.page-about {
  --ab-pad: 20px;
  --ab-card: var(--field);
  --ab-radius: 16px;
  position: relative;
  overflow-x: clip;
  background:
    radial-gradient(120% 80% at 80% -10%, rgba(122, 92, 255, 0.16), transparent 60%),
    radial-gradient(90% 70% at 0% 10%, rgba(53, 242, 208, 0.08), transparent 62%),
    var(--ink);
  color: var(--ivory);
  font-family: var(--font-body);
  padding: 0 var(--ab-pad) 72px;
  line-height: 1.75;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  overflow-wrap: break-word;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 18px 0 4px;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-numeric);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--moss);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-strong);
}

.page-about .breadcrumb-link {
  color: var(--moss);
  text-decoration: none;
  transition: color 160ms ease;
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--neon);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 20px 0 44px;
  display: grid;
  gap: 28px;
}

.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-numeric);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--neon);
}

.page-about h1 {
  margin: 12px 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 8.2vw, 62px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--ivory);
}

.page-about .ab-lead {
  margin: 0 0 16px;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--ivory);
}

.page-about .body-copy {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.8;
  letter-spacing: 0.01em;
  color: var(--moss);
}

.page-about .ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 160ms ease, background-color 160ms ease, color 160ms ease;
}

.page-about .btn--primary {
  background: var(--neon);
  color: var(--ink);
}

.page-about .btn--ghost {
  border-color: var(--line-strong);
  color: var(--ivory);
  background: rgba(12, 43, 35, 0.7);
}

.page-about .btn:hover,
.page-about .btn:focus-visible {
  transform: translateY(-2px);
}

.page-about .btn--ghost:hover,
.page-about .btn--ghost:focus-visible {
  color: var(--neon);
  border-color: var(--neon);
}

.page-about .ab-hero-figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line-strong);
  background: var(--pine);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
}

.page-about .ab-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .ab-hero-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 45%, rgba(7, 26, 22, 0.82));
  pointer-events: none;
}

.page-about .ab-hero-figure figcaption {
  position: relative;
  z-index: 1;
  margin: -46px 16px 16px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--moss);
}

/* ---------- 章节通用 ---------- */
.page-about .ab-section {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 42px 0 8px;
  border-top: 1px solid var(--line);
}

.page-about .ab-sec-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 16px;
  margin-bottom: 18px;
}

.page-about .section-number {
  font-family: var(--font-numeric);
  font-weight: 700;
  font-size: clamp(26px, 5vw, 42px);
  line-height: 1;
  color: var(--moss);
  letter-spacing: -0.01em;
  transition: color 260ms ease;
}

.page-about .ab-section[data-active] .section-number,
.page-about .ab-cta[data-active] .section-number {
  color: var(--neon);
}

.page-about .section-heading {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 3.6vw, 32px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--ivory);
}

.page-about .ab-intro {
  max-width: 68ch;
}

/* ---------- 人数比例条 ---------- */
.page-about .ab-share {
  margin: 24px 0 22px;
}

.page-about .ab-stackbar {
  display: flex;
  gap: 3px;
  height: 54px;
  padding: 3px;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  background: var(--ink);
}

.page-about .ab-seg {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  border-radius: 8px;
}

.page-about .ab-seg--content {
  flex: 18 1 0;
  background: linear-gradient(120deg, var(--neon), #1fc4a9);
}

.page-about .ab-seg--data {
  flex: 9 1 0;
  background: linear-gradient(120deg, var(--amber), #d98d0a);
}

.page-about .ab-seg--tech {
  flex: 14 1 0;
  background: linear-gradient(120deg, var(--violet), #5a3fe0);
}

.page-about .ab-seg-num {
  font-family: var(--font-numeric);
  font-weight: 700;
  font-size: clamp(16px, 4vw, 21px);
  color: var(--ink);
  letter-spacing: -0.01em;
}

.page-about .ab-share-caption {
  margin-top: 10px;
  font-family: var(--font-numeric);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--moss);
}

/* ---------- 可展开面板 ---------- */
.page-about .ab-panels {
  display: grid;
  gap: 12px;
}

.page-about .panel {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(12, 43, 35, 0.78);
  overflow: hidden;
}

.page-about .panel-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  background: none;
  border: 0;
  color: var(--ivory);
  font-family: inherit;
  font-size: 16px;
  text-align: left;
  cursor: pointer;
  transition: background-color 160ms ease;
}

.page-about .panel-toggle:hover,
.page-about .panel-toggle:focus-visible {
  background: rgba(53, 242, 208, 0.08);
}

.page-about .panel-toggle[aria-expanded="true"] {
  border-bottom: 1px solid var(--line);
}

.page-about .ab-panel-name {
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .ab-panel-count {
  margin-left: auto;
  font-family: var(--font-numeric);
  font-weight: 700;
  font-size: 21px;
  color: var(--amber);
  letter-spacing: -0.01em;
}

.page-about .ab-panel-count small {
  font-size: 11px;
  font-weight: 500;
  margin-left: 3px;
  color: var(--moss);
  letter-spacing: 0;
}

.page-about .panel-body {
  padding: 14px 18px 18px;
}

.page-about .ab-panel-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .ab-panel-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ivory);
}

.page-about .ab-panel-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 8px;
  height: 1px;
  background: var(--neon);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  position: relative;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--line-strong), var(--line));
}

.page-about .ab-tl-item {
  position: relative;
  padding-left: 42px;
  margin-bottom: 16px;
}

.page-about .ab-tl-item::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 18px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--neon);
  box-shadow: 0 0 12px rgba(53, 242, 208, 0.45);
}

.page-about .ab-tl-card {
  padding: 15px 17px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(155deg, rgba(18, 58, 47, 0.92), rgba(12, 43, 35, 0.6));
}

.page-about .ab-tl-year {
  margin: 0 0 4px;
  font-family: var(--font-numeric);
  font-weight: 700;
  font-size: 25px;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--amber);
}

.page-about .ab-tl-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: 0.01em;
  color: var(--ivory);
}

.page-about .ab-tl-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--moss);
}

.page-about .ab-tl-note {
  margin: 10px 0 0;
  font-family: var(--font-numeric);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--neon);
  opacity: 0.75;
}

/* ---------- 图片块 ---------- */
.page-about .ab-figure {
  margin: 22px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--ab-radius);
  background: var(--pine);
  overflow: hidden;
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .ab-tl-figure img {
  aspect-ratio: 2 / 1;
}

.page-about .ab-figure figcaption {
  padding: 12px 16px 14px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--moss);
}

/* ---------- 流程步骤 ---------- */
.page-about .ab-steps {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-step {
  padding: 16px 16px 14px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--neon);
  border-radius: 0 14px 14px 0;
  background: linear-gradient(160deg, rgba(18, 58, 47, 0.92), rgba(12, 43, 35, 0.55));
}

.page-about .ab-step:nth-child(3) {
  border-left-color: var(--amber);
}

.page-about .ab-step:nth-child(4) {
  border-left-color: var(--violet);
}

.page-about .ab-step-num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-numeric);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .ab-step h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16.5px;
  color: var(--ivory);
}

.page-about .ab-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--moss);
}

/* ---------- 节奏分栏 ---------- */
.page-about .ab-split {
  display: grid;
  gap: 24px;
  align-items: start;
}

.page-about .ab-rhythm-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  border-top: 1px solid var(--line);
}

.page-about .ab-rhythm-list li {
  display: grid;
  gap: 5px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-rhythm-key {
  font-family: var(--font-numeric);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--neon);
}

.page-about .ab-rhythm-val {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--ivory);
}

.page-about .ab-rhythm-aside {
  padding: 20px 18px;
  border: 1px solid var(--line-strong);
  border-radius: var(--ab-radius);
  background: linear-gradient(150deg, rgba(90, 18, 48, 0.55), rgba(12, 43, 35, 0.72));
  text-align: center;
}

.page-about .ab-big-num {
  margin: 0;
  font-family: var(--font-numeric);
  font-weight: 700;
  font-size: clamp(54px, 15vw, 84px);
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: var(--amber);
}

.page-about .ab-big-num span {
  font-size: 0.48em;
  color: var(--neon);
}

.page-about .ab-big-label {
  margin: 12px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: var(--moss);
}

/* ---------- 编号协作 ---------- */
.page-about .ab-linkage {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-linkage li {
  padding: 15px 17px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--violet);
  border-radius: 0 12px 12px 0;
  background: rgba(12, 43, 35, 0.72);
}

.page-about .ab-linkage-id {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-numeric);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--neon);
}

.page-about .ab-linkage p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--ivory);
}

/* ---------- 覆盖范围 ---------- */
.page-about .ab-facts {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-facts li {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--pine);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ivory);
}

.page-about .ab-facts strong {
  margin-right: 6px;
  font-family: var(--font-numeric);
  font-weight: 700;
  font-size: 19px;
  color: var(--amber);
  letter-spacing: -0.01em;
}

.page-about .ab-scale {
  margin: 24px 0 0;
}

.page-about .ab-scale-track {
  position: relative;
  height: 10px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--ink);
  overflow: hidden;
}

.page-about .ab-scale-fill {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--neon), var(--violet) 58%, var(--amber));
  opacity: 0.9;
}

.page-about .ab-scale-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 9px;
  font-family: var(--font-numeric);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--moss);
}

.page-about .ab-scale-caption {
  margin-top: 12px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--moss);
}

/* ---------- 收束 ---------- */
.page-about .ab-cta {
  max-width: var(--content-max);
  margin: 48px auto 0;
  padding: 28px 22px;
  border: 1px solid var(--line-strong);
  border-radius: var(--ab-radius);
  background:
    linear-gradient(140deg, rgba(122, 92, 255, 0.22), rgba(18, 58, 47, 0.9) 55%, rgba(7, 26, 22, 0.95));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .ab-cta-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 3.4vw, 27px);
  line-height: 1.24;
  color: var(--ivory);
}

.page-about .ab-cta-text {
  margin: 0 0 20px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--moss);
}

.page-about .ab-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 右缘竖排注记 ---------- */
.page-about .ab-side-note {
  display: none;
}

/* ---------- 动画 ---------- */
@keyframes ab-node-in {
  from {
    opacity: 0.3;
  }
  to {
    opacity: 1;
  }
}

@supports (animation-timeline: view()) {
  .page-about .ab-tl-item {
    animation: ab-node-in linear both;
    animation-timeline: view();
    animation-range: entry 8% cover 34%;
  }
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about {
    --ab-pad: 28px;
  }

  .page-about .ab-rhythm-list li {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }

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

  .page-about .ab-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about {
    --ab-pad: 40px;
    padding-bottom: 96px;
  }

  .page-about .ab-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 44px;
    align-items: end;
    padding: 34px 0 60px;
  }

  .page-about .ab-hero-figure {
    margin-bottom: 6px;
  }

  .page-about .ab-section {
    padding: 56px 0 12px;
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: 40px;
  }

  .page-about .ab-rhythm-aside {
    padding: 28px 20px;
    position: sticky;
    top: 84px;
  }

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

  .page-about .ab-cta {
    padding: 36px 34px;
  }

  /* 时间轴左右交替 */
  .page-about .ab-timeline::before {
    left: 50%;
  }

  .page-about .ab-tl-item {
    width: 50%;
    padding-left: 0;
    padding-right: 46px;
    margin-bottom: 10px;
  }

  .page-about .ab-tl-item::before {
    left: auto;
    right: -7px;
    top: 24px;
  }

  .page-about .ab-tl-item:nth-child(even) {
    margin-left: 50%;
    padding-right: 0;
    padding-left: 46px;
  }

  .page-about .ab-tl-item:nth-child(even)::before {
    left: -7px;
    right: auto;
  }
}

/* ---------- 宽屏竖排注记 ---------- */
@media (min-width: 1340px) {
  .page-about .ab-side-note {
    display: block;
    position: fixed;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    writing-mode: vertical-rl;
    font-family: var(--font-numeric);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.2em;
    color: var(--moss);
    opacity: 0.72;
    pointer-events: none;
    z-index: 2;
  }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .btn,
  .page-about .section-number,
  .page-about .panel-toggle {
    transition: none;
  }

  .page-about .btn:hover {
    transform: none;
  }

  .page-about .ab-tl-item {
    animation: none;
  }
}
<<<END>>>