.page-about {
  --about-rail: 158px;
  --about-line: rgba(216, 163, 60, .3);
  --about-dark-line: rgba(233, 238, 245, .14);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(30px, 5.5vw, 78px) clamp(40px, 6vw, 76px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(860px 420px at 8% -12%, rgba(196, 64, 46, .18), transparent 62%),
    radial-gradient(700px 380px at 92% 4%, rgba(47, 143, 124, .14), transparent 66%);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
  align-items: end;
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 76px);
  }
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(29px, 5.2vw, 58px);
  line-height: 1.16;
  letter-spacing: .01em;
  color: var(--snow);
  margin: .34em 0 .5em;
  max-width: 20ch;
}

.page-about .about-hero h1::after {
  content: "";
  display: block;
  width: 104px;
  height: 2px;
  margin-top: .5em;
  background: linear-gradient(90deg, var(--gold), rgba(216, 163, 60, 0));
}

.page-about .about-hero .lede {
  max-width: 60ch;
  color: var(--muted);
}

.page-about .about-hero__panel {
  border: 1px solid var(--about-dark-line);
  background: linear-gradient(160deg, rgba(18, 41, 74, .94), rgba(10, 26, 47, .94));
  box-shadow: var(--shadow-1);
  padding: clamp(18px, 2.4vw, 28px);
}

.page-about .about-hero__panel-title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--gold);
}

.page-about .hero-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .hero-stats li {
  padding: 15px 0 13px;
  border-top: 1px solid var(--about-dark-line);
}

.page-about .hero-stats li:nth-child(even) {
  padding-left: clamp(14px, 2vw, 20px);
  border-left: 1px solid var(--about-dark-line);
}

.page-about .hero-stats .num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(23px, 2.9vw, 32px);
  line-height: 1.05;
  color: var(--gold);
  letter-spacing: -.01em;
}

.page-about .hero-stats__unit {
  font-size: .46em;
  margin-left: 2px;
  color: var(--slate);
}

.page-about .hero-stats__label {
  display: block;
  margin-top: 7px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--slate);
}

/* ---------- 发展历程 ---------- */
.page-about .origin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 48px);
  margin-top: clamp(28px, 4vw, 52px);
}

@media (min-width: 900px) {
  .page-about .origin-grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }
}

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

.page-about .year-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .year-rail__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 10px 14px;
  border: 1px solid var(--about-dark-line);
  border-radius: var(--radius);
  color: var(--slate);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .year-rail__link:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

.page-about .year-rail__year {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .05em;
}

.page-about .year-rail__label {
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--slate);
}

@media (min-width: 900px) {
  .page-about .year-rail {
    position: sticky;
    top: 132px;
  }

  .page-about .year-rail__list {
    display: block;
    overflow: visible;
  }

  .page-about .year-rail__link {
    position: relative;
    padding: 15px 10px 15px 26px;
    border: 0;
    border-radius: 0;
    background: transparent;
  }

  .page-about .year-rail__link::after {
    content: "";
    position: absolute;
    left: 5px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--about-dark-line);
  }

  .page-about .year-rail__link::before {
    content: "";
    position: absolute;
    left: 2px;
    top: 50%;
    z-index: 1;
    width: 7px;
    height: 7px;
    transform: translateY(-50%) rotate(45deg);
    background: var(--ink);
    border: 1px solid var(--about-line);
    transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
  }

  .page-about .year-rail__link:hover,
  .page-about .year-rail__link[aria-current="true"] {
    color: var(--paper);
    background: linear-gradient(90deg, rgba(216, 163, 60, .14), rgba(216, 163, 60, 0) 80%);
  }

  .page-about .year-rail__link:hover::before,
  .page-about .year-rail__link[aria-current="true"]::before {
    background: var(--gold);
    border-color: var(--gold);
  }
}

.page-about .origin-track {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
}

.page-about .origin-node {
  position: relative;
  border-left: 1px solid var(--about-dark-line);
  padding-left: clamp(18px, 2.6vw, 34px);
  scroll-margin-top: 150px;
}

.page-about .origin-node::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 8px;
  width: 7px;
  height: 7px;
  transform: rotate(45deg);
  background: var(--ink);
  border: 1px solid var(--gold);
}

.page-about .origin-node__year {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .24em;
  color: var(--gold);
}

.page-about .origin-node h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.1vw, 25px);
  line-height: 1.35;
  color: var(--snow);
}

.page-about .origin-node p:last-child {
  margin: 0;
  max-width: 66ch;
  color: var(--muted);
}

/* ---------- 版本追踪 ---------- */
.page-about .about-track__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 54px);
  align-items: center;
}

@media (min-width: 960px) {
  .page-about .about-track__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
  }
}

.page-about .about-track__body h2 {
  margin: .2em 0 .7em;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.22;
  color: var(--snow);
}

.page-about .about-track__body > p {
  max-width: 58ch;
  color: var(--muted);
}

.page-about .track-list {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-dark-line);
}

.page-about .track-list li {
  position: relative;
  padding: 15px 0 15px 28px;
  border-bottom: 1px solid var(--about-dark-line);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .track-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 24px;
  width: 12px;
  height: 1px;
  background: var(--gold);
}

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

/* ---------- 团队 ---------- */
.page-about .about-team__figure {
  margin: clamp(26px, 4vw, 44px) 0 0;
}

.page-about .team-grid {
  list-style: none;
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 22px);
}

@media (min-width: 700px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

.page-about .team-card {
  position: relative;
  padding: clamp(18px, 2.2vw, 26px);
  background: linear-gradient(165deg, rgba(18, 41, 74, .9), rgba(14, 32, 56, .9));
  border: 1px solid var(--about-dark-line);
  border-top: 2px solid var(--clay);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .team-card:nth-child(2) { border-top-color: var(--turquoise); }
.page-about .team-card:nth-child(3) { border-top-color: var(--gold); }
.page-about .team-card:nth-child(4) { border-top-color: var(--moss); }

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  transform: translateY(-3px);
  box-shadow: var(--shadow-1);
  border-color: var(--about-line);
}

.page-about .team-card h3 {
  margin: 0 0 9px;
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: .03em;
  color: var(--snow);
}

.page-about .team-card h3::before {
  content: "「";
  margin-right: 1px;
  color: var(--gold);
  font-family: var(--font-display);
}

.page-about .team-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--slate);
  transition: color var(--dur) var(--ease);
}

.page-about .team-card:hover p,
.page-about .team-card:focus-within p {
  color: var(--muted);
}

.page-about .support-note {
  margin-top: clamp(20px, 3vw, 32px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 28px);
  align-items: center;
  padding: clamp(18px, 2.4vw, 28px);
  border: 1px dashed var(--about-line);
  background: rgba(216, 163, 60, .05);
}

@media (min-width: 780px) {
  .page-about .support-note {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: clamp(24px, 4vw, 56px);
  }
}

.page-about .support-note__text {
  margin: 0;
  max-width: 62ch;
  color: var(--muted);
}

.page-about .support-note__nums {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(20px, 3vw, 36px);
}

.page-about .support-note__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1;
  color: var(--gold);
}

.page-about .support-note__label {
  display: block;
  margin-top: 7px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--slate);
}

/* ---------- 合作生态 ---------- */
.page-about .partners-media {
  position: relative;
  margin-top: clamp(24px, 3.4vw, 40px);
  overflow: hidden;
  border: 1px solid var(--about-dark-line);
}

.page-about .partners-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  opacity: .8;
}

.page-about .partners-media__caption {
  position: absolute;
  inset: auto 0 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: clamp(16px, 4vw, 42px);
  padding: clamp(16px, 2.2vw, 26px);
  background: linear-gradient(to top, rgba(10, 26, 47, .96), rgba(10, 26, 47, .08));
}

.page-about .partners-media__caption p {
  margin: 0;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .partners-media__caption .num {
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--gold);
  margin-right: 3px;
}

.page-about .ecosystem-list {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-dark-line);
}

@media (min-width: 800px) {
  .page-about .ecosystem-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .ecosystem-node {
  position: relative;
  padding: clamp(18px, 2.2vw, 26px) clamp(18px, 2.4vw, 30px);
  background: var(--ink);
  transition: background var(--dur) var(--ease);
}

.page-about .ecosystem-node::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 2px;
  height: 0;
  background: var(--gold);
  transition: height var(--dur) var(--ease);
}

.page-about .ecosystem-node:hover,
.page-about .ecosystem-node:focus-within {
  background: rgba(18, 41, 74, .88);
}

.page-about .ecosystem-node:hover::after,
.page-about .ecosystem-node:focus-within::after {
  height: 100%;
}

.page-about .ecosystem-node h3 {
  margin: 0 0 9px;
  font-family: var(--font-display);
  font-size: 17px;
  letter-spacing: .04em;
  color: var(--snow);
}

.page-about .ecosystem-node p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--slate);
  transition: color var(--dur) var(--ease);
}

.page-about .ecosystem-node:hover p,
.page-about .ecosystem-node:focus-within p {
  color: var(--muted);
}

/* ---------- 长期跟踪（米白纸区） ---------- */
.page-about .about-watch {
  color: var(--ink);
}

.page-about .about-watch .eyebrow {
  color: var(--cinnabar-deep);
}

.page-about .about-watch h2,
.page-about .about-watch h3 {
  color: var(--ink);
}

.page-about .about-watch .section__head h2 {
  font-family: var(--font-display);
  font-size: clamp(23px, 3.2vw, 38px);
  line-height: 1.22;
}

.page-about .about-watch .lede,
.page-about .about-watch .section__head p {
  color: var(--ink-soft);
}

.page-about .watch-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 30px);
  margin-top: clamp(24px, 3.4vw, 40px);
}

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

.page-about .watch-item {
  padding-top: 20px;
  border-top: 3px solid var(--clay);
}

.page-about .watch-item:nth-child(2) { border-top-color: var(--turquoise); }
.page-about .watch-item:nth-child(3) { border-top-color: var(--gold); }

.page-about .watch-item__cycle {
  display: inline-block;
  margin-bottom: 11px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cinnabar-deep);
}

.page-about .watch-item h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
}

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

.page-about .watch-legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: clamp(12px, 2.2vw, 26px);
  margin-top: clamp(26px, 3.6vw, 42px);
  padding-top: clamp(18px, 2.4vw, 26px);
  border-top: 1px solid rgba(10, 26, 47, .16);
}

.page-about .watch-legend p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .watch-legend__lead {
  font-weight: 700;
  color: var(--ink) !important;
  letter-spacing: .04em;
}

.page-about .watch-link {
  margin: clamp(20px, 2.8vw, 30px) 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .watch-link a {
  color: var(--cinnabar-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--dur) var(--ease);
}

.page-about .watch-link a:hover,
.page-about .watch-link a:focus-visible {
  color: var(--ink);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  position: relative;
  overflow: hidden;
  padding-block: clamp(44px, 6vw, 88px);
}

.page-about .about-next::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(118deg, rgba(196, 64, 46, .2), rgba(47, 143, 124, .12) 55%, rgba(10, 26, 47, 0) 86%);
}

.page-about .about-next__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 46px);
  align-items: center;
}

@media (min-width: 900px) {
  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1.4fr) auto;
  }
}

.page-about .about-next h2 {
  margin: .2em 0 .6em;
  font-family: var(--font-display);
  font-size: clamp(23px, 3.2vw, 38px);
  line-height: 1.24;
  color: var(--snow);
}

.page-about .about-next .lede {
  max-width: 62ch;
  color: var(--muted);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (max-width: 899px) {
  .page-about .about-next__actions .btn {
    flex: 1 1 auto;
    justify-content: center;
  }
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 480px) {
  .page-about .partners-media__caption {
    position: static;
    background: rgba(14, 32, 56, .96);
  }

  .page-about .partners-media img {
    aspect-ratio: 4 / 3;
  }
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .ecosystem-node,
  .page-about .ecosystem-node::after,
  .page-about .year-rail__link {
    transition: none;
  }
}
</main>