* {
            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;
            color: #333;
            background-color: #f8f9fa;
            line-height: 1.6;
        }

        /* Navigation Bar */
        .gcs5s-navbar {
            background: #fff;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .gcs5s-navbar-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0 20px;
            height: 70px;
        }

        .gcs5s-logo {
            flex-shrink: 0;
        }

        .gcs5s-logo img {
            height: 40px;
            width: auto;
        }

        .gcs5s-nav-menu {
            display: flex;
            list-style: none;
            gap: 40px;
            flex: 1;
            margin-left: 60px;
        }

        .gcs5s-nav-menu a {
            text-decoration: none;
            color: #333;
            font-size: 15px;
            font-weight: 500;
            transition: color 0.3s;
            position: relative;
        }

        .gcs5s-nav-menu a:hover {
            color: #f23;
        }

        .gcs5s-nav-menu a.gcs5s-active {
            color: #f23;
        }

        .gcs5s-nav-menu a.gcs5s-active::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 0;
            right: 0;
            height: 3px;
            background: #f23;
            border-radius: 2px;
        }

        .gcs5s-nav-cta {
            margin-left: auto;
        }

        .gcs5s-nav-cta a {
            background: #f23;
            color: #fff;
            padding: 10px 24px;
            border-radius: 4px;
            text-decoration: none;
            font-size: 14px;
            font-weight: 600;
            transition: background 0.3s;
        }

        .gcs5s-nav-cta a:hover {
            background: #d1001a;
        }

        /* Support Header Section */
        .gcs5s-support-header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: #fff;
            padding: 60px 20px;
            text-align: center;
        }

        .gcs5s-support-header-content {
            max-width: 700px;
            margin: 0 auto;
        }

        .gcs5s-support-header h1 {
            font-size: 42px;
            font-weight: 700;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }

        .gcs5s-support-header p {
            font-size: 18px;
            opacity: 0.95;
            margin-bottom: 32px;
        }

        .gcs5s-support-search {
            display: flex;
            gap: 8px;
            max-width: 500px;
            margin: 0 auto;
        }

        .gcs5s-support-search input {
            flex: 1;
            padding: 14px 18px;
            border: none;
            border-radius: 4px;
            font-size: 15px;
            background: rgba(255, 255, 255, 0.95);
            color: #333;
        }

        .gcs5s-support-search input::placeholder {
            color: #999;
        }

        .gcs5s-support-search button {
            padding: 14px 32px;
            background: #f23;
            color: #fff;
            border: none;
            border-radius: 4px;
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s;
        }

        .gcs5s-support-search button:hover {
            background: #d1001a;
        }

        /* Quick Navigation */
        .gcs5s-quick-nav {
            background: #fff;
            padding: 40px 20px;
            border-bottom: 1px solid #e8e8e8;
        }

        .gcs5s-quick-nav-container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .gcs5s-quick-nav h2 {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 30px;
            color: #333;
        }

        .gcs5s-quick-nav-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
        }

        .gcs5s-quick-nav-item {
            padding: 24px;
            background: #f8f9fa;
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.3s;
            text-decoration: none;
            color: #333;
            border: 2px solid transparent;
        }

        .gcs5s-quick-nav-item:hover {
            border-color: #f23;
            box-shadow: 0 8px 16px rgba(242, 51, 0, 0.08);
            transform: translateY(-2px);
        }

        .gcs5s-quick-nav-item-icon {
            font-size: 32px;
            margin-bottom: 12px;
            display: block;
        }

        .gcs5s-quick-nav-item-title {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .gcs5s-quick-nav-item-desc {
            font-size: 13px;
            color: #666;
            line-height: 1.5;
        }

        /* Main Content */
        .gcs5s-support-main {
            max-width: 1200px;
            margin: 0 auto;
            padding: 60px 20px;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }

        .gcs5s-faq-section {
            background: #fff;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
        }

        .gcs5s-faq-category {
            border-bottom: 1px solid #e8e8e8;
        }

        .gcs5s-faq-category:last-child {
            border-bottom: none;
        }

        .gcs5s-faq-category-header {
            padding: 24px;
            background: #f8f9fa;
            font-size: 16px;
            font-weight: 600;
            color: #333;
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .gcs5s-faq-category-icon {
            font-size: 20px;
        }

        .gcs5s-faq-items {
            padding: 0;
        }

        .gcs5s-faq-item {
            border-bottom: 1px solid #e8e8e8;
        }

        .gcs5s-faq-item:last-child {
            border-bottom: none;
        }

        .gcs5s-faq-question {
            padding: 20px 24px;
            cursor: pointer;
            user-select: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: background 0.2s;
            font-weight: 500;
            color: #333;
        }

        .gcs5s-faq-question:hover {
            background: #f8f9fa;
        }

        .gcs5s-faq-toggle {
            font-size: 18px;
            transition: transform 0.3s;
            flex-shrink: 0;
        }

        .gcs5s-faq-item.gcs5s-active .gcs5s-faq-toggle {
            transform: rotate(180deg);
            color: #f23;
        }

        .gcs5s-faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            background: #fafbfc;
        }

        .gcs5s-faq-item.gcs5s-active .gcs5s-faq-answer {
            max-height: 500px;
        }

        .gcs5s-faq-answer-content {
            padding: 20px 24px;
            font-size: 14px;
            line-height: 1.8;
            color: #555;
        }

        /* Sidebar */
        .gcs5s-sidebar {
            position: sticky;
            top: 100px;
            height: fit-content;
        }

        .gcs5s-sidebar-card {
            background: #fff;
            border-radius: 8px;
            padding: 24px;
            margin-bottom: 20px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
        }

        .gcs5s-sidebar-card h3 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 16px;
            color: #333;
        }

        .gcs5s-sidebar-links {
            list-style: none;
        }

        .gcs5s-sidebar-links li {
            margin-bottom: 12px;
        }

        .gcs5s-sidebar-links a {
            color: #666;
            text-decoration: none;
            font-size: 14px;
            display: flex;
            align-items: center;
            gap: 8px;
            transition: color 0.3s;
        }

        .gcs5s-sidebar-links a:hover {
            color: #f23;
        }

        .gcs5s-sidebar-links a::before {
            content: '→';
            color: #ccc;
            transition: color 0.3s;
        }

        .gcs5s-sidebar-links a:hover::before {
            color: #f23;
        }

        .gcs5s-sidebar-contact {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: #fff;
            text-align: center;
        }

        .gcs5s-sidebar-contact h3 {
            color: #fff;
            margin-bottom: 16px;
        }

        .gcs5s-sidebar-contact p {
            font-size: 13px;
            margin-bottom: 16px;
            opacity: 0.95;
        }

        .gcs5s-sidebar-contact a {
            display: inline-block;
            background: rgba(255, 255, 255, 0.2);
            color: #fff;
            padding: 10px 20px;
            border-radius: 4px;
            text-decoration: none;
            font-size: 14px;
            font-weight: 600;
            transition: background 0.3s;
        }

        .gcs5s-sidebar-contact a:hover {
            background: rgba(255, 255, 255, 0.3);
        }

        /* Install Guide Section */
        .gcs5s-install-section {
            margin-top: 60px;
            background: #fff;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
            padding: 40px;
        }

        .gcs5s-install-section h2 {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 40px;
            color: #333;
        }

        .gcs5s-install-steps {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
        }

        .gcs5s-install-step {
            position: relative;
        }

        .gcs5s-install-step::before {
            content: attr(data-step);
            position: absolute;
            top: -20px;
            left: 0;
            font-size: 48px;
            font-weight: 700;
            color: rgba(242, 51, 0, 0.1);
            z-index: -1;
        }

        .gcs5s-install-step-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 48px;
            height: 48px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: #fff;
            border-radius: 50%;
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .gcs5s-install-step-title {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 12px;
            color: #333;
        }

        .gcs5s-install-step-desc {
            font-size: 14px;
            color: #666;
            line-height: 1.7;
        }

        /* Video/Help Section */
        .gcs5s-help-resources {
            margin-top: 60px;
            background: #fff;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
            padding: 40px;
        }

        .gcs5s-help-resources h2 {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 40px;
            color: #333;
        }

        .gcs5s-resources-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }

        .gcs5s-resource-card {
            border: 2px solid #e8e8e8;
            border-radius: 8px;
            padding: 24px;
            transition: all 0.3s;
            cursor: pointer;
        }

        .gcs5s-resource-card:hover {
            border-color: #f23;
            box-shadow: 0 8px 16px rgba(242, 51, 0, 0.08);
        }

        .gcs5s-resource-icon {
            font-size: 32px;
            margin-bottom: 16px;
        }

        .gcs5s-resource-title {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 8px;
            color: #333;
        }

        .gcs5s-resource-desc {
            font-size: 13px;
            color: #666;
            line-height: 1.6;
        }

        /* Footer */
        .gcs5s-footer {
            background: #2c3e50;
            color: #bbb;
            margin-top: 80px;
        }

        .gcs5s-footer-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 60px 20px;
        }

        .gcs5s-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .gcs5s-footer-section h4 {
            color: #fff;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 20px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .gcs5s-footer-section ul {
            list-style: none;
        }

        .gcs5s-footer-section li {
            margin-bottom: 12px;
        }

        .gcs5s-footer-section a {
            color: #bbb;
            text-decoration: none;
            font-size: 13px;
            transition: color 0.3s;
        }

        .gcs5s-footer-section a:hover {
            color: #fff;
        }

        .gcs5s-footer-bottom {
            border-top: 1px solid #444;
            padding-top: 30px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }

        .gcs5s-footer-brand {
            font-size: 14px;
            font-weight: 600;
            color: #fff;
        }

        .gcs5s-footer-copyright {
            font-size: 12px;
            color: #999;
        }

        .gcs5s-footer-social {
            display: flex;
            gap: 16px;
        }

        .gcs5s-footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            color: #bbb;
            text-decoration: none;
            transition: all 0.3s;
            font-size: 16px;
        }

        .gcs5s-footer-social a:hover {
            background: #f23;
            color: #fff;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .gcs5s-navbar-container {
                height: 60px;
                padding: 0 15px;
            }

            .gcs5s-nav-menu {
                gap: 20px;
                margin-left: 30px;
            }

            .gcs5s-nav-menu a {
                font-size: 13px;
            }

            .gcs5s-nav-cta {
                display: none;
            }

            .gcs5s-support-header h1 {
                font-size: 32px;
            }

            .gcs5s-support-header p {
                font-size: 16px;
            }

            .gcs5s-support-search {
                flex-direction: column;
            }

            .gcs5s-support-main {
                grid-template-columns: 1fr;
                padding: 40px 15px;
                gap: 30px;
            }

            .gcs5s-sidebar {
                position: static;
            }

            .gcs5s-quick-nav-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .gcs5s-install-steps {
                grid-template-columns: 1fr;
            }

            .gcs5s-footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 480px) {
            .gcs5s-navbar-menu {
                display: none;
            }

            .gcs5s-support-header {
                padding: 40px 15px;
            }

            .gcs5s-support-header h1 {
                font-size: 24px;
            }

            .gcs5s-quick-nav-grid {
                grid-template-columns: 1fr;
            }

            .gcs5s-install-section,
            .gcs5s-help-resources {
                padding: 24px 15px;
            }

            .gcs5s-faq-question {
                padding: 16px;
                font-size: 14px;
            }

            .gcs5s-faq-answer-content {
                padding: 16px;
                font-size: 13px;
            }
        }