.page-about {
  background: var(--c-bg);
}

/* 面包屑区 */
.page-about .crumbs {
  padding-top: 18px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--c-grid);
}

/* 首屏：对角错位色块 */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--c-grid);
  background-color: var(--c-bg);
  background-image:
    linear-gradient(to right, rgba(35, 64, 58, 0.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(35, 64, 58, 0.35) 1px, transparent 1px);
  background-size: 72px 100%, 100% 72px;
  padding: clamp(30px, 5vw, 68px) 0 clamp(30px, 5vw, 60px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -25%;
  right: -12%;
  width: 58%;
  height: 155%;
  background: linear-gradient(158deg, rgba(198, 255, 61, 0.13), rgba(198, 255, 61, 0) 66%);
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 38%;
  height: 4px;
  background: var(--c-lime);
  clip-path: polygon(0 0, 100% 0, 96% 100%, 0 100%);
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: 28px;
}

.page-about .about-hero__lead h1 {
  margin: 14px 0 18px;
  max-width: 22ch;
}

.page-about .about-hero__aside {
  align-self: end;
}

.page-about .about-hero__note {
  margin: 14px 0 0;
  padding-left: 12px;
  border-left: 3px solid var(--c-orange);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.6;
  letter-spacing: 0.01em;
  color: var(--c-ink-dim);
}

/* 首屏数据格 */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--c-grid);
  border: 1px solid var(--c-grid);
}

.page-about .about-stats__cell {
  background: var(--c-panel);
  padding: 14px 16px 16px;
}

.page-about .about-stats__v {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stats__k {
  margin: 8px 0 0;
  font-size: 0.8125rem;
  color: var(--c-ink-dim);
}

/* 主体分栏：左刻度轴 + 右内容流 */
.page-about .about-body {
  display: grid;
  gap: 0;
  padding-top: clamp(18px, 3vw, 34px);
  padding-bottom: clamp(40px, 7vw, 90px);
}

.page-about .about-rail {
  border-bottom: 1px solid var(--c-grid);
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-rail__list {
  display: flex;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 14px 11px 0;
  margin-right: 14px;
  white-space: nowrap;
  text-decoration: none;
  color: var(--c-ink-dim);
  border-bottom: 3px solid transparent;
  transition: color 120ms var(--ease), border-color 120ms var(--ease), transform 120ms var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--c-lime);
  border-bottom-color: var(--c-lime);
  transform: translateX(4px);
}

.page-about .about-rail__code {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
}

.page-about .about-rail__label {
  font-size: 0.8125rem;
}

.page-about .about-stream {
  min-width: 0;
}

/* 章节通用 */
.page-about .about-sec {
  padding: clamp(26px, 4vw, 50px) 0;
  border-top: 1px solid var(--c-grid);
}

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

.page-about .about-sec__head {
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.page-about .about-sec__head h2 {
  margin: 10px 0 0;
  max-width: 24ch;
}

.page-about .about-sec__body p {
  margin: 0 0 14px;
  max-width: 40rem;
  color: var(--c-ink);
}

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

.page-about .about-sec--short .about-sec__body p {
  max-width: 36rem;
}

.page-about .about-sec__meta {
  margin: 22px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--c-grid);
  font-size: 0.875rem;
  color: var(--c-ink-dim);
}

.page-about .about-sec__meta a {
  color: var(--c-lime);
  text-decoration: none;
  border-bottom: 1px solid var(--c-lime-dim);
}

.page-about .about-sec__meta a:hover {
  border-bottom-color: var(--c-lime);
}

/* 章程式引用 */
.page-about .clause {
  margin: 20px 0 0;
  padding-left: 16px;
  border-left: 3px solid var(--c-lime);
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--c-ink);
  max-width: 40rem;
}

.page-about .clause__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--c-lime);
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}

/* 演进章节：图文错位 */
.page-about .about-evolve {
  display: grid;
  gap: 22px;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-evolve__figure {
  margin: 0;
}

.page-about .about-evolve__wide {
  margin: clamp(24px, 4vw, 40px) 0 0;
}

.page-about .about-evolve__text p {
  max-width: 40rem;
}

.page-about .about-evolve__text a {
  color: var(--c-lime);
  text-decoration: none;
  border-bottom: 1px solid var(--c-lime-dim);
}

.page-about .about-evolve__text a:hover {
  border-bottom-color: var(--c-lime);
}

/* 表格说明 */
.page-about .about-table__cap {
  padding: 0 0 12px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  color: var(--c-ink-dim);
}

/* 字段增长条 */
.page-about .about-chart {
  margin-top: clamp(22px, 3.4vw, 34px);
  border: 1px solid var(--c-grid);
  padding: 16px 16px 18px;
  background: var(--c-panel);
}

.page-about .about-chart__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 0.9375rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-ink-dim);
}

.page-about .about-chart__row {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr) 34px;
  align-items: center;
  gap: 10px;
  padding: 5px 0;
  transition: background-color 120ms var(--ease);
}

.page-about .about-chart__row:hover .about-chart__track {
  background: var(--c-panel-2);
}

.page-about .about-chart__row:hover .about-chart__val {
  color: var(--c-lime);
}

.page-about .about-chart__name,
.page-about .about-chart__val {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
  color: var(--c-ink-dim);
}

.page-about .about-chart__val {
  text-align: right;
  transition: color 120ms var(--ease);
}

.page-about .about-chart__track {
  display: block;
  height: 8px;
  background: var(--c-bg);
  transition: background-color 120ms var(--ease);
}

.page-about .about-chart__bar {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--c-lime-dim), var(--c-lime));
}

/* 团队三列 */
.page-about .about-team {
  display: grid;
  gap: 0;
  border: 1px solid var(--c-grid);
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .about-team__item {
  padding: 18px 18px 20px;
  border-bottom: 1px solid var(--c-grid);
  background: linear-gradient(180deg, rgba(20, 51, 43, 0.55), rgba(11, 31, 26, 0));
}

.page-about .about-team__item:last-child {
  border-bottom: 0;
}

.page-about .about-team__num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--c-lime);
}

.page-about .about-team__name {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-size: 1.125rem;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}

.page-about .about-team__size {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--c-orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--c-ink);
}

.page-about .about-team__figure {
  margin: clamp(22px, 3.6vw, 36px) 0 0;
}

/* 流程折叠组 */
.page-about .about-flow {
  margin-top: clamp(16px, 2.6vw, 24px);
  border-top: 1px solid var(--c-grid);
}

.page-about .about-flow .accordion {
  border-bottom: 1px solid var(--c-grid);
}

.page-about .about-flow .accordion__summary {
  padding: 14px 0;
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.01em;
  color: var(--c-paper);
}

.page-about .about-flow .accordion__summary:hover {
  color: var(--c-lime);
}

.page-about .about-flow .accordion__body p {
  margin: 0 0 16px;
  max-width: 40rem;
  color: var(--c-ink);
}

/* 共建列表 */
.page-about .about-links {
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--c-grid);
}

.page-about .about-links__item {
  padding: 16px 0;
  border-bottom: 1px solid var(--c-grid);
}

.page-about .about-links__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
  color: var(--c-lime);
}

.page-about .about-links__desc {
  margin: 0;
  max-width: 42rem;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--c-ink);
}

.page-about .about-links__desc a {
  color: var(--c-lime);
  text-decoration: none;
  border-bottom: 1px solid var(--c-lime-dim);
}

.page-about .about-links__desc a:hover {
  border-bottom-color: var(--c-lime);
}

/* 承诺区块 */
.page-about .about-sec--promise {
  border-top: 1px solid var(--c-lime-dim);
}

.page-about .about-promise__grid {
  display: grid;
  gap: 20px;
}

.page-about .about-promise__lede {
  margin: 0;
  max-width: 40rem;
  color: var(--c-ink);
}

.page-about .about-promise__act {
  padding: 16px 18px;
  background: var(--c-panel);
  border-left: 3px solid var(--c-orange);
}

.page-about .about-promise__line {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--c-paper);
  font-variant-numeric: tabular-nums;
  word-break: break-all;
}

.page-about .about-promise__act .btn {
  margin-top: 8px;
}

/* 图片容器 */
.page-about .figure-frame__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* 响应式 */
@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-team__item {
    border-bottom: 0;
    border-right: 1px solid var(--c-grid);
  }

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

  .page-about .about-promise__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: start;
    gap: 32px;
  }
}

@media (min-width: 980px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: end;
    gap: 56px;
  }

  .page-about .about-body {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 0 44px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 88px;
    align-self: start;
    border-bottom: 0;
    border-right: 1px solid var(--c-grid);
    padding-right: 12px;
    margin-bottom: 0;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    overflow: visible;
  }

  .page-about .about-rail__link {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    position: relative;
    padding: 10px 12px 10px 12px;
    margin-right: 0;
    border-bottom: 0;
    border-top: 1px solid var(--c-grid);
  }

  .page-about .about-rail__link::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    width: 3px;
    height: 100%;
    background: transparent;
    transition: background-color 120ms var(--ease);
  }

  .page-about .about-rail__link:hover::before,
  .page-about .about-rail__link:focus-visible::before {
    background: var(--c-lime);
  }

  .page-about .about-evolve {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .about-sec__head h2 {
    font-size: 1.75rem;
  }
}

@media (max-width: 699px) {
  .page-about .about-hero::before {
    width: 78%;
    opacity: 0.7;
  }

  .page-about .about-chart__row {
    grid-template-columns: 60px minmax(0, 1fr) 30px;
    gap: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-chart__row,
  .page-about .about-chart__track,
  .page-about .about-chart__val {
    transition: none;
  }

  .page-about .about-rail__link:hover {
    transform: none;
  }
}