/* 品牌档案页面专属样式 */
.page-about {
  background: var(--color-surface);
  color: #2C3E50;
  overflow-x: hidden;
}
.page-about section[id] {
  scroll-margin-top: var(--header-h);
}

/* ========== Hero 横幅 ========== */
.page-about .about-hero {
  display: flex;
  flex-direction: column;
  min-height: 0;
}
.page-about .hero-side {
  position: relative;
  background: var(--color-primary-deep);
  padding: 32px 24px;
  min-height: 240px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  align-items: flex-end;
  gap: 8px;
  overflow: hidden;
}
.page-about .hero-side img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .5;
}
.page-about .hero-side::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 27, 50, .06) 0%, rgba(10, 27, 50, .72) 100%);
}
.page-about .side-label,
.page-about .side-en {
  position: relative;
  z-index: 1;
  writing-mode: vertical-rl;
}
.page-about .side-label {
  font-size: 1.75rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: .16em;
  text-shadow: 0 2px 12px rgba(10, 27, 50, .5);
}
.page-about .side-en {
  font-size: .68rem;
  color: rgba(255, 255, 255, .66);
  letter-spacing: .3em;
  text-transform: uppercase;
}
.page-about .hero-main {
  position: relative;
  padding: 40px 24px 56px;
  background: linear-gradient(135deg, #F5F8FC 0%, #E8EFF8 100%);
  overflow: hidden;
}
.page-about .hero-main::before {
  content: '';
  position: absolute;
  top: -40px;
  right: -40px;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(255, 107, 53, .18), rgba(23, 163, 111, .18));
  pointer-events: none;
}
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: .85rem;
  color: var(--color-muted);
  margin-bottom: 24px;
}
.page-about .breadcrumb a {
  color: var(--color-primary);
  text-decoration: none;
}
.page-about .breadcrumb a:hover {
  color: var(--color-accent);
}
.page-about .breadcrumb-current {
  color: #2C3E50;
}
.page-about .hero-kicker {
  display: inline-flex;
  gap: 6px;
  align-items: center;
  font-size: .8rem;
  font-weight: 700;
  color: var(--color-primary);
  background: rgba(255, 255, 255, .75);
  border: 1px solid rgba(30, 79, 138, .25);
  padding: 6px 14px;
  border-radius: 999px;
}
.page-about .hero-kicker::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
}
.page-about .hero-main h1 {
  font-size: clamp(1.75rem, 4vw, 2.9rem);
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-primary-deep);
  margin: 18px 0 0;
}
.page-about .hero-subtitle {
  margin-top: 10px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: .08em;
}
.page-about .hero-desc {
  max-width: 560px;
  margin-top: 18px;
  font-size: .95rem;
  line-height: 1.85;
  color: #3E5568;
}
.page-about .chapter-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}
.page-about .chapter-link {
  display: inline-block;
  padding: 8px 18px;
  font-size: .85rem;
  font-weight: 600;
  border-radius: 999px;
  color: var(--color-primary);
  background: rgba(255, 255, 255, .8);
  border: 1px solid rgba(30, 79, 138, .22);
  text-decoration: none;
  transition: background .3s, color .3s, border-color .3s;
}
.page-about .chapter-link:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* ========== 品牌起点 ========== */
.page-about .origin-section {
  position: relative;
  padding: 56px 0 64px;
  background: var(--color-surface);
  border-top: 1px solid var(--color-muted);
}
.page-about .origin-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 140px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-alert), transparent);
}
.page-about .origin-grid {
  display: grid;
  gap: 28px;
}
.page-about .origin-title .section-tag {
  color: var(--color-accent);
}
.page-about .origin-title h2 {
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  line-height: 1.35;
  color: var(--color-primary-deep);
  margin: 12px 0 0;
}
.page-about .origin-line {
  display: block;
  width: 56px;
  height: 4px;
  margin-top: 20px;
  border-radius: 999px;
  background: var(--color-accent);
}
.page-about .origin-body p {
  font-size: .95rem;
  line-height: 1.9;
  color: #3E5568;
  margin: 0 0 16px;
}
.page-about .origin-body p:last-child {
  margin-bottom: 0;
}

/* ========== 章节通用 ========== */
.page-about .section-tag {
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin: 0 0 10px;
}
.page-about .section-head h2 {
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  color: var(--color-primary-deep);
  margin: 0;
}
.page-about .section-lead {
  margin-top: 12px;
  color: #4A5C77;
  line-height: 1.7;
  max-width: 560px;
}

/* ========== 发展历程 ========== */
.page-about .journey-section {
  padding: 64px 0;
  background: linear-gradient(180deg, #F5F8FC 0%, #E8EFF8 100%);
}
.page-about .journey-track {
  position: relative;
  margin-top: 36px;
  padding-left: 30px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}
.page-about .journey-track::before {
  content: '';
  position: absolute;
  left: 10px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  border-radius: 999px;
  background: linear-gradient(to bottom, var(--color-primary) 0%, var(--color-accent) 60%, var(--color-success) 100%);
}
.page-about .journey-card {
  position: relative;
  z-index: 1;
  background: rgba(255, 255, 255, .9);
  border: 1px solid rgba(143, 168, 200, .28);
  border-left: 4px solid var(--color-primary);
  border-radius: 20px;
  padding: 26px 24px;
  box-shadow: 0 8px 24px rgba(143, 168, 200, .28);
  transition: box-shadow .3s, border-color .3s;
}
.page-about .journey-card:hover {
  box-shadow: 0 14px 32px rgba(30, 79, 138, .22);
  border-color: var(--color-primary);
}
.page-about .journey-card::before {
  content: '';
  position: absolute;
  left: -30px;
  top: 40px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-surface);
  border: 4px solid var(--color-accent);
  box-shadow: 0 0 0 2px rgba(255, 107, 53, .25);
}
.page-about .journey-card.is-center {
  border-left-color: var(--color-accent);
}
.page-about .version-tag {
  display: inline-block;
  font-family: var(--font-data);
  font-size: .85rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--color-primary);
  background: rgba(30, 79, 138, .1);
  border-radius: 999px;
  padding: 5px 14px;
}
.page-about .journey-card h3 {
  font-size: 1.15rem;
  color: var(--color-primary-deep);
  margin: 14px 0 10px;
}
.page-about .journey-card > p {
  font-size: .9rem;
  line-height: 1.75;
  color: #4A5C77;
  margin: 0;
}
.page-about .card-hover {
  display: block;
  margin-top: 14px;
}
.page-about .card-hover ul {
  margin: 0;
  padding-left: 18px;
  font-size: .875rem;
  line-height: 1.85;
  color: #3E5568;
}
@media (hover: hover) {
  .page-about .card-hover {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    transition: max-height .4s ease, opacity .3s ease, margin-top .3s ease;
  }
  .page-about .journey-card:hover .card-hover,
  .page-about .journey-card:focus-within .card-hover {
    max-height: 240px;
    opacity: 1;
    margin-top: 14px;
  }
}
.page-about .journey-more {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 40px;
}
.page-about .link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .9rem;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px solid rgba(30, 79, 138, .3);
  padding-bottom: 2px;
  transition: border-color .3s, color .3s;
}
.page-about .link-arrow:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* ========== 数据与内容服务体系 ========== */
.page-about .system-section {
  padding: 64px 0;
  background: var(--color-surface);
}
.page-about .system-layout {
  display: grid;
  gap: 36px;
  align-items: center;
}
.page-about .system-content h2 {
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  color: var(--color-primary-deep);
  margin: 0 0 16px;
}
.page-about .system-content > p {
  color: #4A5C77;
  line-height: 1.8;
  font-size: .95rem;
  margin-bottom: 28px;
}
.page-about .system-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .system-list li {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 14px;
  align-items: start;
  background: #fff;
  border: 1px solid rgba(184, 198, 217, .35);
  border-radius: 18px;
  padding: 18px 20px;
  box-shadow: 0 4px 14px rgba(143, 168, 200, .18);
  transition: border-color .3s;
}
.page-about .system-list li:hover {
  border-color: var(--color-accent);
}
.page-about .list-num {
  font-family: var(--font-data);
  font-size: .9rem;
  font-weight: 700;
  color: var(--color-accent);
  padding-top: 2px;
}
.page-about .system-list strong {
  display: block;
  color: var(--color-primary-deep);
  font-size: .98rem;
}
.page-about .system-list p {
  margin: 5px 0 0;
  font-size: .875rem;
  line-height: 1.7;
  color: #4A5C77;
}
.page-about .system-media img {
  width: 100%;
  height: auto;
  border-radius: 24px;
  box-shadow: var(--shadow-card);
  object-fit: cover;
}
.page-about .system-more {
  margin-top: 32px;
}

/* ========== 服务范围 ========== */
.page-about .coverage-section {
  background: var(--color-surface);
  padding-top: 0;
}
.page-about .coverage-banner {
  position: relative;
  height: 220px;
  overflow: hidden;
}
.page-about .coverage-banner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}
.page-about .coverage-banner::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(245, 248, 252, 0) 40%, rgba(245, 248, 252, .2) 100%);
}
.page-about .coverage-panel {
  position: relative;
  z-index: 2;
  margin-top: -40px;
  border-radius: 28px 28px 0 0;
  padding: 48px 0 60px;
  background:
    radial-gradient(ellipse 120% 60% at 80% 0%, rgba(255, 255, 255, .08) 0%, transparent 70%),
    linear-gradient(160deg, var(--color-primary-deep) 0%, var(--color-primary) 100%);
  color: #fff;
}
.page-about .coverage-panel .section-tag {
  color: var(--color-accent);
}
.page-about .coverage-panel h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  color: #fff;
  margin: 0 0 12px;
}
.page-about .coverage-lead {
  color: rgba(255, 255, 255, .78);
  font-size: .95rem;
  line-height: 1.7;
  max-width: 560px;
}
.page-about .coverage-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin: 32px 0;
}
.page-about .stat-cell {
  background: rgba(255, 255, 255, .08);
  border: 1px solid rgba(255, 255, 255, .14);
  border-radius: 18px;
  padding: 20px 16px;
}
.page-about .stat-num {
  display: block;
  font-family: var(--font-data);
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
}
.page-about .stat-label {
  display: block;
  margin-top: 10px;
  font-size: .8rem;
  color: rgba(255, 255, 255, .75);
}
.page-about .coverage-grid {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}
.page-about .coverage-item {
  background: rgba(255, 255, 255, .07);
  border: 1px solid rgba(255, 255, 255, .12);
  border-radius: 18px;
  padding: 20px 22px;
  transition: background .3s;
}
.page-about .coverage-item:hover {
  background: rgba(255, 255, 255, .11);
}
.page-about .coverage-item h3 {
  font-size: .95rem;
  color: #fff;
  margin: 0 0 8px;
}
.page-about .coverage-item p {
  font-size: .875rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, .82);
  margin: 0;
}
.page-about .coverage-cats {
  margin-top: 32px;
  background: rgba(255, 255, 255, .07);
  border: 1px solid rgba(255, 255, 255, .1);
  border-radius: 20px;
  padding: 8px 20px;
}
.page-about .cat-item {
  border-bottom: 1px solid rgba(255, 255, 255, .1);
}
.page-about .cat-item:last-child {
  border-bottom: none;
}
.page-about .cat-item summary {
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 0;
  font-size: .95rem;
  font-weight: 600;
  color: #fff;
  cursor: pointer;
  transition: color .3s;
}
.page-about .cat-item summary::-webkit-details-marker {
  display: none;
}
.page-about .cat-item:hover summary {
  color: var(--color-accent);
}
.page-about .cat-item summary::after {
  content: '+';
  font-family: var(--font-data);
  font-size: 1.3rem;
  line-height: 1;
  color: var(--color-accent);
  transition: transform .3s;
}
.page-about .cat-item[open] summary::after {
  content: '−';
}
.page-about .cat-item p {
  margin: 0 0 16px;
  font-size: .875rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, .82);
}

/* ========== 团队与运营 ========== */
.page-about .team-section {
  padding: 64px 0;
  background: var(--color-surface);
}
.page-about .team-grid {
  display: grid;
  gap: 18px;
  margin-top: 32px;
}
.page-about .team-card {
  background: #fff;
  border: 1px solid rgba(184, 198, 217, .3);
  border-top: 3px solid var(--color-primary);
  border-radius: 20px;
  padding: 26px 24px;
  box-shadow: var(--shadow-card);
  transition: transform .3s, box-shadow .3s;
}
.page-about .team-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 16px 36px rgba(30, 79, 138, .2);
}
.page-about .team-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: 18px;
  margin-bottom: 18px;
  color: #fff;
  background: var(--color-primary);
}
.page-about .team-icon-op {
  background: var(--color-accent);
}
.page-about .team-icon-dev {
  background: var(--color-success);
}
.page-about .team-card h3 {
  font-size: 1.1rem;
  color: var(--color-primary-deep);
  margin: 0 0 10px;
}
.page-about .team-card p {
  font-size: .9rem;
  line-height: 1.75;
  color: #4A5C77;
  margin: 0;
}

/* ========== 我们的承诺 ========== */
.page-about .pledge-section {
  padding: 32px 0 72px;
  background: linear-gradient(180deg, var(--color-surface) 0%, #E8EFF8 100%);
}
.page-about .pledge-card {
  position: relative;
  text-align: center;
  background: rgba(255, 255, 255, .95);
  border: 1px solid rgba(184, 198, 217, .35);
  border-radius: 28px;
  padding: 48px 24px 40px;
  box-shadow: 0 14px 40px rgba(143, 168, 200, .3);
  overflow: hidden;
}
.page-about .pledge-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 55%, var(--color-success) 100%);
}
.page-about .pledge-card .section-tag {
  color: var(--color-accent);
}
.page-about .pledge-card h2 {
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  color: var(--color-primary-deep);
  margin: 0;
}
.page-about .pledge-text {
  max-width: 620px;
  margin: 16px auto 0;
  font-size: .95rem;
  line-height: 1.85;
  color: #3E5568;
}
.page-about .pledge-line {
  display: block;
  width: 56px;
  height: 3px;
  margin: 24px auto;
  border-radius: 999px;
  background: var(--color-accent);
}
.page-about .pledge-contact {
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: center;
  margin-bottom: 28px;
}
.page-about .pledge-label {
  display: block;
  font-size: .78rem;
  color: var(--color-muted);
  letter-spacing: .04em;
}
.page-about .pledge-value {
  font-family: var(--font-data);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
}
.page-about .pledge-icp {
  margin-top: 26px;
  font-size: .8rem;
  color: var(--color-muted);
}

/* ========== 桌面端响应 ========== */
@media (min-width: 860px) {
  .page-about .about-hero {
    flex-direction: row;
    min-height: 520px;
  }
  .page-about .hero-side {
    flex: 0 0 36%;
    min-height: 520px;
    padding: 48px 32px;
  }
  .page-about .hero-main {
    flex: 1;
    padding: 64px 56px;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
  .page-about .side-label {
    font-size: 2.1rem;
  }
  .page-about .hero-main h1 {
    font-size: clamp(2rem, 3.6vw, 3.1rem);
  }
  .page-about .origin-grid {
    grid-template-columns: 42% 58%;
    gap: 40px;
    align-items: start;
  }
  .page-about .origin-title {
    position: sticky;
    top: calc(var(--header-h) + 16px);
  }
  .page-about .journey-track {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    padding: 72px 0 28px;
    margin-top: 48px;
  }
  .page-about .journey-track::before {
    left: 10%;
    right: 10%;
    top: 8px;
    bottom: auto;
    width: auto;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 55%, var(--color-success) 100%);
  }
  .page-about .journey-card {
    margin: 0;
    border-left-width: 1px;
    border-top: 4px solid var(--color-primary);
  }
  .page-about .journey-card.is-center {
    border-top-color: var(--color-accent);
  }
  .page-about .journey-card::before {
    left: 50%;
    top: -56px;
    transform: translateX(-50%);
  }
  .page-about .system-layout {
    grid-template-columns: 1.1fr .9fr;
    gap: 48px;
  }
  .page-about .system-media img {
    border-radius: 28px;
  }
  .page-about .coverage-banner {
    height: 320px;
  }
  .page-about .coverage-panel {
    margin-top: -56px;
  }
  .page-about .coverage-stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
  }
  .page-about .stat-num {
    font-size: 2rem;
  }
  .page-about .coverage-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  .page-about .team-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
  .page-about .team-card {
    padding: 32px 28px;
  }
  .page-about .pledge-section {
    padding: 40px 0 88px;
  }
  .page-about .pledge-card {
    padding: 56px 48px 48px;
  }
  .page-about .pledge-contact {
    flex-direction: row;
    justify-content: center;
    gap: 40px;
  }
}

@media (min-width: 1200px) {
  .page-about .hero-main {
    padding: 72px 64px;
  }
  .page-about .hero-side {
    padding: 56px 40px;
  }
  .page-about .system-layout {
    gap: 64px;
  }
}