/* ===== all or bass ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif; color: #333; line-height: 1.6; background: #fff; }
a { text-decoration: none; color: inherit; transition: color 0.3s; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 10px; }
.section { padding: 80px 0; }
.section-title { text-align: center; margin-bottom: 50px; }
.section-title .en { font-size: 14px; color: #E8832A; letter-spacing: 3px; text-transform: uppercase; font-weight: 600; }
.section-title h2 { font-size: 32px; color: #1B3A5C; margin: 8px 0 12px; font-weight: 700; }
.section-title p { font-size: 15px; color: #888; max-width: 600px; margin: 0 auto; }
.btn-primary { display: inline-block; background: #E8832A; color: #fff; padding: 12px 32px; border-radius: 4px; font-size: 15px; font-weight: 600; transition: all 0.3s; border: none; cursor: pointer; }
.btn-primary:hover { background: #d4731e; transform: translateY(-2px); box-shadow: 0 4px 15px rgba(232,131,42,0.4); }
.btn-outline { display: inline-block; border: 2px solid #1B3A5C; color: #1B3A5C; padding: 10px 28px; border-radius: 4px; font-size: 15px; font-weight: 600; transition: all 0.3s; cursor: pointer; background: transparent; }
.btn-outline:hover { background: #1B3A5C; color: #fff; }

/* ===== Header / Navigation ===== */
.header { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; background: #fff; box-shadow: 0 2px 10px rgba(0,0,0,.08); transition: all .3s; }
.nav-wrap { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.logo { display: flex; align-items: center; gap: 10px; }
.logo-icon { width: 42px; height: 42px; background: linear-gradient(135deg, #fff, #fff); border-radius: 8px; display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 900; font-size: 18px; }
.logo-text { font-size: 20px; font-weight: 700; color: #1B3A5C; }
.logo-text span { font-size: 11px; color: #888; display: block; font-weight: 400; letter-spacing: 1px; }
.nav { display: flex; align-items: center; gap: 5px; }
.nav > a, .nav > .dropdown > .dropdown-toggle { padding: 8px 16px; font-size: 15px; color: #333; font-weight: 500; border-radius: 4px; transition: all .3s; cursor: pointer; display: inline-block; }
.nav > a:hover, .nav > a.active, .nav > .dropdown:hover > .dropdown-toggle { color: #E8832A; }
.dropdown { position: relative; }
.dropdown-menu { position: absolute; top: 100%; left: 0; background: #fff; min-width: 200px; box-shadow: 0 8px 25px rgba(0,0,0,.12); border-radius: 6px; padding: 8px 0; opacity: 0; visibility: hidden; transform: translateY(10px); transition: all .3s; }
.dropdown:hover .dropdown-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown-menu a { display: block; padding: 10px 20px; font-size: 14px; color: #555; transition: all .2s; }
.dropdown-menu a:hover { background: #F5F7FA; color: #E8832A; }
.menu-toggle { display: none; font-size: 26px; cursor: pointer; color: #1B3A5C; background: none; border: none; }

/* ===== Hero Banner ===== */
.hero { position: relative; min-height: 600px; display: flex; align-items: center; background: linear-gradient(135deg, #0d1f33 0%, #1B3A5C 50%, #2a5a8c 100%); overflow: hidden; margin-top: 75px; /*background:url()*/}
.hero::before { content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="40" fill="none" stroke="rgba(255,255,255,0.03)" stroke-width="0.5"/></svg>') repeat; opacity: 0.5; }
.hero-content { position: relative; z-index: 2; max-width: 650px; }
.hero-badge { display: inline-block; background: rgba(232,131,42,0.15); color: #E8832A; padding: 6px 18px; border-radius: 20px; font-size: 13px; font-weight: 600; margin-bottom: 20px; letter-spacing: 1px; }
.hero h1 { font-size: 42px; color: #fff; line-height: 1.3; margin-bottom: 20px; font-weight: 800; }
.hero h1 span { color: #E8832A; }
.hero p { font-size: 17px; color: rgba(255,255,255,0.75); margin-bottom: 35px; line-height: 1.8; }
.hero-btns { display: flex; gap: 15px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 40px; margin-top: 50px; padding-top: 30px; border-top: 1px solid rgba(255,255,255,0.15); }
.hero-stat .num { font-size: 36px; font-weight: 800; color: #E8832A; }
.hero-stat .label { font-size: 13px; color: rgba(255,255,255,0.6); margin-top: 4px; }
.hero-decoration { position: absolute; right: -50px; top: 50%; transform: translateY(-50%); width: 500px; height: 500px; border: 1px solid rgba(255,255,255,0.06); border-radius: 50%; }
.hero-decoration::after { content: ''; position: absolute; top: 50px; left: 50px; right: 50px; bottom: 50px; border: 1px solid rgba(255,255,255,0.04); border-radius: 50%; }

/* ===== Page Banner  ===== */
.page-banner { margin-top: 75px; padding: 80px 0 60px; background: linear-gradient(135deg, #0d1f33, #1B3A5C); position: relative; overflow: hidden; }
.page-banner::before { content: ''; position: absolute; right: -100px; top: -100px; width: 400px; height: 400px; border: 1px solid rgba(255,255,255,0.05); border-radius: 50%; }
.page-banner h1 { font-size: 36px; color: #fff; font-weight: 700; margin-bottom: 12px; position: relative; z-index: 2; }
.page-banner p { font-size: 16px; color: rgba(255,255,255,0.7); position: relative; z-index: 2; }
.breadcrumb { font-size: 14px; color: rgba(255,255,255,0.5); margin-bottom: 15px; position: relative; z-index: 2; }
.breadcrumb a { color: rgba(255,255,255,0.6); }
.breadcrumb a:hover { color: #E8832A; }
.breadcrumb span { color: #E8832A; }

/* ===== About Section ===== */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-img { position: relative; border-radius: 12px; overflow: hidden; }
.about-img-placeholder { width: 100%; height: 400px; background: linear-gradient(135deg, #e8eef5, #d0dce8); display: flex; align-items: center; justify-content: center; color: #1B3A5C; font-size: 18px; font-weight: 600; border-radius: 12px; }
.about-badge { position: absolute; bottom: -20px; right: -20px; background: #E8832A; color: #fff; padding: 20px 25px; border-radius: 12px; text-align: center; }
.about-badge .num { font-size: 36px; font-weight: 800; }
.about-badge .text { font-size: 13px; }
.about-text .en { font-size: 13px; color: #E8832A; letter-spacing: 3px; font-weight: 600; text-transform: uppercase; }
.about-text h2 { font-size: 30px; color: #1B3A5C; margin: 10px 0 20px; font-weight: 700; line-height: 1.3; }
.about-text p { font-size: 15px; color: #666; line-height: 1.9; margin-bottom: 15px; }
.about-counters { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 30px; }
.counter-item { text-align: center; padding: 20px 10px; background: #f8f9fa; border-radius: 8px; }
.counter-item .num { font-size: 28px; font-weight: 800; color: #1B3A5C; }
.counter-item .unit { font-size: 14px; color: #E8832A; font-weight: 600; }
.counter-item .label { font-size: 12px; color: #888; margin-top: 5px; }

/* ===== products cards ===== */
.solutions-bg { background: #f7f9fc; }
.solution-tabs { display: flex; justify-content: center; gap: 10px; margin-bottom: 40px; flex-wrap: wrap; }
.solution-tab { padding: 10px 24px; border-radius: 25px; font-size: 14px; font-weight: 500; cursor: pointer; transition: all 0.3s; background: #fff; border: 1px solid #e0e0e0; color: #666; }
.solution-tab.active, .solution-tab:hover { background: #1B3A5C; color: #fff; border-color: #1B3A5C; }
.solution-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 25px; }
.solution-card { background: #fff; border-radius: 12px; overflow: hidden; box-shadow: 0 4px 20px rgba(0,0,0,0.06); transition: all 0.4s; }
.solution-card:hover { transform: translateY(-8px); box-shadow: 0 12px 40px rgba(0,0,0,0.12); }
.solution-card-img { height: 250px; background: linear-gradient(135deg, #e8eef5, #c5d5e5); position: relative; overflow: hidden; }
.solution-card-img::after { content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 80px; background: linear-gradient(transparent, rgba(27,58,92,0.8)); }
.solution-card-img .tag { position: absolute; top: 15px; left: 15px; background: #E8832A; color: #fff; padding: 4px 12px; border-radius: 3px; font-size: 12px; font-weight: 600; z-index: 2; }
.solution-card-body { padding: 25px; }
.solution-card-body h3 { font-size: 18px; color: #1B3A5C; margin-bottom: 10px; font-weight: 700; }
.solution-card-body p { font-size: 14px; color: #777; line-height: 1.7; margin-bottom: 15px; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.solution-card-body .more { font-size: 14px; color: #E8832A; font-weight: 600; display: inline-flex; align-items: center; gap: 5px; }
.solution-card-body .more:hover { gap: 10px; }
/* ===== product detail ===== */
.detail-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: start; }
.detail-gallery { position: sticky; top: 95px; }
.detail-main-img { width: 100%; height: 400px; background: linear-gradient(135deg, #e8eef5, #c5d5e5); border-radius: 12px; display: flex; align-items: center; justify-content: center; color: #1B3A5C; font-size: 16px; margin-bottom: 15px; }
.detail-thumbs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.detail-thumb { height: 80px; background: #e8eef5; border-radius: 6px; border: 2px solid transparent; cursor: pointer; transition: all 0.3s; display: flex; align-items: center; justify-content: center; font-size: 11px; color: #888; }
.detail-thumb:hover, .detail-thumb.active { border-color: #E8832A; }
.detail-info .tag { display: inline-block; background: rgba(232,131,42,0.1); color: #E8832A; padding: 4px 12px; border-radius: 3px; font-size: 12px; font-weight: 600; margin-bottom: 12px; }
.detail-info h1 { font-size: 28px; color: #1B3A5C; font-weight: 700; margin-bottom: 15px; line-height: 1.4; }
.detail-info .desc { font-size: 15px; color: #666; line-height: 1.8; margin-bottom: 25px; }

.detail-features { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 30px; }
.detail-feature { display: flex; align-items: center; gap: 8px; font-size: 14px; color: #555; }
.detail-feature::before { content: '✓'; color: #E8832A; font-weight: 700; font-size: 16px; }
.detail-btns { display: flex; gap: 12px; }

/* ===== detail tabs ===== */
.detail-tabs-section { margin-top: 60px; }
.detail-tabs { display: flex; gap: 0; border-bottom: 2px solid #eee; margin-bottom: 30px; flex-wrap: wrap; /* 让标签在窄屏可换行 */ }
.detail-tab { padding: 12px 28px; font-size: 15px; font-weight: 600; color: #888; cursor: pointer; border-bottom: 2px solid transparent; margin-bottom: -2px; transition: all 0.3s; }
.detail-tab.active, .detail-tab:hover { color: #1B3A5C; border-bottom-color: #E8832A; }
.detail-tab-content { font-size: 15px; color: #555; line-height: 1.9; }
.detail-tab-content h3 { font-size: 20px; color: #1B3A5C; margin: 25px 0 15px; font-weight: 700; }
.detail-tab-content p { margin-bottom: 15px; }
.detail-tab-content img {display: block;  margin: 0 auto; max-width: 100%; height: auto;} /* 增强图片自适应 */


/**page list***/
.pagination { margin-top: 40px; display: flex; justify-content: center; gap: 8px; flex-wrap:wrap; }
.pagination a { padding: 8px 16px; border: 1px solid #ddd; border-radius: 4px; color: #666; font-size: 14px; transition: all 0.3s; }
.pagination a.active, .pagination a:hover { background: #1B3A5C; color: #fff; border-color: #1B3A5C; }

/* ===== Advantages  ===== */
.advantages-bg { background: linear-gradient(135deg, #0d1f33, #1B3A5C); }
.advantages-bg .section-title h2 { color: #fff; }
.advantages-bg .section-title .en { color: #E8832A; }
.advantages-bg .section-title p { color: rgba(255,255,255,0.6); }
.advantage-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 25px; }
.advantage-item { background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.1); border-radius: 12px; padding: 30px 20px; text-align: center; transition: all 0.4s; }
.advantage-item:hover { background: rgba(255,255,255,0.1); transform: translateY(-5px); }
.advantage-num { font-size: 36px; font-weight: 800; color: #E8832A; margin-bottom: 12px; }
.advantage-item h3 { font-size: 16px; color: #fff; font-weight: 700; margin-bottom: 10px; }
.advantage-item p { font-size: 13px; color: rgba(255,255,255,0.6); line-height: 1.7; }

/* =====partner ===== */
.partner-tabs { display: flex; justify-content: center; gap: 10px; margin-bottom: 35px; flex-wrap: wrap; }
.partner-tab { padding: 8px 20px; border-radius: 20px; font-size: 13px; cursor: pointer; transition: all 0.3s; background: #f0f0f0; color: #666; border: none; }
.partner-tab.active, .partner-tab:hover { background: #1B3A5C; color: #fff; }
.partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 20px; }
.partner-item { background: #f8f9fa; border-radius: 8px; padding: 25px 15px; text-align: center; font-size: 14px; color: #666; font-weight: 500; transition: all 0.3s; border: 1px solid #eee; }
.partner-item:hover { border-color: #E8832A; color: #1B3A5C; box-shadow: 0 4px 15px rgba(0,0,0,0.06); }

/* =====CASE/ news card ===== */
.sidebar { background: #f8f9fa; border-radius: 12px; padding: 25px; height: fit-content; position: sticky; top: 95px; }
.sidebar h3 { font-size: 18px; color: #1B3A5C; font-weight: 700; margin-bottom: 15px; padding-bottom: 12px; border-bottom: 2px solid #E8832A; }
.sidebar-menu a { display: block; padding: 10px 15px; font-size: 14px; color: #555; border-radius: 6px; margin-bottom: 3px; transition: all 0.3s; }
.sidebar-menu a:hover, .sidebar-menu a.active { background: #1B3A5C; color: #fff; }
.sidebar-contact { margin-top: 25px; background: linear-gradient(135deg, #1B3A5C, #2a5a8c); border-radius: 10px; padding: 25px; text-align: center; color: #fff; }
.sidebar-contact h4 { font-size: 16px; margin-bottom: 10px; }
.sidebar-contact p { font-size: 13px; opacity: 0.8; margin-bottom: 15px; }
.sidebar-contact .phone { font-size: 20px; font-weight: 700; color: #E8832A; }

.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 25px; }
.news-card { background: #fff; border-radius: 12px; overflow: hidden; box-shadow: 0 4px 20px rgba(0,0,0,0.06); transition: all 0.4s; }
.news-card:hover { transform: translateY(-5px); box-shadow: 0 12px 35px rgba(0,0,0,0.12); }
.news-card-img { height: 250px; background: linear-gradient(135deg, #e0e8f0, #c0d0e0); overflow: hidden; }
.news-card-body { padding: 22px; }
.news-card-tag { display: inline-block; background: rgba(232,131,42,0.1); color: #E8832A; font-size: 12px; padding: 3px 10px; border-radius: 3px; margin-bottom: 10px; font-weight: 600; }
.news-card-body h3 { font-size: 16px; color: #1B3A5C; font-weight: 700; margin-bottom: 10px; line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-card-body p { font-size: 14px; color: #888; line-height: 1.7; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin-bottom: 12px; }
.news-card-meta { font-size: 13px; color: #aaa; display: flex; justify-content: space-between; }
.news-sidebar {}
.news-sidebar-widget { background: #f8f9fa; border-radius: 12px; padding: 25px; margin-bottom: 20px; }
.news-sidebar-widget h3 { font-size: 18px; color: #1B3A5C; font-weight: 700; margin-bottom: 15px; padding-bottom: 10px; border-bottom: 2px solid #E8832A; }
/* ===== CTA contact ===== */
.cta-banner { background: linear-gradient(135deg, #E8832A, #d4731e); padding: 50px 0; text-align: center; }
.cta-banner h2 { font-size: 28px; color: #fff; font-weight: 700; margin-bottom: 10px; }
.cta-banner p { font-size: 16px; color: rgba(255,255,255,0.85); margin-bottom: 25px; }
.cta-banner .btn-white { display: inline-block; background: #fff; color: #E8832A; padding: 12px 36px; border-radius: 4px; font-size: 15px; font-weight: 700; transition: all 0.3s; }
.cta-banner .btn-white:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,0.2); }

/* ===== footer ===== */
.footer { background: #0d1f33; padding: 60px 0 0; color: rgba(255,255,255,0.7); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,0.1); }
.footer-brand .logo-text { font-size: 20px; color: #fff; font-weight: 700; margin-bottom: 12px; }
.footer-brand p { font-size: 14px; line-height: 1.8; margin-bottom: 15px; }
.footer-social { display: flex; gap: 10px; }
.footer-social a { width: 36px; height: 36px; background: rgba(255,255,255,0.1); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 14px; color: rgba(255,255,255,0.6); transition: all 0.3s; }
.footer-social a:hover { background: #E8832A; color: #fff; }
.footer-col h4 { font-size: 16px; color: #fff; font-weight: 700; margin-bottom: 18px; }
.footer-col a { display: block; font-size: 14px; color: rgba(255,255,255,0.5); padding: 5px 0; transition: color 0.3s; }
.footer-col a:hover { color: #E8832A; }
.footer-bottom { padding: 20px 0; text-align: center; font-size: 13px; color: rgba(255,255,255,0.35); }

/* ===== new add：产品参数表格样式 ===== */
.detail-params { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 14px; }
.detail-params th, .detail-params td { border: 1px solid #e0e0e0; padding: 12px 15px; text-align: left; }
.detail-params th { background: #1B3A5C; color: #fff; font-weight: 600; }
.detail-params tr:nth-child(even) { background: #f8f9fa; }

/* ===== news list ===== */
.news-layout { display: grid; grid-template-columns: 1fr 300px; gap: 30px; }
.news-list-main {}
.news-filter { display: flex; gap: 10px; margin-bottom: 25px; flex-wrap: wrap; }
.news-filter-btn { padding: 8px 18px; border-radius: 20px; font-size: 13px; cursor: pointer; transition: all 0.3s; background: #f0f0f0; color: #666; border: none; }
.news-filter-btn.active, .news-filter-btn:hover { background: #1B3A5C; color: #fff; }
.news-list-card { display: flex; gap: 25px; background: #fff; border-radius: 12px; padding: 25px; box-shadow: 0 2px 15px rgba(0,0,0,0.05); margin-bottom: 20px; transition: all 0.3s; }
.news-list-card:hover { box-shadow: 0 6px 25px rgba(0,0,0,0.1); transform: translateX(5px); }
.news-list-card-img { width: 260px; min-width: 260px; height: 180px; background: linear-gradient(135deg, #e0e8f0, #c0d0e0); border-radius: 8px; overflow: hidden; display: flex; align-items: center; justify-content: center; color: #1B3A5C; font-size: 13px; }
.news-list-card-body { flex: 1; display: flex; flex-direction: column; }
.news-list-card-body .tag { display: inline-block; background: rgba(232,131,42,0.1); color: #E8832A; font-size: 12px; padding: 3px 10px; border-radius: 3px; margin-bottom: 8px; font-weight: 600; width: fit-content; }
.news-list-card-body h3 { font-size: 18px; color: #1B3A5C; font-weight: 700; margin-bottom: 10px; line-height: 1.5; }
.news-list-card-body p { font-size: 14px; color: #888; line-height: 1.7; flex: 1; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.news-list-card-body .meta { font-size: 13px; color: #aaa; display: flex; gap: 20px; margin-top: 12px; }
.news-sidebar {}
.news-sidebar-widget { background: #f8f9fa; border-radius: 12px; padding: 25px; margin-bottom: 20px; }
.news-sidebar-widget h3 { font-size: 18px; color: #1B3A5C; font-weight: 700; margin-bottom: 15px; padding-bottom: 10px; border-bottom: 2px solid #E8832A; }
.hot-news-item { display: flex; gap: 12px; padding: 12px 0; border-bottom: 1px solid #eee; }
.hot-news-item:last-child { border-bottom: none; }
.hot-news-rank { width: 24px; height: 24px; background: #ddd; color: #fff; border-radius: 4px; display: flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 700; flex-shrink: 0; }
.hot-news-rank.top { background: #E8832A; }
.hot-news-item h4 { font-size: 14px; color: #444; font-weight: 500; line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.hot-news-item h4:hover { color: #E8832A; }

/* ===== news detail  ===== */
.article-wrap { max-width: 900px; margin: 0 auto;text-align: justify; }
.article-header { margin-bottom: 35px; padding-bottom: 25px; border-bottom: 1px solid #eee; }
.article-header h1 { font-size: 28px; color: #1B3A5C; font-weight: 700; line-height: 1.5; margin-bottom: 15px; }
.article-meta { display: flex; gap: 20px; font-size: 14px; color: #aaa; }
.article-body { font-size: 16px; line-height: 2; color: #444; }
.article-body p { margin-bottom: 20px; }
.article-body img{display: block; margin: 0 auto; max-width: 100%; height: auto;} /* 增强图片自适应 */
.article-body h2 { font-size: 22px; color: #1B3A5C; margin: 40px 0 20px; padding-left: 12px; border-left: 4px solid #E8832A; font-weight: 700; }
.article-body blockquote { background: #f8f9fa; padding: 20px 25px; border-left: 4px solid #1B3A5C; margin: 30px 0; color: #666; font-style: italic; border-radius: 0 8px 8px 0; }
.article-body .img-placeholder { width: 100%; height: 350px; background: linear-gradient(135deg, #e0e8f0, #c0d0e0); border-radius: 10px; margin: 30px 0; display: flex; align-items: center; justify-content: center; color: #1B3A5C; font-size: 14px; box-shadow: 0 4px 20px rgba(0,0,0,0.08); }
.article-tags { margin-top: 40px; padding-top: 20px; border-top: 1px solid #eee; display: flex; gap: 10px; flex-wrap: wrap; }
.article-tags span { background: #f0f0f0; color: #666; padding: 5px 14px; border-radius: 15px; font-size: 13px; }
.article-nav { margin-top: 30px; display: flex; justify-content: space-between; padding-top: 20px; border-top: 1px solid #eee; }
.article-nav a { font-size: 14px; color: #1B3A5C; }
.article-nav a:hover { color: #E8832A; }

/* ===== about us===== */
.about-hero { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.timeline { position: relative; padding-left: 30px; margin: 40px 0; }
.timeline::before { content: ''; position: absolute; left: 10px; top: 0; bottom: 0; width: 2px; background: #e0e0e0; }
.timeline-item { position: relative; margin-bottom: 30px; }
.timeline-item::before { content: ''; position: absolute; left: -25px; top: 5px; width: 12px; height: 12px; background: #E8832A; border-radius: 50%; border: 3px solid #fff; box-shadow: 0 0 0 2px #E8832A; }
.timeline-item .year { font-size: 18px; color: #1B3A5C; font-weight: 700; margin-bottom: 5px; }
.timeline-item p { font-size: 14px; color: #666; line-height: 1.7; }
.values-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 25px; margin-top: 30px; }
.value-card { text-align: center; padding: 35px 25px; background: #f8f9fa; border-radius: 12px; transition: all 0.3s; }
.value-card:hover { transform: translateY(-5px); box-shadow: 0 8px 25px rgba(0,0,0,0.08); }
.value-icon { width: 60px; height: 60px; background: linear-gradient(135deg, #1B3A5C, #2a5a8c); border-radius: 50%; margin: 0 auto 15px; display: flex; align-items: center; justify-content: center; font-size: 24px; color: #fff; }
.value-card h3 { font-size: 18px; color: #1B3A5C; font-weight: 700; margin-bottom: 10px; }
.value-card p { font-size: 14px; color: #777; line-height: 1.7; }
.team-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 25px; }
.team-card { text-align: center; }
.team-avatar { width: 100%; height: 250px; background: linear-gradient(135deg, #e8eef5, #d0dce8); border-radius: 12px; margin-bottom: 15px; display: flex; align-items: center; justify-content: center; color: #1B3A5C; font-size: 48px; }
.team-card h3 { font-size: 16px; color: #1B3A5C; font-weight: 700; }
.team-card p { font-size: 13px; color: #888; }

/* ===== contact us ===== */
.contact-biaodan { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; }
.contact-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 25px; margin-bottom: 50px; }
.contact-card { background: #F5F7FA; padding: 30px 20px; border-radius: 8px; text-align: center; transition: all .3s; }
.contact-card:hover { background: #1B3A5C; }
.contact-card:hover h4, .contact-card:hover p { color: #fff; }
.contact-card .icon { width: 50px; height: 50px; background: #E8832A; border-radius: 50%; display: flex; align-items: center; justify-content: center; margin: 0 auto 15px; font-size: 20px; color: #fff; }
.contact-card h4 { font-size: 16px; color: #1B3A5C; margin-bottom: 8px; transition: color .3s; }
.contact-card p { font-size: 14px; color: #777; transition: color .3s; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 14px; color: #555; font-weight: 600; margin-bottom: 6px; }
.form-group input, .form-group textarea, .form-group select { width: 100%; padding: 12px 15px; border: 1px solid #ddd; border-radius: 6px; font-size: 14px; transition: border-color 0.3s; font-family: inherit; }
.form-group input:focus, .form-group textarea:focus, .form-group select:focus { outline: none; border-color: #1B3A5C; }
.form-group textarea { height: 120px; resize: vertical; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
.contact-info-side {}
.contact-info-card { background: linear-gradient(135deg, #1B3A5C, #2a5a8c); border-radius: 12px; padding: 35px; color: #fff; margin-bottom: 20px; }
.contact-info-card h3 { font-size: 22px; font-weight: 700; margin-bottom: 25px; }
.contact-info-item { display: flex; gap: 15px; margin-bottom: 25px; }
.contact-info-icon { width: 45px; height: 45px; background: rgba(255,255,255,0.15); border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 18px; flex-shrink: 0; }
.contact-info-item h4 { font-size: 14px; font-weight: 600; margin-bottom: 4px; opacity: 0.8; }
.contact-info-item p { font-size: 16px; font-weight: 500; }
.map-placeholder { width: 100%; height: 250px; background: #e8eef5; border-radius: 12px; display: flex; align-items: center; justify-content: center; color: #1B3A5C; font-size: 14px; }
/* --- Mobile Bottom Bar --- */
.mobile-bottom-bar { display: none; position: fixed; bottom: 0; left: 0; width: 100%; background: #fff; padding: 8px 15px; box-shadow: 0 -2px 10px rgba(0,0,0,.1); z-index: 999; gap: 10px; }
.mobile-bottom-bar a { flex: 1; text-align: center; padding: 12px; border-radius: 4px; font-size: 14px; font-weight: 600; }
.mobile-bottom-bar .btn-call { background: #1B3A5C; color: #fff; }
.mobile-bottom-bar .btn-quote { background: #E8832A; color: #fff; }

/* ===== zishengying ===== */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: repeat(3, 1fr); }
  .advantage-grid { grid-template-columns: repeat(2, 1fr); }
  .solution-cards, .case-cards, .news-grid { grid-template-columns: repeat(2, 1fr); }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid, .about-hero, .detail-layout, .contact-grid,.contact-biaodan { grid-template-columns: 1fr; }
  .product-layout, .news-layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .hero h1 { font-size: 32px; }
  .process-steps { grid-template-columns: repeat(3, 1fr); }
  .partner-grid { grid-template-columns: repeat(4, 1fr); }
}
@media (max-width: 768px) {
  .nav { display: none; position: absolute; top: 100%; left: 0; width: 100%; background: #fff; flex-direction: column; padding: 15px 20px; box-shadow: 0 10px 20px rgba(0,0,0,.1); z-index: 1000; gap: 0; }
  .nav.active { display: flex; }
  .nav > a, .nav > .dropdown > .dropdown-toggle { width: 100%; padding: 12px 0; border-bottom: 1px solid #f0f0f0; font-size: 15px; text-align: left; }
  .dropdown-menu { position: static; box-shadow: none; opacity: 1; visibility: visible; transform: none; padding-left: 15px; display: none; }
  .dropdown.open .dropdown-menu { display: block; }
  .menu-toggle { display: block; }
  .header .btn-primary { display: none; }
  .hero { min-height: 500px; }
  .hero h1 { font-size: 26px; }
  .hero-stats { flex-wrap: wrap; gap: 20px; }
  .section { padding: 50px 0; }
  .section-title h2 { font-size: 24px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .mobile-bottom-bar { display: flex; }
  .solution-cards, .case-cards, .news-grid, .product-grid { grid-template-columns: 1fr; }
  .advantage-grid { grid-template-columns: 1fr; }
  .about-counters { grid-template-columns: repeat(2, 1fr); }
  .partner-grid { grid-template-columns: repeat(3, 1fr); }
  .values-grid, .team-grid { grid-template-columns: repeat(2, 1fr); }
  .process-steps { grid-template-columns: repeat(2, 1fr); }
  .advantage-cards { grid-template-columns: 1fr; }
  .news-list-card { flex-direction: column; }
  .news-list-card-img { width: 100%; min-width: unset; height: 200px; }
  .form-row { grid-template-columns: 1fr; }
  
  /* mobile product detail */
  .detail-layout { gap: 30px; }
  .detail-gallery { position: static; }
  .detail-main-img { height: 250px; }
  .detail-info h1 { font-size: 22px; }
  .detail-features { grid-template-columns: 1fr; gap: 8px; }
  .detail-tabs { flex-direction: column; border-bottom: none; }
  .detail-tab { border-bottom: 1px solid #eee; margin-bottom: 0; padding: 12px 0; }
  .detail-tab.active { border-bottom-color: #E8832A; }
  .detail-params { font-size: 13px; } /* 小屏下参数表格字体略小 */
  .detail-params th, .detail-params td { padding: 8px 10px; }
}