:root {
    --bg-dark: #050505;
    --sidebar-bg: #0a0a0a;
    --accent-cyan: #00f2ff;
    --text-main: #e0e0e0;
    --text-dim: #888;
    --border-color: #333;
}

body {
    margin: 0;
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
}

.reader-container {
    display: flex;
    height: 100vh;
}

.sidebar {
    width: 250px;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    padding: 20px;
    display: flex;
    flex-direction: column;
}

.logo h1 {
    font-size: 24px;
    letter-spacing: 2px;
    margin-bottom: 40px;
    text-align: center;
}

.highlight {
    color: var(--accent-cyan);
    text-shadow: 0 0 10px var(--accent-cyan);
}

nav {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

nav a {
    color: var(--text-dim);
    text-decoration: none;
    padding: 10px;
    border-radius: 4px;
    transition: all 0.3s;
}

nav a:hover, nav a.active {
    background-color: rgba(0, 242, 255, 0.1);
    color: var(--accent-cyan);
}

.content-area {
    flex: 1;
    padding: 40px;
    overflow-y: auto;
    display: flex;
    justify-content: center;
}

.markdown-body {
    max-width: 800px;
    width: 100%;
}

/* Markdown Styling */
.markdown-body h1 { border-bottom: 2px solid var(--accent-cyan); padding-bottom: 10px; margin-top: 0; }
.markdown-body h2 { color: var(--accent-cyan); margin-top: 30px; }
.markdown-body blockquote {
    border-left: 4px solid var(--accent-cyan);
    padding-left: 20px;
    font-style: italic;
    color: var(--text-dim);
    margin: 20px 0;
}
.markdown-body p { font-size: 18px; margin-bottom: 20px; }

@media (max-width: 768px) {
    .reader-container { flex-direction: column; }
    .sidebar { width: 100%; height: auto; border-right: none; border-bottom: 1px solid var(--border-color); }
    .content-area { padding: 20px; }
}