.page-about {
  --about-line: rgba(56, 224, 208, .22);
  --about-soft: rgba(56, 224, 208, .1);
  padding-bottom: clamp(40px, 6vw, 88px);
}

/* 首屏 */
.page-about .about-intro {
  padding: clamp(26px, 5vw, 52px) 0 clamp(22px, 4vw, 36px);
  border-bottom: 1px solid var(--ink-700);
}

.page-about .about-intro h1 {
  margin: 10px 0 18px;
  font-size: clamp(2rem, 6.4vw, 3.5rem);
  line-height: 1.16;
  letter-spacing: -.025em;
  color: var(--snow-50);
  max-width: 20ch;
}

.page-about .about-intro .lede {
  max-width: 62ch;
  color: var(--ice-200);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: clamp(20px, 4vw, 34px);
}

.page-about .about-stats .stat {
  padding: 14px 12px 14px 16px;
  background: linear-gradient(150deg, var(--ink-800), var(--ink-900));
  border: 1px solid var(--ink-700);
  border-left: 2px solid var(--cyan-500);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-stats .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2rem);
  line-height: 1;
  color: var(--amber-300);
}

.page-about .about-stats .stat__label {
  font-size: .78rem;
  line-height: 1.5;
  color: var(--fog-400);
}

/* 章节导航 */
.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 18px 0 clamp(14px, 3vw, 24px);
}

.page-about .about-jump__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--ink-700);
  border-radius: 999px;
  color: var(--ice-200);
  text-decoration: none;
  font-size: .85rem;
  transition: border-color var(--dur) ease, color var(--dur) ease, transform var(--dur) ease;
}

.page-about .about-jump__link:hover,
.page-about .about-jump__link:focus-visible {
  border-color: var(--cyan-500);
  color: var(--cyan-300);
  transform: translateY(-2px);
}

.page-about .about-jump__num {
  font-family: var(--font-mono);
  font-size: .74rem;
  color: var(--amber-500);
}

/* 章节通用 */
.page-about .about-section {
  padding-block: clamp(30px, 5vw, 56px);
}

.page-about .section-head {
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .section-head h2 {
  margin: 8px 0 10px;
  font-size: clamp(1.4rem, 3.6vw, 2.1rem);
  line-height: 1.28;
  letter-spacing: -.02em;
  color: var(--snow-50);
  max-width: 24ch;
}

.page-about .section-head .lede {
  max-width: 64ch;
  color: var(--fog-400);
}

.page-about .about-figure {
  margin: clamp(20px, 4vw, 32px) 0 0;
}

.page-about .about-figure .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: 1px solid var(--ink-700);
}

.page-about .about-figure .media-frame__caption {
  margin-top: 8px;
  font-size: .8rem;
  color: var(--fog-400);
}

/* 起点与四板块 */
.page-about .about-origin {
  align-items: start;
  gap: clamp(18px, 3vw, 32px);
}

.page-about .about-origin .prose p {
  margin: 0 0 14px;
  max-width: 70ch;
}

.page-about .about-boards {
  background: linear-gradient(165deg, var(--ink-800), var(--ink-900));
  border-radius: var(--radius-lg);
  padding: clamp(18px, 3vw, 28px);
}

.page-about .about-boards .panel__title {
  font-size: 1.05rem;
  color: var(--snow-50);
}

.page-about .board-list {
  list-style: none;
  margin: 14px 0 18px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .board-list__item {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 10px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--ink-700);
}

.page-about .board-list__item:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .board-list__num {
  font-family: var(--font-mono);
  font-size: .82rem;
  color: var(--cyan-500);
  padding-top: 3px;
}

.page-about .board-list__name {
  margin: 0 0 3px;
  font-weight: 700;
  color: var(--snow-50);
  font-size: .95rem;
}

.page-about .board-list__desc {
  margin: 0;
  font-size: .88rem;
  line-height: 1.7;
  color: var(--fog-400);
}

/* 版本时间轴 */
.page-about .version-tabs {
  display: grid;
  gap: clamp(16px, 3vw, 26px);
}

.page-about .version-track {
  display: flex;
  flex-direction: column;
  gap: 10px;
  position: relative;
}

.page-about .version-node {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 12px 16px;
  background: var(--ink-900);
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-md);
  color: var(--ice-200);
  text-align: left;
  font: inherit;
  cursor: pointer;
  transition: transform var(--dur) ease, border-color var(--dur) ease, background var(--dur) ease;
}

.page-about .version-node:hover {
  transform: translateX(4px);
  border-color: var(--cyan-500);
}

.page-about .version-node[aria-selected="true"] {
  border-color: var(--cyan-500);
  background: linear-gradient(100deg, var(--about-soft), transparent 72%), var(--ink-800);
  box-shadow: inset 3px 0 0 var(--cyan-500);
}

.page-about .version-node__id {
  font-family: var(--font-mono);
  font-size: 1rem;
  letter-spacing: .04em;
  color: var(--amber-300);
}

.page-about .version-node__name {
  font-size: .92rem;
  font-weight: 700;
  color: var(--snow-50);
}

.page-about .version-panel {
  background: var(--ink-800);
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-lg);
  padding: clamp(18px, 3vw, 32px);
  box-shadow: var(--shadow-panel);
}

.page-about .version-panel[hidden] {
  display: none;
}

.page-about .version-panel h3 {
  margin: 10px 0 12px;
  font-size: clamp(1.1rem, 2.6vw, 1.4rem);
  color: var(--snow-50);
  letter-spacing: -.01em;
}

.page-about .version-panel p {
  margin: 0 0 14px;
  max-width: 66ch;
  color: var(--ice-200);
  font-size: .95rem;
  line-height: 1.78;
}

.page-about .version-points {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .version-points li {
  position: relative;
  padding-left: 18px;
  font-size: .88rem;
  line-height: 1.7;
  color: var(--fog-400);
}

.page-about .version-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 8px;
  height: 2px;
  background: var(--cyan-500);
}

.page-about .version-panel .btn {
  margin-top: 4px;
}

/* 切换周期 */
.page-about .cycle-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

.page-about .cycle-card {
  padding: 20px;
  background: linear-gradient(160deg, var(--ink-800), var(--ink-900) 78%);
  border: 1px solid var(--ink-700);
  border-top: 2px solid var(--cyan-500);
  border-radius: var(--radius-md);
}

.page-about .cycle-card--amber {
  border-top-color: var(--amber-500);
  background: linear-gradient(160deg, rgba(255, 178, 74, .12), var(--ink-900) 76%);
}

.page-about .cycle-card__num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4.4vw, 2.1rem);
  line-height: 1;
  color: var(--cyan-300);
}

.page-about .cycle-card--amber .cycle-card__num {
  color: var(--amber-300);
}

.page-about .cycle-card h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  color: var(--snow-50);
}

.page-about .cycle-card p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.72;
  color: var(--fog-400);
}

.page-about .cycle-note {
  margin-top: 16px;
  padding: clamp(16px, 3vw, 26px);
  background: var(--ink-900);
  border-left: 3px solid var(--amber-500);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.page-about .cycle-note p {
  margin: 0 0 16px;
  max-width: 70ch;
  font-size: .93rem;
  line-height: 1.8;
  color: var(--ice-200);
}

.page-about .cycle-note__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* 团队 */
.page-about .team-layout {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .team-bar {
  display: flex;
  height: 46px;
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--ink-700);
}

.page-about .team-bar__seg {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: .86rem;
  font-weight: 700;
  color: var(--ink-950);
  min-width: 0;
}

.page-about .team-bar__seg--a { flex: 8; background: var(--cyan-500); }
.page-about .team-bar__seg--b { flex: 6; background: var(--cyan-300); }
.page-about .team-bar__seg--c { flex: 9; background: var(--amber-500); }
.page-about .team-bar__seg--d { flex: 5; background: var(--ice-200); }

.page-about .team-legend {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .team-legend__item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .84rem;
  color: var(--fog-400);
}

.page-about .team-legend__dot {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  flex: 0 0 auto;
}

.page-about .team-legend__dot--a { background: var(--cyan-500); }
.page-about .team-legend__dot--b { background: var(--cyan-300); }
.page-about .team-legend__dot--c { background: var(--amber-500); }
.page-about .team-legend__dot--d { background: var(--ice-200); }

.page-about .about-fold {
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-md);
  background: var(--ink-900);
  overflow: hidden;
}

.page-about .about-fold + .about-fold {
  margin-top: 10px;
}

.page-about .about-fold summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
  font-weight: 700;
  font-size: .95rem;
  color: var(--snow-50);
}

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

.page-about .about-fold summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--cyan-500);
  line-height: 1;
}

.page-about .about-fold[open] summary::after {
  content: "\2212";
}

.page-about .about-fold[open] summary {
  border-bottom: 1px solid var(--ink-700);
  color: var(--cyan-300);
}

.page-about .about-fold__body {
  padding: 14px 18px 16px;
  font-size: .89rem;
  line-height: 1.78;
  color: var(--fog-400);
}

/* 服务分区 */
.page-about .zone-layout {
  display: grid;
  gap: clamp(16px, 3vw, 26px);
}

.page-about .zone-grid {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .zone {
  padding: 14px;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-md);
  background: linear-gradient(155deg, var(--ink-800), var(--ink-900));
  position: relative;
  overflow: hidden;
}

.page-about .zone::after {
  content: "";
  position: absolute;
  right: -18px;
  bottom: -22px;
  width: 62px;
  height: 62px;
  background: var(--about-soft);
  border-radius: 46% 54% 60% 40%;
  pointer-events: none;
}

.page-about .zone--base {
  border-color: var(--cyan-500);
  grid-column: span 2;
  background: linear-gradient(140deg, rgba(56, 224, 208, .16), var(--ink-900) 72%);
}

.page-about .zone__name {
  margin: 0 0 5px;
  font-family: var(--font-mono);
  font-size: .95rem;
  letter-spacing: .06em;
  color: var(--snow-50);
}

.page-about .zone--base .zone__name {
  color: var(--cyan-300);
}

.page-about .zone__desc {
  margin: 0;
  font-size: .82rem;
  line-height: 1.65;
  color: var(--fog-400);
  position: relative;
  z-index: 1;
}

.page-about .zone-side {
  background: var(--ink-800);
  border-radius: var(--radius-lg);
  padding: clamp(18px, 3vw, 26px);
}

.page-about .zone-side .panel__title {
  font-size: 1.02rem;
  color: var(--snow-50);
}

.page-about .zone-side__row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  margin: 0;
  padding: 10px 0;
  border-bottom: 1px dashed var(--ink-700);
}

.page-about .zone-side__key {
  font-size: .82rem;
  color: var(--fog-400);
  min-width: 68px;
}

.page-about .zone-side__val {
  font-family: var(--font-mono);
  font-size: .86rem;
  color: var(--amber-300);
}

.page-about .zone-side__note {
  margin: 14px 0 16px;
  font-size: .84rem;
  line-height: 1.7;
  color: var(--fog-400);
}

/* 合作与资质 */
.page-about .eco-layout {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
  align-items: start;
}

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

.page-about .cred-tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.page-about .cred-tab {
  padding: 9px 16px;
  border: 1px solid var(--ink-700);
  border-radius: 999px;
  background: var(--ink-900);
  color: var(--ice-200);
  font: inherit;
  font-size: .86rem;
  cursor: pointer;
  transition: border-color var(--dur) ease, color var(--dur) ease;
}

.page-about .cred-tab:hover {
  border-color: var(--cyan-500);
  color: var(--cyan-300);
}

.page-about .cred-tab[aria-selected="true"] {
  border-color: var(--amber-500);
  color: var(--amber-300);
  background: rgba(255, 178, 74, .1);
}

.page-about .cred-panel[hidden] {
  display: none;
}

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

.page-about .cred-list__item {
  padding: 16px 18px;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-md);
  background: linear-gradient(150deg, var(--ink-800), var(--ink-900));
  position: relative;
}

.page-about .cred-list__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 2px;
  background: var(--cyan-500);
  border-radius: 2px;
}

.page-about .cred-list__name {
  margin: 0 0 6px;
  font-weight: 700;
  font-size: .95rem;
  color: var(--snow-50);
}

.page-about .cred-list__desc {
  margin: 0;
  font-size: .86rem;
  line-height: 1.72;
  color: var(--fog-400);
}

/* 日常维护 */
.page-about .maint-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--ink-700);
}

.page-about .maint-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--ink-700);
}

.page-about .maint-item__time {
  font-family: var(--font-mono);
  font-size: .9rem;
  color: var(--cyan-300);
  letter-spacing: .04em;
}

.page-about .maint-item__name {
  margin: 0 0 4px;
  font-weight: 700;
  font-size: .96rem;
  color: var(--snow-50);
}

.page-about .maint-item__desc {
  margin: 0;
  font-size: .87rem;
  line-height: 1.72;
  color: var(--fog-400);
  max-width: 68ch;
}

.page-about .maint-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

/* 收尾 */
.page-about .about-cta {
  padding-block: clamp(28px, 5vw, 54px) 0;
}

.page-about .about-cta__inner {
  padding: clamp(22px, 4vw, 40px);
  background:
    radial-gradient(120% 140% at 8% 0%, rgba(56, 224, 208, .16), transparent 58%),
    linear-gradient(150deg, var(--ink-800), var(--ink-950));
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-lg);
}

.page-about .about-cta__inner h2 {
  margin: 8px 0 12px;
  font-size: clamp(1.3rem, 3.4vw, 1.9rem);
  line-height: 1.3;
  color: var(--snow-50);
  max-width: 24ch;
}

.page-about .about-cta__inner p {
  margin: 0 0 18px;
  max-width: 60ch;
  font-size: .93rem;
  line-height: 1.78;
  color: var(--ice-200);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-top {
  display: inline-block;
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .06em;
  color: var(--fog-400);
  text-decoration: none;
  border-bottom: 1px solid var(--ink-700);
  padding-bottom: 3px;
}

.page-about .about-top:hover,
.page-about .about-top:focus-visible {
  color: var(--cyan-300);
  border-bottom-color: var(--cyan-500);
}

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

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

  .page-about .zone--base {
    grid-column: span 1;
  }

  .page-about .maint-item {
    grid-template-columns: 120px 1fr;
    gap: 18px;
    align-items: start;
  }

  .page-about .maint-item__time {
    padding-top: 2px;
  }
}

@media (min-width: 960px) {
  .page-about .version-tabs {
    grid-template-columns: 260px minmax(0, 1fr);
    align-items: start;
  }

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

  .page-about .version-track::before {
    content: "";
    position: absolute;
    left: 6px;
    top: 12px;
    bottom: 12px;
    width: 1px;
    background: linear-gradient(180deg, var(--cyan-500), var(--ink-700));
    opacity: .55;
  }

  .page-about .version-node {
    margin-left: 18px;
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
  }

  .page-about .zone-layout {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .eco-layout {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  }

  .page-about .about-origin {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .version-node,
  .page-about .about-jump__link {
    transition: none;
  }

  .page-about .version-node:hover,
  .page-about .about-jump__link:hover {
    transform: none;
  }
}
<<<END>>>