:root {
    --primary-color: #4CAF50;
    --primary-hover: #45a049;
    --secondary-color: #2196F3;
    --secondary-hover: #0b7dda;
    --bg-color: #f5f5f5;
    --card-bg: #ffffff;
    --text-color: #333;
    --border-color: #ddd;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

header {
    text-align: center;
    margin-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
}

h1 {
    margin: 0 0 10px 0;
    color: #2c3e50;
}

p {
    margin: 0;
    color: #666;
}

.controls-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 30px;
}

/* File Upload */
.file-upload {
    display: flex;
    align-items: center;
    gap: 15px;
}

input[type="file"] {
    display: none;
}

.custom-file-upload {
    border: 1px solid #ccc;
    display: inline-block;
    padding: 8px 16px;
    cursor: pointer;
    background-color: #f8f9fa;
    border-radius: 4px;
    transition: all 0.3s;
}

.custom-file-upload:hover {
    background-color: #e2e6ea;
}

#fileName {
    color: #666;
    font-size: 0.9em;
}

/* Settings Grid */
.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 15px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.input-group label {
    font-size: 0.9em;
    font-weight: 500;
}

.input-group input[type="number"],
.input-group input[type="text"] {
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.input-group input[type="color"] {
    width: 100%;
    height: 40px;
    padding: 2px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
}

/* Text Input */
textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    resize: vertical;
    font-family: inherit;
    box-sizing: border-box;
}

/* Buttons */
.action-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
}

button {
    padding: 10px 25px;
    border: none;
    border-radius: 5px;
    font-size: 1em;
    cursor: pointer;
    transition: background-color 0.3s;
    color: white;
}

.primary-btn {
    background-color: var(--primary-color);
}

.primary-btn:hover {
    background-color: var(--primary-hover);
}

.secondary-btn {
    background-color: var(--secondary-color);
}

.secondary-btn:hover {
    background-color: var(--secondary-hover);
}

button:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
}

/* Preview Section */
.preview-section {
    text-align: center;
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
}

#previewContainer {
    margin-top: 20px;
    min-height: 200px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #f9f9f9;
    border: 2px dashed #e0e0e0;
    border-radius: 8px;
    padding: 10px;
    overflow: auto;
}

#previewImage {
    max-width: 100%;
    height: auto;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    display: block;
}

@media (max-width: 600px) {
    .settings-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    button {
        width: 100%;
    }
}