:root {
    --primary: #00f2fe;
    --secondary: #4facfe;
    --bg-dark: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.7);
    --text-main: #f1f5f9;
    --text-dim: #94a3b8;
    --border: rgba(255, 255, 255, 0.1);
    --accent: #fbbf24;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

/* Sidebar */
nav {
    width: 280px;
    background: rgba(15, 23, 42, 0.95);
    border-right: 1px solid var(--border);
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    height: 100vh;
    overflow-y: auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 1.2rem;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1rem;
}

.nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-links li {
    padding: 0.75rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-dim);
    font-size: 0.95rem;
}

.nav-links li:hover {
    background: var(--bg-card);
    color: var(--text-main);
}

.nav-links li.active {
    background: rgba(79, 172, 254, 0.1);
    color: var(--secondary);
    border-left: 3px solid var(--secondary);
}

/* Main Content */
main {
    flex: 1;
    overflow-y: auto;
    padding: 3rem;
    background: radial-gradient(circle at top right, rgba(79, 172, 254, 0.05), transparent);
}

#content {
    max-width: 800px;
    margin: 0 auto;
    animation: fadeIn 0.4s ease-out;
}

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

/* Markdown Styling */
#content h1 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, #fff, var(--text-dim));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

#content h2 {
    font-size: 1.8rem;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    color: var(--secondary);
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.5rem;
}

#content h3 {
    font-size: 1.3rem;
    margin-top: 2rem;
    margin-bottom: 0.8rem;
    color: var(--primary);
}

#content p {
    line-height: 1.7;
    margin-bottom: 1.2rem;
    color: var(--text-dim);
}

#content blockquote {
    border-left: 4px solid var(--secondary);
    background: var(--bg-card);
    padding: 1rem 1.5rem;
    margin: 1.5rem 0;
    font-style: italic;
    border-radius: 0 8px 8px 0;
}

#content pre {
    background: #000;
    padding: 1.2rem;
    border-radius: 12px;
    overflow-x: auto;
    margin: 1.5rem 0;
    border: 1px solid var(--border);
}

#content code {
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
    color: var(--accent);
}

#content ul, #content ol {
    margin: 1rem 1.5rem;
    color: var(--text-dim);
}

#content li {
    margin-bottom: 0.5rem;
}

#content hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 3rem 0;
}

/* Responsive */
@media (max-width: 768px) {
    body { flex-direction: column; }
    nav { width: 100%; height: auto; padding: 1rem; }
    main { padding: 1.5rem; }
}