:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --light-bg: #f8f9fa;
    --dark-bg: #2c3e50;
    --text-color: #333;
    --border-color: #e0e0e0;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

* {
    margin: 5px;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
    line-height: 1.6;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.header {
    text-align: center;
    margin-bottom: 30px;
    color: white;
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

.main-content {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

.container {
    display: flex;
    gap: 30px;
    margin-bottom: 40px;
}

.editor, .preview {
    flex: 1;
    border: 2px solid var(--border-color);
    padding: 25px;
    border-radius: 10px;
    background: white;
    transition: all 0.3s ease;
}

.editor:hover, .preview:hover {
    border-color: var(--secondary-color);
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.2);
}

.editor h3, .preview h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.3rem;
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 10px;
}

textarea {
    width: 100%;
    height: 400px;
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    resize: vertical;
    transition: all 0.3s ease;
    background: #fafafa;
}

textarea:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
    background: white;
}

.toolbar {
    margin-top: 20px;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

button {
    padding: 12px 24px;
    background: linear-gradient(135deg, var(--secondary-color), #2980b9);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

button:active {
    transform: translateY(0);
}

#htmlPreview {
    min-height: 400px;
    padding: 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: #fafafa;
    overflow-y: auto;
}

#htmlPreview::-webkit-scrollbar {
    display: none;
}

.syntax-guide {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.guide-card {
    background: var(--light-bg);
    padding: 20px;
    border-radius: 10px;
    border-left: 4px solid var(--secondary-color);
}

.guide-card h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.syntax {
    background: #2c3e50;
    color: white;
    padding: 8px 12px;
    border-radius: 5px;
    font-family: 'Fira Code', monospace;
    font-size: 13px;
    margin: 5px 0;
    display: inline-block;
}


@keyframes slideIn {
    from {
        transform: translateY(-10px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Blockquote 样式 - 注释样式，字体变小，颜色变灰 */
blockquote {
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    border-left: 4px solid #6c757d;
    margin: 20px 0;
    padding: 15px 20px;
    font-size: 0.9em;
    color: #6c757d;
    font-style: italic;
    border-radius: 0 8px 8px 0;
    position: relative;
}

blockquote::before {
    content: "❝";
    font-size: 2em;
    color: #adb5bd;
    position: absolute;
    left: 10px;
    top: 5px;
    opacity: 0.5;
}

blockquote p {
    margin: 0;
    line-height: 1.5;
}

/* CodeBlock 样式 - 更鲜艳的样式 */
pre {
    background: linear-gradient(135deg, #2d3748, #4a5568);
    border: 1px solid #4a5568;
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    overflow-x: auto;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    position: relative;
    white-space: pre;
    font-family: 'Fira Code', monospace;
    font-size: 13px;
    line-height: 1.4;
    color: #e2e8f0;
}

pre::before {
    content: "</>";
    position: absolute;
    top: 10px;
    right: 15px;
    color: #81e6d9;
    font-size: 0.8em;
    font-weight: bold;
    opacity: 0.7;

}


/* 行内代码样式 */
:not(pre) > code {
    background: linear-gradient(135deg, #fed7e2, #fbb6ce);
    color: #702459;
    padding: 2px 6px;
    border-radius: 4px;
    line-height: 1.4;
    border: 1px solid #fbb6ce;
}

.footer {
    text-align: center;
    color: white;
    margin-top: 30px;
    opacity: 0.8;
}

@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }

    .syntax-guide {
        grid-template-columns: 1fr;
    }

    .header h1 {
        font-size: 2rem;
    }
}