.page-about {
  --about-line: linear-gradient(180deg, var(--color-purple) 0%, var(--color-deep) 55%, var(--color-neon) 100%);
  --about-hero-bg: linear-gradient(135deg, rgba(26, 42, 110, 0.07), rgba(106, 13, 173, 0.08) 50%, rgba(198, 246, 48, 0.12));
  position: relative;
  background-color: var(--color-cream);
  overflow-x: hidden;
  color: var(--color-ink);
}

/* ============ 面包屑 ============ */
.page-about .crumb {
  padding-top: 1.25rem;
  margin-bottom: 0.5rem;
  font-family: var(--font-data);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
}
.page-about .crumb__link {
  color: var(--color-deep);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}
.page-about .crumb__link:hover {
  color: var(--color-accent);
}
.page-about .crumb__sep {
  margin: 0 0.5rem;
  color: var(--color-accent);
  font-weight: 700;
}
.page-about .crumb__current {
  color: var(--color-ink);
  font-weight: 600;
  opacity: 0.72;
}

/* ============ 首屏 Hero ============ */
.page-about .about-hero {
  position: relative;
  display: grid;
  gap: 2rem;
  padding: 1.75rem 1rem 2.5rem;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--about-hero-bg);
  clip-path: polygon(0 0, 100% 0, 100% 48%, 70% 72%, 0 100%);
  z-index: 0;
  pointer-events: none;
}
.page-about .about-hero > * {
  position: relative;
  z-index: 1;
}
.page-about .about-hero__text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
}
.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 2.25rem;
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin: 0.75rem 0 1.25rem;
  color: var(--color-ink);
}
.page-about .about-hero__title-accent {
  display: block;
  color: var(--color-deep);
  position: relative;
}
.page-about .about-hero__title-accent::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0.1em;
  width: 100%;
  height: 0.24em;
  background: linear-gradient(90deg, var(--color-accent), var(--color-purple));
  z-index: -1;
  opacity: 0.22;
  border-radius: 2px;
}
.page-about .about-hero__lead {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.8;
  max-width: 540px;
  margin: 0 0 1.5rem;
  color: rgba(45, 31, 20, 0.86);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.page-about .about-hero__media {
  max-width: 600px;
}

/* ============ 双层布局 ============ */
.page-about .about-layout {
  display: grid;
  gap: 2.5rem;
  padding: 0 1rem 4rem;
}
.page-about .about-main {
  min-width: 0;
}

/* ============ 左侧章节目录 ============ */
.page-about .about-aside {
  display: block;
}
.page-about .chapter-nav__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin: 0 0 0.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(45, 31, 20, 0.14);
}
.page-about .chapter-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding-bottom: 0.5rem;
  margin-bottom: 0.75rem;
}
.page-about .chapter-nav__list::-webkit-scrollbar {
  display: none;
}
.page-about .chapter-nav__item {
  flex: 0 0 auto;
}
.page-about .chapter-nav__link {
  display: inline-block;
  padding: 0.375rem 0.875rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid rgba(45, 31, 20, 0.08);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-ink);
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease);
}
.page-about .chapter-nav__link:hover,
.page-about .chapter-nav__link[aria-current="location"] {
  background: var(--color-deep);
  border-color: var(--color-deep);
  color: var(--color-cream);
}
.page-about .about-aside__note {
  display: none;
  border-radius: var(--radius-sm);
  padding: 1rem 1.125rem;
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(6px);
  border: 1px solid rgba(45, 31, 20, 0.08);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: rgba(45, 31, 20, 0.82);
}
.page-about .about-aside__note p {
  margin: 0;
}
.page-about .about-aside__note::before {
  content: "· 亮点";
  display: block;
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin-bottom: 0.3rem;
}

/* ============ 章节通用 ============ */
.page-about .about-section {
  margin-bottom: 3.5rem;
}
.page-about .about-section > h2 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.75rem;
  line-height: 1.3;
  letter-spacing: -0.015em;
  margin: 0.5rem 0 1.25rem;
  color: var(--color-ink);
}
.page-about .about-section__lead {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.75;
  max-width: 640px;
  color: rgba(45, 31, 20, 0.82);
  margin: 0.25rem 0 1.25rem;
}

/* ============ 品牌介绍 ============ */
.page-about .about-intro__prose p {
  font-size: 1.0625rem;
  line-height: 1.8;
  margin: 0 0 1.1em;
  color: rgba(45, 31, 20, 0.9);
}
.page-about .about-intro__prose p:first-child::first-letter {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 3.4em;
  line-height: 0.85;
  color: var(--color-accent);
  float: left;
  padding: 0.08em 0.12em 0 0;
}
.page-about .about-quote {
  position: relative;
  margin: 2rem 0 0;
  padding: 1.5rem 1.75rem;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(45, 31, 20, 0.08);
  box-shadow: var(--shadow-1);
}
.page-about .about-quote::before {
  content: "“";
  position: absolute;
  top: -1.2rem;
  left: 0.75rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 4.5rem;
  line-height: 1;
  color: var(--color-accent);
  opacity: 0.32;
}
.page-about .about-quote p {
  font-family: var(--font-body);
  font-size: 1.125rem;
  line-height: 1.75;
  margin: 0;
  color: var(--color-ink);
  font-style: italic;
}

/* ============ 发展历程时间轴 ============ */
.page-about .about-timeline {
  margin-top: 1.5rem;
}
.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-timeline__item {
  position: relative;
  padding-left: 48px;
  padding-bottom: 1.75rem;
}
.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 10px;
  bottom: -4px;
  width: 2px;
  background: var(--about-line);
  opacity: 0.5;
}
.page-about .about-timeline__item:last-child::before {
  display: none;
}
.page-about .about-timeline__item::after {
  content: "";
  position: absolute;
  left: 8px;
  top: 14px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-cream), 0 0 0 7px rgba(232, 93, 47, 0.24);
}
.page-about .about-timeline__year {
  margin-bottom: 0.625rem;
}
.page-about .about-timeline__year-num {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.04em;
  padding: 0.4rem 0.85rem;
  background: var(--color-ink);
  color: var(--color-neon);
  border-radius: 999px;
  transform: rotate(-1deg);
  box-shadow: 0 3px 0 rgba(45, 31, 20, 0.22);
}
.page-about .about-timeline__card {
  background: var(--color-white);
  border: 1px solid rgba(45, 31, 20, 0.08);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.25rem 1rem;
  box-shadow: var(--shadow-1);
  transform: rotate(0.4deg);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.page-about .about-timeline__card:hover {
  transform: rotate(0deg) translateY(-3px);
  box-shadow: var(--shadow-2);
}
.page-about .about-timeline__card h3 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.125rem;
  margin: 0 0 0.5rem;
  color: var(--color-ink);
}
.page-about .about-timeline__card h3::before {
  content: "◆ ";
  color: var(--color-deep);
  font-size: 0.8em;
}
.page-about .about-timeline__card p {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.72;
  margin: 0;
  color: rgba(45, 31, 20, 0.84);
}

/* ============ 平台数据能力 ============ */
.page-about .about-data {
  display: grid;
  gap: 1.5rem;
  margin-top: 1.25rem;
}
.page-about .about-data__cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
.page-about .about-data__card {
  position: relative;
  border-radius: var(--radius);
  padding: 1.25rem 1.25rem 1.1rem;
  min-height: 130px;
  overflow: hidden;
  box-shadow: var(--shadow-1);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.page-about .about-data__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-2);
}
.page-about .about-data__card--deep {
  background: linear-gradient(135deg, var(--color-deep) 0%, #101A40 80%);
  color: var(--color-cream);
}
.page-about .about-data__card--deep::after {
  content: "";
  position: absolute;
  right: -24px;
  bottom: -36px;
  width: 110px;
  height: 110px;
  border-radius: 50%;
  background: var(--color-purple);
  opacity: 0.4;
}
.page-about .about-data__card--accent {
  background: var(--color-accent);
  color: var(--color-ink);
}
.page-about .about-data__card--neon {
  background: var(--color-neon);
  color: var(--color-ink);
}
.page-about .about-data__card--ink {
  background: var(--color-ink);
  color: var(--color-cream);
}
.page-about .about-data__card--glass {
  background: rgba(255, 255, 255, 0.62);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.8);
  color: var(--color-ink);
}
.page-about .about-data__card .stat__label {
  font-family: var(--font-data);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.82;
  margin: 0 0 0.4rem;
}
.page-about .about-data__card .stat__num {
  font-family: var(--font-data);
  font-size: 2.4rem;
  font-weight: 700;
  line-height: 1.1;
  margin: 0 0 0.5rem;
}
.page-about .about-data__card--deep .stat__num {
  color: var(--color-accent);
}
.page-about .about-data__card--ink .stat__num {
  color: var(--color-neon);
}
.page-about .about-data__desc {
  font-family: var(--font-body);
  font-size: 0.875rem;
  line-height: 1.6;
  margin: 0;
  max-width: 230px;
  position: relative;
  z-index: 1;
  opacity: 0.88;
}

/* ============ 资质认证与团队 ============ */
.page-about .about-team {
  display: grid;
  gap: 2rem;
  margin-top: 1rem;
}
.page-about .about-team__certs {
  display: grid;
  gap: 1rem;
}
.page-about .about-team__cert {
  border-radius: var(--radius);
  padding: 1.5rem 1.5rem 1.25rem;
  background: rgba(255, 255, 255, 0.62);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(45, 31, 20, 0.08);
  box-shadow: var(--shadow-1);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.page-about .about-team__cert:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
}
.page-about .about-team__cert-title {
  font-family: var(--font-data);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-accent);
  margin: 0 0 0.25rem;
}
.page-about .about-team__cert h3 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.0625rem;
  margin: 0 0 0.5rem;
  color: var(--color-ink);
}
.page-about .about-team__cert p {
  font-family: var(--font-body);
  font-size: 0.9rem;
  line-height: 1.68;
  margin: 0;
  color: rgba(45, 31, 20, 0.82);
}
.page-about .about-team__card {
  display: grid;
  gap: 1.25rem;
}
.page-about .about-team__desc {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.78;
  color: rgba(45, 31, 20, 0.88);
  max-width: 680px;
}
.page-about .about-team__desc p {
  margin: 0;
}

/* ============ 合作生态 ============ */
.page-about .about-partners {
  display: grid;
  gap: 1rem;
  margin-top: 1.25rem;
}
.page-about .about-partners__card {
  border-radius: var(--radius);
  padding: 1.5rem 1.5rem 1.25rem;
  background: rgba(255, 255, 255, 0.62);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(45, 31, 20, 0.08);
  box-shadow: var(--shadow-1);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.page-about .about-partners__card:hover {
  transform: translateY(-3px) rotate(-0.3deg);
  box-shadow: var(--shadow-2);
}
.page-about .about-partners__card h3 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.125rem;
  margin: 0 0 0.75rem;
  color: var(--color-deep);
}
.page-about .about-partners__card h3::before {
  content: "◆ ";
  color: var(--color-accent);
}
.page-about .about-partners__card p {
  font-family: var(--font-body);
  font-size: 0.925rem;
  line-height: 1.75;
  margin: 0;
  color: rgba(45, 31, 20, 0.84);
}
.page-about .about-partners__note {
  margin-top: 1.5rem;
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--color-cream);
}

/* ============ 底部 CTA 门户 ============ */
.page-about .about-portal {
  margin-top: 3.5rem;
  padding: 2.75rem 1.5rem;
  border-radius: 20px;
  background: linear-gradient(135deg, rgba(106, 13, 173, 0.13), rgba(26, 42, 110, 0.16) 55%, rgba(198, 246, 48, 0.22));
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-about .about-portal::before {
  content: "";
  position: absolute;
  top: -40px;
  right: -40px;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: var(--color-purple);
  opacity: 0.14;
  pointer-events: none;
}
.page-about .about-portal::after {
  content: "";
  position: absolute;
  bottom: -20px;
  left: 12%;
  width: 78%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-purple), var(--color-deep), var(--color-neon));
  border-radius: 3px;
  pointer-events: none;
}
.page-about .about-portal h2 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.75rem;
  margin: 0 0 0.75rem;
  color: var(--color-ink);
}
.page-about .about-portal p {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  margin: 0 auto 1.75rem;
  max-width: 520px;
  color: rgba(45, 31, 20, 0.84);
}
.page-about .about-portal__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

/* ============ 断点：平板 ============ */
@media (min-width: 620px) {
  .page-about .about-data__cards {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .about-data__card--lg {
    grid-column: 1 / -1;
  }
  .page-about .about-data__card--team {
    grid-column: 1 / -1;
  }
  .page-about .about-team__certs {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .about-partners {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .about-partners__card:last-child {
    grid-column: 1 / -1;
  }
  .page-about .about-team__card {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }
}

/* ============ 断点：桌面窄 ============ */
@media (min-width: 860px) {
  .page-about .about-hero {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
    gap: 3rem;
    padding: 2.5rem 1rem 4rem;
  }
  .page-about .about-hero h1 {
    font-size: 3rem;
  }
  .page-about .about-hero__media {
    margin-left: auto;
  }
  .page-about .about-partners {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .about-partners__card:last-child {
    grid-column: auto;
  }
}

/* ============ 断点：桌面 ============ */
@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 3.5rem;
    align-items: start;
    max-width: 1200px;
  }
  .page-about .about-aside {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }
  .page-about .chapter-nav__list {
    display: block;
    overflow: visible;
    margin-bottom: 1.25rem;
  }
  .page-about .chapter-nav__item {
    margin-bottom: 0.375rem;
  }
  .page-about .chapter-nav__link {
    display: block;
    border-radius: 8px;
    padding: 0.5rem 0.875rem;
    white-space: normal;
    border-color: transparent;
    background: transparent;
  }
  .page-about .chapter-nav__link:hover {
    background: var(--color-deep);
    border-color: var(--color-deep);
    color: var(--color-cream);
  }
  .page-about .about-aside__note {
    display: block;
  }
  .page-about .about-section > h2 {
    font-size: 2rem;
  }
  .page-about .about-data {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

/* ============ 断点：超宽 ============ */
@media (min-width: 1200px) {
  .page-about .about-hero {
    padding-left: 0;
    padding-right: 0;
  }
}