:root {
    --bg-color: #0f172a;
    --sidebar-bg: #1e293b;
    --text-color: #cbd5e1;
    --heading-color: #f8fafc;
    --accent-color: #38bdf8;
    --border-color: #334155;
    --hover-color: #334155;
    --code-bg: #1e293b;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-main);
    display: flex;
    height: 100vh;
    overflow: hidden;
    line-height: 1.6;
}

/* Sidebar */
#sidebar {
    width: 300px;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: transform 0.3s ease;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h1 {
    font-size: 1.2rem;
    color: var(--accent-color);
    font-weight: 700;
}

#nav-list {
    list-style: none;
    overflow-y: auto;
    flex-grow: 1;
    padding: 10px 0;
}

.nav-item {
    padding: 12px 20px;
    cursor: pointer;
    font-size: 0.95rem;
    color: var(--text-color);
    transition: background-color 0.2s, color 0.2s;
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background-color: var(--hover-color);
    color: #fff;
}

.nav-item.active {
    background-color: #33415550;
    border-left-color: var(--accent-color);
    color: var(--accent-color);
    font-weight: 600;
}

/* Main Content */
#main {
    flex-grow: 1;
    overflow-y: auto;
    padding: 40px;
    position: relative;
    scroll-behavior: smooth;
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

/* Typography & Markdown Styles */
h1,
h2,
h3,
h4,
h5,
h6 {
    color: var(--heading-color);
    margin-bottom: 1rem;
    margin-top: 2rem;
    line-height: 1.3;
}

h1 {
    font-size: 2.2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

h2 {
    font-size: 1.8rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.3rem;
}

h3 {
    font-size: 1.4rem;
    color: var(--accent-color);
}

p {
    margin-bottom: 1.2rem;
}

ul,
ol {
    margin-bottom: 1.2rem;
    padding-left: 2rem;
}

li {
    margin-bottom: 0.5rem;
}

a {
    color: var(--accent-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

blockquote {
    border-left: 4px solid var(--accent-color);
    padding-left: 1rem;
    margin-left: 0;
    margin-bottom: 1.2rem;
    color: #94a3b8;
    background: #1e293b50;
    padding: 1rem;
    border-radius: 4px;
}

code {
    background-color: var(--code-bg);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 0.9em;
    color: #e0e0e0;
}

pre {
    background-color: var(--code-bg);
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 1.5rem;
}

pre code {
    background-color: transparent;
    padding: 0;
    color: inherit;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1.5rem;
}

th,
td {
    border: 1px solid var(--border-color);
    padding: 10px;
    text-align: left;
}

th {
    background-color: var(--sidebar-bg);
    color: var(--heading-color);
}

/* Details & Summary */
details {
    background-color: #1e293b;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem;
    margin-bottom: 1rem;
}

summary {
    cursor: pointer;
    font-weight: 600;
    padding: 0.5rem;
    color: var(--accent-color);
    outline: none;
}

details[open] summary {
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 0.5rem;
}

/* Mobile Toggle */
#menu-toggle {
    display: none;
    position: fixed;
    top: 15px;
    right: 15px;
    z-index: 1000;
    background: var(--sidebar-bg);
    border: 1px solid var(--border-color);
    color: var(--heading-color);
    padding: 8px 12px;
    border-radius: 4px;
    cursor: pointer;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    #sidebar {
        position: fixed;
        left: -300px;
        height: 100%;
        z-index: 100;
        box-shadow: 2px 0 10px rgba(0, 0, 0, 0.5);
    }

    #sidebar.open {
        transform: translateX(300px);
    }

    #menu-toggle {
        display: block;
    }

    #main {
        padding: 20px;
    }
}