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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #374151;
    background-color: #f9fafb;
    min-height: 100vh;
}

.container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    max-width: 1200px;
    margin: 0 auto;
}

/* Header Styles */
.header {
    text-align: center;
    padding: 60px 20px 40px;
    background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
    color: white;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 300;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 60px 20px 40px;
    background: white;
}

/* QR Code Section */
.qr-section {
    text-align: center;
    margin-bottom: 60px;
}

.qr-section h2 {
    font-size: 1.8rem;
    color: #1e40af;
    margin-bottom: 30px;
    font-weight: 600;
}

.qr-container {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}

.qr-code {
    width: 250px;
    height: 250px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    border: 3px solid #e5e7eb;
}

.qr-tip {
    font-size: 1rem;
    color: #6b7280;
    margin-top: 15px;
}

/* Features Section */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.feature-item {
    text-align: center;
    padding: 30px 20px;
    background: #f8fafc;
    border-radius: 12px;
    border: 1px solid #e2e8f0;
    transition: transform 0.2s, box-shadow 0.2s;
}

.feature-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(30, 64, 175, 0.1);
}

.feature-item h3 {
    font-size: 1.2rem;
    color: #1e40af;
    margin-bottom: 12px;
    font-weight: 600;
}

.feature-item p {
    color: #6b7280;
    font-size: 0.95rem;
}

/* Footer */
.footer {
    background-color: #1f2937;
    color: #9ca3af;
    padding: 30px 20px;
    text-align: center;
}

.beian-info p {
    margin-bottom: 8px;
}

.beian-info a {
    color: #9ca3af;
    text-decoration: none;
    transition: color 0.2s;
}

.beian-info a:hover {
    color: #d1d5db;
}

.separator {
    margin: 0 10px;
}

.copyright {
    font-size: 0.9rem;
    margin-top: 10px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .qr-code {
        width: 200px;
        height: 200px;
    }
    
    .features {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .feature-item {
        padding: 25px 15px;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 40px 15px 30px;
    }
    
    .header h1 {
        font-size: 1.8rem;
    }
    
    .main-content {
        padding: 40px 15px 30px;
    }
    
    .qr-section h2 {
        font-size: 1.5rem;
    }
    
    .qr-code {
        width: 180px;
        height: 180px;
    }
}