.page-about {
  --about-line: rgba(221, 228, 238, 0.14);
  --about-line-strong: rgba(221, 228, 238, 0.26);
  --about-text-soft: rgba(244, 247, 251, 0.76);
  --about-text-dim: rgba(244, 247, 251, 0.6);
  background: var(--midnight);
  color: var(--mist);
  font-family: var(--font-body);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 5vw, 52px) 0 clamp(40px, 7vw, 84px);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(0, 229, 255, 0.16), transparent 58%),
    radial-gradient(90% 80% at 2% 100%, rgba(255, 107, 53, 0.2), transparent 62%),
    linear-gradient(165deg, #061430 0%, #0a1f44 60%, #0a1f44 100%);
}

.page-about .about-hero .annotation {
  display: none;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 44px);
  margin-top: clamp(20px, 4vw, 40px);
}

.page-about .about-hero__lead .eyebrow {
  margin: 0 0 12px;
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 7.4vw, 66px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  max-width: 16em;
}

.page-about .about-hero__intro {
  margin: 20px 0 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--about-text-soft);
  max-width: 40em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__stack {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-stat {
  padding: 16px 16px 18px;
  background: rgba(27, 39, 64, 0.8);
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.page-about .about-stat--wide {
  grid-column: 1 / -1;
  border-left: 3px solid var(--orange);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 6vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__unit {
  margin-left: 4px;
  font-size: 13px;
  color: var(--orange-soft);
  font-family: var(--font-mono);
}

.page-about .about-stat__label {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--about-text-dim);
}

.page-about .about-hero__note {
  margin: clamp(28px, 5vw, 44px) 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--about-line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  line-height: 1.8;
  color: var(--about-text-dim);
}

/* ---------- 提要句 ---------- */
.page-about .about-quote {
  padding: clamp(44px, 9vw, 96px) 0;
  background: var(--ink);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-quote blockquote {
  position: relative;
  margin: 0;
  padding-left: clamp(18px, 3vw, 34px);
  border-left: 4px solid var(--orange);
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(21px, 4.6vw, 40px);
  line-height: 1.42;
  letter-spacing: -0.01em;
  max-width: 22em;
}

/* ---------- 长卷骨架 ---------- */
.page-about .about-flow {
  padding-top: clamp(8px, 3vw, 24px);
}

.page-about .about-flow__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

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

.page-about .about-toc__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--gray);
}

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

.page-about .about-toc__list a {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 9px 0 9px 12px;
  border-left: 2px solid var(--about-line);
  color: var(--about-text-dim);
  font-size: 13px;
  line-height: 1.5;
  text-decoration: none;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), padding-left 0.25s var(--ease);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--mist);
  border-left-color: var(--cyan);
  padding-left: 16px;
}

.page-about .about-toc__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--orange-soft);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: clamp(34px, 6vw, 68px) 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-flow__main > .about-section:first-child {
  border-top: 0;
  padding-top: clamp(18px, 3vw, 32px);
}

.page-about .about-section__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: clamp(16px, 3vw, 26px);
}

.page-about .about-section__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .about-section h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(23px, 4.4vw, 36px);
  line-height: 1.22;
  letter-spacing: -0.015em;
}

.page-about .about-section__lead {
  margin: 0 0 22px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--about-text-soft);
  max-width: 42em;
}

.page-about .about-section p {
  font-size: 15px;
  line-height: 1.88;
  color: var(--about-text-soft);
}

.page-about .about-split {
  display: grid;
  gap: 20px;
}

.page-about .about-split__text p + p {
  margin-top: 16px;
}

/* 起点对照 */
.page-about .about-compare {
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-compare__row {
  background: rgba(27, 39, 64, 0.78);
  padding: 18px 18px 20px;
}

.page-about .about-compare__row--now {
  background: linear-gradient(140deg, rgba(255, 107, 53, 0.16), rgba(27, 39, 64, 0.92) 62%);
  border-left: 3px solid var(--orange);
}

.page-about .about-compare__tag {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-compare__row p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
}

/* ---------- 四步流程 ---------- */
.page-about .flow-steps {
  display: grid;
  gap: 12px;
  margin: 0 0 clamp(24px, 4vw, 36px);
  padding: 0;
  list-style: none;
  counter-reset: flow;
}

.page-about .flow-step {
  padding: 18px 16px 20px;
  background: rgba(27, 39, 64, 0.85);
  border-top: 3px solid var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .flow-step:nth-child(2) {
  border-top-color: var(--teal);
}

.page-about .flow-step:nth-child(3) {
  border-top-color: var(--orange-soft);
}

.page-about .flow-step:nth-child(4) {
  border-top-color: var(--orange);
}

.page-about .flow-step__stage {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gray);
}

.page-about .flow-step h3 {
  margin: 6px 0 2px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.page-about .flow-step__time {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--orange-soft);
}

.page-about .flow-step p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-text-soft);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  position: relative;
  margin: 0 0 clamp(22px, 3vw, 32px);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
  filter: saturate(1.05) contrast(1.04);
}

.page-about .about-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(0, 229, 255, 0.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 255, 0.16) 1px, transparent 1px);
  background-size: 44px 44px;
  opacity: 0.22;
  mix-blend-mode: screen;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .about-figure figcaption {
  margin-top: 12px;
  padding-left: 10px;
  border-left: 2px solid var(--teal);
  font-size: 13px;
  line-height: 1.75;
  color: var(--about-text-dim);
}

/* ---------- 分工矩阵 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 12px;
  margin-top: 4px;
}

.page-about .team-card {
  padding: 20px 18px 22px;
  background: linear-gradient(155deg, rgba(27, 39, 64, 0.94), rgba(6, 20, 48, 0.94));
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  transition: transform 0.32s var(--ease), border-color 0.32s var(--ease), box-shadow 0.32s var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  transform: translateY(-4px);
  border-color: rgba(255, 107, 53, 0.6);
  box-shadow: 0 20px 44px -28px rgba(0, 229, 255, 0.8);
}

.page-about .team-card__top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}

.page-about .team-card h3 {
  margin: 0;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.page-about .team-card__num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .team-card p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--about-text-soft);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 4px 0 0 24px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), rgba(0, 229, 255, 0.06));
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: 6px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 14px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--midnight);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(0, 229, 255, 0.14);
  transition: box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .timeline__item:hover::before,
.page-about .timeline__item:focus-within::before {
  border-color: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.22);
}

.page-about .timeline__item details {
  border-bottom: 1px solid var(--about-line);
}

.page-about .timeline__item summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 12px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .timeline__title {
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .timeline__item details[open] .timeline__title {
  color: var(--cyan);
}

.page-about .timeline__body {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--about-text-soft);
  max-width: 40em;
}

/* ---------- 合作 ---------- */
.page-about .collab-grid {
  display: grid;
  gap: 12px;
}

.page-about .collab-card {
  padding: 18px 18px 20px;
  background: rgba(27, 39, 64, 0.7);
  border-left: 3px solid var(--orange);
}

.page-about .collab-card:nth-child(2) {
  border-left-color: var(--orange-soft);
}

.page-about .collab-card:nth-child(3) {
  border-left-color: var(--cyan);
}

.page-about .collab-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.page-about .collab-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--about-text-soft);
}

.page-about .about-inline-link {
  margin: 20px 0 0;
  font-size: 14px;
  color: var(--about-text-dim);
}

.page-about .about-inline-link a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.45);
  padding-bottom: 1px;
}

.page-about .about-inline-link a:hover {
  color: var(--orange-soft);
  border-bottom-color: var(--orange-soft);
}

/* ---------- 规矩列表 ---------- */
.page-about .rules {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .rules li {
  display: grid;
  gap: 6px;
  padding: 16px 18px 18px;
  background: var(--midnight);
}

.page-about .rules__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .rules p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--about-text-soft);
}

/* ---------- 接下来 ---------- */
.page-about .next-grid {
  display: grid;
  gap: 12px;
}

.page-about .next-card {
  padding: 20px 18px 22px;
  background: linear-gradient(160deg, rgba(0, 229, 255, 0.12), rgba(27, 39, 64, 0.88) 58%);
  border: 1px solid var(--about-line);
}

.page-about .next-card__idx {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  color: rgba(0, 229, 255, 0.5);
  font-variant-numeric: tabular-nums;
}

.page-about .next-card h3 {
  margin: 8px 0 10px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.page-about .next-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--about-text-soft);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  padding: clamp(40px, 7vw, 84px) 0 clamp(48px, 8vw, 96px);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(255, 107, 53, 0.26), transparent 56%),
    linear-gradient(140deg, #0a1f44, #061430);
}

.page-about .about-cta__box {
  padding-top: clamp(22px, 4vw, 32px);
  border-top: 3px solid var(--orange);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(26px, 5.2vw, 44px);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.page-about .about-cta__text {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.88;
  color: var(--about-text-soft);
  max-width: 40em;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-cta__links {
  margin: 20px 0 0;
  font-size: 13px;
  color: var(--about-text-dim);
}

.page-about .about-cta__links a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.45);
}

.page-about .about-cta__links a:hover {
  color: var(--orange-soft);
  border-bottom-color: var(--orange-soft);
}

.page-about .about-cta__links span {
  margin: 0 8px;
  color: var(--gray);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .flow-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .rules li {
    grid-template-columns: 96px minmax(0, 1fr);
    align-items: baseline;
    gap: 14px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.85fr);
    align-items: end;
  }

  .page-about .about-hero__stack {
    padding-bottom: 6px;
  }

  .page-about .about-hero .annotation {
    display: block;
    position: absolute;
    top: 42%;
    right: clamp(10px, 2vw, 26px);
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.3em;
    color: rgba(0, 229, 255, 0.5);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: center;
    gap: clamp(24px, 3vw, 40px);
  }

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

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

@media (min-width: 1100px) {
  .page-about .about-flow__grid {
    grid-template-columns: 200px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-toc {
    display: block;
    position: sticky;
    top: 104px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .timeline__item::before,
  .page-about .about-toc__list a {
    transition: none;
  }

  .page-about .team-card:hover,
  .page-about .team-card:focus-within {
    transform: none;
  }

  .page-about .about-toc__list a:hover,
  .page-about .about-toc__list a:focus-visible {
    padding-left: 12px;
  }
}
<<<END>>>