.page-about {
  --about-pad: clamp(20px, 5vw, 56px);
  --about-space: clamp(56px, 8vw, 104px);
  --about-radius: 2px;
}

.page-about .container {
  width: 100%;
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: var(--about-pad);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(36px, 5vw, 72px) clamp(32px, 5vw, 64px);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, var(--bg-alt) 0%, transparent 82%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px),
    linear-gradient(180deg, var(--line-soft) 1px, transparent 1px);
  background-size: 96px 96px;
  pointer-events: none;
}

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

.page-about .about-hero__kicker {
  margin: clamp(20px, 3vw, 36px) 0 0;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--accent-text);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(34px, 6.4vw, 74px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--heading);
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 46ch;
  font-size: clamp(16px, 1.8vw, 18px);
  line-height: 1.75;
  color: var(--text-soft);
}

.page-about .about-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(28px, 4vw, 48px);
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 14px;
  border: 1px solid var(--line);
  color: var(--text-soft);
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-index__link .u-mono {
  font-size: 11px;
  color: var(--blue);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--heading);
  border-color: var(--blue);
  background: var(--bg);
}

/* ---------- 章节 ---------- */

.page-about .about-section {
  padding-block: var(--about-space);
  border-bottom: 1px solid var(--line-soft);
}

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

/* ---------- 档案资料卡 ---------- */

.page-about .dossier-card {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  padding: 26px 22px 28px;
  background: var(--surface);
  border: 1px solid var(--line);
}

.page-about .dossier-card::after {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 72px;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}

.page-about .dossier-card__num {
  font-size: clamp(30px, 5vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.05em;
  color: var(--blue);
}

.page-about .dossier-card__tag {
  align-self: flex-start;
  margin: 0 0 12px;
}

.page-about .dossier-card__title {
  margin: 0 0 14px;
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--heading);
}

.page-about .dossier-card__text {
  margin: 0 0 12px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-soft);
  max-width: 62ch;
}

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

/* ---------- 首章图文 ---------- */

.page-about .about-lead {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  margin-top: clamp(32px, 5vw, 56px);
  align-items: start;
}

.page-about .about-lead__text p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-lead__linkline {
  margin-top: 22px;
}

.page-about .about-lead__link,
.page-about .about-split__link {
  display: inline-block;
  padding-bottom: 3px;
  border-bottom: 2px solid var(--cyan);
  color: var(--heading);
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-lead__link:hover,
.page-about .about-lead__link:focus-visible,
.page-about .about-split__link:hover,
.page-about .about-split__link:focus-visible {
  color: var(--blue);
  border-bottom-color: var(--blue);
}

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

.page-about .figure-frame__media {
  overflow: hidden;
  display: block;
}

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

.page-about .figure-frame__cap {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-soft);
}

/* ---------- 数字概览 ---------- */

.page-about .stat-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(36px, 6vw, 72px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .stat-row__item {
  padding: 26px clamp(18px, 3vw, 30px) 30px;
  background: var(--bg);
}

.page-about .stat-row__num {
  display: block;
  font-size: clamp(48px, 9vw, 82px);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.05em;
  color: var(--blue);
}

.page-about .stat-row__unit {
  display: inline-block;
  margin-top: 8px;
  padding: 2px 9px;
  border: 1px solid var(--line);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-soft);
}

.page-about .stat-row__note {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-soft);
}

/* ---------- 岗位卡 ---------- */

.page-about .role-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: clamp(30px, 5vw, 52px);
}

.page-about .role-card {
  position: relative;
  padding: 0 22px 26px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-top: 3px solid var(--blue);
}

.page-about .role-card__tab {
  display: inline-block;
  margin: -1px 0 20px -22px;
  padding: 7px 14px;
  background: var(--blue);
  color: #FFFFFF;
  font-size: 11px;
  letter-spacing: 0.12em;
  line-height: 1.2;
}

.page-about .role-card__title {
  margin: 0 0 12px;
  font-family: var(--sans);
  font-weight: 800;
  font-size: 20px;
  line-height: 1.35;
  color: var(--heading);
}

.page-about .role-card__text {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
}

.page-about .role-card__text--soft {
  margin-bottom: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  color: var(--text-soft);
  font-size: 14px;
}

/* ---------- 流水线 ---------- */

.page-about .flow-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: clamp(34px, 5vw, 56px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .flow-list__item {
  position: relative;
  padding: 22px 0 22px 20px;
  border-bottom: 1px solid var(--line-soft);
  border-left: 2px solid var(--moss);
}

.page-about .flow-list__num {
  display: block;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--moss);
}

.page-about .flow-list__title {
  margin: 6px 0 8px;
  font-family: var(--sans);
  font-weight: 800;
  font-size: 18px;
  color: var(--heading);
}

.page-about .flow-list__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-soft);
}

/* ---------- 折叠 ---------- */

.page-about .fold {
  margin-top: clamp(26px, 4vw, 40px);
  border: 1px solid var(--line);
  background: var(--bg-alt);
}

.page-about .fold__summary {
  position: relative;
  padding: 16px 52px 16px 20px;
  cursor: pointer;
  list-style: none;
  font-weight: 700;
  font-size: 15px;
  color: var(--heading);
}

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

.page-about .fold__summary::after {
  content: "+";
  position: absolute;
  top: 50%;
  right: 20px;
  transform: translateY(-50%);
  font-family: var(--mono);
  font-size: 20px;
  line-height: 1;
  color: var(--blue);
}

.page-about .fold[open] .fold__summary::after {
  content: "−";
}

.page-about .fold__summary:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: -2px;
}

.page-about .fold__body {
  padding: 4px 20px 20px;
  border-top: 1px solid var(--line);
}

.page-about .fold__body p {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-soft);
}

/* ---------- 横向图 ---------- */

.page-about .about-banner {
  margin-top: clamp(32px, 5vw, 56px);
}

.page-about .about-banner__media {
  aspect-ratio: 3 / 2;
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline-banner {
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .about-timeline-banner__media {
  aspect-ratio: 16 / 6;
}

.page-about .timeline {
  position: relative;
  margin-top: clamp(34px, 5vw, 56px);
  padding-left: 30px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 0;
  width: 1px;
  background: var(--line);
}

.page-about .timeline__node {
  position: relative;
  padding-bottom: clamp(26px, 4vw, 40px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

.page-about .timeline__node::before {
  content: "";
  position: absolute;
  top: 12px;
  left: -34px;
  width: 9px;
  height: 9px;
  background: var(--moss);
  box-shadow: 0 0 0 4px var(--bg);
}

.page-about .timeline__node--current::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px var(--bg), 0 0 12px 2px rgba(0, 229, 195, 0.5);
}

.page-about .timeline__ver {
  display: inline-block;
  margin-right: 12px;
  padding: 2px 8px;
  background: var(--bg-alt);
  border: 1px solid var(--line);
  font-size: 12px;
  color: var(--heading);
}

.page-about .timeline__year {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--text-soft);
}

.page-about .timeline__title {
  margin: 10px 0 8px;
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.4;
  color: var(--heading);
}

.page-about .timeline__text {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .timeline__foot {
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 16px 18px;
  border-left: 3px solid var(--orange);
  background: var(--bg-alt);
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-soft);
}

/* ---------- 合作生态 ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(30px, 5vw, 52px);
  align-items: start;
}

.page-about .about-split__title {
  margin: 0 0 14px;
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(20px, 2.8vw, 26px);
  line-height: 1.35;
  color: var(--heading);
}

.page-about .about-split__main p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-split__linkline {
  margin-top: 22px;
}

.page-about .partner-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .partner-list__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  align-items: baseline;
  padding: 18px 4px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .partner-list__num {
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--orange);
}

.page-about .partner-list__label {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-soft);
}

/* ---------- 收尾 ---------- */

.page-about .cta-panel {
  position: relative;
  overflow: hidden;
  padding: clamp(30px, 5vw, 56px);
  background: linear-gradient(135deg, var(--blue) 0%, var(--blue-deep) 62%, var(--charcoal) 100%);
  color: #FFFFFF;
}

.page-about .cta-panel::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 42%;
  height: 100%;
  background-image: linear-gradient(180deg, rgba(255, 255, 255, 0.16) 1px, transparent 1px);
  background-size: 100% 18px;
  opacity: 0.6;
  pointer-events: none;
}

.page-about .cta-panel__kicker {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .cta-panel__title {
  margin: 14px 0 0;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(26px, 4.4vw, 44px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: #FFFFFF;
}

.page-about .cta-panel__text {
  margin: 18px 0 0;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.86);
}

.page-about .cta-panel__list {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .cta-panel__list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.92);
}

.page-about .cta-panel__list li::before {
  content: "";
  position: absolute;
  top: 9px;
  left: 0;
  width: 8px;
  height: 8px;
  background: var(--cyan);
}

.page-about .cta-panel__actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .cta-panel .btn--ghost {
  color: #FFFFFF;
  border-color: var(--cyan);
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .stat-row {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .flow-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 860px) {
  .page-about .dossier-card {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 0;
    padding: 34px 36px 34px 28px;
  }

  .page-about .dossier-card__num {
    padding-top: 2px;
  }

  .page-about .about-lead {
    grid-template-columns: 7fr 5fr;
  }

  .page-about .about-lead__media {
    margin-top: 12px;
  }

  .page-about .role-grid {
    grid-template-columns: 5fr 4fr 3fr;
    gap: 22px;
    align-items: start;
  }

  .page-about .role-card:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .role-card:nth-child(3) {
    margin-top: 52px;
  }

  .page-about .flow-list {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-split {
    grid-template-columns: 8fr 4fr;
  }

  .page-about .about-timeline-banner__media {
    aspect-ratio: 16 / 5;
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero__lead {
    font-size: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about .timeline__node,
  .page-about .about-index__link {
    transition: none;
  }

  .page-about .timeline__node--current::before {
    box-shadow: 0 0 0 4px var(--bg);
  }
}