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

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0;
}

.page-about a {
  color: inherit;
}

.page-about .breadcrumbs {
  margin-bottom: clamp(20px, 4vw, 40px);
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.82rem;
  color: var(--fog);
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(207, 201, 186, 0.5);
}

.page-about .breadcrumbs a {
  color: var(--fog);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

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

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--gold);
  margin: 0 0 14px;
  padding-left: 26px;
  position: relative;
}

.page-about .eyebrow::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 18px;
  height: 2px;
  background: var(--gold);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 5vw, 48px) 0 clamp(36px, 6vw, 72px);
  background:
    radial-gradient(120% 80% at 88% -12%, rgba(217, 164, 65, 0.18), transparent 62%),
    linear-gradient(165deg, #171B20 0%, #101317 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    116deg,
    rgba(245, 241, 230, 0.05) 0 1px,
    transparent 1px 11px
  );
  opacity: 0.6;
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-hero h1 {
  font-size: clamp(2.1rem, 7vw, 4.4rem);
  font-weight: 800;
  max-width: 16ch;
  margin-bottom: 20px;
}

.page-about .about-hero__lead {
  max-width: 38em;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(245, 241, 230, 0.86);
  margin: 0 0 26px;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-hero__facts li {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  font-size: 0.86rem;
  padding-bottom: 9px;
  border-bottom: 1px solid rgba(207, 201, 186, 0.18);
}

.page-about .about-hero__facts span {
  color: var(--fog);
  min-width: 4.5em;
}

.page-about .about-hero__facts strong {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--snow-hi);
  word-break: break-word;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__media {
  position: relative;
}

.page-about .about-hero__plate {
  position: absolute;
  left: 0;
  bottom: clamp(-10px, -1vw, 0px);
  transform: translateY(28%);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 18px;
  border-radius: var(--radius-md);
  background: var(--ink-card);
  border: 1px solid rgba(217, 164, 65, 0.35);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
}

.page-about .about-hero__year {
  font-family: var(--font-mono);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--gold);
  line-height: 1;
}

.page-about .about-hero__year-label {
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--fog);
}

.page-about .about-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink-soft);
  border: 1px solid rgba(207, 201, 186, 0.16);
}

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

.page-about .about-stats {
  list-style: none;
  margin: clamp(46px, 7vw, 76px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
}

.page-about .about-stats .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 16px;
  border-left: 2px solid rgba(217, 164, 65, 0.45);
}

.page-about .about-stats .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 5vw, 2.5rem);
  font-weight: 700;
  color: var(--snow-hi);
  line-height: 1;
}

.page-about .about-stats .stat:nth-child(1) .stat__value,
.page-about .about-stats .stat:nth-child(3) .stat__value {
  color: var(--gold);
}

.page-about .about-stats .stat__label {
  font-size: 0.78rem;
  color: var(--fog);
  letter-spacing: 0.02em;
}

/* ---------- 通用章节头 ---------- */

.page-about .about-head {
  max-width: 640px;
  margin-bottom: clamp(30px, 5vw, 52px);
}

.page-about .about-head h2 {
  font-size: clamp(1.55rem, 4.4vw, 2.6rem);
  font-weight: 800;
  margin-bottom: 16px;
}

.page-about .about-head__note {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.85;
  color: rgba(245, 241, 230, 0.78);
}

/* ---------- 运营脉络 ---------- */

.page-about .about-track-section {
  background: linear-gradient(180deg, var(--ink-deep) 0%, var(--ink) 100%);
}

.page-about .track {
  position: relative;
  display: grid;
  gap: 16px;
  padding-left: 30px;
}

.page-about .track::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold), rgba(217, 164, 65, 0.12));
}

.page-about .track__node {
  position: relative;
  padding: 18px 20px;
  border-radius: var(--radius-md);
  background: rgba(35, 42, 49, 0.55);
  border: 1px solid rgba(207, 201, 186, 0.14);
  transition: transform 0.28s var(--ease), border-color 0.28s var(--ease), background 0.28s var(--ease);
}

.page-about .track__node::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 22px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink-deep);
  border: 2px solid var(--gold);
  transition: background 0.28s var(--ease), transform 0.28s var(--ease);
}

.page-about .track__node:hover,
.page-about .track__node:focus-within {
  transform: translateY(-2px);
  border-color: rgba(217, 164, 65, 0.6);
  background: rgba(35, 42, 49, 0.9);
}

.page-about .track__node:hover::before {
  background: var(--gold);
  transform: scale(1.15);
}

.page-about .track__year {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .track__node h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.page-about .track__text {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.75;
  color: rgba(245, 241, 230, 0.72);
}

.page-about .about-track__foot {
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding-top: 20px;
  border-top: 1px solid rgba(217, 164, 65, 0.3);
  font-size: 0.9rem;
  line-height: 1.85;
  color: rgba(245, 241, 230, 0.78);
}

.page-about .about-track__foot a {
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(217, 164, 65, 0.45);
  transition: border-color 0.25s var(--ease);
}

.page-about .about-track__foot a:hover,
.page-about .about-track__foot a:focus-visible {
  border-bottom-color: var(--gold);
}

/* ---------- 服务能力树 ---------- */

.page-about .about-tree-section {
  background:
    radial-gradient(90% 70% at 100% 0%, rgba(45, 110, 159, 0.16), transparent 60%),
    var(--ink);
}

.page-about .about-tree__layout {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
}

.page-about .tree__root {
  display: inline-flex;
  align-items: center;
  margin: 0 0 22px;
  padding: 10px 20px;
  border-radius: 999px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--ink);
  background: linear-gradient(120deg, var(--gold-hi), var(--gold));
}

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

.page-about .tree__leaf {
  position: relative;
  padding: 16px 18px 16px 30px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(207, 201, 186, 0.16);
  background: rgba(35, 42, 49, 0.4);
  transition: transform 0.28s var(--ease), border-color 0.28s var(--ease);
}

.page-about .tree__leaf::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 24px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(217, 164, 65, 0.16);
}

.page-about .tree__leaf:hover {
  transform: translateY(-2px);
  border-color: rgba(217, 164, 65, 0.55);
}

.page-about .tree__leaf a {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--snow-hi);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .tree__leaf a:hover,
.page-about .tree__leaf a:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

.page-about .tree__leaf p {
  margin: 8px 0 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: rgba(245, 241, 230, 0.7);
}

.page-about .about-tree__aside {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .about-note {
  padding: 18px 20px;
  border-radius: var(--radius-md);
  border-left: 2px solid rgba(217, 164, 65, 0.6);
  background: linear-gradient(100deg, rgba(35, 42, 49, 0.75), rgba(35, 42, 49, 0.25));
}

.page-about .about-note h3 {
  font-size: 0.98rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--snow-hi);
}

.page-about .about-note p {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.75;
  color: rgba(245, 241, 230, 0.72);
}

/* ---------- 团队与客服 ---------- */

.page-about .about-team {
  background: var(--snow);
  color: var(--ink);
}

.page-about .about-team .eyebrow {
  color: var(--gold-deep);
}

.page-about .about-team .eyebrow::before {
  background: var(--gold-deep);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-team h2 {
  font-size: clamp(1.55rem, 4.4vw, 2.6rem);
  font-weight: 800;
  margin-bottom: 18px;
  color: var(--ink);
}

.page-about .about-team__copy p {
  max-width: 34em;
  font-size: 0.96rem;
  line-height: 1.85;
  color: rgba(21, 24, 28, 0.82);
  margin: 0 0 18px;
}

.page-about .about-team__contact {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid rgba(21, 24, 28, 0.16);
}

.page-about .about-team__contact li {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(21, 24, 28, 0.12);
  font-size: 0.9rem;
}

.page-about .about-team__label {
  min-width: 5.5em;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: rgba(21, 24, 28, 0.55);
  padding-top: 0.2em;
}

.page-about .about-team__contact a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid rgba(185, 134, 47, 0.5);
  word-break: break-word;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-team__contact a:hover,
.page-about .about-team__contact a:focus-visible {
  color: var(--gold-deep);
  border-bottom-color: var(--gold-deep);
}

.page-about .about-team__figure {
  border-color: rgba(21, 24, 28, 0.14);
  background: #E7E2D4;
  align-self: start;
}

.page-about .about-team__figure figcaption {
  padding: 14px 18px;
  font-size: 0.8rem;
  line-height: 1.7;
  color: rgba(21, 24, 28, 0.66);
  background: var(--snow-hi);
}

/* ---------- 视觉方法 ---------- */

.page-about .about-visual {
  background:
    radial-gradient(80% 60% at 10% 0%, rgba(178, 58, 50, 0.14), transparent 55%),
    radial-gradient(80% 60% at 95% 40%, rgba(45, 110, 159, 0.16), transparent 60%),
    var(--ink-deep);
}

.page-about .about-visual__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-visual__figure img {
  aspect-ratio: 2 / 1;
}

.page-about .swatches {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .swatch {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  background: rgba(35, 42, 49, 0.55);
  border: 1px solid rgba(207, 201, 186, 0.12);
}

.page-about .swatch__dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  grid-row: span 2;
}

.page-about .swatch__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--snow-hi);
}

.page-about .swatch__use {
  grid-column: 2;
  font-size: 0.78rem;
  color: var(--fog);
}

.page-about .swatch--blue .swatch__dot { background: var(--blue); }
.page-about .swatch--green .swatch__dot { background: var(--green); }
.page-about .swatch--red .swatch__dot { background: var(--red); }
.page-about .swatch--yellow .swatch__dot { background: var(--yellow); }
.page-about .swatch--gold .swatch__dot { background: var(--gold); }

.page-about .about-visual__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.85;
  color: rgba(245, 241, 230, 0.76);
}

/* ---------- 白皮书 ---------- */

.page-about .about-book {
  background: linear-gradient(180deg, var(--ink-deep) 0%, var(--ink) 100%);
}

.page-about .about-book__card {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding: clamp(24px, 4vw, 44px);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(130deg, rgba(217, 164, 65, 0.14), rgba(35, 42, 49, 0.6) 46%, rgba(35, 42, 49, 0.3));
  border: 1px solid rgba(217, 164, 65, 0.32);
}

.page-about .about-book h2 {
  font-size: clamp(1.5rem, 4vw, 2.3rem);
  font-weight: 800;
  margin-bottom: 16px;
}

.page-about .about-book__copy p:not(.eyebrow) {
  margin: 0 0 22px;
  font-size: 0.94rem;
  line-height: 1.85;
  color: rgba(245, 241, 230, 0.8);
  max-width: 34em;
}

.page-about .about-book__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .about-book__list li {
  display: grid;
  grid-template-columns: 2.4em minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  background: rgba(21, 24, 28, 0.6);
  border-left: 2px solid rgba(217, 164, 65, 0.7);
  font-size: 0.86rem;
  line-height: 1.75;
  color: rgba(245, 241, 230, 0.8);
}

.page-about .about-book__list span {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--gold);
}

/* ---------- 结尾 ---------- */

.page-about .about-cta {
  background: var(--ink);
  padding-bottom: clamp(48px, 7vw, 88px);
}

.page-about .about-cta__inner {
  padding: clamp(26px, 4vw, 44px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(207, 201, 186, 0.16);
  background: radial-gradient(100% 120% at 0% 0%, rgba(45, 110, 159, 0.18), transparent 60%);
  text-align: left;
}

.page-about .about-cta h2 {
  font-size: clamp(1.4rem, 4vw, 2.1rem);
  font-weight: 800;
  margin-bottom: 12px;
}

.page-about .about-cta p {
  margin: 0 0 24px;
  font-size: 0.92rem;
  line-height: 1.8;
  color: rgba(245, 241, 230, 0.76);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px 20px;
  }

  .page-about .about-hero__facts li {
    display: flex;
    flex-direction: column;
    gap: 4px;
    border-bottom: none;
    border-left: 1px solid rgba(207, 201, 186, 0.22);
    padding: 0 0 0 14px;
  }

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

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

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

  .page-about .about-book__list {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: center;
  }

  .page-about .about-hero__lead {
    font-size: 1.05rem;
  }

  .page-about .about-track__head,
  .page-about .about-head {
    max-width: 700px;
  }

  .page-about .track {
    display: flex;
    align-items: stretch;
    gap: 18px;
    padding-left: 0;
    padding-top: 34px;
  }

  .page-about .track::before {
    left: 0;
    right: 0;
    top: 6px;
    bottom: auto;
    width: auto;
    height: 2px;
    background: linear-gradient(90deg, rgba(217, 164, 65, 0.1), var(--gold) 22%, var(--gold) 78%, rgba(217, 164, 65, 0.1));
  }

  .page-about .track__node {
    flex: 1 1 0;
    min-width: 0;
  }

  .page-about .track__node:nth-child(1) { flex-grow: 1.35; }
  .page-about .track__node:nth-child(2) { flex-grow: 0.85; }
  .page-about .track__node:nth-child(3) { flex-grow: 1.2; }
  .page-about .track__node:nth-child(4) { flex-grow: 0.9; }
  .page-about .track__node:nth-child(5) { flex-grow: 1.05; }

  .page-about .track__node::before {
    left: 0;
    top: -34px;
  }

  .page-about .about-tree__layout {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 44px 46px;
    align-items: start;
  }

  .page-about .about-tree__layout .about-head {
    grid-column: 1 / -1;
    max-width: 640px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .about-visual__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    align-items: start;
  }

  .page-about .about-visual__figure img {
    aspect-ratio: 2 / 1;
    height: 100%;
  }

  .page-about .about-book__card {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: center;
  }

  .page-about .about-cta__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
    flex-wrap: wrap;
  }

  .page-about .about-cta h2 {
    margin-bottom: 8px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .track__node,
  .page-about .tree__leaf,
  .page-about .track__node::before {
    transition: none;
  }

  .page-about .track__node:hover,
  .page-about .tree__leaf:hover {
    transform: none;
  }
}