.page-about {
  --about-rail: 44px;
  --about-gap: clamp(16px, 3vw, 34px);
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: clamp(24px, 5vw, 52px) var(--gutter) clamp(72px, 10vw, 128px);
}

.page-about .about-chapter-main,
.page-about .about-p,
.page-about .about-h2,
.page-about .flow-text,
.page-about .line-text,
.page-about .ver-text {
  min-width: 0;
  overflow-wrap: break-word;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding-bottom: clamp(32px, 5vw, 58px);
  border-bottom: 1px solid var(--ink-line);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(22px, 4vw, 40px);
}

.page-about .about-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.05rem, 6.2vw, 3.9rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin: 14px 0 0;
  max-width: 20ch;
}

.page-about .about-lead {
  margin-top: clamp(20px, 3vw, 28px);
  max-width: 60ch;
  font-size: clamp(15px, 1.9vw, 17px);
  line-height: 1.9;
  color: var(--text-soft);
}

.page-about .about-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 26px;
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--ink-line);
}

.page-about .about-hero-meta li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.page-about .about-hero-meta strong {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 600;
  color: var(--cyan);
  letter-spacing: 0;
  text-shadow: 0 0 12px rgba(52, 229, 212, 0.3);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-chapter {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  gap: var(--about-gap);
  padding: clamp(44px, 7vw, 86px) 0;
  border-top: 1px solid var(--ink-line);
}

.page-about .about-chapter:first-of-type {
  border-top: 0;
}

.page-about .about-chapter > .section-mark {
  display: block;
  text-align: center;
  padding-top: 6px;
  font-family: var(--font-mono);
  font-size: clamp(14px, 1.5vw, 18px);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--dim);
  transition: color var(--t-mid) ease, text-shadow var(--t-mid) ease;
}

.page-about .about-chapter > .section-mark::after {
  content: "";
  display: block;
  width: 1px;
  height: 44px;
  margin: 12px auto 0;
  background: linear-gradient(180deg, var(--ink-line), transparent);
}

.page-about .about-chapter.is-current > .section-mark {
  color: var(--cyan);
  text-shadow: 0 0 12px rgba(52, 229, 212, 0.5);
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.45rem, 3.4vw, 2.2rem);
  line-height: 1.34;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 8px 0 0;
  max-width: 26ch;
}

.page-about .about-rule {
  display: block;
  width: 52px;
  height: 2px;
  margin: 18px 0 clamp(20px, 3vw, 30px);
  background: linear-gradient(90deg, var(--cyan), rgba(52, 229, 212, 0));
}

.page-about .about-subhead {
  margin: clamp(34px, 5vw, 52px) 0 0;
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .about-p {
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-soft);
  max-width: 66ch;
}

.page-about .about-p + .about-p {
  margin-top: 1.1em;
}

.page-about .about-p a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(52, 229, 212, 0.35);
  transition: border-color var(--t-fast) ease;
}

.page-about .about-p a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .about-closing {
  margin-top: clamp(28px, 4vw, 42px);
  padding-top: 22px;
  border-top: 1px solid var(--ink-line);
  font-size: 15px;
  line-height: 1.9;
  color: var(--muted);
  max-width: 62ch;
}

.page-about .about-closing a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(52, 229, 212, 0.35);
}

/* ---------- 交错两栏 ---------- */

.page-about .about-cols {
  display: grid;
  gap: 18px;
}

/* ---------- 图片框 ---------- */

.page-about .about-figure {
  margin: 0 0 clamp(24px, 3.5vw, 36px);
}

.page-about .about-figure--checks {
  margin: clamp(28px, 4vw, 44px) 0 0;
}

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

/* ---------- 流程链路 ---------- */

.page-about .about-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .flow-node {
  padding: 16px 16px 18px;
  border-top: 2px solid var(--ink-line);
  background: linear-gradient(180deg, rgba(26, 36, 64, 0.5), rgba(6, 10, 23, 0));
  transition: border-color var(--t-fast) ease, box-shadow var(--t-fast) ease;
}

.page-about .flow-node:hover {
  border-top-color: rgba(52, 229, 212, 0.65);
  box-shadow: inset 0 1px 0 rgba(52, 229, 212, 0.25);
}

.page-about .flow-index {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .flow-title {
  margin: 9px 0 6px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .flow-text {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .flow-tag {
  display: inline-block;
  margin-top: 13px;
  padding: 3px 10px;
  font-size: 11px;
  letter-spacing: 0.1em;
  border-radius: 999px;
  border: 1px solid var(--ink-line);
  color: var(--dim);
}

.page-about .flow-tag--human {
  color: var(--violet);
  border-color: rgba(123, 92, 255, 0.5);
}

.page-about .flow-link {
  display: none;
  color: var(--dim);
}

/* ---------- 三道校验 ---------- */

.page-about .about-checks {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .check-row {
  padding-top: 18px;
  border-top: 1px solid var(--ink-line);
}

.page-about .check-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
}

.page-about .check-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .check-value {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  color: var(--cyan);
  text-shadow: 0 0 12px rgba(52, 229, 212, 0.35);
}

.page-about .check-value--trigger {
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--amber);
  text-shadow: none;
}

.page-about .check-bar {
  margin: 14px 0 12px;
  height: 6px;
  border-radius: 999px;
  background: var(--ink-glass);
  overflow: hidden;
}

.page-about .check-fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
}

.page-about .check-fill--full {
  width: 100%;
}

.page-about .check-fill--part {
  width: 15%;
}

.page-about .check-trigger {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 16px 0 12px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  border: 1px dashed rgba(255, 138, 61, 0.4);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.page-about .check-trigger-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 10px rgba(255, 138, 61, 0.6);
  flex: none;
}

.page-about .check-note {
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 四条内容线 ---------- */

.page-about .about-lines-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 40px);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-lines {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .line-item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 20px 0;
  border-top: 1px solid var(--ink-line);
}

.page-about .line-item:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .line-no {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--violet);
}

.page-about .line-title {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .line-text {
  grid-column: 2;
  margin: 7px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .line-text a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(52, 229, 212, 0.35);
}

.page-about .about-lines-map {
  min-width: 0;
}

.page-about .about-lines-map .media-frame {
  margin: 0;
  opacity: 0.62;
  filter: saturate(0.85);
}

.page-about .about-lines-map img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 编辑准则对照 ---------- */

.page-about .about-rules {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .rules-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--ink-line);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.1em;
}

.page-about .rules-col--do .rules-head {
  color: var(--cyan);
}

.page-about .rules-col--dont .rules-head {
  color: var(--muted);
}

.page-about .rules-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1px solid currentColor;
  font-size: 12px;
  line-height: 1;
  flex: none;
}

.page-about .rules-list {
  display: grid;
  gap: 17px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .rules-list li {
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .rules-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.85;
}

.page-about .rules-col--do .rules-list li::before {
  color: var(--cyan);
}

.page-about .rules-col--dont .rules-list li::before {
  color: var(--dim);
}

.page-about .rules-list strong {
  color: var(--paper);
  font-weight: 600;
}

/* ---------- 勘误路径 ---------- */

.page-about .about-erratum {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .err-item {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--ink-line);
}

.page-about .err-item:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .err-no {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .err-item .about-p {
  font-size: 15px;
  margin: 0;
  max-width: none;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.5vw, 34px);
}

/* ---------- 团队与版本 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 16px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .team-cell {
  padding-top: 16px;
  border-top: 1px solid var(--ink-line);
}

.page-about .team-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.6rem, 4vw, 2.1rem);
  line-height: 1;
  color: var(--paper);
  text-shadow: 0 0 12px rgba(52, 229, 212, 0.25);
}

.page-about .team-label {
  display: block;
  margin-top: 11px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-versions {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .ver-row {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 18px;
  align-items: baseline;
  padding: 16px 0;
  border-top: 1px solid var(--ink-line);
}

.page-about .ver-tag {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--violet);
}

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

.page-about .ver-text strong {
  font-family: var(--font-mono);
  color: var(--text-soft);
  font-weight: 600;
}

/* ---------- 返回顶部 ---------- */

.page-about .about-top {
  position: fixed;
  right: clamp(16px, 3vw, 34px);
  bottom: clamp(16px, 3vw, 30px);
  z-index: 30;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--ink-line);
  background: rgba(12, 20, 43, 0.82);
  backdrop-filter: blur(10px);
  color: var(--muted);
  text-decoration: none;
  transition: color var(--t-fast) ease, border-color var(--t-fast) ease, box-shadow var(--t-fast) ease;
}

.page-about .about-top:hover {
  color: var(--cyan);
  border-color: rgba(52, 229, 212, 0.6);
  box-shadow: inset 0 0 0 1px rgba(52, 229, 212, 0.35);
}

/* ---------- 中等宽度 ---------- */

@media (min-width: 700px) {
  .page-about .about-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 26px;
  }
}

@media (min-width: 760px) {
  .page-about .about-rules {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 42px;
  }
}

@media (min-width: 820px) {
  .page-about .about-cols {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: 18px 46px;
    align-items: start;
  }

  .page-about .about-cols > *:nth-child(even) {
    margin-top: 46px;
    padding-top: 20px;
    border-top: 1px solid var(--ink-line);
  }

  .page-about .about-checks {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }
}

@media (min-width: 980px) {
  .page-about {
    --about-rail: 56px;
  }

  .page-about .about-lines-wrap {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

@media (min-width: 1180px) {
  .page-about .about-flow {
    grid-template-columns: minmax(0, 1fr) 30px minmax(0, 1fr) 30px minmax(0, 1fr) 30px minmax(0, 1fr) 30px minmax(0, 1fr);
    gap: 0;
    align-items: stretch;
  }

  .page-about .flow-link {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 28px;
  }
}

/* ---------- 窄屏 ---------- */

@media (max-width: 560px) {
  .page-about {
    --about-rail: 30px;
  }

  .page-about .about-chapter > .section-mark {
    font-size: 12.5px;
    padding-top: 5px;
  }

  .page-about .about-chapter > .section-mark::after {
    height: 30px;
  }

  .page-about .line-item {
    grid-template-columns: 26px minmax(0, 1fr);
    gap: 4px 12px;
  }

  .page-about .err-item {
    grid-template-columns: 30px minmax(0, 1fr);
    gap: 10px;
  }

  .page-about .ver-row {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 12px;
  }

  .page-about .about-top {
    width: 40px;
    height: 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .flow-node,
  .page-about .about-top,
  .page-about .about-chapter > .section-mark {
    transition: none;
  }
}
<<<END>>>