.page-about {
  --about-cut: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
  --about-dim-white: rgba(255, 255, 255, 0.72);
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ===== 面包屑（深色英雄区内） ===== */
.page-about .breadcrumbs {
  padding: 18px 0 0;
}
.page-about .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .breadcrumbs__link {
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.25s var(--ease);
}
.page-about .breadcrumbs__link:hover {
  color: var(--color-accent);
}
.page-about .breadcrumbs__item--current {
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.875rem;
}

/* ===== Hero ===== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--color-primary);
  color: var(--color-text-light);
  padding-bottom: 56px;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1.5px 1.5px at 18% 22%, rgba(255, 255, 255, 0.35), transparent),
    radial-gradient(1px 1px at 82% 16%, rgba(255, 255, 255, 0.26), transparent),
    radial-gradient(1.5px 1.5px at 66% 74%, rgba(255, 255, 255, 0.18), transparent),
    radial-gradient(1px 1px at 34% 84%, rgba(255, 255, 255, 0.22), transparent),
    radial-gradient(1px 1px at 50% 40%, rgba(255, 255, 255, 0.1), transparent);
  pointer-events: none;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -80px;
  width: 260px;
  height: 260px;
  background: var(--color-accent-2);
  opacity: 0.14;
  transform: rotate(18deg);
  clip-path: polygon(0 0, 100% 0, 100% 74%, 18% 100%);
  pointer-events: none;
}
.page-about .about-hero__layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  padding-top: 28px;
}
.page-about .about-hero__eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  border-left: 3px solid var(--color-accent);
  padding-left: 12px;
  margin: 0 0 20px;
}
.page-about .about-hero__content h1 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(1.75rem, 5.6vw, 3.25rem);
  line-height: 1.12;
  margin: 0 0 18px;
}
.page-about .about-hero__lead {
  max-width: 520px;
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--about-dim-white);
  margin: 0;
}
.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 36px;
  max-width: 600px;
}
.page-about .about-hero__stat {
  border-left: 2px solid var(--color-accent);
  padding-left: 12px;
}
.page-about .about-hero__num,
.page-about .about-hero__desc {
  display: block;
}
.page-about .about-hero__num {
  font-family: var(--font-heading);
  font-size: clamp(1.125rem, 2.8vw, 1.625rem);
  line-height: 1.2;
  color: var(--color-text-light);
}
.page-about .about-hero__desc {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.55);
  margin-top: 2px;
}
.page-about .about-hero__figure {
  margin: 0;
}
.page-about .about-hero__img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
}

/* ===== 章节头 ===== */
.page-about .about-section-head {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 40px;
}
.page-about .about-section-head__index {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1;
  color: var(--color-accent);
  transform: rotate(-8deg);
  display: block;
  min-width: 56px;
}
.page-about .about-section-head__kicker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent-2);
  margin: 0 0 4px;
}
.page-about .about-section-head__title {
  font-family: var(--font-heading);
  font-size: clamp(1.375rem, 3.4vw, 2.125rem);
  line-height: 1.2;
  margin: 0;
  color: var(--color-primary);
}
.page-about .about-section-head--dark .about-section-head__title {
  color: var(--color-text-light);
}
.page-about .about-section-head--dark .about-section-head__kicker {
  color: var(--color-accent);
}
.page-about .about-section-head--dark .about-section-head__index {
  color: var(--color-accent-2);
}

/* ===== 品牌理念 ===== */
.page-about .about-philosophy {
  position: relative;
  padding: 64px 0;
  background: var(--color-bg);
}
.page-about .about-philosophy::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 42vw;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-2));
  clip-path: polygon(0 0, 100% 0, calc(100% - 18px) 100%, 0 100%);
}
.page-about .about-philosophy__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}
.page-about .about-philosophy__slogan {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3.8vw, 2.375rem);
  line-height: 1.35;
  color: var(--color-primary);
  margin: 0;
}
.page-about .about-philosophy__slogan .heading-highlight {
  color: var(--color-accent);
}
.page-about .about-philosophy__principles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.page-about .about-principle {
  position: relative;
  padding: 22px 20px 20px 56px;
  background: var(--color-text-light);
  border: 1px solid var(--color-panel);
  border-radius: 0 var(--radius) var(--radius) var(--radius);
  transition: box-shadow 0.3s var(--ease), transform 0.3s var(--ease);
}
.page-about .about-principle:hover {
  box-shadow: 0 10px 24px rgba(11, 27, 63, 0.08);
  transform: translateX(4px);
}
.page-about .about-principle__num {
  position: absolute;
  top: 20px;
  left: 18px;
  font-family: var(--font-heading);
  font-size: 1.375rem;
  color: var(--color-accent);
  transform: rotate(-10deg);
}
.page-about .about-principle__title {
  font-family: var(--font-heading);
  font-size: 1.0625rem;
  margin: 0 0 6px;
  color: var(--color-primary);
}
.page-about .about-principle__text {
  font-size: 0.9375rem;
  color: var(--color-text);
  opacity: 0.78;
  margin: 0;
  line-height: 1.65;
}

/* ===== 发展里程碑 ===== */
.page-about .about-milestones {
  position: relative;
  padding: 64px 0;
  overflow: hidden;
  background: var(--color-primary);
  color: var(--color-text-light);
}
.page-about .about-milestones::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1.5px 1.5px at 22% 30%, rgba(255, 255, 255, 0.28), transparent),
    radial-gradient(1px 1px at 78% 14%, rgba(255, 255, 255, 0.2), transparent),
    radial-gradient(1.5px 1.5px at 62% 72%, rgba(255, 255, 255, 0.14), transparent),
    radial-gradient(1px 1px at 36% 86%, rgba(255, 255, 255, 0.22), transparent),
    radial-gradient(1px 1px at 90% 48%, rgba(255, 255, 255, 0.12), transparent);
  pointer-events: none;
}
.page-about .about-milestones__figure {
  position: relative;
  margin: 0 0 48px;
}
.page-about .about-milestones__figure img {
  width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border-radius: var(--radius);
  clip-path: var(--about-cut);
  opacity: 0.92;
}
.page-about .about-timeline {
  position: relative;
  max-width: 740px;
  margin: 0 auto;
  padding-left: 64px;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 16px;
  bottom: 16px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-accent), var(--color-accent-2) 55%, rgba(255, 255, 255, 0.18));
}
.page-about .about-timeline__item {
  position: relative;
  margin-bottom: 22px;
}
.page-about .about-timeline__summary {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 10px;
  list-style: none;
  cursor: pointer;
  padding: 16px 18px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  transition: background 0.3s var(--ease), transform 0.3s var(--ease);
}
.page-about .about-timeline__summary::-webkit-details-marker {
  display: none;
}
.page-about .about-timeline__summary:hover {
  background: rgba(255, 255, 255, 0.12);
  transform: translateX(2px);
}
.page-about .about-timeline__node {
  position: absolute;
  left: -64px;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-text-light);
  background: var(--color-accent);
  clip-path: polygon(50% 0, 100% 25%, 100% 75%, 50% 100%, 0 75%, 0 25%);
  z-index: 1;
}
.page-about .about-timeline__title {
  font-family: var(--font-heading);
  font-size: 1rem;
  color: var(--color-text-light);
  display: block;
}
.page-about .about-timeline__cue {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.5);
  padding-right: 18px;
  position: relative;
  white-space: nowrap;
}
.page-about .about-timeline__cue::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1rem;
  line-height: 1;
  color: var(--color-accent);
}
.page-about .about-timeline__item[open] .about-timeline__cue::after {
  content: "−";
}
.page-about .about-timeline__detail {
  padding: 14px 18px 16px 24px;
  color: var(--about-dim-white);
  font-size: 0.9375rem;
  line-height: 1.7;
  border-left: 1px solid var(--color-accent-2);
  border-radius: 0 0 var(--radius) var(--radius);
}
.page-about .about-timeline__detail p {
  margin: 0;
}

/* ===== 团队与技术 ===== */
.page-about .about-team {
  padding: 64px 0;
  background: var(--color-bg);
}
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}
.page-about .about-team__lead {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-primary);
  font-weight: 600;
  margin: 0;
}
.page-about .about-team__list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .about-team__list-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  background: var(--color-text-light);
  border: 1px solid var(--color-panel);
  border-left: 3px solid var(--color-accent-2);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.9375rem;
  color: var(--color-text);
}
.page-about .about-team__list-item strong {
  color: var(--color-primary);
}
.page-about .about-team__list-icon {
  color: var(--color-accent-2);
  font-size: 1.125rem;
  line-height: 1.4;
}
.page-about .about-team__visual {
  display: grid;
  justify-items: center;
  gap: 28px;
}
.page-about .about-team__chart-wrap {
  margin: 0;
  width: 100%;
  max-width: 480px;
}
.page-about .about-team__chart-wrap img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius);
  clip-path: var(--about-cut);
}
.page-about .about-team__donut {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: conic-gradient(var(--color-accent) 0 60%, var(--color-panel) 60% 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: transform 0.3s var(--ease);
}
.page-about .about-team__donut:hover {
  transform: scale(1.04);
}
.page-about .about-team__donut::after {
  content: "";
  position: absolute;
  width: 132px;
  height: 132px;
  border-radius: 50%;
  background: var(--color-bg);
}
.page-about .about-team__donut-inner {
  position: relative;
  z-index: 1;
  text-align: center;
}
.page-about .about-team__donut-num {
  display: block;
  font-family: var(--font-heading);
  font-size: 2rem;
  line-height: 1.1;
  color: var(--color-primary);
}
.page-about .about-team__donut-label {
  display: block;
  font-size: 0.75rem;
  color: var(--color-text);
  opacity: 0.7;
}
.page-about .about-team__platforms {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}
.page-about .about-team__platform {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 16px;
  background: var(--color-text-light);
  border: 1px solid var(--color-panel);
  color: var(--color-primary);
  clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}
.page-about .about-team__note {
  font-size: 0.875rem;
  color: var(--color-text);
  opacity: 0.7;
  text-align: center;
  max-width: 400px;
  margin: 0;
}

/* ===== 资质与认证 ===== */
.page-about .about-credentials {
  position: relative;
  padding: 64px 0;
  overflow: hidden;
  background: var(--color-primary);
  color: var(--color-text-light);
}
.page-about .about-credentials::after {
  content: "";
  position: absolute;
  left: -60px;
  top: 40%;
  width: 200px;
  height: 200px;
  background: var(--color-accent);
  opacity: 0.08;
  transform: rotate(24deg);
  clip-path: polygon(0 0, 100% 0, 100% 72%, 0 100%);
  pointer-events: none;
}
.page-about .about-credentials__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
.page-about .about-credential {
  padding: 30px 24px 24px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
  transition: background 0.3s var(--ease), transform 0.3s var(--ease);
}
.page-about .about-credential:hover {
  background: rgba(255, 255, 255, 0.11);
  transform: translateY(-4px);
}
.page-about .about-credential__mark {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 5px 12px;
  background: var(--color-accent);
  color: var(--color-text-light);
  transform: rotate(-2deg);
  margin-bottom: 16px;
}
.page-about .about-credential__title {
  font-family: var(--font-heading);
  font-size: 1.1875rem;
  margin: 0 0 8px;
}
.page-about .about-credential__text {
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.7);
  margin: 0;
  line-height: 1.65;
}

/* ===== 服务承诺 ===== */
.page-about .about-commitment {
  position: relative;
  padding: 56px 0;
  overflow: hidden;
  background: var(--color-secondary);
  color: var(--color-text-light);
}
.page-about .about-commitment::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 260px;
  height: 100%;
  background: linear-gradient(135deg, transparent 55%, var(--color-accent-2) 55%);
  opacity: 0.3;
  pointer-events: none;
}
.page-about .about-commitment__inner {
  position: relative;
  z-index: 1;
  text-align: center;
}
.page-about .about-commitment__trust {
  font-family: var(--font-heading);
  font-size: clamp(1.125rem, 3vw, 1.5rem);
  line-height: 1.55;
  max-width: 660px;
  margin: 0 auto 32px;
}
.page-about .about-commitment__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}
.page-about .about-commitment__contact {
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.7);
  margin: 24px 0 0;
}
.page-about .about-commitment__contact a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* ===== 滚动显现 ===== */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.page-about [data-reveal][data-revealed] {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Tablet ===== */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    gap: 24px;
  }
  .page-about .about-philosophy__principles {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .about-credentials__grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .about-team__visual {
    grid-template-columns: auto auto;
    justify-content: center;
    align-items: center;
    gap: 24px 32px;
  }
  .page-about .about-team__chart-wrap {
    grid-column: 1 / -1;
    max-width: 640px;
  }
  .page-about .about-team__donut {
    grid-column: 1;
  }
  .page-about .about-team__platforms {
    grid-column: 2;
  }
  .page-about .about-team__note {
    grid-column: 1 / -1;
  }
}

/* ===== Desktop ===== */
@media (min-width: 960px) {
  .page-about .about-hero {
    padding-bottom: 72px;
  }
  .page-about .about-hero__layout {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
    gap: 64px;
    padding-top: 44px;
  }
  .page-about .about-hero__img {
    aspect-ratio: 16 / 10;
    max-height: 460px;
  }
  .page-about .about-philosophy__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 64px;
  }
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 64px;
    align-items: center;
  }
  .page-about .about-team__visual {
    grid-template-columns: 1fr;
    justify-items: center;
  }
  .page-about .about-team__chart-wrap {
    grid-column: auto;
  }
  .page-about .about-team__donut {
    grid-column: auto;
  }
  .page-about .about-team__platforms {
    grid-column: auto;
  }
  .page-about .about-team__note {
    grid-column: auto;
  }
  .page-about .about-commitment {
    padding: 72px 0;
  }
}