/* 颜色变量 - 为不支持 CSS 变量的浏览器提供降级颜色 */
:root {
    --primary-color: #3498db;
    --primary-hover: #2980b9;
    --text-color: #2c3e50;
    --text-content: #1a1a1a;
    --bg-color: #f9f9f9;
    --container-bg: #ffffff;
    --border-color: #e0e0e0;
    --success-color: #2ecc71;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

/* Reset 和基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif; /* 使用广泛兼容的字体 */
    line-height: 1.6;
    color: #2c3e50; /* 颜色降级支持 */
    background: #f9f9f9;
    min-height: 100vh;
    padding: 20px;
}

/* 容器样式 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    background: #ffffff;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1); /* 盒子阴影 */
    border: 1px solid #e0e0e0; /* 边框作为旧浏览器的备用 */
}

/* 标题样式 */
h1 {
    color: #2c3e50;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

p {
    color: #666;
    margin-bottom: 2rem;
}

/* 表单样式 */
#pasteForm {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

textarea {
    width: 100%;
    min-height: 400px;
    padding: 1rem;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-family: 'Courier New', monospace; /* 兼容性更强的字体 */
    font-size: 1rem;
    line-height: 1.5;
    color: #1a1a1a;
    font-weight: 500;
    resize: vertical;
}

textarea:focus {
    outline: none;
    border-color: #3498db;
}

/* 网格布局降级为 Flexbox */
.options {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin: 1rem 0;
}

.option {
    width: 100%;
    max-width: 250px;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* 表单控件样式 */
label {
    font-weight: 500;
    color: #2c3e50;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

select, input[type="number"] {
    padding: 0.75rem;
    border: 2px solid #e0e0e0;
    border-radius: 6px;
    font-size: 1rem;
    width: 100%;
    background: white;
}

input[type="checkbox"] {
    width: 1.2rem;
    height: 1.2rem;
    border-radius: 4px;
}

/* 按钮样式 */
button {
    background: #3498db;
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    max-width: 200px;
}

button:hover {
    background: #2980b9;
}

/* 内容显示 */
#content {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    border: 2px solid #e0e0e0;
    margin-top: 1rem;
    overflow-x: auto;
    color: #1a1a1a;
    font-weight: 500;
}

pre {
    font-family: 'Courier New', monospace;
    white-space: pre-wrap;
    word-wrap: break-word;
    color: #1a1a1a;
    font-weight: 500;
}

/* 信息区域 */
.info {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 6px;
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* 解密区块 */
#decrypt-section {
    background: #fff3cd;
    color: #856404;
    padding: 1rem;
    border-radius: 6px;
    margin: 1rem 0;
}

#decryption-error {
    background: #f8d7da;
    color: #721c24;
    padding: 1rem;
    border-radius: 6px;
    margin-top: 1rem;
}

/* 响应式设计 */
@media screen and (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    .container {
        padding: 1rem;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    textarea {
        min-height: 300px;
    }
    
    .options {
        flex-direction: column;
    }
    
    button {
        max-width: 100%;
    }
    
    #content {
        padding: 1rem;
    }
}

/* 深色模式 */
@media (prefers-color-scheme: dark) {
    body {
        background: #1a1a1a;
        color: #e0e0e0;
    }
    
    .container {
        background: #2d2d2d;
        border: 1px solid #404040;
    }
    
    textarea, select, input[type="number"] {
        background: #333;
        color: #e0e0e0;
    }
    
    #content {
        background: #333;
    }
    
    #decrypt-section {
        background: #2c2c1d;
        color: #ffd700;
    }
    
    #decryption-error {
        background: #2c1d1d;
        color: #ff7070;
    }
    
    .info {
        background: #333;
        color: #999;
    }
    
    textarea, #content, pre {
        color: #ffffff;
    }
}