.page-about {
  --ab-sub-dark: rgba(237, 243, 238, 0.62);
  --ab-sub-cream: rgba(18, 16, 12, 0.64);
  --ab-panel-hi: #1b2834;
  --ab-card-cream: rgba(255, 255, 255, 0.56);

  padding-top: var(--bar-h);
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
}

@media (min-width: 1024px) {
  .page-about {
    padding-left: var(--rail-w);
  }
}

.page-about .breadcrumb {
  padding-top: 18px;
  padding-bottom: 4px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: 22px 0 56px;
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-hero .eyebrow {
  color: var(--grass-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin: 0;
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(2.2rem, 6.6vw, 4.2rem);
  line-height: 1.04;
  letter-spacing: -0.035em;
  color: var(--paper);
  max-width: 15em;
  text-wrap: balance;
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 44em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ab-sub-dark);
  text-wrap: pretty;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.page-about .about-hero__stats {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-hero__stats > div {
  background: var(--tone);
  padding: 16px 18px 18px;
}

.page-about .about-hero__stats dt {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .about-hero__stats dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 5vw, 2rem);
  line-height: 1.05;
  font-variant-numeric: tabular-nums;
  color: var(--paper);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 34px 0 76px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.9fr);
    align-items: end;
    gap: 48px;
  }

  .page-about .about-hero h1 {
    font-size: clamp(3rem, 5.6vw, 4.6rem);
  }
}

/* ---------- 章节骨架 ---------- */

.page-about .about-section {
  padding: 60px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-section--band {
  background: var(--cream);
  color: var(--ink);
  border-bottom-color: var(--sand);
}

.page-about .about-section .section-head {
  margin-bottom: 28px;
}

.page-about .about-section .section-num {
  color: var(--grass);
}

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

.page-about .about-section .section-desc {
  color: var(--ab-sub-dark);
  max-width: 46em;
}

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

.page-about .about-section--band .section-desc {
  color: var(--ab-sub-cream);
}

@media (min-width: 900px) {
  .page-about .about-section {
    padding: 88px 0;
  }
}

/* ---------- 01 四条数据线 ---------- */

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

.page-about .about-split__text > p:first-child {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ab-sub-dark);
  max-width: 40em;
  text-wrap: pretty;
}

.page-about .about-lines {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-lines li {
  background: var(--tone);
  padding: 16px 18px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "code title"
    "code text";
  gap: 4px 14px;
  transition: background 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .about-lines li:hover {
  background: var(--ab-panel-hi);
  box-shadow: inset 3px 0 0 var(--grass);
}

.page-about .about-lines__code {
  grid-area: code;
  align-self: start;
  margin-top: 2px;
  font-size: 11px;
  letter-spacing: 0.08em;
  padding: 3px 8px;
  border-radius: var(--r-sm);
  background: rgba(47, 164, 95, 0.14);
  border: 1px solid rgba(47, 164, 95, 0.34);
  color: var(--grass-soft);
}

.page-about .about-lines h3 {
  grid-area: title;
  margin: 0;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-lines p {
  grid-area: text;
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ab-sub-dark);
}

.page-about .about-split__more {
  margin: 20px 0 0;
  font-size: 14px;
}

.page-about .about-split__more a {
  color: var(--grass);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 164, 95, 0.4);
  padding-bottom: 2px;
}

.page-about .about-split__more a:hover {
  color: var(--grass-soft);
}

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

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

.page-about .about-split__media .media-frame {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-split__media {
    position: sticky;
    top: calc(var(--bar-h) + 24px);
  }
}

/* ---------- 02 三级流程 ---------- */

.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .flow__step {
  background: var(--tone);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 22px 20px 24px;
  color: var(--paper);
  transition: border-color 180ms var(--ease), box-shadow 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .flow__step:hover {
  border-color: var(--grass);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.page-about .flow__index {
  display: block;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--grass-soft);
}

.page-about .flow__step h3 {
  margin: 12px 0 0;
  font-size: 20px;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.page-about .flow__step p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ab-sub-dark);
  text-wrap: pretty;
}

.page-about .flow__media {
  margin-top: 26px;
}

.page-about .flow__media .media-frame {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
}

.page-about .flow__media figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--mist);
}

@media (min-width: 760px) {
  .page-about .flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .flow__media {
    margin-top: 34px;
  }
}

/* ---------- 03 时间轴 ---------- */

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

.page-about .about-banner .media-frame {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .timeline-wrap {
  margin-top: 34px;
  padding-bottom: 22px;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .timeline-wrap:focus-visible {
  outline: 2px solid var(--grass);
  outline-offset: 4px;
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 10px 20px 6px;
  display: flex;
  gap: 14px;
  min-width: max-content;
}

.page-about .timeline__item {
  position: relative;
  scroll-snap-align: start;
  flex: 0 0 min(288px, 76vw);
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 28px 20px 20px;
  background: var(--cream);
  color: var(--ink);
  border-radius: var(--r-md);
  border-top: 3px solid var(--grass);
}

.page-about .timeline__dot {
  position: absolute;
  top: -10px;
  left: 22px;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: var(--grass);
  box-shadow: 0 0 0 4px var(--cream);
}

.page-about .timeline__era {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: #4d6355;
}

.page-about .timeline__item h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: 0.01em;
}

.page-about .timeline__more {
  margin-top: 4px;
}

.page-about .timeline__more summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: #3f6a4f;
}

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

.page-about .timeline__more summary::after {
  content: "＋";
  font-size: 12px;
  color: var(--grass);
}

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

.page-about .timeline__more p {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.72;
  color: rgba(18, 16, 12, 0.72);
}

@media (min-width: 900px) {
  .page-about .timeline {
    padding-inline: 32px;
    gap: 18px;
  }

  .page-about .timeline__item {
    flex-basis: 300px;
  }
}

/* ---------- 04 团队关系图 ---------- */

.page-about .team-map {
  display: grid;
  justify-items: center;
}

.page-about .team-map__root {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 28px;
  border-radius: var(--r-pill);
  background: var(--ink);
  border: 1px solid rgba(47, 164, 95, 0.5);
  color: var(--cream);
  margin-bottom: 34px;
}

.page-about .team-map__big {
  font-size: 30px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--grass-soft);
}

.page-about .team-map__cap {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cream);
}

.page-about .team-map__root::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -34px;
  width: 2px;
  height: 34px;
  background: var(--grass);
  transform: translateX(-50%);
}

.page-about .team-map__branches {
  list-style: none;
  margin: 0;
  padding: 0;
  width: 100%;
  display: grid;
  gap: 14px;
}

.page-about .team-node {
  position: relative;
  padding: 20px 18px 22px;
  border: 1px solid var(--sand);
  border-radius: var(--r-md);
  background: var(--ab-card-cream);
  text-align: center;
  transition: border-color 180ms var(--ease), background 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .team-node:hover {
  border-color: var(--grass);
  background: #ffffff;
  transform: translateY(-3px);
}

.page-about .team-node__num {
  display: block;
  font-size: 34px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--grass);
}

.page-about .team-node h3 {
  margin: 12px 0 0;
  font-size: 16px;
  font-weight: 500;
  color: var(--ink);
}

.page-about .team-node p {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--ab-sub-cream);
}

@media (min-width: 820px) {
  .page-about .team-map__branches {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
    padding-top: 28px;
  }

  .page-about .team-map__branches::before {
    content: "";
    position: absolute;
    top: 0;
    left: 16.66%;
    right: 16.66%;
    height: 2px;
    background: var(--grass);
    opacity: 0.45;
  }

  .page-about .team-node::before {
    content: "";
    position: absolute;
    top: -28px;
    left: 50%;
    width: 2px;
    height: 28px;
    background: var(--grass);
    opacity: 0.45;
    transform: translateX(-50%);
  }

  .page-about .team-node:hover::before {
    opacity: 1;
  }
}

/* ---------- 05 合作生态 ---------- */

.page-about .eco {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 4px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .eco__stat {
  background: var(--tone);
  padding: 20px 16px 22px;
}

.page-about .eco__num {
  display: block;
  font-size: clamp(1.6rem, 5vw, 2.2rem);
  line-height: 1.05;
  font-variant-numeric: tabular-nums;
  color: var(--grass-soft);
}

.page-about .eco__stat p {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.68;
  color: var(--ab-sub-dark);
}

.page-about .eco__notes {
  margin-top: 26px;
  display: grid;
  gap: 14px;
  max-width: 62em;
}

.page-about .eco__notes p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--ab-sub-dark);
  text-wrap: pretty;
}

@media (min-width: 820px) {
  .page-about .eco {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .eco__stat {
    padding: 24px 20px 26px;
  }
}

/* ---------- 06 理由列表 ---------- */

.page-about .reason-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.page-about .reason-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .reason {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "idx title"
    "idx text";
  gap: 4px 14px;
  padding: 18px;
  border: 1px solid var(--sand);
  border-radius: var(--r-md);
  background: var(--ab-card-cream);
  transition: border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .reason:hover {
  border-color: var(--grass);
  background: #ffffff;
}

.page-about .reason__idx {
  grid-area: idx;
  align-self: start;
  margin-top: 3px;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--grass);
}

.page-about .reason h3 {
  grid-area: title;
  margin: 0;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .reason p {
  grid-area: text;
  margin: 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--ab-sub-cream);
}

.page-about .reason__tail {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ab-sub-cream);
}

.page-about .reason__tail a {
  color: #1f7a45;
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 164, 95, 0.45);
}

.page-about .reason__tail a:hover {
  color: var(--grass);
}

@media (min-width: 760px) {
  .page-about .reason-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}

/* ---------- 07 下一步 ---------- */

.page-about .about-section--cta {
  border-bottom: none;
}

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

.page-about .cta-card {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "title go"
    "text go";
  align-items: center;
  gap: 8px 18px;
  padding: 24px 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(140deg, #1a2733 0%, #12100c 100%);
  color: var(--paper);
  text-decoration: none;
  transition: border-color 180ms var(--ease), transform 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .cta-card:hover {
  border-color: var(--grass);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.page-about .cta-card h3 {
  grid-area: title;
  margin: 0;
  font-size: 19px;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.page-about .cta-card p {
  grid-area: text;
  margin: 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--ab-sub-dark);
}

.page-about .cta-card__go {
  grid-area: go;
  font-size: 22px;
  color: var(--grass);
  transition: transform 180ms var(--ease);
}

.page-about .cta-card:hover .cta-card__go {
  transform: translateX(4px);
}

.page-about .cta-note {
  margin: 20px 0 0;
  font-size: 13px;
  color: var(--mist);
}

@media (min-width: 760px) {
  .page-about .cta-pair {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

/* ---------- 动效收敛 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .flow__step,
  .page-about .team-node,
  .page-about .cta-card,
  .page-about .cta-card__go,
  .page-about .about-lines li {
    transition: none;
  }

  .page-about .flow__step:hover,
  .page-about .team-node:hover,
  .page-about .cta-card:hover {
    transform: none;
  }

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