/* ========================================
   关于我们页面 - 面包屑 & 各板块样式
   移植自 E:\Desktop\NaHong\assets\css\about.css
   ======================================== */

/* ========================================
   面包屑导航
   ======================================== */
.about-breadcrumb {
  margin-top: var(--navbar-height);
  padding: 14px 165px;
  background-color: var(--gray-50);
  border-bottom: 1px solid var(--gray-200);
}

.about-breadcrumb a {
  font-size: 13px;
  color: var(--gray-500);
  letter-spacing: 0.5px;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.about-breadcrumb a:hover {
  color: var(--gray-800);
}

.about-breadcrumb .separator {
  margin: 0 8px;
  color: var(--gray-400);
  font-size: 12px;
}

.about-breadcrumb .current {
  font-size: 13px;
  color: var(--gray-800);
  letter-spacing: 0.5px;
  font-weight: 500;
}

/* ========================================
   关于我们 - 顶部标题区
   ======================================== */
.about-header {
  padding: 64px 165px 48px;
  background-color: #ffffff;
  text-align: center;
}

.about-header h1 {
  font-size: 34px;
  font-weight: 700;
  color: #333333;
  letter-spacing: 3px;
  margin-bottom: 12px;
}

.about-header .header-line {
  width: 40px;
  height: 3px;
  background-color: var(--blue-500);
  margin: 0 auto 14px;
}

.about-header p {
  font-size: 15px;
  color: var(--gray-500);
  letter-spacing: 1px;
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ========================================
   区域通用
   ======================================== */
.about-section {
  padding: 60px 165px 64px;
}

.about-section:nth-child(even) {
  background-color: var(--gray-50);
}

.about-section:nth-child(odd) {
  background-color: #ffffff;
}

/* ========================================
   1. 公司介绍 - 左图右文
   ======================================== */
.about-intro {
  display: flex;
  align-items: stretch;
  gap: 0;
  min-height: 480px;
  background-color: #ffffff;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.about-intro .intro-image {
  flex: 0 0 50%;
  position: relative;
  overflow: hidden;
  min-height: 480px;
}

.about-intro .intro-image img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-intro .intro-text {
  flex: 0 0 50%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 52px 56px;
}

.about-intro .intro-text h2 {
  font-size: 26px;
  font-weight: 700;
  color: #333333;
  letter-spacing: 2px;
  margin-bottom: 6px;
}

.about-intro .intro-text .intro-subtitle {
  font-size: 13px;
  color: var(--gray-400);
  letter-spacing: 1px;
  font-style: italic;
  margin-bottom: 16px;
}

.about-intro .intro-text .intro-divider {
  width: 32px;
  height: 2px;
  background-color: var(--blue-500);
  margin-bottom: 18px;
}

.about-intro .intro-text .intro-desc {
  font-size: 14px;
  color: var(--gray-600);
  line-height: 2;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

/* 使命愿景标签 */
.about-intro .intro-mission {
  display: flex;
  gap: 24px;
  margin-top: 20px;
}

.about-intro .intro-mission .mission-item {
  flex: 1;
  padding: 16px 20px;
  background-color: var(--gray-50);
}

.about-intro .intro-mission .mission-item .mission-label {
  display: block;
  font-size: 11px;
  color: var(--blue-500);
  letter-spacing: 2px;
  margin-bottom: 6px;
  font-weight: 600;
}

.about-intro .intro-mission .mission-item .mission-value {
  display: block;
  font-size: 14px;
  color: var(--gray-700);
  letter-spacing: 0.5px;
  line-height: 1.6;
}

/* ========================================
   2. 公司优势 - 四列卡片
   ======================================== */
.about-advantages {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.advantage-card {
  background-color: #ffffff;
  border-radius: 12px;
  padding: 36px 28px 32px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  transition: box-shadow var(--transition-normal);
}

.advantage-card:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.10);
}

.advantage-card .adv-icon {
  width: 44px;
  height: 44px;
  margin-bottom: 18px;
  color: var(--blue-500);
}

.advantage-card .adv-icon svg,
.advantage-card .adv-icon img {
  width: 100%;
  height: 100%;
}

.advantage-card .adv-icon img {
  object-fit: contain;
}

.advantage-card h3 {
  font-size: 16px;
  font-weight: 700;
  color: #333333;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
}

.advantage-card .adv-desc {
  font-size: 13px;
  color: var(--gray-500);
  line-height: 1.8;
  letter-spacing: 0.4px;
}

/* ========================================
   3. 公司环境 - 2×2 网格
   ======================================== */
.env-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.env-card {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  height: 280px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.env-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.env-card:hover img {
  transform: scale(1.06);
}

.env-card .env-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: 20px 24px;
  background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
  z-index: 1;
}

.env-card .env-overlay h3 {
  font-size: 16px;
  font-weight: 600;
  color: #ffffff;
  letter-spacing: 1px;
  margin-bottom: 2px;
}

.env-card .env-overlay p {
  font-size: 12px;
  color: rgba(255,255,255,0.7);
  letter-spacing: 0.5px;
}

/* ========================================
   4. 公司客户 - Logo 墙
   ======================================== */
.client-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.client-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px 16px 20px;
  background-color: #ffffff;
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  min-height: 120px;
  transition: box-shadow var(--transition-normal);
}

.client-card:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.10);
}

/* 客户卡片带链接时保持无下划线 */
a.client-card {
  text-decoration: none;
  color: inherit;
}

.client-card .client-logo {
  width: 64px;
  height: 64px;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.client-card .client-logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.client-card .client-name {
  font-size: 13px;
  color: var(--gray-600);
  letter-spacing: 0.5px;
  text-align: center;
}

/* ========================================
   5. 公司证书 - 单张占位图片
   ======================================== */

.cert-placeholder {
  width: 100%;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.cert-placeholder img {
  width: 100%;
  height: 700px;
  object-fit: cover;
  display: block;
}

/* ========================================
   5b. 公司证书 - 多证书网格（扩展）
   ======================================== */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.cert-card {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.cert-card img {
  width: 100%;
  height: 420px;
  object-fit: cover;
  display: block;
}

.cert-card .cert-info {
  padding: 16px 20px;
  background-color: #ffffff;
}

.cert-card .cert-info h3 {
  font-size: 15px;
  font-weight: 600;
  color: #333333;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.cert-card .cert-info p {
  font-size: 12px;
  color: var(--gray-500);
  letter-spacing: 0.4px;
  line-height: 1.6;
}
/* ========================================
   响应式布局
   ======================================== */
@media (max-width: 1200px) {
  .about-breadcrumb,
  .about-header,
  .about-section {
    padding-left: 40px;
    padding-right: 40px;
  }

  .about-intro .intro-text {
    padding: 40px;
  }

  .about-advantages {
    gap: 16px;
  }

  .advantage-card {
    padding-left: 22px;
    padding-right: 22px;
  }
}
@media (min-width: 768px) and (max-width: 900px) {
  .about-advantages,
  .client-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 767px) {
  .about-breadcrumb {
    margin-top: var(--navbar-height);
    padding: 12px 20px;
    text-align: center;
  }

  .about-breadcrumb a,
  .about-breadcrumb .current {
    font-size: 12px;
  }

  .about-header {
    padding: 42px 20px 32px;
  }

  .about-header h1 {
    font-size: 28px;
    letter-spacing: 2px;
  }

  .about-header p {
    max-width: 320px;
    font-size: 14px;
    letter-spacing: 0.5px;
  }

  .about-section {
    padding: 32px 20px 36px;
  }

  .about-intro {
    display: flex;
    flex-direction: column;
    min-height: 0;
    border-radius: 10px;
  }

  .about-intro .intro-image {
    flex: none;
    min-height: 0;
    aspect-ratio: 4 / 3;
  }

  .about-intro .intro-image img {
    position: absolute;
  }

  .about-intro .intro-text {
    flex: none;
    display: block;
    padding: 28px 22px 30px;
  }

  .about-intro .intro-text h2 {
    font-size: 23px;
    letter-spacing: 1px;
  }

  .about-intro .intro-text .intro-desc {
    font-size: 14px;
    line-height: 1.9;
    letter-spacing: 0;
  }

  .about-intro .intro-mission {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 18px;
  }

  .about-intro .intro-mission .mission-item {
    flex: none;
    padding: 13px 16px;
  }

  .about-advantages,
  .env-grid,
  .client-grid,
  .cert-grid {
    grid-template-columns: 1fr;
  }

  .about-advantages {
    gap: 14px;
  }

  .advantage-card {
    display: grid;
    grid-template-columns: 44px minmax(0, 1fr);
    column-gap: 16px;
    padding: 22px 20px;
  }

  .advantage-card .adv-icon {
    grid-row: span 2;
    margin-bottom: 0;
  }

  .advantage-card h3 {
    align-self: end;
    margin-bottom: 5px;
  }

  .advantage-card .adv-desc {
    align-self: start;
  }

  .env-grid,
  .client-grid,
  .cert-grid {
    gap: 14px;
  }

  .env-card {
    height: auto;
    aspect-ratio: 16 / 10;
  }

  .env-card .env-overlay {
    padding: 16px 18px;
  }

  .client-card {
    min-height: 104px;
    padding: 18px 14px;
  }

  .cert-placeholder img {
    height: auto;
    max-height: none;
    object-fit: contain;
  }

  .cert-card img {
    height: auto;
    aspect-ratio: 4 / 3;
    object-fit: cover;
  }
}

@media (max-width: 380px) {
  .about-breadcrumb,
  .about-header,
  .about-section {
    padding-left: 16px;
    padding-right: 16px;
  }

  .about-intro .intro-text {
    padding-left: 18px;
    padding-right: 18px;
  }

  .advantage-card {
    grid-template-columns: 38px minmax(0, 1fr);
    column-gap: 12px;
    padding-left: 16px;
    padding-right: 16px;
  }

  .advantage-card .adv-icon {
    width: 38px;
    height: 38px;
  }
}