.page-about {
  --about-narrow: 38em;
  --about-ease: 180ms ease;
}

/* ===================== 面包屑 ===================== */
.page-about .breadcrumb {
  padding-block: 16px 0;
}

/* ===================== 首屏 ===================== */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(32px, 5vw, 64px) clamp(56px, 8vw, 104px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -40px;
  right: -60px;
  width: clamp(220px, 34vw, 520px);
  height: clamp(220px, 34vw, 520px);
  background: var(--indigo-2);
  clip-path: polygon(100% 0, 100% 100%, 0 0);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: var(--bw);
  background: var(--line-dark);
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 32px;
  grid-template-columns: 1fr;
}

.page-about .about-kicker {
  margin-bottom: 18px;
}

.page-about .about-h1 {
  margin: 0 0 24px;
  color: var(--snow);
  font-size: clamp(34px, 6.4vw, 68px);
  line-height: 1.08;
}

.page-about .about-h1 br {
  display: none;
}

.page-about .about-lead {
  max-width: 34em;
  margin: 0 0 28px;
  color: var(--snow-86);
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.9;
}

.page-about .about-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-hero-anchor {
  display: grid;
  gap: 14px;
  border-top: var(--bw) solid var(--line-dark-2);
  padding-top: 22px;
}

.page-about .about-anchor-item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-block: 4px;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-anchor-item:last-child {
  border-bottom: none;
}

.page-about .about-anchor-num {
  flex: 0 0 auto;
  min-width: 3.2em;
  font-size: clamp(34px, 4.4vw, 46px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .about-anchor-num em {
  font-style: normal;
  font-size: .6em;
  color: var(--orange);
  margin-left: 2px;
}

.page-about .about-anchor-label {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--gray);
}

/* ===================== 章节通用 ===================== */
.page-about .about-sec {
  position: relative;
}

.page-about .about-sec--dark {
  background: var(--indigo);
  color: var(--snow);
}

.page-about .about-sec-head {
  display: flex;
  align-items: baseline;
  gap: 18px;
  margin-bottom: 28px;
  padding-bottom: 14px;
  border-bottom: var(--bw) solid var(--line-dark-2);
  flex-wrap: wrap;
}

.page-about .section--cream .about-sec-head {
  border-bottom-color: var(--line-cream);
}

.page-about .about-sec-num {
  font-size: clamp(30px, 4.6vw, 48px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .section--cream .about-sec-num {
  color: var(--orange);
}

.page-about .about-sec-title {
  margin: 0;
  font-size: clamp(24px, 3.2vw, 36px);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: inherit;
  transform: scaleY(.96);
  transform-origin: left bottom;
}

.page-about .about-sec-cols {
  display: grid;
  gap: 28px;
  grid-template-columns: 1fr;
}

.page-about .about-sec-col--main {
  max-width: var(--about-narrow);
}

.page-about .prose,
.page-about .prose--cream {
  max-width: var(--about-narrow);
}

.page-about .about-inline-links {
  margin-top: 24px;
}

/* ===================== 01 起点 ===================== */
.page-about .about-fact-card {
  border: var(--bw) solid var(--ink);
  background: var(--cream-2);
  padding: 20px 18px 22px;
  box-shadow: var(--shadow-cream);
}

.page-about .about-fact-card + .about-fact-card {
  margin-top: 18px;
}

.page-about .about-fact-label {
  margin: 0 0 8px;
  color: var(--ink);
  opacity: .7;
}

.page-about .about-fact-value {
  margin: 0;
  font-size: clamp(34px, 4vw, 44px);
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--ink);
  line-height: 1;
}

.page-about .about-fact-desc {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
  opacity: .82;
}

.page-about .about-fact-list {
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-fact-list li {
  position: relative;
  padding: 8px 0 8px 20px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
  border-bottom: 1px solid var(--line-cream);
}

.page-about .about-fact-list li:last-child {
  border-bottom: none;
}

.page-about .about-fact-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.1em;
  width: 10px;
  height: 2px;
  background: var(--orange);
}

/* ===================== 02 字段标准 ===================== */
.page-about .about-std-figure {
  margin: 0;
  border: var(--bw) solid var(--line-dark-2);
  box-shadow: var(--shadow-dark);
}

.page-about .about-std-cap,
.page-about .about-flow-cap,
.page-about .about-history-cap {
  margin-top: 10px;
  color: var(--gray);
}

.page-about .section--cream .about-flow-cap {
  color: var(--gray);
}

.page-about .about-std-list {
  margin: 20px 0 0;
  padding: 0;
  border-top: var(--bw) solid var(--line-dark-2);
}

.page-about .about-std-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-std-item:last-child {
  border-bottom: none;
}

.page-about .about-std-title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 8px;
  font-size: clamp(17px, 1.6vw, 20px);
  font-weight: 700;
  color: var(--snow);
}

.page-about .about-std-title::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  background: var(--cyan);
  flex: 0 0 auto;
}

.page-about .about-std-desc {
  margin: 0 0 0 20px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--snow-86);
}

/* ===================== 03 流程 ===================== */
.page-about .about-flow-figure {
  margin: 0;
  border: var(--bw) solid var(--ink);
  box-shadow: var(--shadow-cream);
}

/* ===================== 04 团队 ===================== */
.page-about .about-team-lead {
  margin-bottom: 32px;
}

.page-about .about-team-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: 1fr;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: team;
}

.page-about .about-team-card {
  position: relative;
  border: var(--bw) solid var(--snow);
  background: var(--indigo-2);
  padding: 26px 20px 28px;
  box-shadow: 6px 6px 0 rgba(11, 20, 48, .9);
  transition: transform var(--about-ease), box-shadow var(--about-ease), border-color var(--about-ease);
}

.page-about .about-team-card:hover,
.page-about .about-team-card:focus-within {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-team-num {
  display: block;
  font-size: clamp(38px, 4.2vw, 52px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--orange);
  margin-bottom: 8px;
}

.page-about .about-team-name {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--snow);
  letter-spacing: -0.01em;
}

.page-about .about-team-desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--snow-86);
}

/* ===================== 05 时间轴 ===================== */
.page-about .about-history-figure {
  margin: 0 0 36px;
  border: var(--bw) solid var(--ink);
  box-shadow: var(--shadow-cream);
}

.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
  border-left: var(--bw) solid var(--ink);
}

.page-about .about-tl-item {
  position: relative;
  padding: 0 0 28px 4px;
}

.page-about .about-tl-item:last-child {
  padding-bottom: 0;
}

.page-about .about-tl-dot {
  position: absolute;
  left: -33px;
  top: 6px;
  width: 13px;
  height: 13px;
  background: var(--cream);
  border: var(--bw) solid var(--ink);
  transition: background var(--about-ease), transform var(--about-ease);
}

.page-about .about-tl-item:hover .about-tl-dot,
.page-about .about-tl-item:focus-within .about-tl-dot {
  background: var(--orange);
  transform: scale(1.2);
}

.page-about .about-tl-year {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--orange);
  margin-bottom: 6px;
}

.page-about .about-tl-title {
  margin: 0 0 8px;
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-tl-desc {
  margin: 0;
  max-width: 42em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink);
  opacity: .84;
}

/* ===================== 06 覆盖范围 ===================== */
.page-about .about-cover-lead {
  margin-bottom: 32px;
}

.page-about .about-cover-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .about-cover-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px 20px;
  border: var(--bw) solid var(--line-dark-2);
  background: var(--indigo-2);
  transition: border-color var(--about-ease), transform var(--about-ease);
}

.page-about .about-cover-item:hover {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .about-cover-item--wide {
  grid-column: span 2;
  flex-direction: row;
  align-items: baseline;
  gap: 14px;
}

.page-about .about-cover-num {
  font-size: clamp(30px, 3.6vw, 42px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .about-cover-item--wide .about-cover-num {
  min-width: 1.6em;
}

.page-about .about-cover-num em {
  font-style: normal;
  font-size: .6em;
  color: var(--orange);
  margin-left: 2px;
}

.page-about .about-cover-label {
  font-size: 13.5px;
  letter-spacing: .04em;
  color: var(--gray);
}

/* ===================== 07 合作入口 ===================== */
.page-about .about-sec--closing {
  border-top: var(--bw) solid var(--ink);
}

.page-about .about-closing-grid {
  display: grid;
  gap: 32px;
  grid-template-columns: 1fr;
}

.page-about .about-closing-kicker {
  color: var(--orange);
}

.page-about .about-closing-title {
  margin: 8px 0 20px;
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.22;
  color: var(--ink);
  max-width: 18em;
}

.page-about .about-closing-lede {
  margin: 0 0 28px;
  max-width: 34em;
}

.page-about .about-closing-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-btn-ghost-dark {
  border-color: var(--ink);
  color: var(--ink);
}

.page-about .about-btn-ghost-dark:hover,
.page-about .about-btn-ghost-dark:focus-visible {
  background: var(--ink);
  color: var(--cream);
}

.page-about .about-closing-card {
  border: var(--bw) solid var(--ink);
  background: var(--cream-2);
  padding: 24px 22px 26px;
  box-shadow: var(--shadow-cream);
}

.page-about .about-closing-label {
  margin: 0 0 10px;
  color: var(--ink);
  opacity: .68;
}

.page-about .about-closing-desc {
  margin: 0 0 20px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink);
  opacity: .86;
}

.page-about .about-closing-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 0;
}

.page-about .about-closing-links a {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
  transition: color var(--about-ease);
}

.page-about .about-closing-links a:hover,
.page-about .about-closing-links a:focus-visible {
  color: var(--orange);
}

/* ===================== 进入动效 ===================== */
.page-about [data-reveal] {
  transition: opacity 120ms linear, transform 120ms linear;
}

.page-about [data-reveal][data-reveal-pending] {
  opacity: 0;
  transform: translateY(6px);
}

.page-about [data-reveal][data-revealed] {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about [data-reveal][data-reveal-pending],
  .page-about [data-reveal][data-revealed] {
    transition: none;
    transform: none;
    opacity: 1;
  }
  .page-about .about-team-card,
  .page-about .about-cover-item,
  .page-about .about-tl-dot {
    transition: none;
  }
}

/* ===================== 窄屏适配 ===================== */
@media (max-width: 599px) {
  .page-about .about-hero::before {
    top: 0;
    right: 0;
    width: 52vw;
    height: 52vw;
  }
  .page-about .about-anchor-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
  .page-about .about-anchor-num {
    min-width: 0;
  }
  .page-about .about-cover-item--wide {
    grid-column: span 1;
    flex-direction: column;
    align-items: flex-start;
  }
  .page-about .about-timeline {
    padding-left: 18px;
  }
  .page-about .about-tl-dot {
    left: -25px;
    width: 11px;
    height: 11px;
  }
}

/* ===================== 桌面网格 ===================== */
@media (min-width: 760px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: 48px;
    align-items: end;
  }
  .page-about .about-h1 br {
    display: inline;
  }
  .page-about .about-team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-cover-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-cover-item--wide {
    grid-column: span 3;
  }
}

@media (min-width: 960px) {
  .page-about .about-sec-cols {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 40px;
    align-items: start;
  }
  .page-about .about-sec-cols--flip {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
  }
  .page-about .about-sec-col--side {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }
  .page-about .about-std-figure {
    margin-top: 4px;
  }
  .page-about .about-history-figure {
    margin-bottom: 48px;
  }
  .page-about .about-closing-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }
}
<<<END>>>