/* 基礎樣式 */
body {
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
    background-color: #f4f4f4;
}

h1 {
    color: #333;
}

/* 控制區域樣式 */
.controls {
    margin-bottom: 20px;
    padding: 15px;
    border: 1px solid #ccc;
    border-radius: 8px;
    background-color: #fff;
    display: flex;
    flex-wrap: wrap; 
    gap: 15px;
    align-items: flex-start; /* 讓組別頂端對齊 */
    justify-content: center;
}

.control-group {
    padding: 10px;
    border: 1px dashed #ccc;
    border-radius: 5px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.group-title {
    margin: 0;
    font-weight: bold;
    color: #007bff;
    border-bottom: 1px solid #e0e0e0;
    padding-bottom: 5px;
    margin-bottom: 5px;
}

/* 畫布容器樣式 */
.canvas-container {
    margin-top: 20px;
    border: 2px solid #333; 
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    background-color: #fff;
    max-width: 100%;
    overflow: auto;
}

/* 基礎按鈕樣式 */
#image-upload { display: none; }

.action-button, .custom-file-upload, .preset-color-button {
    border: 1px solid #ccc;
    display: inline-block;
    padding: 8px 15px;
    cursor: pointer;
    background-color: #007bff;
    color: white;
    border-radius: 4px;
    font-weight: bold;
    transition: background-color 0.3s, opacity 0.3s;
    text-align: center;
}

.action-button:hover:not(:disabled), .custom-file-upload:hover:not(:disabled) {
    background-color: #0056b3;
}

.action-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: #ccc;
}

/* 預設顏色按鈕樣式 */
.preset-color-button {
    border: none;
    color: white;
}

.preset-color-button:hover:not(:disabled) { opacity: 0.8; }

#blue-button { background-color: #1e88e5; }
#green-button { background-color: #43a047; }
#red-button { background-color: #e53935; }
#yellow-button { background-color: #ffb300; color: #333;}
#gray-button { background-color: #9e9e9e; }
#white-button { background-color: #ffffff; color: #333; border: 1px solid #333;}

/* 反轉紋路按鈕樣式 */
#invert-luminosity-button { background-color: #6a1b9a; }

/* 自訂顏色選擇器樣式 */
.color-picker-group {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 5px;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    background-color: #f9f9f9;
}

#custom-color-picker {
    width: 40px;
    height: 30px;
    padding: 0;
    border: none;
    cursor: pointer;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background: none;
}
#custom-color-button { background-color: #ff00ff; }