:root {
    --primary-color: #4CAF50;
    --primary-hover: #45a049;
    --text-color: #333;
    --bg-color: #f5f5f5;
    --card-bg: #fff;
    --border-color: #ddd;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
}

.container {
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    max-width: 800px;
    width: 100%;
}

h1 {
    margin-top: 0;
    margin-bottom: 20px;
    font-size: 24px;
}

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

/* File Upload */
.file-upload {
    display: flex;
    align-items: center;
    gap: 10px;
}

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

.custom-file-upload {
    border: 1px solid #ccc;
    display: inline-block;
    padding: 6px 12px;
    cursor: pointer;
    background-color: #f0f0f0;
    border-radius: 4px;
    font-size: 14px;
}

.custom-file-upload:hover {
    background-color: #e0e0e0;
}

/* Config Row */
.config-row {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    align-items: center;
}

.input-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.input-group label {
    font-size: 14px;
    font-weight: 500;
}

.input-group input[type="number"] {
    width: 60px;
    padding: 5px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.input-group input[type="color"] {
    width: 40px;
    height: 30px;
    padding: 0;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
}

/* Textarea */
textarea {
    width: 100%;
    height: 150px;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    resize: vertical;
    font-family: inherit;
    box-sizing: border-box;
}

/* Buttons */
.button-row {
    display: flex;
    gap: 15px;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: background-color 0.2s;
}

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

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

.btn:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

/* Preview */
.preview-area {
    width: 100%;
    min-height: 200px;
    border: 1px dashed var(--border-color);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 20px;
    box-sizing: border-box;
    background-color: #fafafa;
    overflow-x: auto;
}

canvas {
    max-width: 100%;
    height: auto;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.hidden {
    display: none;
}