:root {
    --primary: #2B5AED;
    --primary-light: #4B7BFF;
    --primary-dark: #1A3FA0;
    --secondary: #00D6C9;
    --dark: #1A1F3D;
    --gray: #6B7280;
    --light: #F5F7FA;
    --white: #FFFFFF;
    
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    
    --transition: all 0.3s ease;
}

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

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

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

/* 主横幅 */
.support-banner {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--white);
    padding: 180px 0 100px;
    text-align: center;
}

.support-banner h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    animation: fadeInUp 0.8s ease;
}

.support-banner p {
    font-size: 1.2rem;
    opacity: 0.9;
    animation: fadeInUp 1s ease;
}

/* 服务特点 */
.service-features {
    padding: 80px 0;
    background: var(--light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.feature-card {
    background: var(--white);
    padding: 30px;
    border-radius: var(--radius-md);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.feature-card i {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
}

.feature-card p {
    color: var(--gray);
}

/* 联系方式 */
.contact-info-support {
    padding: 80px 0;
}

.contact-info-support h2 {
    text-align: center;
    margin-bottom: 50px;
    font-size: 2rem;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.contact-card {
    text-align: center;
    padding: 40px;
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.contact-card i {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 20px;
}

.contact-card h3 {
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.contact-card p {
    font-size: 1.1rem;
    color: var(--primary);
    margin-bottom: 10px;
}

.contact-card span {
    color: var(--gray);
    font-size: 0.9rem;
}

.contact-card img {
    width: 150px;
    height: 150px;
    margin: 15px auto;
    border-radius: var(--radius-sm);
}

/* 收银机展示区域 */
.pos-showcase {
    padding: 80px 0;
    background: var(--light);
}

.pos-showcase h2 {
    text-align: center;
    margin-bottom: 30px;
    font-size: 2rem;
}

/* 搜索框 */
.search-box {
    max-width: 600px;
    margin: 0 auto 40px;
    display: flex;
    gap: 10px;
}

.search-box input {
    flex: 1;
    padding: 12px 20px;
    border: 2px solid var(--primary);
    border-radius: var(--radius-md);
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
}

.search-box input:focus {
    box-shadow: 0 0 0 3px rgba(43, 90, 237, 0.2);
}

.search-box button {
    padding: 0 20px;
    background: var(--primary);
    border: none;
    border-radius: var(--radius-md);
    color: var(--white);
    cursor: pointer;
    transition: var(--transition);
}

.search-box button:hover {
    background: var(--primary-dark);
}

/* 收银机网格 */
.pos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.pos-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.pos-image {
    position: relative;
    padding-top: 75%;
    overflow: hidden;
    cursor: pointer;
}

.pos-image img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.pos-info {
    padding: 20px;
    text-align: center;
}

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

.pos-info p {
    color: var(--gray);
    margin-bottom: 15px;
    font-size: 0.9rem;
}

/* 收银机特性标签 */
.pos-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-bottom: 15px;
}

.pos-features span {
    background: var(--primary-light);
    color: var(--white);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    transition: var(--transition);
}

.pos-features span:hover {
    background: var(--primary);
    transform: translateY(-2px);
}

/* 下载按钮样式 */
.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    background: var(--primary);
    color: var(--white);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: var(--transition);
}

.download-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 40px;
}

.page-btn {
    padding: 8px 16px;
    border: 1px solid var(--primary);
    background: var(--white);
    color: var(--primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}

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

/* 分页按钮禁用状态 */
.page-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* 图片预览模态框 */
.image-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.image-modal img {
    max-width: 90%;
    max-height: 90vh;
    object-fit: contain;
    border-radius: var(--radius-md);
}

.close-modal {
    position: absolute;
    top: 20px;
    right: 20px;
    color: var(--white);
    font-size: 2rem;
    cursor: pointer;
    transition: var(--transition);
}

.close-modal:hover {
    transform: rotate(90deg);
}

/* 动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.pos-card {
    animation: fadeIn 0.5s ease;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .support-banner {
        padding: 60px 0;
    }

    .support-banner h1 {
        font-size: 2rem;
    }

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

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

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

    .search-box {
        flex-direction: column;
    }

    .search-box button {
        width: 100%;
        padding: 12px;
    }

    .pagination {
        flex-wrap: wrap;
    }

    .pos-features {
        justify-content: flex-start;
    }
    
    .pos-features span {
        font-size: 0.75rem;
        padding: 3px 10px;
    }
}

/* 暗色模式支持 */
@media (prefers-color-scheme: dark) {
    :root {
        --white: #1A1F3D;
        --light: #2A2F4D;
        --dark: #F3F4F6;
        --gray: #9CA3AF;
    }
}

/* 性能优化 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}