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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
            background-color: #000000;
            color: #ffffff;
            line-height: 1.6;
        }

        /* Header */
        .header {
            background: #000000;
            border-bottom: 1px solid #374151;
            padding: 12px 16px;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            transition: all 0.3s ease;
        }

        .header.scrolled {
            background: rgba(0, 0, 0, 0.9);
            backdrop-filter: blur(16px);
        }

        .header-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
            max-width: 1200px;
            margin: 0 auto;
        }

        .logo-section {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .logo {
            height: 28px;
        }

        .nav-bar {
            display: none;
            align-items: center;
            gap: 32px;
        }

        .nav-bar a {
            color: #d1d5db;
            text-decoration: none;
            transition: color 0.2s;
        }

        .nav-bar a:hover {
            color: #ffffff;
        }

        .header-right {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .language-selector {
            position: relative;
        }

        .language-btn {
            width: 20px;
            height: 20px;
            cursor: pointer;
        }

        .language-dropdown {
            position: absolute;
            top: 30px;
            left: 50%;
            transform: translateX(-50%);
            background: #1f2937;
            border: 1px solid #374151;
            border-radius: 8px;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
            min-width: 120px;
            display: none;
            z-index: 50;
        }

        .language-dropdown.show {
            display: block;
        }

        .language-dropdown a {
            display: block;
            padding: 8px 12px;
            color: #d1d5db;
            text-decoration: none;
            font-size: 14px;
            transition: background 0.2s;
        }

        .language-dropdown a:hover {
            background: #374151;
        }

        .language-dropdown a:first-child {
            color: #ffffff;
        }

        .login-link {
            color: #d1d5db;
            text-decoration: none;
            transition: color 0.2s;
        }

        .login-link:hover {
            color: #ffffff;
        }

        .menu-toggle {
            display: block;
            background: none;
            border: none;
            color: #ffffff;
            cursor: pointer;
            padding: 8px;
        }

        .mobile-menu {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.95);
            backdrop-filter: blur(16px);
            z-index: 40;
            display: none;
            align-items: center;
            justify-content: center;
        }

        .mobile-menu.show {
            display: flex;
        }

        .mobile-menu-content {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 32px;
        }

        .mobile-menu-content a {
            color: #d1d5db;
            text-decoration: none;
            font-size: 24px;
            transition: color 0.2s;
        }

        .mobile-menu-content a:hover {
            color: #ffffff;
        }

        @media (min-width: 768px) {
            .nav-bar {
                display: flex;
            }

            .menu-toggle {
                display: none;
            }
        }

        /* Layout */
        .container {
            display: flex;
            min-height: calc(100vh - 57px);
            margin-top: 57px;
        }

        /* Sidebar */
        .sidebar {
            width: 288px;
            background: #111827;
            border-right: 1px solid #374151;
            overflow-y: auto;
            height: calc(100vh - 57px);
            position: sticky;
            top: 57px;
        }

        .sidebar-nav {
            padding: 16px;
        }

        .nav-item {
            margin-bottom: 8px;
        }

        .nav-link {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 8px 12px;
            border-radius: 6px;
            text-decoration: none;
            color: #d1d5db;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.2s;
        }

        .nav-link:hover {
            background: #1f2937;
        }

        .nav-link.active {
            background: #1e40af;
            color: #ffffff;
        }

        .nav-arrow {
            width: 16px;
            height: 16px;
            transition: transform 0.2s;
        }

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

        .subnav {
            margin-left: 16px;
            margin-top: 8px;
            display: none;
        }

        .subnav.expanded {
            display: block;
        }

        .subnav-item {
            padding: 6px 12px;
            border-radius: 4px;
            color: #9ca3af;
            font-size: 14px;
            cursor: pointer;
            transition: all 0.2s;
        }

        .subnav-item:hover {
            background: #1f2937;
        }

        .subnav-item.active {
            background: #1e40af;
            color: #ffffff;
            font-weight: 500;
        }

        /* Main Content Area */
        .main-content-area {
            flex: 1;
            display: flex;
        }

        /* Main Content */
        .main-content {
            flex: 1;
            max-width: calc(100% - 240px);
        }

        /* Right Sidebar - Quick Nav */
        .right-sidebar {
            width: 240px;
            background: #111827;
            border-left: 1px solid #374151;
            height: calc(100vh - 57px);
            position: sticky;
            top: 57px;
            overflow-y: auto;
        }

        .quick-nav {
            padding: 16px;
        }

        .quick-nav h3 {
            font-size: 14px;
            font-weight: 600;
            color: #ffffff;
            margin-bottom: 12px;
        }

        .quick-nav a {
            display: block;
            color: #ffffff;
            text-decoration: none;
            font-size: 14px;
            padding: 4px 0;
            transition: color 0.2s;
        }

        .quick-nav a:hover {
            color: #ffffff;
        }

        .breadcrumb {
            background: #111827;
            border-bottom: 1px solid #374151;
            padding: 16px 24px;
        }

        .breadcrumb-nav {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: #9ca3af;
        }

        .breadcrumb-nav a {
            color: #9ca3af;
            text-decoration: none;
        }

        .breadcrumb-nav a:hover {
            color: #3b82f6;
        }

        .breadcrumb-current {
            color: #ffffff;
        }

        .content {
            max-width: 1024px;
            margin: 0 auto;
            padding: 32px 24px;
        }

        .content-card {
            background: #111827;
            border-radius: 8px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
            border: 1px solid #374151;
            padding: 32px;
        }

        .page-title {
            font-size: 30px;
            font-weight: bold;
            color: #ffffff;
            margin-bottom: 16px;
        }

        .last-updated {
            font-size: 14px;
            color: #9ca3af;
            margin-bottom: 32px;
        }

        .faq-section {
            margin-bottom: 48px;
        }

        .faq-section:not(:last-child) {
            border-bottom: 1px solid #374151;
            padding-bottom: 32px;
        }

        .faq-title {
            font-size: 24px;
            font-weight: 600;
            color: #ffffff;
            margin-bottom: 24px;
        }

        .faq-content {
            color: #d1d5db;
            line-height: 1.7;
        }

        .faq-content p {
            margin-bottom: 16px;
        }

        .category-title {
            font-size: 20px;
            font-weight: 600;
            color: #ffffff;
            margin-bottom: 16px;
        }

        .feature-list {
            list-style: none;
            margin: 24px 0;
        }

        .feature-list li {
            display: flex;
            align-items: flex-start;
            margin-bottom: 12px;
        }

        .bullet {
            width: 8px;
            height: 8px;
            background: #3b82f6;
            border-radius: 50%;
            margin-right: 12px;
            margin-top: 8px;
            flex-shrink: 0;
        }

        /* Mobile Styles */
        @media (max-width: 1024px) {
            .sidebar {
                position: fixed;
                left: -288px;
                top: 57px;
                z-index: 50;
                transition: left 0.3s ease;
            }

            .sidebar.open {
                left: 0;
            }

            .sidebar-overlay {
                position: fixed;
                inset: 0;
                background: rgba(0, 0, 0, 0.7);
                z-index: 40;
                display: none;
            }

            .sidebar-overlay.open {
                display: block;
            }

            .main-content-area {
                flex-direction: column;
            }

            .main-content {
                max-width: 100%;
            }

            .right-sidebar {
                width: 100%;
                height: auto;
                position: static;
                order: -1;
                border-left: none;
                border-bottom: 1px solid #374151;
            }

            .content {
                padding: 24px 16px;
            }

            .content-card {
                padding: 24px;
            }
        }

        @media (max-width: 768px) {
            .right-sidebar {
                padding: 16px;
            }

            .quick-nav {
                padding: 0;
            }

            .quick-nav h3 {
                margin-bottom: 8px;
            }

            .quick-nav a {
                padding: 2px 0;
                font-size: 13px;
            }
        }