/* ===== CSS Variables ===== */
:root {
    --primary-color: #3b82f6;
    --primary-dark: #2563eb;
    --secondary-color: #8b5cf6;
    --accent-color: #06b6d4;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;

    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-code: #1e1e1e;

    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;

    --border-color: rgba(148, 163, 184, 0.1);
    --glass-bg: rgba(30, 41, 59, 0.7);

    --sidebar-width: 280px;
    --top-bar-height: 60px;

    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
}

/* ===== Reset & Base ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    display: flex;
    min-height: 100vh;
}

/* ===== Mobile Menu Toggle ===== */
.mobile-menu-toggle {
    display: none;
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 1001;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 0.5rem;
    cursor: pointer;
    color: var(--text-primary);
}

/* ===== Sidebar ===== */
.sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    position: fixed;
    left: 0;
    top: 0;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    z-index: 1000;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

.logo-img {
    width: 36px;
    height: 36px;
    border-radius: 0.5rem;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
}

.logo span {
    color: var(--accent-color);
}

.version {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* ===== Search Box ===== */
.search-box {
    position: relative;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.search-box svg {
    position: absolute;
    left: 2rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.search-box input {
    width: 100%;
    padding: 0.75rem 0.75rem 0.75rem 2.5rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* ===== Sidebar Navigation ===== */
.sidebar-nav {
    flex: 1;
    padding: 1rem 0;
}

.nav-section {
    margin-bottom: 0.5rem;
}

.nav-section-title {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
}

.nav-section-title:hover {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary-color);
}

.nav-section-title.active {
    color: var(--primary-color);
}

.nav-section-title svg:first-child {
    width: 16px;
    height: 16px;
}

.nav-section-title .chevron {
    margin-left: auto;
    transition: transform var(--transition-base);
}

.nav-section-title.collapsed .chevron {
    transform: rotate(-90deg);
}

.nav-links {
    list-style: none;
    max-height: 500px;
    overflow: hidden;
    transition: max-height var(--transition-base);
}

.nav-links.collapsed {
    max-height: 0;
}

.nav-links li {
    margin: 0;
}

.nav-links a {
    display: block;
    padding: 0.5rem 1.5rem 0.5rem 3rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: all var(--transition-fast);
    border-left: 2px solid transparent;
}

.nav-links a:hover {
    color: var(--primary-color);
    background: rgba(59, 130, 246, 0.05);
}

.nav-links a.active {
    color: var(--primary-color);
    border-left-color: var(--primary-color);
    background: rgba(59, 130, 246, 0.1);
}

/* ===== Sidebar Footer ===== */
.sidebar-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--primary-color);
}

/* ===== Main Content ===== */
.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    min-height: 100vh;
}

/* ===== Top Bar ===== */
.top-bar {
    height: var(--top-bar-height);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

.breadcrumbs {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
}

.breadcrumbs a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.breadcrumbs a:hover {
    color: var(--primary-color);
}

.breadcrumbs span {
    color: var(--text-muted);
}

/* ===== Content ===== */
.content {
    max-width: 900px;
    padding: 3rem 2rem;
    margin: 0 auto;
}

.content h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.content h2 {
    font-size: 1.875rem;
    font-weight: 600;
    margin-top: 3rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.content h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

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

.lead {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* ===== Info Boxes ===== */
.info-box {
    display: flex;
    gap: 1rem;
    padding: 1rem 1.5rem;
    border-radius: 0.5rem;
    margin: 1.5rem 0;
    border-left: 4px solid;
}

.info-box svg {
    flex-shrink: 0;
    margin-top: 0.25rem;
}

.info-box.info {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--info-color);
    color: var(--text-primary);
}

.info-box.warning {
    background: rgba(245, 158, 11, 0.1);
    border-color: var(--warning-color);
    color: var(--text-primary);
}

.info-box.success {
    background: rgba(16, 185, 129, 0.1);
    border-color: var(--success-color);
    color: var(--text-primary);
}

.info-box.danger {
    background: rgba(239, 68, 68, 0.1);
    border-color: var(--danger-color);
    color: var(--text-primary);
}

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

.feature-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.5rem;
    transition: all var(--transition-base);
}

.feature-box:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.feature-icon {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.feature-box h3 {
    font-size: 1.125rem;
    margin-top: 0;
    margin-bottom: 0.5rem;
}

.feature-box p {
    font-size: 0.875rem;
    margin-bottom: 0;
}

/* ===== Next Steps ===== */
.next-steps {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin: 2rem 0;
}

.step-card {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    text-decoration: none;
    transition: all var(--transition-base);
}

.step-card:hover {
    border-color: var(--primary-color);
    transform: translateX(5px);
}

.step-number {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    font-weight: 700;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
}

.step-content h3 {
    margin: 0 0 0.25rem 0;
    font-size: 1.125rem;
    color: var(--text-primary);
}

.step-content p {
    margin: 0;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.step-card svg {
    color: var(--primary-color);
    flex-shrink: 0;
}

/* ===== Page Navigation ===== */
.page-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.page-nav-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    text-decoration: none;
    padding: 1rem;
    border-radius: 0.5rem;
    transition: all var(--transition-base);
    min-width: 200px;
}

.page-nav-item:hover {
    background: var(--bg-secondary);
}

.page-nav-item.next {
    text-align: right;
    align-items: flex-end;
}

.page-nav-item span {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.page-nav-item strong {
    color: var(--primary-color);
    font-size: 1rem;
}

/* ===== Code Blocks ===== */
pre {
    background: var(--bg-code);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 1.5rem;
    overflow-x: auto;
    margin: 1.5rem 0;
}

code {
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.875rem;
    color: var(--accent-color);
}

pre code {
    color: var(--text-primary);
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
    }

    .sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition-base);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
    }

    .content {
        padding: 2rem 1rem;
    }

    .content h1 {
        font-size: 2rem;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }

    .page-nav {
        flex-direction: column;
        gap: 1rem;
    }

    .page-nav-item.next {
        text-align: left;
        align-items: flex-start;
    }
}