.page-about {
  --about-rail: 120px;
  --about-hair: rgba(126, 167, 155, 0.18);
  --about-mint-line: rgba(56, 242, 208, 0.22);
  color: var(--fog);
}

.page-about .breadcrumbs {
  padding: var(--space-3) var(--space-2) 0;
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: var(--space-5) var(--space-5);
  background:
    radial-gradient(110% 80% at 92% -10%, rgba(56, 242, 208, 0.16), transparent 62%),
    linear-gradient(152deg, #0B1F1A 0%, #07110E 54%, #052E2B 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -18%;
  right: -26%;
  width: min(680px, 120%);
  height: 460px;
  background: radial-gradient(closest-side, rgba(56, 242, 208, 0.2), transparent 72%);
  transform: rotate(-18deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--mint), rgba(56, 242, 208, 0) 58%, var(--amber));
  opacity: 0.75;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero h1 {
  margin: var(--space-2) 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 7.4vw, 4rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--fog);
  text-wrap: balance;
}

.page-about .about-hero .lead {
  margin-top: var(--space-3);
  max-width: 60ch;
  color: rgba(232, 243, 239, 0.8);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2) var(--space-3);
  margin-top: var(--space-5);
}

.page-about .hero-stats .stat {
  padding-top: var(--space-2);
  border-top: 1px solid var(--about-mint-line);
}

.page-about .hero-stats .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 5vw, 2.2rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--mint);
}

.page-about .hero-stats .stat-label {
  display: block;
  margin-top: 6px;
  font-size: 0.82rem;
  color: var(--slate);
}

/* 长卷骨架 */
.page-about .about-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  padding-block: var(--space-4) var(--space-6);
}

.page-about .flow-rail {
  display: none;
}

.page-about .flow-body {
  min-width: 0;
}

/* 章节 */
.page-about .about-section {
  padding-block: var(--space-5);
  border-top: 1px solid var(--about-hair);
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: var(--space-3);
}

.page-about .sec-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mint);
}

.page-about .sec-head h2 {
  margin: var(--space-2) 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 5vw, 2.4rem);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--fog);
  text-wrap: balance;
}

.page-about .sec-lead {
  margin: var(--space-2) 0 0;
  max-width: 62ch;
  color: rgba(232, 243, 239, 0.78);
}

.page-about .split-text p {
  margin: 0 0 var(--space-2);
  color: rgba(232, 243, 239, 0.82);
}

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

.page-about .split {
  margin-top: var(--space-4);
  display: grid;
  gap: var(--space-4);
  align-items: start;
}

.page-about .about-figure {
  margin: 0;
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-mint-line);
  background: var(--ink-700);
}

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

.page-about .about-figure .media-caption {
  margin: 0;
  padding: 10px var(--space-2) 12px;
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--slate);
  background: rgba(7, 17, 14, 0.6);
}

/* 整理准则 */
.page-about .standard-list {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.page-about .standard-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-2);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--about-hair);
  border-left: 3px solid var(--mint);
  background: linear-gradient(160deg, #12372E 0%, #0B1F1A 72%);
}

.page-about .std-num {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--mint);
  line-height: 1.5;
}

.page-about .standard-item h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--fog);
}

.page-about .standard-item p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.72;
  color: rgba(232, 243, 239, 0.78);
}

.page-about .pull-quote {
  margin: var(--space-4) 0 0;
  padding: var(--space-3) var(--space-3) var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid rgba(56, 242, 208, 0.28);
  border-left: 4px solid var(--amber);
  background: rgba(56, 242, 208, 0.06);
}

.page-about .pull-quote p {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.02rem, 3vw, 1.22rem);
  font-weight: 700;
  line-height: 1.6;
  color: var(--fog);
}

.page-about .pull-quote cite {
  display: block;
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--slate);
}

/* 团队 */
.page-about .filter-bar {
  margin-top: var(--space-4);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.page-about .team-grid {
  margin-top: var(--space-3);
}

.page-about .team-card {
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--about-hair);
  background: linear-gradient(170deg, #12372E 0%, #0B1F1A 70%);
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-start;
}

.page-about .team-card .card-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--fog);
}

.page-about .team-card .card-text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(232, 243, 239, 0.76);
}

.page-about .team-card.is-hidden {
  display: none;
}

.page-about .split--flip {
  margin-top: var(--space-4);
}

/* 版本长卷 */
.page-about .version-line {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0 0 0 var(--space-3);
  position: relative;
  display: grid;
  gap: var(--space-2);
}

.page-about .version-line::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--mint), var(--amber));
  opacity: 0.8;
}

.page-about .version-line > li {
  position: relative;
}

.page-about .version-line > li::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--space-3) + 5px);
  top: 22px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 3px rgba(7, 17, 14, 0.9), 0 0 0 4px rgba(56, 242, 208, 0.35);
}

.page-about .version-card {
  border-radius: var(--radius-md);
  border: 1px solid rgba(7, 17, 14, 0.22);
  background: var(--paper);
  color: var(--ink-900);
  padding: 0;
  overflow: hidden;
}

.page-about .version-card > summary {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 14px var(--space-3);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.98rem;
  color: #0B1F1A;
}

.page-about .version-card > summary::-webkit-details-marker {
  display: none;
}

.page-about .version-card > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: #0B1F1A;
  opacity: 0.68;
}

.page-about .version-card[open] > summary::after {
  content: "–";
}

.page-about .version-tag {
  flex: none;
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  background: #07110E;
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .version-title {
  min-width: 0;
}

.page-about .version-card .accordion-body {
  padding: 0 var(--space-3) 14px;
}

.page-about .version-card .accordion-body p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.74;
  color: #16342B;
}

.page-about .version-figure {
  margin-top: var(--space-4);
}

.page-about .versions-link {
  margin: var(--space-3) 0 0;
  font-size: 0.9rem;
  color: var(--slate);
}

.page-about .versions-link a {
  color: var(--mint);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 长期服务 */
.page-about .service-grid {
  margin-top: var(--space-4);
}

.page-about .service-card {
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--about-hair);
  border-top: 3px solid var(--amber);
  background: linear-gradient(165deg, #12372E 0%, #0B1F1A 78%);
}

.page-about .service-card .card-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--fog);
}

.page-about .service-card .card-text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: rgba(232, 243, 239, 0.78);
}

.page-about .help-strip {
  margin-top: var(--space-4);
  padding: var(--space-3);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(56, 242, 208, 0.26);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(245, 185, 76, 0.14), transparent 60%),
    linear-gradient(150deg, #0B1F1A, #07110E);
  display: grid;
  gap: var(--space-3);
}

.page-about .help-strip h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 4vw, 1.32rem);
  font-weight: 800;
  color: var(--fog);
}

.page-about .help-strip p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: rgba(232, 243, 239, 0.78);
}

.page-about .help-strip-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
}

.page-about .service-contact {
  margin: var(--space-3) 0 0;
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  color: var(--slate);
  word-break: break-word;
}

/* 平板 */
@media (min-width: 720px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .help-strip {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: var(--space-4);
  }
}

/* 桌面：左侧章节轨道 + 右侧错位内容 */
@media (min-width: 1000px) {
  .page-about .about-hero {
    padding-block: var(--space-6) var(--space-6);
  }

  .page-about .about-flow {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--space-5);
    padding-block: var(--space-5) var(--space-6);
  }

  .page-about .flow-rail {
    display: block;
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .flow-rail ol {
    list-style: none;
    margin: 0;
    padding: 0;
    position: relative;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
  }

  .page-about .flow-rail ol::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 6px;
    bottom: 6px;
    width: 1px;
    background: linear-gradient(180deg, var(--mint), rgba(56, 242, 208, 0.1));
  }

  .page-about .flow-rail li {
    position: relative;
    padding-left: 22px;
  }

  .page-about .flow-rail li::before {
    content: "";
    position: absolute;
    left: 1px;
    top: 5px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--ink-900);
    border: 1px solid rgba(56, 242, 208, 0.55);
  }

  .page-about .flow-rail a {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.76rem;
    line-height: 1.5;
    color: var(--slate);
    text-decoration: none;
  }

  .page-about .flow-rail a:hover,
  .page-about .flow-rail a:focus-visible {
    color: var(--mint);
  }

  .page-about .split {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: var(--space-5);
    align-items: center;
  }

  .page-about .split--flip > .split-text {
    order: 2;
  }

  .page-about .split--flip > .split-media {
    order: 1;
  }

  .page-about .split-media {
    margin-top: var(--space-3);
  }

  .page-about .version-line {
    padding-left: var(--space-4);
  }

  .page-about .version-line > li::before {
    left: calc(-1 * var(--space-4) + 5px);
  }

  .page-about .about-section {
    padding-block: var(--space-6);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .flow-rail a {
    transition: none;
  }
}
<<<END>>>