.page-about {
  --about-card-bg: rgba(16, 52, 92, .55);
  --about-ink-soft: rgba(11, 31, 58, .78);
  --about-cream-line: rgba(237, 230, 214, .35);
  background: var(--ink);
  color: var(--paper);
  overflow-x: hidden;
}

.page-about .wrap {
  width: 100%;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(20px, 3vw, 34px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .breadcrumb a {
  color: var(--neon);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  text-decoration: underline;
}

.page-about .crumb-sep {
  color: var(--muted-soft);
}

/* ---------- 首屏声明 ---------- */
.page-about .about-masthead {
  position: relative;
  padding: clamp(22px, 4vw, 44px) 0 clamp(36px, 6vw, 76px);
  background: var(--ink-deep);
  border-bottom: 4px solid var(--stone);
}

.page-about .about-masthead::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--field) 0 62%, var(--neon) 62% 78%, var(--clay) 78% 100%);
}

.page-about .masthead-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 54px);
}

.page-about .masthead-main h1 {
  margin: 12px 0 18px;
  font-family: var(--font-display);
  font-size: clamp(36px, 8vw, 76px);
  font-weight: 700;
  line-height: .98;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--neon);
}

.page-about .masthead-lede {
  max-width: 62ch;
  margin: 0 0 18px;
  font-size: clamp(15px, 1.4vw, 18px);
  line-height: 1.9;
  color: var(--paper);
}

.page-about .masthead-sub {
  margin: 0;
  padding-left: 14px;
  border-left: 3px solid var(--field);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .masthead-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.page-about .masthead-aside {
  padding: clamp(20px, 3vw, 30px);
  background: var(--panel);
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow-hard);
}

.page-about .aside-label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-toc {
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
  counter-reset: toc;
}

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

.page-about .about-toc a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 11px 0;
  font-size: 15px;
  color: var(--paper);
  text-decoration: none;
  transition: color .18s ease, padding-left .18s ease;
}

.page-about .about-toc a::before {
  counter-increment: toc;
  content: counter(toc, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--neon);
}

.page-about .about-toc a:hover {
  color: var(--neon);
  padding-left: 6px;
}

.page-about .aside-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
  padding-top: 18px;
  border-top: 2px solid var(--field);
}

.page-about .aside-stats dt {
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .12em;
  color: var(--muted);
}

.page-about .aside-stats dd {
  margin: 0;
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 700;
  color: var(--neon);
}

/* ---------- 章节基座 ---------- */
.page-about .section {
  padding: clamp(46px, 8vw, 104px) 0;
}

.page-about .section-head {
  max-width: 780px;
  margin-bottom: clamp(26px, 4vw, 50px);
}

.page-about .section-head h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(25px, 4.4vw, 48px);
  font-weight: 700;
  line-height: 1.08;
  color: var(--paper);
}

.page-about .media-frame {
  display: block;
  margin: 0;
  overflow: hidden;
  background: var(--ink-deep);
}

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

/* ---------- 01 起点 ---------- */
.page-about .origin {
  background: var(--ink);
}

.page-about .origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .rot-note {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--moss);
}

.page-about .origin-body h2 {
  margin: 10px 0 20px;
  font-family: var(--font-display);
  font-size: clamp(25px, 4.4vw, 48px);
  line-height: 1.08;
  color: var(--paper);
}

.page-about .origin-body p {
  max-width: 68ch;
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--muted);
}

.page-about .origin-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 32px;
}

.page-about .origin-card {
  padding: 22px 20px;
  background: var(--about-card-bg);
  border: 2px solid var(--line-strong);
  border-top: 4px solid var(--field);
}

.page-about .origin-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 22px;
  color: var(--paper);
}

.page-about .origin-card p {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .origin-card a {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-about .origin-card a:hover {
  color: var(--paper);
}

.page-about .origin-figure {
  margin-top: clamp(28px, 4vw, 48px);
}

/* ---------- 02 时间线 ---------- */
.page-about .timeline-section {
  background: var(--ink-deep);
  border-top: 2px solid var(--line-strong);
  border-bottom: 2px solid var(--line-strong);
}

.page-about .timeline {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 3px solid var(--field);
}

.page-about .timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding: 22px 0 22px 22px;
}

.page-about .timeline-item + .timeline-item {
  border-top: 1px dashed var(--line);
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 28px;
  width: 13px;
  height: 13px;
  background: var(--ink-deep);
  border: 3px solid var(--field);
}

.page-about .timeline-item--now::before {
  background: var(--neon);
  border-color: var(--neon);
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--moss);
}

.page-about .timeline-item--now .tl-year {
  color: var(--neon);
}

.page-about .tl-body h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 21px;
  color: var(--paper);
}

.page-about .tl-body p {
  margin: 0;
  max-width: 66ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 03 团队 ---------- */
.page-about .team-section {
  background: var(--ink);
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 46px);
  align-items: start;
}

.page-about .team-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: var(--line-strong);
  border: 2px solid var(--line-strong);
}

.page-about .stat-block {
  padding: 20px 18px;
  background: var(--panel);
}

.page-about .stat-block--total {
  grid-column: 1 / -1;
  background: var(--field);
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.2vw, 46px);
  font-weight: 700;
  line-height: 1;
  color: var(--neon);
}

.page-about .stat-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .stat-block--total .stat-num {
  color: var(--cream);
}

.page-about .stat-block--total .stat-label {
  color: var(--cream);
  opacity: .82;
}

.page-about .team-note {
  max-width: 80ch;
  margin: clamp(26px, 3vw, 38px) 0 0;
  padding-left: 16px;
  border-left: 3px solid var(--moss);
  font-size: 15px;
  line-height: 1.9;
  color: var(--muted);
}

/* ---------- 04 流程 ---------- */
.page-about .workflow-section {
  background: var(--cream);
  color: var(--ink);
}

.page-about .workflow-section .eyebrow {
  color: var(--clay);
}

.page-about .workflow-section .section-head h2 {
  color: var(--ink);
}

.page-about .workflow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .workflow-step {
  padding: 20px 18px 24px;
  background: var(--paper);
  border: 3px solid var(--ink);
  box-shadow: var(--shadow-soft);
}

.page-about .step-idx {
  display: inline-block;
  padding: 4px 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  background: var(--ink);
  color: var(--neon);
}

.page-about .workflow-step h3 {
  margin: 14px 0 8px;
  font-family: var(--font-display);
  font-size: 21px;
  color: var(--ink);
}

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

/* ---------- 05 生态 ---------- */
.page-about .partners-section {
  background: var(--ink);
}

.page-about .partners-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 46px);
  align-items: start;
}

.page-about .partner-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .partner-item {
  padding: 14px 0 16px 18px;
  border-left: 4px solid var(--field);
  border-bottom: 1px solid var(--line);
  transition: border-color .2s ease, background-color .2s ease, padding-left .2s ease;
}

.page-about .partner-item:hover {
  padding-left: 24px;
  border-left-color: var(--neon);
  background: rgba(16, 52, 92, .7);
}

.page-about .partner-item strong {
  display: block;
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .partner-item span {
  display: block;
  margin-top: 6px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .honor-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: clamp(26px, 4vw, 46px);
  padding: 18px 20px;
  border: 2px solid var(--neon);
  background: rgba(215, 255, 63, .08);
}

.page-about .honor-strip p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--paper);
}

/* ---------- 06 合作 ---------- */
.page-about .cooperate-section {
  background: var(--field);
  color: var(--cream);
}

.page-about .cooperate-section .eyebrow {
  color: var(--neon);
}

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

.page-about .coop-intro h2 {
  margin: 10px 0 18px;
  font-family: var(--font-display);
  font-size: clamp(25px, 4.4vw, 46px);
  line-height: 1.1;
  color: var(--cream);
}

.page-about .coop-intro p {
  max-width: 60ch;
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--cream);
}

.page-about .coop-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 22px;
}

.page-about .coop-note {
  margin: 0;
  padding-top: 16px;
  border-top: 1px solid var(--about-cream-line);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.8;
  color: rgba(237, 230, 214, .84);
}

.page-about .coop-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .coop-item {
  padding: 18px 20px 20px;
  background: rgba(11, 31, 58, .42);
  border: 2px solid var(--about-cream-line);
  box-shadow: var(--shadow-soft);
  transition: transform .18s ease, box-shadow .18s ease;
}

.page-about .coop-item:hover {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 var(--ink);
}

.page-about .coop-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--neon);
}

.page-about .coop-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--cream);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .origin-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .masthead-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .origin-grid {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 40px;
  }

  .page-about .rot-note {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    transform: rotate(180deg);
    letter-spacing: .34em;
  }

  .page-about .timeline-item {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 40px;
    padding: 30px 0 30px 38px;
  }

  .page-about .timeline-item::before {
    top: 36px;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .partners-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }

  .page-about .coop-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

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

@media (min-width: 1100px) {
  .page-about .workflow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc a,
  .page-about .partner-item,
  .page-about .coop-item {
    transition: none;
  }

  .page-about .coop-item:hover {
    transform: none;
  }
}