.page-about {
  --about-line-soft: rgba(27, 78, 112, 0.45);
  --about-glow: radial-gradient(120% 140% at 12% 0%, rgba(25, 230, 210, 0.16), transparent 58%);
  color: var(--mist);
  font-family: var(--font-sans);
  padding-bottom: 56px;
}

.page-about p {
  margin: 0 0 14px;
}

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

.page-about .breadcrumb {
  padding-top: 18px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .breadcrumb a {
  color: var(--sage);
  text-decoration: none;
}

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

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.24em;
  color: var(--cyan);
  margin: 0 0 10px;
}

.page-about .about-h2 {
  font-size: clamp(1.45rem, 5.4vw, 2.35rem);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0 0 14px;
  color: var(--mist);
}

.page-about .about-sub {
  max-width: 46ch;
  color: var(--muted);
  line-height: 1.78;
  margin: 0;
}

/* 首屏 */
.page-about .about-hero {
  padding-top: 26px;
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: start;
  padding-bottom: 28px;
}

.page-about .about-title {
  margin: 6px 0 20px;
  font-size: clamp(2rem, 8.8vw, 4.2rem);
  line-height: 1.04;
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--mist);
}

.page-about .about-title-kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.25em;
  font-weight: 500;
  letter-spacing: 0.3em;
  color: var(--cyan);
  margin-bottom: 1.1em;
}

.page-about .about-title-line {
  display: block;
}

.page-about .about-lede {
  max-width: 42ch;
  font-size: 1rem;
  line-height: 1.82;
  color: var(--sage);
}

.page-about .about-lede--dim {
  color: var(--muted);
  font-size: 0.94rem;
}

.page-about .about-hero-aside {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.page-about .annot {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.28em;
  color: var(--sage);
  margin: 2px 0 0;
  flex: none;
}

.page-about .about-hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 26px;
  margin: 0;
  flex: 1 1 auto;
}

.page-about .about-hero-facts dt {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .about-hero-facts dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--cyan);
  line-height: 1;
}

.page-about .about-hero-figure {
  margin: 4px 0 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--ink-2);
  box-shadow: var(--shadow-soft);
}

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

/* 品牌起点 */
.page-about .about-origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .about-origin-body {
  color: var(--sage);
  line-height: 1.82;
  max-width: 46ch;
}

.page-about .about-origin-body p + p {
  margin-top: 4px;
}

/* 时间轴 */
.page-about .about-section-head {
  margin-bottom: 22px;
}

.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 26px;
  position: relative;
}

.page-about .about-tl-item {
  position: relative;
  padding-left: 34px;
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 20px;
  bottom: -26px;
  width: 1px;
  background: linear-gradient(180deg, var(--line), var(--about-line-soft), transparent);
}

.page-about .about-tl-item:last-child::before {
  display: none;
}

.page-about .about-tl-node {
  position: absolute;
  left: 0;
  top: 6px;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  border: 2px solid var(--cyan);
  background: var(--ink);
  box-shadow: 0 0 0 4px rgba(25, 230, 210, 0.1);
  transition: box-shadow 180ms ease, border-color 180ms ease;
}

.page-about .about-tl-item:hover .about-tl-node,
.page-about .about-tl-item:focus-within .about-tl-node {
  border-color: var(--batch);
  box-shadow: 0 0 0 6px rgba(255, 209, 102, 0.16);
}

.page-about .about-tl-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--batch);
  margin-bottom: 6px;
}

.page-about .about-tl-item h3 {
  font-size: 1.06rem;
  font-weight: 700;
  line-height: 1.35;
  margin: 0 0 8px;
  color: var(--mist);
}

.page-about .about-tl-item p {
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
}

.page-about .about-tl-figure {
  margin: 30px 0 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--ink-2);
}

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

/* 团队 */
.page-about .about-crew {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-crew-item {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 22px 20px 20px;
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.page-about .about-crew-item:hover,
.page-about .about-crew-item:focus-within {
  transform: translateY(-2px);
  border-color: var(--cyan);
  box-shadow: 0 0 0 1px rgba(25, 230, 210, 0.55), var(--shadow-soft);
}

.page-about .about-crew-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 2.1rem;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  margin-bottom: 12px;
}

.page-about .about-crew-item h3 {
  font-size: 1.02rem;
  font-weight: 700;
  margin: 0 0 10px;
  color: var(--mist);
}

.page-about .about-crew-item p {
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
}

/* 归组方法 */
.page-about .about-method-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: start;
}

.page-about .about-method-copy {
  color: var(--sage);
  line-height: 1.82;
  max-width: 48ch;
}

.page-about .about-method-copy p {
  margin-bottom: 14px;
}

.page-about .about-chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 0;
  padding: 0;
}

.page-about .about-chips .chip {
  border: 1px solid var(--line);
  background: rgba(25, 230, 210, 0.08);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  transition: border-color 180ms ease, color 180ms ease, background 180ms ease;
}

.page-about .about-chips .chip:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(25, 230, 210, 0.14);
}

.page-about .about-method-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-stat {
  background: linear-gradient(165deg, var(--ink-2), var(--card));
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 16px 12px 14px;
}

.page-about .about-stat .mono {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  margin-bottom: 10px;
}

.page-about .about-stat p {
  font-size: 0.76rem;
  line-height: 1.6;
  color: var(--muted);
  margin: 0;
}

/* 合作生态 */
.page-about .about-partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  align-items: stretch;
}

.page-about .about-partner-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--ink-2);
}

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

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

.page-about .about-node {
  border-left: 2px solid var(--line);
  padding: 4px 0 4px 16px;
  transition: border-color 180ms ease;
}

.page-about .about-node:hover,
.page-about .about-node:focus-within {
  border-color: var(--cyan);
}

.page-about .about-node-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
  margin-bottom: 6px;
}

.page-about .about-node p {
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
}

.page-about .about-feedback {
  margin-top: 28px;
  padding: 22px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(167, 196, 181, 0.07);
}

.page-about .about-feedback-lead {
  font-size: 0.9rem;
  color: var(--sage);
  margin: 0 0 16px;
}

.page-about .about-feedback-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 14px;
  margin: 0;
}

.page-about .about-feedback-stats dt {
  font-size: 0.74rem;
  line-height: 1.5;
  color: var(--muted);
  margin-bottom: 6px;
}

.page-about .about-feedback-stats dd {
  margin: 0;
  font-size: 0.82rem;
  color: var(--sage);
}

.page-about .about-fb-num {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--mist);
  margin-right: 4px;
}

/* 咨询 */
.page-about .about-cta-panel {
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background:
    var(--about-glow),
    linear-gradient(160deg, var(--ink-2), var(--card));
  padding: 28px 20px 26px;
  display: grid;
  gap: 22px;
}

.page-about .about-cta-copy p {
  max-width: 48ch;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--sage);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
}

.page-about .about-cta-link {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--sage);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
  transition: color 180ms ease, border-color 180ms ease;
}

.page-about .about-cta-link:hover,
.page-about .about-cta-link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* 平板 */
@media (min-width: 700px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.85fr) minmax(0, 1fr);
    gap: 32px;
  }

  .page-about .about-hero-aside {
    border-top: none;
    border-left: 1px solid var(--line);
    padding-top: 0;
    padding-left: 18px;
  }

  .page-about .about-hero-facts {
    flex-direction: column;
    gap: 16px;
  }

  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.4fr);
    gap: 32px;
  }

  .page-about .about-crew {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-partner-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 26px;
  }

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

  .page-about .about-cta-panel {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: end;
    padding: 34px 32px 30px;
  }

  .page-about .about-cta-actions {
    justify-content: flex-end;
  }
}

/* 桌面：横向时间轴 */
@media (min-width: 960px) {
  .page-about {
    padding-bottom: 76px;
  }

  .page-about .about-tl {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
    padding-top: 30px;
    margin-top: 8px;
  }

  .page-about .about-tl::before {
    content: "";
    position: absolute;
    left: 2px;
    right: 2px;
    top: 9px;
    height: 1px;
    background: linear-gradient(90deg, var(--cyan), rgba(27, 78, 112, 0.5) 62%, transparent);
  }

  .page-about .about-tl-item {
    padding-left: 0;
    padding-top: 34px;
  }

  .page-about .about-tl-item::before {
    display: none;
  }

  .page-about .about-tl-node {
    left: 0;
    top: 0;
    width: 19px;
    height: 19px;
  }

  .page-about .about-tl-year {
    position: absolute;
    left: 28px;
    top: 1px;
    margin: 0;
  }

  .page-about .about-method-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 40px;
  }

  .page-about .about-method-stats {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .page-about .about-stat {
    padding: 18px 18px 16px;
  }

  .page-about .about-stat .mono {
    font-size: 1.9rem;
  }

  .page-about .about-stat p {
    font-size: 0.82rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-crew-item,
  .page-about .about-tl-node,
  .page-about .about-chips .chip,
  .page-about .about-node,
  .page-about .about-cta-link {
    transition: none;
  }

  .page-about .about-crew-item:hover,
  .page-about .about-crew-item:focus-within {
    transform: none;
  }
}