.page-about {
  background: var(--deep);
  color: var(--ink);
  font-family: var(--body);
  overflow-x: hidden;
  --about-sheet: repeating-linear-gradient(
    to bottom,
    rgba(244, 241, 234, 0.032) 0px,
    rgba(244, 241, 234, 0.032) 1px,
    transparent 1px,
    transparent 26px
  );
}

.page-about .breadcrumbs {
  padding-top: 22px;
  padding-bottom: 4px;
}

/* ---------- 档案封面首屏 ---------- */

.page-about .archive-cover {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(34px, 7vw, 92px) 0 clamp(42px, 7vw, 86px);
  border-bottom: 1px solid var(--line);
}

.page-about .cover-visual {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.page-about .cover-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(104deg, rgba(11, 30, 45, 0.97) 0%, rgba(11, 30, 45, 0.8) 44%, rgba(11, 30, 45, 0.4) 100%),
    radial-gradient(120% 92% at 86% 16%, rgba(255, 122, 26, 0.3), transparent 62%);
}

.page-about .cover-visual img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.72;
}

.page-about .cover-inner {
  display: grid;
  gap: 16px;
}

.page-about .archive-cover h1 {
  margin: 0;
  max-width: 17em;
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(34px, 6.6vw, 76px);
  line-height: 1.04;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

.page-about .archive-cover .lede {
  margin: 0;
  max-width: 60ch;
  padding-left: 16px;
  border-left: 3px solid var(--orange);
  color: var(--ink-dim);
  font-size: clamp(15px, 1.55vw, 18px);
  line-height: 1.74;
}

.page-about .cover-stats {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .cover-stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px 16px;
  border: 1px solid var(--line);
  background: var(--glass);
  backdrop-filter: blur(12px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

.page-about .cover-stats .stat-value {
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1;
}

.page-about .cover-stats .stat-label {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

/* ---------- 通用章节 ---------- */

.page-about .section {
  padding-block: clamp(44px, 8vw, 96px);
}

.page-about .section-head {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(22px, 4vw, 40px);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-about .section-num {
  margin: 0;
  color: var(--clay);
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.24em;
}

.page-about .section-head h2 {
  margin: 0;
  max-width: 24em;
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(24px, 3.7vw, 42px);
  line-height: 1.12;
}

.page-about .lede--tight {
  max-width: 68ch;
  margin: 0 0 clamp(20px, 3vw, 32px);
  color: var(--ink-dim);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.76;
}

/* ---------- 左右交错档案排布 ---------- */

.page-about .ledger {
  display: grid;
  gap: clamp(26px, 5vw, 56px);
}

.page-about .ledger-row {
  display: grid;
  gap: clamp(18px, 3vw, 34px);
  align-items: start;
}

.page-about .ledger-text p {
  margin: 0 0 1.05em;
  color: var(--ink-dim);
  font-size: 16px;
  line-height: 1.72;
}

.page-about .ledger-text p:last-of-type {
  margin-bottom: 1.2em;
}

.page-about .ledger-text strong {
  color: var(--ink);
  font-weight: 600;
}

.page-about .text-link {
  display: inline-block;
  color: var(--orange-soft);
  font-size: 14.5px;
  letter-spacing: 0.02em;
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 167, 101, 0.42);
  padding-bottom: 2px;
  transition: color var(--t-fast), border-color var(--t-fast);
}

.page-about .text-link:hover,
.page-about .text-link:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

/* ---------- 步骤列 ---------- */

.page-about .sheet-panel {
  padding: clamp(20px, 3.4vw, 30px);
  background-color: rgba(22, 41, 58, 0.94);
  background-image: var(--about-sheet);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .step-list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 20px;
  border-left: 1px solid var(--line-strong);
}

.page-about .step-list li {
  position: relative;
  padding-bottom: 22px;
}

.page-about .step-list li:last-child {
  padding-bottom: 0;
}

.page-about .step-list li::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--clay);
  box-shadow: 0 0 0 4px rgba(194, 104, 63, 0.18);
}

.page-about .step-list li.is-current::before {
  background: var(--orange);
  box-shadow: 0 0 0 5px rgba(255, 122, 26, 0.22);
}

.page-about .step-k {
  display: block;
  margin-bottom: 5px;
  color: var(--clay);
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.12em;
}

.page-about .step-list strong {
  display: block;
  color: var(--ink);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.45;
}

.page-about .step-d {
  display: block;
  margin-top: 5px;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.65;
}

/* ---------- 档案卡片 ---------- */

.page-about .cut-card {
  padding: clamp(20px, 3.4vw, 30px);
  background: var(--console);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .cut-card__k {
  margin: 0 0 8px;
  color: var(--orange-soft);
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.16em;
}

.page-about .cut-card__v {
  margin: 0;
  color: var(--ink);
  font-size: 16px;
}

.page-about .cut-card__v .stat-value {
  font-size: clamp(30px, 4.4vw, 46px);
  line-height: 1;
  margin-right: 6px;
}

.page-about .cut-card__d {
  margin: 12px 0 20px;
  color: var(--ink-soft);
  font-size: 14.5px;
  line-height: 1.7;
}

.page-about .tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

/* ---------- 横向年表 ---------- */

.page-about .section--rail {
  position: relative;
}

.page-about .era-wrap {
  position: relative;
  padding: clamp(18px, 3vw, 28px) 0 clamp(14px, 2vw, 20px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background-image: var(--about-sheet);
}

.page-about .era-track {
  list-style: none;
  margin: 0;
  padding: 6px 4px 16px;
  display: flex;
  gap: clamp(12px, 2.6vw, 30px);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--rock) transparent;
}

.page-about .era-track::-webkit-scrollbar {
  height: 6px;
}

.page-about .era-track::-webkit-scrollbar-thumb {
  background: var(--rock);
  border-radius: 3px;
}

.page-about .era-node {
  flex: 0 0 auto;
  min-width: 66px;
  scroll-snap-align: center;
  display: grid;
  justify-items: center;
  gap: 9px;
  padding: 8px 4px 4px;
}

.page-about .era-year {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: clamp(19px, 2.4vw, 28px);
  font-weight: 600;
  line-height: 1;
  transition: color var(--t-fast), transform var(--t-fast);
}

.page-about .era-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--clay);
  transition: transform var(--t-fast), box-shadow var(--t-fast);
}

.page-about .era-dot--moss {
  background: var(--moss);
}

.page-about .era-node:hover .era-year,
.page-about .era-node:focus-within .era-year {
  color: var(--orange);
  transform: translateY(-2px);
}

.page-about .era-node:hover .era-dot,
.page-about .era-node:focus-within .era-dot {
  transform: scale(1.55);
  box-shadow: 0 0 0 5px rgba(255, 122, 26, 0.16);
}

.page-about .era-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 0;
  padding: 0 4px;
  color: var(--ink-soft);
  font-size: 13px;
  letter-spacing: 0.03em;
}

.page-about .era-legend span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .era-key {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  display: inline-block;
}

.page-about .era-key--moss {
  background: var(--moss);
}

.page-about .era-key--clay {
  background: var(--clay);
}

.page-about .era-detail {
  margin-top: clamp(30px, 5vw, 56px);
}

/* ---------- 图片 ---------- */

.page-about .ledger-media {
  margin: 0;
}

.page-about .media-frame {
  background: linear-gradient(150deg, var(--console), var(--deep));
}

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

.page-about .media-frame--wide {
  aspect-ratio: 3 / 2;
}

.page-about .media-frame--tall {
  aspect-ratio: 3 / 4;
}

.page-about .ledger-media figcaption {
  margin-top: 10px;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: 0.03em;
}

/* ---------- 四代面板 ---------- */

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

.page-about .gen-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 18px 20px;
  background: var(--console);
  border: 1px solid var(--line);
  border-left: 3px solid var(--rock);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  transition: border-color var(--t-fast), transform var(--t-fast);
}

.page-about .gen-item:hover {
  border-left-color: var(--orange);
  transform: translateX(3px);
}

.page-about .gen-item--now {
  border-left-color: var(--cyan);
  background: linear-gradient(120deg, rgba(59, 224, 192, 0.08), rgba(22, 41, 58, 0.98) 46%);
}

.page-about .gen-num {
  color: var(--clay);
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.2;
}

.page-about .gen-body strong {
  display: block;
  color: var(--ink);
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.45;
  margin-bottom: 6px;
}

.page-about .gen-body p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 14.5px;
  line-height: 1.7;
}

/* ---------- 合作 ---------- */

.page-about .partner-grid {
  display: grid;
  gap: 14px;
}

.page-about .partner-card {
  padding: 20px 22px 22px;
  background: var(--console);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .partner-num {
  margin: 0 0 6px;
  color: var(--orange);
  font-family: var(--mono);
  font-size: clamp(30px, 4.6vw, 46px);
  font-weight: 600;
  line-height: 1;
}

.page-about .partner-card h3 {
  margin: 0 0 8px;
  font-family: var(--display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-about .partner-card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 14.5px;
  line-height: 1.7;
}

.page-about .partner-card--wide {
  background: linear-gradient(130deg, rgba(194, 104, 63, 0.16), rgba(22, 41, 58, 0.98) 58%);
}

/* ---------- 下一步链接 ---------- */

.page-about .section--next .next-links {
  display: grid;
  gap: 12px;
}

.page-about .link-card {
  display: grid;
  gap: 6px;
  padding: 18px 20px 20px;
  background: var(--console);
  border: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  transition: border-color var(--t-fast), background var(--t-fast), transform var(--t-fast);
}

.page-about .link-card:hover,
.page-about .link-card:focus-visible {
  border-color: var(--orange);
  background: rgba(255, 122, 26, 0.08);
  transform: translateY(-3px);
}

.page-about .link-card__k {
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
}

.page-about .link-card__t {
  font-family: var(--display);
  font-size: 19px;
  font-weight: 700;
}

.page-about .link-card__d {
  color: var(--ink-soft);
  font-size: 13.5px;
  line-height: 1.62;
}

/* ---------- 焦点态 ---------- */

.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 平板 ---------- */

@media (min-width: 720px) {
  .page-about .cover-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .partner-card--wide {
    grid-column: span 2;
  }

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

/* ---------- 桌面 ---------- */

@media (min-width: 900px) {
  .page-about .ledger-row {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(30px, 5vw, 72px);
  }

  .page-about .ledger-row--flip .ledger-text {
    order: 2;
  }

  .page-about .ledger-row--flip .ledger-side,
  .page-about .ledger-row--flip .ledger-media {
    order: 1;
  }

  .page-about .archive-cover {
    padding-bottom: clamp(60px, 8vw, 104px);
  }
}

@media (min-width: 1080px) {
  .page-about .next-links {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .partner-card--wide {
    grid-column: span 1;
  }
}

/* ---------- 减少动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .era-year,
  .page-about .era-dot,
  .page-about .gen-item,
  .page-about .link-card {
    transition: none;
  }

  .page-about .gen-item:hover,
  .page-about .link-card:hover,
  .page-about .era-node:hover .era-year {
    transform: none;
  }
}
<<<END>>>