:root {
    /* 主色系 */
    --primary-color: #c63323;          /* 主题色 */
    --primary-light: #e64433;          /* 主题色亮色调 */
    --primary-dark: #a62313;           /* 主题色暗色调 */
    --primary-hover: #d63c2c;          /* 主题色悬停状态 */
    
    /* 辅助色系 */
    --secondary-light: #fff5f4;        /* 浅色背景 */
    --secondary-medium: #ffdcd9;       /* 中等强调 */
    
    /* 文字颜色 */
    --text-primary: #333333;           /* 主要文字 */
    --text-secondary: #666666;         /* 次要文字 */
    --text-light: #999999;             /* 浅色文字 */
    
    /* 背景色 */
    --bg-white: #ffffff;
    --bg-light: #f5f5f5;
    --bg-dark: #2c2c2c;
    
    /* 功能色 */
    --success: #52c41a;
    --warning: #faad14;
    --error: #ff4d4f;
    
    /* 渐变色 */
    --gradient-primary: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    --gradient-light: linear-gradient(135deg, var(--secondary-light), var(--bg-white));
}

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

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
}

/* 导航栏样式 */
.main-nav {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary-color);
    transform: scaleX(0);
    transition: transform 0.3s;
}

.nav-links a:hover::after {
    transform: scaleX(1);
}

.login-btn a {
    background: var(--gradient-primary);
    color: white;
    padding: 0.8rem 1.8rem;
    border-radius: 30px;
    transition: transform 0.3s, box-shadow 0.3s;
}

.login-btn a:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(198, 51, 35, 0.3);
}

/* 主视觉区域样式 */
.hero {
    margin-top: 80px;
    padding: 6rem 0;
    background: var(--gradient-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 80px auto 0;
}

.hero-content {
    flex: 1;
    padding: 2rem;
}

.hero h1 {
    font-size: 3.5rem;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero p {
    font-size: 1.25rem;
    color: #666;
    margin-bottom: 2.5rem;
}

/* 特色功能区域 */
.features {
    padding: 6rem 0;
    background: var(--bg-light);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 4rem;
    color: var(--text-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 20px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--secondary-medium);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(198, 51, 35, 0.1);
    border-color: var(--primary-color);
}

/* 下载区域样式 */
.download {
    background: var(--bg-gray);
    padding: 6rem 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
}

.download-buttons {
    display: flex;
    gap: 2rem;
    margin-top: 2rem;
}

.qr-code {
    text-align: center;
}

.qr-code img {
    width: 150px;
    height: 150px;
    margin-bottom: 1rem;
}

/* 底部样式 */
.footer {
    background: #2c2c2c;
    color: white;
    padding: 4rem 0 2rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4rem;
    margin-bottom: 3rem;
}

.footer-section h3 {
    color: white;
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
}

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

.footer-section ul li {
    margin-bottom: 0.8rem;
}

.footer-section a {
    color: #999;
    text-decoration: none;
    transition: color 0.3s;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #999;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero {
        flex-direction: column;
        text-align: center;
    }

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

    .download {
        flex-direction: column;
        text-align: center;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}