.page-about {
  --about-year-color: var(--sky-blue);
  --about-line-gradient: linear-gradient(180deg, var(--sky-blue) 0%, var(--electric-teal) 55%, var(--sunset-orange) 100%);
  --about-tick-color: var(--electric-teal);
  position: relative;
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3) 0;
  max-width: var(--container-max);
  margin: 0 auto;
  font-size: 14px;
  color: var(--ink-blue);
}
.page-about .breadcrumb__link {
  color: var(--electric-teal);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
  padding: 4px 0;
}
.page-about .breadcrumb__link:hover {
  color: var(--sky-blue);
  text-decoration: underline;
}
.page-about .breadcrumb__current {
  color: var(--ink-blue);
  opacity: 0.72;
  padding: 4px 0;
}
.page-about .breadcrumb__link + .breadcrumb__current::before {
  content: "/";
  margin-right: var(--space-1);
  opacity: 0.4;
}

/* 首屏框景 */
.page-about .about-hero {
  padding: var(--space-2) var(--space-2) var(--space-5);
  max-width: calc(var(--container-max) + 48px);
  margin: 0 auto;
}
.page-about .about-hero__window {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--ink-blue);
  box-shadow: var(--shadow-lg);
}
.page-about .about-hero__stage {
  position: relative;
  aspect-ratio: 16 / 9;
  min-height: 420px;
  max-height: 680px;
}
.page-about .about-hero__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.page-about .about-hero__shade {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(16, 24, 40, 0.1) 0%, rgba(16, 24, 40, 0.35) 55%, rgba(16, 24, 40, 0.78) 100%);
  pointer-events: none;
}
.page-about .about-hero__silhouette {
  position: absolute;
  inset: auto 0 0 0;
  width: 100%;
  height: 42%;
  pointer-events: none;
}
.page-about .about-hero__content {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 8%;
  padding: 0 var(--space-4);
  z-index: 2;
}
.page-about .about-hero__content h1 {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.5rem, 4vw, 2.75rem);
  line-height: 1.18;
  color: var(--snow-white);
  margin: var(--space-2) 0 var(--space-2);
  max-width: 16em;
  text-shadow: 0 2px 12px rgba(16, 24, 40, 0.3);
}
.page-about .about-hero__lead {
  font-size: clamp(0.95rem, 1.6vw, 1.1rem);
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.9);
  max-width: 34em;
  margin: 0;
}
.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-2);
  margin: var(--space-3) 0 0;
  padding: var(--space-3) var(--space-2);
  background: var(--snow-white);
  border: 1px solid var(--boundary-gray);
  border-top: none;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}
.page-about .about-hero__stat {
  padding: var(--space-2) var(--space-2);
  background: var(--ice-blue-wash);
  border-radius: var(--radius-sm);
  text-align: center;
}
.page-about .about-hero__stat-label {
  font-size: 12px;
  color: var(--ink-blue);
  opacity: 0.7;
  margin-bottom: 2px;
}
.page-about .about-hero__stat-value {
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 500;
  color: var(--sky-blue);
  margin: 0;
}

/* 章节索引 */
.page-about .about-index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 500;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--sky-blue);
  opacity: 0.35;
  letter-spacing: -0.04em;
  margin-bottom: var(--space-1);
}

/* 区块通用 */
.page-about .section {
  padding: var(--space-5) var(--space-2);
  max-width: var(--container-max);
  margin: 0 auto;
}
.page-about .section .eyebrow {
  margin-bottom: var(--space-1);
}
.page-about .section h2 {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(1.5rem, 4vw, 2.4rem);
  line-height: 1.2;
  color: var(--ink-blue);
  margin: 0 0 var(--space-2);
}
.page-about .section-lead {
  font-size: 1rem;
  line-height: 1.65;
  color: var(--ink-blue);
  opacity: 0.78;
  max-width: 46em;
  margin: 0 0 var(--space-3);
}

/* 01 品牌发源 */
.page-about .about-origin {
  background: var(--snow-white);
  border-bottom: 1px solid var(--boundary-gray);
}
.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}
.page-about .about-origin__body p {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--ink-blue);
  margin: 0 0 var(--space-3);
}
.page-about .about-origin__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-2);
  margin-top: var(--space-3);
}
.page-about .about-stat {
  background: var(--high-altitude-gray);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-2);
  text-align: center;
  border-left: 3px solid var(--sky-blue);
}
.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 500;
  color: var(--sky-blue);
  line-height: 1.2;
}
.page-about .about-stat__label {
  display: block;
  font-size: 13px;
  color: var(--ink-blue);
  opacity: 0.68;
  margin-top: 4px;
}

/* 02 里程碑时间轴 */
.page-about .about-milestones {
  background: var(--high-altitude-gray);
  border-bottom: 1px solid var(--boundary-gray);
}
.page-about .about-milestones__head {
  margin-bottom: var(--space-5);
}
.page-about .about-timeline {
  position: relative;
  padding-left: 36px;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 4px;
  bottom: 4px;
  width: 3px;
  background: var(--about-line-gradient);
  border-radius: var(--radius-full);
}
.page-about .about-timeline__item {
  position: relative;
  margin-bottom: var(--space-4);
}
.page-about .about-timeline__item:last-child {
  margin-bottom: 0;
}
.page-about .about-timeline__dot {
  position: absolute;
  left: -31px;
  top: 26px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--sky-blue);
  border: 3px solid var(--snow-white);
  box-shadow: 0 0 0 2px var(--sky-blue);
  z-index: 2;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}
.page-about .about-timeline__item:hover .about-timeline__dot {
  transform: scale(1.2);
  box-shadow: 0 0 0 4px var(--electric-teal);
}
.page-about .about-timeline__card {
  background: var(--snow-white);
  border: 1px solid var(--boundary-gray);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-3);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}
.page-about .about-timeline__item:hover .about-timeline__card {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.page-about .about-timeline__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--sunset-orange);
  background: rgba(255, 109, 0, 0.1);
  border-radius: var(--radius-sm);
  padding: 2px 10px;
  margin-bottom: var(--space-2);
}
.page-about .about-timeline__card h3 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink-blue);
  margin: 0 0 var(--space-1);
}
.page-about .about-timeline__card p {
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--ink-blue);
  opacity: 0.78;
  margin: 0;
}

/* 03 资质与认证 */
.page-about .about-cert {
  background: var(--ice-blue-wash);
  border-bottom: 1px solid var(--boundary-gray);
  max-width: none;
  padding-left: var(--space-2);
  padding-right: var(--space-2);
}
.page-about .about-cert .container {
  max-width: var(--container-max);
  margin: 0 auto;
}
.page-about .about-cert__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}
.page-about .about-cert__list {
  list-style: none;
  margin: var(--space-3) 0 0;
  padding: 0;
}
.page-about .about-cert__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  background: var(--snow-white);
  border: 1px solid var(--boundary-gray);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  margin-bottom: var(--space-2);
  transition: box-shadow 0.2s ease;
}
.page-about .about-cert__item:hover {
  box-shadow: var(--shadow-sm);
}
.page-about .about-cert__badge {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: var(--radius-full);
  background: var(--sky-blue);
  color: var(--snow-white);
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 13px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.page-about .about-cert__item-body h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink-blue);
  margin: 0 0 4px;
}
.page-about .about-cert__item-body p {
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--ink-blue);
  opacity: 0.7;
  margin: 0;
}
.page-about .about-cert__figure {
  margin: 0;
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.page-about .about-cert__img {
  width: 100%;
  height: auto;
  max-height: 480px;
  object-fit: cover;
  display: block;
}
.page-about .about-cert__figure figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--space-2) var(--space-3);
  background: rgba(16, 24, 40, 0.65);
  color: var(--snow-white);
  font-size: 13px;
  backdrop-filter: blur(4px);
}

/* 04 合作生态 */
.page-about .about-partners {
  background: var(--snow-white);
  border-bottom: 1px solid var(--boundary-gray);
}
.page-about .about-partners__head {
  margin-bottom: var(--space-4);
}
.page-about .about-partners__tabs .about-partners__tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-bottom: 1px solid var(--boundary-gray);
  margin-bottom: var(--space-3);
}
.page-about .about-partners__tabs .tabs__btn {
  appearance: none;
  background: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink-blue);
  opacity: 0.68;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, opacity 0.2s ease;
  min-height: 44px;
}
.page-about .about-partners__tabs .tabs__btn:hover {
  color: var(--sky-blue);
  opacity: 1;
}
.page-about .about-partners__tabs .tabs__btn.is-active {
  color: var(--sky-blue);
  border-bottom-color: var(--sky-blue);
  opacity: 1;
}
.page-about .about-partners__tabs .tabs__panel {
  display: none;
}
.page-about .about-partners__tabs .tabs__panel.is-active {
  display: block;
}
.page-about .about-partners__panel-lead {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--ink-blue);
  margin: 0 0 var(--space-2);
}
.page-about .about-partners__intro {
  font-size: 1rem;
  line-height: 1.65;
  color: var(--ink-blue);
  margin-bottom: var(--space-4);
}
.page-about .about-partners__honors {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
}
.page-about .about-honor {
  background: var(--high-altitude-gray);
  border-left: 4px solid var(--sunset-orange);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
}
.page-about .about-honor__icon {
  color: var(--sunset-orange);
  font-size: 1.2rem;
  display: block;
  margin-bottom: 6px;
}
.page-about .about-honor h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink-blue);
  margin: 0 0 4px;
}
.page-about .about-honor p {
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--ink-blue);
  opacity: 0.75;
  margin: 0;
}
.page-about .about-partners__list {
  list-style: none;
  margin: var(--space-3) 0;
  padding: 0;
}
.page-about .about-partners__list-item {
  position: relative;
  padding: var(--space-2) var(--space-3) var(--space-2) var(--space-4);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink-blue);
  background: var(--snow-white);
  border: 1px solid var(--boundary-gray);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-2);
}
.page-about .about-partners__list-item::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--electric-teal);
}
.page-about .about-partners__footnote {
  margin-top: var(--space-2);
}

/* 05 团队形态 */
.page-about .about-team {
  background: var(--high-altitude-gray);
}
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}
.page-about .about-team__chart {
  margin-top: var(--space-3);
  border-left: 2px solid var(--boundary-gray);
  padding-left: var(--space-4);
}
.page-about .about-team__branch {
  position: relative;
  margin-bottom: var(--space-3);
}
.page-about .about-team__branch::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--space-4) + 1px);
  top: 26px;
  width: 16px;
  height: 2px;
  background: var(--boundary-gray);
}
.page-about .about-team__branch::after {
  content: "";
  position: absolute;
  left: calc(-1 * var(--space-4) - 5px);
  top: 20px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--sky-blue);
  border: 3px solid var(--snow-white);
  box-shadow: 0 0 0 2px var(--sky-blue);
}
.page-about .about-team__branch summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  list-style: none;
  cursor: pointer;
  padding: var(--space-2) var(--space-3);
  background: var(--snow-white);
  border: 1px solid var(--boundary-gray);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink-blue);
  min-height: 44px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.page-about .about-team__branch summary::-webkit-details-marker {
  display: none;
}
.page-about .about-team__branch summary:hover {
  border-color: var(--sky-blue);
  box-shadow: var(--shadow-sm);
}
.page-about .about-team__branch summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--sky-blue);
  transition: transform 0.2s ease;
}
.page-about .about-team__branch[open] summary::after {
  content: "\2212";
}
.page-about .about-team__branch-title {
  flex: 1;
}
.page-about .about-team__branch-count {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 500;
  color: var(--sky-blue);
  background: var(--ice-blue-wash);
  border-radius: var(--radius-sm);
  padding: 2px 10px;
}
.page-about .about-team__branch-body {
  padding: var(--space-2) var(--space-3) var(--space-3);
  background: var(--snow-white);
  border: 1px solid var(--boundary-gray);
  border-top: none;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}
.page-about .about-team__branch-body p {
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--ink-blue);
  opacity: 0.8;
  margin: 0;
}
.page-about .about-team__figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  position: relative;
}
.page-about .about-team__img {
  width: 100%;
  height: auto;
  max-height: 520px;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}
.page-about .about-team__figure:hover .about-team__img {
  transform: scale(1.02);
}
.page-about .about-team__figure figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--space-2) var(--space-3);
  background: rgba(16, 24, 40, 0.6);
  color: var(--snow-white);
  font-size: 13px;
  backdrop-filter: blur(4px);
}

/* 信任区块 */
.page-about .about-trust {
  background: var(--ink-blue);
  color: var(--snow-white);
  max-width: none;
  padding: var(--space-6) var(--space-2);
}
.page-about .about-trust .container {
  max-width: var(--container-max);
  margin: 0 auto;
  text-align: center;
}
.page-about .about-trust__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.page-about .about-trust__quote {
  font-family: var(--font-heading);
  font-size: clamp(1.1rem, 2.8vw, 1.6rem);
  font-weight: 700;
  line-height: 1.5;
  max-width: 28em;
  margin: var(--space-3) 0 var(--space-4);
}
.page-about .about-trust__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
}
.page-about .about-trust__links .btn--ghost {
  border-color: rgba(255, 255, 255, 0.5);
  color: var(--snow-white);
}
.page-about .about-trust__links .btn--ghost:hover {
  border-color: var(--sunset-orange);
  color: var(--sunset-orange);
}

/* 响应式增强 */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .about-origin__stats {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .about-partners__honors {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .page-about .about-hero__content {
    padding: 0 var(--space-5);
  }
  .page-about .about-origin__grid {
    grid-template-columns: minmax(200px, 0.75fr) 2fr;
    gap: var(--space-5);
    align-items: start;
  }
  .page-about .about-cert__grid {
    grid-template-columns: 1.2fr 0.8fr;
    gap: var(--space-5);
    align-items: start;
  }
  .page-about .about-team__grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: var(--space-5);
    align-items: start;
  }
  .page-about .about-team__figure {
    margin-top: var(--space-5);
  }
}

@media (min-width: 900px) {
  .page-about .about-timeline {
    display: grid;
    grid-template-columns: 1fr 3px 1fr;
    gap: 0 var(--space-4);
    padding-left: 0;
  }
  .page-about .about-timeline::before {
    grid-column: 2;
    grid-row: 1 / -1;
    left: auto;
    right: auto;
    justify-self: center;
    top: 4px;
    bottom: 4px;
  }
  .page-about .about-timeline__item {
    grid-column: 1;
    padding-right: var(--space-4);
    text-align: right;
    margin-bottom: var(--space-3);
  }
  .page-about .about-timeline__item:nth-child(even) {
    grid-column: 3;
    text-align: left;
    padding-right: 0;
    padding-left: var(--space-4);
  }
  .page-about .about-timeline__dot {
    left: auto;
    right: -8px;
    top: 28px;
  }
  .page-about .about-timeline__item:nth-child(even) .about-timeline__dot {
    right: auto;
    left: -8px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero {
    padding: var(--space-3) var(--space-3) var(--space-5);
  }
  .page-about .about-hero__stats {
    margin-top: var(--space-3);
  }
  .page-about .section {
    padding: var(--space-6) var(--space-3);
  }
}