/* ==========================================================================
           1. 基础重置与全局样式
           ========================================================================== */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: "Helvetica Neue", Helvetica, Arial, "Microsoft YaHei", sans-serif;
            color: #333333;
            background-color: #ffffff;
            line-height: 1.6;
            font-size: 16px; 
        }

        a {
            text-shadow: none;
            color: #333333;
            text-decoration: none;
            transition: color 0.3s ease;
        }

        a:hover {
            color: #E50012;
        }

        /* 统一的页面宽度控制容器 */
        .container {
            width: 92%;
            max-width: 1400px;
            margin: 0 auto;
        }



 /* ==========================================================================
           7. 响应式媒体查询
           ========================================================================== */
        @media (max-width: 992px) {
            .content-grid {
                grid-template-columns: repeat(2, minmax(0, 1fr)); 
                gap: 35px;
            }
            .section1 {
                height: 360px;
            }
        }

        @media (max-width: 768px) {
            body {
                font-size: 15px;
            }
            .navbar {
                align-items: center;
                gap: 12px;
                text-align: left;
            }
            .logo-area {
                width: 100%;
                justify-content: space-between;
            }
            .nav-toggle {
                display: block;
            }
            .nav-menu {
                display: none;
                width: 100%;
                flex-direction: column;
                gap: 0;
                margin-top: 4px;
                border-top: 1px solid #eeeeee;
            }
            .nav-menu.nav-menu-open {
                display: flex;
                z-index:9999
            }
            .nav-menu li {
                width: 100%;
                border-bottom: 1px solid #eeeeee;
            }
            .nav-menu a {
                display: block;
                padding: 14px 0;
                text-align: center;
            }
            .nav-toggle.nav-toggle-open .nav-toggle-bar:nth-child(1) {
                transform: translateY(7px) rotate(45deg);
            }
            .nav-toggle.nav-toggle-open .nav-toggle-bar:nth-child(2) {
                opacity: 0;
            }
            .nav-toggle.nav-toggle-open .nav-toggle-bar:nth-child(3) {
                transform: translateY(-7px) rotate(-45deg);
            }
            .section1 {
                height: 260px;
            }
            .content-grid {
                grid-template-columns: minmax(0, 1fr)!important; 
                gap: 40px;
            }
            .product-img-box {
                width: 100px; 
                height: 100px;
            }
            .footer-wrapper {
                flex-direction: column;
                align-items: center;
                text-align: center;
            }
            .footer-links {
                justify-content: center;
            }
            .top-bar {
                justify-content: center;
            }
        }

/* ==========================================================================
   头部大图样式（img 标签直接显示）
   ========================================================================== */
.page-banner {
  width: 100%;
  height: 240px;
  position: relative;
  overflow: hidden;
  margin: 0 auto;
  padding: 0;
}

.page-banner img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover; /* 关键：图片不变形、铺满全屏 */
}

/* ==========================================================================
   内页核心两栏布局
   ========================================================================== */
.inner-main-content {
  padding: 40px 0 60px 0;
  background-color: #ffffff;
}

.inner-layout-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 40px;
  align-items: start;
}

/* ---- 左侧侧边栏 ---- */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.sidebar-box-nav {
  border: 1px solid #dddddd;
  background-color: #ffffff;
}

.sidebar-title-nav {
  background: linear-gradient(to bottom, #777777, #555555);
  color: #ffffff;
  padding: 12px 15px;
  font-size: 18px;
  font-weight: bold;
}

.sidebar-menu {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar-menu li {
  border-bottom: 1px solid #eeeeee;
}

.sidebar-menu li:last-child {
  border-bottom: none;
}

.sidebar-menu a {
  display: block;
  padding: 12px 15px;
  font-size: 15px;
  color: #555555;
  transition: all 0.2s ease;
  text-decoration: none;
}

.sidebar-menu a::before {
  content: "› ";
  font-weight: bold;
  margin-right: 5px;
  color: #999999;
}

.sidebar-menu a:hover, .sidebar-menu li.active a {
  background-color: #f9f9f9;
  color: #E50012;
  padding-left: 20px;
}

        /* 还原菜单前面的小箭头符号 */
        .sidebar-menu a::before {
            content: "› ";
            font-weight: bold;
            margin-right: 6px;
            color: #999999;
        }

        .sidebar-menu a:hover, .sidebar-menu li.active a {
            background-color: #f9f9f9;
            color: #E50012;
            padding-left: 20px;
        }

        /* 联系方式区块 */
        .sidebar-box-contact {
            border: 1px solid #e2dcd0;
            background-color: #fdfcf9;
            padding: 20px;
        }

        .sidebar-title-contact {
            font-size: 18px;
            font-weight: bold;
            color: #b38833;
            border-bottom: 1px dashed #e2dcd0;
            padding-bottom: 8px;
            margin-bottom: 15px;
        }

        .contact-info-list {
            font-size: 14px;
            color: #666666;
            display: flex;
            flex-direction: column;
            gap: 10px;
            line-height: 1.5;
        }

        .contact-info-list strong {
            color: #333333;
        }