/* ========== 关于我们页面样式 ========== */
/* 覆盖页眉吸顶，让页眉正常滚动，只保留内部 TAB 导航吸顶 */
.site-header {
  position: static;
}

:root {
  /* 页面专属变量：不与全局（style.css）冲突 */
  --text-dark: #111111;
  --text-gray: #555555;
  --light-gray: #f7f7f7;
  /* 页面级覆盖（勿删）：本页边框与页眉边框依赖此值 */
  --border-color: #e8e8e8;
  --transition: 0.3s ease;
}

/* 内容包裹器 */
.content-wrap {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.section-padding {
  padding: 70px 0;
}

.section-bg-gray {
  background: var(--light-gray);
}

.sub-title {
  display: block;
  color: var(--main-color);
  font-size: 16px;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 10px;
  text-align: center;
}

.section-title {
  font-size: 32px;
  color: var(--text-dark);
  margin-bottom: 40px;
  line-height: 1.3;
  text-align: center;
  font-weight: 700;
}

/* H2 下方介绍段落（与首页 .section-title p 保持一致） */
.factory-desc,
.certifications-desc {
  color: #666;
  max-width: 720px;
  margin: -28px auto 40px;
  font-size: 16px;
  line-height: 1.8;
  text-align: center;
}

/* ========== Banner（首屏图片，改用 <img> 承载 LCP） ========== */
.about-banner {
  position: relative;
  overflow: hidden;
  height: 36vh;
  min-height: 280px;
  background-color: #1a1a1a;
  display: flex;
  align-items: center;
  color: #fff;
}

/* 黑色遮罩层，让白色标题清晰可读 */
.about-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  z-index: 1;
  pointer-events: none;
}

/* LCP 背景图（真实 <img>，浏览器可在 HTML 中立即发现） */
.about-banner .about-banner-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  z-index: 0;
}

/* 文字内容必须浮在遮罩之上 */
.about-banner .content-wrap {
  position: relative;
  z-index: 2;
}

.about-banner-title {
  font-size: 36px;
  margin-bottom: 10px;
  font-weight: 700;
}

/* ========== 顶部锚点导航（TAB 导航吸顶） ========== */
.inner-nav-wrap {
  background: #ffffff;
  position: sticky;
  top: 0;
  z-index: 997;
  border-bottom: 1px solid var(--border-color);
}
.inner-nav {
  display: flex;
  justify-content: center;
  list-style: none;
  margin: 0;
  padding: 0;
}
.inner-nav li a {
  display: block;
  padding: 16px 22px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-gray);
  transition: var(--transition);
  position: relative;
  text-decoration: none;
  white-space: nowrap;
}
.inner-nav li a::after {
  content: "";
  width: 60%;
  height: 3px;
  background: var(--main-color);
  position: absolute;
  left: 20%;
  top: 0;
  transition: var(--transition);
  transform: scaleX(0);
}
.inner-nav li a.active,
.inner-nav li a:hover {
  color: var(--main-color);
}
.inner-nav li a.active::after,
.inner-nav li a:hover::after {
  transform: scaleX(1);
}

/* ========== 1. Company Profile ========== */
.profile-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}
.profile-image img {
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}
.profile-text p {
  color: var(--text-gray);
  line-height: 1.8;
  margin-bottom: 16px;
  font-size: 15px;
}

/* ========== 2. Our Factory ========== */
.factory-gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.factory-gallery img {
  width: 100%;
  aspect-ratio: 3 / 2;
  height: auto;
  object-fit: cover;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  transition: var(--transition);
}
.factory-gallery img:hover {
  transform: scale(1.02);
  box-shadow: 0 6px 16px rgba(0,0,0,0.1);
}

/* ========== 3. Manufacturing Capability ========== */
.capability-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.capability-item {
  background: #fff;
  padding: 28px 22px;
  text-align: center;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  border-bottom: 3px solid var(--main-color);
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  transition: var(--transition);
}
.capability-item:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 16px rgba(0,0,0,0.08);
}
.capability-icon {
  margin-bottom: 16px;
}
.capability-icon svg {
  width: 36px;
  height: 36px;
  color: var(--main-color);
}
.capability-item h3 {
  font-size: 18px;
  margin-bottom: 10px;
  color: #111;
  font-weight: 600;
}
.capability-item p {
  color: var(--text-gray);
  font-size: 14px;
  line-height: 1.7;
}

/* ========== 4. Quality Control ========== */
.quality-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.quality-item {
  background: #fff;
  padding: 28px 22px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.quality-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--main-color);
  opacity: 0;
  transition: var(--transition);
}
.quality-item:hover::before {
  opacity: 1;
}
.quality-step {
  display: inline-block;
  font-size: 32px;
  font-weight: 700;
  color: #f0f0f0;
  margin-bottom: 10px;
  line-height: 1;
}
.quality-item h3 {
  font-size: 18px;
  margin-bottom: 10px;
  color: var(--main-color);
  font-weight: 600;
}
.quality-item p {
  color: var(--text-gray);
  font-size: 14px;
  line-height: 1.7;
}

/* ========== 5. Certifications ========== */
.cert-grid {
  display: block;
  max-width: none;
  margin: 0;
}

.cert-item {
  width: 100%;
  max-width: none;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 24px;
  text-align: center;
  background: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  transition: var(--transition);
}

.cert-item:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 16px rgba(0,0,0,0.08);
}

.cert-item img {
  width: 100%;
  height: auto;
  object-fit: contain;
  background: #f9f9f9;
  margin: 0 auto 15px;
  display: block;
  border-radius: 4px;
}

.cert-item h4 {
  font-size: 16px;
  margin-bottom: 8px;
  color: var(--text-dark);
  font-weight: 600;
}

/* ========== 响应式适配 ========== */
@media (max-width: 1024px) {
  .inner-nav {
    justify-content: flex-start;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .inner-nav::-webkit-scrollbar {
    display: none;
  }
  .inner-nav li a {
    padding: 14px 18px;
    font-size: 14px;
  }
  .profile-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .capability-grid,
  .quality-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .factory-gallery {
    grid-template-columns: repeat(2, 1fr);
  }
  .section-title {
    font-size: 28px;
  }
  .about-banner-title {
    font-size: 30px;
  }
}

@media (max-width: 600px) {
  .capability-grid,
  .quality-grid {
    grid-template-columns: 1fr;
  }
  .factory-gallery {
    grid-template-columns: 1fr;
  }
  .section-padding {
    padding: 50px 0;
  }
  .about-banner {
    min-height: 220px;
  }
  .about-banner-title {
    font-size: 26px;
  }
}