:root {
    --primary: #1E293B;
    --secondary: #64748B;
    --accent: #3B82F6;
    --bg-light: #F8FAFC;
    --border: #E2E8F0;
    --text-main: #334155;
    --text-dark: #0F172A;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
}

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

body {
    font-family: var(--font-sans);
    color: var(--text-main);
    background-color: #FFFFFF;
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header Styles */
header {
    background: #FFFFFF;
    border-bottom: 1px solid var(--border);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-weight: 700;
    color: var(--primary);
    font-size: 1.25rem;
    text-decoration: none;
}

.source-link-btn {
    background-color: var(--accent);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    transition: background 0.2s;
}

.source-link-btn:hover {
    background-color: #2563EB;
}

/* Layout */
.container {
    display: flex;
    flex: 1;
}

/* Sidebar */
aside {
    width: 280px;
    background: var(--bg-light);
    border-right: 1px solid var(--border);
    padding: 2rem 1.5rem;
    height: calc(100vh - 64px);
    position: sticky;
    top: 64px;
    overflow-y: auto;
}

aside nav ul {
    list-style: none;
}

aside nav ul li {
    margin-bottom: 0.5rem;
}

aside nav ul li a {
    color: var(--secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    display: block;
    padding: 0.5rem;
    border-radius: 4px;
    transition: all 0.2s;
}

aside nav ul li a:hover, aside nav ul li a.active {
    background: #FFFFFF;
    color: var(--accent);
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

/* Main Content */
main {
    flex: 1;
    padding: 3rem 4rem;
    max-width: 900px;
}

h1 { color: var(--text-dark); font-size: 2.25rem; margin-bottom: 1.5rem; }
h2 { color: var(--text-dark); font-size: 1.5rem; margin-top: 2.5rem; margin-bottom: 1rem; border-bottom: 1px solid var(--border); padding-bottom: 0.5rem; }
h3 { color: var(--text-dark); font-size: 1.25rem; margin-top: 1.5rem; margin-bottom: 0.75rem; }

p { margin-bottom: 1.25rem; }

code {
    font-family: var(--font-mono);
    background: var(--bg-light);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--accent);
}

pre {
    background: var(--primary);
    color: #F8FAFC;
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 1.5rem;
}

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

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
}

th, td {
    text-align: left;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
}

th {
    background: var(--bg-light);
    color: var(--primary);
    font-weight: 600;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-dark);
}

input, textarea, select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-family: var(--font-sans);
}

button[type="submit"] {
    background: var(--accent);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
}

/* Footer */
footer {
    padding: 2rem;
    text-align: center;
    border-top: 1px solid var(--border);
    color: var(--secondary);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
    .container { flex-direction: column; }
    aside { width: 100%; height: auto; position: static; }
    main { padding: 2rem; }
}