.page-about {
  position: relative;
  --about-line: rgba(255, 255, 255, 0.06);
  --about-card-radius: 0.5rem;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about h1,
.page-about h2,
.page-about h3,
.page-about h4,
.page-about p {
  margin-top: 0;
}

.page-about .breadcrumb {
  padding: 1rem 1.25rem 0;
}

/* 章节通用头 */
.page-about .section-head {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.5rem;
  position: relative;
}

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

.page-about .section-index {
  font-family: var(--font-mono);
  font-size: clamp(2.4rem, 10vw, 5rem);
  font-weight: 700;
  line-height: 0.92;
  color: transparent;
  -webkit-text-stroke: 1px rgba(201, 162, 39, 0.7);
  white-space: nowrap;
  pointer-events: none;
  user-select: none;
}

.page-about .section-kicker {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold-bright);
  margin-bottom: 0.35rem;
}

.page-about .section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 4vw, 2.4rem);
  line-height: 1.15;
  letter-spacing: 0.01em;
  color: var(--text-primary);
  margin-bottom: 0;
}

.page-about .section-head h2:hover,
.page-about .section-head h2:focus-visible {
  color: var(--gold-bright);
}

/* 各章节通用留白 */
.page-about .about-hero,
.page-about .about-evo,
.page-about .about-cap,
.page-about .about-gov,
.page-about .about-trust {
  padding: 2.5rem 1.25rem;
  position: relative;
}

/* 01 品牌定位 Hero */
.page-about .about-hero {
  overflow: hidden;
  background:
    radial-gradient(circle at 12% 20%, rgba(201, 162, 39, 0.1) 0%, transparent 30%),
    linear-gradient(135deg, rgba(62, 180, 212, 0.06) 0%, transparent 50%),
    var(--bg-deep);
}

.page-about .about-hero__index {
  position: absolute;
  top: 0.5rem;
  right: 1rem;
  font-family: var(--font-mono);
  font-size: clamp(5rem, 18vw, 10rem);
  font-weight: 800;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 255, 255, 0.08);
  pointer-events: none;
  user-select: none;
  z-index: 0;
}

.page-about .about-hero__lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.65;
  z-index: 0;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 2rem;
  position: relative;
  z-index: 1;
}

.page-about .about-hero__main {
  max-width: 46rem;
}

.page-about .about-h1-sep {
  color: var(--gold);
  font-weight: 400;
  padding: 0 0.2em;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 5.6vw, 3.4rem);
  line-height: 1.12;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  letter-spacing: 0.01em;
}

.page-about .about-hero__lead {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text-primary);
  margin-bottom: 1rem;
  border-left: 3px solid var(--gold);
  padding-left: 1rem;
}

.page-about .about-hero__main p:not(.section-kicker):not(.about-hero__lead) {
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 0.9rem;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.page-about .about-hero__visual {
  position: relative;
  min-width: 0;
}

.page-about .about-hero__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--border-fine);
  border-radius: 6px;
  margin-bottom: 1rem;
}

.page-about .about-hero__stamp {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  padding: 0.75rem 1rem;
  background: var(--action);
  color: #0A1428;
  font-family: var(--font-display);
  line-height: 1.05;
  min-width: 6.5rem;
  border-radius: 2px;
}

.page-about .about-hero__stamp span {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  font-family: var(--font-mono);
}

.page-about .about-hero__stamp strong {
  font-size: 1.5rem;
  text-transform: uppercase;
}

/* 02 版本演进 */
.page-about .about-evo {
  border-top: 1px solid var(--border-fine);
  border-bottom: 1px solid var(--border-fine);
  background:
    linear-gradient(120deg, rgba(62, 180, 212, 0.1) 0%, transparent 55%),
    var(--bg-deep);
}

.page-about .about-evo__intro {
  max-width: 46rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 1.5rem;
}

.page-about .about-evo__map {
  position: relative;
  margin-bottom: 1.75rem;
  overflow: hidden;
  border: 1px solid var(--border-fine);
  border-radius: var(--about-card-radius);
}

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

.page-about .about-evo__grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(62, 180, 212, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(62, 180, 212, 0.12) 1px, transparent 1px);
  background-size: 32px 32px;
  mix-blend-mode: screen;
}

.page-about .about-timeline {
  position: relative;
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  padding: 1rem 0.25rem 1.5rem;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-tl {
  flex: 0 0 260px;
  scroll-snap-align: start;
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-fine);
  border-radius: var(--about-card-radius);
  padding: 1rem 1.25rem 1.25rem;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  top: -0.625rem;
  left: 1.25rem;
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
  background: var(--gold);
  border: 2px solid var(--bg-deep);
}

.page-about .about-tl:hover {
  border-color: rgba(62, 180, 212, 0.5);
  box-shadow: var(--shadow-soft);
  transform: translateY(-2px);
}

.page-about .about-tl--active {
  border-color: rgba(201, 162, 39, 0.6);
  box-shadow: var(--shadow-soft);
}

.page-about .about-tl--active::before {
  background: var(--action);
  transform: scale(1.2);
  transform-origin: center;
}

.page-about .about-tl h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  line-height: 1.2;
  margin: 0.5rem 0 0.5rem;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.page-about .about-tl p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.7;
  margin-bottom: 0.75rem;
}

.page-about .about-tl__tag {
  display: inline-block;
  padding: 0.25rem 0.6rem;
  border: 1px solid var(--border-fine);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.page-about .about-tl--active .about-tl__tag {
  border-color: rgba(201, 162, 39, 0.4);
  color: var(--gold-bright);
}

/* 03 服务能力 */
.page-about .about-cap {
  background:
    radial-gradient(circle at 88% 16%, rgba(201, 162, 39, 0.12) 0%, transparent 40%),
    var(--bg-card);
}

.page-about .about-cap__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.page-about .about-stat {
  background: var(--bg-deep);
  border: 1px solid var(--border-fine);
  border-radius: var(--about-card-radius);
  padding: 1.25rem 1rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.page-about .about-stat:hover,
.page-about .about-stat:focus-within {
  transform: translateY(-3px);
  box-shadow: var(--shadow-soft);
  border-color: rgba(201, 162, 39, 0.5);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 6vw, 3.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--gold-bright);
  margin-bottom: 0.5rem;
}

.page-about .about-stat__label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  transition: color 0.15s ease;
}

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

.page-about .about-stat__detail {
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: 0;
}

.page-about .about-cap__detail {
  display: grid;
  gap: 1.5rem;
  margin-top: 2rem;
  align-items: center;
}

.page-about .about-cap__desc h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.page-about .about-cap__desc p {
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 0.9rem;
}

.page-about .about-cap__visual {
  background: var(--bg-deep);
  border: 1px solid var(--border-fine);
  border-radius: var(--about-card-radius);
  padding: 1.5rem;
  max-width: 340px;
  margin: 0 auto;
  width: 100%;
}

.page-about .about-cap__visual svg {
  width: 100%;
  height: auto;
  display: block;
}

.page-about .about-cap__caption {
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin: 0.75rem 0 0;
}

/* 04 质量与内容治理 */
.page-about .about-gov {
  background:
    linear-gradient(180deg, rgba(62, 180, 212, 0.08) 0%, transparent 100%),
    var(--bg-deep);
}

.page-about .about-gov__grid {
  display: grid;
  gap: 2rem;
}

.page-about .about-gov__cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about .about-gov-card {
  background: var(--bg-card);
  border: 1px solid var(--border-fine);
  border-radius: 4px;
  padding: 1.25rem;
  transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}

.page-about .about-gov-card:hover,
.page-about .about-gov-card:focus-within {
  border-color: rgba(62, 180, 212, 0.5);
  transform: translateY(-2px);
  box-shadow: var(--shadow-soft);
}

.page-about .about-gov-card__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 2rem;
  line-height: 1;
  color: var(--cyan);
  margin-bottom: 0.75rem;
}

.page-about .about-gov-card h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  line-height: 1.3;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.page-about .about-gov-card p {
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.65;
  margin-bottom: 0;
}

.page-about .about-gov__visual {
  min-width: 0;
}

.page-about .about-gov__visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--border-fine);
  border-radius: var(--about-card-radius);
}

.page-about .about-gov__bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  margin-top: 2rem;
  padding: 1.25rem 1.5rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-fine);
  border-radius: 4px;
}

.page-about .about-gov__bottom p {
  margin-bottom: 0;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 42rem;
}

/* 05 信任与合规 */
.page-about .about-trust {
  background:
    linear-gradient(160deg, rgba(10, 20, 40, 0.6) 0%, var(--bg-card) 64%, var(--bg-deep) 100%);
}

.page-about .about-trust__grid {
  display: grid;
  gap: 1rem;
}

.page-about .about-trust__item {
  padding: 1.25rem 1.5rem;
  border-top: 1px solid var(--border-fine);
  border-right: 1px solid var(--border-fine);
  border-bottom: 1px solid var(--border-fine);
  border-left: 3px solid var(--gold);
  background: rgba(255, 255, 255, 0.02);
}

.page-about .about-trust__item h3 {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold-bright);
  margin-bottom: 0.6rem;
}

.page-about .about-trust__item p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 0;
}

.page-about .about-trust__item p + p {
  margin-top: 0.4rem;
}

.page-about .about-trust__note {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  margin-top: 2rem;
  padding: 1.5rem;
  border: 1px dashed var(--border-fine);
  background: rgba(10, 20, 40, 0.6);
  border-radius: 4px;
}

.page-about .about-trust__note p {
  flex: 1 1 30rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 0;
}

.page-about .about-trust__note a {
  color: var(--gold-bright);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 平板与桌面布局 */
@media (min-width: 720px) {
  .page-about .about-gov__cards {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (min-width: 900px) {
  .page-about .about-hero,
  .page-about .about-evo,
  .page-about .about-cap,
  .page-about .about-gov,
  .page-about .about-trust {
    padding: 4rem 2.5rem;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 3.5rem;
    align-items: center;
  }

  .page-about .about-hero__visual {
    margin-bottom: 1rem;
  }

  .page-about .about-hero__stamp {
    position: absolute;
    bottom: -0.75rem;
    left: -0.75rem;
    box-shadow: var(--shadow-soft);
    margin-bottom: 0;
  }

  .page-about .about-hero__img {
    margin-bottom: 0;
  }

  .page-about .about-timeline {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    overflow: visible;
    padding: 1.75rem 0 0.25rem;
    scroll-snap-type: none;
  }

  .page-about .about-timeline::before {
    content: "";
    position: absolute;
    top: 0.25rem;
    left: 2rem;
    right: 2rem;
    height: 1px;
    background: linear-gradient(90deg, var(--gold) 0%, var(--cyan) 60%, var(--action) 100%);
    z-index: 0;
  }

  .page-about .about-tl {
    flex: none;
    z-index: 1;
  }

  .page-about .about-cap__stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
  }

  .page-about .about-stat {
    padding: 1.5rem 1.25rem;
  }

  .page-about .about-cap__detail {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 2.5rem;
  }

  .page-about .about-gov__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
    gap: 2.5rem;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero,
  .page-about .about-evo,
  .page-about .about-cap,
  .page-about .about-gov,
  .page-about .about-trust {
    padding: 5rem 3rem;
  }
}