.page-about {
  --about-gap: clamp(20px, 4vw, 40px);
  --about-chapter-pad: clamp(44px, 7.5vw, 92px);
  --about-card: rgba(20, 49, 75, .55);
  --about-card-deep: rgba(5, 13, 22, .55);
  background: var(--ink);
  color: var(--bone);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb-wrap {
  padding-top: clamp(16px, 3vw, 26px);
  padding-bottom: clamp(12px, 2vw, 20px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4.5vw, 48px) 0 clamp(38px, 6vw, 76px);
  background:
    radial-gradient(900px 420px at 88% -12%, rgba(53, 224, 208, .16), transparent 68%),
    radial-gradient(620px 340px at 8% 108%, rgba(255, 122, 47, .12), transparent 70%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 100%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 6px;
  background-image: repeating-linear-gradient(90deg, var(--line-strong) 0 1px, transparent 1px 28px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), rgba(53, 224, 208, .08) 58%, var(--orange));
  opacity: .6;
}

.page-about .about-hero-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4.5vw, 48px);
  align-items: start;
}

.page-about .about-kicker {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-kicker .num {
  color: var(--orange);
  font-size: 13px;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-cond);
  font-size: clamp(30px, 6.4vw, 54px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.012em;
  color: var(--bone);
}

.page-about .about-lede {
  margin: clamp(14px, 2.4vw, 20px) 0 0;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--stone);
}

.page-about .about-hero-actions {
  margin-top: clamp(20px, 3vw, 30px);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* 首屏档案面板 */
.page-about .about-hero-facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  align-self: start;
}

.page-about .about-facts-title {
  margin: 0;
  padding: 12px 16px;
  background: var(--about-card-deep);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--stone);
}

.page-about .about-fact {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 14px;
  padding: 14px 16px;
  background: var(--about-card);
  transition: background var(--dur) var(--ease);
}

.page-about .about-fact:hover {
  background: rgba(20, 49, 75, .82);
}

.page-about .about-fact-num {
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--orange);
}

.page-about .about-fact-label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--stone);
}

/* ---------- 章节外壳 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: var(--about-chapter-pad) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-chapter--band {
  background: linear-gradient(180deg, rgba(20, 49, 75, .5) 0%, rgba(11, 27, 43, .06) 100%);
}

.page-about .about-chapter-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
}

.page-about .about-chapter-header {
  display: grid;
  gap: 8px;
}

.page-about .about-chapter-index {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(34px, 6vw, 56px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .04em;
  color: var(--orange);
}

.page-about .about-chapter-summary {
  margin: 12px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--line-strong);
  font-size: 13px;
  line-height: 1.75;
  color: var(--stone);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-chapter:hover .about-chapter-summary,
.page-about .about-chapter:focus-within .about-chapter-summary {
  color: var(--cyan);
  border-left-color: var(--cyan);
}

.page-about .about-chapter-body h2 {
  margin: 0;
  font-family: var(--font-cond);
  font-size: clamp(24px, 3.8vw, 38px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -.008em;
  color: var(--bone);
}

.page-about .about-chapter-lede {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 日常四件事 ---------- */
.page-about .about-duties {
  list-style: none;
  margin: clamp(24px, 3.6vw, 36px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
}

.page-about .about-duty {
  position: relative;
  padding: 20px 18px 20px 20px;
  background: var(--about-card);
  border-left: 3px solid var(--line-strong);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-duty:hover,
.page-about .about-duty:focus-within {
  border-left-color: var(--cyan);
  background: rgba(20, 49, 75, .82);
  transform: translateY(-2px);
}

.page-about .about-duty-index {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .about-duty-name {
  margin: 8px 0 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--bone);
}

.page-about .about-duty-text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 图形 ---------- */
.page-about .about-figure {
  margin: clamp(22px, 3.4vw, 34px) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  background: linear-gradient(135deg, var(--ink-2), var(--arch));
}

.page-about .about-figure--wide img {
  aspect-ratio: 16 / 6;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
  border-bottom: 1px dashed var(--line-strong);
  padding-bottom: 8px;
}

/* ---------- 阶段轨道 ---------- */
.page-about .about-stages {
  list-style: none;
  margin: clamp(22px, 3.4vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stage {
  padding: 16px 14px 20px;
  background: var(--ink);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-stage:hover,
.page-about .about-stage:focus-within {
  background: var(--ink-2);
  box-shadow: inset 0 0 0 1px var(--cyan);
}

.page-about .about-stage-node {
  display: block;
  width: 100%;
  height: 4px;
  margin-bottom: 14px;
  background: var(--clay);
}

.page-about .about-stage--done .about-stage-node {
  background: var(--moss);
}

.page-about .about-stage--live .about-stage-node {
  background: linear-gradient(90deg, var(--cyan), var(--orange));
}

.page-about .about-stage-name {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--bone);
}

.page-about .about-stage--live .about-stage-name {
  color: var(--cyan);
}

.page-about .about-stage-text {
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--stone);
}

/* ---------- 团队分工 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: clamp(22px, 3.4vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
}

.page-about .about-role {
  padding: 18px 16px;
  background: var(--about-card);
  border-left: 3px solid var(--line-strong);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  border-left-color: var(--cyan);
  background: rgba(20, 49, 75, .84);
  transform: translateY(-2px);
}

.page-about .about-role-head {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 14px;
}

.page-about .about-role-name {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--bone);
  text-decoration: underline;
  text-decoration-color: var(--line-strong);
  text-decoration-thickness: 1px;
  text-underline-offset: 5px;
  transition: text-decoration-color var(--dur) var(--ease);
}

.page-about .about-role:hover .about-role-name {
  text-decoration-color: var(--cyan);
}

.page-about .about-role-count {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--orange);
}

.page-about .about-role-text {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 表格 ---------- */
.page-about .about-table-wrap {
  margin: clamp(22px, 3.4vw, 32px) 0 0;
  overflow-x: auto;
  border: 1px solid var(--line);
  background: rgba(20, 49, 75, .34);
}

.page-about .about-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
}

.page-about .about-table caption {
  padding: 14px 16px;
  text-align: left;
  font-size: 12.5px;
  letter-spacing: .14em;
  color: var(--stone);
  background: var(--about-card-deep);
  border-bottom: 1px solid var(--line);
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 14px 16px;
  text-align: left;
  font-size: 14.5px;
  line-height: 1.75;
  border-bottom: 1px solid var(--line);
  color: var(--bone);
}

.page-about .about-table thead th {
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--cyan);
  background: rgba(5, 13, 22, .5);
  white-space: nowrap;
}

.page-about .about-table tbody th {
  font-weight: 700;
  color: var(--bone);
  white-space: nowrap;
}

.page-about .about-table tbody td {
  color: var(--stone);
}

.page-about .about-table tbody tr:last-child th,
.page-about .about-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .about-table tbody tr:hover th,
.page-about .about-table tbody tr:hover td {
  background: rgba(20, 49, 75, .6);
}

.page-about .about-table .num {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--orange);
}

/* ---------- 伙伴协作 ---------- */
.page-about .about-collab {
  margin-top: clamp(22px, 3.4vw, 32px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-collab-item {
  padding: 20px 18px;
  background: var(--ink);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-collab-item:hover,
.page-about .about-collab-item:focus-within {
  background: var(--ink-2);
  box-shadow: inset 3px 0 0 var(--cyan);
}

.page-about .about-collab-name {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--bone);
}

.page-about .about-collab-text {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 三点收束 ---------- */
.page-about .about-commitments {
  list-style: none;
  margin: clamp(22px, 3.4vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
}

.page-about .about-commitment {
  padding: 20px 18px;
  background: var(--about-card);
  border-top: 2px solid var(--moss);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-commitment:hover,
.page-about .about-commitment:focus-within {
  transform: translateY(-2px);
  background: rgba(20, 49, 75, .84);
}

.page-about .about-commitment:nth-child(2) {
  border-top-color: var(--cyan);
}

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

.page-about .about-commit-index {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .2em;
  color: var(--stone);
}

.page-about .about-commit-name {
  margin: 10px 0 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--bone);
}

.page-about .about-commit-text {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 下一步入口条 ---------- */
.page-about .about-next {
  margin-top: clamp(26px, 4vw, 40px);
  padding: clamp(20px, 3vw, 30px) clamp(18px, 3vw, 28px);
  background: linear-gradient(120deg, rgba(53, 224, 208, .12), rgba(255, 122, 47, .1));
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--cyan);
}

.page-about .about-next-text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--bone);
}

.page-about .about-next-actions {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-duties {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-chapter-inner {
    grid-template-columns: minmax(190px, 240px) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 68px);
  }

  .page-about .about-chapter-inner--flip {
    grid-template-columns: minmax(0, 1fr) minmax(190px, 240px);
  }

  .page-about .about-chapter-inner--flip .about-chapter-rail {
    order: 2;
  }

  .page-about .about-chapter-inner--flip .about-chapter-body {
    order: 1;
  }

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

@media (min-width: 1024px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 64px);
    align-items: end;
  }
}

@media (min-width: 1120px) {
  .page-about .about-stages {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-duty,
  .page-about .about-role,
  .page-about .about-commitment {
    transition: none;
  }
}
<<<END>>>

第 12 版的记录已经保存好了，随时可以继续下一步。