.page-about {
  display: block;
  overflow-x: clip;
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-weight: var(--weight-body);
}

.page-about .about-open {
  padding-top: var(--space-4);
}

.page-about .breadcrumbs {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  letter-spacing: 0.04em;
  margin-bottom: var(--space-4);
}

.page-about .breadcrumbs a {
  color: var(--color-ink-soft);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--color-primary);
}

.page-about h1 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  margin: var(--space-2) 0 var(--space-4);
  max-width: 20ch;
  color: var(--color-ink);
}

.page-about h2 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  margin: 0 0 var(--space-3);
  max-width: 26ch;
}

.page-about h3 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  margin: 0 0 var(--space-3);
}

.page-about p {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-about .lede {
  max-width: var(--measure);
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin: 0 0 var(--space-2);
}

.page-about .eyebrow--invert {
  color: var(--color-primary-ink);
}

.page-about .band--contrast .eyebrow--invert {
  color: var(--color-contrast-accent);
}

/* ---------- 起源 ---------- */

.page-about .origin-stack {
  display: grid;
  gap: var(--space-4);
}

.page-about .origin-quote {
  margin: 0;
  padding-left: var(--space-3);
  max-width: 30ch;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-about .origin-body {
  display: grid;
  gap: var(--space-3);
  max-width: var(--measure);
}

.page-about .origin-body p {
  color: var(--color-ink-soft);
}

/* ---------- 服务范围 ---------- */

.page-about .about-scope h2,
.page-about .about-scope p {
  color: var(--color-primary-ink);
}

.page-about .scope-grid {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: 1fr;
}

.page-about .scope-main {
  display: grid;
  gap: var(--space-3);
  align-content: start;
}

.page-about .scope-side {
  background: color-mix(in srgb, var(--color-contrast-surface) 22%, transparent);
  padding: var(--space-4);
  border-radius: var(--radius-sm);
}

.page-about .scope-side-title {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  color: var(--color-primary-ink);
  margin-bottom: var(--space-3);
}

.page-about .scope-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
}

.page-about .scope-list li {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-primary-ink);
  padding-left: var(--space-3);
  position: relative;
}

.page-about .scope-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 10px;
  height: 2px;
  background: var(--color-primary-ink);
}

/* ---------- 做事方式 ---------- */

.page-about .about-method h2,
.page-about .about-method h3 {
  color: var(--color-contrast-ink);
}

.page-about .about-method p {
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}

.page-about .method-grid {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: 1fr;
  margin-top: var(--space-4);
}

.page-about .method-col {
  display: grid;
  gap: var(--space-3);
  align-content: start;
}

.page-about .method-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
  counter-reset: step;
}

.page-about .method-steps li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-3);
  align-items: start;
  padding: var(--space-3);
  background: color-mix(in srgb, var(--color-contrast-ink) 7%, transparent);
  border-radius: var(--radius-sm);
}

.page-about .step-num {
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-contrast-accent);
  line-height: 1;
}

.page-about .step-body {
  display: grid;
  gap: var(--space-1);
}

.page-about .step-title,
.page-about .note-title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  color: var(--color-contrast-ink);
}

.page-about .step-body p:not(.step-title) {
  font-size: var(--text-base);
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent);
}

.page-about .method-notes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.page-about .method-notes li {
  display: grid;
  gap: var(--space-1);
  padding-left: var(--space-3);
  position: relative;
}

.page-about .method-notes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
}

.page-about .method-notes li p:not(.note-title) {
  font-size: var(--text-base);
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent);
}

/* ---------- 版本迭代 ---------- */

.page-about .versions-head {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1fr;
  margin-bottom: var(--space-6);
}

.page-about .versions-intro p {
  max-width: var(--measure);
}

.page-about .versions-figure {
  margin: 0;
}

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

.page-about .iter-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
}

.page-about .iter-item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: var(--space-3);
  align-items: start;
  padding: var(--space-3);
  background: var(--color-surface-alt);
  border-radius: var(--radius-sm);
}

.page-about .iter-item:nth-child(even) {
  background: var(--color-surface-deep);
}

.page-about .iter-num {
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-primary);
  line-height: 1.1;
}

.page-about .iter-body {
  display: grid;
  gap: var(--space-1);
}

.page-about .iter-title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  color: var(--color-ink);
}

.page-about .iter-body p:not(.iter-title) {
  font-size: var(--text-base);
  color: var(--color-ink-soft);
}

/* ---------- 团队 ---------- */

.page-about .team-lede {
  max-width: var(--measure);
  margin-bottom: var(--space-6);
}

.page-about .team-bar {
  display: flex;
  flex-direction: column;
  width: 100%;
  margin-bottom: var(--space-6);
}

.page-about .team-seg {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--space-1);
  padding: var(--space-3);
  color: var(--color-primary-ink);
  transition: filter 240ms ease;
  min-width: 0;
}

.page-about .team-seg:hover {
  filter: brightness(1.12);
}

.page-about .team-seg--data {
  background: var(--color-primary);
}

.page-about .team-seg--edit {
  background: var(--color-accent);
}

.page-about .team-seg--tech {
  background: var(--color-contrast-surface);
}

.page-about .team-seg-num {
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: 1;
}

.page-about .team-seg-label {
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-primary-ink);
}

.page-about .team-grid {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1fr;
  align-items: start;
}

.page-about .team-figure {
  margin: 0;
}

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

.page-about .team-notes {
  display: grid;
  gap: var(--space-3);
}

.page-about .team-notes-key {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
  margin-right: 0.25em;
}

.page-about .team-notes-tail {
  padding: var(--space-3);
  background: var(--color-primary-soft);
  border-radius: var(--radius-sm);
  color: var(--color-ink);
}

/* ---------- 运行记录 ---------- */

.page-about .about-record h2 {
  color: var(--color-contrast-ink);
}

.page-about .about-record p {
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}

.page-about .record-grid {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: 1fr;
  align-items: start;
}

.page-about .record-main {
  display: grid;
  gap: var(--space-3);
  align-content: start;
}

.page-about .record-list {
  list-style: none;
  margin: var(--space-2) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
}

.page-about .record-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-3);
  align-items: baseline;
  padding-bottom: var(--space-2);
}

.page-about .record-list li + li {
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-about .record-value {
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  color: var(--color-contrast-accent);
  line-height: 1;
}

.page-about .record-label {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
}

.page-about .record-figure {
  margin: 0;
}

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

/* ---------- 三条路径 ---------- */

.page-about .about-paths {
  padding-bottom: calc(var(--section-y) + var(--space-6));
}

.page-about .about-paths h2 {
  color: var(--color-primary-ink);
  margin-bottom: var(--space-6);
}

.page-about .paths {
  display: grid;
  gap: var(--space-2);
  grid-template-columns: 1fr;
}

.page-about .path-item {
  display: grid;
  gap: var(--space-2);
  align-content: start;
  padding: var(--space-4) var(--space-3);
  background: var(--color-surface);
  color: var(--color-ink);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: background-color 260ms ease, color 260ms ease;
}

.page-about .path-item:hover,
.page-about .path-item:focus-visible {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-about .path-kicker {
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  color: var(--color-primary);
  transition: color 260ms ease;
}

.page-about .path-item:hover .path-kicker,
.page-about .path-item:focus-visible .path-kicker {
  color: var(--color-contrast-accent);
}

.page-about .path-title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-ink);
  transition: color 260ms ease;
}

.page-about .path-item:hover .path-title,
.page-about .path-item:focus-visible .path-title {
  color: var(--color-contrast-ink);
}

.page-about .path-desc {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  transition: color 260ms ease;
}

.page-about .path-item:hover .path-desc,
.page-about .path-item:focus-visible .path-desc {
  color: color-mix(in srgb, var(--color-contrast-ink) 80%, transparent);
}

.page-about .path-item:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
}

.page-about .paths-tail {
  margin-top: var(--space-4);
  max-width: var(--measure);
  color: var(--color-primary-ink);
}

.page-about .paths-tail a {
  color: var(--color-primary-ink);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-about .paths-tail a:hover,
.page-about .paths-tail a:focus-visible {
  color: var(--color-contrast-ink);
}

.page-about .paths-tail a:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .origin-quote,
  .page-about .origin-body {
    padding-left: var(--space-6);
  }

  .page-about .team-bar {
    flex-direction: row;
    height: 96px;
  }

  .page-about .team-seg--data {
    flex: 0 0 43.75%;
  }

  .page-about .team-seg--edit {
    flex: 0 0 31.25%;
  }

  .page-about .team-seg--tech {
    flex: 1 1 auto;
  }

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

@media (min-width: 900px) {
  .page-about .scope-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  }

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

  .page-about .versions-head {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .iter-item {
    grid-template-columns: 72px minmax(0, 1fr);
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: var(--space-6);
  }

  .page-about .record-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: center;
  }
}

@media (min-width: 1080px) {
  .page-about h1 {
    font-size: var(--text-3xl);
  }
}
<<<END>>>