/* ==================== 全局样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1e5a9e;
    --secondary-color: #2c7be5;
    --accent-color: #e63946;
    --text-dark: #333333;
    --text-light: #666666;
    --bg-light: #f7f9fc;
    --white: #ffffff;
    --shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.10);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.12);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --radius: 10px;
    --radius-lg: 16px;
}

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: 1560px;
    margin: 0 auto;
    padding: 0 20px;
}

.section-padding {
    padding: 48px 0;
}

.bg-light {
    background-color: var(--bg-light);
    position: relative;
}

.bg-light::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 80%, rgba(30, 90, 158, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(44, 123, 229, 0.03) 0%, transparent 50%);
    pointer-events: none;
}

/* ==================== 预加载动画 ==================== */
#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #ffffff;
    z-index: 99999;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

#preloader.fade-out {
    opacity: 0;
    visibility: hidden;
}

.loader-wrapper {
    position: relative;
    width: 120px;
    height: 120px;
}

.loader-ring {
    position: absolute;
    border-radius: 50%;
    border: 3px solid transparent;
    animation: loaderSpin 1.5s cubic-bezier(0.68, -0.55, 0.27, 1.55) infinite;
}

.loader-ring:nth-child(1) {
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-top-color: var(--primary-color);
    animation-delay: 0s;
}

.loader-ring:nth-child(2) {
    top: 10px;
    left: 10px;
    right: 10px;
    bottom: 10px;
    border-right-color: var(--secondary-color);
    animation-delay: 0.15s;
}

.loader-ring:nth-child(3) {
    top: 20px;
    left: 20px;
    right: 20px;
    bottom: 20px;
    border-bottom-color: #4facfe;
    animation-delay: 0.3s;
}

.loader-ring:nth-child(4) {
    top: 30px;
    left: 30px;
    right: 30px;
    bottom: 30px;
    border-left-color: #43e97b;
    animation-delay: 0.45s;
}

.loader-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 28px;
    color: var(--primary-color);
    animation: loaderPulse 1.5s ease-in-out infinite;
}

@keyframes loaderSpin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes loaderPulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
    50% { transform: translate(-50%, -50%) scale(1.15); opacity: 0.7; }
}

.loader-text {
    margin-top: 20px;
    font-size: 15px;
    color: var(--primary-color);
    font-weight: 500;
    letter-spacing: 2px;
    animation: loaderFade 1.5s ease-in-out infinite;
}

@keyframes loaderFade {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 1; }
}

/* 加载进度条 */
.loader-progress {
    width: 200px;
    height: 3px;
    background: #e8ecf1;
    border-radius: 10px;
    margin-top: 16px;
    overflow: hidden;
}

.loader-progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), #4facfe);
    border-radius: 10px;
    transition: width 0.3s ease;
    animation: progressGrow 2s ease-in-out forwards;
}

@keyframes progressGrow {
    0% { width: 0%; }
    50% { width: 60%; }
    100% { width: 100%; }
}

/* ==================== 导航栏 ==================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.05);
    z-index: 1000;
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
    background: rgba(255, 255, 255, 0.97);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 700;
    color: var(--primary-color);
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.logo-img {
    height: 78px;
    width: auto;
    border-radius: 8px;
    transition: var(--transition);
}

.logo:hover {
    color: var(--secondary-color);
}

.logo:hover .logo-img {
    transform: scale(1.05);
}

.nav ul {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: var(--transition);
    padding: 8px 16px;
    border-radius: 6px;
    position: relative;
    font-size: 14px;
}

.nav a:hover {
    color: var(--primary-color);
    background: rgba(30, 90, 158, 0.05);
}

.nav a.active {
    color: var(--primary-color);
    background: rgba(30, 90, 158, 0.08);
    font-weight: 600;
}

.menu-toggle {
    display: none;
    font-size: 22px;
    cursor: pointer;
    color: var(--text-dark);
    width: 40px;
    height: 40px;
    border-radius: 8px;
    display: none;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.menu-toggle:hover {
    background: rgba(30, 90, 158, 0.08);
    color: var(--primary-color);
}

/* ==================== Banner轮播 ==================== */
.banner {
    position: relative;
    height: 420px;
    margin-top: 64px;
    overflow: hidden;
}

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

.banner-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    opacity: 0;
    transition: opacity 0.8s ease;
    overflow: hidden;
}

/* 网格点阵背景 */
.banner-slide::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle, rgba(255,255,255,0.08) 1px, transparent 1px);
    background-size: 40px 40px;
    z-index: 0;
}

/* 大圆装饰1 */
.banner-deco-1 {
    position: absolute;
    width: 320px;
    height: 320px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.1);
    top: -60px;
    right: 8%;
    animation: bannerFloat 7s ease-in-out infinite;
}

/* 大圆装饰2 */
.banner-deco-2 {
    position: absolute;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    bottom: -40px;
    right: 30%;
    animation: bannerFloat 9s ease-in-out infinite reverse;
}

/* 小方块装饰 */
.banner-deco-3 {
    position: absolute;
    width: 30px;
    height: 30px;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.08);
    top: 25%;
    right: 20%;
    animation: bannerSpin 12s linear infinite;
}

.banner-deco-4 {
    position: absolute;
    width: 18px;
    height: 18px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.1);
    top: 55%;
    right: 45%;
    animation: bannerSpin 8s linear infinite reverse;
}

/* 短线装饰 */
.banner-deco-5 {
    position: absolute;
    width: 60px;
    height: 3px;
    border-radius: 2px;
    background: rgba(255, 255, 255, 0.15);
    top: 18%;
    right: 35%;
    animation: bannerFloat 6s ease-in-out infinite;
}

.banner-deco-6 {
    position: absolute;
    width: 40px;
    height: 3px;
    border-radius: 2px;
    background: rgba(255, 255, 255, 0.12);
    bottom: 30%;
    right: 18%;
    animation: bannerFloat 8s ease-in-out infinite reverse;
}

@keyframes bannerFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -20px) scale(1.05); }
    66% { transform: translate(-20px, 15px) scale(0.95); }
}

@keyframes bannerSpin {
    from { transform: rotate(0deg) translateX(20px); }
    to { transform: rotate(360deg) translateX(20px); }
}

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

/* 两栏布局：左文右图 */
.banner-slide .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
    width: 100%;
    position: relative;
    z-index: 2;
}

.banner-content {
    color: var(--white);
    position: relative;
    z-index: 2;
    animation: slideUpIn 0.8s ease forwards;
}

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

.banner-content h1 {
    font-size: 34px;
    margin-bottom: 10px;
    font-weight: 700;
    line-height: 1.25;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.15);
}

.banner-content .banner-subtitle {
    font-size: 17px;
    margin-bottom: 18px;
    opacity: 0.88;
    line-height: 1.5;
    max-width: 480px;
    font-weight: 400;
}

/* Banner 数据指标行 */
.banner-stats {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.banner-stat {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(4px);
    padding: 8px 16px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.banner-stat-val {
    font-size: 22px;
    font-weight: 700;
    color: #fff;
    line-height: 1;
}

.banner-stat-label {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.3;
}

/* Banner 技术标签 */
.banner-tags {
    display: flex;
    gap: 10px;
    margin-bottom: 22px;
    flex-wrap: wrap;
}

.banner-tag {
    font-size: 12px;
    padding: 4px 12px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.9);
    letter-spacing: 0.5px;
}

/* 右侧数据可视化 */
.banner-visual-data {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
}

.banner-data-ring {
    position: relative;
    width: 90px;
    height: 90px;
    border-radius: 50%;
    border: 3px solid rgba(255, 255, 255, 0.15);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    animation: bannerPulse 3s ease-in-out infinite;
}

.banner-data-ring:nth-child(2) {
    animation-delay: 0.6s;
    width: 110px;
    height: 110px;
    border-color: rgba(255, 255, 255, 0.22);
}

.banner-data-ring:nth-child(3) {
    animation-delay: 1.2s;
    border-color: rgba(255, 255, 255, 0.18);
}

.banner-data-num {
    font-size: 22px;
    font-weight: 700;
    color: #fff;
    line-height: 1;
}

.banner-data-text {
    font-size: 10px;
    color: rgba(255, 255, 255, 0.75);
    text-align: center;
    margin-top: 2px;
}

/* 旧版视觉插图保留兼容（其他页可能引用） */
.banner-visual {
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    height: 100%;
    animation: slideUpIn 0.8s ease forwards;
    animation-delay: 0.15s;
    opacity: 0;
    animation-fill-mode: forwards;
}

.banner-visual-inner {
    position: relative;
    width: 220px;
    height: 220px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 插图：同心圆环 */
.banner-visual-ring {
    position: absolute;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.15);
    animation: bannerPulse 3s ease-in-out infinite;
}

.banner-visual-ring:nth-child(1) {
    width: 220px;
    height: 220px;
    animation-delay: 0s;
}

.banner-visual-ring:nth-child(2) {
    width: 170px;
    height: 170px;
    animation-delay: 0.5s;
    border-color: rgba(255, 255, 255, 0.2);
}

.banner-visual-ring:nth-child(3) {
    width: 120px;
    height: 120px;
    animation-delay: 1s;
    border-color: rgba(255, 255, 255, 0.25);
}

@keyframes bannerPulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.06); opacity: 0.7; }
}

/* 插图：中心图标 */
.banner-visual-icon {
    position: relative;
    z-index: 2;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
}

.banner-visual-icon i {
    font-size: 38px;
    color: rgba(255, 255, 255, 0.95);
    filter: drop-shadow(0 4px 8px rgba(0,0,0,0.15));
}

/* 插图：浮动小点 */
.banner-visual-dot {
    position: absolute;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.6);
}

.banner-visual-dot:nth-child(5) {
    top: 15px;
    right: 30px;
    animation: dotFloat 4s ease-in-out infinite;
}
.banner-visual-dot:nth-child(6) {
    bottom: 25px;
    left: 20px;
    animation: dotFloat 5s ease-in-out infinite 1s;
}
.banner-visual-dot:nth-child(7) {
    top: 50%;
    right: 5px;
    animation: dotFloat 3.5s ease-in-out infinite 0.5s;
}

@keyframes dotFloat {
    0%, 100% { transform: translate(0, 0); opacity: 0.6; }
    50% { transform: translate(5px, -10px); opacity: 1; }
}

/* 指示点 */
.banner-dots {
    position: absolute;
    bottom: 28px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 5;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

.dot.active {
    background: var(--white);
    transform: scale(1.4);
    border-color: rgba(255, 255, 255, 0.5);
}

.dot:hover {
    background: rgba(255, 255, 255, 0.8);
}

/* ==================== 按钮样式 ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-size: 15px;
    letter-spacing: 0.3px;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--white);
    box-shadow: 0 4px 16px rgba(30, 90, 158, 0.25);
}

.btn-primary:hover {
    background: var(--secondary-color);
    box-shadow: 0 6px 24px rgba(30, 90, 158, 0.35);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(30, 90, 158, 0.2);
}

/* ==================== 区块标题 ==================== */
.section-title {
    text-align: center;
    margin-bottom: 32px;
    position: relative;
}

.section-title h2 {
    font-size: 28px;
    margin-bottom: 10px;
    color: var(--text-dark);
    font-weight: 700;
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 3px;
}

.section-title p {
    font-size: 16px;
    color: var(--text-light);
    margin-top: 14px;
}

/* ==================== 核心优势 ==================== */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 18px;
}

.advantage-card {
    background: var(--white);
    padding: 26px 20px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid rgba(0, 0, 0, 0.04);
    position: relative;
    overflow: hidden;
}

.advantage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.advantage-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-6px);
}

.advantage-card:hover::before {
    transform: scaleX(1);
}

.advantage-card .icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 14px;
    background: linear-gradient(135deg, rgba(30, 90, 158, 0.1), rgba(44, 123, 229, 0.1));
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    position: relative;
}

.advantage-card:hover .icon {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    transform: scale(1.05) rotate(-3deg);
}

.advantage-card .icon i {
    font-size: 26px;
    color: var(--primary-color);
    transition: var(--transition);
}

.advantage-card:hover .icon i {
    color: var(--white);
}

.advantage-card h3 {
    font-size: 17px;
    margin-bottom: 8px;
    color: var(--text-dark);
    font-weight: 600;
}

.advantage-card p {
    color: var(--text-light);
    line-height: 1.7;
    font-size: 14px;
}

/* ==================== 产品展示 ==================== */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 20px;
}

.product-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid rgba(0, 0, 0, 0.04);
}

.product-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-6px);
}

.product-image {
    height: 160px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.product-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 30% 70%, rgba(255,255,255,0.15) 0%, transparent 50%),
        radial-gradient(circle at 70% 30%, rgba(255,255,255,0.1) 0%, transparent 50%),
        repeating-linear-gradient(45deg, transparent, transparent 10px, rgba(255,255,255,0.03) 10px, rgba(255,255,255,0.03) 20px);
}

.product-image i {
    font-size: 64px;
    color: var(--white);
    opacity: 0.9;
    position: relative;
    z-index: 1;
    filter: drop-shadow(0 4px 12px rgba(0,0,0,0.15));
}

.product-info {
    padding: 22px;
}

.product-info h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: var(--text-dark);
    font-weight: 600;
}

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

.product-features {
    list-style: none;
    margin-bottom: 22px;
}

.product-features li {
    padding: 7px 0;
    color: var(--text-dark);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
}

.product-features li i {
    color: #22c55e;
    font-size: 13px;
    flex-shrink: 0;
}

/* ==================== 解决方案 ==================== */
.solutions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
    gap: 20px;
}

.solution-item {
    background: var(--white);
    padding: 26px 22px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid rgba(0, 0, 0, 0.04);
    position: relative;
    overflow: hidden;
}

.solution-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary-color), var(--secondary-color));
    border-radius: 0 4px 4px 0;
    transform: scaleY(0);
    transform-origin: top;
    transition: transform 0.4s ease;
}

.solution-item:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-6px);
}

.solution-item:hover::before {
    transform: scaleY(1);
}

.solution-icon {
    width: 52px;
    height: 52px;
    background: linear-gradient(135deg, rgba(30, 90, 158, 0.08), rgba(44, 123, 229, 0.08));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
    transition: var(--transition);
}

.solution-item:hover .solution-icon {
    background: var(--primary-color);
}

.solution-icon i {
    font-size: 24px;
    color: var(--primary-color);
    transition: var(--transition);
}

.solution-item:hover .solution-icon i {
    color: var(--white);
}

.solution-item h3 {
    font-size: 17px;
    margin-bottom: 8px;
    color: var(--text-dark);
    font-weight: 600;
}

.solution-item p {
    color: var(--text-light);
    margin-bottom: 14px;
    line-height: 1.6;
    font-size: 13px;
}

.link-arrow {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
    font-size: 14px;
    padding: 6px 0;
}

.link-arrow:hover {
    gap: 14px;
    color: var(--secondary-color);
}

/* ==================== 技术架构 ==================== */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px;
}

.tech-item {
    background: var(--white);
    padding: 24px 16px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid rgba(0, 0, 0, 0.04);
    position: relative;
    overflow: hidden;
}

.tech-item::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(30, 90, 158, 0.04), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.tech-item:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-6px);
}

.tech-item:hover::after {
    opacity: 1;
}

.tech-item i {
    font-size: 38px;
    color: var(--primary-color);
    margin-bottom: 14px;
    transition: var(--transition);
    position: relative;
    z-index: 1;
}

.tech-item:hover i {
    transform: scale(1.1);
    color: var(--secondary-color);
}

.tech-item h4 {
    font-size: 15px;
    margin-bottom: 8px;
    color: var(--text-dark);
    font-weight: 600;
    position: relative;
    z-index: 1;
}

.tech-item p {
    color: var(--text-light);
    font-size: 13px;
    position: relative;
    z-index: 1;
}

/* ==================== 客户案例 ==================== */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.case-card {
    background: var(--white);
    padding: 28px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid rgba(0, 0, 0, 0.04);
    position: relative;
}

.case-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-6px);
}

.case-content i {
    font-size: 32px;
    color: var(--primary-color);
    opacity: 0.2;
    margin-bottom: 18px;
    display: block;
}

.case-content > p {
    font-size: 15px;
    color: var(--text-dark);
    line-height: 1.8;
    margin-bottom: 24px;
    font-style: italic;
}

.case-author h4 {
    font-size: 16px;
    color: var(--text-dark);
    margin-bottom: 4px;
    font-weight: 600;
}

.case-author span {
    color: var(--text-light);
    font-size: 13px;
}

/* ==================== 合作伙伴 ==================== */
.partners-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px;
}

.partner-logo {
    background: var(--white);
    padding: 24px 16px;
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    min-height: 110px;
    border: 1px solid rgba(0, 0, 0, 0.04);
    cursor: pointer;
}

.partner-logo:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-6px);
}

.partner-logo i {
    font-size: 36px;
    color: var(--primary-color);
    margin-bottom: 10px;
    transition: var(--transition);
}

.partner-logo:hover i {
    transform: scale(1.15);
    color: var(--secondary-color);
}

.partner-logo span {
    color: var(--text-light);
    font-size: 13px;
    font-weight: 500;
}

/* ==================== 图片占位区域增强 ==================== */
.image-placeholder-enhanced {
    width: 100%;
    height: 100%;
    min-height: 320px;
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.image-placeholder-enhanced::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 30% 70%, rgba(255,255,255,0.12) 0%, transparent 50%),
        radial-gradient(circle at 70% 30%, rgba(255,255,255,0.08) 0%, transparent 50%);
    z-index: 1;
}

.image-placeholder-enhanced::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        repeating-linear-gradient(0deg, transparent, transparent 40px, rgba(255,255,255,0.03) 40px, rgba(255,255,255,0.03) 41px),
        repeating-linear-gradient(90deg, transparent, transparent 40px, rgba(255,255,255,0.03) 40px, rgba(255,255,255,0.03) 41px);
}

.image-placeholder-enhanced i {
    font-size: 64px;
    color: rgba(255, 255, 255, 0.9);
    position: relative;
    z-index: 2;
    filter: drop-shadow(0 4px 12px rgba(0,0,0,0.15));
    margin-bottom: 16px;
}

.image-placeholder-enhanced span {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.95);
    font-weight: 600;
    position: relative;
    z-index: 2;
}

/* ==================== 数字计数器动画 ==================== */
.stat-number.animate {
    animation: countIn 1.5s ease forwards;
}

@keyframes countIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==================== 波纹效果 ==================== */
.wave-divider {
    position: relative;
    height: 60px;
    overflow: hidden;
}

.wave-divider svg {
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 60px;
}

/* ==================== 页脚 ==================== */
.footer {
    background: linear-gradient(180deg, #1a2942 0%, #152238 100%);
    color: var(--white);
    padding: 38px 0 16px;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), #4facfe);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 30px;
    margin-bottom: 28px;
}

.footer-col h3 {
    font-size: 17px;
    margin-bottom: 16px;
    position: relative;
    padding-bottom: 10px;
    font-weight: 600;
}

.footer-col h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 36px;
    height: 2px;
    background: linear-gradient(90deg, var(--secondary-color), #4facfe);
    border-radius: 2px;
}

.footer-col p {
    color: #a8b8cc;
    line-height: 1.7;
    margin-bottom: 18px;
    font-size: 13px;
}

.footer-col ul {
    list-style: none;
}

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

.footer-col ul li a {
    color: #a8b8cc;
    text-decoration: none;
    transition: var(--transition);
    font-size: 13px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.footer-col ul li a:hover {
    color: var(--white);
    padding-left: 6px;
}

.contact-info li {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #a8b8cc;
    font-size: 13px;
    margin-bottom: 12px;
}

.contact-info li i {
    color: var(--secondary-color);
    width: 18px;
    font-size: 14px;
    flex-shrink: 0;
}

.social-links {
    display: flex;
    gap: 12px;
    margin-top: 18px;
}

.social-links a {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    text-decoration: none;
    transition: var(--transition);
    font-size: 17px;
}

.social-links a:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(30, 90, 158, 0.3);
}

.footer-bottom {
    text-align: center;
    padding-top: 22px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    color: #a8b8cc;
    font-size: 13px;
}

/* ==================== 返回顶部 ==================== */
.back-to-top {
    position: fixed;
    bottom: 36px;
    right: 36px;
    width: 48px;
    height: 48px;
    border-radius: 14px;
    background: var(--primary-color);
    color: var(--white);
    border: none;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(30, 90, 158, 0.3);
    z-index: 999;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--secondary-color);
    transform: translateY(-4px);
    box-shadow: 0 8px 28px rgba(30, 90, 158, 0.4);
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 30px;
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }

    .nav {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--white);
        box-shadow: var(--shadow-lg);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.35s ease;
    }

    .nav.active {
        max-height: 440px;
    }

    .nav ul {
        flex-direction: column;
        padding: 20px;
        gap: 6px;
    }

    .nav a {
        display: block;
        padding: 10px 16px;
        border-radius: 8px;
    }

    .banner {
        height: 380px;
    }

    .banner-slide .container {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .banner-visual,
    .banner-visual-data {
        display: none;
    }

    .banner-content h1 {
        font-size: 24px;
    }

    .banner-content .banner-subtitle {
        font-size: 14px;
    }

    .banner-stats {
        gap: 10px;
    }

    .banner-stat {
        padding: 5px 10px;
    }

    .banner-stat-val {
        font-size: 17px;
    }

    .banner-tags {
        gap: 6px;
    }

    .banner-tag {
        font-size: 11px;
        padding: 3px 10px;
    }

    .section-title h2 {
        font-size: 26px;
    }

    .products-grid,
    .solutions-grid,
    .cases-grid {
        grid-template-columns: 1fr;
    }

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

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 28px;
    }
}

@media (max-width: 480px) {
    .banner {
        height: 340px;
    }

    .banner-content h1 {
        font-size: 20px;
    }

    .banner-content .banner-subtitle {
        font-size: 13px;
    }

    .banner-stats {
        gap: 8px;
    }

    .banner-stat {
        padding: 4px 8px;
    }

    .banner-stat-val {
        font-size: 15px;
    }

    .banner-stat-label {
        font-size: 11px;
    }

    .banner-tags {
        gap: 5px;
    }

    .banner-tag {
        font-size: 10px;
        padding: 2px 8px;
    }

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

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

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

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 42px;
        height: 42px;
    }
}