* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

:root {
    --primary-blue: #165DFF;
    --secondary-blue: #4080FF;
    --deep-blue: #0E42B3;
    --white: #FFFFFF;
    --light-gray: #F5F7FA;
    --text-dark: #333333;
    --text-medium: #666666;
    --text-light: #999999;
    --container-width: 1200px;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    color: var(--text-dark);
    background-color: var(--white);
    line-height: 1.6;
}

ul {
    list-style: none;
}

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

img {
    max-width: 100%;
    display: block;
}

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

.btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: 4px;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-size: 16px;
}

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

.btn-primary:hover {
    background-color: var(--deep-blue);
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(22, 93, 255, 0.15);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-blue);
    border: 1px solid var(--primary-blue);
}

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

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: var(--primary-blue);
    border-radius: 3px;
}

.section-title p {
    font-size: 16px;
    color: var(--text-medium);
    max-width: 700px;
    margin: 0 auto;
}

/* 导航栏 */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--white);
    z-index: 999;
    transition: var(--transition);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

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

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

.nav-list {
    display: flex;
    align-items: center;
    gap: 40px;
}

.nav-item a {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-dark);
    position: relative;
}

.nav-item a:hover,
.nav-item a.active {
    color: var(--primary-blue);
}

.nav-item a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-blue);
    transition: var(--transition);
}

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

.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.search-box {
    position: relative;
}

.search-box input {
    padding: 8px 12px 8px 36px;
    border: 1px solid #E5E6EB;
    border-radius: 4px;
    outline: none;
    transition: var(--transition);
    font-size: 14px;
}

.search-box input:focus {
    border-color: var(--primary-blue);
}

.search-box::before {
    content: '🔍';
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 14px;
}

.mobile-menu-btn {
    display: none;
    font-size: 24px;
    cursor: pointer;
}

/* 首屏Hero */
.hero {
    margin-top: 80px;
    height: 680px;
    background: linear-gradient(135deg, #165DFF 0%, #0E42B3 100%);
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('../images/hero.jpg') center/cover no-repeat;
    opacity: 0.1;
}

.hero-wrap {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 60px;
}

.hero-content h1 {
    font-size: 48px;
    font-weight: 700;
    color: var(--white);
    line-height: 1.2;
    margin-bottom: 24px;
}

.hero-content p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-btns {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.hero-btns .btn-outline {
    color: var(--white);
    border-color: var(--white);
}

.hero-btns .btn-outline:hover {
    background-color: var(--white);
    color: var(--primary-blue);
}

.hero-img-placeholder {
    width: 100%;
    height: 450px;
    background-color: rgba(255, 255, 255, 0.1);
    border: 2px dashed rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 18px;
}

/* 核心优势 */
.advantages {
    padding: 100px 0;
    background-color: var(--white);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.advantage-card {
    padding: 40px 30px;
    border-radius: 8px;
    background-color: var(--white);
    border: 1px solid #F0F2F5;
    transition: var(--transition);
    text-align: center;
}

.advantage-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(22, 93, 255, 0.08);
    border-color: var(--primary-blue);
}

.advantage-icon {
    width: 60px;
    height: 60px;
    background-color: rgba(22, 93, 255, 0.1);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 auto 24px;
    font-size: 28px;
    color: var(--primary-blue);
}

.advantage-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-dark);
}

.advantage-card p {
    font-size: 14px;
    color: var(--text-medium);
    line-height: 1.8;
}

/* 产品中心 */
.products {
    padding: 100px 0;
    background-color: var(--light-gray);
}

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

.tab-item {
    padding: 10px 24px;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    background-color: var(--white);
    color: var(--text-medium);
}

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

.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.product-card {
    background-color: var(--white);
    border-radius: 8px;
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid #F0F2F5;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(22, 93, 255, 0.1);
}

.product-img {
    width: 100%;
    height: 260px;
    background-color: var(--light-gray);
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.product-img-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text-light);
    font-size: 16px;
    border: 2px dashed #E5E6EB;
}

.product-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    background-color: var(--primary-blue);
    color: var(--white);
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}

.product-info {
    padding: 24px;
}

.product-info h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.product-info p {
    font-size: 14px;
    color: var(--text-medium);
    margin-bottom: 20px;
    line-height: 1.6;
    min-height: 45px;
}

.product-more {
    display: inline-flex;
    align-items: center;
    font-size: 14px;
    font-weight: 500;
    color: var(--primary-blue);
    gap: 6px;
}

.product-more:hover {
    gap: 10px;
}

/* 解决方案 */
.solutions {
    padding: 100px 0;
    background-color: var(--white);
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.solution-card {
    border-radius: 8px;
    overflow: hidden;
    position: relative;
    height: 380px;
}

.solution-img {
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, rgba(0,0,0,0) 0%, rgba(14, 66, 179, 0.8) 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.solution-img-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--light-gray);
    z-index: 1;
    border: 2px dashed #E5E6EB;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text-light);
}

.solution-content {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 40px 30px;
    z-index: 3;
    color: var(--white);
}

.solution-content h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 12px;
}

.solution-content p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 20px;
    opacity: 0.9;
}

.solution-content .btn-outline {
    color: var(--white);
    border-color: var(--white);
    padding: 8px 24px;
    font-size: 14px;
}

.solution-content .btn-outline:hover {
    background-color: var(--white);
    color: var(--primary-blue);
}

/* 合作品牌 */
.brands {
    padding: 80px 0;
    background-color: var(--light-gray);
}

.brands-wrap {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 40px;
}

.brand-item {
    width: 160px;
    height: 80px;
    background-color: var(--white);
    border-radius: 4px;
    display: flex;
    justify-content: center;
    align-items: center;
    border: 1px solid #F0F2F5;
    transition: var(--transition);
    color: var(--text-light);
    font-size: 14px;
}

.brand-item:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 16px rgba(22, 93, 255, 0.08);
    border-color: var(--primary-blue);
}

/* 关于我们 */
.about {
    padding: 100px 0;
    background-color: var(--white);
}

.about-wrap {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-img-placeholder {
    width: 100%;
    height: 450px;
    background-color: var(--light-gray);
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    border: 2px dashed #E5E6EB;
    color: var(--text-light);
}

.about-content h2 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-dark);
    position: relative;
    padding-bottom: 12px;
}

.about-content h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background-color: var(--primary-blue);
    border-radius: 3px;
}

.about-content .desc {
    font-size: 16px;
    color: var(--text-medium);
    line-height: 1.8;
    margin-bottom: 30px;
}

.about-nums {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 40px;
}

.num-item h3 {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 8px;
}

.num-item p {
    font-size: 14px;
    color: var(--text-medium);
}

/* CTA联系 */
.cta {
    padding: 80px 0;
    background: linear-gradient(135deg, #165DFF 0%, #0E42B3 100%);
    text-align: center;
}

.cta-content h2 {
    font-size: 36px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 20px;
}

.cta-content p {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.85);
    max-width: 700px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

.contact-info {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.contact-item {
    color: var(--white);
    text-align: center;
}

.contact-item h4 {
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 8px;
    opacity: 0.9;
}

.contact-item p {
    font-size: 18px;
    font-weight: 600;
}

/* 页脚 */
footer {
    background-color: #0F172A;
    color: rgba(255, 255, 255, 0.7);
    padding: 80px 0 20px;
}

.footer-top {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 60px;
}

.footer-logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 20px;
}

.footer-desc {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 24px;
}

.footer-col h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 24px;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
}

.footer-links a:hover {
    color: var(--primary-blue);
    padding-left: 5px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    text-align: center;
    font-size: 14px;
}

/* 响应式适配 */
@media (max-width: 1200px) {
    .hero-content h1 {
        font-size: 40px;
    }
    .section-title h2 {
        font-size: 32px;
    }
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .nav-list, .search-box {
        display: none;
    }
    .mobile-menu-btn {
        display: block;
    }
    .hero-wrap, .about-wrap {
        grid-template-columns: 1fr;
    }
    .hero {
        height: auto;
        padding: 80px 0;
    }
    .hero-content {
        text-align: center;
    }
    .hero-btns {
        justify-content: center;
    }
    .products-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-top {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .advantages-grid, .solutions-grid, .products-grid, .about-nums {
        grid-template-columns: 1fr;
    }
    .hero-content h1 {
        font-size: 32px;
    }
    .section-title h2 {
        font-size: 28px;
    }
    .footer-top {
        grid-template-columns: 1fr;
    }
    .contact-info {
        gap: 30px;
    }
}

/* 子页面通用样式 */
.page-header {
    margin-top: 80px;
    padding: 80px 0;
    background: linear-gradient(135deg, #165DFF 0%, #0E42B3 100%);
    text-align: center;
    color: var(--white);
}

.page-header h1 {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 16px;
}

.page-header p {
    font-size: 18px;
    opacity: 0.9;
}

.page-content {
    padding: 100px 0;
}

/* 联系表单 */
.contact-form {
    max-width: 800px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-dark);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #E5E6EB;
    border-radius: 4px;
    font-size: 16px;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}