@import url('https://fonts.googleapis.com/css2?family=Fira+Code:wght@400;500&family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700&display=swap');

:root {
    --bg-main: #0b0f17;
    --bg-sidebar: #101520;
    --bg-card: #161f30;
    --bg-code: #1a2333;
    
    --border-color: #223047;
    
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --color-primary: #10b981; /* North African Emerald */
    --color-primary-hover: #34d399;
    --color-secondary: #0ea5e9; /* Sky Blue */
    --color-accent: #f59e0b; /* Amber */
    
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-heading: 'Outfit', var(--font-sans);
    --font-mono: 'Fira Code', monospace;
    
    --header-height: 70px;
    --sidebar-width: 280px;
    --toc-width: 240px;
    --max-content-width: 860px;
}

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

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Scrollbars */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-main);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

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

/* Header */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--bg-sidebar);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    z-index: 100;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    font-weight: 700;
    font-size: 1.5rem;
    color: #fff;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.2);
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    color: var(--text-primary);
}

.logo-version {
    font-size: 0.75rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
    margin-left: 0.5rem;
}

.top-nav {
    display: flex;
    gap: 1.5rem;
}

.top-nav a {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
}

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

.search-container {
    position: relative;
}

.search-input {
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 1rem 0.5rem 2.5rem;
    border-radius: 20px;
    width: 220px;
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

.search-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
    width: 260px;
}

.search-icon {
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 0.9rem;
    pointer-events: none;
}

/* Layout */
.app-container {
    display: flex;
    margin-top: var(--header-height);
    min-height: calc(100vh - var(--header-height));
}

/* Sidebar */
aside.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    padding: 2rem 1.5rem;
    position: fixed;
    top: var(--header-height);
    bottom: 0;
    left: 0;
    overflow-y: auto;
    z-index: 90;
}

.sidebar-section {
    margin-bottom: 2rem;
}

.sidebar-title {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    user-select: none;
}
.sidebar-title:hover { color: var(--color-primary); }
.sidebar-title .arrow { font-size: 0.7rem; margin-left: 0.4rem; font-family: var(--font-mono); }
.sidebar-links[data-expanded="false"] { max-height: 0; overflow: hidden; transition: max-height 0.2s ease; }

.sidebar-links {
    list-style: none;
}

.sidebar-links li {
    margin-bottom: 0.4rem;
}

.sidebar-links a {
    color: var(--text-secondary);
    font-size: 0.92rem;
    display: block;
    padding: 0.35rem 0.6rem;
    border-radius: 6px;
    transition: all 0.15s ease;
}

.sidebar-links a:hover {
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.02);
}

.sidebar-links a.active {
    color: var(--color-primary);
    background-color: rgba(16, 185, 129, 0.08);
    font-weight: 500;
    border-left: 2px solid var(--color-primary);
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
    padding-left: calc(0.6rem - 2px);
}

/* Submenu styles */
.sidebar-links li.has-submenu > a {
    padding-right: 1.8rem;
    position: relative;
}
.sidebar-links .arrow {
    position: absolute;
    right: 0.6rem;
    font-size: 0.75rem;
    transition: transform 0.15s ease;
    font-family: var(--font-mono);
}
.submenu {
    list-style: none;
    padding-left: 0.8rem;
    margin-top: 0.3rem;
    margin-bottom: 0.3rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.2s ease;
}
.submenu[data-expanded="true"] {
    max-height: 500px;
}
.submenu li {
    margin-bottom: 0.25rem;
}
.submenu .sub-link {
    font-size: 0.82rem;
    padding: 0.2rem 0.6rem;
    border-left: 1px solid var(--border-color);
    border-radius: 0;
    color: var(--text-muted);
}
.submenu .sub-link:hover {
    color: var(--text-secondary);
    background-color: rgba(255, 255, 255, 0.02);
    border-left-color: var(--color-primary);
}

/* Main Content Area */
main.content-wrapper {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 2.5rem 3rem;
    display: flex;
    justify-content: center;
}

.content-body {
    max-width: var(--max-content-width);
    width: 100%;
}

/* Breadcrumbs */
.breadcrumbs {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.breadcrumbs a {
    color: var(--text-secondary);
}

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

/* Article Typography */
article h1 {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
}

article h2 {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 600;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

article h3 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 600;
    margin-top: 1.75rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

article p {
    margin-bottom: 1.25rem;
    color: var(--text-secondary);
}

article ul, article ol {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

article li {
    margin-bottom: 0.5rem;
}

/* Code & Formatting */
code {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    background-color: var(--bg-code);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    color: #f43f5e; /* Rose */
}

pre {
    background-color: var(--bg-code);
    border: 1px solid var(--border-color);
    padding: 1.25rem;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 1.5rem;
}

pre code {
    background-color: transparent;
    padding: 0;
    color: var(--text-primary);
    font-size: 0.9rem;
}

/* Syntax Highlighting Classes */
.kw { color: #f472b6; font-weight: 500; }  /* Keyword - Pink */
.nd { color: #f472b6; }                      /* Built-in names / Decorators */
.str { color: #34d399; }                     /* String - Emerald */
.num { color: #fb923c; }                     /* Number - Orange */
.comment { color: #64748b; font-style: italic; } /* Comment - Gray */
.typ { color: #38bdf8; }                     /* Type - Sky blue */
.fn { color: #60a5fa; }                      /* Function Name - Blue */
.op { color: #f87171; }                      /* Operator - Red */

/* Alerts */
.alert {
    padding: 1rem 1.25rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    border-left: 4px solid;
    font-size: 0.95rem;
}

.alert p:last-child {
    margin-bottom: 0;
}

.alert-note {
    background-color: rgba(14, 165, 233, 0.08);
    border-color: var(--color-secondary);
    color: #7dd3fc;
}

.alert-tip {
    background-color: rgba(16, 185, 129, 0.08);
    border-color: var(--color-primary);
    color: #6ee7b7;
}

.alert-warning {
    background-color: rgba(245, 158, 11, 0.08);
    border-color: var(--color-accent);
    color: #fde047;
}

.alert-danger {
    background-color: rgba(239, 68, 68, 0.08);
    border-color: #ef4444;
    color: #fca5a5;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

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

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

tr:hover {
    background-color: rgba(255, 255, 255, 0.01);
}

/* Page Navigation */
.page-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 3.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.nav-card {
    display: flex;
    flex-direction: column;
    width: 48%;
    padding: 1rem 1.25rem;
    border: 1px solid var(--border-color);
    background-color: var(--bg-sidebar);
    border-radius: 8px;
    transition: all 0.2s ease;
}

.nav-card:hover {
    border-color: var(--color-primary);
    background-color: var(--bg-card);
}

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

.nav-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.nav-title {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Table of Contents (Right Side) */
aside.toc-wrapper {
    width: var(--toc-width);
    position: fixed;
    top: calc(var(--header-height) + 2.5rem);
    right: 2rem;
    bottom: 2rem;
    overflow-y: auto;
    padding-left: 1.5rem;
    border-left: 1px solid var(--border-color);
    display: block;
}

.toc-title {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.toc-links {
    list-style: none;
}

.toc-links li {
    margin-bottom: 0.5rem;
}

.toc-links a {
    color: var(--text-secondary);
    font-size: 0.85rem;
    display: block;
    line-height: 1.4;
}

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

.toc-links li.indent-2 {
    padding-left: 1rem;
}

/* Footer */
footer {
    margin-top: 4rem;
    padding: 2rem 0;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Landing Page Specific */
.hero-section {
    text-align: center;
    padding: 3rem 0;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #fff 30%, var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2.5rem auto;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 4rem;
}

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.2s ease;
}

.btn-primary {
    background-color: var(--color-primary);
    color: #fff;
    box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-1px);
}

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

.btn-secondary:hover {
    background-color: var(--border-color);
    transform: translateY(-1px);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-bottom: 4rem;
}

.feature-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all 0.2s ease;
}

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

.feature-icon {
    font-size: 1.5rem;
    color: var(--color-primary);
    margin-bottom: 0.75rem;
}

.feature-title {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

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

/* Hamburger menu toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 110;
}
.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-secondary);
    border-radius: 2px;
    transition: all 0.3s ease;
}
.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}
.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Back to top button */
#back-to-top {
    position: fixed; bottom: 2rem; right: 2rem;
    width: 44px; height: 44px; border-radius: 50%;
    background: var(--color-primary); color: #fff; border: none;
    cursor: pointer; display: flex; align-items: center; justify-content: center;
    font-size: 1.2rem; opacity: 0; visibility: hidden;
    transition: all 0.3s ease; z-index: 999;
    box-shadow: 0 4px 16px rgba(16,185,129,0.3);
}
#back-to-top.visible { opacity: 1; visibility: visible; }
#back-to-top:hover { background: var(--color-primary-hover); transform: translateY(-3px); }

/* Responsiveness */
@media (max-width: 1400px) {
    aside.toc-wrapper {
        display: none;
    }
}

@media (max-width: 1024px) {
    main.content-wrapper {
        padding: 2rem;
    }
}

@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }
    aside.sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: 280px;
        z-index: 200;
        transform: translateX(-100%);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        border-right: 1px solid var(--border-color);
        border-bottom: none;
        padding: 5rem 1.5rem 2rem;
        overflow-y: auto;
    }
    aside.sidebar.open {
        transform: translateX(0);
    }
    .sidebar-backdrop {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 199;
        backdrop-filter: blur(2px);
    }
    .sidebar-backdrop.show {
        display: block;
    }
    main.content-wrapper {
        margin-left: 0;
        padding: 1.5rem;
    }
    .features-grid {
        grid-template-columns: 1fr;
    }
    .menu-toggle {
        display: flex;
    }
    .top-nav {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--bg-sidebar);
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        gap: 0;
        padding: 0.5rem 0;
        box-shadow: 0 8px 24px rgba(0,0,0,0.3);
    }
    .top-nav.open {
        display: flex;
    }
    .top-nav a {
        padding: 0.75rem 1.5rem;
        border-bottom: 1px solid var(--border-color);
    }
    .top-nav a:last-child {
        border-bottom: none;
    }
    .search-container {
        display: none;
    }
    header {
        padding: 0 1rem;
    }
    .hero-title {
        font-size: 2.5rem;
    }
    #back-to-top {
        bottom: 1rem; right: 1rem;
        width: 38px; height: 38px;
        font-size: 1rem;
    }
}
/* Page Layout and Search Results Styles */
.sidebar-title { cursor: pointer; user-select: none; }
.sidebar-title:hover { color: var(--color-primary); }
.sidebar-title .arrow { font-size: 0.7rem; margin-left: 0.4rem; font-family: var(--font-mono); }
.sidebar-links[data-expanded="false"] { max-height: 0; overflow: hidden; }

.feature-icon {
    width: 48px; height: 48px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 12px;
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-primary);
    font-size: 1.25rem;
    margin-bottom: 1rem;
    transition: all 0.3s ease;
}
.feature-card:hover .feature-icon {
    background: var(--color-primary);
    color: #fff;
    transform: scale(1.05) translateY(-1px);
    box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
}
.feature-card {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}
.feature-card.reveal {
    opacity: 1;
    transform: translateY(0);
}
.hero-section {
    animation: fadeInDown 0.6s ease;
}
@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to   { opacity: 1; transform: translateY(0); }
}

.search-container { position: relative; }
#search-results {
    position: absolute; top: calc(100% + 8px); right: 0; width: 380px;
    max-height: 400px; overflow-y: auto;
    background: var(--bg-card); border: 1px solid var(--border-color);
    border-radius: 12px; box-shadow: 0 8px 32px rgba(0,0,0,0.4);
    display: none; z-index: 200;
}
#search-results.show { display: block; }
#search-results .result-item {
    display: block; padding: 0.75rem 1rem; border-bottom: 1px solid var(--border-color);
    color: var(--text-primary); text-decoration: none; transition: background 0.15s;
}
#search-results .result-item:last-child { border-bottom: none; }
#search-results .result-item:hover { background: rgba(16,185,129,0.08); }
#search-results .result-item .result-title { font-weight: 600; font-size: 0.9rem; }
#search-results .result-item .result-desc { color: var(--text-muted); font-size: 0.8rem; margin-top: 2px; }
#search-results .result-empty { padding: 1.5rem; text-align: center; color: var(--text-muted); font-size: 0.9rem; }

.pre-wrapper { position: relative; }
.copy-btn {
    position: absolute; top: 8px; right: 8px;
    background: rgba(255,255,255,0.06); border: 1px solid var(--border-color);
    color: var(--text-secondary); border-radius: 6px; padding: 4px 10px;
    font-size: 0.75rem; cursor: pointer; opacity: 0;
    transition: opacity 0.2s, background 0.2s;
}
.pre-wrapper:hover .copy-btn { opacity: 1; }
.copy-btn:hover { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.copy-btn.copied { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.toc-links li.active a { color: var(--color-primary); font-weight: 600; }