.page-about {
  --about-line: rgba(143, 163, 184, 0.32);
  --about-body-light: #3B4A5E;
  --about-link-light: #17427E;
  background: var(--night);
  color: var(--white);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-bottom: clamp(48px, 6vw, 88px);
  border-bottom: var(--bw) solid var(--about-line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(90% 70% at 12% -10%, rgba(36, 214, 232, 0.20), transparent 62%),
    radial-gradient(70% 60% at 92% 6%, rgba(124, 92, 255, 0.18), transparent 60%),
    repeating-linear-gradient(112deg, rgba(53, 240, 162, 0.09) 0 1px, transparent 1px 26px);
}

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

.page-about .about-hero > .wrap:first-child {
  padding-top: clamp(24px, 3.2vw, 44px);
}

.page-about .about-hero__crumb {
  margin-bottom: clamp(20px, 3vw, 34px);
  font-family: var(--font-cond);
  font-size: var(--fs-14);
  letter-spacing: 0.04em;
}

.page-about .breadcrumb a {
  color: var(--cyan);
}

.page-about .breadcrumb a:hover {
  color: var(--lime);
}

.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: var(--fs-14);
  letter-spacing: 0.16em;
  color: var(--lime);
}

.page-about .about-hero__dot {
  width: 10px;
  height: 10px;
  background: var(--lime);
  display: inline-block;
}

.page-about .about-hero__title {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(29px, 4.2vw, 54px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 0 0 clamp(16px, 2vw, 24px);
  max-width: 22em;
}

.page-about .about-hero__lede {
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.8;
  color: var(--gray);
  max-width: 60ch;
  margin: 0 0 clamp(28px, 3.5vw, 44px);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  border: 2px solid var(--about-line);
  background: var(--about-line);
}

.page-about .about-hero__stat {
  background: var(--night);
  padding: clamp(14px, 2vw, 22px) clamp(14px, 2vw, 24px);
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-hero__stat-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime);
}

.page-about .about-hero__stat-label {
  font-size: var(--fs-14);
  line-height: 1.5;
  color: var(--gray);
}

.page-about .about-hero__frame {
  margin: clamp(34px, 4.5vw, 60px) 0 0;
  padding: 8px;
  background: var(--indigo);
  border: var(--bw) solid var(--lime);
  box-shadow: 8px 8px 0 rgba(53, 240, 162, 0.22);
}

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

.page-about .about-hero__caption {
  margin: 12px 0 4px;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--gray);
}

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

/* ============ 主体两栏 ============ */
.page-about .about-grid {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(40px, 5vw, 72px) var(--edge) clamp(64px, 8vw, 120px);
  display: grid;
  gap: clamp(32px, 4vw, 56px);
  min-width: 0;
}

@media (min-width: 1024px) {
  .page-about .about-grid {
    grid-template-columns: 232px minmax(0, 1fr);
    align-items: start;
  }
}

/* ---- 左侧档案轴 ---- */
.page-about .about-spine {
  display: grid;
  gap: 14px;
  min-width: 0;
  align-content: start;
}

@media (min-width: 1024px) {
  .page-about .about-spine {
    position: sticky;
    top: 34px;
  }
}

.page-about .about-spine__cap {
  margin: 0;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  color: var(--gray);
}

.page-about .about-spine__cap--axis {
  margin-top: 10px;
  color: var(--lime);
}

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

.page-about .about-spine__nav a {
  display: inline-block;
  padding: 7px 12px;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: var(--fs-14);
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--white);
  border: 2px solid var(--about-line);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-spine__nav a:hover,
.page-about .about-spine__nav a:focus-visible {
  border-color: var(--lime);
  color: var(--lime);
}

.page-about .about-spine__axis {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 2px solid var(--about-line);
}

.page-about .about-spine__axis li {
  position: relative;
}

.page-about .about-spine__axis a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0 9px 20px;
  font-size: var(--fs-14);
  line-height: 1.5;
  color: var(--gray);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .about-spine__axis a::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 50%;
  transform: translateY(-50%);
  width: 10px;
  height: 10px;
  background: var(--night);
  border: 2px solid var(--gray);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-spine__axis a .num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--fs-14);
  color: var(--white);
}

.page-about .about-spine__axis a:hover,
.page-about .about-spine__axis a:focus-visible {
  color: var(--lime);
}

.page-about .about-spine__axis a:hover::before,
.page-about .about-spine__axis a:focus-visible::before {
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .about-spine__axis-label {
  font-family: var(--font-cond);
  letter-spacing: 0.03em;
}

@media (min-width: 1024px) {
  .page-about .about-spine__nav {
    flex-direction: column;
    gap: 0;
  }

  .page-about .about-spine__nav a {
    display: block;
    padding: 7px 0 7px 14px;
    border-width: 0 0 0 3px;
    border-style: solid;
    border-color: var(--about-line);
  }

  .page-about .about-spine__nav a:hover,
  .page-about .about-spine__nav a:focus-visible {
    border-left-color: var(--lime);
    background: rgba(53, 240, 162, 0.07);
  }
}

/* ---- 右侧阅读流 ---- */
.page-about .about-flow {
  display: grid;
  gap: clamp(40px, 5vw, 72px);
  min-width: 0;
}

.page-about .about-sec {
  position: relative;
  min-width: 0;
  padding: clamp(24px, 3.2vw, 44px);
  border: var(--bw) solid var(--about-line);
  background: var(--indigo);
}

.page-about .about-sec--light {
  background: var(--mist);
  color: var(--ink);
  border-color: var(--ink);
  box-shadow: 8px 8px 0 var(--violet);
}

.page-about .about-sec__tag {
  display: inline-block;
  margin: 0 0 16px;
  padding: 4px 10px;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  color: var(--night);
  background: var(--lime);
}

.page-about .about-sec--light .about-sec__tag {
  background: var(--ink);
  color: var(--lime);
}

.page-about .about-sec__title {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(22px, 2.5vw, 32px);
  line-height: 1.28;
  letter-spacing: -0.005em;
  margin: 0 0 18px;
}

.page-about .about-sec__p {
  font-size: var(--fs-16);
  line-height: 1.8;
  margin: 0 0 1em;
  color: var(--gray);
}

.page-about .about-sec__p:last-child {
  margin-bottom: 0;
}

.page-about .about-sec--light .about-sec__p {
  color: var(--about-body-light);
}

.page-about .about-sec h3 {
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: var(--fs-20);
  letter-spacing: 0.02em;
  margin: 0 0 10px;
}

.page-about .about-subhead {
  margin: 26px 0 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--about-line);
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: var(--fs-16);
  letter-spacing: 0.14em;
  color: var(--lime);
}

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

.page-about .about-link:hover {
  color: var(--lime);
}

.page-about .about-sec--light .about-link {
  color: var(--about-link-light);
}

.page-about .about-sec--light .about-link:hover {
  color: var(--violet);
}

/* ---- 引用块 ---- */
.page-about .about-quote {
  margin: 24px 0;
  padding: 20px 22px;
  background: #FFFFFF;
  border: var(--bw) solid var(--ink);
  border-left-width: 10px;
  box-shadow: var(--shadow-hard-sm);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(17px, 1.7vw, 21px);
  line-height: 1.62;
  color: var(--ink);
}

.page-about .about-quote--rule {
  border-left-color: var(--violet);
}

/* ---- 列表 ---- */
.page-about .about-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-list li {
  position: relative;
  padding-left: 18px;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--gray);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 8px;
  height: 8px;
  background: var(--lime);
}

.page-about .about-sec--light .about-list li {
  color: var(--about-body-light);
}

.page-about .about-sec--light .about-list li::before {
  background: var(--ink);
}

/* ---- 图片块 ---- */
.page-about .about-figure {
  margin: 22px 0 26px;
  padding: 8px;
  background: var(--night);
  border: 2px solid var(--about-line);
}

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

.page-about .about-figure .frame__caption {
  margin: 10px 0 4px;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--gray);
}

.page-about .about-sec--light .about-figure {
  background: #FFFFFF;
  border-color: var(--ink);
}

.page-about .about-sec--light .about-figure .frame__caption {
  color: var(--about-body-light);
}

/* ---- 团队标签 ---- */
.page-about .team-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 18px;
}

.page-about .team-tab {
  padding: 8px 13px;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: var(--fs-14);
  letter-spacing: 0.03em;
  text-decoration: none;
  color: var(--white);
  border: 2px solid var(--about-line);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .team-tab:hover,
.page-about .team-tab:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .team-tab[data-active] {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--night);
}

.page-about .team-panel,
.page-about .version-panel {
  border-top: 2px solid var(--about-line);
  padding-top: 18px;
}

.page-about .team-panel + .team-panel,
.page-about .version-panel + .version-panel {
  margin-top: 22px;
}

/* ---- 版本 ---- */
.page-about .version-tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin: 22px 0 18px;
}

.page-about .version-tab {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 12px 14px;
  text-decoration: none;
  color: var(--white);
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: var(--fs-14);
  letter-spacing: 0.03em;
  border: 2px solid var(--about-line);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .version-tab .num {
  font-family: var(--font-mono);
  font-size: var(--fs-20);
  font-weight: 700;
  color: var(--lime);
}

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

.page-about .version-tab[data-active] {
  border-color: var(--lime);
  background: rgba(53, 240, 162, 0.10);
}

.page-about .version-panel h3 {
  color: var(--white);
}

@media (min-width: 720px) {
  .page-about .version-tabs {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* 渐进增强：仅在脚本接管后收拢未激活面板 */
.page-about [data-tabs][data-enhanced] .team-panel:not([data-active]),
.page-about [data-tabs][data-enhanced] .version-panel:not([data-active]) {
  display: none;
}

.page-about [data-tabs][data-enhanced] .team-panel:target,
.page-about [data-tabs][data-enhanced] .version-panel:target {
  display: block;
}

/* ---- 区域覆盖 ---- */
.page-about .cover-grid {
  list-style: none;
  margin: 22px 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  border: 2px solid var(--paper);
  background: var(--paper);
}

.page-about .cover-item {
  background: var(--mist);
  padding: 14px 16px;
  display: grid;
  gap: 4px;
  min-width: 0;
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .cover-item:hover {
  background: #FFFFFF;
  transform: translateX(3px);
}

.page-about .cover-item__name {
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: var(--fs-16);
  letter-spacing: 0.06em;
  color: var(--ink);
}

.page-about .cover-item__note {
  font-size: var(--fs-14);
  line-height: 1.68;
  color: var(--about-body-light);
}

@media (min-width: 620px) {
  .page-about .cover-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---- 合作生态 ---- */
.page-about .eco-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 22px 0 8px;
}

.page-about .eco-card {
  padding: 18px;
  background: var(--night);
  border: 2px solid var(--about-line);
  border-left: 6px solid var(--lime);
}

.page-about .eco-card h3 {
  font-family: var(--font-cond);
  font-size: var(--fs-16);
  letter-spacing: 0.06em;
  color: var(--white);
  margin: 0 0 8px;
}

.page-about .eco-card p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.78;
  color: var(--gray);
}

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

.page-about .eco-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  padding-top: 12px;
  border-top: 2px solid var(--about-line);
}

.page-about .eco-step__n {
  font-family: var(--font-mono);
  font-size: var(--fs-20);
  font-weight: 700;
  color: var(--orange);
  line-height: 1.2;
}

.page-about .eco-step h4 {
  margin: 0 0 6px;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: var(--fs-16);
  letter-spacing: 0.04em;
  color: var(--white);
}

.page-about .eco-step p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--gray);
}

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

  .page-about .eco-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 20px;
  }
}

/* ---- 准则列表 ---- */
.page-about .rule-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .rule-list li {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 2px solid var(--paper);
}

.page-about .rule-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .rule-item__title {
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: var(--fs-16);
  letter-spacing: 0.08em;
  color: var(--ink);
}

.page-about .rule-item__text {
  font-size: var(--fs-14);
  line-height: 1.78;
  color: var(--about-body-light);
}

/* ---- 收尾 CTA ---- */
.page-about .about-cta {
  padding: clamp(26px, 3.4vw, 44px);
  border: var(--bw) solid var(--lime);
  background:
    linear-gradient(135deg, rgba(53, 240, 162, 0.14), rgba(124, 92, 255, 0.18) 70%),
    var(--night);
}

.page-about .about-cta h2 {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(22px, 2.4vw, 31px);
  line-height: 1.3;
  margin: 0 0 12px;
  color: var(--white);
}

.page-about .about-cta p {
  max-width: 58ch;
  margin: 0 0 22px;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--gray);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}

.page-about .about-cta__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--gray);
  word-break: break-word;
}