.page-about {
  --about-navy: #0A1F44;
  --about-orange: #FF6B35;
  --about-white: #FFFFFF;
  --about-soft: #F5F7FA;
  --about-blue-soft: #E8F1FF;
  --about-orange-soft: #FFE8DE;
  --about-ink: #333333;
  --about-muted: #666666;
  --about-line: rgba(10, 31, 68, 0.16);
  --about-pill: 999px;
  --about-card-radius: 1.5rem;
  background: var(--about-white);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  padding-top: 1.25rem;
  padding-bottom: 0.5rem;
  font-size: 0.875rem;
}

/* ===== Hero 首屏 ===== */
.page-about .about-hero {
  position: relative;
  background: var(--about-navy);
  color: var(--about-white);
  padding: 3rem 0 5rem;
  overflow: hidden;
  border-radius: 0 0 2.5rem 2.5rem;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: -12%;
  width: 56%;
  height: 100%;
  background: linear-gradient(135deg, transparent 0%, rgba(255, 107, 53, 0.14) 55%, rgba(255, 107, 53, 0.28) 100%);
  transform: skewX(-12deg);
  border-radius: 0 0 0 3rem;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 0.5rem;
  background: var(--about-orange);
  border-radius: var(--about-pill);
  opacity: 0.9;
}

.page-about .about-hero__stamp {
  position: absolute;
  right: 1.5rem;
  bottom: 4rem;
  font-family: var(--font-data);
  font-size: 12rem;
  font-weight: 900;
  line-height: 1;
  color: rgba(255, 255, 255, 0.05);
  letter-spacing: -0.08em;
  user-select: none;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
}

.page-about .about-hero__eyebrow {
  color: var(--about-orange);
  letter-spacing: 0.08em;
  font-weight: 700;
}

.page-about .about-hero__title {
  font-size: clamp(2.1rem, 5vw, 3.6rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0.75rem 0 1.5rem;
  max-width: 25ch;
}

.page-about .about-hero__lead {
  font-size: clamp(0.95rem, 1.4vw, 1.125rem);
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.84);
  max-width: 58ch;
  margin: 0 0 2rem;
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.page-about .about-hero__stat {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.18);
  padding: 0.6rem 1.1rem;
  border-radius: var(--about-pill);
  backdrop-filter: blur(6px);
}

.page-about .about-hero__stat strong {
  font-family: var(--font-data);
  font-size: 1.25rem;
  color: var(--about-orange);
}

.page-about .about-hero__stat span {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.8);
}

.page-about .about-hero__cta {
  display: inline-block;
}

/* ===== 页内目录 ===== */
.page-about .about-toc {
  display: flex;
  flex-wrap: nowrap;
  overflow-x: auto;
  gap: 0.625rem;
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
  scrollbar-width: none;
}

.page-about .about-toc::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc a {
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--about-ink);
  background: var(--about-soft);
  border: 1px solid transparent;
  padding: 0.5rem 1.1rem;
  border-radius: var(--about-pill);
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.page-about .about-toc a:hover {
  background: var(--about-blue-soft);
  border-color: rgba(10, 31, 68, 0.15);
}

/* ===== 品牌DNA ===== */
.page-about .about-dna {
  padding: 4rem 0 4.5rem;
}

.page-about .about-dna__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}

.page-about .about-dna__content .eyebrow {
  color: var(--about-orange);
}

.page-about .about-dna__content h2 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 900;
  margin: 0.5rem 0 1.25rem;
  color: var(--about-navy);
  letter-spacing: -0.02em;
}

.page-about .about-dna__lead {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--about-ink);
  margin-bottom: 1.5rem;
}

.page-about .about-dna__list {
  list-style: none;
  padding: 0;
  margin: 0 0 1.75rem;
  display: grid;
  gap: 0.875rem;
}

.page-about .about-dna__list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  background: var(--about-soft);
  border-radius: var(--about-card-radius);
  padding: 1rem 1.25rem;
  position: relative;
  overflow: hidden;
}

.page-about .about-dna__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--about-orange);
  border-radius: var(--about-pill);
}

.page-about .about-dna__list strong {
  flex-shrink: 0;
  font-family: var(--font-data);
  font-size: 1.15rem;
  color: var(--about-navy);
  min-width: 4.2rem;
}

.page-about .about-dna__list span {
  color: var(--about-muted);
  line-height: 1.6;
  font-size: 0.9375rem;
}

.page-about .about-dna__note {
  font-size: 0.875rem;
  color: var(--about-muted);
  border-left: 4px solid var(--about-blue-soft);
  padding-left: 1rem;
}

.page-about .about-dna__figure {
  margin: 0;
  border-radius: var(--about-card-radius);
  background: var(--about-blue-soft);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transform: rotate(-0.5deg);
}

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

.page-about .about-dna__figure .figure__label {
  background: var(--about-navy);
  color: var(--about-white);
  padding: 0.5rem 1rem;
  text-align: center;
  font-size: 0.8125rem;
}

/* ===== 发展里程碑 ===== */
.page-about .about-milestone {
  background: var(--about-soft);
  padding: 4.5rem 0 3rem;
  overflow: hidden;
}

.page-about .about-milestone__head {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.page-about .about-milestone__head .eyebrow {
  color: var(--about-orange);
}

.page-about .about-milestone__head h2 {
  font-size: clamp(1.75rem, 3vw, 2.4rem);
  font-weight: 900;
  color: var(--about-navy);
  margin: 0;
  letter-spacing: -0.02em;
}

.page-about .about-milestone__hint {
  font-size: 0.8125rem;
  color: var(--about-muted);
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.page-about .about-milestone__hint::before {
  content: "←";
  font-family: var(--font-data);
  color: var(--about-orange);
}

.page-about .about-timeline {
  position: relative;
  padding: 1.5rem 0 2rem;
}

.page-about .about-timeline__track {
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  padding: 0.5rem 1.25rem 1.5rem;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
  scrollbar-color: var(--about-orange) transparent;
}

.page-about .about-timeline__track::before {
  content: "";
  position: absolute;
  top: 3.1rem;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, rgba(10, 31, 68, 0.04) 0%, rgba(10, 31, 68, 0.55) 50%, rgba(10, 31, 68, 0.04) 100%);
  border-radius: var(--about-pill);
  pointer-events: none;
}

.page-about .about-timeline__item {
  flex: 0 0 min(84vw, 300px);
  scroll-snap-align: start;
  position: relative;
}

.page-about .about-timeline__year {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.4rem 1.1rem;
  background: var(--about-navy);
  color: var(--about-white);
  border-radius: var(--about-pill);
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: 0.02em;
  box-shadow: 0 8px 18px rgba(10, 31, 68, 0.18);
  position: relative;
  z-index: 2;
  margin-bottom: 1rem;
}

.page-about .about-timeline__year::after {
  content: "";
  position: absolute;
  right: -0.5rem;
  width: 0.5rem;
  height: 0.375rem;
  background: var(--about-orange);
  border-radius: var(--about-pill);
}

.page-about .about-timeline__card {
  background: var(--about-white);
  border-radius: var(--about-card-radius);
  padding: 1.4rem;
  box-shadow: var(--shadow-card);
  border-top: 5px solid var(--about-orange);
  transition: transform 0.2s ease;
}

.page-about .about-timeline__item:nth-child(3n + 2) .about-timeline__card {
  border-top-color: var(--about-navy);
}

.page-about .about-timeline__item:nth-child(3n) .about-timeline__card {
  border-top-color: var(--about-blue-soft);
}

.page-about .about-timeline__card .tag {
  margin-bottom: 0.75rem;
}

.page-about .about-timeline__card h3 {
  font-size: 1.125rem;
  font-weight: 900;
  color: var(--about-ink);
  margin: 0 0 0.5rem;
}

.page-about .about-timeline__card p {
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--about-muted);
  margin: 0;
}

/* ===== 技术演进 ===== */
.page-about .about-tech {
  background: linear-gradient(140deg, var(--about-navy) 0%, #132a52 60%, #1b3560 100%);
  color: var(--about-white);
  padding: 4.5rem 0 4.5rem;
  position: relative;
  overflow: hidden;
}

.page-about .about-tech::before {
  content: "";
  position: absolute;
  top: -12rem;
  left: -10rem;
  width: 30rem;
  height: 30rem;
  background: radial-gradient(circle, rgba(255, 107, 53, 0.12) 0%, transparent 70%);
}

.page-about .about-tech__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
  position: relative;
  z-index: 2;
}

.page-about .about-tech__figure {
  margin: 0;
  border-radius: var(--about-card-radius);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.06);
}

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

.page-about .about-tech__figure .figure__label {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.8125rem;
  padding: 0.6rem 1rem;
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.page-about .about-tech__content .eyebrow {
  color: var(--about-orange);
}

.page-about .about-tech__content h2 {
  font-size: clamp(1.75rem, 3vw, 2.4rem);
  font-weight: 900;
  margin: 0.5rem 0 1rem;
  color: var(--about-white);
  letter-spacing: -0.02em;
}

.page-about .about-tech__lead {
  color: rgba(255, 255, 255, 0.78);
  line-height: 1.8;
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

.page-about .about-tech__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.875rem;
}

.page-about .about-tech__list li {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 1.25rem;
  padding: 1.1rem 1.3rem;
  display: grid;
  gap: 0.3rem;
}

.page-about .about-tech__list strong {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1rem;
  font-weight: 900;
  color: var(--about-white);
}

.page-about .about-tech__list strong::before {
  content: "";
  width: 0.625rem;
  height: 0.625rem;
  border-radius: 50%;
  background: var(--about-orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.25);
  flex-shrink: 0;
}

.page-about .about-tech__list span {
  font-size: 0.875rem;
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.68);
}

/* ===== 2024改版详情 ===== */
.page-about .about-update {
  padding: 4.5rem 0 5rem;
  background: var(--about-white);
}

.page-about .about-update__head {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.page-about .about-update__head .eyebrow {
  color: var(--about-orange);
}

.page-about .about-update__head h2 {
  font-size: clamp(1.75rem, 3vw, 2.4rem);
  font-weight: 900;
  color: var(--about-navy);
  margin: 0;
  letter-spacing: -0.02em;
}

.page-about .about-update__intro {
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--about-muted);
  max-width: 62ch;
  margin: 0;
}

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

.page-about .about-update__item {
  background: var(--about-soft);
  border-radius: var(--about-card-radius);
  border: 1px solid transparent;
  border-left: 5px solid var(--about-orange);
  overflow: hidden;
  transition: background 0.2s ease;
}

.page-about .about-update__item[open] {
  background: var(--about-blue-soft);
}

.page-about .about-update__item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem 1.25rem 1.25rem 1.5rem;
}

.page-about .about-update__item summary::-webkit-details-marker {
  display: none;
}

.page-about .about-update__item summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-data);
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--about-navy);
  line-height: 1;
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.page-about .about-update__item[open] summary::after {
  content: "−";
  transform: rotate(180deg);
}

.page-about .about-update__num {
  font-family: var(--font-data);
  font-size: 1.5rem;
  font-weight: 900;
  line-height: 1;
  color: var(--about-orange);
  flex-shrink: 0;
  width: 2.2rem;
}

.page-about .about-update__title {
  font-size: 1rem;
  font-weight: 900;
  color: var(--about-ink);
  line-height: 1.4;
  padding-top: 0.15rem;
}

.page-about .about-update__body {
  padding: 0 1.5rem 1.4rem 3.7rem;
}

.page-about .about-update__body p {
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--about-ink);
  margin: 0 0 0.75rem;
}

.page-about .about-update__meta {
  display: inline-flex;
  align-items: center;
  background: var(--about-orange-soft);
  color: var(--about-orange);
  font-weight: 700;
  font-size: 0.8125rem;
  padding: 0.4rem 0.9rem;
  border-radius: var(--about-pill);
  margin-top: 0.25rem;
}

/* ===== 实力与认证 ===== */
.page-about .about-proof {
  background: var(--about-navy);
  color: var(--about-white);
  padding: 4.5rem 0 4.5rem;
  position: relative;
  overflow: hidden;
  border-radius: 2.5rem 2.5rem 0 0;
}

.page-about .about-proof::after {
  content: "DATA";
  position: absolute;
  right: -1rem;
  bottom: 1rem;
  font-family: var(--font-data);
  font-weight: 900;
  font-size: clamp(6rem, 18vw, 14rem);
  line-height: 1;
  letter-spacing: -0.06em;
  color: rgba(255, 255, 255, 0.04);
  pointer-events: none;
  user-select: none;
}

.page-about .about-proof__head {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: flex-start;
  margin-bottom: 2.5rem;
  position: relative;
  z-index: 2;
}

.page-about .about-proof__head .eyebrow {
  color: var(--about-orange);
}

.page-about .about-proof__head h2 {
  font-size: clamp(1.75rem, 3vw, 2.4rem);
  font-weight: 900;
  margin: 0;
  color: var(--about-white);
  letter-spacing: -0.02em;
}

.page-about .about-proof__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: stretch;
  position: relative;
  z-index: 2;
}

.page-about .stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.875rem;
}

.page-about .stat-card--invert {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--about-card-radius);
  padding: 1.4rem 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: background 0.2s ease, transform 0.2s ease;
}

.page-about .stat-card--invert:hover {
  background: rgba(255, 255, 255, 0.12);
  transform: translateY(-2px);
}

.page-about .stat-card__num {
  font-family: var(--font-data);
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 900;
  line-height: 1.1;
  color: var(--about-orange);
}

.page-about .stat-card__label {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.65);
}

.page-about .about-proof__figure {
  margin: 0;
  border-radius: var(--about-card-radius);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.05);
  align-self: stretch;
}

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

.page-about .about-proof__figure .figure__label {
  padding: 0.6rem 1rem;
  text-align: center;
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.7);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.page-about .about-proof__note {
  margin: 2rem 0 0;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.8;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 1.25rem;
  padding: 1.1rem 1.4rem;
  position: relative;
  z-index: 2;
}

/* ===== 继续了解 ===== */
.page-about .about-more {
  background: var(--about-orange-soft);
  padding: 4rem 0 4.5rem;
}

.page-about .about-more__inner {
  display: grid;
  gap: 1rem;
  justify-items: start;
}

.page-about .about-more__inner h2 {
  font-size: clamp(1.5rem, 2.6vw, 2.2rem);
  font-weight: 900;
  color: var(--about-navy);
  margin: 0;
  letter-spacing: -0.02em;
}

.page-about .about-more__inner p {
  font-size: 0.9375rem;
  color: var(--about-muted);
  margin: 0;
}

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

.page-about .about-more__links .btn {
  white-space: nowrap;
}

/* ===== 响应式规则：桌面端 ===== */
@media (min-width: 48rem) {
  .page-about .about-hero {
    padding: 5.5rem 0 7rem;
    border-radius: 0 0 4rem 4rem;
  }

  .page-about .about-hero__title {
    font-size: 3.5rem;
  }

  .page-about .about-hero__stamp {
    font-size: 20rem;
    right: 4rem;
    bottom: 2.5rem;
  }

  .page-about .about-toc {
    padding-top: 2rem;
    padding-bottom: 2rem;
    justify-content: center;
  }

  .page-about .about-dna__grid {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
  }

  .page-about .about-dna__figure {
    transform: rotate(1.2deg);
  }

  .page-about .about-dna__content h2 {
    font-size: 2.5rem;
  }

  .page-about .about-milestone__head {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }

  .page-about .about-milestone__hint {
    font-size: 0.875rem;
  }

  .page-about .about-timeline__track {
    gap: 1.5rem;
    padding-left: calc((100vw - 75rem) / 2 + 2rem);
    padding-right: 2rem;
  }

  .page-about .about-timeline__item {
    flex: 0 0 320px;
  }

  .page-about .about-tech__grid {
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
  }

  .page-about .about-update__head {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-end;
  }

  .page-about .about-update__intro {
    max-width: 42ch;
  }

  .page-about .about-update__list {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .page-about .about-update__body {
    padding-left: 4rem;
  }

  .page-about .about-proof__head {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-end;
  }

  .page-about .about-proof__grid {
    grid-template-columns: 1fr 0.9fr;
    gap: 2.5rem;
  }

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

  .page-about .about-more__inner {
    justify-items: center;
    text-align: center;
  }
}