.page-about {
  --about-rail-w: 152px;
  --about-gap: 28px;
  background: var(--warm-white);
  color: var(--deep-teal);
  padding-bottom: clamp(56px, 7vw, 96px);
}

.page-about .about-top {
  padding-top: 18px;
}

.page-about .about-layout {
  display: grid;
  gap: var(--about-gap);
  padding-top: 10px;
}

/* ---------- 左侧航标刻度 ---------- */
.page-about .about-rail {
  position: relative;
  border-bottom: 1px solid var(--hair-light);
  padding-bottom: 12px;
}

.page-about .rail-label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--stone);
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .rail-list::-webkit-scrollbar {
  display: none;
}

.page-about .rail-list li {
  flex: 0 0 auto;
}

.page-about .rail-list a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 13px;
  border-radius: var(--r-pill);
  background: var(--chart-mint);
  color: var(--deep-teal);
  font-size: 13px;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.28s var(--ease), color 0.28s var(--ease);
}

.page-about .rail-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--clay);
  transition: color 0.28s var(--ease);
}

.page-about .rail-list a:hover,
.page-about .rail-list a:focus-visible {
  background: var(--deep-teal);
  color: var(--warm-white);
}

.page-about .rail-list a:hover .rail-num,
.page-about .rail-list a:focus-visible .rail-num {
  color: var(--amber);
}

/* ---------- 首屏 ---------- */
.page-about .about-lead {
  display: grid;
  gap: 26px;
}

.page-about .about-title {
  margin: 0.3em 0 0.42em;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2rem, 5.4vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--deep-teal);
}

.page-about .title-mark {
  background: linear-gradient(transparent 62%, rgba(242, 107, 42, 0.34) 62%);
  padding-bottom: 0.04em;
}

.page-about .about-lede {
  max-width: 44ch;
  color: var(--stone);
  font-size: 16px;
  line-height: 1.78;
  margin: 0;
}

.page-about .about-stats {
  list-style: none;
  margin: 26px 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--hair-light);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-stats li {
  background: var(--warm-white);
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-stats .num {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3.2vw, 1.85rem);
  font-weight: 500;
  line-height: 1;
  color: var(--deep-teal);
}

.page-about .stat-label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--stone);
}

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

.page-about .about-lead-figure .figure-frame {
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--deep-teal);
  aspect-ratio: 14 / 9;
}

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

.page-about .figure-caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--stone);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  margin-top: clamp(52px, 7vw, 92px);
  padding-top: clamp(26px, 3.4vw, 42px);
  border-top: 1px solid var(--hair-light);
}

.page-about .about-h2 {
  margin: 0.28em 0 0.5em;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--deep-teal);
}

.page-about .about-copy {
  margin: 0;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 01 栏目网格 ---------- */
.page-about .channel-grid {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .channel {
  display: grid;
  gap: 6px;
  height: 100%;
  padding: 18px 18px 20px;
  border-radius: var(--r-md);
  background: var(--chart-mint);
  color: var(--deep-teal);
  text-decoration: none;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .channel:hover,
.page-about .channel:focus-visible {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
  background: #ffffff;
}

.page-about .channel-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--clay);
}

.page-about .channel-name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.page-about .channel-desc {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 02 维护方法 ---------- */
.page-about .method-grid {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

.page-about .method-card {
  border-radius: var(--r-lg);
  padding: clamp(22px, 3vw, 32px);
}

.page-about .method-card--dark {
  background: var(--deep-teal);
  color: var(--warm-white);
}

.page-about .method-card--mint {
  background: var(--chart-mint);
  color: var(--deep-teal);
}

.page-about .method-tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .method-card--mint .method-tag {
  color: var(--clay);
}

.page-about .method-title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.2vw, 1.4rem);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.page-about .method-body {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--on-dark);
}

.page-about .method-card--mint .method-body {
  color: var(--stone);
}

.page-about .method-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 6px;
  padding: 10px 18px;
  border-radius: var(--r-pill);
  background: var(--signal);
  color: var(--ink-teal);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  min-height: 44px;
  transition: transform 0.28s var(--ease), background 0.28s var(--ease);
}

.page-about .method-link--dark {
  background: var(--deep-teal);
  color: var(--warm-white);
}

.page-about .method-link:hover,
.page-about .method-link:focus-visible {
  transform: translateY(-2px);
  background: var(--amber);
  color: var(--ink-teal);
}

/* ---------- 03 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.page-about .team-card {
  border-radius: var(--r-lg);
  padding: 24px 22px 26px;
  background: var(--warm-white);
  border: 1px solid var(--hair-light);
  transition: transform 0.32s var(--ease), border-color 0.32s var(--ease), box-shadow 0.32s var(--ease);
}

.page-about .team-card:hover {
  transform: translateY(-4px);
  border-color: var(--signal);
  box-shadow: var(--shadow-card);
}

.page-about .team-role {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--moss);
}

.page-about .team-name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--deep-teal);
}

.page-about .team-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--stone);
}

.page-about .team-note {
  margin-top: 20px;
  padding-left: 18px;
  border-left: 3px solid var(--amber);
}

.page-about .about-team-figure {
  margin: 24px 0 0;
}

.page-about .about-team-figure .figure-frame {
  border-radius: var(--r-md);
  overflow: hidden;
  aspect-ratio: 10 / 7;
  background: var(--chart-mint);
}

/* ---------- 04 版本时间轴 ---------- */
.page-about .version-track {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .version {
  position: relative;
  padding: 22px 18px 24px;
  border-radius: var(--r-md);
  border-top: 2px solid var(--mist);
  background: transparent;
}

.page-about .version::before {
  content: "";
  position: absolute;
  top: -8px;
  left: 18px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--warm-white);
  border: 2px solid var(--signal);
}

.page-about .version--current {
  background: var(--deep-teal);
  border-top-color: var(--signal);
}

.page-about .version--current::before {
  background: var(--signal);
  border-color: var(--signal);
}

.page-about .version-tag {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--clay);
}

.page-about .version--current .version-tag {
  color: var(--amber);
}

.page-about .version-name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--deep-teal);
}

.page-about .version--current .version-name {
  color: var(--warm-white);
}

.page-about .version-desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--stone);
}

.page-about .version--current .version-desc {
  color: var(--on-dark);
}

/* ---------- 05 资质与荣誉 ---------- */
.page-about .cred-grid {
  display: grid;
  gap: 22px;
  margin-top: 28px;
}

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

.page-about .cred-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 16px 18px;
  border-radius: var(--r-md);
  background: var(--chart-mint);
}

.page-about .cred-mark {
  width: 10px;
  height: 10px;
  margin-top: 7px;
  border-radius: 2px;
  background: var(--signal);
  transform: rotate(45deg);
}

.page-about .cred-name {
  margin: 0 0 5px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  color: var(--deep-teal);
}

.page-about .cred-desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--stone);
}

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

.page-about .about-cred-figure .figure-frame {
  border-radius: var(--r-lg);
  overflow: hidden;
  aspect-ratio: 1 / 1;
  background: var(--ink-teal);
}

/* ---------- 06 移动适配 ---------- */
.page-about .principles {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--hair-light);
}

.page-about .principle {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--hair-light);
}

.page-about .principle-key {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--signal);
}

.page-about .principle-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--stone);
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta {
  margin-top: clamp(52px, 7vw, 92px);
  border-radius: var(--r-lg);
  background: var(--deep-teal);
  color: var(--warm-white);
  padding: clamp(26px, 4vw, 44px);
  display: grid;
  gap: 22px;
}

.page-about .cta-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 2.6vw, 1.85rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--warm-white);
}

.page-about .cta-text {
  margin: 0;
  max-width: 52ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--on-dark);
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.page-about .cta-actions .btn {
  min-height: 44px;
}

.page-about .cta-secondary {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 20px;
  border-radius: var(--r-pill);
  border: 1px solid var(--hair-dark);
  color: var(--warm-white);
  font-size: 14px;
  text-decoration: none;
  transition: border-color 0.28s var(--ease), background 0.28s var(--ease);
}

.page-about .cta-secondary:hover,
.page-about .cta-secondary:focus-visible {
  border-color: var(--amber);
  background: rgba(245, 184, 75, 0.12);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .channel-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .principle {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }
}

@media (min-width: 880px) {
  .page-about .channel-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .method-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: stretch;
  }

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

  .page-about .cred-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
    gap: 28px;
  }

  .page-about .version-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 28px;
  }
}

@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
    border-bottom: 0;
    border-left: 1px solid var(--hair-light);
    padding: 4px 0 4px 16px;
    max-height: calc(100vh - 140px);
    overflow-y: auto;
  }

  .page-about .rail-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-about .rail-list a {
    width: 100%;
    justify-content: flex-start;
    padding: 9px 10px;
    border-radius: var(--r-sm);
    background: transparent;
    position: relative;
  }

  .page-about .rail-list a::before {
    content: "";
    position: absolute;
    left: -17px;
    top: 50%;
    width: 8px;
    height: 1px;
    background: var(--mist);
    transition: width 0.28s var(--ease), background 0.28s var(--ease);
  }

  .page-about .rail-list a:hover::before,
  .page-about .rail-list a:focus-visible::before {
    width: 13px;
    background: var(--signal);
  }
}

@media (min-width: 1040px) {
  .page-about .about-lead {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 40px;
    align-items: end;
  }

  .page-about .about-team-figure {
    margin-top: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .channel,
  .page-about .team-card,
  .page-about .method-link,
  .page-about .cta-secondary,
  .page-about .rail-list a,
  .page-about .rail-list a::before {
    transition: none;
  }

  .page-about .channel:hover,
  .page-about .team-card:hover,
  .page-about .method-link:hover {
    transform: none;
  }
}