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

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

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

header {
    text-align: center;
    margin-bottom: 40px;
    color: white;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

main {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

.upload-section {
    margin-bottom: 40px;
}

.upload-area {
    border: 3px dashed #667eea;
    border-radius: 15px;
    padding: 60px 20px;
    text-align: center;
    transition: all 0.3s ease;
    background: linear-gradient(135deg, #f8f9ff 0%, #e8f2ff 100%);
    cursor: pointer;
}

.upload-area:hover {
    border-color: #764ba2;
    background: linear-gradient(135deg, #f0f4ff 0%, #e0edff 100%);
    transform: translateY(-2px);
}

.upload-area.dragover {
    border-color: #764ba2;
    background: linear-gradient(135deg, #e8f2ff 0%, #d0e8ff 100%);
    transform: scale(1.02);
}

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

.upload-content h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: #333;
}

.upload-content p {
    color: #666;
    margin-bottom: 5px;
}

.file-limit {
    font-size: 0.9rem;
    color: #999;
    margin-bottom: 20px;
}

.upload-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 25px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.upload-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.upload-progress {
    margin-top: 20px;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: #e0e0e0;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    width: 0%;
    transition: width 0.3s ease;
}

#progressText {
    text-align: center;
    color: #666;
    font-size: 0.9rem;
}

.result-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-top: 40px;
}

.file-info, .qr-section, .mobile-preview {
    background: #f8f9fa;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

.file-info h3, .qr-section h3, .mobile-preview h3 {
    margin-bottom: 20px;
    color: #333;
    font-size: 1.2rem;
}

.info-grid {
    display: grid;
    gap: 15px;
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid #e0e0e0;
}

.info-item:last-child {
    border-bottom: none;
}

.label {
    font-weight: 600;
    color: #555;
}

.value {
    color: #333;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.qr-container {
    text-align: center;
    margin-bottom: 20px;
}

.qr-image {
    max-width: 200px;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.qr-actions {
    display: flex;
    gap: 10px;
    justify-content: center;
}

.download-btn, .share-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.download-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.share-btn {
    background: #f8f9fa;
    color: #333;
    border: 2px solid #667eea;
}

.download-btn:hover, .share-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.mobile-frame {
    width: 200px;
    height: 350px;
    margin: 0 auto;
    background: #333;
    border-radius: 20px;
    padding: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.mobile-screen {
    width: 100%;
    height: 100%;
    background: white;
    border-radius: 15px;
    overflow: hidden;
}

.mobile-header {
    background: #333;
    color: white;
    padding: 5px 15px;
    font-size: 0.8rem;
}

.mobile-status-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.mobile-icons {
    display: flex;
    gap: 5px;
}

.mobile-content {
    padding: 20px;
    text-align: center;
}

.mobile-download-page h4 {
    margin-bottom: 15px;
    color: #333;
}

.mobile-download-page p {
    margin-bottom: 10px;
    color: #666;
    font-size: 0.9rem;
}

.mobile-download-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 20px;
    font-size: 0.9rem;
    cursor: pointer;
    margin-top: 15px;
}

footer {
    text-align: center;
    color: white;
    opacity: 0.8;
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    main {
        padding: 20px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .result-section {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .qr-actions {
        flex-direction: column;
    }
    
    .mobile-frame {
        width: 150px;
        height: 250px;
    }
}

@media (max-width: 480px) {
    .upload-area {
        padding: 40px 15px;
    }
    
    .upload-icon {
        font-size: 3rem;
    }
    
    .upload-content h3 {
        font-size: 1.2rem;
    }
}