  line-height: 1.3;
  font-weight: 700;
  color: var(--paper);
}

.page-about .next-card p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--data);
}

.page-about .next-go {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--orange);
}

.page-about .about-next-links {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--data);
}

.page-about .about-next-links a {
  color: var(--green-lt);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-next-links a:hover {
  color: var(--orange);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .next-card {
    transition: none;
  }

  .page-about .team-card:hover {
    transform: none;
  }
}