/* ===== 品牌档案页专属样式 ===== */
.page-about {
  position: relative;
  background:
    radial-gradient(1200px 420px at 85% 0%, rgba(67, 115, 184, 0.2), transparent 60%),
    radial-gradient(900px 360px at 10% 30%, rgba(255, 140, 66, 0.06), transparent 55%),
    var(--c-space);
  color: var(--c-surface);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin: 0 0 20px;
  font-size: 14px;
  color: rgba(232, 240, 254, 0.6);
}

.page-about .breadcrumb a {
  color: rgba(232, 240, 254, 0.85);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.page-about .breadcrumb a:hover {
  color: var(--c-action);
}

.page-about .about-header {
  display: flex;
  flex-direction: column;
  gap: 28px;
  align-items: flex-start;
  margin-bottom: 64px;
  padding-top: 8px;
}

.page-about .about-header-left {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .about-header-left .directory-title {
  color: var(--c-surface);
  font-size: clamp(28px, 5vw, 46px);
  line-height: 1.12;
  margin-top: 4px;
}

.page-about .directory-kicker {
  color: var(--c-action);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .directory-intro {
  color: rgba(232, 240, 254, 0.75);
  font-size: 16px;
  line-height: 1.75;
  max-width: 640px;
}

.page-about .about-header .directory-index {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-header .tag {
  color: rgba(232, 240, 254, 0.85);
  border: 1px solid rgba(232, 240, 254, 0.28);
  background: rgba(11, 27, 61, 0.4);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
  font-size: 14px;
  text-decoration: none;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.page-about .about-header .tag:hover,
.page-about .about-header .tag--orange {
  background: var(--c-action);
  border-color: var(--c-action);
  color: #fff;
}

.page-about .about-header-visual {
  display: flex;
  justify-content: flex-start;
}

.page-about .about-brand-mark-img {
  width: 180px;
  height: 180px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  background: linear-gradient(145deg, rgba(232, 240, 254, 0.14), rgba(255, 255, 255, 0.04));
  border: 1px solid rgba(232, 240, 254, 0.16);
  padding: 14px;
  box-shadow: var(--shadow-md);
}

.page-about .about-mission,
.page-about .about-timeline,
.page-about .about-commitments,
.page-about .about-team,
.page-about .about-next {
  margin-bottom: 72px;
}

.page-about .exhibit-num {
  color: var(--c-action);
}

.page-about .section-title {
  color: var(--c-surface);
}

.page-about .section-desc {
  color: rgba(232, 240, 254, 0.65);
}

/* ---- 品牌使命 ---- */
.page-about .about-mission {
  padding: 28px 0 0;
}

.page-about .mission-layout {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-top: 24px;
}

.page-about .mission-main {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02));
  border: 1px solid rgba(232, 240, 254, 0.1);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
}

.page-about .mission-main .page-desc {
  color: rgba(232, 240, 254, 0.85);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .mission-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .mission-stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
  background: rgba(11, 27, 61, 0.45);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  border-left: 3px solid var(--c-action);
}

.page-about .mission-stat-num {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 26px;
  color: var(--c-action);
}

.page-about .mission-stat-label {
  color: rgba(232, 240, 254, 0.7);
  font-size: 14px;
}

.page-about .mission-aside {
  background: var(--c-bg-soft);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  border-top: 3px solid var(--c-action);
  box-shadow: var(--shadow-md);
}

.page-about .mission-aside .card-title {
  color: var(--c-text);
  margin-bottom: 14px;
}

.page-about .mission-scope-list {
  list-style: none;
  padding: 0;
  margin: 0 0 16px;
  display: grid;
  gap: 10px;
}

.page-about .mission-scope-list li {
  position: relative;
  padding-left: 26px;
  color: var(--c-text);
  font-weight: 600;
  font-size: 15px;
}

.page-about .mission-scope-list li::before {
  content: '';
  position: absolute;
  left: 2px;
  top: 4px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-action);
}

.page-about .mission-aside .contact-note {
  color: var(--c-muted);
  font-size: 14px;
  line-height: 1.7;
  margin: 0;
}

.page-about .mission-aside .contact-note a {
  color: var(--c-interact);
  text-decoration: none;
}

/* ---- 发展轨迹 ---- */
.page-about .about-timeline {
  position: relative;
  padding: 32px 0;
}

.page-about .timeline-wrap {
  position: relative;
  margin-top: 28px;
}

.page-about .timeline {
  position: relative;
  display: grid;
  gap: 20px;
}

.page-about .timeline::before {
  content: '';
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 19px;
  width: 2px;
  background: linear-gradient(to bottom, var(--c-action), rgba(67, 115, 184, 0.4));
  border-radius: 2px;
}

.page-about .timeline-item {
  position: relative;
  padding-left: 54px;
  background: transparent;
}

.page-about .timeline-summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(232, 240, 254, 0.12);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

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

.page-about .timeline-summary:hover,
.page-about .timeline-summary:focus-visible {
  background: rgba(255, 255, 255, 0.11);
  border-color: rgba(255, 140, 66, 0.5);
}

.page-about .timeline-dot {
  position: absolute;
  left: 0;
  top: 12px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--c-action);
  color: var(--c-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 14px;
  box-shadow: 0 0 0 5px rgba(255, 140, 66, 0.18), var(--shadow-orange);
  z-index: 1;
}

.page-about .timeline-year {
  font-family: var(--font-mono);
  color: var(--c-action);
  font-weight: 700;
  font-size: 14px;
}

.page-about .timeline-heading {
  color: var(--c-surface);
  font-weight: 700;
  font-size: 16px;
}

.page-about .timeline-toggle {
  margin-left: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.14);
  color: var(--c-surface);
  font-size: 18px;
  line-height: 1;
  transition: transform var(--transition-fast), background var(--transition-fast);
}

.page-about .timeline-item[open] .timeline-toggle {
  transform: rotate(45deg);
  background: var(--c-action);
}

.page-about .timeline-item[open] .timeline-summary {
  border-color: rgba(255, 140, 66, 0.6);
}

.page-about .timeline-card {
  margin-top: 6px;
  background: var(--c-surface);
  color: var(--c-text);
  border-radius: var(--radius-md);
  padding: 20px 18px;
  border-top: 3px solid var(--c-action);
  box-shadow: var(--shadow-md);
  font-size: 15px;
  line-height: 1.75;
}

.page-about .timeline-card p {
  margin: 0 0 8px;
}

.page-about .timeline-card p:last-child {
  margin-bottom: 0;
}

.page-about .timeline-bg {
  margin-top: 40px;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  object-fit: cover;
  border: 1px solid rgba(232, 240, 254, 0.12);
  box-shadow: var(--shadow-lg);
}

/* ---- 资质与服务承诺 ---- */
.page-about .about-commitments {
  padding: 32px 0;
}

.page-about .commitments-grid {
  display: grid;
  gap: 18px;
  margin-top: 24px;
}

.page-about .commitment-card {
  background: var(--c-surface);
  color: var(--c-text);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(11, 27, 61, 0.08);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.page-about .commitment-card:hover,
.page-about .commitment-card:focus-within {
  border-color: var(--c-action);
  box-shadow: var(--shadow-orange);
  transform: translateY(-4px);
}

.page-about .commitment-card--dark {
  background: linear-gradient(145deg, #162a54, var(--c-space));
  color: var(--c-surface);
  border-color: rgba(232, 240, 254, 0.1);
}

.page-about .commitment-card--dark .card-title {
  color: var(--c-surface);
}

.page-about .commitment-card--dark .commitment-desc {
  color: rgba(232, 240, 254, 0.75);
}

.page-about .commitment-card--dark:hover,
.page-about .commitment-card--dark:focus-within {
  border-color: var(--c-action);
  box-shadow: 0 6px 20px rgba(255, 140, 66, 0.35);
}

.page-about .commitment-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--c-bg-soft);
  color: var(--c-aux);
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 15px;
  flex-shrink: 0;
}

.page-about .commitment-card--dark .commitment-badge {
  background: rgba(255, 255, 255, 0.12);
  color: var(--c-action);
}

.page-about .commitment-desc {
  color: var(--c-muted);
  font-size: 15px;
  line-height: 1.75;
  margin: 0;
}

/* ---- 团队与分工 ---- */
.page-about .about-team {
  padding: 32px 0;
}

.page-about .about-team-visual {
  margin: 24px 0;
}

.page-about .team-collab-img {
  width: 100%;
  height: auto;
  max-width: 480px;
  border-radius: var(--radius-lg);
  object-fit: cover;
  box-shadow: var(--shadow-lg);
}

.page-about .team-groups {
  display: grid;
  gap: 14px;
}

.page-about .team-group {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(232, 240, 254, 0.12);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.page-about .team-group[open] {
  border-color: rgba(255, 140, 66, 0.55);
  background: rgba(255, 255, 255, 0.1);
}

.page-about .team-group-summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  flex-wrap: wrap;
}

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

.page-about .team-group-badge {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--c-action);
  color: var(--c-surface);
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.page-about .team-group-title {
  font-weight: 700;
  color: var(--c-surface);
}

.page-about .team-group-hint {
  color: rgba(232, 240, 254, 0.55);
  font-size: 13px;
  flex-basis: 100%;
  padding-left: 56px;
  margin-top: -8px;
}

.page-about .team-group-toggle {
  margin-left: auto;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  color: var(--c-surface);
  transition: transform var(--transition), background var(--transition-fast);
}

.page-about .team-group[open] .team-group-toggle {
  transform: rotate(45deg);
  background: var(--c-action);
}

.page-about .team-duties {
  margin: 0;
  padding: 0 16px 18px 56px;
  display: grid;
  gap: 8px;
}

.page-about .team-duties li {
  color: rgba(232, 240, 254, 0.75);
  font-size: 14px;
  line-height: 1.65;
}

/* ---- 延伸入口 ---- */
.page-about .about-next {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(232, 240, 254, 0.12);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: center;
}

.page-about .about-next .section-title {
  color: var(--c-surface);
  margin-bottom: 8px;
}

.page-about .about-next .section-desc {
  margin-bottom: 20px;
}

.page-about .next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.page-about .about-note {
  margin-top: 20px;
  color: rgba(232, 240, 254, 0.55);
  font-size: 14px;
  line-height: 1.7;
}

/* ---- 平板与桌面 ---- */
@media (min-width: 640px) {
  .page-about .about-header {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }

  .page-about .about-header-visual {
    justify-content: flex-end;
    flex-shrink: 0;
  }

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

@media (min-width: 900px) {
  .page-about .mission-layout {
    display: grid;
    grid-template-columns: 7fr 5fr;
    gap: 24px;
    align-items: stretch;
  }

  .page-about .mission-main,
  .page-about .mission-aside {
    height: 100%;
  }

  .page-about .about-team-visual {
    max-width: 480px;
  }

  .page-about .timeline-item:nth-child(even) .timeline-card {
    margin-left: 32px;
    margin-top: 10px;
  }

  .page-about .timeline-item:nth-child(odd) .timeline-card {
    margin-left: 0;
    margin-top: 10px;
  }
}

@media (min-width: 1024px) {
  .page-about .commitments-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}