/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Arial', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

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

/* 导航栏样式 */
.navbar {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo h2 {
    color: #2563eb;
    font-size: 1.8rem;
    font-weight: bold;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-menu a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: #2563eb;
}

.nav-buttons {
    display: flex;
    gap: 15px;
    align-items: center;
}

.btn-login {
    padding: 8px 20px;
    color: #2563eb;
    text-decoration: none;
    border: 1px solid #2563eb;
    border-radius: 5px;
    transition: all 0.3s;
}

.btn-login:hover {
    background: #2563eb;
    color: white;
}

.btn-primary {
    background: #2563eb;
    color: white;
    padding: 10px 25px;
    border: none;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 500;
    transition: background 0.3s;
}

.btn-primary:hover {
    background: #1d4ed8;
}

.btn-secondary {
    background: transparent;
    color: #2563eb;
    padding: 10px 25px;
    border: 1px solid #2563eb;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
}

.btn-secondary:hover {
    background: #2563eb;
    color: white;
}

.btn-large {
    padding: 12px 30px;
    font-size: 1.1rem;
}

/* 首页横幅 */
.hero {
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    color: white;
    padding: 150px 0 100px;
    text-align: center;
    margin-top: 70px;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    font-weight: bold;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

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

/* 数据统计 */
.stats {
    padding: 80px 0;
    background: #f8fafc;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    text-align: center;
}

.stat-item h3 {
    font-size: 3rem;
    color: #2563eb;
    font-weight: bold;
    margin-bottom: 10px;
}

.stat-item p {
    color: #64748b;
    font-size: 1.1rem;
}

/* 功能特性 */
.features {
    padding: 100px 0;
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
    color: #1e293b;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.feature-card {
    text-align: center;
    padding: 40px 20px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #1e293b;
}

.feature-card p {
    color: #64748b;
    line-height: 1.6;
}

/* 应用场景 */
.scenarios {
    padding: 100px 0;
    background: #f8fafc;
}

.scenarios h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
    color: #1e293b;
}

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

.scenario-card {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    text-align: center;
}

.scenario-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: #2563eb;
}

/* 用户评价 */
.testimonials {
    padding: 100px 0;
}

.testimonials h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
    color: #1e293b;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 40px;
}

.testimonial-card {
    background: #f8fafc;
    padding: 30px;
    border-radius: 10px;
    border-left: 4px solid #2563eb;
}

.testimonial-card p {
    font-style: italic;
    margin-bottom: 20px;
    line-height: 1.6;
}

.author strong {
    color: #1e293b;
    display: block;
}

.author span {
    color: #64748b;
    font-size: 0.9rem;
}

/* 行动号召 */
.cta {
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
}

.cta h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.cta p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

/* 页脚 */
.footer {
    background: #1e293b;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 20px;
}

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

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

.footer-section a {
    color: #cbd5e1;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #374151;
    color: #9ca3af;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        height: auto;
        padding: 15px 20px;
    }

    .nav-menu {
        margin: 20px 0;
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero {
        padding: 120px 0 60px;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

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

    .cta h2 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-content h1 {
        font-size: 1.8rem;
    }
    
    .container {
        padding: 0 15px;
    }
}