/* ===== 基础样式 v2 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #0066cc;
    --primary-dark: #004499;
    --secondary-color: #00b4d8;
    --text-dark: #1a1a2e;
    --text-gray: #666;
    --text-light: #999;
    --bg-white: #ffffff;
    --bg-gray: #f5f7fa;
    --bg-dark: #0f1419;
    --border-color: #e1e8ed;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
    --transition: all 0.3s ease;
}

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

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

.section {
    padding: 80px 0;
}

.section-white {
    background-color: var(--bg-white);
}

.section-gray {
    background-color: var(--bg-gray);
}

.section-dark {
    background-color: var(--bg-dark);
    color: #fff;
}

.section-dark .section-title,
.section-dark .section-subtitle,
.section-dark h3,
.section-dark h4 {
    color: #fff;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 15px;
}

.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-gray);
    margin-bottom: 50px;
}

.subsection-title {
    text-align: center;
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--text-dark);
    margin: 60px 0 40px;
}

.page-header {
    background: linear-gradient(135deg, #0a1628 0%, #1a365d 50%, #0f1419 100%);
    padding: 100px 0 60px;
    text-align: center;
    color: #fff;
}

.page-header h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 15px;
}

.page-header p {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.8);
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 30px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: #fff;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 102, 204, 0.3);
}

.btn-secondary {
    background: transparent;
    color: #fff;
    border: 2px solid #fff;
}

.btn-secondary:hover {
    background: #fff;
    color: var(--primary-color);
}

.btn-block {
    width: 100%;
    text-align: center;
}

/* ===== 导航栏 ===== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(15, 20, 25, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 15px 0;
    transition: var(--transition);
}

.site-header.scrolled {
    background: rgba(15, 20, 25, 0.98);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    object-fit: cover;
}

.logo-icon {
    font-size: 1.8rem;
}

.logo-text {
    font-size: 1.3rem;
    font-weight: 700;
    color: #fff;
}

.desktop-nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
    align-items: center;
}

.desktop-nav a {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.desktop-nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transition: var(--transition);
}

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

.desktop-nav a.active {
    color: var(--secondary-color);
}

.contact-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 0.9rem;
}

.contact-btn:hover {
    box-shadow: 0 4px 15px rgba(0, 102, 204, 0.4);
}

.contact-btn::after {
    display: none;
}

.mobile-menu-btn {
    display: none;
    color: #fff;
    font-size: 1.5rem;
    cursor: pointer;
}

.mobile-nav {
    display: none;
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: rgba(15, 20, 25, 0.98);
    padding: 20px;
    z-index: 999;
}

.mobile-nav ul {
    list-style: none;
}

.mobile-nav a {
    display: block;
    color: #fff;
    text-decoration: none;
    padding: 15px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 1rem;
}

/* ===== Hero Banner ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0a1628 0%, #1a365d 50%, #0f1419 100%);
    padding-top: 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('Images/home1.jpeg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    z-index: 0;
}

.hero-content {
    animation: fadeInUp 1s ease;
    z-index: 3;
    position: absolute;
    top: 10%;
    left: 0;
    right: 0;
    margin: 0 auto;
    text-align: center;
    width: 100%;
    max-width: 900px;
    padding: 0 20px;
}

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

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: #0a1628;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #1a1a2e;
}

.hero-desc {
    font-size: 1.1rem;
    color: #b0b0b0;
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 50px;
}

/* ===== Hero 标签 ===== */
.hero-tags {
    position: absolute;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
    max-width: 900px;
    padding: 0 20px;
    z-index: 3;
}

.tag-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 30px;
    color: #fff;
    font-size: 0.95rem;
    transition: var(--transition);
    animation: fadeInUp 1s ease;
}

.tag-item:nth-child(1) { animation-delay: 0.2s; }
.tag-item:nth-child(2) { animation-delay: 0.3s; }
.tag-item:nth-child(3) { animation-delay: 0.4s; }
.tag-item:nth-child(4) { animation-delay: 0.5s; }
.tag-item:nth-child(5) { animation-delay: 0.6s; }

.tag-item:hover {
    background: rgba(0, 180, 216, 0.3);
    border-color: rgba(0, 180, 216, 0.5);
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 180, 216, 0.3);
}

.tag-icon {
    font-size: 1.2rem;
}

.tag-text {
    font-weight: 500;
    white-space: nowrap;
}

/* ===== 核心优势 ===== */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.advantage-card {
    background: var(--bg-white);
    padding: 40px 30px;
    border-radius: 16px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.advantage-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-color);
}

.advantage-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.advantage-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.advantage-card p {
    color: var(--text-gray);
    line-height: 1.6;
}

/* ===== 平台支持 ===== */
.platforms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.platform-card {
    background: var(--bg-white);
    padding: 40px 30px;
    border-radius: 16px;
    text-align: center;
    transition: var(--transition);
    border: 2px solid transparent;
}

.platform-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-color);
}

.platform-logo {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin: 0 auto 20px;
    font-weight: bold;
}

.platform-mi {
    background: linear-gradient(135deg, #ff6900, #ff9500);
    color: #fff;
}

.platform-tuya {
    background: linear-gradient(135deg, #00d4aa, #00b4d8);
    color: #fff;
}

.platform-homekit {
    background: linear-gradient(135deg, #666, #999);
    color: #fff;
}

.platform-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
}

.platform-card p {
    color: var(--text-gray);
    margin-bottom: 20px;
}

.platform-card ul {
    list-style: none;
    text-align: left;
}

.platform-card ul li {
    padding: 8px 0;
    color: var(--text-gray);
    border-bottom: 1px solid var(--border-color);
}

.platform-card ul li:last-child {
    border-bottom: none;
}

/* ===== 家庭智能方案 ===== */
.home-solutions-tabs {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 12px 25px;
    border: 2px solid var(--primary-color);
    background: transparent;
    color: var(--primary-color);
    border-radius: 25px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn.active,
.tab-btn:hover {
    background: var(--primary-color);
    color: #fff;
}

.home-solutions-content {
    margin-top: 40px;
}

.solution-card-lg {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 40px;
    background: var(--bg-white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow);
    margin-bottom: 40px;
    transition: var(--transition);
}

.solution-card-lg:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-5px);
}

.solution-image {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 300px;
}

.solution-icon {
    font-size: 6rem;
}

.solution-content {
    padding: 40px;
}

.solution-content h3 {
    font-size: 1.8rem;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.solution-content > p {
    color: var(--text-gray);
    margin-bottom: 20px;
    line-height: 1.6;
}

.feature-list {
    list-style: none;
    margin-bottom: 25px;
}

.feature-list li {
    padding: 8px 0;
    padding-left: 25px;
    position: relative;
    color: var(--text-gray);
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

/* ===== 产品展示 ===== */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 25px;
}

.product-card {
    background: var(--bg-white);
    padding: 30px 20px;
    border-radius: 12px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-color);
}

.product-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.product-card h4 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.product-card p {
    color: var(--text-gray);
    font-size: 0.9rem;
}

/* ===== 企业智能方案 ===== */
.business-solutions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.business-card {
    background: rgba(255, 255, 255, 0.05);
    padding: 40px 30px;
    border-radius: 16px;
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.business-card:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.business-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.business-card h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: #fff;
}

.business-card > p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 20px;
    line-height: 1.6;
}

.business-card ul {
    list-style: none;
}

.business-card ul li {
    padding: 8px 0;
    padding-left: 20px;
    position: relative;
    color: rgba(255, 255, 255, 0.8);
}

.business-card ul li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
}

/* ===== 技术服务 ===== */
.tech-services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}

.tech-service-card {
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.2), rgba(0, 180, 216, 0.2));
    padding: 35px 25px;
    border-radius: 12px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(0, 102, 204, 0.3);
}

.tech-service-card:hover {
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.3), rgba(0, 180, 216, 0.3));
    transform: translateY(-5px);
}

/* 技术开发服务第二行（深色背景） */
.tech-services-grid-second-row {
    margin-top: 25px;
}

.tech-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.tech-service-card h4 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: #fff;
}

.tech-service-card p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
}

/* ===== 服务体系 ===== */
.service-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 60px;
}

.service-step {
    flex: 0 0 auto;
    text-align: center;
    max-width: 140px;
}

.step-number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: bold;
    margin: 0 auto 15px;
}

.step-content h3 {
    font-size: 1rem;
    margin-bottom: 8px;
    color: var(--text-dark);
}

.step-content p {
    font-size: 0.85rem;
    color: var(--text-gray);
    line-height: 1.4;
}

.service-arrow {
    font-size: 2rem;
    color: var(--primary-color);
    flex: 0 0 auto;
}

.service-guarantee {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 25px;
}

.guarantee-item {
    text-align: center;
    padding: 30px 20px;
    background: linear-gradient(135deg, #f8f9fa, #ffffff);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.guarantee-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin: 0 auto 15px;
    font-weight: bold;
}

.guarantee-item h4 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.guarantee-item p {
    color: var(--text-gray);
    font-size: 0.9rem;
}

/* ===== 案例展示 ===== */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.case-card {
    background: var(--bg-white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.case-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.case-image {
    height: 200px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
}

.case-placeholder {
    font-size: 5rem;
}

.case-content {
    padding: 30px;
}

.case-tag {
    display: inline-block;
    padding: 5px 15px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
    border-radius: 15px;
    font-size: 0.85rem;
    margin-bottom: 15px;
}

.case-content h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.case-content > p {
    color: var(--text-gray);
    margin-bottom: 20px;
    line-height: 1.6;
}

.case-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.case-stats span {
    color: var(--text-gray);
    font-size: 0.9rem;
}

/* ===== 解决方案详情页样式 ===== */
.solution-detail {
    max-width: 1000px;
    margin: 0 auto;
}

.solution-detail > h2 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: var(--text-dark);
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 10px;
}

.solution-detail > p {
    font-size: 1.05rem;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 30px;
}

/* 功能网格 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    margin-bottom: 40px;
}

.feature-box {
    background: var(--bg-white);
    padding: 25px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
}

.feature-box:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.feature-box h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.feature-box > p {
    color: var(--text-gray);
    line-height: 1.6;
    font-size: 0.95rem;
}

/* 场景列表 */
.scenarios-list {
    margin-bottom: 40px;
}

.scenario-item {
    background: var(--bg-gray);
    padding: 25px;
    border-radius: 12px;
    margin-bottom: 20px;
    border-left: 4px solid var(--primary-color);
}

.scenario-item h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.scenario-item > p {
    color: var(--text-gray);
    line-height: 1.7;
}

/* 户型列表 */
.house-types {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-bottom: 40px;
}

.house-type {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 30px;
    border-radius: 12px;
    color: white;
    text-align: center;
}

.house-type h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.house-type > p {
    opacity: 0.95;
    line-height: 1.6;
}

/* 设备列表 */
.device-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.device-item {
    background: var(--bg-white);
    padding: 20px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.device-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.device-item h4 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.device-item > p {
    color: var(--text-gray);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* 效益分析 */
.benefits-box {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-bottom: 40px;
}

.benefit-item {
    background: var(--bg-white);
    padding: 25px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    border-top: 4px solid var(--secondary-color);
}

.benefit-item h3 {
    font-size: 1.2rem;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.benefit-item > p {
    color: var(--text-gray);
    line-height: 1.7;
}

/* CTA部分 */
.cta-section {
    text-align: center;
    padding: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 12px;
    color: white;
}

.cta-section h3 {
    font-size: 1.8rem;
    margin-bottom: 25px;
}

/* 家庭服务和企业服务方案页面 */
.home-solutions-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 12px 25px;
    border: 2px solid var(--primary-color);
    background: transparent;
    color: var(--primary-color);
    font-size: 1rem;
    font-weight: 500;
    border-radius: 25px;
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn:hover,
.tab-btn.active {
    background: var(--primary-color);
    color: white;
}

.home-solutions-content {
    display: none;
}

.home-solutions-content.active {
    display: block;
}

.solution-card-lg {
    background: var(--bg-white);
    border-radius: 15px;
    box-shadow: var(--shadow);
    overflow: hidden;
    margin-bottom: 30px;
    display: flex;
    flex-direction: row;
    transition: var(--transition);
}

.solution-card-lg:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-3px);
}

@media (max-width: 768px) {
    .solution-card-lg {
        flex-direction: column;
    }
}

.solution-card-lg[data-category="all"],
.solution-card-lg[data-category="whole"],
.solution-card-lg[data-category="elder"],
.solution-card-lg[data-category="child"] {
    display: block;
}

.solution-image {
    width: 100%;
    min-height: 250px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
}

.solution-icon {
    font-size: 6rem;
}

.solution-content {
    padding: 30px;
}

.solution-content h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.solution-content > p {
    color: var(--text-gray);
    margin-bottom: 20px;
    line-height: 1.7;
}

.feature-list {
    list-style: none;
    margin-bottom: 25px;
}

.feature-list li {
    padding: 8px 0;
    padding-left: 25px;
    position: relative;
    color: var(--text-gray);
}

.feature-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

.products-section {
    margin-top: 50px;
}

.subsection-title {
    font-size: 1.6rem;
    text-align: center;
    margin-bottom: 30px;
    color: var(--text-dark);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.product-card {
    background: var(--bg-white);
    padding: 25px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.product-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.product-card h4 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.product-card > p {
    color: var(--text-gray);
    font-size: 0.9rem;
    line-height: 1.5;
}

.business-solutions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.business-card {
    background: var(--bg-white);
    border-radius: 15px;
    box-shadow: var(--shadow);
    padding: 30px;
    transition: var(--transition);
}

.business-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.business-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.business-card h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.business-card > p {
    color: var(--text-gray);
    margin-bottom: 20px;
    line-height: 1.6;
}

.business-card ul {
    list-style: none;
    margin-bottom: 20px;
}

.business-card ul li {
    padding: 6px 0;
    padding-left: 20px;
    position: relative;
    color: var(--text-gray);
    font-size: 0.95rem;
}

.business-card ul li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

.tech-services {
    margin-top: 60px;
}

.tech-services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}

.tech-service-card {
    background: var(--bg-white);
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

.tech-service-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

/* 技术开发服务第二行 */
.tech-services-grid-second-row {
    margin-top: 25px;
}

.tech-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.tech-service-card h4 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.tech-service-card > p {
    color: var(--text-gray);
    line-height: 1.6;
    font-size: 0.95rem;
}

.case-stats strong {
    color: var(--primary-color);
    font-size: 1.2rem;
}

/* ===== 关于我们 ===== */
.about-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 60px;
    align-items: start;
}

.about-text h3 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.about-text > p {
    color: var(--text-gray);
    margin-bottom: 15px;
    line-height: 1.8;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 40px;
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.stat-label {
    color: var(--text-gray);
    font-size: 0.9rem;
}

.about-features {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.feature-item {
    padding: 30px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 16px;
    color: #fff;
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.feature-item h4 {
    font-size: 1.3rem;
    margin-bottom: 10px;
}

.feature-item p {
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.6;
}

/* ===== 联系我们 ===== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
}

.contact-info h3,
.contact-form h3 {
    font-size: 1.5rem;
    margin-bottom: 30px;
    color: #fff;
}

.contact-item {
    display: flex;
    gap: 20px;
    margin-bottom: 25px;
}

.contact-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.contact-item h4 {
    font-size: 1rem;
    margin-bottom: 5px;
    color: #fff;
}

.contact-item p {
    color: rgba(255, 255, 255, 0.7);
}

.contact-form {
    background: rgba(255, 255, 255, 0.05);
    padding: 40px;
    border-radius: 16px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background: rgba(255, 255, 255, 0.15);
}

.form-group select option {
    background: var(--bg-dark);
    color: #fff;
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* ===== 联系我们 - 白色背景版本 ===== */
.contact-section {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 50px;
}

.contact-info-light h3,
.contact-form-light h3 {
    font-size: 1.5rem;
    margin-bottom: 30px;
    color: #333;
}

.contact-item-light {
    display: flex;
    gap: 20px;
    margin-bottom: 25px;
}

.contact-icon-light {
    font-size: 2rem;
    flex-shrink: 0;
}

.contact-details h4 {
    font-size: 1rem;
    margin-bottom: 5px;
    color: #333;
}

.contact-details p {
    color: #666;
}

.contact-form-light {
    background: #f8f9fa;
    padding: 30px;
    border-radius: 16px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

.contact-form-light h3 {
    font-size: 1.3rem;
    margin-bottom: 20px;
}

.form-group-light {
    margin-bottom: 15px;
}

.form-group-light label {
    display: block;
    margin-bottom: 6px;
    color: #333;
    font-weight: 500;
    font-size: 0.9rem;
}

.form-group-light input,
.form-group-light select,
.form-group-light textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    background: #fff;
    color: #333;
    font-size: 0.95rem;
    transition: var(--transition);
    box-sizing: border-box;
}

.form-group-light input:focus,
.form-group-light select:focus,
.form-group-light textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.form-group-light select option {
    background: #fff;
    color: #333;
}

.form-group-light textarea {
    resize: vertical;
    min-height: 80px;
    font-family: inherit;
}

/* ===== 关于我们 - 二维码区域 ===== */
.qr-section-light {
    background: #f8f9fa;
    padding: 30px;
    border-radius: 16px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

.qr-section-light h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: #333;
}

.qr-subtitle {
    color: #666;
    margin-bottom: 25px;
    font-size: 0.95rem;
}

.qr-section-light .qr-grid {
    margin-top: 20px;
}

/* ===== 页脚 ===== */
.site-footer {
    background: #0a0e11;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: #fff;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 15px;
}

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

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

.footer-section a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--secondary-color);
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    font-size: 0.9rem;
}

.social-links a:hover {
    background: var(--primary-color);
    color: #fff;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
}

/* ===== 平滑滚动 ===== */
html {
    scroll-behavior: smooth;
}

/* ===== 全局移动端基础优化 ===== */
* {
    -webkit-tap-highlight-color: transparent;
}

.hero-bg img,
.solution-image img,
.section img:not(.qr-image img):not(.qr-item img):not(.logo-img) {
    max-width: 100%;
    height: auto;
}

@media (hover: none) and (pointer: coarse) {
    .btn:hover {
        transform: none;
        box-shadow: none;
    }
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 2.8rem;
    }

    .solution-card-lg {
        flex-direction: column;
    }

    .solution-image {
        min-height: 200px;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

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

    .qr-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .qr-section-light {
        padding: 20px;
    }

    .qr-card {
        padding: 12px;
    }

    .qr-image img {
        max-width: 120px !important;
        width: 100% !important;
        height: auto !important;
        aspect-ratio: 1 / 1;
        object-fit: contain;
    }

    .qr-card h3 {
        font-size: 1rem;
    }

    .qr-card p {
        font-size: 0.8rem;
    }

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

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

    .contact-section {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

@media (max-width: 768px) {
    .desktop-nav {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
        font-size: 1.5rem;
        width: 44px;
        height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;
    }

    .mobile-nav.active {
        display: block;
    }

    .mobile-nav a {
        display: block;
        padding: 14px 20px;
        min-height: 48px;
        line-height: 1.4;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .hero-desc {
        font-size: 0.95rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .hero-buttons .btn {
        width: 100%;
        max-width: 300px;
    }

    .hero-tags {
        bottom: 40px;
        gap: 10px;
        flex-wrap: wrap;
    }

    .tag-item {
        padding: 10px 16px;
        font-size: 0.85rem;
    }

    .tag-icon {
        font-size: 1rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .section {
        padding: 50px 0;
    }

    .container {
        padding: 0 16px;
    }

    .service-flow {
        flex-direction: column;
    }

    .service-arrow {
        transform: rotate(90deg);
    }

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

    .qr-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .qr-section-light {
        padding: 20px;
    }

    .qr-card {
        padding: 12px;
    }

    .qr-image img {
        max-width: 120px !important;
        width: 100% !important;
        height: auto !important;
        aspect-ratio: 1 / 1;
        object-fit: contain;
    }

    .qr-card h3 {
        font-size: 1rem;
    }

    .qr-card p {
        font-size: 0.8rem;
    }

    .tech-services-grid {
        grid-template-columns: 1fr;
    }

    .contact-section {
        grid-template-columns: 1fr;
    }

    .qr-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }

    .qr-card {
        padding: 15px;
    }

    .qr-image img {
        width: 100% !important;
        height: auto !important;
        max-width: 150px;
        aspect-ratio: 1 / 1;
        object-fit: contain;
    }

    .site-footer .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .home-solutions-tabs {
        gap: 8px;
    }

    .tab-btn {
        padding: 10px 18px;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.6rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .section-title {
        font-size: 1.6rem;
    }

    .section {
        padding: 40px 0;
    }

    .container {
        padding: 0 12px;
    }

    .advantages-grid,
    .platforms-grid,
    .business-solutions-grid,
    .cases-grid,
    .tech-services-grid {
        grid-template-columns: 1fr;
    }

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

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

    .qr-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .qr-section-light {
        padding: 20px;
    }

    .qr-card {
        padding: 12px;
    }

    .qr-image img {
        max-width: 120px !important;
        width: 100% !important;
        height: auto !important;
        aspect-ratio: 1 / 1;
        object-fit: contain;
    }

    .qr-card h3 {
        font-size: 1rem;
    }

    .qr-card p {
        font-size: 0.8rem;
    }

    .hero-tags {
        flex-wrap: wrap;
        justify-content: center;
    }

    .tag-item {
        font-size: 0.8rem;
        padding: 8px 12px;
    }

    .btn {
        padding: 12px 24px;
        font-size: 0.95rem;
    }

    .site-footer .footer-bottom p {
        font-size: 0.85rem;
    }

    .footer-section .footer-links li a {
        padding: 8px 0;
        font-size: 0.9rem;
    }
}

/* ===== 动画效果 ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== 二维码弹窗样式 ===== */
.qr-modal {
    display: none;
    position: fixed;
    z-index: 9999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    animation: fadeIn 0.3s ease;
}

.qr-modal-content {
    background-color: #fff;
    margin: 10% auto;
    padding: 30px;
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    position: relative;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.qr-modal-close {
    position: absolute;
    right: 20px;
    top: 15px;
    font-size: 32px;
    font-weight: bold;
    color: #666;
    cursor: pointer;
    line-height: 1;
    transition: color 0.3s ease;
}

.qr-modal-close:hover {
    color: #333;
}

#qrModalTitle {
    text-align: center;
    margin-bottom: 25px;
    color: #333;
    font-size: 1.5rem;
}

#qrModalBody {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
}

.qr-item {
    text-align: center;
    flex: 1;
    min-width: 150px;
}

.qr-item img {
    width: 200px;
    height: 200px;
    object-fit: contain;
    border: 2px solid #f0f0f0;
    border-radius: 8px;
    margin-bottom: 10px;
    transition: border-color 0.3s ease;
}

.qr-item img:hover {
    border-color: #007bff;
}

.qr-item p {
    color: #666;
    font-size: 0.9rem;
    margin: 0;
}

/* 单个二维码时的样式 */
#qrModalBody.single-qr .qr-item {
    max-width: 250px;
    flex: 0 0 auto;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .qr-modal-content {
        width: 90%;
        margin: 20% auto;
        padding: 20px;
    }

    .qr-item img {
        width: 150px;
        height: 150px;
    }

    #qrModalTitle {
        font-size: 1.2rem;
    }
}

/* ===== 导航栏登录按钮 ===== */
.nav-login-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color)) !important;
    padding: 8px 20px !important;
    border-radius: 20px !important;
    color: white !important;
    font-weight: 500 !important;
    transition: all 0.3s ease !important;
}

.nav-login-btn:hover {
    box-shadow: 0 4px 15px rgba(0, 102, 204, 0.4) !important;
    transform: translateY(-2px) !important;
}

.nav-login-btn::after {
    display: none !important;
}

/* 移动端登录按钮样式 */
@media (max-width: 768px) {
    .mobile-nav .nav-login-btn {
        display: inline-block;
        margin-top: 10px;
        text-align: center;
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color)) !important;
        border-radius: 20px;
        border-bottom: none !important;
    }
}

/* ===== 社交媒体二维码网格 ===== */
.qr-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-top: 40px;
}

.qr-card {
    background: var(--bg-white);
    padding: 25px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

.qr-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.qr-image img {
    width: 150px;
    height: 150px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 15px;
    border: 2px solid var(--border-color);
}

.qr-card h3 {
    font-size: 1.2rem;
    margin-bottom: 8px;
    color: var(--text-dark);
}

.qr-card p {
    color: var(--text-gray);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* 移动端适配 */
@media (max-width: 992px) {
    .qr-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 576px) {
    .qr-grid {
        grid-template-columns: 1fr;
    }
}