* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 60px 40px;
    text-align: center;
}

header h1 {
    font-size: 3rem;
    margin-bottom: 15px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.subtitle {
    font-size: 1.3rem;
    opacity: 0.95;
}

main {
    padding: 60px 40px;
}

.feature-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.feature-card {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    padding: 40px 30px;
    border-radius: 15px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.feature-card h2 {
    font-size: 1.8rem;
    margin-bottom: 15px;
    color: #667eea;
}

.feature-card p {
    font-size: 1.1rem;
    line-height: 1.6;
    color: #555;
}

.info-section {
    background: #f8f9fa;
    padding: 40px;
    border-radius: 15px;
    margin-bottom: 40px;
}

.info-section h2 {
    font-size: 2rem;
    margin-bottom: 30px;
    color: #667eea;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.info-item {
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.info-item strong {
    display: block;
    color: #667eea;
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.info-item span {
    font-size: 1.1rem;
    color: #333;
}

.workflow-section {
    margin-top: 40px;
}

.workflow-section h2 {
    font-size: 2rem;
    margin-bottom: 30px;
    color: #667eea;
    text-align: center;
}

.workflow {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
}

.step {
    display: flex;
    align-items: center;
    gap: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 25px;
    border-radius: 15px;
    flex: 1;
    min-width: 200px;
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.step-number {
    background: white;
    color: #667eea;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 1.2rem;
    margin-bottom: 5px;
}

.step-content p {
    font-size: 0.9rem;
    opacity: 0.9;
}

.arrow {
    font-size: 2rem;
    color: #667eea;
    font-weight: bold;
}

footer {
    background: #f8f9fa;
    padding: 30px;
    text-align: center;
    color: #666;
    border-top: 1px solid #e9ecef;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    main {
        padding: 30px 20px;
    }

    .workflow {
        flex-direction: column;
    }

    .arrow {
        transform: rotate(90deg);
    }
}