.page-about {
  --about-rule: #2A3555;
  background-color: var(--indigo);
  color: var(--fog);
  overflow-x: clip;
}

.page-about .breadcrumbs {
  margin: clamp(20px, 3vw, 36px) 0 0;
}

/* ---------- 首屏：主题声明 + 页内索引 ---------- */
.page-about .about-intro {
  padding: clamp(28px, 4.5vw, 62px) 0 clamp(34px, 5vw, 70px);
}

.page-about .about-intro__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .about-intro .eyebrow {
  color: var(--cyan);
  letter-spacing: 0.16em;
}

.page-about .about-intro h1 {
  font-size: clamp(30px, 6vw, 66px);
  line-height: 1.07;
  letter-spacing: -0.022em;
  margin: 14px 0 clamp(16px, 2.4vw, 26px);
  max-width: 20ch;
}

.page-about .about-intro .lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.8;
  color: var(--body-dim);
}

.page-about .about-intro__index-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--slate);
}

.page-about .about-intro__index ol {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--about-rule);
}

.page-about .about-intro__index li {
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-intro__index a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 2px;
  color: var(--body-dim);
  text-decoration: none;
  font-size: 15px;
  transition: color 0.16s var(--ease), padding-left 0.16s var(--ease);
}

.page-about .about-intro__index a .idx {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
  letter-spacing: 0.06em;
}

.page-about .about-intro__index a:hover,
.page-about .about-intro__index a:focus-visible {
  color: var(--cyan);
  padding-left: 10px;
}

@media (min-width: 900px) {
  .page-about .about-intro__grid {
    grid-template-columns: minmax(0, 1fr) minmax(230px, 320px);
    gap: clamp(40px, 6vw, 90px);
  }
}

/* ---------- 全宽数据条 ---------- */
.page-about .about-band {
  border-top: 2px solid var(--about-rule);
  background: linear-gradient(115deg, var(--midnight) 0%, var(--midnight) 60%, rgba(138, 92, 255, 0.16) 100%);
}

.page-about .about-band__track {
  display: grid;
  grid-template-columns: 1fr;
}

.page-about .about-band__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(16px, 2.4vw, 26px) clamp(14px, 2.2vw, 28px);
  border-top: 1px solid var(--about-rule);
}

.page-about .about-band__item:first-child {
  border-top: 0;
}

.page-about .about-band__value {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .about-band__label {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--slate);
}

@media (min-width: 760px) {
  .page-about .about-band__track {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-band__item {
    border-top: 0;
    border-left: 1px solid var(--about-rule);
  }

  .page-about .about-band__item:first-child {
    border-left: 0;
  }
}

/* ---------- 章节骨架：左侧索引 / 右侧叙事 ---------- */
.page-about .about-chapter {
  border-top: 2px solid var(--about-rule);
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 3vw, 40px);
  padding: clamp(40px, 6vw, 88px) 0;
}

.page-about .about-chapter__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(34px, 5.4vw, 62px);
  font-weight: 700;
  line-height: 0.92;
  color: var(--cyan);
}

.page-about .about-chapter__kicker {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--slate);
}

.page-about .about-chapter__title {
  margin: 0 0 clamp(16px, 2.2vw, 26px);
  max-width: 24ch;
  font-size: clamp(24px, 3.6vw, 42px);
  line-height: 1.16;
  letter-spacing: -0.016em;
}

.page-about .about-chapter__body p {
  margin: 0 0 16px;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--body-dim);
}

.page-about .about-note {
  margin-top: clamp(20px, 3vw, 30px);
  padding-left: 16px;
  border-left: 4px solid var(--violet);
  font-size: 15px;
  line-height: 1.75;
  color: var(--slate);
}

@media (min-width: 900px) {
  .page-about .about-chapter__grid {
    grid-template-columns: minmax(140px, 200px) minmax(0, 1fr);
    gap: clamp(32px, 5.5vw, 96px);
  }

  .page-about .about-chapter__aside {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }
}

/* ---------- 引用块 ---------- */
.page-about .about-quote {
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: clamp(18px, 2.4vw, 26px) clamp(18px, 2.6vw, 30px);
  background: var(--midnight);
  border: 2px solid var(--ink);
  border-left: 8px solid var(--cyan);
  box-shadow: var(--shadow-hard);
}

.page-about .about-quote p {
  margin: 0;
  max-width: 46ch;
  color: var(--fog);
  font-size: clamp(17px, 1.7vw, 21px);
  line-height: 1.6;
}

/* ---------- 指标口径折叠 ---------- */
.page-about .about-details {
  display: grid;
  gap: 10px;
  margin: clamp(10px, 1.6vw, 18px) 0 0;
}

.page-about .about-detail {
  border: 2px solid var(--about-rule);
  background: var(--midnight);
  transition: border-color 0.18s var(--ease);
}

.page-about .about-detail[open] {
  border-color: var(--cyan);
}

.page-about .about-detail summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 700;
  color: var(--fog);
}

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

.page-about .about-detail summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
}

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

.page-about .about-detail summary:hover {
  color: var(--cyan);
}

.page-about .about-detail summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .about-detail__label {
  flex: 1 1 auto;
}

.page-about .about-detail__hint {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.page-about .about-detail p {
  margin: 0;
  padding: 0 16px 16px;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--body-dim);
}

/* ---------- 图形容器 ---------- */
.page-about .about-figure {
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  border: 2px solid var(--ink);
  background: var(--midnight);
  box-shadow: var(--shadow-cyan);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  background: linear-gradient(160deg, #0A0E2A, #111633);
}

.page-about .about-figure figcaption {
  border-top: 2px solid var(--ink);
  padding: 11px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--slate);
}

/* ---------- 覆盖维度数字卡 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin: clamp(20px, 3vw, 32px) 0 0;
}

.page-about .about-stat {
  border: 2px solid var(--ink);
  background: var(--midnight);
  padding: 16px 16px 18px;
  box-shadow: 4px 4px 0 rgba(0, 229, 255, 0.2);
}

.page-about .about-stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .about-stat:nth-child(2) .about-stat__value {
  color: var(--mint);
}

.page-about .about-stat:nth-child(3) .about-stat__value {
  color: var(--orange);
}

.page-about .about-stat:nth-child(4) .about-stat__value {
  color: var(--violet);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate);
}

/* ---------- 斜向分割 ---------- */
.page-about .about-slash {
  height: clamp(28px, 4.4vw, 54px);
  background: linear-gradient(90deg, var(--midnight) 0 44%, var(--violet) 44% 60%, var(--cyan) 60% 71%, var(--indigo) 71% 100%);
  clip-path: polygon(0 34%, 100% 0, 100% 66%, 0 100%);
  margin: clamp(6px, 1.4vw, 14px) 0;
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: clamp(20px, 3vw, 32px) 0 0;
}

.page-about .team-card {
  border: 2px solid var(--about-rule);
  background: var(--midnight);
  padding: 18px 16px 20px;
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  border-color: var(--cyan);
  box-shadow: var(--shadow-hard);
  transform: translateY(-4px);
}

.page-about .team-card__idx {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--violet);
}

.page-about .team-card__name {
  margin: 0 0 8px;
  font-size: 16px;
  line-height: 1.4;
  color: var(--fog);
}

.page-about .team-card__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
  transition: color 0.18s var(--ease);
}

.page-about .team-card:hover .team-card__desc,
.page-about .team-card:focus-within .team-card__desc {
  color: var(--body-dim);
}

@media (min-width: 560px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-team {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

/* ---------- 年份筛选与时间轴 ---------- */
.page-about .filter-bar {
  margin: clamp(16px, 2.4vw, 24px) 0 10px;
}

.page-about .filter-status {
  margin: 0 0 clamp(18px, 2.6vw, 28px);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--slate);
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: var(--about-rule);
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 clamp(22px, 3vw, 34px) clamp(28px, 4vw, 42px);
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 16px;
  height: 16px;
  box-sizing: border-box;
  background: var(--midnight);
  border: 3px solid var(--cyan);
}

.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .tl-title {
  margin: 6px 0 6px;
  font-size: clamp(17px, 1.8vw, 21px);
  line-height: 1.4;
  color: var(--fog);
}

.page-about .tl-desc {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--body-dim);
}

/* ---------- 信任边界 ---------- */
.page-about .about-trust {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: clamp(20px, 3vw, 30px) 0 0;
}

.page-about .trust-card {
  border: 2px solid var(--ink);
  border-top: 6px solid var(--violet);
  background: var(--midnight);
  padding: 18px 18px 20px;
}

.page-about .trust-card:nth-child(2) {
  border-top-color: var(--cyan);
}

.page-about .trust-card:nth-child(3) {
  border-top-color: var(--orange);
}

.page-about .trust-card:nth-child(4) {
  border-top-color: var(--mint);
}

.page-about .trust-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  color: var(--fog);
}

.page-about .trust-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--body-dim);
}

@media (min-width: 720px) {
  .page-about .about-trust {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 后续入口 ---------- */
.page-about .about-next {
  border-top: 2px solid var(--about-rule);
  padding: clamp(36px, 5vw, 70px) 0 clamp(48px, 6vw, 92px);
}

.page-about .about-next h2 {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  font-size: clamp(20px, 2.4vw, 28px);
  letter-spacing: -0.01em;
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 10px;
}

.page-about .about-next__link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  border: 2px solid var(--about-rule);
  background: var(--midnight);
  color: var(--fog);
  text-decoration: none;
  transition: border-color 0.18s var(--ease), transform 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: var(--cyan);
  background: var(--indigo);
  transform: translateY(-3px);
}

.page-about .about-next__label {
  font-size: 16px;
  font-weight: 700;
}

.page-about .about-next__desc {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--slate);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .about-next__link,
  .page-about .about-intro__index a {
    transition: none;
  }

  .page-about .team-card:hover,
  .page-about .team-card:focus-within,
  .page-about .about-next__link:hover,
  .page-about .about-next__link:focus-visible {
    transform: none;
  }
}