/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Arial', sans-serif;
    background-color: #fafafa;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* 双栏布局 */
.layout {
    display: flex;
    gap: 30px;
    margin-top: 20px;
}

.controls, .preview {
    flex: 1;
    min-height: 600px;
}

/* 标题样式 */
h1 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
    font-size: 2em;
    font-weight: 300;
    letter-spacing: -0.5px;
}

/* 控制面板样式 */
.controls {
    background-color: #fff;
    border-radius: 4px;
    padding: 25px;
    margin-bottom: 30px;
    border: 1px solid #eee;
}

.control-group {
    margin-bottom: 25px;
}

.control-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* 文本输入区域 */
#text-input {
    width: 100%;
    height: 140px;
    padding: 15px;
    border: 1px solid #eee;
    border-radius: 4px;
    font-size: 16px;
    resize: vertical;
    font-family: inherit;
    background-color: #fafafa;
    transition: all 0.2s ease;
}

#text-input:focus {
    outline: none;
    border-color: #999;
    background-color: #fff;
}

/* 数字输入框样式 */
input[type="number"] {
    width: 60px;
    height: 35px;
    padding: 8px 12px;
    border: 1px solid #eee;
    border-radius: 4px;
    font-size: 14px;
    margin: 0 8px;
    background-color: #fafafa;
    transition: all 0.2s ease;
    vertical-align: middle;
}

input[type="number"]:focus {
    outline: none;
    border-color: #999;
    background-color: #fff;
}

input[type="range"]::-moz-range-thumb:hover {
    background: #333;
    transform: scale(1.1);
}

/* 颜色选择器 */
input[type="color"] {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    vertical-align: middle;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

/* 署名输入框 */
#signature {
    width: 100%;
    height: 45px;
    padding: 10px 15px;
    border: 1px solid #eee;
    border-radius: 4px;
    font-size: 16px;
    font-family: inherit;
    background-color: #fafafa;
    transition: all 0.3s ease;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05);
    vertical-align: middle;
}

#signature:focus {
    outline: none;
    border-color: #333;
    background-color: #fff;
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.05), inset 0 1px 3px rgba(0, 0, 0, 0.05);
    transform: translateY(-1px);
}

#signature::placeholder {
    color: #aaa;
    font-style: italic;
}

/* 按钮样式 */
.buttons {
    display: flex;
    gap: 15px;
    margin-top: 35px;
}

button {
    padding: 12px 24px;
    border: none;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

#generate-btn {
    background-color: #333;
    color: #fff;
    flex: 1;
}

#generate-btn:hover {
    background-color: #000;
    transform: translateY(-1px);
}

#download-btn {
    background-color: #666;
    color: #fff;
    flex: 1;
}

#download-btn:hover {
    background-color: #333;
    transform: translateY(-1px);
}

#download-btn:disabled {
    background-color: #ccc;
    cursor: not-allowed;
    transform: none;
}

/* 预览区域 */
.preview {
    background-color: #fff;
    border-radius: 4px;
    padding: 25px;
    border: 1px solid #eee;
}

.preview h2 {
    margin-bottom: 20px;
    color: #333;
    font-size: 1.2em;
    font-weight: 300;
    text-transform: uppercase;
    letter-spacing: 1px;
}

#preview-container {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    background-color: #fafafa;
    border-radius: 4px;
    overflow: auto;
}

#canvas {
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
    background-color: #fff;
    border: 1px solid #eee;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .layout {
        flex-direction: column;
    }
    
    .controls, .preview {
        min-height: auto;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    h1 {
        font-size: 1.8em;
    }
    
    .buttons {
        flex-direction: column;
    }
    
    button {
        width: 100%;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.5em;
    }
    
    #text-input {
        height: 120px;
    }
    
    .controls {
        padding: 20px;
    }
    
    .preview {
        padding: 20px;
    }
}