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

:root {
    /* 颜色变量 */
    --color-primary: #FF6900; /* 小米橙 */
    --color-secondary: #1F2937; /* 深灰 */
    --color-light-gray: #F3F4F6; /* 浅灰 */
    --color-huawei-blue: #007BFF; /* 华为蓝 */
    --color-white: #FFFFFF;
    --color-black: #000000;
    
    /* 字体 */
    --font-family: 'Noto Sans SC', sans-serif;
    
    /* 间距 */
    --spacing-xs: 10px;
    --spacing-sm: 20px;
    --spacing-md: 40px;
    --spacing-lg: 80px;
    --spacing-xl: 120px;
    
    /* 响应式断点 */
    --breakpoint-mobile: 768px;
    --breakpoint-tablet: 992px;
    --breakpoint-desktop: 1200px;
}

body {
    font-family: var(--font-family);
    font-weight: 400;
    line-height: 1.6;
    color: var(--color-secondary);
    background-color: var(--color-white);
}

/* 容器样式 */
.container {
    width: 100%;
    max-width: 1920px;
    margin: 0 auto;
    padding: 0 200px;
}

@media (max-width: 1200px) {
    .container {
        padding: 0 120px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 40px;
    }
}

/* 通用间距 */
.section-spacing {
    margin-bottom: var(--spacing-lg);
}

.subsection-spacing {
    margin-bottom: var(--spacing-md);
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: 4px;
    font-weight: 500;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    font-size: 16px;
}

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

.btn-primary:hover {
    background-color: #e55c00;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 105, 0, 0.3);
}

.btn-secondary {
    background-color: var(--color-white);
    color: var(--color-secondary);
    border-color: var(--color-secondary);
}

.btn-secondary:hover {
    background-color: var(--color-light-gray);
    transform: translateY(-2px);
}

/* 卡片样式 */
.card {
    background: var(--color-white);
    border-radius: 8px;
    padding: var(--spacing-md);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

/* 标题样式 */
.section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.section-subtitle {
    font-size: 18px;
    color: #666;
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

/* 进度条样式 */
.progress-bar {
    width: 60px;
    height: 4px;
    background-color: var(--color-primary);
    margin: 0 auto var(--spacing-md);
}

/* 顶部导航样式 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-light-gray);
    z-index: 1000;
    padding: 15px 0;
}

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

.logo a {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--color-secondary);
}

.logo-img {
    width: 50px;
    height: 50px;
    margin-right: 15px;
}

.logo-img img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.logo-text h1 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 4px;
}

.logo-text p {
    font-size: 12px;
    color: var(--color-primary);
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 40px;
}

.nav-item a {
    text-decoration: none;
    color: var(--color-secondary);
    font-weight: 500;
    font-size: 16px;
    transition: color 0.3s ease;
}

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

.nav-item.phone a {
    color: var(--color-primary);
    font-weight: 700;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background-color: var(--color-secondary);
    transition: 0.3s;
}

/* 移动端菜单 */
.mobile-menu {
    display: none;
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    padding: var(--spacing-md);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    z-index: 999;
}

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

.mobile-nav-list li {
    margin-bottom: 20px;
}

.mobile-nav-list a {
    text-decoration: none;
    color: var(--color-secondary);
    font-size: 18px;
    font-weight: 500;
    display: block;
    padding: 10px 0;
}

/* 底部样式 */
.footer {
    background-color: var(--color-secondary);
    color: var(--color-white);
}

.contact-section {
    padding: var(--spacing-lg) 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
}

.contact-item i {
    font-size: 24px;
    color: var(--color-primary);
    margin-top: 5px;
}

.contact-info h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: var(--color-white);
}

.contact-info p {
    color: #ccc;
    margin-bottom: 5px;
}

.qrcode-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.qrcode-item {
    width: 80px;
    height: 80px;
}

.qrcode-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 4px;
}

.secondary-nav {
    background-color: #2D3748;
    padding: 20px 0;
}

.secondary-nav-list {
    display: flex;
    justify-content: center;
    list-style: none;
    gap: 40px;
    flex-wrap: wrap;
}

.secondary-nav-list a {
    color: var(--color-white);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
}

.secondary-nav-list a:hover {
    color: var(--color-primary);
}

.copyright {
    background-color: #1A202C;
    padding: 20px 0;
    text-align: center;
}

.copyright p {
    color: #999;
    font-size: 14px;
    margin-bottom: 5px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-list {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .mobile-menu.active {
        display: block;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .secondary-nav-list {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
}