.page-about {
  --about-line: rgba(21, 25, 28, 0.14);
  --about-dot: rgba(21, 25, 28, 0.045);
  background: var(--mist);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: clip;
  padding-bottom: 8px;
}

.page-about .about-crumbs {
  padding-top: 16px;
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--haze);
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--haze);
}

.page-about .breadcrumbs a {
  color: var(--rock);
  text-decoration: none;
  border-bottom: 1px solid var(--about-line);
}

.page-about .breadcrumbs a:hover {
  color: var(--orange-deep);
  border-bottom-color: var(--orange);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding-top: 16px;
}

.page-about .about-hero-frame {
  position: relative;
  background-color: var(--paper);
  background-image: radial-gradient(var(--about-dot) 1px, transparent 1px);
  background-size: 6px 6px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-panel);
  box-shadow: var(--shadow-panel);
  overflow: hidden;
}

.page-about .about-hero-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 16px;
  border-bottom: 1px dashed var(--about-line);
  background: linear-gradient(90deg, rgba(242, 101, 34, 0.1), rgba(31, 122, 140, 0.06) 70%, transparent);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
}

.page-about .about-hero-index {
  color: var(--orange-deep);
}

.page-about .about-hero-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--jialing);
}

.page-about .status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--jialing);
  box-shadow: 0 0 0 3px rgba(31, 122, 140, 0.16);
}

.page-about .about-hero-grid {
  display: grid;
  gap: 0;
}

.page-about .about-hero-copy {
  padding: 24px 18px 26px;
}

.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--haze);
}

.page-about h1 {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 31px;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-lede {
  margin: 0;
  max-width: 30em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--rock);
}

.page-about .about-hero-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 22px 0 22px;
  padding: 0;
  list-style: none;
}

.page-about .about-hero-meta li {
  padding: 10px 12px;
  background: var(--mist);
  border-left: 3px solid var(--orange);
  border-radius: 12px;
}

.page-about .about-hero-meta li:nth-child(2n) {
  border-left-color: var(--jialing);
}

.page-about .about-hero-meta b {
  display: block;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-about .about-hero-meta span {
  display: block;
  margin-top: 3px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--haze);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius-chip);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: transform 0.18s ease, background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.page-about .btn--primary {
  background: var(--orange);
  color: var(--ink);
}

.page-about .btn--primary:hover,
.page-about .btn--primary:focus-visible {
  transform: translateY(-2px);
  background: #ff7a3d;
}

.page-about .btn--ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--about-line);
}

.page-about .btn--ghost:hover,
.page-about .btn--ghost:focus-visible {
  border-color: var(--orange);
  color: var(--orange-deep);
}

.page-about .about-hero-figure {
  position: relative;
  margin: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 10;
}

.page-about .about-hero-figure figcaption {
  position: absolute;
  left: 12px;
  bottom: 12px;
  padding: 4px 10px;
  border-radius: var(--radius-chip);
  background: rgba(18, 58, 77, 0.82);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
}

/* ---------- 主体两栏 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 22px;
  padding: 26px 0 56px;
}

.page-about .about-toc {
  padding: 12px 12px 8px;
  background: var(--paper);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-card);
}

.page-about .about-toc-title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--haze);
}

.page-about .about-toc-list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-toc-list a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 8px;
  border-left: 2px solid transparent;
  border-radius: 8px;
  font-size: 14px;
  color: var(--rock);
  text-decoration: none;
  transition: background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}

.page-about .toc-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--haze);
}

.page-about .about-toc-list a:hover {
  background: var(--mist);
  color: var(--ink);
}

.page-about .about-toc-list a[aria-current="true"] {
  background: var(--orange-veil);
  border-left-color: var(--orange);
  color: var(--ink);
  font-weight: 700;
}

.page-about .about-toc-list a[aria-current="true"] .toc-num {
  color: var(--orange-deep);
}

/* ---------- 档案卡 ---------- */
.page-about .about-sec {
  position: relative;
  margin-bottom: 18px;
  padding: 20px 16px 24px;
  background: var(--paper);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-panel);
  box-shadow: var(--shadow-panel);
  scroll-margin-top: 96px;
}

.page-about .about-sec-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft, rgba(21, 25, 28, 0.08));
}

.page-about .about-sec-num {
  flex: none;
  padding: 3px 9px;
  border-radius: var(--radius-chip);
  background: var(--orange-veil);
  color: var(--orange-deep);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.page-about .about-sec h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  line-height: 1.32;
  letter-spacing: -0.01em;
}

.page-about .about-sec p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--rock);
}

.page-about .about-sec p:last-child {
  margin-bottom: 0;
}

.page-about .about-sec a {
  color: var(--orange-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--orange-veil);
}

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

.page-about .about-definition {
  display: grid;
  gap: 8px;
  margin: 18px 0;
  padding: 16px 16px 16px 18px;
  background: var(--mist);
  border-left: 4px solid var(--jialing);
  border-radius: 4px 18px 18px 4px;
}

.page-about .about-definition-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--jialing);
}

.page-about .about-definition p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
  font-weight: 600;
}

/* ---------- 通道坡道 ---------- */
.page-about .about-routes-wrap {
  display: grid;
  gap: 18px;
  margin-top: 16px;
}

.page-about .about-routes {
  display: grid;
  gap: 14px;
}

.page-about .route-band {
  --band: var(--orange);
  position: relative;
  background: var(--paper);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.page-about .route-band--a { --band: var(--orange); }
.page-about .route-band--b { --band: var(--jialing); }
.page-about .route-band--c { --band: var(--gold); }
.page-about .route-band--d { --band: var(--deep); }

.page-about .route-band-inner {
  padding: 15px 15px 15px 17px;
  border-left: 6px solid var(--band);
}

.page-about .route-band:hover {
  border-color: var(--orange);
  box-shadow: 0 14px 26px -22px rgba(21, 25, 28, 0.8);
}

.page-about .route-head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .route-code {
  padding: 2px 9px;
  border: 1px solid var(--band);
  border-radius: var(--radius-chip);
  color: var(--band);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.page-about .route-head h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
}

.page-about .route-band p {
  margin: 10px 0 12px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--rock);
}

.page-about .route-toggle {
  padding: 0 0 2px;
  background: none;
  border: none;
  border-bottom: 1px solid var(--orange-veil);
  color: var(--orange-deep);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  cursor: pointer;
}

.page-about .route-toggle:hover {
  border-bottom-color: var(--orange);
}

.page-about .route-body {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--about-line);
}

.page-about .route-body ul {
  margin: 0;
  padding-left: 18px;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--rock);
}

.page-about .about-route-figure {
  position: relative;
  margin: 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--about-line);
}

.page-about .about-route-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

.page-about .about-route-figure figcaption {
  position: absolute;
  left: 12px;
  bottom: 12px;
  padding: 4px 10px;
  border-radius: var(--radius-chip);
  background: rgba(18, 58, 77, 0.82);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
}

/* ---------- 内容与更新 ---------- */
.page-about .about-content-figure {
  margin: 16px 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--about-line);
}

.page-about .about-content-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 8 / 5;
}

.page-about .about-content-figure figcaption {
  padding: 8px 12px;
  background: var(--mist);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--haze);
}

.page-about .about-update-grid {
  display: grid;
  gap: 10px;
  margin: 18px 0;
}

.page-about .about-update-item {
  padding: 13px 14px;
  background: var(--mist);
  border-radius: 14px;
  border-top: 2px solid var(--jialing);
}

.page-about .about-update-key {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--jialing);
}

.page-about .about-update-item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--rock);
}

/* ---------- 团队 ---------- */
.page-about .team-stage {
  display: grid;
  gap: 12px;
  margin: 18px 0;
}

.page-about .team-blob {
  padding: 20px 18px;
  border-radius: 58% 42% 46% 54% / 46% 54% 46% 54%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  min-height: 122px;
}

.page-about .team-blob h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
}

.page-about .team-blob p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
}

.page-about .team-blob--content {
  background: var(--orange-veil);
  border-radius: 54% 46% 40% 60% / 52% 44% 56% 48%;
}

.page-about .team-blob--content p {
  color: var(--rock);
}

.page-about .team-blob--product {
  background: var(--mist-2);
}

.page-about .team-blob--product p {
  color: var(--rock);
}

.page-about .team-blob--tech {
  background: rgba(31, 122, 140, 0.14);
  border-radius: 46% 54% 58% 42% / 44% 56% 44% 56%;
}

.page-about .team-blob--tech p {
  color: var(--rock);
}

.page-about .team-blob--service {
  background: var(--deep);
  color: var(--paper);
  border-radius: 60% 40% 52% 48% / 50% 58% 42% 50%;
}

.page-about .team-blob--service p {
  color: rgba(251, 250, 247, 0.84);
}

/* ---------- 协作徽标墙 ---------- */
.page-about .partner-wall {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 18px 0;
}

.page-about .partner-cell {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 13px 12px;
  background: var(--mist);
  border: 1px dashed var(--about-line);
  border-radius: 14px;
  transition: transform 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-about .partner-cell:hover,
.page-about .partner-cell:focus-visible {
  transform: translateY(-3px);
  border-color: var(--orange);
  border-style: solid;
  background: var(--paper);
  outline: none;
}

.page-about .partner-glyph {
  width: 24px;
  height: 24px;
  border: 2px solid var(--jialing);
  border-radius: 6px 14px 6px 14px;
}

.page-about .partner-cell:nth-child(2n) .partner-glyph {
  border-radius: 14px 6px 14px 6px;
  border-color: var(--orange);
}

.page-about .partner-cell:nth-child(3n) .partner-glyph {
  border-radius: 50% 50% 6px 50%;
  transform: rotate(12deg);
}

.page-about .partner-name {
  font-size: 13.5px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .partner-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.03em;
  color: var(--haze);
}

.page-about .partner-cell:hover .partner-tag,
.page-about .partner-cell:focus-visible .partner-tag {
  color: var(--orange-deep);
}

/* ---------- 运营主体 ---------- */
.page-about .entity-grid {
  display: grid;
  gap: 12px;
  margin: 18px 0 16px;
}

.page-about .entity-card {
  padding: 16px 15px;
  background: var(--mist);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-card);
}

.page-about .entity-card--accent {
  background: var(--paper);
  border-color: var(--orange-veil);
  border-left: 4px solid var(--orange);
}

.page-about .entity-label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--haze);
}

.page-about .entity-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .entity-list li {
  display: grid;
  grid-template-columns: 5em minmax(0, 1fr);
  gap: 8px;
  align-items: baseline;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--about-line);
}

.page-about .entity-list li:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.page-about .contact-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--haze);
}

.page-about .contact-val {
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink);
  word-break: break-word;
}

.page-about .entity-note {
  margin: 14px 0 14px;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--rock);
}

.page-about .about-entity-foot {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--rock);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero-copy {
    padding: 30px 28px 32px;
  }

  .page-about h1 {
    font-size: 38px;
  }

  .page-about .about-hero-meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-sec {
    padding: 24px 22px 28px;
  }

  .page-about .about-sec h2 {
    font-size: 23px;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 20px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: stretch;
  }

  .page-about h1 {
    font-size: 44px;
  }

  .page-about .about-hero-figure {
    border-top: none;
    border-left: 1px solid var(--about-line);
  }

  .page-about .about-hero-figure img {
    height: 100%;
    aspect-ratio: auto;
  }

  .page-about .about-layout {
    grid-template-columns: 218px minmax(0, 1fr);
    gap: 40px;
    padding: 34px 0 68px;
  }

  .page-about .about-toc {
    position: sticky;
    top: 92px;
    padding: 14px 14px 10px;
  }

  .page-about .about-sec {
    padding: 28px 28px 32px;
    border-radius: 28px;
  }

  .page-about .about-sec--routes {
    margin-left: 20px;
  }

  .page-about .about-sec--team {
    margin-left: 44px;
  }

  .page-about .about-sec--entity {
    margin-left: 12px;
  }

  .page-about .about-sec h2 {
    font-size: 26px;
  }

  .page-about .about-sec p {
    font-size: 15.5px;
    max-width: 46em;
  }

  /* 四条坡道：倾斜条带 + 错位阶梯 */
  .page-about .about-routes {
    gap: 12px;
    padding-right: 8px;
  }

  .page-about .route-band {
    transform: rotate(-1.5deg);
    transform-origin: left center;
  }

  .page-about .route-band:nth-child(1) { margin-left: 0; }
  .page-about .route-band:nth-child(2) { margin-left: 18px; }
  .page-about .route-band:nth-child(3) { margin-left: 36px; }
  .page-about .route-band:nth-child(4) { margin-left: 54px; }

  .page-about .route-band-inner {
    transform: rotate(1.5deg);
    transform-origin: left center;
  }

  .page-about .about-routes-wrap {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 24px;
    align-items: start;
  }

  /* 团队同心色块 */
  .page-about .team-stage {
    grid-template-columns: 1.12fr 0.88fr;
    gap: 14px;
  }

  .page-about .team-blob {
    min-height: 150px;
  }

  .page-about .team-blob--content {
    grid-row: span 2;
    min-height: 314px;
    padding: 28px 24px;
  }

  .page-about .team-blob--content h3 {
    font-size: 19px;
  }

  .page-about .team-blob--content p {
    font-size: 14px;
  }

  /* 协作墙 */
  .page-about .partner-wall {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  /* 运营卡 */
  .page-about .entity-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 16px;
  }

  .page-about .entity-card {
    padding: 20px 18px;
  }
}

@media (min-width: 1120px) {
  .page-about h1 {
    font-size: 48px;
  }

  .page-about .about-sec--origin {
    margin-right: 40px;
  }

  .page-about .about-sec--content {
    margin-right: 24px;
  }

  .page-about .about-sec--partners {
    margin-right: 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .route-band,
  .page-about .route-band-inner,
  .page-about .btn,
  .page-about .partner-cell,
  .page-about .about-toc-list a {
    transform: none !important;
    transition: opacity 0.16s ease;
  }
}