/* 品牌色板 */
:root {
    --primary: #07c160; /* 微信绿 */
    --primary-dark: #06ad56;
    --secondary: #f2f2f2;
    --secondary-light: #f8f9fa;
    --text-primary: #333;
    --text-secondary: #666;
    --text-muted: #999;
    --border-color: #e5e5e5;
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --hover-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    --radius: 12px;
    --radius-lg: 20px;
    --transition: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-primary);
    background-color: var(--secondary-light);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: box-shadow var(--transition);
}

.navbar.scrolled {
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

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

.logo-icon {
    width: 32px;
    height: 32px;
    margin-right: 8px;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 15px;
    transition: color var(--transition);
}

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

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-primary);
    cursor: pointer;
    padding: 5px;
}

/* Hero 区域 */
.hero {
    padding: 140px 0 80px;
    background: linear-gradient(135deg, #f0faf5 0%, #e8f5e9 100%);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(7, 193, 96, 0.1) 0%, transparent 70%);
    animation: pulse 6s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.hero-logo {
    width: 180px;
    height: auto;
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 42px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 30px;
    position: relative;
    z-index: 1;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all var(--transition);
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(7, 193, 96, 0.4);
}

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

.btn-secondary:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-2px);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin-top: 50px;
    position: relative;
    z-index: 1;
}

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

.stat-number {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary);
    display: block;
}

.stat-label {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 4px;
}

/* 板块标题 */
.section-title {
    font-size: 32px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 16px;
    color: var(--text-muted);
    text-align: center;
    margin-bottom: 40px;
}

/* 功能介绍 */
.features {
    padding: 80px 0;
    background: #fff;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--secondary-light);
    border-radius: var(--radius);
    padding: 30px;
    text-align: center;
    transition: all var(--transition);
    border: 1px solid var(--border-color);
}

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

.feature-card i {
    font-size: 40px;
    color: var(--primary);
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* 下载中心 */
.download {
    padding: 80px 0;
    background: linear-gradient(135deg, #f0faf5 0%, #fff 100%);
}

.download-options {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.download-card {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 40px 30px;
    width: 280px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: all var(--transition);
}

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

.download-card i {
    font-size: 48px;
    color: var(--primary);
    margin-bottom: 16px;
}

.download-card h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 8px;
}

.download-card p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.download-card .btn {
    width: 100%;
    justify-content: center;
}

/* 关于我们 */
.about {
    padding: 80px 0;
    background: #fff;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
}

.about-text p {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.about-mission h3 {
    font-size: 22px;
    font-weight: 600;
    color: var(--primary);
    margin-top: 20px;
    margin-bottom: 8px;
}

.about-mission p {
    font-size: 15px;
    color: var(--text-secondary);
}

/* 联系我们 */
.contact {
    padding: 80px 0;
    background: var(--secondary-light);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-form input,
.contact-form textarea {
    padding: 14px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 15px;
    transition: border-color var(--transition);
    font-family: inherit;
}

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

.contact-form button {
    align-self: flex-start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 20px 0;
}

.contact-info p {
    font-size: 16px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 12px;
}

.contact-info i {
    color: var(--primary);
    width: 20px;
    text-align: center;
}

.social-links {
    display: flex;
    gap: 20px;
    margin-top: 10px;
}

.social-links a {
    font-size: 28px;
    color: var(--text-muted);
    transition: color var(--transition), transform var(--transition);
}

.social-links a:hover {
    color: var(--primary);
    transform: scale(1.1);
}

/* 页脚 */
.footer {
    background: #1a1a2e;
    color: #ccc;
    padding: 60px 0 20px;
}

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

.footer-brand .footer-logo {
    width: 160px;
    height: auto;
    margin-bottom: 10px;
}

.footer-brand p {
    font-size: 14px;
    color: #999;
}

.footer-links h4,
.footer-contact h4 {
    font-size: 18px;
    color: #fff;
    margin-bottom: 16px;
}

.footer-links a {
    display: block;
    color: #999;
    text-decoration: none;
    margin-bottom: 8px;
    transition: color var(--transition);
}

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

.footer-contact p {
    font-size: 14px;
    color: #999;
    margin-bottom: 8px;
}

.footer-bottom {
    border-top: 1px solid #333;
    padding-top: 20px;
    text-align: center;
    font-size: 14px;
    color: #666;
}

.footer-bottom a {
    color: #999;
    text-decoration: none;
}

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

/* 响应式 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background: #fff;
        padding: 20px;
        box-shadow: 0 4px 10px rgba(0,0,0,0.1);
        gap: 15px;
    }

    .nav-links.active {
        display: flex;
    }

    .menu-toggle {
        display: block;
    }

    .hero h1 {
        font-size: 28px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .hero-stats {
        gap: 30px;
    }

    .stat-number {
        font-size: 24px;
    }

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

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 100px 0 60px;
    }

    .hero-logo {
        width: 140px;
    }

    .hero h1 {
        font-size: 24px;
    }

    .hero-stats {
        flex-direction: column;
        gap: 15px;
    }

    .download-card {
        width: 100%;
        max-width: 320px;
    }
}
```

```javascript