/* ========== 基础重置 ========== */
* { margin: 0; padding: 0; box-sizing: border-box; overflow-wrap: break-word; font-family: system-ui, -apple-system, "Microsoft YaHei", sans-serif; font-display: swap; }

/* ========== CSS变量 ========== */
:root {
    --main: #0057a8;
    --sub: #004080;
    --orange: #ff6600;
    --dark: #1a2430;
    --text-title: #111111;
    --text-body: #444444;
    --text-tip: #777777;
    --light-bg: #f5f7fa;
    --light-blue: #e8f2fc;
    --white: #ffffff;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 6px 18px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 30px rgba(0, 87, 168, 0.15);
    --transition: all 0.25s ease;
    --space-lg: 80px;
    --space-md: 50px;
    --space-sm: 30px;
}

/* ========== 通用元素 ========== */
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
img { max-width: 100%; height: auto; loading: lazy; decoding: async; }
input, textarea, button { border: 0; outline: none; font-family: inherit; }

/* ========== 容器 ========== */
.container { width: 1240px; max-width: 100%; padding: 0 20px; margin: 0 auto; }

/* ========== 顶部通栏 ========== */
.top-bar { background: var(--dark); color: #fff; padding: 10px 0; font-size: 14px; }
.top-bar .flex { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; }
.top-tel span { margin-right: 24px; }
.top-tel strong { color: var(--orange); font-size: 15px; }
.top-notice { color: #cce0ff; letter-spacing: 0.5px; }
.top-link a { color: #ffcc88; }

/* ========== 导航头部 ========== */
.nav-header { background: var(--white); box-shadow: var(--shadow-sm); position: sticky; top: 0; z-index: 999; }
.nav-wrap { display: flex; justify-content: space-between; align-items: center; height: 78px; }
.logo { font-size: 26px; font-weight: 700; color: var(--main); line-height: 1.2; }
.logo small { display: block; font-size: 13px; color: var(--text-tip); font-weight: normal; }
.nav-list { display: flex; gap: 36px; position: relative; }
.nav-list > li { position: relative; }
.nav-list li a { font-size: 15px; padding: 10px 0; position: relative; color: var(--text-body); font-weight: 500; }
.nav-list li a.active { color: var(--main); }
.nav-list li a.active::after { width: 100%; }
.nav-list li a:hover { color: var(--main); }
.nav-list li a::after { content: ""; position: absolute; bottom: 0; left: 0; width: 0; height: 3px; background: var(--main); transition: var(--transition); border-radius: 3px; }
.sub-menu { position: absolute; top: 100%; left: 0; width: 200px; background: var(--white); box-shadow: var(--shadow-md); border-radius: var(--radius-sm); padding: 16px; display: none; margin-top: 6px; }
.sub-menu li { padding: 8px 0; }
.sub-menu li a { font-size: 14px; }
.nav-list li:hover .sub-menu { display: block; }
.nav-btn { background: var(--orange); color: #fff; padding: 11px 22px; border-radius: var(--radius-sm); font-weight: 500; }
.nav-btn:hover { opacity: 0.92; transform: translateY(-2px); box-shadow: 0 4px 12px rgba(255, 102, 0, 0.2); }
.menu-mobile { display: none; font-size: 28px; cursor: pointer; }

/* ========== 内页横幅 ========== */
.page-banner { height: 320px; background: linear-gradient(rgba(0,40,100,0.8),rgba(0,40,100,0.8)),#003370; display:flex;align-items:center;justify-content:center;text-align:center;color:#fff;}
.page-banner h1 { font-size:42px;margin-bottom:12px; }
.page-banner p { font-size:18px;opacity:0.9; }

/* ========== 通用区块 ========== */
.section { padding: var(--space-lg) 0; }
.section-light { background: var(--light-bg); }
.section-title { text-align: center; margin-bottom: var(--space-md); }
.section-title h3 { font-size: 36px; color: var(--text-title); margin-bottom: 16px; position: relative; display: inline-block; padding-bottom: 18px; font-weight: 600; }
.section-title h3::after { content: ""; width: 80px; height: 4px; background: var(--main); position: absolute; left: 50%; transform: translateX(-50%); bottom: 0; border-radius: 4px; }
.section-title p { color: var(--text-tip); font-size: 17px; max-width: 960px; margin: 0 auto; line-height: 1.75; text-align: center; }

/* ========== 卡片通用 ========== */
.card { background: var(--white); border-radius: var(--radius); box-shadow: var(--shadow-sm); transition: var(--transition); overflow: hidden; }
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.card-body { padding: 30px; }
.card h4 { font-size: 20px; color: var(--text-title); margin-bottom: 12px; font-weight: 600; }
.card p { font-size: 15px; color: var(--text-body); line-height: 1.7; }
.tag { display: inline-block; background: var(--light-blue); color: var(--main); font-size: 13px; padding: 4px 10px; border-radius: 20px; font-weight: 500; }

/* ========== 网格布局 ========== */
.adv-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; }

/* ========== 筛选按钮 ========== */
.filter-bar { display: flex; gap: 14px; justify-content: flex-start; margin-bottom: 44px; flex-wrap: wrap; }
.filter-bar.active, .filter-bar-centered { justify-content: center; }
.filter-btn { padding: 10px 22px; border: 1px solid var(--main); border-radius: var(--radius-sm); color: var(--main); background: transparent; cursor: pointer; transition: var(--transition); font-size: 15px; }
.filter-btn.active, .filter-btn:hover { background: var(--main); color: #fff; box-shadow: 0 4px 14px rgba(0,87,168,0.2); }

/* ========== 通用图片容器 ========== */
.pro-img { height: 220px; background: #f5f5f5; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.case-img { height: 240px; background: #f5f5f5; display: flex; align-items: center; justify-content: center; overflow: hidden; }

/* ========== 通用图片适配工具类 ========== */
/* 方式1：contain - 完整显示，保持比例，可能留白（推荐用于产品图） */
.img-fit { width: 100%; height: 100%; object-fit: contain; display: block; }

/* 方式2：cover - 填充容器，保持比例，裁剪溢出（推荐用于背景/横幅） */
.img-cover { width: 100%; height: 100%; object-fit: cover; display: block; }

/* 方式3：fill - 拉伸填满，可能变形（不推荐，但可备用） */
.img-fill { width: 100%; height: 100%; object-fit: fill; display: block; }

/* 方式4：基础响应式 - 宽度自适应，高度按比例 */
.img-responsive { max-width: 100%; height: auto; display: block; }

/* 统一图片容器内的img标签默认样式（防止变形） */
.pro-img img,
.case-img img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
    max-width: 100%;
    max-height: 100%;
}

/* ========== 表单通用 ========== */
.form-item { margin-bottom: 20px; }
.form-item input, .form-item textarea { width: 100%; padding: 14px 18px; border: 1px solid #ddd; border-radius: var(--radius-sm); font-size: 16px; transition: var(--transition); }
.form-item input:focus, .form-item textarea:focus { border-color: var(--main); box-shadow: 0 0 0 4px rgba(0, 87, 168, 0.12); }
textarea { height: 140px; resize: none; }
.submit-btn { width: 100%; padding: 16px; background: var(--main); color: #fff; border-radius: var(--radius-sm); font-size: 17px; cursor: pointer; transition: var(--transition); font-weight: 500; }
.submit-btn:hover { background: var(--sub); transform: translateY(-3px); box-shadow: 0 6px 20px rgba(0, 87, 168, 0.25); }

/* ========== 通用按钮（全局工具类） ========== */
.btn-blue,
.btn-white,
.btn-orange {
    display: inline-block;
    padding: 14px 32px;
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-weight: 500;
    text-decoration: none;
    line-height: 1;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    box-sizing: border-box;
}
.btn-blue {
    background: var(--main);
    color: #fff;
    box-shadow: 0 6px 20px rgba(0, 87, 168, 0.3);
}
.btn-blue:hover {
    background: var(--sub);
    color: #fff;
    transform: translateY(-3px);
    box-shadow: 0 10px 28px rgba(0, 87, 168, 0.35);
}
.btn-white {
    background: rgba(255, 255, 255, 0.95);
    color: var(--dark);
}
.btn-white:hover {
    background: #fff;
    color: var(--main);
    transform: translateY(-3px);
}
.btn-orange {
    background: var(--orange);
    color: #fff;
    box-shadow: 0 4px 14px rgba(255, 102, 0, 0.25);
}
.btn-orange:hover {
    opacity: 0.92;
    color: #fff;
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(255, 102, 0, 0.35);
}

/* ========== 页脚 ========== */
footer { background: var(--dark); color: #aaa; padding: 70px 0 40px; }
.foot-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 40px; margin-bottom: 50px; }
.foot-col h5 { color: #fff; font-size: 20px; margin-bottom: 24px; padding-bottom: 12px; border-bottom: 1px solid #333; font-weight: 600; }
.foot-col ul li { margin-bottom: 14px; font-size: 15px; }
.foot-col a:hover { color: #fff; }
.copyright { text-align: center; padding-top: 24px; border-top: 1px solid #333; font-size: 15px; color: #888; line-height: 1.7; }

/* ========== 悬浮按钮 ========== */
.float-tel { position: fixed; right: 24px; bottom: 110px; width: 56px; height: 56px; background: var(--orange); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 26px; z-index: 998; transition: var(--transition); box-shadow: 0 6px 20px rgba(255,102,0,0.25); }
.float-tel:hover { transform: scale(1.08); }
.float-consult { position: fixed; right: 24px; bottom: 36px; width: 56px; height: 56px; background: var(--main); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 26px; z-index: 998; cursor: pointer; transition: var(--transition); box-shadow: 0 6px 20px rgba(0,87,168,0.25); }
.float-consult:hover { transform: scale(1.08); }
.back-top { position: fixed; left: 24px; bottom: 36px; width: 48px; height: 48px; background: rgba(0,0,0,0.35); color: #fff; border-radius: 50%; display: none; align-items: center; justify-content: center; z-index: 998; cursor: pointer; font-size: 20px; }

/* ========== 弹窗 ========== */
.modal-mask { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.65); z-index: 9999; display: none; align-items: center; justify-content: center; padding: 24px; }
.modal-box { background: #fff; border-radius: var(--radius); max-width: 1080px; width: 100%; max-height: 90vh; overflow-y: auto; padding: 40px; position: relative; box-shadow: 0 12px 40px rgba(0,0,0,0.2); }
.modal-close { position: absolute; top: 20px; right: 24px; font-size: 30px; cursor: pointer; color: var(--text-tip); transition: var(--transition); }
.modal-close:hover { color: var(--text-title); }

/* ========== 淡入动画 ========== */
.fade-in { opacity: 0; transform: translateY(24px); transition: all 0.5s ease; }
.fade-in.show { opacity: 1; transform: translateY(0); }

/* ========== 响应式断点 ========== */
@media(min-width: 1024px) { /* PC端保持现有布局 */ }
@media(max-width: 1024px) {
    .adv-grid { grid-template-columns: repeat(2, 1fr); gap: 26px; }
    .section { padding: 60px 0; }
}
@media(max-width: 768px) {
    .nav-list { display: none; position: absolute; top: 78px; left: 0; width: 100%; background: var(--white); flex-direction: column; padding: 16px 24px; gap: 16px; box-shadow: var(--shadow-md); z-index: 100; }
    .nav-list.show { display: flex; }
    .menu-mobile { display: block; }
    .nav-btn { display: none; }
    .sub-menu { position: static; box-shadow: none; width: 100%; padding: 8px 0; margin-top: 8px; }
    .container { padding: 0 16px; }
    .page-banner { height: 200px; }
    .page-banner h1 { font-size: 28px; }
    .page-banner p { font-size: 15px; }
    .adv-grid { grid-template-columns: 1fr; gap: 20px; }
    .section { padding: 50px 0; }
    .section-title { margin-bottom: 30px; }
    .section-title h3 { font-size: 26px; padding-bottom: 14px; }
    .section-title h3::after { width: 60px; height: 3px; }
    .section-title p { font-size: 15px; }
    .filter-bar { gap: 10px; margin-bottom: 30px; }
    .filter-btn { padding: 8px 16px; font-size: 14px; min-height: 44px; }
    .card { padding: 20px 16px; }
    .card-body { padding: 20px 16px; }
    .card h4 { font-size: 18px; }
    .card p { font-size: 14px; }
    .pro-img, .case-img { height: 180px; }
    .form-item input, .form-item textarea { padding: 12px 14px; font-size: 16px; min-height: 44px; }
    .submit-btn { padding: 14px; font-size: 16px; min-height: 44px; }
    footer { padding: 50px 0 30px; }
    .foot-grid { grid-template-columns: 1fr; gap: 30px; }
    .foot-col h5 { font-size: 18px; margin-bottom: 16px; }
    .foot-col ul li { margin-bottom: 10px; }
    .float-tel, .float-consult { width: 50px; height: 50px; font-size: 22px; right: 16px; }
    .float-tel { bottom: 140px; }
    .float-consult { bottom: 80px; }
    .back-top { right: 16px; left: auto; bottom: 20px; }
    .modal-box { padding: 24px 20px; }
    .modal-close { top: 16px; right: 16px; font-size: 28px; }
}
@media(max-width: 576px) {
    .section { padding: 40px 0; }
    .section-title h3 { font-size: 22px; }
    .section-title { margin-bottom: 30px; }
    .pro-img, .case-img { height: 160px; }
}

/* ========== Bootstrap风格分页样式 ========== */
.pagination{display:inline-block;padding-left:0;margin:20px 0;border-radius:4px}
.pagination>li{display:inline}
.pagination>li>a,.pagination>li>span{position:relative;float:left;padding:6px 12px;margin-left:-1px;line-height:1.42857143;color:#428bca;text-decoration:none;background-color:#fff;border:1px solid #ddd;font-size: 1rem;}.pagination>li:first-child>a,.pagination>li:first-child>span{margin-left:0;border-top-left-radius:4px;border-bottom-left-radius:4px}
.pagination>li:last-child>a,.pagination>li:last-child>span{border-top-right-radius:4px;border-bottom-right-radius:4px}
.pagination>li>a:hover,.pagination>li>span:hover,.pagination>li>
a:focus,.pagination>li>span:focus{color:#2a6496;background-color:#eee;border-color:#ddd}
.pagination>.active>a,.pagination>.active>span,.pagination>.active>a:hover,.pagination>.active>span:hover,.pagination>.active>a:focus,.pagination>.active>span:focus{z-index:2;color:#fff;cursor:default;background-color:#428bca;border-color:#428bca}
.pagination>.disabled>span,.pagination>.disabled>span:hover,.pagination>.disabled>span:focus,.pagination>.disabled>a,.pagination>.disabled>a:hover,.pagination>.disabled>a:focus{color:#777;cursor:not-allowed;background-color:#fff;border-color:#ddd}.pagination-lg>li>a,.pagination-lg>li>span{padding:10px 16px;font-size:18px}.pagination-lg>li:first-child>a,.pagination-lg>li:first-child>span{border-top-left-radius:6px;border-bottom-left-radius:6px}
.pagination-lg>li:last-child>a,.pagination-lg>li:last-child>span{border-top-right-radius:6px;border-bottom-right-radius:6px}
.pagination-sm>li>a,.pagination-sm>li>span{padding:5px 10px;font-size:12px}
.pagination-sm>li:first-child>a,.pagination-sm>li:first-child>span{border-top-left-radius:3px;border-bottom-left-radius:3px}
.pagination-sm>li:last-child>a,.pagination-sm>li:last-child>span{border-top-right-radius:3px;border-bottom-right-radius:3px}.pager{padding-left:0;margin:20px 0;text-align:center;list-style:none}
.pager li{display:inline}.pager li>a,.pager li>span{display:inline-block;padding:5px 14px;background-color:#fff;border:1px solid #ddd;border-radius:15px}
.pager li>a:hover,.pager li>a:focus{text-decoration:none;background-color:#eee}.pager .next>a,.pager .next>span{float:right}
.pager .previous>a,.pager .previous>span{float:left}
.pager .disabled>a,.pager .disabled>a:hover,.pager .disabled>a:focus,.pager .disabled>span{color:#777;cursor:not-allowed;background-color:#fff}

/* 分页响应式 */
@media(max-width: 768px) {
    .pagination-wrap {
        flex-direction: column;
        align-items: center;
        gap: 12px;
    }
    .pagination {
        flex-wrap: wrap;
        justify-content: center;
        gap: 4px;
    }
    .pagination .page-link {
        padding: 6px 12px;
        font-size: 13px;
        min-width: 34px;
    }
    .pagination-info {
        font-size: 13px;
    }
}
.text-left{text-align:left}.text-right{text-align:right}.text-center{text-align:center}.text-justify{text-align:justify}.text-nowrap{white-space:nowrap}.text-lowercase{text-transform:lowercase}.text-uppercase{text-transform:uppercase}.text-capitalize{text-transform:capitalize}.text-muted{color:#777}.text-primary{color:#337ab7}