:root {
    --bg-primary: #0d0d0d;
    --bg-secondary: #1a1a1a;
    --bg-code: #141414;
    --border: #2a2a2a;
    --text-primary: #f5f5f5;
    --text-secondary: #a0a0a0;
    --accent: #e0e0e0;
    --radius: 8px;
    --shadow: 0 2px 8px rgba(0,0,0,0.3);
    --sidebar-width: 260px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: opacity 0.2s ease;
}

a:hover {
    opacity: 0.8;
}

/* Layout */
.layout {
    display: flex;
    min-height: 100vh;
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 1001;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.75rem;
    cursor: pointer;
    color: var(--text-primary);
}

.menu-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    margin: 4px 0;
    transition: 0.3s;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    padding: 2rem 1.5rem;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    z-index: 1000;
    transition: transform 0.3s ease;
}

.sidebar-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2rem;
    letter-spacing: -0.02em;
}

.nav-section {
    margin-bottom: 1.25rem;
}

.nav-title {
    font-size: 0.9rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    padding: 0.4rem 0;
}

.nav-links {
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-links li {
    margin-bottom: 0.25rem;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    display: block;
    padding: 0.4rem 0;
    transition: color 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
}

.nav-links a.active::after {
    content: '•';
    margin-left: 0.5rem;
    color: var(--text-secondary);
}

/* Main Content */
.main {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 3rem 4rem;
    max-width: calc(var(--sidebar-width) + 900px);
    min-width: 0;
}

/* Typography */
h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
    word-wrap: break-word;
}

h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-top: 3rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.lead {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* Code */
code {
    font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 0.85em;
    background: var(--bg-code);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    border: 1px solid var(--border);
    word-break: break-word;
}

pre {
    background: var(--bg-code);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    overflow-x: auto;
    margin: 1.5rem 0;
    -webkit-overflow-scrolling: touch;
}

pre code {
    background: none;
    border: none;
    padding: 0;
    font-size: 0.8rem;
    line-height: 1.6;
    word-break: normal;
}

/* Cards */
.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

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

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

td {
    color: var(--text-secondary);
}

/* Hero Section */
.hero {
    padding: 4rem 0;
    text-align: center;
    border-bottom: 1px solid var(--border);
    margin-bottom: 3rem;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero .lead {
    max-width: 600px;
    margin: 0 auto 2rem;
}

.hero .btn {
    margin: 0.5rem;
}

/* Feature Grid */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.feature {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
}

.feature-title {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.feature-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 500;
    transition: all 0.2s ease;
    text-align: center;
}

.btn-primary {
    background: var(--text-primary);
    color: var(--bg-primary);
}

.btn-primary:hover {
    opacity: 0.9;
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--border);
}

/* Lists */
ul, ol {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

li {
    margin-bottom: 0.5rem;
}

/* ===== RESPONSIVE BREAKPOINTS ===== */

/* Large Tablets (1024px) */
@media (max-width: 1024px) {
    .main {
        padding: 2.5rem 3rem;
    }
    
    .features {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Tablets (768px) */
@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }
    
    .sidebar {
        transform: translateX(-100%);
        width: 280px;
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
    }
    
    .sidebar-overlay.open {
        display: block;
    }
    
    .main {
        margin-left: 0;
        padding: 4rem 1.5rem 2rem;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.5rem;
        margin-top: 2rem;
    }
    
    .hero {
        padding: 3rem 0;
    }
    
    .hero h1 {
        font-size: 2.25rem;
    }
    
    .hero .lead {
        font-size: 1rem;
    }
    
    .features {
        grid-template-columns: 1fr;
    }
    
    th, td {
        padding: 0.5rem 0.75rem;
        font-size: 0.9rem;
    }
}

/* Small Phones (480px) */
@media (max-width: 480px) {
    .main {
        padding: 4rem 1rem 1.5rem;
    }
    
    h1 {
        font-size: 1.75rem;
    }
    
    h2 {
        font-size: 1.35rem;
    }
    
    h3 {
        font-size: 1.1rem;
    }
    
    .hero {
        padding: 2rem 0;
    }
    
    .hero h1 {
        font-size: 1.85rem;
    }
    
    .hero .lead {
        font-size: 0.95rem;
    }
    
    .btn {
        display: block;
        width: 100%;
        margin: 0.5rem 0;
    }
    
    pre {
        padding: 1rem;
        font-size: 0.75rem;
    }
    
    pre code {
        font-size: 0.75rem;
    }
    
    .feature {
        padding: 1rem;
    }
    
    th, td {
        padding: 0.5rem;
        font-size: 0.85rem;
    }
}

/* Extra Small (320px) */
@media (max-width: 320px) {
    .main {
        padding: 3.5rem 0.75rem 1rem;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    .hero h1 {
        font-size: 1.5rem;
    }
}

/* Syntax Highlighting (minimal) */
.token-keyword { color: #a0a0a0; }
.token-string { color: #d0d0d0; }
.token-number { color: #c0c0c0; }
.token-comment { color: #606060; font-style: italic; }
.token-function { color: #e0e0e0; }

/* Print Styles */
@media print {
    .sidebar, .menu-toggle {
        display: none;
    }
    
    .main {
        margin-left: 0;
        padding: 0;
    }
    
    body {
        background: white;
        color: black;
    }
}