.page-about {
  --about-axis-w: 200px;
  --about-col-gap: 60px;
  --about-text: rgba(230, 237, 242, 0.78);
  --about-text-soft: rgba(230, 237, 242, 0.6);
  background:
    linear-gradient(180deg,
      var(--c-ink) 0%,
      var(--c-deep) 8%,
      var(--c-deep) 24%,
      var(--c-layer) 56%,
      var(--c-layer) 72%,
      var(--c-deep) 100%);
  color: var(--c-mist);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(40px, 7vw, 84px) 0 clamp(34px, 5vw, 64px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--c-orange) 0%, var(--c-amber) 42%, var(--c-cyan) 100%);
  opacity: 0.85;
}

.page-about .about-eyebrow {
  margin-top: 22px;
  color: var(--c-cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .about-title {
  margin: 16px 0 0;
  max-width: 22ch;
  font-size: clamp(30px, 5.4vw, 56px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--c-mist);
}

.page-about .about-lede {
  margin: 20px 0 0;
  max-width: 42em;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.78;
  color: var(--about-text);
}

.page-about .about-hero-stats {
  list-style: none;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-hero-stat {
  position: relative;
  background: var(--c-deep);
  padding: 20px 18px 22px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.page-about .about-hero-stat::before {
  content: "";
  position: absolute;
  top: 0;
  left: 18px;
  width: 22px;
  height: 2px;
  background: linear-gradient(90deg, var(--c-orange), var(--c-amber));
}

.page-about .about-hero-num {
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: clamp(36px, 6vw, 56px);
  line-height: 0.9;
  letter-spacing: -0.025em;
  color: var(--c-mist);
}

.page-about .about-hero-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--c-grayblue);
}

/* ---------- 主体骨架 ---------- */

.page-about .about-body {
  padding-top: clamp(44px, 7vw, 84px);
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-about .about-body-inner {
  position: relative;
}

/* ---------- 左侧时间轴 ---------- */

.page-about .about-axis {
  display: none;
}

.page-about .axis-caption {
  margin: 0 0 14px;
  color: var(--c-grayblue);
}

.page-about .axis-list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 14px;
  position: relative;
}

.page-about .axis-list::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-orange) 0%, var(--c-amber) 38%, var(--c-cyan) 100%);
  opacity: 0.4;
}

.page-about .axis-link {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr);
  align-items: center;
  column-gap: 10px;
  padding: 9px 0;
  text-decoration: none;
  color: var(--c-grayblue);
  transition: color var(--dur) var(--ease);
}

.page-about .axis-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: var(--c-deep);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .axis-text {
  display: flex;
  align-items: baseline;
  gap: 8px;
  min-width: 0;
}

.page-about .axis-no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(126, 147, 163, 0.7);
}

.page-about .axis-label {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
}

.page-about .axis-link:hover,
.page-about .axis-link:focus-visible {
  color: var(--c-mist);
}

.page-about .axis-link:hover .axis-dot,
.page-about .axis-link:focus-visible .axis-dot {
  background: var(--c-orange);
  border-color: var(--c-orange);
  box-shadow: 0 0 0 4px var(--tint-orange);
}

/* ---------- 章节通用 ---------- */

.page-about .about-chapter {
  padding: clamp(34px, 5vw, 54px) 0;
  scroll-margin-top: calc(var(--header-total) + 20px);
}

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

.page-about .about-chapter + .about-chapter {
  border-top: 1px solid var(--line);
}

.page-about .about-chapter:target {
  background: linear-gradient(90deg, var(--tint-cyan) 0%, rgba(47, 209, 220, 0) 46%);
}

.page-about .about-chapter-head {
  margin-bottom: clamp(18px, 2.6vw, 26px);
}

.page-about .about-chapter-title {
  margin: 12px 0 0;
  max-width: 26ch;
  font-size: clamp(23px, 3.4vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--c-mist);
}

.page-about .about-text {
  margin: 0;
  max-width: 42em;
  font-size: clamp(15.5px, 1.5vw, 17px);
  line-height: 1.78;
  color: var(--about-text);
}

.page-about .about-text--after {
  margin-top: 24px;
}

.page-about .about-inline-link {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 209, 220, 0.4);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--c-orange);
  border-color: var(--c-orange);
}

/* ---------- 起步：年份轨迹 ---------- */

.page-about .origin-track {
  list-style: none;
  margin: clamp(24px, 3.4vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .origin-step {
  background: linear-gradient(180deg, rgba(10, 39, 64, 0.86), rgba(5, 25, 43, 0.86));
  padding: 22px 20px 24px;
  display: grid;
  gap: 10px;
  min-width: 0;
}

.page-about .origin-year {
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: clamp(42px, 8vw, 76px);
  line-height: 0.88;
  letter-spacing: -0.03em;
  color: var(--c-mist);
}

.page-about .origin-step:last-child .origin-year {
  color: var(--c-orange);
}

.page-about .origin-name {
  margin: 0;
  font-size: 17px;
  line-height: 1.5;
  color: var(--c-mist);
}

.page-about .origin-body p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--about-text-soft);
}

/* ---------- 流程：折叠组 ---------- */

.page-about .about-pipeline {
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .about-pipeline .accordion-item {
  border-top: 1px solid var(--line);
}

.page-about .about-pipeline .accordion-item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .accordion-trigger {
  width: 100%;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  align-items: center;
  column-gap: 12px;
  padding: 16px 4px;
  background: none;
  border: 0;
  color: var(--c-mist);
  text-align: left;
  cursor: pointer;
}

.page-about .pipe-step {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-orange);
}

.page-about .pipe-title {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  min-width: 0;
}

.page-about .pipe-when {
  color: var(--c-grayblue);
  font-size: 10px;
  white-space: nowrap;
}

.page-about .accordion-sign {
  position: relative;
  width: 12px;
  height: 12px;
  flex: none;
}

.page-about .accordion-sign::before,
.page-about .accordion-sign::after {
  content: "";
  position: absolute;
  background: var(--c-cyan);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.page-about .accordion-sign::before {
  left: 0;
  top: 5px;
  width: 12px;
  height: 1px;
}

.page-about .accordion-sign::after {
  top: 0;
  left: 5px;
  width: 1px;
  height: 12px;
}

.page-about .accordion-panel {
  max-height: none;
  overflow: visible;
  padding: 0 4px 20px 34px;
}

.page-about .accordion-panel p {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.74;
  color: var(--about-text-soft);
}

.page-about .accordion-trigger:hover .pipe-title,
.page-about .accordion-trigger:focus-visible .pipe-title {
  color: var(--c-orange);
}

/* ---------- 配图通用 ---------- */

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: linear-gradient(140deg, var(--c-layer) 0%, var(--c-steel) 100%);
  overflow: hidden;
  min-width: 0;
}

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

.page-about .about-figure--team img {
  aspect-ratio: 14 / 9;
}

.page-about .about-figure--venue img,
.page-about .about-figure--archive img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure .media-caption {
  display: block;
  padding: 12px 16px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--c-grayblue);
  border-top: 1px solid var(--line);
}

.page-about .about-figure--team {
  margin-top: clamp(20px, 3vw, 28px);
}

/* ---------- 分工：四列信息带 ---------- */

.page-about .team-band {
  display: grid;
  gap: 1px;
  margin-top: clamp(24px, 3.4vw, 34px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .team-cell {
  position: relative;
  background: var(--c-deep);
  padding: 22px 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.page-about .team-cell::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--c-orange), var(--c-amber));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 220ms var(--ease);
}

.page-about .team-cell:hover::before,
.page-about .team-cell:focus-within::before {
  transform: scaleX(1);
}

.page-about .team-tag {
  color: var(--c-orange);
}

.page-about .team-tag--cyan {
  color: var(--c-cyan);
}

.page-about .team-name {
  margin: 0;
  font-size: 18px;
  line-height: 1.4;
  color: var(--c-mist);
}

.page-about .team-desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--about-text-soft);
}

/* ---------- 覆盖 ---------- */

.page-about .about-chapter--coverage {
  position: relative;
}

.page-about .about-split {
  display: grid;
  gap: 26px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .about-split-main {
  min-width: 0;
}

.page-about .coverage-metrics {
  list-style: none;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .coverage-metric {
  background: rgba(5, 25, 43, 0.72);
  padding: 18px 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 7px;
  min-width: 0;
}

.page-about .coverage-num {
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: clamp(30px, 4.4vw, 44px);
  line-height: 0.94;
  letter-spacing: -0.02em;
  color: var(--c-mist);
}

.page-about .coverage-metric:nth-child(2) .coverage-num {
  color: var(--c-cyan);
}

.page-about .coverage-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  line-height: 1.5;
  color: var(--c-grayblue);
}

/* ---------- 伙伴 ---------- */

.page-about .partner-list {
  list-style: none;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .partner-item {
  background: rgba(10, 39, 64, 0.78);
  padding: 20px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  column-gap: 14px;
  row-gap: 8px;
  min-width: 0;
}

.page-about .partner-role {
  color: var(--c-cyan);
}

.page-about .partner-count {
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--c-orange);
}

.page-about .partner-item p {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--about-text-soft);
}

.page-about .about-figure--archive {
  margin-top: clamp(24px, 3.4vw, 34px);
}

/* ---------- 坚持 ---------- */

.page-about .principle-list {
  list-style: none;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
}

.page-about .principle-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 18px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
  min-width: 0;
}

.page-about .principle-item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .principle-no {
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--c-steel);
}

.page-about .principle-name {
  margin: 0;
  font-size: 17px;
  line-height: 1.5;
  color: var(--c-mist);
}

.page-about .principle-item p {
  margin: 8px 0 0;
  max-width: 40em;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--about-text-soft);
}

.page-about .about-cta {
  margin-top: clamp(30px, 4.4vw, 44px);
  padding: clamp(22px, 3.4vw, 32px);
  border: 1px solid var(--line);
  border-left: 3px solid var(--c-orange);
  background: linear-gradient(120deg, rgba(255, 106, 26, 0.07) 0%, rgba(5, 25, 43, 0) 62%);
}

.page-about .about-cta-text {
  margin: 0;
  max-width: 38em;
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--c-mist);
}

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

/* ---------- 滚动进入 ---------- */

.page-about [data-reveal] {
  opacity: 1;
}

.has-js .page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 240ms var(--ease), transform 240ms var(--ease);
}

.has-js .page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .origin-step {
    grid-template-columns: minmax(0, 200px) minmax(0, 1fr);
    align-items: center;
    column-gap: 26px;
    padding: 26px 24px 28px;
  }

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

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr);
    align-items: start;
    column-gap: 34px;
  }

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

  .page-about .about-figure--venue {
    margin-top: 4px;
  }

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

  .page-about .partner-item {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 10px;
  }

  .page-about .partner-item p {
    grid-column: auto;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body-inner {
    display: grid;
    grid-template-columns: var(--about-axis-w) minmax(0, 1fr);
    column-gap: var(--about-col-gap);
    align-items: start;
  }

  .page-about .about-axis {
    display: block;
    min-width: 0;
  }

  .page-about .axis-sticky {
    position: sticky;
    top: calc(var(--header-total) + 28px);
  }

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

@media (min-width: 1040px) {
  .page-about .team-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .axis-dot,
  .page-about .team-cell::before,
  .page-about .accordion-sign::before,
  .page-about .accordion-sign::after,
  .page-about .about-inline-link {
    transition: none;
  }

  .has-js .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}