* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

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

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

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

main {
    padding: 40px;
}

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

.upload-area {
    border: 3px dashed #ddd;
    border-radius: 15px;
    padding: 60px 20px;
    text-align: center;
    background: #fafafa;
    transition: all 0.3s ease;
    cursor: pointer;
}

.upload-area:hover {
    border-color: #667eea;
    background: #f5f3ff;
}

.upload-area.dragover {
    border-color: #667eea;
    background: #f5f3ff;
    transform: scale(1.02);
}

.upload-content {
    max-width: 400px;
    margin: 0 auto;
}

.upload-icon {
    color: #667eea;
    margin-bottom: 20px;
}

.upload-content h3 {
    color: #333;
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.upload-content p {
    color: #666;
    margin-bottom: 20px;
}

.upload-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 1rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.upload-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

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

.process-section {
    animation: fadeIn 0.5s ease;
}

.image-container {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 30px;
    align-items: start;
}

.image-preview {
    background: #f8f9fa;
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
}

.image-preview h3 {
    color: #333;
    font-size: 1.2rem;
    margin-bottom: 15px;
    text-align: center;
    font-weight: 600;
}

.image-preview img {
    width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 20px;
    justify-content: center;
    align-items: center;
    min-width: 200px;
}

.control-group {
    width: 100%;
}

.control-group label {
    display: block;
    margin-bottom: 8px;
    color: #333;
    font-weight: 600;
}

.control-group select {
    width: 100%;
    padding: 10px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    background: white;
    cursor: pointer;
    transition: border-color 0.3s ease;
}

.control-group select:focus {
    outline: none;
    border-color: #667eea;
}

.process-btn, .save-btn {
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    color: white;
    border: none;
    padding: 15px 25px;
    font-size: 1rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(40, 167, 69, 0.3);
    display: flex;
    align-items: center;
    gap: 8px;
}

.process-btn:hover, .save-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(40, 167, 69, 0.4);
}

.process-btn.active {
    background: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.3);
}

.process-btn.active:hover {
    box-shadow: 0 8px 25px rgba(0, 123, 255, 0.4);
}

.save-btn {
    background: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.3);
}

.save-btn:hover {
    box-shadow: 0 8px 25px rgba(0, 123, 255, 0.4);
}

.btn-icon {
    font-size: 1.2rem;
}

.loading {
    text-align: center;
    padding: 40px 20px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

.loading p {
    color: #666;
    font-size: 1rem;
}

.toast {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: #333;
    color: white;
    padding: 15px 25px;
    border-radius: 50px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
    z-index: 1000;
    max-width: 300px;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

.toast.success {
    background: #28a745;
}

.toast.error {
    background: #dc3545;
}

.toast.info {
    background: #17a2b8;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        margin: 10px;
        border-radius: 15px;
    }
    
    header {
        padding: 30px 20px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    main {
        padding: 30px 20px;
    }
    
    .image-container {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .controls {
        min-width: auto;
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .control-group {
        flex: 1;
        min-width: 200px;
    }
    
    .upload-area {
        padding: 40px 20px;
    }
    
    .toast {
        bottom: 20px;
        right: 20px;
        left: 20px;
        max-width: none;
    }
}