:root {
    --bg-color: #1a1a1d;
    --surface-color: #2c2f33;
    --primary-color: #4a90e2;
    --text-color: #f0f0f0;
    --text-muted-color: #a9a9a9;
    --border-color: #444;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    display: flex;
    min-height: 100vh; 
    overflow: hidden; 
}

html {
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) var(--surface-color);
    font-size: 16px;
}

.main-view {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    
    height: 100vh; 
    min-width: 0;
}

header {
    background-color: var(--surface-color);
    padding: 1rem 1.5rem;
    border-bottom: 2px solid var(--border-color);
    text-align: left;
    flex-shrink: 0;
}

header h1 {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 1.8rem;
}

#sidebar {
    width: 300px;
    flex-shrink: 0;
    background-color: var(--surface-color);
    padding: 1.5rem;
    height: 100vh;
    overflow-y: auto;
    border-right: 2px solid var(--border-color);
}

#content {
    flex-grow: 1;
    padding: 2rem 3rem;
    overflow-y: scroll; 
    min-width: 0;
    overflow-wrap: break-word;
    word-wrap: break-word;
}

#sidebar ul {
    list-style: none;
}

#sidebar ul li a {
    display: block;
    color: var(--text-muted-color);
    text-decoration: none;
    padding: 0.75rem 1rem;
    border-radius: 6px;
    transition: background-color 0.2s ease, color 0.2s ease;
    font-weight: 500;
}

#sidebar ul li a:hover {
    background-color: rgba(74, 144, 226, 0.1);
    color: var(--primary-color);
}

#sidebar ul li a.active {
    background-color: var(--primary-color);
    color: #fff;
}

#content h1, #content h2, #content h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    margin-top: 2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

#content h1 { font-size: 2.2rem; }
#content h2 { font-size: 1.8rem; }
#content h3 { font-size: 1.5rem; }

#content p {
    margin-bottom: 1rem;
}

#content ul, #content ol {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
    overflow-wrap: break-word;
}

#content a {
    color: var(--primary-color);
    text-decoration: none;
}

#content a:hover {
    text-decoration: underline;
}

#content pre {
    background-color: #23241f;
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    overflow-x: auto; 
    font-family: "Fira Code", "Courier New", monospace;
    font-size: 0.9rem;
}

#content code {
    background-color: rgba(74, 144, 226, 0.2);
    color: var(--primary-color);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-family: "Fira Code", "Courier New", monospace;
    
    overflow-wrap: break-word;
    word-wrap: break-word;
    white-space: normal;
}

#content pre code {
    background-color: transparent;
    color: inherit;
    padding: 0;
    white-space: pre; 
    
    overflow-wrap: normal;
    word-wrap: normal;
}

#content img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 1.5rem 0;
    border-radius: 8px;
}

#content table {
    width: 100%;
    max-width: 100%;
    border-collapse: collapse;
    margin-bottom: 1.5rem;
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

#content table th,
#content table td {
    padding: 0.8rem 1rem;
    border: 1px solid var(--border-color);
    text-align: left;
    vertical-align: top;
    white-space: normal;
    overflow-wrap: break-word;
}

#content table th {
    background-color: var(--surface-color);
    color: var(--primary-color);
    font-weight: 600;
}

#content table tr:nth-child(even) {
    background-color: rgba(74, 144, 226, 0.05);
}

#content blockquote {
    border-left: 4px solid var(--primary-color);
    padding: 1rem 1.5rem;
    margin: 1.5rem 0;
    background-color: rgba(74, 144, 226, 0.08);
    color: var(--text-color);
    border-radius: 6px;
}

#content blockquote p:last-child {
    margin-bottom: 0;
}

#content hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 2rem 0;
}

#content strong, #content b {
    color: var(--primary-color);
    font-weight: 700;
}

#content em, #content i {
    font-style: italic;
}

#content s, #content del {
    text-decoration: line-through;
    color: var(--text-muted-color);
}

::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: var(--surface-color);
}

::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 20px;
    border: 3px solid var(--surface-color);
}

::-webkit-scrollbar-thumb:hover {
    background-color: var(--text-muted-color);
}

@media (max-width: 768px) {
    body {
        flex-direction: column;
        height: auto;
        overflow-y: auto;
    }

    .main-view {
        height: auto; 
    }

    #sidebar {
        width: 100%;
        height: auto;
        border-right: none;
        border-bottom: 2px solid var(--border-color);
        padding: 1rem;
    }

    #sidebar ul li a {
        padding: 0.5rem 0.75rem;
    }

    header {
        padding: 1rem;
    }

    header h1 {
        font-size: 1.5rem;
    }

    #content {
        padding: 1.5rem;
        height: auto; 
    }

    #content h1 { font-size: 1.8rem; }
    #content h2 { font-size: 1.5rem; }
    #content h3 { font-size: 1.3rem; }

    #content pre {
        padding: 1rem;
        font-size: 0.85rem;
    }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(15px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeOut {
  from {
    opacity: 1;
    transform: translateY(0);
  }
  to {
    opacity: 0;
    transform: translateY(15px);
  }
}

#content.content-fade-in {
  animation: fadeIn 0.3s ease-out forwards;
}

#content.content-fade-out {
  animation: fadeOut 0.25s ease-in forwards;
}