* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

body {
    background-color: #f8f9fa;
    color: #333;
    line-height: 1.6;
}

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

/* 头部样式 */
header {
    background: linear-gradient(135deg, #1e3a8a 0%, #0c4a6e 100%);
    color: white;
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.logo {
    display: flex;
    align-items: center;
}

.logo h1 {
    font-size: 24px;
    font-weight: 700;
    margin-left: 10px;
}

.logo span {
    color: #f0b90b;
}

nav ul {
    display: flex;
    list-style: none;
}

nav li {
    margin-left: 30px;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    font-size: 16px;
}

nav a:hover {
    color: #f0b90b;
}

/* Hero区域 */
.hero {
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="1200" height="500" viewBox="0 0 1200 500"><rect fill="%230c4a6e" width="1200" height="500"/><circle fill="%231e3a8a" cx="800" cy="100" r="120"/><circle fill="%231e3a8a" cx="1000" cy="300" r="80"/></svg>') no-repeat center/cover;
    color: white;
    padding: 80px 0;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h2 {
    font-size: 42px;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero p {
    font-size: 20px;
    margin-bottom: 30px;
    opacity: 0.9;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 15px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 18px;
    transition: all 0.3s ease;
    min-width: 220px;
    text-align: center;
}

.btn-primary {
    background: #f0b90b;
    color: #1e293b;
}

.btn-primary:hover {
    background: #e0aa00;
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(240, 185, 11, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-3px);
}

/* 特性部分 */
.features {
    padding: 80px 0;
    background-color: white;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 36px;
    color: #1e293b;
    margin-bottom: 15px;
}

.section-title p {
    color: #64748b;
    max-width: 700px;
    margin: 0 auto;
}

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

.feature-card {
    background: #f8fafc;
    border-radius: 15px;
    padding: 30px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid #e2e8f0;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.08);
}

.feature-icon {
    font-size: 48px;
    color: #0ea5e9;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: #1e293b;
}

/* 下载引导 */
.download-section {
    padding: 80px 0;
    background: linear-gradient(to right, #f0f9ff, #e0f2fe);
}

.download-container {
    display: flex;
    align-items: center;
    gap: 50px;
}

.download-content {
    flex: 1;
}

.download-image {
    flex: 1;
    text-align: center;
}

.download-content h2 {
    font-size: 36px;
    color: #1e293b;
    margin-bottom: 20px;
}

.download-content p {
    color: #475569;
    margin-bottom: 30px;
    font-size: 18px;
}

.download-steps {
    display: flex;
    gap: 20px;
    margin-top: 30px;
}

.step {
    flex: 1;
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

.step-number {
    display: inline-block;
    background: #0ea5e9;
    color: white;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    text-align: center;
    line-height: 32px;
    margin-bottom: 15px;
}

.step h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: #1e293b;
}

/* FAQ部分 */
.faq {
    padding: 80px 0;
    background-color: white;
}

.faq-item {
    margin-bottom: 20px;
    border: 1px solid #e2e8f0;
    border-radius: 10px;
    overflow: hidden;
    max-width: 800px;
    margin: 0 auto 20px;
}

.faq-question {
    padding: 20px;
    background: #f8fafc;
    font-weight: 600;
    font-size: 18px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-answer p {
    padding: 20px 0;
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 0 20px;
}

/* 底部 */
footer {
    background: #0f172a;
    color: #cbd5e1;
    padding: 60px 0 20px;
}

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

.footer-column h3 {
    color: white;
    margin-bottom: 20px;
    font-size: 20px;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: #94a3b8;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: #f0b90b;
}

.copyright {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #1e293b;
    color: #94a3b8;
    font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
    }
    
    nav ul {
        margin-top: 15px;
    }
    
    nav li {
        margin-left: 15px;
        margin-right: 15px;
    }
    
    .hero h2 {
        font-size: 32px;
    }
    
    .download-container {
        flex-direction: column;
    }
    
    .download-steps {
        flex-direction: column;
    }
    
    .section-title h2 {
        font-size: 28px;
    }
}