.page-about {
  --about-r: 22px;
  --about-cut: 20px;
  background: var(--c-cloud);
  color: var(--c-ink);
  overflow-x: clip;
}

.page-about section[id] {
  scroll-margin-top: 140px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(96px, 13vw, 150px) 0 clamp(72px, 9vw, 118px);
  background:
    radial-gradient(120% 88% at 10% -6%, rgba(10, 132, 255, .34), transparent 62%),
    radial-gradient(90% 76% at 94% 12%, rgba(0, 229, 208, .16), transparent 60%),
    linear-gradient(178deg, var(--c-deep) 0%, var(--c-deep-2) 100%);
  color: var(--c-cloud);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .045) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(90% 70% at 30% 10%, #000 0%, transparent 78%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(32px, 6vw, 56px);
  grid-template-columns: 1fr;
}

.page-about .about-hero-copy .breadcrumbs {
  margin-bottom: 22px;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: .82rem;
  letter-spacing: .02em;
}

.page-about .breadcrumb-link {
  color: rgba(244, 246, 249, .68);
  text-decoration: none;
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--c-cyan);
}

.page-about .breadcrumb-sep {
  color: rgba(244, 246, 249, .34);
}

.page-about .breadcrumb-current {
  color: var(--c-cloud);
}

.page-about .about-hero-eyebrow {
  color: var(--c-cyan);
  font-family: var(--font-mono);
  letter-spacing: .12em;
  text-transform: uppercase;
}

.page-about .about-hero-title {
  margin: 14px 0 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(2.3rem, 7.4vw, 4.6rem);
  line-height: 1.03;
  letter-spacing: -.025em;
  color: var(--c-cloud);
}

.page-about .about-hero-title br {
  display: none;
}

.page-about .about-hero-lead {
  margin-top: 22px;
  max-width: 44ch;
  color: rgba(244, 246, 249, .82);
  font-size: 17px;
  line-height: 1.8;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

/* 玻璃索引卡 */
.page-about .about-hero-index {
  position: relative;
  padding: 24px 22px 22px;
  border: 1px solid var(--glass-line);
  border-radius: var(--r-lg);
  background: var(--glass-dark);
  backdrop-filter: blur(14px);
  box-shadow: var(--sh-float);
}

.page-about .about-hero-index::before {
  content: "";
  position: absolute;
  top: 0;
  left: 22px;
  right: 22px;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: linear-gradient(90deg, var(--c-blue), var(--c-cyan) 52%, var(--c-orange));
}

.page-about .about-index-title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: rgba(244, 246, 249, .58);
}

.page-about .about-stat-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 12px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 12px;
  border-left: 2px solid rgba(10, 132, 255, .55);
}

.page-about .about-stat:nth-child(2) {
  border-left-color: rgba(0, 229, 208, .55);
}

.page-about .about-stat:nth-child(3) {
  border-left-color: rgba(255, 107, 26, .6);
}

.page-about .about-stat:nth-child(4) {
  border-left-color: rgba(255, 217, 192, .6);
}

.page-about .about-stat-value {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(1.5rem, 4.4vw, 1.9rem);
  line-height: 1;
  color: var(--c-cloud);
}

.page-about .about-stat-value em {
  font-style: normal;
  font-size: .5em;
  margin-left: 2px;
  color: var(--c-cyan);
}

.page-about .about-stat-label {
  font-size: .8rem;
  color: rgba(244, 246, 249, .6);
}

.page-about .about-index-foot {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--glass-line-soft);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.page-about .about-index-note {
  margin: 0;
  font-size: .78rem;
  color: rgba(244, 246, 249, .58);
}

.page-about .about-hero-slant {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: clamp(34px, 5vw, 62px);
  background: var(--c-cloud);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
}

/* ---------- 章节跳转 ---------- */
.page-about .about-jump {
  position: sticky;
  top: calc(var(--header-h, 64px) + 10px);
  z-index: 20;
  margin-top: -26px;
}

.page-about .about-jump-inner {
  display: flex;
}

.page-about .about-jump-list {
  display: flex;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 7px;
  width: 100%;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
  border: 1px solid rgba(42, 48, 59, .12);
  border-radius: var(--r-pill);
  background: rgba(255, 255, 255, .9);
  backdrop-filter: blur(12px);
  box-shadow: 0 18px 40px -32px rgba(14, 17, 22, .7);
}

.page-about .about-jump-list::-webkit-scrollbar {
  display: none;
}

.page-about .about-jump-link {
  display: block;
  white-space: nowrap;
  padding: 9px 16px;
  border-radius: var(--r-pill);
  font-size: .87rem;
  font-weight: 500;
  color: var(--c-stone);
  text-decoration: none;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-jump-link:hover,
.page-about .about-jump-link:focus-visible {
  background: rgba(10, 132, 255, .1);
  color: var(--c-blue-deep);
}

/* ---------- 起点与定位 ---------- */
.page-about .about-origin {
  background: var(--c-cloud);
}

.page-about .about-origin-grid {
  display: grid;
  gap: clamp(28px, 5vw, 52px);
  grid-template-columns: 1fr;
  align-items: start;
}

.page-about .about-origin-figure {
  margin: 0;
  position: relative;
  border-radius: var(--c-card);
  overflow: hidden;
  background: linear-gradient(150deg, var(--c-deep) 0%, #101827 100%);
  border: 1px solid rgba(42, 48, 59, .14);
  box-shadow: var(--sh-card);
}

.page-about .about-origin-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 14 / 9;
}

.page-about .about-origin-figure .media-caption {
  display: block;
  padding: 12px 16px;
  font-size: .8rem;
  color: rgba(244, 246, 249, .68);
  background: rgba(20, 24, 33, .92);
  border-top: 1px solid var(--c-line);
}

.page-about .about-origin-lead {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--c-ink);
}

.page-about .about-origin-body p {
  color: var(--c-stone);
  line-height: 1.85;
}

.page-about .about-origin-quote {
  margin: 26px 0 22px;
  padding: 4px 0 4px 18px;
  border-left: 4px solid var(--c-orange);
}

.page-about .about-origin-quote p {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .95rem;
  line-height: 1.85;
  color: var(--c-ink);
}

.page-about .about-origin-quote-src {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--c-stone);
}

.page-about .about-origin-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-origin-tags .tag {
  border: 1px solid rgba(10, 132, 255, .28);
  background: rgba(10, 132, 255, .07);
  color: var(--c-blue-deep);
}

/* ---------- 四维评估 ---------- */
.page-about .about-guide {
  background: linear-gradient(180deg, var(--c-deep) 0%, var(--c-deep-2) 100%);
}

.page-about .about-guide-head .section-desc {
  color: rgba(244, 246, 249, .74);
}

.page-about .about-guide-head .section-title {
  color: var(--c-cloud);
}

.page-about .about-guide-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
  margin-top: clamp(30px, 5vw, 46px);
}

.page-about .about-guide-card {
  --g-accent: var(--c-blue);
  position: relative;
  padding: 22px 20px;
  background: var(--c-card);
  color: var(--c-ink);
  border-radius: var(--r-md);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-guide-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 62px;
  height: 4px;
  background: var(--g-accent);
}

.page-about .about-guide-card--cyan {
  --g-accent: var(--c-cyan);
}

.page-about .about-guide-card--orange {
  --g-accent: var(--c-orange);
}

.page-about .about-guide-card--peach {
  --g-accent: var(--c-orange-deep);
}

@media (hover: hover) {
  .page-about .about-guide-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 22px 46px -30px rgba(0, 0, 0, .85);
  }
}

.page-about .about-guide-summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  cursor: pointer;
  list-style: none;
  outline: none;
}

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

.page-about .about-guide-summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.2rem;
  line-height: 1;
  color: var(--c-stone);
  transition: transform var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-guide-card[open] .about-guide-summary::after {
  content: "−";
  color: var(--g-accent);
}

.page-about .about-guide-summary:focus-visible {
  outline: 2px solid var(--c-blue);
  outline-offset: 4px;
  border-radius: var(--r-xs);
}

.page-about .about-guide-index {
  font-family: var(--font-mono);
  font-size: .82rem;
  color: var(--g-accent);
  letter-spacing: .08em;
}

.page-about .about-guide-name {
  font-size: 1.24rem;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--c-ink);
}

.page-about .about-guide-body {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed rgba(42, 48, 59, .22);
}

.page-about .about-guide-check {
  margin: 0 0 8px;
  font-weight: 500;
  color: var(--c-ink);
  line-height: 1.7;
}

.page-about .about-guide-body p:last-child {
  margin: 0;
  font-size: .93rem;
  line-height: 1.85;
  color: var(--c-stone);
}

.page-about .about-guide-foot {
  margin-top: 30px;
  font-size: .95rem;
  color: rgba(244, 246, 249, .78);
}

.page-about .about-guide-foot .link-arrow {
  color: var(--c-cyan);
}

/* ---------- 改版脉络 ---------- */
.page-about .about-timeline {
  background: var(--c-cloud);
}

.page-about .about-timeline-head {
  display: grid;
  gap: 20px;
  grid-template-columns: 1fr;
  align-items: end;
}

.page-about .about-timeline-intro {
  margin: 0;
  color: var(--c-stone);
  line-height: 1.85;
}

.page-about .about-timeline-figure {
  margin: clamp(28px, 5vw, 44px) 0 0;
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid rgba(42, 48, 59, .14);
  background: linear-gradient(140deg, #0d1522 0%, #16202f 100%);
  box-shadow: var(--sh-card);
}

.page-about .about-timeline-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .about-timeline-figure .media-caption {
  display: block;
  padding: 12px 16px;
  font-size: .8rem;
  color: rgba(244, 246, 249, .68);
  background: rgba(20, 24, 33, .9);
  border-top: 1px solid var(--c-line);
}

.page-about .about-track {
  position: relative;
  list-style: none;
  margin: clamp(34px, 6vw, 54px) 0 0;
  padding: 0;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-blue) 0%, var(--c-cyan) 52%, var(--c-orange) 100%);
  border-radius: 2px;
}

.page-about .about-track-item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 0 0 30px 32px;
}

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

.page-about .about-track-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-card);
  border: 2px solid var(--c-blue);
}

.page-about .about-track-item--major::before {
  left: -3px;
  top: 3px;
  width: 18px;
  height: 18px;
  border-width: 3px;
  border-color: var(--c-orange);
  box-shadow: 0 0 0 5px rgba(255, 107, 26, .14);
}

.page-about .about-track-year {
  font-family: var(--font-mono);
  font-size: .84rem;
  letter-spacing: .1em;
  color: var(--c-blue-deep);
}

.page-about .about-track-item--major .about-track-year {
  color: var(--c-orange-deep);
}

.page-about .about-track-body h3 {
  margin: 0 0 6px;
  font-size: 1.14rem;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--c-ink);
}

.page-about .about-track-body p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--c-stone);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background:
    radial-gradient(80% 60% at 88% 0%, rgba(10, 132, 255, .18), transparent 60%),
    var(--c-deep);
}

.page-about .about-team-head .section-title {
  color: var(--c-cloud);
}

.page-about .about-team-head .section-desc {
  color: rgba(244, 246, 249, .74);
}

.page-about .about-team-grid {
  display: grid;
  gap: clamp(26px, 5vw, 48px);
  grid-template-columns: 1fr;
  margin-top: clamp(28px, 5vw, 44px);
  align-items: start;
}

.page-about .about-team-cards {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

.page-about .about-team-card {
  padding: 20px 20px 22px;
  border: 1px solid var(--glass-line);
  border-left: 3px solid var(--c-blue);
  border-radius: var(--r-sm);
  background: rgba(255, 255, 255, .035);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-team-card:nth-child(2) {
  border-left-color: var(--c-cyan);
}

.page-about .about-team-card:nth-child(3) {
  border-left-color: var(--c-orange);
}

@media (hover: hover) {
  .page-about .about-team-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, .28);
    border-left-color: var(--c-orange);
  }
}

.page-about .about-team-num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 5vw, 2.1rem);
  line-height: 1;
  color: var(--c-cloud);
}

.page-about .about-team-num em {
  font-style: normal;
  font-size: .46em;
  color: rgba(244, 246, 249, .6);
}

.page-about .about-team-card .card-title {
  margin: 0 0 8px;
  color: var(--c-cloud);
}

.page-about .about-team-card .card-text {
  margin: 0;
  font-size: .93rem;
  line-height: 1.8;
  color: rgba(244, 246, 249, .72);
}

.page-about .about-team-figure {
  margin: 0;
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--glass-line);
  background: rgba(20, 24, 33, .8);
}

.page-about .about-team-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 1 / 1;
}

.page-about .about-team-figure .media-caption {
  display: block;
  padding: 12px 16px;
  font-size: .8rem;
  color: rgba(244, 246, 249, .68);
  border-top: 1px solid var(--glass-line-soft);
}

/* ---------- 合作生态 ---------- */
.page-about .about-ecosystem {
  background: var(--c-cloud);
}

.page-about .about-eco-head .section-desc {
  color: var(--c-stone);
}

.page-about .about-eco-rail-wrap {
  margin-top: clamp(28px, 5vw, 42px);
  margin-inline: calc(-1 * clamp(20px, 5vw, 56px));
  padding-inline: clamp(20px, 5vw, 56px);
}

.page-about .about-eco-rail {
  gap: 16px;
}

.page-about .about-eco-card {
  flex: 0 0 84%;
  max-width: 340px;
  padding: 22px 20px;
  border: 1px solid rgba(42, 48, 59, .14);
  border-radius: var(--r-md);
  background: var(--c-card);
  box-shadow: var(--sh-card);
}

.page-about .about-eco-figure {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 6vw, 2.6rem);
  line-height: 1;
  color: var(--c-blue);
}

.page-about .about-eco-unit {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--c-stone);
}

.page-about .about-eco-card:nth-child(2) .about-eco-figure {
  color: #009e91;
}

.page-about .about-eco-card:nth-child(3) .about-eco-figure {
  color: var(--c-orange-deep);
}

.page-about .about-eco-card:nth-child(4) .about-eco-figure {
  color: var(--c-ink);
}

.page-about .about-eco-card p {
  margin: 14px 0 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--c-stone);
}

.page-about .about-eco-note {
  margin-top: 26px;
  font-size: .95rem;
  color: var(--c-stone);
}

.page-about .about-eco-note .link-arrow {
  color: var(--c-blue-deep);
}

/* ---------- 长期维护 ---------- */
.page-about .about-commit {
  background:
    radial-gradient(70% 70% at 8% 100%, rgba(255, 107, 26, .2), transparent 62%),
    linear-gradient(180deg, var(--c-deep-2) 0%, var(--c-deep) 100%);
}

.page-about .about-commit-grid {
  display: grid;
  gap: clamp(28px, 5vw, 52px);
  grid-template-columns: 1fr;
  align-items: start;
}

.page-about .about-commit-copy .section-title {
  color: var(--c-cloud);
}

.page-about .about-commit-copy p {
  color: rgba(244, 246, 249, .78);
  line-height: 1.85;
  max-width: 46ch;
}

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

.page-about .about-commit-panel {
  padding: 24px 22px;
  border: 1px solid var(--glass-line);
  border-radius: var(--r-lg);
  background: rgba(255, 255, 255, .04);
  backdrop-filter: blur(10px);
}

.page-about .about-commit-panel-title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: rgba(244, 246, 249, .56);
}

.page-about .about-commit-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-commit-list li {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 6px 16px;
  padding: 11px 0;
  border-bottom: 1px solid var(--glass-line-soft);
}

.page-about .about-commit-key {
  font-size: .86rem;
  color: rgba(244, 246, 249, .6);
}

.page-about .about-commit-val {
  font-family: var(--font-mono);
  font-size: .88rem;
  color: var(--c-cloud);
  text-align: right;
}

.page-about .about-commit-contact {
  margin: 20px 0 0;
  font-family: var(--font-mono);
  font-size: .84rem;
  color: var(--c-cyan);
  word-break: break-word;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero-title br {
    display: inline;
  }

  .page-about .about-hero-index {
    padding: 28px 26px 24px;
  }

  .page-about .about-guide-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .about-guide-card:nth-child(1) {
    transform: rotate(-.7deg);
  }

  .page-about .about-guide-card:nth-child(2) {
    transform: rotate(.5deg);
  }

  .page-about .about-guide-card:nth-child(3) {
    transform: rotate(.6deg);
  }

  .page-about .about-guide-card:nth-child(4) {
    transform: rotate(-.5deg);
  }

  .page-about .about-eco-card {
    flex: 0 0 46%;
  }

  .page-about .about-team-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-track-item {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 24px;
    padding-left: 40px;
  }

  .page-about .about-track-year {
    padding-top: 2px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 62fr) minmax(0, 38fr);
    align-items: start;
    gap: clamp(36px, 5vw, 64px);
  }

  .page-about .about-jump {
    margin-top: -30px;
  }

  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 52fr) minmax(0, 48fr);
    gap: clamp(36px, 4.5vw, 60px);
  }

  .page-about .about-timeline-head {
    grid-template-columns: minmax(0, 58fr) minmax(0, 42fr);
    gap: clamp(30px, 5vw, 64px);
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 58fr) minmax(0, 42fr);
  }

  .page-about .about-team-cards {
    grid-template-columns: 1fr;
  }

  .page-about .about-eco-card {
    flex: 0 0 30%;
  }

  .page-about .about-commit-grid {
    grid-template-columns: minmax(0, 56fr) minmax(0, 44fr);
  }
}

@media (min-width: 1240px) {
  .page-about .about-eco-card {
    flex: 0 0 27%;
  }
}
</PAGE_CSS>>>