/* ===== 零度守望 - 清爽浅蓝风格官网样式 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --primary: #2196F3;
    --primary-dark: #1565C0;
    --primary-darker: #0D47A1;
    --primary-light: #64B5F6;
    --primary-lighter: #BBDEFB;
    --accent: #03A9F4;
    --accent-orange: #FF6B00;
    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-gray: #eef2f7;
    --bg-dark: #1a2332;
    --text-dark: #1a1a2e;
    --text-main: #333;
    --text-gray: #666;
    --text-light: #999;
    --text-white: #fff;
    --border: #e0e7ef;
    --shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 8px 30px rgba(33, 150, 243, 0.15);
    --transition: all 0.3s ease;
}

body {
    font-family: "Microsoft YaHei", "PingFang SC", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
    color: var(--text-main);
    line-height: 1.7;
    background: var(--bg-white);
    font-size: 15px;
}

a { text-decoration: none; color: inherit; transition: var(--transition); }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }

/* ===== 顶部信息栏（隐藏，海康风格没有深色条） ===== */
.top-bar {
    display: none;
}

/* ===== 主导航 ===== */
.navbar {
    background: var(--bg-white);
    box-shadow: 0 1px 4px rgba(0,0,0,0.04);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border);
}
.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-dark);
    letter-spacing: 1px;
}
.logo-icon {
    width: 46px;
    height: 46px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
    font-weight: bold;
    box-shadow: 0 4px 12px rgba(33, 150, 243, 0.25);
}
.logo-text small {
    display: block;
    font-size: 11px;
    font-weight: normal;
    color: var(--text-light);
    letter-spacing: 2px;
    margin-top: 2px;
}

.nav-menu { display: flex; gap: 0; }
.nav-item { position: relative; }
.nav-item > a {
    display: block;
    padding: 0 22px;
    line-height: 72px;
    font-size: 16px;
    color: var(--text-main);
    font-weight: 500;
    position: relative;
}
.nav-item > a:hover,
.nav-item > a.active {
    color: var(--primary);
}
.nav-item > a.active::after,
.nav-item > a:hover::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 22px;
    right: 22px;
    height: 3px;
    background: var(--primary);
}

/* 下拉菜单 */
.dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    background: var(--bg-white);
    box-shadow: 0 8px 30px rgba(0,0,0,0.1);
    border-top: 3px solid var(--primary);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    z-index: 999;
}
.nav-item:hover .dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.dropdown li a {
    display: block;
    padding: 14px 20px;
    font-size: 14px;
    color: var(--text-main);
    border-bottom: 1px solid var(--bg-light);
}
.dropdown li:last-child a { border-bottom: none; }
.dropdown li a:hover {
    background: var(--bg-light);
    color: var(--primary);
    padding-left: 26px;
}

.nav-search {
    display: flex;
    align-items: center;
    gap: 16px;
}
.search-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-light);
    border: none;
    cursor: pointer;
    font-size: 16px;
    color: var(--text-gray);
    transition: var(--transition);
}
.search-btn:hover { background: var(--primary); color: white; }

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 26px;
    cursor: pointer;
    color: var(--primary-dark);
}

/* ===== 轮播Banner（淡蓝清爽风格） ===== */
.banner {
    position: relative;
    height: 560px;
    overflow: hidden;
    background: var(--bg-light);
}
.banner-slide {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    opacity: 0;
    transition: opacity 0.8s ease;
    display: flex;
    align-items: center;
}
.banner-slide.active { opacity: 1; }
.banner-slide::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(90deg, rgba(255,255,255,0.9) 0%, rgba(255,255,255,0.5) 40%, transparent 70%);
}
.banner-slide.bg1 {
    background: linear-gradient(135deg, #E3F2FD 0%, #BBDEFB 40%, #90CAF9 100%);
}
.banner-slide.bg2 {
    background: linear-gradient(135deg, #F0F9FF 0%, #E0F2FE 40%, #BAE6FD 100%);
}
.banner-slide.bg3 {
    background: linear-gradient(135deg, #F5F7FF 0%, #E8EDFF 40%, #C7D2FE 100%);
}
.banner-content {
    position: relative;
    z-index: 2;
    color: var(--text-dark);
    max-width: 680px;
}
.banner-tag {
    display: inline-block;
    padding: 6px 18px;
    background: rgba(33, 150, 243, 0.1);
    border: 1px solid var(--primary);
    border-radius: 20px;
    font-size: 14px;
    color: var(--primary-dark);
    margin-bottom: 24px;
    letter-spacing: 1px;
}
.banner-content h1 {
    font-size: 48px;
    font-weight: bold;
    margin-bottom: 20px;
    line-height: 1.3;
    letter-spacing: 1px;
    color: var(--primary-darker);
}
.banner-content p {
    font-size: 18px;
    margin-bottom: 36px;
    color: var(--text-gray);
    line-height: 1.8;
}
.banner-btns { display: flex; gap: 16px; }
.btn {
    display: inline-block;
    padding: 14px 38px;
    border-radius: 4px;
    font-size: 16px;
    font-weight: 500;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    letter-spacing: 1px;
}
.btn-primary {
    background: var(--primary);
    color: white;
}
.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(33, 150, 243, 0.35);
}
.btn-outline {
    background: transparent;
    color: var(--primary-dark);
    border: 1.5px solid var(--primary);
}
.btn-outline:hover {
    background: var(--primary);
    color: white;
}
.btn-blue {
    background: var(--primary);
    color: white;
}
.btn-blue:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

/* 轮播指示器 */
.banner-dots {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 10;
}
.banner-dot {
    width: 40px;
    height: 4px;
    background: rgba(33, 150, 243, 0.2);
    cursor: pointer;
    transition: var(--transition);
    border-radius: 2px;
}
.banner-dot.active {
    background: var(--primary);
    width: 60px;
}
.banner-arrows { display: none; }

/* ===== 通用区块 ===== */
.section { padding: 80px 0; }
.section-header {
    text-align: center;
    margin-bottom: 56px;
}
.section-header h2 {
    font-size: 36px;
    color: var(--primary-dark);
    margin-bottom: 12px;
    font-weight: bold;
    letter-spacing: 1px;
}
.section-header .en {
    font-size: 14px;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 3px;
    margin-bottom: 16px;
}
.section-header .line {
    width: 50px;
    height: 3px;
    background: var(--primary);
    margin: 0 auto;
    border-radius: 2px;
}
.section-header p {
    font-size: 16px;
    color: var(--text-gray);
    margin-top: 20px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* ===== 产品中心 ===== */
.products { background: var(--bg-light); }
.product-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}
.product-tab {
    padding: 10px 28px;
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 15px;
    color: var(--text-gray);
    cursor: pointer;
    transition: var(--transition);
}
.product-tab:hover,
.product-tab.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}
.product-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.product-card {
    background: var(--bg-white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
    border: 1px solid var(--border);
}
.product-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-lighter);
}
.product-img {
    height: 200px;
    background: linear-gradient(135deg, var(--bg-light), var(--primary-lighter));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 64px;
    position: relative;
    overflow: hidden;
}
.product-img::after {
    content: '查看详情 →';
    position: absolute;
    bottom: -40px;
    left: 0; right: 0;
    background: var(--primary);
    color: white;
    text-align: center;
    padding: 10px;
    font-size: 14px;
    transition: var(--transition);
}
.product-card:hover .product-img::after { bottom: 0; }
.product-info { padding: 20px; }
.product-info h3 {
    font-size: 17px;
    color: var(--text-dark);
    margin-bottom: 8px;
    font-weight: 600;
}
.product-info p {
    font-size: 13px;
    color: var(--text-gray);
    line-height: 1.6;
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.product-more {
    font-size: 13px;
    color: var(--primary);
    font-weight: 500;
}
.product-more:hover { color: var(--primary-dark); }

/* ===== 解决方案 ===== */
.solutions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.solution-card {
    position: relative;
    height: 280px;
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    display: flex;
    align-items: flex-end;
    border: 1px solid var(--border);
}
.solution-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(180deg, transparent 30%, rgba(13, 71, 161, 0.85) 100%);
    z-index: 1;
    transition: var(--transition);
}
.solution-card:hover::before {
    background: linear-gradient(180deg, rgba(33, 150, 243, 0.2) 0%, rgba(13, 71, 161, 0.9) 100%);
}
.solution-card.bg1 { background: linear-gradient(135deg, #E3F2FD, #90CAF9); }
.solution-card.bg2 { background: linear-gradient(135deg, #E8F5E9, #A5D6A7); }
.solution-card.bg3 { background: linear-gradient(135deg, #FFF3E0, #FFCC80); }
.solution-card.bg4 { background: linear-gradient(135deg, #F3E5F5, #CE93D8); }
.solution-card.bg5 { background: linear-gradient(135deg, #E0F7FA, #80DEEA); }
.solution-card.bg6 { background: linear-gradient(135deg, #FFFDE7, #FFF59D); }
.solution-icon {
    position: absolute;
    top: 30px;
    left: 30px;
    font-size: 48px;
    z-index: 2;
    opacity: 0.9;
}
.solution-content {
    position: relative;
    z-index: 2;
    padding: 30px;
    color: white;
    width: 100%;
}
.solution-content h3 {
    font-size: 22px;
    margin-bottom: 10px;
    font-weight: 600;
}
.solution-content p {
    font-size: 14px;
    opacity: 0.9;
    margin-bottom: 12px;
}
.solution-content .more {
    font-size: 13px;
    color: #fff;
    opacity: 0;
    transform: translateX(-10px);
    transition: var(--transition);
}
.solution-card:hover .more {
    opacity: 1;
    transform: translateX(0);
}

/* ===== 新闻动态 ===== */
.news { background: var(--bg-light); }
.news-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}
.news-featured {
    background: var(--bg-white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid var(--border);
}
.news-featured:hover { box-shadow: var(--shadow-hover); }
.news-featured-img {
    height: 300px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 80px;
}
.news-featured-content { padding: 28px; }
.news-featured-content .date {
    font-size: 13px;
    color: var(--primary);
    margin-bottom: 10px;
    font-weight: 500;
}
.news-featured-content h3 {
    font-size: 22px;
    color: var(--text-dark);
    margin-bottom: 12px;
    line-height: 1.4;
}
.news-featured-content p {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.7;
}
.news-list { display: flex; flex-direction: column; gap: 0; }
.news-item {
    display: flex;
    gap: 20px;
    padding: 22px 0;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: var(--transition);
}
.news-item:first-child { padding-top: 0; }
.news-item:last-child { border-bottom: none; }
.news-item:hover { padding-left: 8px; }
.news-date {
    flex-shrink: 0;
    width: 70px;
    text-align: center;
    border-right: 2px solid var(--primary);
    padding-right: 16px;
}
.news-date .day {
    font-size: 28px;
    font-weight: bold;
    color: var(--primary-dark);
    line-height: 1;
}
.news-date .month {
    font-size: 12px;
    color: var(--text-light);
    margin-top: 4px;
}
.news-item-content h4 {
    font-size: 16px;
    color: var(--text-dark);
    margin-bottom: 8px;
    font-weight: 600;
    line-height: 1.4;
}
.news-item:hover .news-item-content h4 { color: var(--primary); }
.news-item-content p {
    font-size: 13px;
    color: var(--text-gray);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ===== 服务支持 ===== */
.service {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    color: white;
    position: relative;
    overflow: hidden;
}
.service::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255,255,255,0.1), transparent 70%);
    border-radius: 50%;
}
.service .section-header h2 { color: white; }
.service .section-header p { color: rgba(255,255,255,0.8); }
.service-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    position: relative;
    z-index: 2;
}
.service-card {
    text-align: center;
    padding: 36px 24px;
    background: rgba(255,255,255,0.08);
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.15);
    transition: var(--transition);
    cursor: pointer;
}
.service-card:hover {
    background: rgba(255,255,255,0.15);
    border-color: rgba(255,255,255,0.3);
    transform: translateY(-6px);
}
.service-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 20px;
    background: rgba(255,255,255,0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
}
.service-card h3 {
    font-size: 18px;
    margin-bottom: 10px;
    font-weight: 600;
}
.service-card p {
    font-size: 13px;
    opacity: 0.85;
    line-height: 1.7;
}

/* ===== 关于我们 ===== */
.about-section { padding: 80px 0; }
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.about-img {
    height: 450px;
    background: linear-gradient(135deg, var(--primary-lighter), var(--primary-light));
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 120px;
    position: relative;
    overflow: hidden;
}
.about-img::after {
    content: '';
    position: absolute;
    bottom: -30px;
    right: -30px;
    width: 200px;
    height: 200px;
    border: 6px solid var(--primary);
    border-radius: 8px;
    opacity: 0.3;
}
.about-text h2 {
    font-size: 32px;
    color: var(--primary-dark);
    margin-bottom: 20px;
    font-weight: bold;
}
.about-text .lead {
    font-size: 17px;
    color: var(--primary);
    margin-bottom: 24px;
    font-weight: 500;
    line-height: 1.6;
}
.about-text p {
    font-size: 15px;
    color: var(--text-gray);
    line-height: 1.9;
    margin-bottom: 16px;
}
.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 32px;
    padding-top: 32px;
    border-top: 1px solid var(--border);
}
.stat-item .num {
    font-size: 36px;
    font-weight: bold;
    color: var(--primary);
    line-height: 1;
}
.stat-item .num span { font-size: 18px; }
.stat-item .label {
    font-size: 13px;
    color: var(--text-gray);
    margin-top: 8px;
}

/* ===== 内页Banner ===== */
.page-banner {
    height: 320px;
    background: linear-gradient(135deg, #E3F2FD, #BBDEFB);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--text-dark);
    position: relative;
    overflow: hidden;
}
.page-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(33,150,243,0.15), transparent 70%);
    border-radius: 50%;
}
.page-banner-content { position: relative; z-index: 2; }
.page-banner h1 {
    font-size: 40px;
    margin-bottom: 12px;
    font-weight: bold;
    letter-spacing: 2px;
    color: var(--primary-darker);
}
.page-banner p {
    font-size: 16px;
    color: var(--text-gray);
    letter-spacing: 1px;
}
.breadcrumb {
    margin-top: 20px;
    font-size: 14px;
    color: var(--text-gray);
}
.breadcrumb a { color: var(--primary); }
.breadcrumb span { margin: 0 8px; }

/* ===== 产品列表页 ===== */
.product-list-section { padding: 60px 0; }
.product-category {
    margin-bottom: 50px;
}
.product-category h3 {
    font-size: 24px;
    color: var(--primary-dark);
    margin-bottom: 24px;
    padding-left: 14px;
    border-left: 4px solid var(--primary);
}

/* ===== 联系我们 ===== */
.contact-section { padding: 80px 0; }
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 50px;
}
.contact-info h3 {
    font-size: 26px;
    color: var(--primary-dark);
    margin-bottom: 30px;
}
.contact-item {
    display: flex;
    gap: 18px;
    margin-bottom: 28px;
    align-items: flex-start;
}
.contact-item-icon {
    width: 52px;
    height: 52px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: white;
    flex-shrink: 0;
}
.contact-item-text h4 {
    font-size: 17px;
    color: var(--primary-dark);
    margin-bottom: 6px;
}
.contact-item-text p {
    font-size: 15px;
    color: var(--text-gray);
    line-height: 1.6;
}
.contact-form-wrap {
    background: var(--bg-white);
    padding: 40px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}
.contact-form-wrap h3 {
    font-size: 24px;
    color: var(--primary-dark);
    margin-bottom: 30px;
}
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
.form-group { margin-bottom: 20px; }
.form-group label {
    display: block;
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 8px;
    font-weight: 500;
}
.form-group label .required { color: var(--accent-orange); margin-left: 4px; }
.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    transition: var(--transition);
    font-family: inherit;
    background: var(--bg-white);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}
.form-group textarea { resize: vertical; min-height: 120px; }

/* ===== 页脚 ===== */
.footer {
    background: var(--bg-dark);
    color: rgba(255,255,255,0.7);
    padding-top: 60px;
}
.footer-top {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 50px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand h3 {
    font-size: 22px;
    color: white;
    margin-bottom: 18px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.footer-brand p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 20px;
}
.footer-contact p {
    font-size: 14px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.footer-contact i { color: var(--primary-light); }
.footer-col h4 {
    font-size: 16px;
    color: white;
    margin-bottom: 20px;
    font-weight: 600;
}
.footer-col ul li {
    margin-bottom: 12px;
}
.footer-col ul li a {
    font-size: 14px;
    color: rgba(255,255,255,0.6);
    transition: var(--transition);
}
.footer-col ul li a:hover {
    color: var(--primary-light);
    padding-left: 4px;
}
.footer-bottom {
    padding: 24px 0;
    text-align: center;
    font-size: 13px;
    color: rgba(255,255,255,0.5);
}
.footer-bottom a { color: rgba(255,255,255,0.5); }
.footer-bottom a:hover { color: var(--primary-light); }
.footer-bottom .sep { margin: 0 12px; }

/* ===== 回到顶部 ===== */
.back-top {
    position: fixed;
    bottom: 40px;
    right: 40px;
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: white;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    box-shadow: 0 4px 12px rgba(33, 150, 243, 0.3);
}
.back-top.show { opacity: 1; visibility: visible; }
.back-top:hover { background: var(--primary-dark); transform: translateY(-3px); }

/* ===== 响应式 ===== */
@media (max-width: 1100px) {
    .container { padding: 0 20px; }
    .product-grid { grid-template-columns: repeat(3, 1fr); }
    .footer-top { grid-template-columns: 1fr 1fr 1fr; }
    .footer-brand { grid-column: 1 / -1; }
    .nav-item > a { padding: 0 16px; font-size: 15px; }
}

/* ===== 平板及以下（≤900px）===== */
@media (max-width: 900px) {
    .container { padding: 0 16px; }

    /* 导航栏 */
    .navbar .container { height: 60px; }
    .logo { font-size: 20px; }
    .logo-icon { width: 38px; height: 38px; font-size: 16px; }
    .nav-menu { display: none; }
    .mobile-toggle { display: block; font-size: 22px; }
    .nav-search { gap: 4px; }
    .search-btn { width: 34px; height: 34px; font-size: 14px; }
    .nav-icon-btn { width: 34px; height: 34px; margin-left: 0; }
    .nav-icon-btn svg { width: 17px; height: 17px; }

    /* 移动端展开菜单 */
    .nav-menu.show {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 60px;
        left: 0; right: 0;
        background: white;
        box-shadow: 0 8px 24px rgba(0,0,0,0.1);
        padding: 8px 0;
        max-height: calc(100vh - 60px);
        overflow-y: auto;
    }
    .nav-item > a { line-height: 48px; padding: 0 20px; font-size: 15px; border-bottom: 1px solid #f5f7fa; }
    .nav-item > a.active::after, .nav-item > a:hover::after { display: none; }
    .dropdown {
        position: static;
        box-shadow: none;
        border-top: none;
        opacity: 1;
        visibility: visible;
        transform: none;
        display: none;
        background: #fafbfc;
    }
    .nav-item.open .dropdown { display: block; }
    .nav-item > a.has-sub::after {
        content: '▾';
        float: right;
        font-size: 12px;
        color: #999;
        transition: transform 0.3s;
    }
    .nav-item.open > a.has-sub::after { transform: rotate(180deg); }
    .dropdown li a { padding: 10px 20px 10px 36px; font-size: 14px; border-bottom: 1px solid #f0f2f5; }
    .dropdown li a:hover { padding-left: 40px; background: #f0f7ff; }

    /* Banner */
    .banner { height: 400px; }
    .banner-content { max-width: 100%; padding: 0 10px; }
    .banner-tag { font-size: 12px; padding: 5px 14px; margin-bottom: 16px; }
    .banner-content h1 { font-size: 28px; margin-bottom: 14px; }
    .banner-content p { font-size: 14px; margin-bottom: 24px; }
    .btn { padding: 11px 28px; font-size: 14px; }
    .banner-dots { bottom: 20px; }

    /* 通用区块 */
    .section { padding: 50px 0; }
    .section-header { margin-bottom: 36px; }
    .section-header .en { font-size: 12px; margin-bottom: 10px; }
    .section-header h2 { font-size: 24px; margin-bottom: 10px; }
    .section-header p { font-size: 14px; margin-top: 14px; }

    /* 产品 */
    .product-tabs { gap: 6px; margin-bottom: 28px; }
    .product-tab { padding: 8px 18px; font-size: 13px; }
    .product-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
    .product-img { height: 150px; font-size: 48px; }
    .product-info { padding: 14px; }
    .product-info h3 { font-size: 15px; margin-bottom: 6px; }
    .product-info p { font-size: 12px; margin-bottom: 8px; }
    .product-more { font-size: 12px; }

    /* 解决方案 */
    .solutions-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
    .solution-card { height: 220px; }
    .solution-icon { top: 20px; left: 20px; font-size: 36px; }
    .solution-content { padding: 20px; }
    .solution-content h3 { font-size: 18px; margin-bottom: 8px; }
    .solution-content p { font-size: 12px; margin-bottom: 8px; }

    /* 服务支持 */
    .service-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
    .service-card { padding: 24px 16px; }
    .service-icon { width: 56px; height: 56px; font-size: 24px; margin-bottom: 14px; }
    .service-card h3 { font-size: 16px; margin-bottom: 8px; }
    .service-card p { font-size: 12px; }

    /* 关于我们 */
    .about-grid { grid-template-columns: 1fr; gap: 30px; }
    .about-img { height: 240px; font-size: 80px; }
    .about-text h2 { font-size: 24px; margin-bottom: 14px; }
    .about-text .lead { font-size: 15px; margin-bottom: 16px; }
    .about-text p { font-size: 14px; margin-bottom: 12px; }
    .about-stats { gap: 14px; margin-top: 24px; padding-top: 24px; }
    .stat-item .num { font-size: 28px; }
    .stat-item .num span { font-size: 14px; }
    .stat-item .label { font-size: 12px; margin-top: 6px; }

    /* 新闻 */
    .news-grid { grid-template-columns: 1fr; gap: 24px; }
    .news-featured-img { height: 200px; font-size: 56px; }
    .news-featured-content { padding: 20px; }
    .news-featured-content h3 { font-size: 18px; }
    .news-item { gap: 14px; padding: 16px 0; }
    .news-date { width: 56px; padding-right: 12px; }
    .news-date .day { font-size: 22px; }
    .news-item-content h4 { font-size: 14px; }

    /* 联系我们 */
    .contact-grid { grid-template-columns: 1fr; gap: 30px; }
    .contact-info h3 { font-size: 22px; margin-bottom: 20px; }
    .contact-item { gap: 14px; margin-bottom: 20px; }
    .contact-item-icon { width: 44px; height: 44px; font-size: 18px; }
    .contact-item-text h4 { font-size: 15px; }
    .contact-item-text p { font-size: 14px; }
    .contact-form-wrap { padding: 24px; }
    .contact-form-wrap h3 { font-size: 20px; margin-bottom: 20px; }
    .form-row { grid-template-columns: 1fr; gap: 0; }

    /* 内页Banner */
    .page-banner { height: 220px; }
    .page-banner h1 { font-size: 28px; margin-bottom: 8px; }
    .page-banner p { font-size: 13px; }
    .breadcrumb { margin-top: 14px; font-size: 12px; }

    /* 产品列表页 */
    .product-list-section { padding: 40px 0; }
    .product-category { margin-bottom: 36px; }
    .product-category h3 { font-size: 20px; margin-bottom: 18px; padding-left: 10px; }

    /* 页脚 */
    .footer { padding-top: 40px; }
    .footer-top { grid-template-columns: 1fr 1fr; gap: 28px; padding-bottom: 36px; }
    .footer-brand { grid-column: 1 / -1; }
    .footer-brand h3 { font-size: 18px; margin-bottom: 12px; }
    .footer-brand p { font-size: 13px; margin-bottom: 14px; }
    .footer-contact p { font-size: 13px; margin-bottom: 8px; }
    .footer-col h4 { font-size: 14px; margin-bottom: 14px; }
    .footer-col ul li { margin-bottom: 8px; }
    .footer-col ul li a { font-size: 13px; }
    .footer-bottom { padding: 18px 0; font-size: 12px; line-height: 1.8; }
    .footer-bottom .sep { margin: 0 6px; }

    /* 回到顶部 */
    .back-top { width: 40px; height: 40px; bottom: 20px; right: 20px; font-size: 16px; }
}

/* ===== 手机（≤600px）===== */
@media (max-width: 600px) {
    .container { padding: 0 14px; }

    /* 导航栏 */
    .navbar .container { height: 54px; }
    .logo { font-size: 18px; gap: 8px; }
    .logo-icon { width: 34px; height: 34px; font-size: 14px; border-radius: 5px; }
    .nav-search { gap: 2px; }
    .search-btn { width: 30px; height: 30px; font-size: 13px; background: transparent; }
    .nav-icon-btn { width: 30px; height: 30px; }
    .nav-icon-btn svg { width: 15px; height: 15px; }
    .mobile-toggle { font-size: 20px; }
    .nav-menu.show { top: 54px; }
    .nav-item > a { line-height: 44px; padding: 0 16px; font-size: 14px; }
    .dropdown li a { padding: 8px 16px 8px 30px; font-size: 13px; }

    /* Banner */
    .banner { height: 320px; }
    .banner-content h1 { font-size: 22px; line-height: 1.4; }
    .banner-content p { font-size: 13px; line-height: 1.7; }
    .banner-btns { flex-direction: column; gap: 10px; }
    .banner-btns .btn { width: 100%; text-align: center; }
    .banner-dots { bottom: 16px; gap: 6px; }
    .banner-dot { width: 28px; height: 3px; }
    .banner-dot.active { width: 40px; }

    /* 通用区块 */
    .section { padding: 40px 0; }
    .section-header { margin-bottom: 28px; }
    .section-header h2 { font-size: 22px; }
    .section-header p { font-size: 13px; }

    /* 产品 */
    .product-tabs { gap: 4px; }
    .product-tab { padding: 7px 14px; font-size: 12px; }
    .product-grid { grid-template-columns: 1fr; gap: 12px; }
    .product-img { height: 180px; }

    /* 解决方案 */
    .solutions-grid { grid-template-columns: 1fr; gap: 12px; }
    .solution-card { height: 200px; }

    /* 服务支持 */
    .service-grid { grid-template-columns: 1fr; gap: 12px; }

    /* 关于我们 */
    .about-img { height: 200px; font-size: 64px; }
    .about-stats { grid-template-columns: repeat(2, 1fr); gap: 12px; }

    /* 联系我们 */
    .contact-form-wrap { padding: 20px; }
    .form-group { margin-bottom: 16px; }
    .form-group input, .form-group textarea, .form-group select { padding: 10px 14px; font-size: 13px; }

    /* 内页Banner */
    .page-banner { height: 180px; }
    .page-banner h1 { font-size: 24px; }
    .page-banner p { font-size: 12px; }
    .breadcrumb { font-size: 11px; margin-top: 10px; }

    /* 页脚 */
    .footer-top { grid-template-columns: 1fr; gap: 24px; }
    .footer-bottom { font-size: 11px; padding: 14px 0; }
    .footer-bottom .sep { display: none; }
    .footer-bottom p span { display: block; margin: 4px 0; }

    /* 回到顶部 */
    .back-top { width: 36px; height: 36px; bottom: 16px; right: 16px; font-size: 14px; border-radius: 5px; }
}

/* ===== 超小屏（≤380px）===== */
@media (max-width: 380px) {
    .logo { font-size: 16px; }
    .logo-icon { width: 30px; height: 30px; font-size: 13px; }
    .banner-content h1 { font-size: 20px; }
    .section-header h2 { font-size: 20px; }
}