/* ==========================================================================
   BASE STYLES
   ========================================================================== */
   body {
    margin: 0;
    padding: 0;
    font-family: "Segoe UI", Arial, Helvetica, sans-serif;
    -webkit-font-smoothing: antialiased;
    background-color: #fff;
}

/* 修正核心：确保 ID 选择器 #site-header 拥有最高优先级 
   解决产品页显示为黑色块但没内容的问题，并确保背景色为纯黑
*/
#site-header, .site-header {
    width: 100%;
    background-color: #000 !important; /* 强制背景为黑色，与预览图一致 */
    min-height: 72px;
    position: sticky;
    top: 0;
    z-index: 9999; /* 确保抬头在所有内容（包括产品图）之上 */
    color: #fff;
    transition: box-shadow 0.3s ease;
}

/* 滚动后的阴影效果 */
.site-header.scrolled {
    box-shadow: 0 6px 20px rgba(0,0,0,0.5);
}

.header-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* ==========================================================================
   LOGO & NAVIGATION
   ========================================================================== */
.logo {
    display: flex;
    align-items: center;
}

/* 修正：确保 Logo 即使在内容动态加载后也能保持正确高度 */
.logo img {
    max-height: 40px; 
    width: auto;
    display: block;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 25px; /* 稍微收紧间距，适配更多导航项 */
}

/* 修正：强制导航文字为白色，防止被全局样式覆盖 */
.main-nav a {
    color: #ffffff !important; 
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    white-space: nowrap;
    padding: 10px 5px; /* 增加点击区域 */
    transition: color 0.2s ease;
}

.main-nav a:hover {
    color: #f5a400 !important;
}

/* 激活状态标识（当前页面） */
.main-nav a.active {
    color: #f5a400 !important;
    position: relative;
}

.main-nav a.active::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 5px;
    right: 5px;
    height: 2px;
    background: #f5a400;
}

/* ==========================================================================
   MEGA MENU (保持不变，确保黑色背景下的可见性)
   ========================================================================== */
.nav-item {
    position: relative;
    display: inline-flex;
    align-items: center;
}

.has-mega > a::after {
    content: "▼";
    font-size: 9px;
    margin-left: 6px;
    vertical-align: middle;
    opacity: 0.8;
}

.mega-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    background: #111;
    width: 900px; 
    padding: 30px 40px;
    display: flex;
    gap: 40px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.6);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease;
    border-top: 3px solid #f5a400;
}

.has-mega:hover .mega-menu {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto;
}

.mega-col {
    flex: 1;
    min-width: 180px;
}

.mega-col h4 {
    color: #f5a400;
    font-size: 15px;
    margin: 0 0 16px 0;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.mega-col a {
    display: block;
    color: #bbb;
    font-size: 14px;
    margin: 10px 0;
    transition: color 0.2s ease;
}

.mega-col a:hover {
    color: #fff;
    text-decoration: underline;
}

/* 1. 确保导航项是相对定位的，这样下拉菜单才能相对于它定位 */
.main-nav .nav-item {
  position: relative;
  display: inline-block;
  height: 100%;
}

/* 2. 下拉菜单默认样式：隐藏、绝对定位 */
.dropdown-menu {
  display: none;          /* 默认隐藏 */
  position: absolute;     /* 绝对定位，使其浮动在上方，不占用原来的空间 */
  top: 100%;              /* 在父元素正下方 */
  left: 0;
  background-color: #000; /* 背景黑色，匹配你的网站风格 */
  min-width: 220px;       /* 最小宽度，防止文字换行太丑 */
  box-shadow: 0 4px 8px rgba(0,0,0,0.3);
  padding: 10px 0;
  z-index: 1000;          /* 确保显示在最上层 */
  list-style: none;       /* 去掉列表原本的点 */
  margin: 0;
}

/* 3. 鼠标悬停时显示下拉菜单 */
.nav-item:hover .dropdown-menu {
  display: block;
}

/* 4. 下拉菜单里的链接样式 */
.dropdown-menu li a {
  display: block;         /* 占满整行 */
  padding: 10px 20px;
  color: #fff;            /* 白色文字 */
  text-decoration: none;
  font-size: 14px;
  white-space: nowrap;    /* 防止文字换行 */
  transition: background 0.3s;
}

/* 5. 下拉菜单悬停效果 */
.dropdown-menu li a:hover {
  background-color: #333; /* 鼠标放上去变深灰色 */
  color: #ff00de;         /* 可选：鼠标放上去文字变色，或者保持白色 */
}

/* 小箭头样式微调 */
.arrow {
  font-size: 10px;
  margin-left: 4px;
  vertical-align: middle;
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 1024px) {
    .mega-menu {
        width: 95vw;
    }
    .main-nav {
        gap: 15px;
    }
}

@media (max-width: 768px) {
    .header-inner {
        height: 64px;
    }
    /* 移动端建议将导航改为汉堡菜单，此处暂时保持隐藏以防布局错乱 */
    .main-nav {
        display: none;
    }
}
/* =====================================================
   GLOBAL COMPONENTS
===================================================== */

/* ==============================
   PROJECTS – SHARED BASE STYLE
================================ */

.related-projects {
    padding: 80px 0;
    background: #0b0b0b;
  }
  
  .related-projects .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
  }
  
  .related-projects h2,
  .related-projects .section-title {
    color: #ffffff;
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 16px;
  }
  
  .related-projects .section-lead {
    color: #cfcfcf;
    font-size: 16px;
    line-height: 1.7;
    max-width: 720px;
    margin-bottom: 32px;
  }
  
  /* ==============================
     PROJECTS – BRAND OVERVIEW
  ================================ */
  
  .related-projects-overview {
    text-align: left;
  }
  
  .related-projects-overview .btn-outline {
    display: inline-block;
    padding: 12px 28px;
    border: 1px solid #ffffff;
    color: #ffffff;
    text-decoration: none;
    font-size: 14px;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
  }
  
  .related-projects-overview .btn-outline:hover {
    background: #ffffff;
    color: #000000;
  }
  
  /* ==============================
     PROJECTS – USED IN PROJECTS
  ================================ */
  
  .related-projects-dynamic {
    background: #0f0f0f;
  }
  
  .related-projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
    margin-top: 24px;
  }
  
  .related-project-card {
    display: block;
    background: #161616;
    border-radius: 14px;
    overflow: hidden;
    text-decoration: none;
    transition: all 0.35s ease;
  }
  
  .related-project-card img {
    width: 100%;
    height: auto;
    display: block;
  }
  
  .related-project-card h3 {
    color: #ffffff;
    font-size: 18px;
    font-weight: 500;
    padding: 16px 18px;
    line-height: 1.4;
  }
  
  .related-project-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
  }
  
  @media (max-width: 768px) {
  
    .related-projects {
      padding: 56px 0;
    }
  
    .related-projects h2,
    .related-projects .section-title {
      font-size: 26px;
    }
  
    .related-project-card h3 {
      font-size: 16px;
    }
  }