:root {
    --primary-color: #4CAF50;
    --primary-hover: #45a049;
    --bg-color: #f5f5f5;
    --card-bg: #ffffff;
    --text-color: #333;
    --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;
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

header h1 {
    margin-top: 0;
    margin-bottom: 25px;
    font-size: 24px;
    font-weight: bold;
}

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

.control-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* File Input */
.file-group {
    align-items: center;
}

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

.file-label {
    background-color: #e0e0e0;
    padding: 8px 15px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    border: 1px solid #ccc;
    transition: background 0.2s;
}

.file-label:hover {
    background-color: #d0d0d0;
}

#fileName {
    color: #666;
    font-size: 14px;
    margin-left: 10px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 300px;
}

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

.setting-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.setting-item label {
    font-size: 14px;
    font-weight: 500;
}

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

.color-wrapper {
    width: 30px;
    height: 30px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 2px;
    background: #fff;
}

.setting-item input[type="color"] {
    width: 200%;
    height: 200%;
    transform: translate(-25%, -25%);
    cursor: pointer;
    border: none;
    padding: 0;
}

/* 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-group {
    display: flex;
    gap: 15px;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
    color: white;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

.btn.primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
}

.btn.success {
    background-color: #2196F3;
}

.btn.success:hover:not(:disabled) {
    background-color: #1976D2;
}

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

#canvasContainer {
    min-height: 200px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #fafafa;
    border: 1px dashed #ccc;
    border-radius: 4px;
    overflow: auto;
}

canvas {
    max-width: 100%;
    height: auto;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    display: none; /* Hidden by default until generated */
}

.placeholder-text {
    color: #999;
}