/* ===== page-about 专属样式 ===== */
.page-about {
  --about-bg: var(--bg);
  --about-elevated: var(--bg-elevated);
  --about-gold: var(--gold);
  --about-gold-soft: var(--gold-soft);
  --about-crimson: var(--crimson);
  --about-text: var(--text-main);
  --about-sub: var(--text-sub);
  --about-line: var(--line);
  --about-shadow: var(--shadow-soft);
  --about-radius: var(--radius);
  position: relative;
  overflow: hidden;
  background: var(--about-bg);
  color: var(--about-text);
  font-family: var(--font-body);
  line-height: 1.7;
}

/* 背景山水线条 */
.page-about__decor {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.85;
}
.page-about__decor-svg {
  position: absolute;
  top: 120px;
  left: 0;
  width: 100%;
  height: 320px;
  object-fit: cover;
}
.page-about > *:not(.page-about__decor) {
  position: relative;
  z-index: 1;
}

/* 面包屑 */
.page-about .breadcrumb {
  max-width: var(--container);
  margin: 0 auto;
  padding: 24px 24px 0;
  font-size: 0.875rem;
  color: var(--about-sub);
  letter-spacing: 0.02em;
}
.page-about .breadcrumb a {
  color: var(--about-gold);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--about-gold-soft);
  border-bottom-color: var(--about-gold-soft);
}
.page-about .breadcrumb span[aria-current="page"] {
  color: var(--about-text);
}

/* ===== 首屏区 ===== */
.page-about__intro {
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(56px, 9vw, 120px) 24px 48px;
  display: flex;
  flex-direction: column;
  gap: 28px;
  border-bottom: 1px solid var(--about-line);
}
.page-about__intro-aside {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.page-about .section__index {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--about-gold);
  font-weight: 600;
}
.page-about .section__index::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--about-gold);
  display: inline-block;
}
.page-about .lede {
  color: var(--about-gold-soft);
  font-size: 0.9375rem;
  letter-spacing: 0.08em;
  max-width: 380px;
}
.page-about__intro-main h1 {
  font-family: var(--font-heading);
  font-size: clamp(2.6rem, 6vw, 4.6rem);
  line-height: 1.05;
  margin: 0 0 20px;
  letter-spacing: 0.01em;
  font-weight: 400;
  color: var(--about-text);
}
.page-about__intro-lead {
  font-size: 1.0625rem;
  color: var(--about-sub);
  max-width: 520px;
  margin-bottom: 28px;
}
.page-about__intro-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about__intro-meta span {
  font-size: 0.8125rem;
  color: var(--about-sub);
  border: 1px solid var(--about-line);
  border-radius: 999px;
  padding: 6px 14px;
  background: rgba(16, 27, 58, 0.45);
}

/* ===== 通用章节网格 ===== */
.page-about__section {
  max-width: var(--container);
  margin: 0 auto;
  padding: 64px 24px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  border-bottom: 1px solid var(--about-line);
}
.page-about .section-grid__aside {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.page-about .section-grid__aside h2,
.page-about .section-grid__content h2 {
  font-family: var(--font-heading);
  font-weight: 400;
  line-height: 1.2;
  margin: 0;
  font-size: clamp(1.6rem, 2.6vw, 2.3rem);
  color: var(--about-text);
}
.page-about__aside-note {
  color: var(--about-sub);
  font-size: 0.9375rem;
  line-height: 1.8;
  max-width: 420px;
}
.page-about__aside-link {
  color: var(--about-gold);
  text-decoration: none;
  font-size: 0.875rem;
  border-bottom: 1px solid transparent;
  align-self: flex-start;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.page-about__aside-link:hover,
.page-about__aside-link:focus-visible {
  color: var(--about-gold-soft);
  border-bottom-color: var(--about-gold-soft);
}
.page-about .section-grid__content {
  min-width: 0;
}

/* ===== 品牌故事与时间线 ===== */
.page-about__story-intro {
  max-width: 640px;
  margin-bottom: 28px;
}
.page-about__story-intro p {
  color: var(--about-sub);
  font-size: 1.0625rem;
  line-height: 1.9;
}
.page-about__story-figure {
  margin: 28px 0 36px;
  background: var(--about-elevated);
  border-radius: var(--about-radius);
}
.page-about__story-figure img {
  width: 100%;
  height: auto;
  display: block;
}
.page-about__story-figure figcaption {
  padding: 12px 16px;
  font-size: 0.8125rem;
  color: var(--about-sub);
  border-top: 1px solid var(--about-line);
}

/* 时间线 */
.page-about__timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.page-about__timeline-item {
  position: relative;
  padding: 0 0 36px 34px;
  border-left: 1px solid var(--about-line);
  transition: border-color 0.3s ease;
}
.page-about__timeline-item:last-child {
  padding-bottom: 8px;
  border-left-color: transparent;
}
.page-about__timeline-item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 4px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--about-gold);
  border: 3px solid var(--about-bg);
  box-shadow: 0 0 0 1px var(--about-gold), 0 0 12px rgba(201, 162, 39, 0.55);
}
.page-about__timeline-item[data-revealed="true"] {
  border-left-color: rgba(201, 162, 39, 0.6);
}
.page-about__timeline-item[data-revealed="true"]::before {
  background: var(--about-gold-soft);
  box-shadow: 0 0 0 1px var(--about-gold-soft), 0 0 18px rgba(224, 196, 111, 0.8);
}
.page-about__timeline-index {
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-heading);
  font-size: 0.875rem;
  color: var(--about-gold);
  letter-spacing: 0.08em;
}
.page-about__timeline-body h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 400;
  margin: 0 0 6px 44px;
  color: var(--about-text);
}
.page-about__timeline-body p {
  margin: 0 0 0 44px;
  color: var(--about-sub);
  font-size: 0.9375rem;
  line-height: 1.8;
}

/* ===== 官方认证体系 ===== */
.page-about__cert {
  background:
    radial-gradient(ellipse at 80% 20%, rgba(201, 162, 39, 0.08), transparent 50%),
    var(--about-bg);
}
.page-about__cert-layout {
  display: flex;
  flex-direction: column;
  gap: 36px;
}
.page-about__cert-promo {
  display: flex;
  flex-direction: column;
  gap: 20px;
  align-items: flex-start;
  padding: 28px;
  background: rgba(16, 27, 58, 0.72);
  border: 1px solid var(--about-line);
  border-radius: var(--about-radius);
  box-shadow: 0 16px 40px var(--about-shadow);
}
.page-about__cert-badge {
  width: 120px;
  height: 120px;
  flex-shrink: 0;
}
.page-about__cert-badge svg {
  width: 100%;
  height: 100%;
  display: block;
}
.page-about__cert-copy p {
  margin: 0 0 12px;
  color: var(--about-sub);
  font-size: 1rem;
  line-height: 1.9;
}
.page-about__cert-trust {
  font-size: 0.9375rem !important;
  color: var(--about-gold-soft) !important;
  border-left: 2px solid var(--about-gold);
  padding-left: 14px;
}
.page-about__cert-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: center;
}
.page-about__cert-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}
.page-about__cert-list li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px;
  background: rgba(16, 27, 58, 0.5);
  border: 1px solid transparent;
  transition: border-color 0.25s ease, background 0.25s ease;
}
.page-about__cert-list li:hover,
.page-about__cert-list li:focus-within {
  border-color: rgba(201, 162, 39, 0.45);
  background: rgba(16, 27, 58, 0.85);
}
.page-about__cert-item-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--about-gold);
  color: var(--about-bg);
  font-size: 0.8125rem;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 2px;
}
.page-about__cert-list h3 {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 400;
  margin: 0 0 4px;
  color: var(--about-text);
}
.page-about__cert-list p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--about-sub);
  line-height: 1.7;
}
.page-about__cert-figure {
  margin: 0;
  background: var(--about-elevated);
  border-radius: var(--about-radius);
  overflow: hidden;
}
.page-about__cert-figure img {
  width: 100%;
  height: auto;
  display: block;
}

/* ===== 全球服务网络 ===== */
.page-about__network {
  background: linear-gradient(180deg, rgba(16, 27, 58, 0.4), transparent 40%);
}
.page-about__network-figure {
  position: relative;
  margin: 0 0 32px;
  border-radius: var(--about-radius);
  overflow: hidden;
  border: 1px solid var(--about-line);
  background: var(--about-elevated);
}
.page-about__network-figure img {
  width: 100%;
  height: auto;
  display: block;
}
/* 地图定位点 */
.page-about__pin {
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--about-gold);
  color: #0A1128;
  font-weight: 700;
  font-size: 0.8125rem;
  box-shadow: 0 0 0 6px rgba(201, 162, 39, 0.2), 0 6px 18px rgba(0, 0, 0, 0.5);
  cursor: default;
  transition: transform 0.2s ease, background 0.2s ease;
}
.page-about__pin:hover,
.page-about__pin:focus-visible {
  transform: scale(1.15);
  background: var(--about-gold-soft);
}
.page-about__pin--asia {
  top: 32%;
  left: 56%;
}
.page-about__pin--europe {
  top: 22%;
  left: 36%;
}
.page-about__pin--pacific {
  top: 38%;
  left: 74%;
}
.page-about__pin-num {
  line-height: 1;
  font-family: var(--font-heading);
}
.page-about__pin-tip {
  position: absolute;
  bottom: calc(100% + 14px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--about-elevated);
  border: 1px solid var(--about-gold);
  border-radius: var(--about-radius);
  padding: 8px 12px;
  font-size: 0.8125rem;
  color: var(--about-text);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  box-shadow: 0 8px 24px var(--about-shadow);
  z-index: 3;
}
.page-about__pin:hover .page-about__pin-tip,
.page-about__pin:focus-visible .page-about__pin-tip {
  opacity: 1;
  transform: translateX(-50%) translateY(-3px);
}

/* 服务数据卡 */
.page-about__network-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.page-about__network-card {
  background: rgba(16, 27, 58, 0.82);
  border: 1px solid var(--about-line);
  border-top: 2px solid var(--about-gold);
  border-radius: var(--about-radius);
  padding: 22px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.25);
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.page-about__network-card:hover,
.page-about__network-card:focus-within {
  border-color: rgba(201, 162, 39, 0.55);
  transform: translateY(-2px);
}
.page-about__stat-num {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 2.9rem);
  line-height: 1.05;
  color: var(--about-gold);
  display: block;
}
.page-about__stat-label {
  font-size: 0.875rem;
  color: var(--about-sub);
}

/* ===== 版本演进历程 ===== */
.page-about__version {
  background: radial-gradient(ellipse at 10% 90%, rgba(178, 34, 34, 0.08), transparent 45%);
}
.page-about__version-lead {
  max-width: 660px;
  color: var(--about-sub);
  font-size: 1.0625rem;
  line-height: 1.9;
  margin-bottom: 28px;
}
.page-about__version-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-bottom: 28px;
}
.page-about__version-card {
  background: rgba(16, 27, 58, 0.7);
  border: 1px solid var(--about-line);
  border-radius: var(--about-radius);
  padding: 28px 26px;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.page-about__version-card:hover,
.page-about__version-card:focus-within {
  border-color: rgba(201, 162, 39, 0.5);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.35);
}
.page-about__version-card h3 {
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 400;
  margin: 14px 0 10px;
  color: var(--about-text);
}
.page-about__version-card p {
  margin: 0;
  color: var(--about-sub);
  font-size: 0.9375rem;
  line-height: 1.8;
}
.page-about .index-tag {
  display: inline-block;
  background: rgba(201, 162, 39, 0.16);
  color: var(--about-gold-soft);
  border: 1px solid rgba(201, 162, 39, 0.4);
  border-radius: 999px;
  padding: 4px 14px;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
}
.page-about__version-notice {
  margin-bottom: 32px;
}
.page-about .notice {
  background: rgba(201, 162, 39, 0.12);
  border: 1px solid rgba(201, 162, 39, 0.42);
  color: var(--about-text);
  padding: 18px 22px;
  font-size: 0.9375rem;
  line-height: 1.8;
  border-radius: var(--about-radius);
}
.page-about .notice p {
  margin: 0;
}
.page-about__version-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* 按钮 */
.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--about-radius);
  padding: 13px 26px;
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.25s ease, border-color 0.25s ease, color 0.25s ease, transform 0.2s ease;
  border: 1px solid transparent;
}
.page-about .btn--primary {
  background: var(--about-gold);
  color: #0A1128;
  border-color: var(--about-gold);
}
.page-about .btn--primary:hover,
.page-about .btn--primary:focus-visible {
  background: var(--about-gold-soft);
  border-color: var(--about-gold-soft);
  transform: translateY(-2px);
}
.page-about .btn--ghost {
  background: transparent;
  color: var(--about-gold);
  border-color: rgba(201, 162, 39, 0.6);
}
.page-about .btn--ghost:hover,
.page-about .btn--ghost:focus-visible {
  color: var(--about-gold-soft);
  border-color: var(--about-gold-soft);
  background: rgba(201, 162, 39, 0.1);
  transform: translateY(-2px);
}

/* ===== 收束区域 ===== */
.page-about__closing {
  max-width: var(--container);
  margin: 0 auto;
  padding: 72px 24px 88px;
}
.page-about__closing-inner {
  display: flex;
  flex-direction: column;
  gap: 28px;
  align-items: flex-start;
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--about-crimson);
  background: linear-gradient(135deg, rgba(16, 27, 58, 0.9), rgba(10, 17, 40, 0.95));
  padding: 36px 30px;
  border-radius: var(--about-radius);
  box-shadow: 0 20px 60px var(--about-shadow);
}
.page-about__closing-mark {
  font-family: var(--font-heading);
  font-size: clamp(2.4rem, 6vw, 4rem);
  color: var(--about-gold);
  opacity: 0.35;
  line-height: 1;
  letter-spacing: 0.04em;
}
.page-about__closing-copy h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  font-weight: 400;
  margin: 0 0 12px;
  color: var(--about-text);
}
.page-about__closing-copy p {
  color: var(--about-sub);
  font-size: 1rem;
  line-height: 1.85;
  max-width: 560px;
  margin: 0 0 20px;
}
.page-about__closing-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}
.page-about__closing-links a {
  color: var(--about-gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 162, 39, 0.4);
  font-size: 0.9375rem;
  padding-bottom: 2px;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.page-about__closing-links a:hover,
.page-about__closing-links a:focus-visible {
  color: var(--about-gold-soft);
  border-bottom-color: var(--about-gold-soft);
}

/* ===== 滚动显现（渐进增强） ===== */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.page-about [data-reveal][data-revealed="true"] {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .page-about__timeline-item,
  .page-about__timeline-item::before,
  .page-about__timeline-item[data-revealed="true"] {
    transition: none;
  }
  .page-about .btn,
  .page-about__pin,
  .page-about__version-card,
  .page-about__network-card {
    transition: none;
    transform: none;
  }
}

/* ===== 桌面端响应式 ===== */
@media (min-width: 768px) {
  .page-about__intro {
    display: grid;
    grid-template-columns: minmax(200px, 0.8fr) minmax(0, 2.2fr);
    gap: 48px;
    align-items: start;
  }
  .page-about__intro-main {
    padding-top: 8px;
  }
  .page-about__section {
    grid-template-columns: minmax(220px, 0.75fr) minmax(0, 2.25fr);
    gap: clamp(36px, 6vw, 88px);
    padding: 88px 24px;
  }
  .page-about__cert-promo {
    flex-direction: row;
    align-items: center;
    gap: 32px;
  }
  .page-about__cert-grid {
    grid-template-columns: 1fr 280px;
    gap: 36px;
    align-items: stretch;
  }
  .page-about__cert-figure {
    margin: 0;
  }
  .page-about__network-stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
  }
  .page-about__version-row {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
  .page-about__closing-inner {
    flex-direction: row;
    align-items: center;
    padding: 48px 44px;
  }
  .page-about__closing-mark {
    opacity: 0.5;
  }
}

@media (min-width: 1100px) {
  .page-about__section {
    gap: clamp(48px, 8vw, 120px);
  }
}