/* ===== 页面专属 CSS：.page-about ===== */
.page-about {
  --about-hero-bg: var(--color-primary, #0044CC);
  --about-hero-accent: var(--color-secondary, #FF6600);
  --about-speed-color: var(--color-accent, #00FF88);
  --about-card-radius: var(--radius-card, 8px);
  --about-shadow: var(--shadow-card, 0 4px 16px rgba(0,0,0,0.08));
  --about-font-head: var(--font-head-weight, 900);
  --about-font-body: var(--font-body-weight, 400);
  --about-transition: var(--transition-med, 0.35s ease);
  /* 移动端基础值 */
  --about-hero-left-flex: 1 1 100%;
  --about-hero-right-flex: 1 1 100%;
}

/* ---------- 首屏错位色块 ---------- */
.page-about .about-hero {
  display: flex;
  flex-wrap: wrap;
  min-height: 480px;
  margin: 0;
  position: relative;
  background: var(--color-primary, #0044CC);          /* 左上蓝 */
  clip-path: polygon(0 0, 100% 0, 100% 72%, 0 88%);
}
.page-about .about-hero-left {
  flex: var(--about-hero-left-flex);
  padding: 40px 24px 60px;
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: center;
  color: var(--color-white, #FFFFFF);
}
.page-about .about-hero-right {
  flex: var(--about-hero-right-flex);
  background: var(--color-white, #FFFFFF);             /* 右下白 */
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px 20px;
  min-height: 320px;
}
/* 桌面分屏：左2/3 右1/3 */
@media (min-width: 768px) {
  .page-about .about-hero {
    flex-wrap: nowrap;
    clip-path: polygon(0 0, 66% 0, 66% 100%, 0 100%);
    min-height: 520px;
  }
  .page-about .about-hero-left {
    flex: 0 0 66%;
    padding: 60px 48px 80px;
  }
  .page-about .about-hero-right {
    flex: 0 0 34%;
    padding: 40px 28px;
    min-height: auto;
    background: linear-gradient(135deg, var(--color-white, #FFFFFF) 60%, var(--color-neutral-light, #F2F2F2) 100%);
  }
}
@media (min-width: 1200px) {
  .page-about .about-hero {
    min-height: 600px;
  }
  .page-about .about-hero-left {
    padding: 80px 64px 100px;
  }
  .page-about .about-hero-right {
    padding: 48px 36px;
  }
}

.page-about .about-hero-title {
  font-size: 48px;
  line-height: 1.1;
  font-weight: var(--about-font-head);
  margin: 0 0 8px;
  letter-spacing: -0.02em;
  color: var(--color-white, #FFFFFF);
  position: relative;
  z-index: 3;
}
@media (min-width: 768px) {
  .page-about .about-hero-title {
    font-size: 64px;
  }
}
@media (min-width: 1200px) {
  .page-about .about-hero-title {
    font-size: 80px;
  }
}

.page-about .about-hero-annotation {
  display: inline-block;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-size: 14px;
  font-weight: var(--about-font-body);
  letter-spacing: 0.1em;
  color: var(--color-accent, #00FF88);
  margin-left: 8px;
  padding: 4px 2px;
  background: rgba(0,0,0,0.25);
  border-radius: 2px;
  position: absolute;
  top: 24px;
  right: 16px;
  z-index: 4;
}
@media (min-width: 768px) {
  .page-about .about-hero-annotation {
    right: 24px;
    top: 32px;
    font-size: 16px;
  }
}

.page-about .about-hero-speedlines {
  margin: 16px 0 20px;
  position: relative;
  z-index: 3;
}
.page-about .about-hero-speedlines svg {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about .about-hero-desc {
  max-width: 520px;
  font-size: 16px;
  line-height: 1.6;
  font-weight: var(--about-font-body);
  color: rgba(255,255,255,0.92);
  margin: 0 0 20px;
  position: relative;
  z-index: 3;
}
@media (min-width: 768px) {
  .page-about .about-hero-desc {
    font-size: 18px;
  }
}

.page-about .about-hero-bg-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.18;
  z-index: 1;
  pointer-events: none;
}

.page-about .about-device-img {
  max-width: 180px;
  height: auto;
  object-fit: contain;
  margin-bottom: 16px;
  filter: drop-shadow(0 8px 24px rgba(0,0,0,0.12));
}
@media (min-width: 768px) {
  .page-about .about-device-img {
    max-width: 220px;
  }
}

.page-about .about-hero-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--color-neutral-light, #F2F2F2);
  border-radius: var(--about-card-radius);
  padding: 12px 20px;
  box-shadow: var(--about-shadow);
  clip-path: polygon(0 4px, 100% 0, 100% calc(100% - 4px), 0 100%);
}
.page-about .about-hero-card-label {
  font-size: 12px;
  text-transform: uppercase;
  color: var(--color-primary, #0044CC);
  font-weight: 600;
  letter-spacing: 0.05em;
}
.page-about .about-hero-card-value {
  font-size: 20px;
  font-weight: var(--about-font-head);
  color: var(--color-secondary, #FF6600);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding: 16px 24px 0;
  max-width: var(--container-max, 1200px);
  margin: 0 auto;
  font-size: 14px;
}
.page-about .breadcrumb-link {
  color: var(--color-primary, #0044CC);
  text-decoration: none;
  transition: color var(--transition-fast, 0.2s ease);
}
.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus {
  color: var(--color-secondary, #FF6600);
  text-decoration: underline;
}
.page-about .breadcrumb-sep {
  margin: 0 6px;
  color: var(--color-neutral-dark, #1A1A1A);
}
.page-about .breadcrumb-current {
  font-weight: 600;
  color: var(--color-neutral-dark, #1A1A1A);
}

/* ---------- 通用 section 容器 ---------- */
.page-about .section {
  padding: 48px 0;
}
@media (min-width: 768px) {
  .page-about .section {
    padding: 64px 0;
  }
}
.page-about .section-heading {
  font-size: 32px;
  font-weight: var(--about-font-head);
  margin: 0 0 28px;
  position: relative;
  display: inline-block;
  color: var(--color-primary-dark, #002266);
}
.page-about .section-heading::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 48px;
  height: 4px;
  background: var(--color-secondary, #FF6600);
  clip-path: polygon(0 0, 100% 0, 90% 100%, 0 100%);
}
@media (min-width: 768px) {
  .page-about .section-heading {
    font-size: 40px;
  }
}

/* ---------- 我们的使命 ---------- */
.page-about .about-mission-layout {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
}
.page-about .about-mission-text {
  flex: 1 1 60%;
}
.page-about .about-mission-visual {
  flex: 1 1 30%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-about .about-mission-body {
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-neutral-dark, #1A1A1A);
  margin: 0 0 16px;
}
.page-about .about-mission-img {
  max-width: 100%;
  height: auto;
  border-radius: var(--about-card-radius);
  box-shadow: var(--about-shadow);
  clip-path: polygon(0 6px, 100% 0, 100% calc(100% - 6px), 0 100%);
}

/* ---------- 核心功能概览 ---------- */
.page-about .about-features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
@media (min-width: 600px) {
  .page-about .about-features-grid {
    grid-template-columns: 1fr 1fr;
  }
}
@media (min-width: 1200px) {
  .page-about .about-features-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.page-about .about-feature-card {
  padding: 24px 20px;
  background: var(--color-white, #FFFFFF);
  border-radius: var(--about-card-radius);
  box-shadow: var(--about-shadow);
  transition: transform var(--about-transition), box-shadow var(--about-transition);
  clip-path: polygon(0 6px, 100% 0, 100% calc(100% - 6px), 0 100%);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.page-about .about-feature-card:hover,
.page-about .about-feature-card:focus-within {
  transform: translateY(-4px) scale(1.02);
  box-shadow: 0 8px 28px rgba(0,68,204,0.15);
}
.page-about .about-feature-icon-wrap {
  margin-bottom: 12px;
  background: var(--color-neutral-light, #F2F2F2);
  padding: 10px;
  border-radius: 6px;
}
.page-about .about-feature-title {
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--color-primary-dark, #002266);
}
.page-about .about-feature-desc {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-neutral-dark, #1A1A1A);
  margin: 0;
}

/* ---------- 为什么选择我们 ---------- */
.page-about .about-why-layout {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
}
.page-about .about-why-left {
  flex: 1 1 60%;
}
.page-about .about-why-right {
  flex: 1 1 30%;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.page-about .about-why-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.page-about .about-why-item {
  padding: 16px 20px;
  background: var(--color-white, #FFFFFF);
  border-radius: var(--about-card-radius);
  box-shadow: var(--about-shadow);
  clip-path: polygon(0 4px, 100% 0, 100% calc(100% - 4px), 0 100%);
  cursor: pointer;
  transition: box-shadow var(--about-transition);
}
.page-about .about-why-item:hover {
  box-shadow: 0 6px 20px rgba(0,68,204,0.10);
}
.page-about .about-why-item-header {
  display: flex;
  align-items: center;
  gap: 12px;
}
.page-about .about-why-num {
  font-size: 14px;
  font-weight: 800;
  color: var(--color-accent, #00FF88);
  background: var(--color-primary, #0044CC);
  padding: 2px 10px;
  border-radius: 4px;
  line-height: 1.4;
}
.page-about .about-why-item-title {
  font-size: 18px;
  font-weight: 700;
  margin: 0;
  flex: 1;
  color: var(--color-primary-dark, #002266);
}
.page-about .about-why-toggle {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-secondary, #FF6600);
  transition: transform var(--about-transition);
}
.page-about .about-why-item[data-expandable] .about-why-item-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--about-transition), padding var(--about-transition);
  padding-top: 0;
  padding-bottom: 0;
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-neutral-dark, #1A1A1A);
}
.page-about .about-why-item[data-expandable].is-open .about-why-item-body {
  max-height: 300px;
  padding-top: 12px;
  padding-bottom: 4px;
}
.page-about .about-why-item[data-expandable].is-open .about-why-toggle {
  transform: rotate(45deg);
}

.page-about .about-why-stats {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.page-about .about-why-stat {
  background: var(--color-neutral-light, #F2F2F2);
  padding: 16px 20px;
  border-radius: var(--about-card-radius);
  clip-path: polygon(0 4px, 100% 0, 100% calc(100% - 4px), 0 100%);
}
.page-about .about-why-stat-num {
  display: block;
  font-size: 32px;
  font-weight: var(--about-font-head);
  color: var(--color-primary, #0044CC);
  line-height: 1.2;
}
.page-about .about-why-stat-label {
  display: block;
  font-size: 14px;
  color: var(--color-neutral-dark, #1A1A1A);
  margin: 4px 0 8px;
}
.page-about .progress-bar {
  height: 6px;
  background: var(--color-white, #FFFFFF);
  border-radius: 3px;
  overflow: hidden;
}
.page-about .progress-fill {
  display: block;
  height: 100%;
  background: var(--color-accent, #00FF88);
  border-radius: 3px;
  transition: width 1s ease;
}

/* ---------- 联系方式与服务承诺 ---------- */
.page-about .about-contact {
  background: var(--color-neutral-light, #F2F2F2);
}
.page-about .about-contact-inner {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}
.page-about .about-contact-desc {
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-neutral-dark, #1A1A1A);
  margin: 0 0 28px;
}
.page-about .about-contact-details {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px 40px;
  margin-bottom: 32px;
}
.page-about .about-contact-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.page-about .about-contact-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary, #0044CC);
}
.page-about .about-contact-value {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary-dark, #002266);
}
.page-about .about-contact-cta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-bottom: 24px;
}
.page-about .about-contact-trust {
  font-size: 13px;
  line-height: 1.6;
  color: #666;
  border-top: 2px solid var(--color-accent, #00FF88);
  padding-top: 16px;
  max-width: 600px;
  margin: 0 auto;
  border-image: linear-gradient(to right, transparent, var(--color-accent, #00FF88), transparent) 1;
}

/* ---------- 站内链接导航栏 ---------- */
.page-about .about-internal-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  padding: 24px 16px 40px;
  max-width: var(--container-max, 1200px);
  margin: 0 auto;
}
.page-about .about-internal-nav .btn {
  text-decoration: none;
}

/* ---------- 按钮复用 ---------- */
.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  border-radius: 4px;
  font-weight: 600;
  font-size: 14px;
  line-height: 1.4;
  transition: transform var(--transition-fast, 0.2s ease), box-shadow var(--transition-fast, 0.2s ease);
  border: none;
  cursor: pointer;
  clip-path: polygon(0 2px, 100% 0, 100% calc(100% - 2px), 0 100%);
}
.page-about .btn:hover,
.page-about .btn:focus {
  transform: scale(1.05);
}
.page-about .btn-primary {
  background: var(--color-primary, #0044CC);
  color: var(--color-white, #FFFFFF);
}
.page-about .btn-secondary {
  background: var(--color-secondary, #FF6600);
  color: var(--color-white, #FFFFFF);
}
.page-about .btn-sm {
  padding: 6px 16px;
  font-size: 13px;
}

/* ---------- 响应式微调 ---------- */
@media (max-width: 599px) {
  .page-about .about-hero-title {
    font-size: 36px;
  }
  .page-about .about-hero-desc {
    font-size: 14px;
  }
  .page-about .about-mission-text {
    flex: 1 1 100%;
  }
  .page-about .about-mission-visual {
    flex: 1 1 100%;
  }
  .page-about .about-why-left {
    flex: 1 1 100%;
  }
  .page-about .about-why-right {
    flex: 1 1 100%;
  }
  .page-about .section-heading {
    font-size: 26px;
  }
  .page-about .about-contact-value {
    font-size: 15px;
  }
}

/* ---------- 滚动动画触发器（渐进增强） ---------- */
.page-about .about-feature-card,
.page-about .about-why-item,
.page-about .about-why-stat {
  opacity: 0;
  transform: translateY(20px) rotate(0.5deg);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.page-about .about-feature-card.visible,
.page-about .about-why-item.visible,
.page-about .about-why-stat.visible {
  opacity: 1;
  transform: translateY(0) rotate(0deg);
}
/* 保证无JS时内容仍可见 */
.page-about .about-feature-card,
.page-about .about-why-item,
.page-about .about-why-stat {
  opacity: 1;
  transform: none;
}
/* 使用 prefers-reduced-motion 尊重用户偏好 */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-feature-card,
  .page-about .about-why-item,
  .page-about .about-why-stat {
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}
/* 当JS启用时，通过class控制动画 */
.page-about.js-enabled .about-feature-card,
.page-about.js-enabled .about-why-item,
.page-about.js-enabled .about-why-stat {
  opacity: 0;
  transform: translateY(20px) rotate(0.5deg);
}
.page-about.js-enabled .about-feature-card.visible,
.page-about.js-enabled .about-why-item.visible,
.page-about.js-enabled .about-why-stat.visible {
  opacity: 1;
  transform: translateY(0) rotate(0deg);
}

/* 确保最大宽度容器 */
.page-about .container {
  max-width: var(--container-max, 1200px);
  margin: 0 auto;
  padding: 0 20px;
}
@media (min-width: 768px) {
  .page-about .container {
    padding: 0 32px;
  }
}