/* ===== 页面：品牌档案 ===== */
.page-about {
  max-width: 100%;
  overflow-x: hidden;
  color: var(--color-text);
  font-family: var(--font-body);
  background: var(--color-bg);
}

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

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-head);
  letter-spacing: 0.01em;
  line-height: 1.15;
}

/* ---------- 面包屑 ---------- */
.page-about .about-breadcrumb {
  margin-bottom: 40px;
  padding-top: 8px;
}

.page-about .about-breadcrumb a {
  color: rgba(255, 255, 255, 0.72);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .about-breadcrumb a:hover,
.page-about .about-breadcrumb a:focus-visible {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-about .about-breadcrumb span[aria-current="page"] {
  color: rgba(255, 255, 255, 0.92);
}

/* ---------- 首屏简介 ---------- */
.page-about .about-intro {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-2) 100%);
  color: #fff;
  padding: 56px 0 72px;
  position: relative;
  overflow: hidden;
}

.page-about .about-intro::after {
  content: "";
  position: absolute;
  right: -90px;
  bottom: -70px;
  width: 260px;
  height: 260px;
  border: 2px solid rgba(255, 107, 53, 0.35);
  transform: rotate(45deg);
  pointer-events: none;
}

.page-about .about-intro::before {
  content: "";
  position: absolute;
  right: 40px;
  top: 40px;
  width: 120px;
  height: 120px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  transform: rotate(45deg);
  pointer-events: none;
}

.page-about .about-intro__inner {
  display: grid;
  gap: 32px;
  position: relative;
  z-index: 1;
}

.page-about .about-intro__title {
  font-size: clamp(2.4rem, 6vw, 4rem);
  text-transform: uppercase;
  margin: 12px 0 16px;
  letter-spacing: 0.02em;
}

.page-about .about-intro__lead {
  font-size: 1.125rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.88);
  max-width: 640px;
}

.page-about .about-intro__desc {
  font-size: 0.95rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.66);
  max-width: 560px;
}

.page-about .about-intro__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 0;
  padding: 24px 0 0;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}

.page-about .about-intro__stat {
  margin: 0;
  padding-right: 8px;
}

.page-about .about-intro__stat dt {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.56);
  margin-bottom: 6px;
}

.page-about .about-intro__stat dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3vw, 1.8rem);
  font-weight: 700;
  color: var(--color-accent);
}

/* ---------- 品牌定位 ---------- */
.page-about .about-position {
  background: var(--color-white);
  padding: 72px 0;
  position: relative;
}

.page-about .about-position::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 180px;
  height: 8px;
  background: var(--color-accent);
}

.page-about .about-position__grid {
  display: grid;
  gap: 48px;
}

.page-about .about-position__intro .section-tag {
  color: var(--color-accent);
}

.page-about .about-position__intro h2 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  margin: 12px 0 16px;
  text-transform: uppercase;
}

.page-about .about-position__divider {
  width: 72px;
  height: 4px;
  background: var(--color-accent);
  margin-bottom: 24px;
  clip-path: polygon(0 0, 100% 0, 82% 100%, 0 100%);
}

.page-about .about-position__lead {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 16px;
}

.page-about .about-position__intro > p:last-child {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.page-about .about-position__values {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-position__value {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 16px;
  padding: 20px 20px 20px 0;
  border-bottom: 1px solid var(--color-border);
  transition: background 0.2s ease;
}

.page-about .about-position__value:hover {
  background: linear-gradient(90deg, rgba(255, 107, 53, 0.05), transparent);
}

.page-about .about-position__index {
  font-family: var(--font-head);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  padding-top: 2px;
}

.page-about .about-position__value h3 {
  font-size: 1.15rem;
  margin: 0 0 6px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.page-about .about-position__value p {
  margin: 0;
  line-height: 1.65;
  color: var(--color-text-secondary);
}

/* ---------- 发展历程 ---------- */
.page-about .about-timeline-section {
  background: var(--color-bg);
  padding: 72px 0 88px;
  position: relative;
}

.page-about .about-timeline-section::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 160px;
  background: linear-gradient(to top, rgba(10, 25, 47, 0.04), transparent);
  pointer-events: none;
}

.page-about .about-timeline-section__head {
  max-width: 560px;
  margin-bottom: 56px;
}

.page-about .about-timeline-section__head .section-tag {
  color: var(--color-accent);
}

.page-about .about-timeline-section__head h2 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin: 12px 0;
  text-transform: uppercase;
}

.page-about .about-timeline-section__head p {
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 0;
}

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

.page-about .about-timeline__rail {
  position: absolute;
  left: 19px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, transparent, var(--color-accent) 12%, var(--color-border) 75%, transparent);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 56px;
  margin-bottom: 36px;
}

.page-about .about-timeline__item:last-child {
  margin-bottom: 0;
}

.page-about .about-timeline__node {
  position: absolute;
  left: 11px;
  top: 18px;
  width: 18px;
  height: 18px;
  background: var(--color-accent);
  transform: rotate(45deg);
  z-index: 2;
  box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.16);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-timeline__item:hover .about-timeline__node,
.page-about .about-timeline__item:focus-within .about-timeline__node {
  transform: rotate(45deg) scale(1.3);
  box-shadow: 0 0 0 6px rgba(255, 107, 53, 0.2);
}

.page-about .about-timeline__year {
  font-family: var(--font-head);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 4px;
  line-height: 1.1;
}

.page-about .about-timeline__year .live-badge {
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--color-live);
  color: #fff;
  padding: 4px 10px;
  border-radius: var(--radius);
  vertical-align: middle;
}

.page-about .about-timeline__panel {
  background: rgba(255, 255, 255, 0.72);
  padding: 20px 24px;
  border-left: 3px solid transparent;
  border-radius: var(--radius);
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-timeline__item:hover .about-timeline__panel,
.page-about .about-timeline__item:focus-within .about-timeline__panel {
  border-left-color: var(--color-accent);
  transform: translateX(4px);
  box-shadow: var(--shadow-soft);
}

.page-about .about-timeline__panel h3 {
  font-size: 1.15rem;
  margin: 0 0 8px;
  text-transform: uppercase;
}

.page-about .about-timeline__panel p {
  margin: 0;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

/* ---------- 媒体图块 ---------- */
.page-about .about-media {
  margin: 0;
  padding: 0;
  position: relative;
  overflow: hidden;
}

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

.page-about .about-media--datawall {
  background: var(--color-primary);
}

.page-about .about-media--datawall img {
  max-height: 520px;
  opacity: 0.88;
}

.page-about .about-media--datawall .exhibit-label {
  position: absolute;
  left: 20px;
  bottom: 20px;
  margin: 0;
}

.page-about .about-media--infra {
  background: var(--color-primary-2);
}

.page-about .about-media--infra img {
  max-height: 720px;
  opacity: 0.9;
}

.page-about .about-media__caption {
  padding: 14px 20px;
  background: rgba(10, 25, 47, 0.7);
}

.page-about .exhibit-label {
  display: inline-block;
  background: rgba(10, 25, 47, 0.78);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 8px 14px;
  border-left: 3px solid var(--color-accent);
  backdrop-filter: blur(4px);
}

.page-about .exhibit-label--dark {
  background: rgba(10, 25, 47, 0.5);
}

/* ---------- 资质与认证 ---------- */
.page-about .about-credentials {
  background: var(--color-white);
  padding: 72px 0 88px;
}

.page-about .about-credentials__intro {
  max-width: 620px;
  margin-bottom: 48px;
}

.page-about .about-credentials__intro .section-tag {
  color: var(--color-accent);
}

.page-about .about-credentials__intro h2 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin: 12px 0 16px;
  text-transform: uppercase;
}

.page-about .about-credentials__intro p {
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 0;
}

.page-about .about-credentials__list {
  display: grid;
  gap: 20px;
}

.page-about .about-credential {
  background: linear-gradient(160deg, rgba(10, 25, 47, 0.04), rgba(10, 25, 47, 0.01));
  padding: 32px 28px;
  border-left: 3px solid var(--color-accent);
  position: relative;
  transition: background 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-credential:hover {
  background: linear-gradient(160deg, rgba(10, 25, 47, 0.07), rgba(10, 25, 47, 0.02));
  box-shadow: var(--shadow-soft);
}

.page-about .about-credential__badge {
  width: 56px;
  height: 56px;
  display: grid;
  place-items: center;
  background: var(--color-white);
  color: var(--color-accent);
  border-radius: var(--radius);
  margin-bottom: 20px;
  box-shadow: 0 8px 20px rgba(10, 25, 47, 0.08);
}

.page-about .about-credential__badge svg {
  display: block;
}

.page-about .about-credential h3 {
  font-size: 1.1rem;
  text-transform: uppercase;
  margin: 0 0 10px;
}

.page-about .about-credential p {
  margin: 0;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

/* ---------- 团队与服务网络 ---------- */
.page-about .about-team {
  background: var(--color-bg);
  padding: 72px 0;
  position: relative;
}

.page-about .about-team::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent), transparent 70%);
}

.page-about .about-team__intro {
  max-width: 640px;
  margin-bottom: 48px;
}

.page-about .about-team__intro .section-tag {
  color: var(--color-accent);
}

.page-about .about-team__intro h2 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin: 12px 0 16px;
  text-transform: uppercase;
}

.page-about .about-team__intro p {
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 0;
}

.page-about .about-team__grid {
  display: grid;
  gap: 40px;
}

.page-about .about-team__chart-block {
  text-align: center;
}

.page-about .about-team__chart {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 12px;
}

.page-about .about-team__chart svg {
  max-width: 220px;
  height: auto;
  overflow: visible;
}

.page-about .about-team__chart-num {
  font-family: var(--font-head);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .about-team__chart-label {
  font-family: var(--font-body);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.page-about .about-team__chart-block .exhibit-label {
  display: inline-block;
  background: rgba(10, 25, 47, 0.06);
  color: var(--color-text-secondary);
  border-left-color: var(--color-accent);
}

/* ---------- 团队标签页 ---------- */
.page-about .about-tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 12px;
  margin-bottom: 24px;
}

.page-about .about-tabs .tab-button {
  font-family: var(--font-head);
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 8px 18px;
  border: 1px solid var(--color-border);
  background: var(--color-white);
  color: var(--color-text-secondary);
  cursor: pointer;
  border-radius: var(--radius);
  transition: all 0.2s ease;
}

.page-about .about-tabs .tab-button:hover,
.page-about .about-tabs .tab-button:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-primary);
}

.page-about .about-tabs .tab-button.is-active,
.page-about .about-tabs .tab-button[aria-selected="true"] {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.page-about .about-tabs .tab-panel {
  background: var(--color-white);
  padding: 28px;
  border-left: 3px solid var(--color-accent);
  box-shadow: var(--shadow-soft);
}

.page-about .about-tabs .tab-panel[hidden] {
  display: none;
}

.page-about .about-tabs__ratio {
  font-family: var(--font-head);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 0 4px;
  line-height: 1;
}

.page-about .about-tabs__ratio span {
  color: var(--color-accent);
  font-size: 1.4rem;
}

.page-about .about-tabs .tab-panel h3 {
  font-size: 1.1rem;
  text-transform: uppercase;
  margin: 0 0 10px;
}

.page-about .about-tabs .tab-panel p:last-child {
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 0;
}

/* ---------- 团队抽象视觉 ---------- */
.page-about .about-media--team {
  background: var(--color-primary);
  padding: 0;
}

.page-about .about-media--team img {
  max-height: 680px;
  opacity: 0.85;
}

.page-about .about-media--team .exhibit-label {
  position: absolute;
  left: 20px;
  bottom: 20px;
  margin: 0;
  max-width: calc(100% - 40px);
}

/* ---------- 服务网络 ---------- */
.page-about .about-network {
  background: var(--color-primary);
  color: #fff;
  padding: 72px 0 88px;
  position: relative;
  overflow: hidden;
}

.page-about .about-network::after {
  content: "";
  position: absolute;
  right: -120px;
  top: -140px;
  width: 360px;
  height: 360px;
  border: 2px solid rgba(255, 107, 53, 0.25);
  transform: rotate(45deg);
  pointer-events: none;
}

.page-about .about-network__grid {
  display: grid;
  gap: 48px;
  position: relative;
  z-index: 1;
}

.page-about .about-network__intro .section-tag {
  color: var(--color-accent);
}

.page-about .about-network__intro h2 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin: 12px 0 16px;
  text-transform: uppercase;
}

.page-about .about-network__intro p {
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.7;
  margin-bottom: 16px;
}

.page-about .about-network__trust {
  margin-top: 28px;
  background: rgba(255, 255, 255, 0.06);
  border-left: 4px solid var(--color-accent);
  padding: 18px 20px;
}

.page-about .about-network__trust strong {
  display: block;
  font-family: var(--font-head);
  font-size: 1rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.page-about .about-network__trust p {
  margin: 0;
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.95rem;
}

.page-about .about-network__map-wrap {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 16px;
}

.page-about .about-network__map {
  background: radial-gradient(closest-side, rgba(255, 107, 53, 0.22), transparent 72%);
  padding: 20px;
  border-radius: 50%;
  width: 100%;
  max-width: 560px;
}

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

/* ---------- 行动引导 ---------- */
.page-about .about-cta {
  background: var(--color-accent);
  color: var(--color-primary);
  padding: 56px 0;
  position: relative;
  overflow: hidden;
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(115deg, rgba(10, 25, 47, 0.12), transparent 60%);
  pointer-events: none;
}

.page-about .about-cta__inner {
  display: grid;
  gap: 28px;
  position: relative;
  z-index: 1;
}

.page-about .about-cta .section-tag {
  color: var(--color-primary);
  font-weight: 700;
}

.page-about .about-cta h2 {
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  text-transform: uppercase;
  margin: 10px 0 12px;
}

.page-about .about-cta p {
  margin: 0;
  font-size: 1rem;
  color: rgba(10, 25, 47, 0.86);
  line-height: 1.7;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.page-about .about-cta .btn--accent {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  padding: 14px 28px;
  text-decoration: none;
  font-family: var(--font-head);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius);
  transition: all 0.2s ease;
}

.page-about .about-cta .btn--accent:hover,
.page-about .about-cta .btn--accent:focus-visible {
  background: var(--color-primary-2);
  border-color: var(--color-primary-2);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lift);
}

.page-about .about-cta .btn--ghost {
  display: inline-block;
  background: transparent;
  color: var(--color-primary);
  padding: 12px 26px;
  text-decoration: none;
  font-family: var(--font-head);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius);
  transition: all 0.2s ease;
}

.page-about .about-cta .btn--ghost:hover,
.page-about .about-cta .btn--ghost:focus-visible {
  background: var(--color-primary);
  color: var(--color-accent);
  transform: translateY(-2px);
}

/* ---------- 桌面端增强 ---------- */
@media (min-width: 768px) {
  .page-about .about-intro {
    padding: 72px 0 88px;
  }

  .page-about .about-intro__inner {
    grid-template-columns: 1.4fr 0.6fr;
    align-items: end;
    gap: 48px;
  }

  .page-about .about-intro__stats {
    grid-template-columns: 1fr;
    gap: 16px;
    border-top: none;
    border-left: 1px solid rgba(255, 255, 255, 0.16);
    padding: 0 0 0 28px;
  }

  .page-about .about-position__grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 64px;
    align-items: start;
  }

  .page-about .about-position {
    padding: 88px 0;
  }

  .page-about .about-timeline-section {
    padding: 88px 0 104px;
  }

  .page-about .about-timeline {
    padding-top: 8px;
  }

  .page-about .about-timeline__rail {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 1fr 48px 1fr;
    grid-template-rows: auto;
    column-gap: 24px;
    align-items: start;
    padding-left: 0;
    margin-bottom: 32px;
  }

  .page-about .about-timeline__node {
    position: static;
    grid-column: 2;
    grid-row: 1;
    justify-self: center;
    align-self: start;
    margin-top: 22px;
  }

  .page-about .about-timeline__year {
    grid-row: 1;
    margin: 0;
    padding-top: 14px;
  }

  .page-about .about-timeline__panel {
    grid-row: 1;
    padding: 24px 28px;
  }

  .page-about .about-timeline__item:nth-child(odd) .about-timeline__year {
    grid-column: 1;
    text-align: right;
  }

  .page-about .about-timeline__item:nth-child(odd) .about-timeline__panel {
    grid-column: 3;
  }

  .page-about .about-timeline__item:nth-child(even) .about-timeline__year {
    grid-column: 3;
    text-align: left;
  }

  .page-about .about-timeline__item:nth-child(even) .about-timeline__panel {
    grid-column: 1;
    text-align: right;
  }

  .page-about .about-timeline__item:hover .about-timeline__panel {
    transform: translateX(4px);
  }

  .page-about .about-timeline__item:nth-child(even):hover .about-timeline__panel {
    transform: translateX(-4px);
  }

  .page-about .about-credentials {
    padding: 88px 0 104px;
  }

  .page-about .about-credentials__list {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .page-about .about-team {
    padding: 88px 0;
  }

  .page-about .about-team__grid {
    grid-template-columns: 0.8fr 1.2fr;
    gap: 56px;
    align-items: center;
  }

  .page-about .about-team__chart-block {
    text-align: left;
  }

  .page-about .about-team__chart-block .exhibit-label {
    margin-top: 8px;
  }

  .page-about .about-network {
    padding: 88px 0 104px;
  }

  .page-about .about-network__grid {
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
  }

  .page-about .about-cta__inner {
    grid-template-columns: 1.3fr 0.7fr;
    align-items: center;
    gap: 48px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-intro__lead {
    font-size: 1.25rem;
  }

  .page-about .about-intro__stats {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .page-about .about-position__values {
    gap: 8px;
  }

  .page-about .about-position__value {
    padding: 24px 20px 24px 0;
  }

  .page-about .about-media--datawall img {
    max-height: 580px;
  }

  .page-about .about-media--infra img {
    max-height: 760px;
  }

  .page-about .about-media--team img {
    max-height: 720px;
  }
}