.page-about {
  --about-dim: var(--text-dim);
  --about-gap: 1.4rem;
  color: var(--text);
  padding-bottom: clamp(2.5rem, 6vw, 4.5rem);
  overflow-x: clip;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

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

.page-about .breadcrumb {
  padding-top: 1.4rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(1.8rem, 4vw, 3rem);
  padding-block: clamp(1.4rem, 3.5vw, 2.4rem) clamp(2rem, 5vw, 3.6rem);
  align-items: center;
}

.page-about .hero-kicker {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--electric);
  margin: 0 0 0.9rem;
}

.page-about .hero-title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2.1rem, 6vw, 4rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 0;
}

.page-about .hero-mark {
  font-style: normal;
  display: inline-block;
  border-bottom: 5px solid var(--signal);
  padding-bottom: 0.06em;
}

.page-about .hero-lead {
  margin: 1.3rem 0 0;
  max-width: 44ch;
  font-size: clamp(0.95rem, 1.6vw, 1.05rem);
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.6rem;
}

.page-about .hero-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1.1rem;
  margin: 1.8rem 0 0;
  padding: 0;
  list-style: none;
  font-size: 0.8rem;
  color: var(--text-dim);
}

.page-about .hero-legend .legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.page-about .hero-plate {
  position: relative;
  background: var(--paper);
  border: var(--line);
  padding: clamp(0.8rem, 2vw, 1.2rem);
  box-shadow: 10px 10px 0 -3px var(--ink-panel);
}

.page-about .hero-plate img {
  display: block;
  width: 100%;
}

.page-about .hero-stamp {
  position: absolute;
  top: -0.9rem;
  right: -0.4rem;
  background: var(--paper);
  z-index: 2;
}

.page-about .hero-coord {
  position: absolute;
  right: -1.4rem;
  bottom: 2.2rem;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.2em;
  color: var(--electric);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
    gap: clamp(2rem, 4vw, 3.4rem);
  }
}

/* ---------- 索引 + 档案 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(1.4rem, 3vw, 2.4rem);
  padding-block: clamp(1.6rem, 3.5vw, 2.6rem) 0;
}

.page-about .about-index {
  border: var(--line);
  background: var(--ink-panel);
  padding: 0.9rem 1rem;
}

.page-about .index-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--silver);
}

.page-about .index-list {
  list-style: none;
  margin: 0.7rem 0 0;
  padding: 0;
  display: flex;
  gap: 0.35rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .index-item {
  flex: 0 0 auto;
}

.page-about .index-link {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.4rem 0.6rem;
  font-size: 0.86rem;
  color: var(--text-dim);
  text-decoration: none;
  white-space: nowrap;
  border-left: 2px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.page-about .index-num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--electric);
}

.page-about .index-link:hover,
.page-about .index-link:focus-visible {
  color: var(--paper);
  background: rgba(46, 217, 208, 0.09);
  border-left-color: var(--electric);
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 14rem minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.2rem);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 5.5rem;
  }

  .page-about .index-list {
    display: block;
    overflow-x: visible;
    margin-top: 0.9rem;
  }

  .page-about .index-link {
    padding: 0.5rem 0.55rem;
    font-size: 0.9rem;
  }
}

.page-about .about-docs {
  display: grid;
  gap: clamp(1.4rem, 3vw, 2.2rem);
  min-width: 0;
}

/* ---------- 档案面板 ---------- */
.page-about .doc {
  border: var(--line);
  background: var(--ink-panel);
  padding: clamp(1.15rem, 3vw, 2.2rem);
  scroll-margin-top: 5.5rem;
}

.page-about .doc--paper {
  background: var(--paper);
  color: var(--on-light);
  --about-dim: #3c4c59;
}

.page-about .doc h2 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.45rem, 2.8vw, 2.15rem);
  line-height: 1.25;
  margin: 0.7rem 0 0;
}

.page-about .doc h3 {
  font-size: 1.08rem;
  font-weight: 800;
  line-height: 1.4;
  margin: 0.55rem 0 0.4rem;
}

.page-about .doc p {
  margin: 0.75rem 0 0;
  line-height: 1.85;
  color: var(--about-dim);
  max-width: 62ch;
}

.page-about .doc p a,
.page-about .doc li a {
  color: var(--electric);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .doc--paper p a,
.page-about .doc--paper li a {
  color: #0a5f6b;
}

.page-about .doc .section-label {
  margin: 0;
}

.page-about .doc--paper .section-label {
  color: #0a5f57;
  background: rgba(63, 199, 168, 0.18);
}

.page-about .doc-link {
  margin-top: 1.2rem !important;
  font-size: 0.88rem;
}

.page-about .about-points {
  list-style: none;
  margin: 1.3rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .about-points li {
  border-left: 3px solid var(--electric);
  padding: 0.15rem 0 0.15rem 0.9rem;
  line-height: 1.8;
  font-size: 0.93rem;
  color: var(--text-dim);
}

.page-about .about-points strong {
  color: var(--text);
  font-weight: 800;
  margin-right: 0.4rem;
}

.page-about .doc .figure-frame {
  margin: 1.2rem 0 0;
}

/* ---------- 版本时间轴 ---------- */
.page-about .tl {
  list-style: none;
  margin: 1.4rem 0 0;
  padding: 0 0 0 2rem;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 0.62rem;
  top: 0.6rem;
  bottom: 0.6rem;
  width: 2px;
  background: linear-gradient(180deg, var(--signal), var(--celadon) 55%, var(--electric));
}

.page-about .tl-node {
  position: relative;
  background: var(--ink);
  border: 1px solid var(--ink-line);
  padding: 0.9rem 1rem;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .tl-node + .tl-node {
  margin-top: 0.85rem;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -1.72rem;
  top: 1.25rem;
  width: 0.62rem;
  height: 0.62rem;
  border-radius: 50%;
  background: var(--electric);
  box-shadow: 0 0 0 4px rgba(46, 217, 208, 0.16);
}

.page-about .tl-node:nth-child(2)::before {
  background: var(--celadon);
  box-shadow: 0 0 0 4px rgba(63, 199, 168, 0.16);
}

.page-about .tl-node:nth-child(3)::before {
  background: var(--signal);
  box-shadow: 0 0 0 4px rgba(255, 106, 42, 0.16);
}

.page-about .tl-node:hover {
  transform: translateX(3px);
  border-color: var(--electric);
}

.page-about .tl-badge {
  margin: 0 !important;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--electric) !important;
}

.page-about .tl-node h3 {
  color: var(--text);
  margin-top: 0.35rem;
}

.page-about .tl-node p {
  color: var(--text-dim) !important;
  margin-top: 0.35rem;
  font-size: 0.9rem;
}

/* ---------- 价格三档 ---------- */
.page-about .tier-grid {
  display: grid;
  gap: 0.9rem;
  margin-top: 1.4rem;
}

.page-about .tier {
  background: var(--ink);
  border: 1px solid var(--ink-line);
  border-top-width: 4px;
  padding: 1rem 1.05rem 1.15rem;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.page-about .tier--standard {
  border-top-color: var(--electric);
}

.page-about .tier--advanced {
  border-top-color: var(--celadon);
}

.page-about .tier--team {
  border-top-color: var(--signal);
}

.page-about .tier:hover {
  transform: translateY(-4px);
  background: var(--ink-panel);
  border-color: var(--silver);
}

.page-about .tier-tag {
  margin: 0 !important;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--silver) !important;
}

.page-about .tier h3 {
  color: var(--text);
  font-size: 1.12rem;
  margin-top: 0.45rem;
}

.page-about .tier p {
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

.page-about .tier-note {
  font-family: var(--font-mono);
  font-size: 0.72rem !important;
  color: var(--text-dim) !important;
  border-top: 1px dashed var(--ink-line);
  padding-top: 0.6rem;
}

.page-about .tier-foot {
  font-size: 0.88rem;
  margin-top: 1.3rem !important;
}

@media (min-width: 720px) {
  .page-about .tier-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
  }
}

/* ---------- 发布与批次 ---------- */
.page-about .review-grid {
  display: grid;
  gap: 1.2rem;
  margin-top: 1.3rem;
  align-items: start;
}

.page-about .review-grid .figure-frame {
  margin: 0;
}

.page-about .review-list {
  margin: 0;
  display: grid;
  gap: 0.7rem;
}

.page-about .review-row {
  border: 1px solid rgba(11, 27, 43, 0.16);
  background: rgba(11, 27, 43, 0.04);
  padding: 0.65rem 0.8rem;
}

.page-about .review-row dt {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: #0a5f57;
}

.page-about .review-row dd {
  margin: 0.3rem 0 0;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--on-light);
}

@media (min-width: 700px) {
  .page-about .review-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 1.4rem;
  }
}

/* ---------- 团队与覆盖 ---------- */
.page-about .stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
  margin-top: 1.4rem;
}

.page-about .stat {
  border: var(--line);
  background: var(--ink);
  padding: 0.8rem 0.85rem;
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.45rem, 3.4vw, 2rem);
  font-weight: 600;
  line-height: 1.1;
  color: var(--electric);
}

.page-about .stat:nth-child(3n + 2) .stat-num {
  color: var(--signal);
}

.page-about .stat:nth-child(3n) .stat-num {
  color: var(--celadon);
}

.page-about .stat-label {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.76rem;
  line-height: 1.5;
  color: var(--text-dim);
}

@media (min-width: 640px) {
  .page-about .stat-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .stat-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.85rem;
  }
}

/* ---------- 荣誉 ---------- */
.page-about .honor-grid {
  display: grid;
  gap: 0.8rem;
  margin-top: 1.4rem;
}

.page-about .honor-item {
  border-left: 4px solid var(--signal);
  background: rgba(11, 27, 43, 0.05);
  padding: 0.75rem 0.9rem;
}

.page-about .honor-item p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--about-dim);
}

.page-about .honor-num {
  font-family: var(--font-mono);
  font-size: 1.35rem !important;
  font-weight: 600;
  color: var(--on-light) !important;
  margin-bottom: 0.25rem !important;
}

@media (min-width: 700px) {
  .page-about .honor-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 行动条 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 1.1rem;
  border: var(--line);
  background: linear-gradient(118deg, var(--ink-panel), var(--ink) 70%);
  padding: clamp(1.2rem, 3vw, 2rem);
  scroll-margin-top: 5.5rem;
}

.page-about .about-cta h2 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.3rem, 2.6vw, 1.9rem);
  margin: 0;
}

.page-about .about-cta p {
  margin: 0.55rem 0 0;
  color: var(--text-dim);
  line-height: 1.75;
  font-size: 0.92rem;
  max-width: 46ch;
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

@media (min-width: 780px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 1.6rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tier,
  .page-about .tl-node,
  .page-about .index-link {
    transition: none;
  }

  .page-about .tier:hover,
  .page-about .tl-node:hover {
    transform: none;
  }
}