.page-about {
  background: var(--night);
  color: var(--fog);
  font-family: var(--font-body);
  padding-bottom: clamp(36px, 6vw, 80px);
  overflow-x: clip;
}

.page-about .about-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--cyan), var(--mint));
  z-index: 60;
  pointer-events: none;
}

/* 面包屑 */
.page-about .about-crumb-row {
  padding-top: clamp(14px, 2.4vw, 26px);
}

.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mint);
}

.page-about .about-crumbs li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-crumbs li + li::before {
  content: "/";
  color: var(--line);
}

.page-about .about-crumbs a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  border-bottom-color: var(--cyan);
  color: var(--cyan);
}

.page-about .about-crumbs [aria-current="page"] {
  color: var(--fog);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  margin-top: clamp(14px, 2.6vw, 26px);
  border-top: var(--edge);
  border-bottom: var(--edge);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(120% 90% at 88% 4%, rgba(34, 245, 200, 0.22), transparent 58%),
    radial-gradient(90% 80% at 0% 100%, rgba(255, 184, 77, 0.16), transparent 55%),
    repeating-linear-gradient(115deg, rgba(168, 255, 232, 0.07) 0 1px, transparent 1px 46px),
    linear-gradient(140deg, #0e3b33 0%, #07231f 62%);
}

.page-about .about-hero-grid {
  position: relative;
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding: clamp(28px, 5vw, 60px) 0 clamp(30px, 5vw, 64px);
}

.page-about .about-hero-copy {
  min-width: 0;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.9rem, 6.2vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--fog);
  text-wrap: balance;
}

.page-about .about-lead {
  margin: 18px 0 0;
  max-width: 48ch;
  font-size: clamp(0.98rem, 2vw, 1.08rem);
  line-height: 1.85;
  color: rgba(241, 247, 244, 0.86);
}

.page-about .about-hero-chips {
  margin-top: 20px;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-hero-media {
  margin: 0;
  position: relative;
  border: var(--edge);
  box-shadow: var(--shadow-hard);
  background: var(--panel-2);
  overflow: hidden;
}

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

/* 主体分栏 */
.page-about .about-layout {
  display: grid;
  gap: clamp(22px, 4vw, 48px);
  padding-top: clamp(26px, 4.6vw, 52px);
  align-items: start;
}

/* 目录 */
.page-about .about-toc {
  border: var(--edge);
  background: var(--panel-2);
  box-shadow: var(--shadow-soft);
  padding: 18px;
}

.page-about .about-toc-label {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-toc-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.page-about .about-toc-list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-height: 44px;
  padding: 10px 8px;
  border-top: 1px solid var(--line);
  color: rgba(241, 247, 244, 0.84);
  text-decoration: none;
  font-size: 0.92rem;
  line-height: 1.5;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-toc-list a:hover,
.page-about .about-toc-list a:focus-visible {
  color: var(--cyan);
  background: rgba(34, 245, 200, 0.08);
}

.page-about .about-toc-list a:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .about-toc-num {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-about .about-toc-btn {
  margin-top: 16px;
  width: 100%;
  justify-content: center;
}

/* 章节 */
.page-about .about-body {
  min-width: 0;
}

.page-about .about-sec {
  padding: clamp(26px, 4.4vw, 46px) 0;
  border-top: var(--edge);
}

.page-about .about-body > .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px 16px;
  align-items: baseline;
}

.page-about .about-sec-num {
  font-size: clamp(1.8rem, 5vw, 3.2rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: rgba(34, 245, 200, 0.22);
  -webkit-text-stroke: 1px rgba(34, 245, 200, 0.65);
}

.page-about .about-sec h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.35rem, 3.4vw, 2rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--fog);
}

.page-about .about-sec p {
  margin: 14px 0 0;
  max-width: 64ch;
  line-height: 1.85;
  color: rgba(241, 247, 244, 0.84);
}

.page-about .about-sec-lead {
  color: var(--mint) !important;
  font-size: 1.04rem;
  border-left: 4px solid var(--cyan);
  padding-left: 14px;
}

.page-about .about-sec strong.mono {
  color: var(--amber);
  font-weight: 600;
}

.page-about .about-inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 245, 200, 0.45);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  border-bottom-color: var(--cyan);
  background: rgba(34, 245, 200, 0.1);
}

/* 首章数据 */
.page-about .about-facts {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-facts li {
  border: var(--edge);
  background: var(--panel);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-fact-num {
  font-size: clamp(1.25rem, 3vw, 1.6rem);
  color: var(--amber);
  letter-spacing: -0.02em;
}

.page-about .about-fact-label {
  font-size: 0.88rem;
  line-height: 1.6;
  color: rgba(241, 247, 244, 0.78);
}

/* 标签说明 */
.page-about .about-map {
  display: grid;
  gap: 12px;
  margin: 20px 0 0;
}

.page-about .about-map-item {
  border: var(--edge);
  background: var(--panel-2);
  padding: 14px 16px;
}

.page-about .about-map-item .tag {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink);
  background: var(--mint);
  padding: 3px 8px;
  border: 1px solid var(--cyan);
}

.page-about .about-map-item p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: rgba(241, 247, 244, 0.8);
}

/* 引文 */
.page-about .about-quote {
  margin: 24px 0 0;
  border-left: 6px solid var(--coral);
  background: linear-gradient(115deg, rgba(14, 59, 51, 0.95), rgba(10, 44, 39, 0.7));
  padding: 16px 18px;
  font-size: 0.98rem;
  line-height: 1.85;
  color: rgba(241, 247, 244, 0.9);
}

/* 版本切换 */
.page-about .about-versions {
  margin-top: 22px;
  border: var(--edge);
  background: var(--panel-2);
  box-shadow: var(--shadow-soft);
}

.page-about .about-versions .tablist {
  display: flex;
  flex-wrap: wrap;
  border-bottom: var(--edge);
}

.page-about .about-versions .tab {
  flex: 1 1 auto;
  min-height: 48px;
  padding: 12px 14px;
  border: 0;
  border-right: 1px solid var(--line);
  background: transparent;
  color: var(--mint);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-versions .tab:last-child {
  border-right: 0;
}

.page-about .about-versions .tab:hover {
  background: rgba(34, 245, 200, 0.1);
  color: var(--cyan);
}

.page-about .about-versions .tab:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: -3px;
}

.page-about .about-versions .tab[aria-selected="true"] {
  background: var(--cyan);
  color: var(--ink);
  font-weight: 700;
}

.page-about .about-versions .tabpanel {
  padding: 18px;
  animation: about-fade var(--dur) var(--ease) both;
}

.page-about .about-versions .tabpanel[hidden] {
  display: none;
}

.page-about .about-versions h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.08rem;
  letter-spacing: 0.01em;
  color: var(--fog);
}

.page-about .about-versions .tabpanel p {
  margin: 10px 0 0;
  max-width: 60ch;
  line-height: 1.8;
  color: rgba(241, 247, 244, 0.82);
}

.page-about .about-panel-note {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--amber) !important;
}

@keyframes about-fade {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 图注 */
.page-about .about-figure {
  margin: 24px 0 0;
  border: var(--edge);
  background: var(--panel);
  overflow: hidden;
}

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

.page-about .about-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  line-height: 1.7;
  color: var(--mint);
}

/* 团队 */
.page-about .about-team {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
  margin-top: 20px;
}

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

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

.page-about .about-audit {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: audit;
  display: grid;
  gap: 10px;
}

.page-about .about-audit li {
  position: relative;
  border: var(--edge);
  background: var(--panel);
  padding: 14px 16px 14px 56px;
  line-height: 1.72;
  font-size: 0.94rem;
  color: rgba(241, 247, 244, 0.84);
}

.page-about .about-audit li::before {
  counter-increment: audit;
  content: "0" counter(audit);
  position: absolute;
  left: 14px;
  top: 15px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--amber);
  letter-spacing: 0.06em;
}

.page-about .about-audit strong {
  color: var(--fog);
  font-weight: 700;
}

.page-about .about-team-note {
  font-size: 0.9rem;
  color: rgba(168, 255, 232, 0.82) !important;
  border-left: 4px solid var(--coral);
  padding-left: 12px;
}

/* 服务节奏 */
.page-about .about-stat-grid {
  display: grid;
  gap: 12px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stat {
  border: var(--edge);
  background: linear-gradient(150deg, rgba(14, 59, 51, 0.96), rgba(10, 44, 39, 0.85));
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-stat-num {
  font-size: clamp(1.4rem, 3.4vw, 1.85rem);
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .about-stat-label {
  font-size: 0.86rem;
  line-height: 1.6;
  color: rgba(241, 247, 244, 0.76);
}

/* 下一步 */
.page-about .about-next {
  display: grid;
  gap: 12px;
  margin-top: clamp(30px, 5vw, 54px);
  padding-top: clamp(24px, 4vw, 38px);
  border-top: var(--edge);
}

.page-about .about-next-title {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mint);
  text-transform: uppercase;
}

.page-about .about-next a {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border: var(--edge);
  background: var(--panel);
  padding: 18px;
  color: var(--fog);
  text-decoration: none;
  box-shadow: var(--shadow-soft);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
    background var(--dur) var(--ease);
}

.page-about .about-next a:hover,
.page-about .about-next a:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard);
  background: var(--panel-2);
}

.page-about .about-next a:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .about-next-kicker {
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-next-text {
  font-size: 0.98rem;
  line-height: 1.6;
}

/* 媒体查询：平板与桌面 */
@media (min-width: 640px) {
  .page-about .about-facts,
  .page-about .about-map {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-next {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

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

  .page-about .about-hero-media {
    clip-path: polygon(0 0, 100% 0, 100% 86%, 8% 100%);
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }

  .page-about .about-team .about-figure img {
    aspect-ratio: 10 / 7;
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 258px) minmax(0, 1fr);
  }

  .page-about .about-toc {
    position: sticky;
    top: 24px;
  }

  .page-about .about-stat-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-versions .tabpanel {
    animation: none;
  }

  .page-about .about-next a {
    transition: none;
  }
}
<<<END>>>