/* ==================== 全局基础 ==================== */
:root {
    --primary: #005da9;
    --primary-dark: #003d99;
    --primary-light: #e6f0ff;
    --accent: #ff6b00;
    --accent-light: #fff3e6;
    --white: #ffffff;
    --bg-dark: #0a1628;
    --bg-gray: #f5f7fa;
    --text-dark: #1a1a2e;
    --text-gray: #666;
    --text-light: #999;
    --border: #e0e0e0;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.15);
    --radius: 8px;
    --radius-lg: 16px;
    --transition: 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: var(--text-dark);
    background: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* ==================== 滚动动画 ==================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ==================== Header（浮动在Banner上） ==================== */
.header {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: transparent;
    transition: background 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.header.scrolled {
    background: rgba(10, 22, 40, 0.9);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.logo img {
    height: 80px;
    width: auto;
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: var(--white);
    font-size: 15px;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    letter-spacing: 2px;
    line-height: 1;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-cn {
    font-size: 16px;
    font-weight: 700;
    color: var(--white);
    line-height: 1.3;
}

.logo-en {
    font-size: 10px;
    color: rgba(255, 255, 255, 0.7);
    letter-spacing: 0.5px;
    line-height: 1.3;
}

.nav-menu {
    display: flex;
    align-items: center;
    margin-left: auto;
}

.nav-item {
    position: relative;
}

.nav-item > a {
    display: block;
    padding: 0 18px;
    font-size: 15px;
    color: var(--white);
    font-weight: 500;
    transition: var(--transition);
    height: 80px;
    line-height: 80px;
    position: relative;
    opacity: 0.9;
}

.nav-item > a i {
    font-size: 10px;
    margin-left: 4px;
}

.nav-item > a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: #006abe;
    transition: width 0.3s ease;
}

.nav-item:hover > a,
.nav-item.active > a {
    color: var(--white);
    opacity: 1;
}

.nav-item:hover > a::after,
.nav-item.active > a::after {
    width: 100%;
}

.header.scrolled .logo-cn {
    color: var(--white);
}

.header.scrolled .logo-en {
    color: rgba(255, 255, 255, 0.7);
}

.header.scrolled .nav-item > a {
    color: var(--white);
}

.header.scrolled .nav-item > a::after {
    background: #006abe;
}

.header.scrolled .nav-search {
    color: var(--white);
}

.nav-search {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--white);
    transition: var(--transition);
    border-radius: 50%;
    margin-left: 8px;
    opacity: 0.9;
    position: relative;
}

.nav-search:hover {
    color: var(--accent);
    background: rgba(255, 255, 255, 0.15);
    opacity: 1;
}

.nav-search.active {
    opacity: 1;
    background: rgba(255, 255, 255, 0.15);
}

/* 搜索下拉框 */
.search-dropdown {
    position: absolute;
    top: calc(100% + 12px);
    right: 0;
    width: 320px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.3s ease;
    z-index: 1000;
    padding: 12px;
}

.search-dropdown::before {
    content: '';
    position: absolute;
    top: -6px;
    right: 14px;
    width: 12px;
    height: 12px;
    background: #fff;
    transform: rotate(45deg);
    box-shadow: -2px -2px 4px rgba(0, 0, 0, 0.05);
}

.nav-search.active .search-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.search-dropdown form {
    display: flex;
    align-items: center;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    overflow: hidden;
    transition: border-color 0.3s;
}

.search-dropdown form:focus-within {
    border-color: #005da9;
}

.search-dropdown input[type="search"] {
    flex: 1;
    border: none;
    outline: none;
    padding: 10px 14px;
    font-size: 14px;
    color: #333;
    background: transparent;
}

.search-dropdown input[type="search"]::placeholder {
    color: #aaa;
}

.search-dropdown button {
    flex-shrink: 0;
    border: none;
    background: #005da9;
    color: #fff;
    padding: 10px 16px;
    cursor: pointer;
    transition: background 0.3s;
    font-size: 14px;
}

.search-dropdown button:hover {
    background: #004a8a;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--white);
    backdrop-filter: blur(10px);
    min-width: 140px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    border-radius: var(--radius);
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: all 0.3s ease;
    z-index: 100;
    padding: 8px 0;
}

.dropdown-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li a {
    display: block;
    padding: 10px 18px;
    font-size: 14px;
    color: #111111;
    transition: var(--transition);
    white-space: nowrap;
}

.dropdown-menu li a:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #006abe;
    padding-left: 22px;
}

.mobile-toggle {
    display: none;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 20px;
    color: var(--white);
}

.mobile-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 998;
}

.mobile-overlay.show {
    display: block;
}

/* ==================== Banner ==================== */
.banner {
    position: relative;
    height: 100vh;
    min-height: 600px;
    overflow: hidden;
    margin-top: 0;
}

.banner-track {
    position: relative;
    width: 100%;
    height: 100%;
}

.banner-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.8s ease;
    z-index: 1;
}

.banner-slide.active {
    opacity: 1;
    z-index: 2;
}

.banner-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
}

.banner-bg-1 {
    background: linear-gradient(135deg, rgba(10, 22, 40, 0.75) 0%, rgba(26, 58, 92, 0.7) 30%, rgba(0, 82, 204, 0.65) 60%, rgba(0, 61, 153, 0.75) 100%),
    url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="1200" height="600" viewBox="0 0 1200 600"><rect fill="%231a3a5c" width="1200" height="600"/><g opacity="0.15"><rect x="100" y="200" width="180" height="120" rx="4" fill="%234a9eff"/><rect x="320" y="150" width="140" height="90" rx="4" fill="%234a9eff"/><circle cx="600" cy="300" r="80" fill="%234a9eff"/><rect x="750" y="220" width="200" height="140" rx="4" fill="%234a9eff"/><rect x="950" y="180" width="120" height="80" rx="4" fill="%234a9eff"/><line x1="0" y1="350" x2="1200" y2="350" stroke="%236bb5ff" stroke-width="2"/><rect x="400" y="370" width="300" height="60" rx="2" fill="%236bb5ff"/></g></svg>');
    background-size: cover;
}

.banner-bg-2 {
    background: linear-gradient(135deg, rgba(10, 22, 40, 0.8) 0%, rgba(0, 82, 204, 0.6) 50%, rgba(0, 61, 153, 0.7) 100%),
    url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="1200" height="600" viewBox="0 0 1200 600"><rect fill="%230a1628" width="1200" height="600"/><g opacity="0.12"><rect x="50" y="100" width="200" height="300" rx="6" fill="%230052cc"/><rect x="280" y="200" width="150" height="200" rx="4" fill="%230052cc"/><circle cx="600" cy="250" r="100" fill="%230052cc"/><rect x="700" y="150" width="250" height="250" rx="6" fill="%230052cc"/><rect x="970" y="180" width="180" height="220" rx="4" fill="%230052cc"/></g></svg>');
    background-size: cover;
}

.banner-bg-3 {
    background: linear-gradient(135deg, rgba(10, 22, 40, 0.85) 0%, rgba(0, 82, 204, 0.55) 40%, rgba(255, 107, 0, 0.4) 100%),
    url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="1200" height="600" viewBox="0 0 1200 600"><rect fill="%230a1628" width="1200" height="600"/><g opacity="0.1"><circle cx="400" cy="200" r="120" fill="%23ff6b00"/><circle cx="800" cy="300" r="80" fill="%230052cc"/><rect x="200" y="350" width="300" height="100" rx="4" fill="%23ff6b00"/><rect x="600" y="380" width="400" height="80" rx="4" fill="%230052cc"/></g></svg>');
    background-size: cover;
}

.banner-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 800 400"><circle cx="50" cy="50" r="2" fill="rgba(255,255,255,0.3)"/><circle cx="150" cy="30" r="1.5" fill="rgba(255,255,255,0.2)"/><circle cx="250" cy="70" r="1" fill="rgba(255,255,255,0.25)"/><circle cx="350" cy="40" r="2" fill="rgba(255,255,255,0.15)"/><circle cx="450" cy="80" r="1.5" fill="rgba(255,255,255,0.3)"/><circle cx="550" cy="20" r="1" fill="rgba(255,255,255,0.2)"/><circle cx="650" cy="60" r="2" fill="rgba(255,255,255,0.25)"/><circle cx="750" cy="35" r="1.5" fill="rgba(255,255,255,0.15)"/><circle cx="100" cy="150" r="1" fill="rgba(255,255,255,0.3)"/><circle cx="200" cy="130" r="2" fill="rgba(255,255,255,0.2)"/><circle cx="300" cy="170" r="1.5" fill="rgba(255,255,255,0.25)"/><circle cx="400" cy="140" r="1" fill="rgba(255,255,255,0.15)"/><circle cx="500" cy="180" r="2" fill="rgba(255,255,255,0.3)"/><circle cx="600" cy="120" r="1.5" fill="rgba(255,255,255,0.2)"/><circle cx="700" cy="160" r="1" fill="rgba(255,255,255,0.25)"/><circle cx="800" cy="140" r="2" fill="rgba(255,255,255,0.15)"/></svg>') repeat;
    opacity: 0.4;
    animation: particleFloat 20s linear infinite;
}

@keyframes particleFloat {
    0% {
        transform: translate(0, 0);
    }
    100% {
        transform: translate(-200px, -100px);
    }
}

.banner-content {
    position: relative;
    z-index: 3;
    height: 100%;
    display: flex;
    align-items: center;
}

.banner-text {
    max-width: 600px;
    animation: fadeInUp 0.8s ease 0.2s both;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.banner-subtitle {
    font-size: 20px;
    color: var(--white);
    font-weight: 600;
    margin-bottom: 10px;
    letter-spacing: 3px;
}

.banner-title {
    font-size: 56px;
    font-weight: 700;
    color: var(--white);
    line-height: 1.2;
    margin-bottom: 30px;
    letter-spacing: 2px;
}

.banner-btn-circle {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 0;
    background: none;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.btn-text {
    font-size: 16px;
    color: var(--white);
    font-weight: 500;
    letter-spacing: 2px;
}

.btn-arrow {
    width: 44px;
    height: 44px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 16px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.btn-arrow::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: 0.6s;
}

.banner-btn-circle:hover .btn-arrow {
    background: var(--accent);
    transform: scale(1.1);
    box-shadow: 0 4px 20px rgba(255, 107, 0, 0.5);
}

.banner-btn-circle:hover .btn-arrow::before {
    left: 100%;
}

.banner-btn-circle:hover .btn-text {
    color: var(--accent);
}

.banner .container {
    height: 100%;
    position: relative;
}

.banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10;
    pointer-events: none;
}

.banner-overlay .container {
    height: 100%;
    position: relative;
    pointer-events: none;
}

.banner-overlay .banner-controls-left,
.banner-overlay .scroll-down {
    pointer-events: auto;
    position: absolute;
    bottom: 40px;
}

.banner-arrow i {
    font-weight: 700;
}

.banner-overlay .banner-controls-left {
    left: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    color: #fff;
}

.banner-overlay .scroll-down {
    right: 20px;
    text-align: center;
    animation: bounce 2s ease-in-out infinite;
}

.banner-arrow:hover {
    transform: scale(1.1);
}

.banner-dots {
    display: flex;
    gap: 8px;
    align-items: center;
}

.banner-dots .dot {
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: #005da9;
    cursor: pointer;
    transition: var(--transition);
}

.banner-dots .dot:hover {
    background: #005da9;
}

.banner-dots .dot.active {
    background: #005da9;
    width: 16px;
    border-radius: 5px;
}

.scroll-down {
    position: absolute;
    bottom: 40px;
    right: 40px;
    z-index: 10;
    text-align: center;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.scroll-circle {
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 14px;
    margin-bottom: 6px;
}

.scroll-down span {
    font-size: 11px;
    color: var(--white);
    letter-spacing: 2px;
    text-transform: uppercase;
}

/* ==================== 通用区块标题 ==================== */
.section-header {
    margin-bottom: 40px;
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-dark);
    position: relative;
    display: inline-block;
}

.section-subtitle {
    font-size: 14px;
    color: #1a1a1a;
    margin-top: 10px;
}

/* ==================== 产品中心 ==================== */
.products {
    padding: 80px 0 0;
    background: #f8f9fa;
}

.product-header-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 40px;
    gap: 40px;
}

.product-header-left {
    flex-shrink: 0;
}

.product-header-left .section-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 10px;
}

.product-header-left .section-subtitle {
    font-size: 14px;
}

.product-header-right {
    flex: 1;
}

.product-tabs {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.tab-item {
    padding: 8px 20px;
    background: #f5f5f5;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 14px;
    color: #666;
    border-left: 3px solid transparent;
}

.tab-item:hover {
    background: #e8f4fd;
    color: #005da9;
}

.tab-item.active {
    background: #e8f4fd;
    color: #005da9;
    border-left-color: #005da9;
    font-weight: 600;
}

.sub-categories-container {
    min-height: 30px;
}

.sub-cat-list {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    align-items: center;
}

.sub-cat-list::before {
    content: "◆";
    color: #005da9;
    font-size: 8px;
    margin-right: 4px;
}

.sub-cat {
    position: relative;
}

.sub-cat:not(:last-child)::after {
    content: "◆";
    color: #999;
    font-size: 8px;
    margin-left: 8px;
}

.sub-cat a {
    font-size: 13px;
    color: #666;
    text-decoration: none;
    padding: 4px 8px;
    transition: all 0.3s ease;
}

.sub-cat a:hover {
    color: #005da9;
}

.product-grid {
    display: flex;
    gap: 0;
    min-height: 680px;
    position: relative;
    overflow: hidden;
    background: url("../img/product_bg.png") center center no-repeat;
    background-size: cover;
}

.product-grid::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: #000000;
    opacity: 0.3;
    z-index: 1;
    pointer-events: none;
}

.product-card {
    position: relative;
    overflow: hidden;
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    min-height: 680px;
    flex: 1;
    min-width: 0;
    padding: 50px 40px;
    z-index: 1;
}

.product-card .card-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.product-card.active {
    flex: 1.8;
}

.product-card.active .card-bg {
    background: linear-gradient(260deg, #15337b 0%, #10265b 50%, #0a193b 100%);
    opacity: 0.8;
}

.product-card:not(.active) .card-bg {
    background: linear-gradient(260deg, #303538 0%, #4f575c 50%, #656f77 100%);
    opacity: 0.8;
}

.product-card:hover {
    flex: 1.8;
}

.product-card:hover .card-bg {
    background: linear-gradient(180deg, #15337b 0%, #10265b 50%, #0a193b 100%);
}

.card-top {
    position: relative;
    z-index: 2;
    padding: 0;
    color: #fff;
    margin-bottom: 30px;
}

.card-title {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: 1px;
}

.card-sub {
    font-size: 14px;
    opacity: 0.85;
    line-height: 1.8;
    letter-spacing: 0.5px;
}

.card-line {
    width: 100%;
    height: 1px;
    background: rgba(255, 255, 255, 0.3);
    margin-top: 25px;
    transition: all 0.3s ease;
}

.product-card.active .card-line,
.product-card:hover .card-line {
    background: rgba(255, 255, 255, 0.8);
    height: 2px;
}

.spec-row {
    font-size: 13px;
    line-height: 2;
    margin-bottom: 300px;
    opacity: 0.9;
    color: #fff;
}

.card-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    background: #0066cc;
    color: #fff;
    text-decoration: none;
    border-radius: 2px;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
    letter-spacing: 0.5px;
    position: relative;
    z-index: 2;
}

.card-btn:hover {
    background: #0052a3;
    transform: translateX(5px);
}

.card-btn i {
    font-size: 12px;
    transition: transform 0.3s ease;
}

.card-btn:hover i {
    transform: translateX(3px);
}

.bottom-img {
    position: absolute;
    bottom: 80px;
    right: 40px;
    z-index: 2;
    width: 55%;
    max-width: 300px;
    opacity: 0.85;
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.product-card.active .bottom-img,
.product-card:hover .bottom-img {
    opacity: 1;
    transform: scale(1.08) translateY(-10px);
}

.bottom-img img {
    width: 100%;
    height: auto;
    display: block;
    filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.3));
}

.card-bottom {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 2;
    padding: 0 50px 50px;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.4s ease;
}

.product-card.active .card-bottom,
.product-card:hover .card-bottom {
    opacity: 1;
    transform: translateY(0);
}

/* ==================== 企业优势 ==================== */
.advantages {
    padding: 80px 0 0;
    background: url("../img/advantages_bg.jpg") center/cover no-repeat;
    position: relative;
}

.cert-carousel {
    margin-top: 40px;
    position: relative;
    overflow: hidden;
}

.cert-wrapper {
    overflow: hidden;
    width: 100%;
}

.cert-track {
    display: flex;
    transition: transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    will-change: transform;
}

.cert-item {
    background: url("../img/cert_bg.jpg") center center no-repeat;
    background-size: contain;
    padding: 25px 30px 30px;
    text-align: center;
    width: 250px;
    min-width: 250px;
    height: 308px;
    min-height: 308px;
    margin: 0 5px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    flex-shrink: 0;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.cert-item img {
    height: auto;
    position: relative;
    z-index: 2;
}

.cert-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.cert-item::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent 40%, rgba(255, 255, 255, 0.05) 50%, transparent 60%);
    animation: sheen 3s ease-in-out infinite;
    z-index: 3;
    pointer-events: none;
}

@keyframes sheen {
    0% {
        transform: translateX(-100%) rotate(0deg);
    }
    100% {
        transform: translateX(100%) rotate(0deg);
    }
}

.carousel-dots {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin: 24px 0;
}

.carousel-dots .dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--border);
    cursor: pointer;
    transition: var(--transition);
}

.carousel-dots .dot.active {
    background: var(--primary);
}

/* ==================== 客户案例 ==================== */
.clients {
    padding: 80px 0;
}

.client-marquee-wrap {
    width: 100%;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.template-row {
    display: none;
}

.marquee-row {
    width: 100%;
}

.marquee-track {
    width: 100%;
    height: 100px;
    overflow: hidden;
}

.marquee-track .logo-group {
    display: flex;
    will-change: transform;
    animation: scrollLeft 28s linear infinite;
}

.row-top .logo-group {
    animation-delay: 0s;
}

.row-mid .logo-group {
    animation-delay: -9.33s;
}

.row-bottom .logo-group {
    animation-delay: -18.66s;
}

.client-marquee-wrap:hover .logo-group {
    animation-play-state: paused;
}

.logo-block {
    display: flex;
}

.client-logo {
    height: 100px;
    flex: 0 0 260px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 8px;
    box-sizing: border-box;
}

.client-logo img {
    object-fit: contain;
}

.client-logo:hover {
    background: #efefef;
    transform: translateY(-2px);
    transition: 0.2s ease;
}

@keyframes scrollLeft {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-50%);
    }
}

/* ==================== 应用领域 ==================== */
.application {
    position: relative;
    padding: 80px 0;
    background: url("../img/app_bg.jpg") center/cover no-repeat;
    overflow: hidden;
}

.app-field-bg {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    height: 300px;
    background: radial-gradient(ellipse at center bottom, rgba(0, 120, 255, 0.15) 0%, rgba(0, 60, 180, 0.08) 40%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.application .section-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 40px;
}

.app-field-header-left {
    flex-shrink: 0;
}

.app-field-header-left .section-title {
    color: #ffffff;
}

.app-field-header-left .section-subtitle {
    color: #ffffff;
}

.app-field-tabs {
    display: flex;
    gap: 32px;
    align-items: center;
    border-bottom: 1px solid #3a3736;
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

.app-field-tabs::-webkit-scrollbar {
    display: none;
}

.app-tab {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.6);
    cursor: pointer;
    padding-bottom: 20px;
    position: relative;
    transition: color 0.3s ease;
    white-space: nowrap;
    user-select: none;
    flex-shrink: 0;
}

.app-tab:hover {
    color: rgba(255, 255, 255, 0.9);
}

.app-tab.active {
    color: #00b4ff;
}

.app-tab.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 2px;
    background: #00b4ff;
}

.app-carousel {
    position: relative;
    width: 100%;
    overflow: hidden;
    margin-bottom: 30px;
}

.app-carousel-track {
    display: flex;
    align-items: center;
    transition: transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    padding: 0 5%;
}

.app-slide {
    position: relative;
    flex-shrink: 0;
    width: 70%;
    height: 600px;
    overflow: hidden;
    opacity: 0.4;
    transition: opacity 0.6s ease, transform 0.6s ease;
    margin-right: 40px;
}

.app-slide.active {
    opacity: 1;
}

.app-slide-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.app-slide-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: flex-end;
    justify-content: flex-end;
    padding: 40px 80px 0 40px;
}

.app-info-card {
    background: rgba(0, 0, 0, 0.6);
    padding: 40px 36px;
    max-width: 420px;
    width: 100%;
}

.app-info-title {
    font-size: 24px;
    font-weight: 700;
    color: #ffffff;
    margin: 0 0 20px 0;
    padding-bottom: 20px;
    letter-spacing: 1px;
    text-align: center;
    border-bottom: 1px solid #3a3736;
}

.app-info-desc {
    font-size: 14px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.65);
    margin: 0 0 28px 0;
}

.app-info-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: #1a7fd4;
    color: #ffffff;
    font-size: 14px;
    padding: 12px 24px;
    border-radius: 3px;
    text-decoration: none;
    transition: background 0.3s ease;
    letter-spacing: 1px;
}

.app-info-btn:hover {
    background: #1568b0;
    color: #ffffff;
}

.app-info-btn i {
    font-size: 12px;
}

.app-carousel-controls {
    max-width: 1200px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
}

.app-progress-bar {
    width: 200px;
    height: 2px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 1px;
    overflow: hidden;
}

.app-progress-fill {
    height: 100%;
    background: #00b4ff;
    border-radius: 1px;
    transition: width 0.6s ease;
    width: 12.5%;
}

.app-nav-arrows {
    display: flex;
    gap: 16px;
}

.app-arrow-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.05);
    color: #ffffff;
    font-size: 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.app-arrow-btn:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.4);
}

.app-arrow-btn i {
    font-size: 14px;
}

/* ==================== 解决方案 ==================== */
.solutions {
    padding: 80px 0;
}

.solution-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.solution-card {
    background: var(--white);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.solution-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.solution-img {
    overflow: hidden;
}

.solution-img-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #1a3a5c, #0052cc);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    color: rgba(255, 255, 255, 0.5);
    transition: var(--transition);
}

.solution-card:hover .solution-img-placeholder {
    transform: scale(1.05);
}

.solution-info {
    padding: 20px;
}

.solution-info h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
    line-height: 1.5;
}

.solution-info p {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.7;
    margin-bottom: 16px;
}

/* ==================== 关于汇源 ==================== */
.about {
    padding: 80px 0;
    position: relative;
    overflow: hidden;
    background: url("../img/about_bg.jpg") center center no-repeat;
    background-size: cover;
}

.about-bg {
    /*position: absolute;*/
    /*top: 0;*/
    /*left: 0;*/
    /*width: 100%;*/
    /*height: 100%;*/
    /*background: url("../img/about_bg.jpg") center center no-repeat;*/
    /*background-size: cover;*/
    /*z-index: 0;*/
}

.about-content {
    position: relative;
    z-index: 1;
}

.about .section-header {
    margin-bottom: 80px;
}

.about .section-title::after {
    background: var(--accent);
}

.about-text {
    max-width: 500px;
    font-size: 16px;
    line-height: 1.8;
}

.about-text p {
    margin-bottom: 16px;
}

.about-stats {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    text-align: center;
    align-items: center;
}

.stat-item {
    text-align: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.15);
    min-width: 140px;
    align-items: center;
}

.stat-item:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-4px);
}

.stat-icon {
    font-size: 28px;
    color: var(--accent);
    margin-bottom: 12px;
}

.stat-number {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 4px;
}

.stat-label {
    font-size: 13px;
}

/* ==================== 新闻资讯 ==================== */
.news {
    padding: 80px 0;
    background: url("../img/news_bg.jpg") center/cover no-repeat;
    position: relative;
    overflow: hidden;
}

.news::before {
    content: '';
    position: absolute;
    top: -200px;
    right: -200px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 82, 204, 0.06) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.news-header-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 40px;
}

.news-header-left .section-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.news-header-left .section-subtitle {
    font-size: 18px;
    /*color: var(--text-gray);*/
}

.news-tabs {
    display: flex;
    gap: 12px;
    margin-bottom: 0;
}

.news-tab {
    padding: 10px 28px;
    font-size: 14px;
    color: var(--text-dark);
    cursor: pointer;
    background: var(--white);
    border-radius: 30px;
    transition: all 0.3s ease;
    font-weight: 500;
    border: 1px solid #e0e0e0;
    user-select: none;
}

.news-tab:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.news-tab.active {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

.news-content {
    display: flex;
    gap: 40px;
    align-items: flex-start;
}

.news-featured {
    width: 50%;
    flex-shrink: 0;
}

.news-featured-img {
    position: relative;
    height: 460px;
    border-radius: 4px;
    overflow: hidden;
}

.news-featured-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: opacity 0.4s ease;
}

.news-featured-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 30px 28px 24px;
    background: linear-gradient(transparent, rgba(0, 50, 120, 0.85));
}

.news-featured-overlay h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 8px;
    line-height: 1.4;
    transition: opacity 0.3s ease;
}

.news-featured-overlay .news-date {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
}

.news-list {
    width: 50%;
    display: flex;
    flex-direction: column;
}

.news-item {
    padding: 24px 0;
    border-bottom: 1px solid #e0e4ea;
    transition: all 0.3s ease;
    cursor: pointer;
    display: none;
}

.news-item.visible {
    display: block;
}

.news-item:first-child.visible {
    padding-top: 0;
}

.news-item.visible:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.news-item:hover .news-item-title {
    color: var(--primary);
}

.news-item.active {
    background: rgba(0, 82, 204, 0.03);
    border-radius: 6px;
    padding-left: 16px;
    padding-right: 16px;
    margin-left: -16px;
    margin-right: -16px;
}

.news-item-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.news-item-cat {
    font-size: 12px;
    color: var(--white);
    background: #5b8fc9;
    padding: 3px 10px;
    border-radius: 2px;
    display: inline-block;
    flex-shrink: 0;
    line-height: 1.6;
}


.news-item-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 0;
    line-height: 1.5;
    flex: 1;
    transition: color 0.3s ease;
}

.news-item.active .news-item-title {
    color: var(--primary);
}

.news-item-date {
    font-size: 13px;
    color: #999;
    flex-shrink: 0;
    white-space: nowrap;
}

.news-item-desc {
    font-size: 13px;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 16px;
    display: none;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, opacity 0.3s ease, margin 0.3s ease;
    opacity: 0;
}

.news-item.active .news-item-desc {
    display: block;
    max-height: 120px;
    opacity: 1;
    margin-top: 4px;
}

.news-item-action {
    display: flex;
    justify-content: flex-start;
    margin-top: 8px;
}

.news-item-link {
    width: 36px;
    height: 36px;
    background: transparent;
    color: var(--primary);
    border-radius: 50%;
    border: 1.5px solid var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    transition: all 0.3s ease;
}

.news-item-link:hover {
    background: var(--primary);
    color: var(--white);
    transform: scale(1.05);
}

/* ==================== Footer ==================== */
.footer {
    background: #f6f6f6;
    /*color: var(--white);*/
}

.footer-top {
    padding: 50px 0 30px;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.footer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 0;
}

.footer-logo img {
    height: 56px;
    width: auto;
}

.footer-hotline {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 0;
}

.hotline-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
}

.hotline-info {
    display: flex;
    flex-direction: column;
}

.hotline-label {
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 2px;
}

.hotline-label i {
    color: var(--primary);
    margin-right: 4px;
}

.hotline-number {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
}

.footer-content {
    display: flex;
    gap: 60px;
}

.footer-brand {
    /*width: 340px;*/
    flex-shrink: 0;
}

.footer-address {
    margin-bottom: 24px;
}

.footer-address p {
    font-size: 16px;
    color: var(--text-gray);
    margin-bottom: 12px;
    display: flex;
    align-items: flex-start;
    gap: 8px;
    line-height: 1.6;
}

.footer-address i {
    color: var(--text-gray);
    margin-right: 0;
    width: 16px;
    flex-shrink: 0;
    margin-top: 3px;
}

.footer-address .addr-label {
    color: var(--text-gray);
    min-width: 56px;
    flex-shrink: 0;
}

.footer-address .addr-value {
    color: var(--text-dark);
}

.footer-qrcodes {
    display: flex;
    gap: 24px;
    margin-top: 16px;
}

.qr-item {
    text-align: center;
}

.qr-placeholder {
    width: 128px;
    height: 128px;
    background: var(--white);
    border: 1px solid #e0e0e0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: #ccc;
    margin-bottom: 8px;
    border-radius: 4px;
}

.qr-item span {
    font-size: 14px;
    color: var(--text-gray);
}

.footer-nav {
    flex: 1;
    display: flex;
    gap: 36px;
    flex-wrap: nowrap;
    justify-content: flex-end;
}

.footer-nav-col {
    min-width: 80px;
}

.footer-nav-col h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 16px;
    position: relative;
    padding-bottom: 0;
}

.footer-nav-col ul li {
    margin-bottom: 10px;
}

.footer-nav-col ul li a {
    font-size: 14px;
    color: var(--text-gray);
    transition: var(--transition);
    position: relative;
    display: inline-block;
}

.footer-nav-col ul li a:hover {
    color: var(--primary);
    padding-left: 0;
}

.footer-bottom {
    border-top: 1px solid #ddd;
    padding: 20px 0;
}

.footer-bottom-inner {
    text-align: center;
    font-size: 16px;
    /*color: var(--text-gray);*/
}

/* ==================== 右侧浮动工具栏 ==================== */
.float-toolbar {
    position: fixed;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 999;
    display: flex;
    flex-direction: column;
    /*background: var(--white);*/
    /*border-radius: 8px;*/
    /*gap: 2px;*/
}

.float-btn {
    width: 80px;
    height: 80px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    background: var(--white);
    color: var(--text-dark);
    /*border: 1px solid #e8e8e8;*/
}

.float-btn i {
    font-size: 20px;
    margin-bottom: 4px;
}

.float-btn span {
    font-size: 14px;
    line-height: 2;
}

.float-btn:hover {
    background: var(--primary);
    color: var(--white);
}

/* 电话按钮 - 蓝色 */
.float-btn-phone {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

.float-btn-phone:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
}

/* 统一弹出层样式 */
.float-popup {
    position: absolute;
    right: 90px;
    top: 50%;
    transform: translateY(-50%);
    background: var(--white);
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    padding: 16px 20px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    pointer-events: none;
    white-space: nowrap;
}

.float-btn:hover .float-popup {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

/* 电话弹出层 */
.float-popup-phone {
    display: flex;
    align-items: center;
    gap: 8px;
}

.float-popup-phone span {
    font-size: 14px;
    color: var(--text-dark);
}

.float-popup-phone strong {
    font-size: 18px;
    /*color: var(--primary);*/
    font-weight: 700;
}

/* 二维码弹出层 */
.float-popup-qrcode {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 16px;
    width: 128px;
    height: 150px;
}

.float-popup-qrcode img {
    width: 120px;
    height: 120px;
    object-fit: contain;
}

.float-popup-qrcode span {
    font-size: 12px;
    color: var(--text-gray);
}

/* 返回顶部按钮 */
.float-btn-top {
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
}

.float-btn-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* 手机端隐藏浮动工具栏 */
@media (max-width: 768px) {
    .float-toolbar {
        display: none;
    }
}


/* ================================================================
   响应式断点
   ================================================================ */

/* ==================== 宽屏桌面 ≥1920px ==================== */
@media (min-width: 1920px) {
    html {
        font-size: 18px;
    }

    .container {
        max-width: 1600px;
    }

    .nav-inner {
        height: 90px;
    }

    .nav-item > a {
        height: 90px;
        line-height: 90px;
        padding: 0 24px;
        font-size: 18px;
    }

    .logo img {
        height: 80px;
    }

    .banner {
        min-height: 700px;
    }

    .banner-title {
        font-size: 68px;
    }

    .banner-subtitle {
        font-size: 24px;
    }

    .section-title {
        font-size: 44px;
    }

    .section-subtitle{
        font-size:18px;
    }

    .product-grid {
        min-height: 680px;
    }

    .product-card {
        min-height: 680px;
        padding: 60px 50px;
    }

    .card-title {
        font-size: 30px;
    }

    .cert-item {
        width: 250px;
        min-width: 250px;
        height: 308px;
        min-height: 308px;
    }

    .app-slide {
        height: 700px;
    }

    .solution-grid {
        gap: 32px;
    }

    .news-featured-img {
        height: 520px;
    }

    .footer-top {
        padding: 60px 0 40px;
    }

    .footer-content {
        gap: 80px;
    }
}

/* ==================== 超大屏 1400-1920px ==================== */
@media (min-width: 1400px) and (max-width: 1919px) {
    .container {
        max-width: 1300px;
    }

    .cert-item {
        width: 260px;
        min-width: 260px;
    }
}

/* ==================== 笔记本 1200-1400px ==================== */
@media (min-width: 1200px) and (max-width: 1399px) {
    .container {
        max-width: 1140px;
    }

    .nav-item > a {
        padding: 0 14px;
        font-size: 14px;
    }

    .banner-title {
        font-size: 48px;
    }

    .product-card {
        padding: 40px 30px;
    }

    .card-title {
        font-size: 22px;
    }

    .bottom-img {
        width: 50%;
        max-width: 250px;
    }

    .cert-item {
        width: 220px;
        min-width: 220px;
        height: 280px;
        min-height: 280px;
    }

    .app-slide {
        width: 75%;
        height: 500px;
    }

    .footer-content {
        gap: 40px;
    }

    .footer-brand {
        width: 300px;
    }

    .footer-nav {
        gap: 24px;
    }
}

/* ==================== Tablet ≤1200px ==================== */
@media (max-width: 1200px) {
    .product-grid {
        flex-wrap: wrap;
        min-height: auto;
    }

    .product-card {
        min-height: 500px;
        flex: 1 1 50%;
        padding: 40px 30px;
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .product-card.active,
    .product-card:hover {
        flex: 1 1 50%;
    }

    .client-logo {
        flex: 0 0 240px;
        height: 95px;
    }

    .card-title {
        font-size: 22px;
    }

    .bottom-img {
        width: 50%;
        max-width: 250px;
    }

    .app-field-tabs {
        gap: 20px;
        /*flex-wrap: wrap;*/
    }

    .app-slide {
        width: 80%;
        height: 420px;
    }
}

/* ==================== Tablet ≤1024px ==================== */
@media (max-width: 1024px) {
    .product-grid {
        display: flex;
        flex-wrap: wrap;
    }

    .product-card {
        min-height: 400px;
    }

    .product-card.active,
    .product-card:hover {
        flex: 1;
        width: 100%;
        max-width: 100%;
    }

    .product-header-row {
        flex-direction: column;
    }

    .product-header-right {
        width: 100%;
    }

    .product-tabs {
        justify-content: flex-start;
        overflow-x: auto;
        padding-bottom: 8px;
    }

    .client-logo {
        flex: 0 0 200px;
        height: 90px;
    }

    .marquee-track {
        height: 90px;
    }

    .marquee-track .logo-group {
        animation-duration: 22s;
    }

    .row-mid .logo-group {
        animation-delay: -7.33s;
    }

    .row-bottom .logo-group {
        animation-delay: -14.66s;
    }

    .sub-categories {
        justify-content: flex-start;
        overflow-x: auto;
        padding-bottom: 8px;
    }

    .product-header-left .section-title {
        font-size: 36px;
    }

    .solution-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .app-content {
        gap: 30px;
    }

    .footer-top {
        flex-direction: column;
    }

    .footer-brand,
    .footer-nav {
        width: 100%;
    }

    .cert-item {
        width: 200px;
        min-width: 200px;
    }

    .footer-content {
        flex-direction: column;
        gap: 30px;
    }

    .footer-brand {
        width: 100%;
    }

    .footer-nav {
        flex-wrap: wrap;
        gap: 24px;
        justify-content: flex-start;
    }
}

/* ==================== Tablet ≤992px ==================== */
@media (max-width: 992px) {
    .app-field-header,
    .application .section-header {
        flex-direction: column;
        gap: 24px;
    }

    .app-slide {
        width: 90%;
        height: 380px;
    }

    .app-info-card {
        max-width: 340px;
        padding: 28px 24px;
    }

    .news-header-row {
        flex-direction: column;
        gap: 20px;
    }

    .about-stats {
        flex-wrap: wrap;
        gap: 20px;
        /*justify-content: center;*/
    }
}

/* ==================== Mobile ≤768px ==================== */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }

    /* Header */
    .nav-inner {
        height: 60px;
    }

    .logo img {
        /*height: 36px;*/
    }

    .logo-icon {
        width: 36px;
        height: 36px;
        font-size: 12px;
    }

    .logo-cn {
        font-size: 14px;
    }

    .logo-en {
        font-size: 8px;
    }

    .nav-item > a {
        height: 60px;
        line-height: 60px;
        padding: 0 12px;
        font-size: 13px;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -280px;
        width: 280px;
        height: 100vh;
        background: rgba(10, 22, 40, 0.95);
        backdrop-filter: blur(10px);
        flex-direction: column;
        padding: 60px 20px 20px;
        box-shadow: -4px 0 20px rgba(0, 0, 0, 0.3);
        transition: 0.3s ease;
        z-index: 999;
        overflow-y: auto;
    }

    .nav-menu.show {
        right: 0;
    }

    .nav-item > a {
        padding: 12px 16px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        color: var(--white);
        height: auto;
        line-height: 1.6;
    }

    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        background: var(--bg-gray);
        border-radius: 0;
        display: none;
    }

    .has-dropdown:hover .dropdown-menu,
    .has-dropdown .dropdown-menu.show {
        display: block;
    }

    .mobile-toggle {
        display: flex;
    }

    .nav-search {
        display: none;
    }

    /* Banner */
    .banner {
        height: 80vh;
        min-height: 500px;
    }

    .banner-title {
        font-size: 32px;
    }

    .banner-subtitle {
        font-size: 16px;
    }

    .banner-btn-circle .btn-arrow {
        width: 38px;
        height: 38px;
    }

    .banner-btn-circle .btn-text {
        font-size: 14px;
    }

    .banner-controls-left {
        left: 20px;
        bottom: 24px;
        gap: 10px;
    }

    .scroll-down {
        right: 20px;
        bottom: 24px;
    }

    /* Products */
    .products {
        padding: 60px 0 0;
    }

    .product-header-row {
        flex-direction: column;
        gap: 20px;
        margin-bottom: 24px;
    }

    .product-grid {
        flex-direction: column;
        background: none;
        background-size: auto;
    }

    .product-card {
        min-height: 450px;
        flex: 1;
        padding: 30px 20px;
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        background: url("../img/product_bg.png") center center no-repeat;
        background-size: cover;
    }

    .product-card:last-child {
        border-bottom: none;
    }

    .product-card.active,
    .product-card:hover {
        flex: 1;
    }

    .card-title {
        font-size: 22px;
    }

    .card-sub {
        font-size: 13px;
    }

    .spec-row {
        margin-bottom: 100px;
    }

    .bottom-img {
        bottom: auto;
        right: 10px;
        max-width: none;
        margin: 20px 0;
        opacity: 1 !important;
        transform: none !important;
    }

    .card-hover-icon {
        display: none;
    }

    .tab-item {
        padding: 10px 16px;
        font-size: 13px;
    }


    /* Certificates */
    .cert-item {
        /*width: 140px;*/
        /*min-width: 140px;*/
    }

    .advantages {
        padding: 60px 0 0;
        background: url("../img/advantages_bg.jpg") center center no-repeat;
        background-size: cover;
    }

    /* Clients */
    .clients {
        padding: 40px 0;
    }

    .client-logo {
        flex: 0 0 200px;
        height: 80px;
    }

    .marquee-track {
        height: 80px;
    }

    .marquee-track .logo-group {
        animation-duration: 18s;
    }

    .row-mid .logo-group {
        animation-delay: -6s;
    }

    .row-bottom .logo-group {
        animation-delay: -12s;
    }

    /* Application */
    .application {
        padding: 60px 0;
    }

    .application .section-header {
        display: block;
    }

    .app-field-tabs {
        margin-top: 20px;
    }

    .app-slide {
        width: 95%;
        height: 320px;
    }

    .app-slide-overlay {
        padding: 20px;
    }

    .app-info-card {
        max-width: 100%;
    }

    .app-info-title {
        font-size: 20px;
    }

    .app-carousel-controls {
        gap: 24px;
    }

    /* Solutions */
    .solutions {
        padding: 60px 0;
    }

    .solution-grid {
        grid-template-columns: 1fr;
    }

    /* About */
    .about {
        padding: 60px 0;
    }

    .about .section-header {
        margin-bottom: 40px;
    }

    .about-stats {
        gap: 16px;
    }

    .stat-item {
        min-width: 90px;
        padding: 16px;
    }

    .stat-number {
        font-size: 16px;
    }

    /* News */
    .news {
        padding: 60px 0;
    }

    .news-content {
        flex-direction: column;
    }

    .news-featured,
    .news-list {
        width: 100%;
    }

    .news-featured-img {
        height: 240px;
    }

    .news-tabs {
        flex-wrap: wrap;
    }

    .news-tab {
        padding: 8px 20px;
        font-size: 13px;
    }

    /* Footer */
    .footer-top {
        padding: 40px 0 20px;
    }

    .footer-header {
        margin-top: 40px;
        flex-direction: column;
        gap: 20px;
        /*text-align: center;*/
    }

    .footer-content {
        flex-direction: column;
        gap: 30px;
    }

    .footer-brand {
        width: 100%;
    }

    .footer-qrcodes {
        flex-wrap: wrap;
        justify-content: center;
    }

    .footer-nav {
        display: none;
        gap: 16px;
        flex-wrap: wrap;
        justify-content: flex-start;
    }

    .footer-nav-col {
        min-width: 80px;
    }

    /* Section headers */
    .section-title {
        font-size: 26px;
    }

    .section-subtitle {
        font-size: 14px;
    }

    .scroll-down {
        display: none;
    }
}

/* ==================== Small Mobile ≤480px ==================== */
@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .banner {
        height: 70vh;
        min-height: 400px;
    }

    .banner-title {
        font-size: 26px;
        margin-bottom: 20px;
    }

    .banner-subtitle {
        font-size: 14px;
        letter-spacing: 1px;
    }

    .banner-controls-left {
        left: 16px;
        bottom: 20px;
        gap: 8px;
    }

    .products {
        padding: 40px 0 0;
    }

    .product-header-left .section-title {
        font-size: 28px;
    }

    .product-tabs {
        overflow-x: auto;
        flex-wrap: nowrap;
        justify-content: flex-start;
        padding-bottom: 8px;
        -webkit-overflow-scrolling: touch;
    }

    .tab-item {
        white-space: nowrap;
        flex-shrink: 0;
    }

    .sub-categories {
        overflow-x: auto;
        flex-wrap: nowrap;
        justify-content: flex-start;
        padding-bottom: 8px;
    }

    .sub-cat {
        white-space: nowrap;
        flex-shrink: 0;
    }

    .product-card {
        min-height: 380px;
        padding: 24px 16px;
    }

    .card-title {
        font-size: 20px;
    }

    .spec-row {
        margin-bottom: 80px;
    }

    .advantages {
        padding: 40px 0 0;
    }

    .cert-track {
        flex-wrap: nowrap;
        justify-content: flex-start;
        padding-bottom: 12px;
    }

    .cert-item {
        width: 180px;
        min-width: 180px;
        flex-shrink: 0;
        height: auto;
        min-height: auto;
    }


    .app-tabs {
        overflow-x: auto;
        flex-wrap: nowrap;
        justify-content: flex-start;
        padding-bottom: 8px;
    }

    .app-tab {
        white-space: nowrap;
        flex-shrink: 0;
    }

    .app-slide {
        height: 260px;
    }

    .app-info-card {
        padding: 20px 16px;
    }

    .app-info-title {
        font-size: 18px;
    }

    .app-info-desc {
        font-size: 13px;
    }

    .app-carousel-controls {
        gap: 16px;
    }

    .app-progress-bar {
        width: 120px;
    }

    .app-arrow-btn {
        width: 36px;
        height: 36px;
        font-size: 14px;
    }

    .logo-row {
        flex-wrap: wrap;
    }

    .client-logo {
        flex: 0 0 45vw;
        height: 70px;
        min-width: 70px;
    }

    .marquee-track {
        height: 70px;
    }

    .marquee-track > .logo-group,
    .marquee-track::before,
    .marquee-track::after {
        animation-duration: 15s;
    }

    .about-stats {
        /*flex-direction: column;*/
        align-items: center;
        flex-wrap: nowrap;
    }

    .stat-item {
        width: 100%;
        max-width: 300px;
    }

    /*.footer-nav-col {*/
    /*    min-width: 50%;*/
    /*}*/
    .footer-nav {
        /*display: grid;*/
        grid-template-columns: repeat(2, 1fr);
        display: none;
    }

    .hotline-number {
        font-size: 22px;
    }

    .qr-placeholder {
        /*width: 100px;*/
        /*height: 100px;*/
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 38px;
        height: 38px;
        font-size: 14px;
    }

    .section-title {
        font-size: 24px;
    }

    .news-featured-img {
        height: 200px;
    }

    .news-item-title {
        font-size: 14px;
    }

    .news-tab {
        padding: 6px 16px;
        font-size: 12px;
    }
}

/* ==================== 额外特效 ==================== */

/* 产品卡片入场动画 */
.product-card {
    animation: slideIn 0.5s ease both;
}

.product-card:nth-child(1) {
    animation-delay: 0.1s;
}

.product-card:nth-child(2) {
    animation-delay: 0.2s;
}

.product-card:nth-child(3) {
    animation-delay: 0.3s;
}

.product-card:nth-child(4) {
    animation-delay: 0.4s;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 统计数字动画 */
.stat-number {
    animation: countUp 1s ease both;
}

@keyframes countUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 客户logo滚动 */
.logo-row {
    animation: scrollLogos 20s linear infinite;
}

/* 按钮光波效果 */
.btn-detail {
    position: relative;
    overflow: hidden;
}

.btn-detail::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.4s ease, height 0.4s ease;
}

.btn-detail:hover::after {
    width: 200%;
    height: 200%;
}

/* Banner标题光晕 */
.banner-slide.active .banner-title {
    animation: textGlow 3s ease-in-out infinite alternate;
}

@keyframes textGlow {
    0% {
        text-shadow: 0 0 10px rgba(255, 107, 0, 0.3);
    }
    100% {
        text-shadow: 0 0 20px rgba(255, 107, 0, 0.5);
    }
}

/* 页面加载淡入 */
body {
    animation: pageLoad 0.8s ease both;
}

@keyframes pageLoad {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* 证书轮播优化 */
.cert-carousel .cert-wrapper {
    overflow: hidden;
    width: 100%;
}


/* Banner */
.product-banner {
    position: relative;
    width: 100%;
    height: 600px;
    overflow: hidden;
}

.product-banner-bg {
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

/* 面包屑 + 分类Tab */
.product-breadcrumb-bar {
    background: var(--white);
    border-bottom: 1px solid #eee;
    padding: 16px 0;
}

.breadcrumb-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.breadcrumb-path {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-gray);
}

.breadcrumb-path a {
    color: var(--text-gray);
    transition: color 0.3s ease;
}

.breadcrumb-path a:hover {
    color: var(--primary);
}

.breadcrumb-sep {
    font-size: 10px;
    color: #ccc;
}

.breadcrumb-current {
    color: var(--primary);
    font-weight: 500;
}

.category-tabs {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}

.cat-tab {
    padding: 6px 16px;
    font-size: 14px;
    color: var(--text-dark);
    text-decoration: none;
    transition: all 0.3s ease;
    position: relative;
    border-bottom: 2px solid transparent;
}

.cat-tab:hover {
    color: var(--primary);
}

.cat-tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
    font-weight: 600;
}

/* 主体布局 */
.product-list-section {
    padding: 40px 0 60px;
    background: #f5f7fa;
}

.product-layout {
    display: flex;
    gap: 24px;
    align-items: flex-start;
}

/* 左侧侧边栏 */
.product-sidebar {
    width: 220px;
    flex-shrink: 0;
    background: var(--white);
    border: 1px solid #e8e8e8;
}

.sidebar-title {
    background: var(--primary);
    color: var(--white);
    font-size: 16px;
    font-weight: 700;
    padding: 14px 16px;
    letter-spacing: 1px;
}

.sidebar-menu {
    padding: 0;
}

.sidebar-group {
    border-bottom: 1px solid #f0f0f0;
}

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

.sidebar-group-header {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    cursor: pointer;
    transition: background 0.3s ease;
    gap: 8px;
}

.sidebar-group-header:hover {
    background: #f5f8ff;
}

.sidebar-toggle-icon {
    width: 20px;
    height: 20px;
    background: var(--primary);
    color: var(--white);
    font-size: 14px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    line-height: 1;
}

.sidebar-group-name {
    font-size: 14px;
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.sidebar-group-name:hover,
.sidebar-group-name.active {
    color: var(--primary);
}

.sidebar-submenu {
    display: none;
    padding: 0 0 8px 0;
    margin: 0;
    list-style: none;
}

.sidebar-submenu.show {
    display: block;
}

.sidebar-submenu li {
    padding: 0;
}

.sidebar-submenu li a {
    display: block;
    padding: 8px 16px 8px 44px;
    font-size: 13px;
    color: var(--text-gray);
    text-decoration: none;
    transition: all 0.3s ease;
    position: relative;
}

.sidebar-submenu li a::before {
    content: '·';
    position: absolute;
    left: 32px;
    color: var(--primary);
    font-weight: 700;
}

.sidebar-submenu li a:hover,
.sidebar-submenu li a.active {
    color: var(--primary);
    background: #f5f8ff;
}

/* 右侧产品列表 */
.product-main {
    flex: 1;
    min-width: 0;
}

.product-grid-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.product-card-list {
    background: var(--white);
    border: 1px solid #e8e8e8;
    overflow: hidden;
    transition: all 0.3s ease;
}

.product-card-list:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.product-card-img {
    display: block;
    width: 100%;
    height: 220px;
    overflow: hidden;
    background: #f8f9fa;
}

.product-card-img img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 20px;
    transition: transform 0.4s ease;
}

.product-card-list:hover .product-card-img img {
    transform: scale(1.05);
}

.product-card-info {
    padding: 16px;
    text-align: center;
}

.product-card-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.product-card-title a {
    color: inherit;
    text-decoration: none;
    transition: color 0.3s ease;
}

.product-card-title a:hover {
    color: var(--primary);
}

.product-card-desc {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 8px 12px;
    background: #f5f7fa;
    border-radius: 4px;
}

.product-card-desc span {
    font-size: 12px;
    color: var(--text-light);
    flex: 1;
}

.product-card-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    color: var(--primary);
    text-decoration: none;
    white-space: nowrap;
    padding: 4px 10px;
    border: 1px solid var(--primary);
    border-radius: 3px;
    transition: all 0.3s ease;
}

.product-card-btn:hover {
    background: var(--primary);
    color: var(--white);
}

.product-card-btn i {
    font-size: 11px;
}

/* 分页 */
.product-pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin-top: 40px;
    padding: 20px 0;
}

.product-pagination .pagination {
    display: flex;
    gap: 8px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.product-pagination .pagination li a,
.product-pagination .pagination li span {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    font-size: 14px;
    color: var(--text-dark);
    text-decoration: none;
    border: 1px solid #ddd;
    transition: all 0.3s ease;
}

.product-pagination .pagination li.active a,
.product-pagination .pagination li.active span {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

.product-pagination .pagination li a:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* ==================== 产品列表页响应式 ==================== */

/* 笔记本 */
@media (min-width: 1200px) and (max-width: 1399px) {
    .product-grid-list {
        grid-template-columns: repeat(3, 1fr);
        gap: 16px;
    }
}

/* 平板 ≤1200px */
@media (max-width: 1200px) {
    .product-grid-list {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 平板 ≤1024px */
@media (max-width: 1024px) {
    .product-sidebar {
        width: 180px;
    }

    .product-grid-list {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .breadcrumb-row {
        flex-direction: column;
        align-items: flex-start;
    }

    .category-tabs {
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 4px;
        width: 100%;
    }

    .cat-tab {
        white-space: nowrap;
        flex-shrink: 0;
    }
}

/* 手机 ≤768px */
@media (max-width: 768px) {
    .product-banner {
        height: 180px;
    }

    .product-layout {
        flex-direction: column;
    }

    .product-sidebar {
        width: 100%;
    }

    .product-grid-list {
        grid-template-columns: 1fr;
    }

    .product-card-img {
        height: 200px;
    }

    .breadcrumb-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .category-tabs {
        overflow-x: auto;
        flex-wrap: nowrap;
        -webkit-overflow-scrolling: touch;
    }

    .cat-tab {
        white-space: nowrap;
        flex-shrink: 0;
    }

    .product-list-section {
        padding: 20px 0 40px;
    }
}

/* 小屏手机 ≤480px */
@media (max-width: 480px) {
    .product-banner {
        height: 140px;
    }

    .product-card-img {
        height: 180px;
    }

    .product-card-desc {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
}