:root {
            --color-bg: #ffffff;
            --color-header: #f6f8fa;
            --color-border: #d0d7de;
            --color-text: #1f2328;
            --color-muted: #656d76;
            --color-accent: #0969da;
            /* GitHub Blue */
            --color-envato: #82b440;
            /* ThemeForest Green */
            --sidebar-width: 280px;
            --nav-height: 64px;
        }

        * {
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', -apple-system, system-ui, sans-serif;
            line-height: 1.6;
            color: var(--color-text);
            background-color: var(--color-bg);
            margin: 0;
        }

        /* --- STICKY NAVBAR --- */
        .navbar {
            height: var(--nav-height);
            background-color: #24292f;
            color: white;
            display: flex;
            align-items: center;
            padding: 0 24px;
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1000;
            justify-content: space-between;
        }

        .nav-brand {
            font-weight: 600;
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .nav-links a {
            color: #c9d1d9;
            text-decoration: none;
            font-size: 14px;
            margin-left: 20px;
        }

        .nav-links a:hover {
            color: white;
        }

        .menu-toggle {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 24px;
            cursor: pointer;
        }

        /* --- LAYOUT --- */
        .wrapper {
            display: flex;
            margin-top: var(--nav-height);
        }

        /* --- SIDEBAR (Nested & Collapsible) --- */
        .sidebar {
            width: var(--sidebar-width);
            height: calc(100vh - var(--nav-height));
            border-right: 1px solid var(--color-border);
            position: fixed;
            background: var(--color-header);
            overflow-y: auto;
            padding-top: 20px;
            transition: 0.3s;
        }

        .nav-group {
            margin-bottom: 5px;
        }

        .nav-parent {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 10px 24px;
            cursor: pointer;
            font-size: 14px;
            font-weight: 600;
            color: var(--color-text);
        }

        .nav-parent:hover {
            background: #eaedf0;
        }

        .nav-children {
            display: none;
            list-style: none;
            padding: 0;
            background: #fff;
        }

        .nav-group.active .nav-children {
            display: block;
        }

        .nav-group.active .arrow {
            transform: rotate(90deg);
        }

        .nav-children a {
            display: block;
            padding: 8px 24px 8px 40px;
            text-decoration: none;
            color: var(--color-muted);
            font-size: 13.5px;
        }

        .nav-children a:hover {
            color: var(--color-accent);
            background: #f6f8fa;
        }

        .nav-children a.active {
            color: var(--color-accent);
            background: #f6f8fa;
            font-weight: 600;
        }

        .arrow {
            border: solid var(--color-muted);
            border-width: 0 2px 2px 0;
            display: inline-block;
            padding: 3px;
            transform: rotate(-45deg);
            transition: 0.2s;
        }

        /* --- CONTENT AREA --- */
        .content {
            margin-left: var(--sidebar-width);
            padding: 40px 80px;
            width: 100%;
            max-width: 1000px;
        }

        h1 {
            border-bottom: 1px solid var(--color-border);
            padding-bottom: 0.3em;
            font-size: 2.25rem;
        }

        h2 {
            border-bottom: 1px solid var(--color-border);
            padding-bottom: 0.3em;
            margin-top: 40px;
        }

        /* --- COMPONENTS: List Styles --- */
        .feature-list {
            list-style: none;
            padding: 0;
        }

        .feature-list li {
            position: relative;
            padding-left: 28px;
            margin-bottom: 10px;
        }

        .feature-list li::before {
            content: '✔';
            position: absolute;
            left: 0;
            color: var(--color-envato);
            font-weight: bold;
        }

        /* --- COMPONENTS: Tabs --- */
        .tab-wrapper {
            border: 1px solid var(--color-border);
            border-radius: 6px;
            margin: 25px 0;
        }

        .tab-nav {
            display: flex;
            background: var(--color-header);
            border-bottom: 1px solid var(--color-border);
        }

        .tab-btn {
            padding: 12px 20px;
            border: none;
            background: none;
            cursor: pointer;
            font-weight: 500;
            color: var(--color-muted);
            border-bottom: 2px solid transparent;
        }

        .tab-btn.active {
            color: var(--color-accent);
            border-bottom-color: var(--color-accent);
        }

        .tab-pane {
            padding: 20px;
            display: none;
        }

        .tab-pane.active {
            display: block;
        }

        /* --- COMPONENTS: Image --- */
        .img-box {
            border: 1px solid var(--color-border);
            border-radius: 8px;
            overflow: hidden;
            margin: 25px 0;
            background: #f6f8fa;
        }

        .img-box img {
            width: 100%;
            height: auto;
            display: block;
        }

        .img-caption {
            padding: 12px;
            font-size: 13px;
            color: var(--color-muted);
            background: white;
            border-top: 1px solid var(--color-border);
            text-align: center;
        }

        /* --- PAGINATION --- */
        .pagination {
            display: flex;
            justify-content: space-between;
            margin-top: 60px;
            padding-top: 30px;
            border-top: 1px solid var(--color-border);
        }

        .page-btn {
            text-decoration: none;
            padding: 15px 25px;
            border: 1px solid var(--color-border);
            border-radius: 6px;
            color: var(--color-accent);
            transition: 0.2s;
            width: 48%;
        }

        .page-btn:hover {
            border-color: var(--color-accent);
            background: #f6f8fa;
        }

        .page-btn span {
            display: block;
            color: var(--color-muted);
            font-size: 12px;
            font-weight: 400;
        }

        /* --- MOBILE RESPONSIVE --- */
        @media (max-width: 768px) {
            .menu-toggle {
                display: block;
            }

            .sidebar {
                transform: translateX(-100%);
                width: 100%;
                z-index: 999;
            }

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

            .content {
                margin-left: 0;
                padding: 20px;
            }

            .nav-links {
                display: none;
            }

    .page-btn {
        width: 100%;
    }
}

/* --- FAQ STYLES --- */
.os-tab-nav {
    display: flex;
    gap: 12px;
    margin: 25px 0;
    border-bottom: 1px solid var(--color-border);
}

.os-btn {
    padding: 10px 22px;
    background: none;
    border: none;
    cursor: pointer;
    font-weight: 600;
    color: var(--color-muted);
    border-bottom: 3px solid transparent;
}

.os-btn.active {
    color: #039be5;
    border-color: #039be5;
}

.os-content {
    display: none;
    padding: 25px;
    background: #fbfcfe;
    border: 1px solid var(--color-border);
    border-radius: 8px;
}

.os-content.active {
    display: block;
}

.step-tag {
    background: #039be5;
    color: #fff;
    font-size: 11px;
    padding: 3px 8px;
    border-radius: 4px;
    margin-right: 8px;
}

.setup-card {
    border-left: 4px solid #039be5;
    background: #fbfcfe;
    padding: 22px;
    margin-bottom: 25px;
}

.note {
    background: #fff3cd;
    border-left: 4px solid #ffc107;
    padding: 15px;
    margin: 20px 0;
    font-size: 14px;
}

.faq-section {
    margin: 30px 0;
}

.faq-category {
    background: #f8f9fa;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    margin-bottom: 20px;
    overflow: hidden;
}

.faq-category-header {
    background: #039be5;
    color: white;
    padding: 15px 20px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-category-header:hover {
    background: #0288d1;
}

.faq-category-icon {
    font-size: 20px;
    transition: transform 0.3s ease;
}

.faq-category.active .faq-category-icon {
    transform: rotate(180deg);
}

.faq-items {
    display: none;
    padding: 0;
}

.faq-items.active {
    display: block;
}

.faq-item {
    border-bottom: 1px solid #e9ecef;
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-question {
    padding: 15px 20px;
    background: #fff;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 500;
}

.faq-question:hover {
    background: #f1f3f4;
}

.faq-question-icon {
    color: #039be5;
    font-size: 16px;
    transition: transform 0.3s ease;
}

.faq-item.active .faq-question-icon {
    transform: rotate(45deg);
}

.faq-answer {
    display: none;
    padding: 20px;
    background: #f8f9fa;
    line-height: 1.6;
}

.faq-answer.active {
    display: block;
}

.search-box {
    background: #fff;
    border: 2px solid var(--color-border);
    border-radius: 8px;
    padding: 15px 20px;
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.search-input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 16px;
}

.search-icon {
    color: #039be5;
    font-size: 20px;
}

.highlight-box {
    background: #e3f2fd;
    border: 1px solid #bbdefb;
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
}

.quick-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
    margin: 20px 0;
}