.page-about {
  --ab-rule: rgba(246, 239, 227, 0.12);
  --ab-gap: clamp(20px, 3vw, 40px);
  display: block;
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding-top: 4px;
  margin-bottom: 22px;
}

.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--gray-600);
}

.page-about .crumbs li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--gray-600);
}

.page-about .crumbs a {
  color: var(--gray-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--fox-light);
  border-bottom-color: var(--fox-light);
}

.page-about .crumbs [aria-current="page"] {
  color: var(--cream-100);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: 6px 0 clamp(34px, 6vw, 76px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -80px 0 auto 0;
  height: 340px;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(680px 300px at 10% 0%, rgba(242, 97, 12, 0.17), transparent 68%),
    radial-gradient(520px 260px at 94% 6%, rgba(75, 224, 210, 0.07), transparent 72%);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--ab-gap);
  align-items: start;
}

.page-about h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(27px, 5.4vw, 52px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--cream-100);
  max-width: 22ch;
}

.page-about .about-lead {
  margin: 16px 0 0;
  font-size: clamp(16px, 1.6vw, 18.5px);
  line-height: 1.8;
  color: var(--cream-200);
  max-width: 62ch;
}

.page-about .about-sub {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--gray-400);
  max-width: 60ch;
}

.page-about .about-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

/* 速览面板 */
.page-about .about-facts {
  position: relative;
  background: var(--cream-100);
  color: var(--ink);
  padding: 20px 18px 30px;
  border: 1px solid var(--line-light);
  box-shadow: var(--shadow-panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .facts-title {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--ember);
}

.page-about .facts-title::after {
  content: "";
  display: block;
  width: 34px;
  height: 2px;
  margin-top: 8px;
  background: var(--fox);
}

.page-about .facts-list {
  margin: 8px 0 0;
}

.page-about .fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--line-light);
}

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

.page-about .fact dt {
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-soft);
}

.page-about .fact dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.01em;
}

/* ---------- 通用非对称分栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--ab-gap);
  align-items: start;
}

/* 定位区 */
.page-about .about-who .about-split-main p {
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--gray-400);
  max-width: 64ch;
}

.page-about .about-quote {
  color: var(--ink);
  border: 1px solid var(--line-light);
}

.page-about .quote-k {
  margin: 0 0 14px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--ember);
}

.page-about .quote-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .quote-list li {
  display: flex;
  gap: 10px;
  align-items: baseline;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .quote-list li + li {
  padding-top: 12px;
  border-top: 1px solid var(--line-light);
}

.page-about .quote-list .mono {
  flex: none;
  font-size: 13px;
  font-weight: 700;
  color: var(--fox);
}

/* ---------- 三条主线 ---------- */
.page-about .line-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: clamp(22px, 3vw, 36px);
}

.page-about .line-card {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--char-800);
  border: 1px solid var(--line-dark);
  border-top: 3px solid var(--fox);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .line-card.line-b {
  border-top-color: var(--ember);
}

.page-about .line-card.line-c {
  border-top-color: var(--fox-light);
}

.page-about .line-card:hover {
  transform: translateY(-4px);
  border-color: rgba(242, 97, 12, 0.45);
}

.page-about .line-card.line-b:hover {
  border-color: rgba(214, 64, 42, 0.5);
}

.page-about .line-card.line-c:hover {
  border-color: rgba(255, 138, 61, 0.5);
}

.page-about .line-idx {
  margin: 0 0 12px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--fox);
}

.page-about .line-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  color: var(--cream-100);
  letter-spacing: -0.01em;
}

.page-about .line-card p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.76;
  color: var(--gray-400);
}

.page-about .line-link {
  margin: 0;
}

.page-about .line-link a {
  font-size: 14px;
  font-weight: 600;
  color: var(--fox-light);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 138, 61, 0.4);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .line-link a:hover,
.page-about .line-link a:focus-visible {
  color: var(--fox);
  border-bottom-color: var(--fox);
}

/* ---------- 时间线 ---------- */
.page-about .about-tl-media {
  margin: clamp(22px, 3vw, 34px) 0 clamp(28px, 4vw, 46px);
}

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

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(
    180deg,
    rgba(90, 75, 68, 0.95) 0%,
    var(--ember) 38%,
    var(--fox) 74%,
    var(--fox-light) 100%
  );
}

.page-about .tl-node {
  position: relative;
  padding-left: 38px;
  margin-bottom: 18px;
}

.page-about .tl-node:last-child {
  margin-bottom: 0;
}

.page-about .tl-dot {
  position: absolute;
  left: 0;
  top: 17px;
  width: 18px;
  height: 18px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--char-900);
  border: 2px solid var(--ember);
}

.page-about .tl-node:nth-child(3) .tl-dot {
  border-color: var(--fox);
}

.page-about .tl-node:nth-child(4) .tl-dot {
  background: var(--fox);
  border-color: var(--fox-light);
  box-shadow: 0 0 0 4px rgba(242, 97, 12, 0.18);
}

.page-about .tl-card {
  background: var(--char-800);
  border: 1px solid var(--line-dark);
  border-left: 3px solid var(--fox);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .tl-card:hover {
  border-left-color: var(--fox-light);
  background: #221B18;
}

.page-about .tl-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  width: 100%;
  padding: 15px 16px;
  background: transparent;
  border: 0;
  font: inherit;
  color: inherit;
  text-align: left;
  cursor: pointer;
}

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

.page-about .tl-ver {
  flex: none;
  padding: 2px 7px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--fox);
  border: 1px solid rgba(242, 97, 12, 0.4);
}

.page-about .tl-name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  color: var(--cream-100);
  letter-spacing: -0.01em;
}

.page-about .tl-year {
  margin-left: auto;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--gray-400);
}

.page-about .tl-toggle {
  flex: none;
  position: relative;
  width: 14px;
  height: 14px;
  margin-left: 8px;
}

.page-about .tl-toggle::before,
.page-about .tl-toggle::after {
  content: "";
  position: absolute;
  background: var(--gray-400);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .tl-toggle::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-about .tl-toggle::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
}

.page-about .tl-head[aria-expanded="true"] .tl-toggle::after {
  transform: scaleY(0);
}

.page-about .tl-head:hover .tl-toggle::before,
.page-about .tl-head:hover .tl-toggle::after,
.page-about .tl-head:focus-visible .tl-toggle::before,
.page-about .tl-head:focus-visible .tl-toggle::after {
  background: var(--fox-light);
}

.page-about .tl-body {
  padding: 0 16px 18px;
  border-top: 1px solid var(--line-dark);
}

.page-about .tl-body p {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--gray-400);
}

.page-about .tl-points {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .tl-points li {
  position: relative;
  padding-left: 17px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--cream-200);
}

.page-about .tl-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  background: var(--fox);
  transform: rotate(45deg);
}

/* ---------- 团队 ---------- */
.page-about .about-team .about-split-main p {
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--gray-400);
  max-width: 64ch;
}

.page-about .role-list {
  list-style: none;
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .role-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
  padding: 13px 14px;
  background: var(--char-800);
  border-left: 2px solid var(--ember);
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--gray-400);
}

.page-about .role-tag {
  flex: none;
  padding: 2px 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--fox);
  border: 1px solid rgba(242, 97, 12, 0.35);
}

/* ---------- 标准 ---------- */
.page-about .about-standard .about-split-main p {
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--gray-400);
  max-width: 64ch;
}

/* ---------- 规模 ---------- */
.page-about .scale-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: clamp(22px, 3vw, 36px);
}

.page-about .scale-cell {
  padding: 20px 16px 22px;
  background: linear-gradient(158deg, var(--char-800) 0%, var(--char-900) 100%);
  border: 1px solid var(--line-dark);
  border-top: 2px solid var(--fox);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .scale-cell:hover {
  transform: translateY(-4px);
  border-color: rgba(246, 239, 227, 0.26);
}

.page-about .scale-cell:nth-child(2) {
  border-top-color: var(--ember);
}

.page-about .scale-cell:nth-child(4) {
  border-top-color: var(--cyan);
}

.page-about .scale-cell:nth-child(6) {
  border-top-color: var(--amber);
}

.page-about .scale-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.4vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cream-100);
}

.page-about .scale-label {
  margin: 10px 0 0;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--fox-light);
}

.page-about .scale-desc {
  margin: 6px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--gray-400);
}

/* ---------- 合作 ---------- */
.page-about .about-partners .about-split-main p {
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--gray-400);
  max-width: 64ch;
}

.page-about .about-partner-card {
  padding: 20px 18px 22px;
  background: var(--char-800);
  border: 1px solid var(--line-dark);
  border-bottom: 2px solid var(--fox);
}

.page-about .about-partner-card + .about-partner-card {
  margin-top: 14px;
}

.page-about .partner-k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  color: var(--fox);
}

.page-about .partner-l {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--gray-400);
}

.page-about .link-arrow {
  display: inline-block;
  margin-top: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--fox-light);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 138, 61, 0.4);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .link-arrow:hover,
.page-about .link-arrow:focus-visible {
  color: var(--fox);
  border-bottom-color: var(--fox);
}

/* ---------- 下一步 ---------- */
.page-about .next-block {
  position: relative;
  padding: clamp(24px, 4vw, 42px) clamp(20px, 3.4vw, 46px);
  background: var(--char-800);
  border: 1px solid var(--line-dark);
  overflow: hidden;
}

.page-about .next-block::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: linear-gradient(90deg, var(--fox) 0%, var(--ember) 46%, var(--amber) 100%);
}

.page-about .next-block::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -90px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(242, 97, 12, 0.18) 0%, transparent 68%);
  pointer-events: none;
}

.page-about .next-block p {
  position: relative;
  margin: 16px 0 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--gray-400);
  max-width: 76ch;
}

.page-about .next-links {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

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

  .page-about .scale-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-split-rev {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
  }

  .page-about .about-split-rev .about-split-side {
    order: -1;
  }

  .page-about .tl-node {
    padding-left: 46px;
  }

  .page-about .tl-head {
    padding: 17px 20px;
  }

  .page-about .tl-body {
    padding: 0 20px 20px;
  }

  .page-about .tl-name {
    font-size: 19px;
  }
}
<<<END>>>