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

        /* ========== 导航栏 ========== */
        .eb31-navbar {
            background: white;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .eb31-navbar-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 70px;
        }

        .eb31-logo {
            flex-shrink: 0;
        }

        .eb31-logo img {
            height: 40px;
            width: auto;
        }

        .eb31-nav-menu {
            display: flex;
            list-style: none;
            gap: 40px;
            flex: 1;
            margin-left: 60px;
        }

        .eb31-nav-item {
            position: relative;
        }

        .eb31-nav-link {
            text-decoration: none;
            color: #333;
            font-weight: 500;
            font-size: 14px;
            transition: color 0.3s;
            padding: 5px 0;
        }

        .eb31-nav-link:hover,
        .eb31-nav-link.active {
            color: #0084ff;
        }

        .eb31-nav-link.active::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            right: 0;
            height: 2px;
            background: #0084ff;
        }

        .eb31-nav-actions {
            display: flex;
            gap: 15px;
            align-items: center;
        }

        .eb31-download-btn {
            background: #0084ff;
            color: white;
            border: none;
            padding: 8px 20px;
            border-radius: 4px;
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            transition: background 0.3s;
            text-decoration: none;
            display: inline-block;
        }

        .eb31-download-btn:hover {
            background: #0066cc;
        }

        /* ========== 支持页面顶部 ========== */
        .eb31-support-header {
            background: linear-gradient(135deg, #0084ff 0%, #0066cc 100%);
            color: white;
            padding: 40px 20px;
            text-align: center;
        }

        .eb31-support-header-content {
            max-width: 800px;
            margin: 0 auto;
        }

        .eb31-header-title {
            font-size: 36px;
            font-weight: 700;
            margin-bottom: 15px;
        }

        .eb31-header-subtitle {
            font-size: 16px;
            opacity: 0.95;
            margin-bottom: 25px;
        }

        .eb31-search-box {
            display: flex;
            gap: 10px;
            max-width: 500px;
            margin: 0 auto;
        }

        .eb31-search-input {
            flex: 1;
            padding: 12px 16px;
            border: none;
            border-radius: 4px;
            font-size: 14px;
            outline: none;
        }

        .eb31-search-btn {
            background: white;
            color: #0084ff;
            border: none;
            padding: 12px 30px;
            border-radius: 4px;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.2s;
        }

        .eb31-search-btn:hover {
            transform: translateY(-2px);
        }

        /* ========== 主容器 ========== */
        .eb31-support-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 50px 20px;
        }

        /* ========== 快速导航 ========== */
        .eb31-quick-nav {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin-bottom: 60px;
        }

        .eb31-quick-nav-card {
            background: white;
            padding: 25px;
            border-radius: 8px;
            text-align: center;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
            transition: all 0.3s;
            cursor: pointer;
            text-decoration: none;
            color: inherit;
        }

        .eb31-quick-nav-card:hover {
            box-shadow: 0 8px 16px rgba(0, 0, 0, 0.12);
            transform: translateY(-4px);
        }

        .eb31-quick-nav-icon {
            font-size: 36px;
            margin-bottom: 12px;
            display: block;
        }

        .eb31-quick-nav-title {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 8px;
            color: #0084ff;
        }

        .eb31-quick-nav-desc {
            font-size: 13px;
            color: #666;
        }

        /* ========== FAQ部分 ========== */
        .eb31-faq-section {
            margin-bottom: 60px;
        }

        .eb31-section-title {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 30px;
            color: #333;
            position: relative;
            padding-bottom: 15px;
        }

        .eb31-section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 3px;
            background: #0084ff;
            border-radius: 2px;
        }

        .eb31-faq-category {
            margin-bottom: 40px;
        }

        .eb31-category-label {
            font-size: 14px;
            color: #0084ff;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 15px;
        }

        .eb31-accordion {
            border: 1px solid #e0e0e0;
            border-radius: 8px;
            overflow: hidden;
            background: white;
        }

        .eb31-accordion-item {
            border-bottom: 1px solid #e0e0e0;
        }

        .eb31-accordion-item:last-child {
            border-bottom: none;
        }

        .eb31-accordion-header {
            padding: 18px 20px;
            background: white;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: background 0.3s;
            font-weight: 500;
            font-size: 15px;
            color: #333;
        }

        .eb31-accordion-header:hover {
            background: #f8f9fa;
        }

        .eb31-accordion-header.active {
            background: #f0f7ff;
            color: #0084ff;
        }

        .eb31-accordion-toggle {
            width: 24px;
            height: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-size: 18px;
            transition: transform 0.3s;
        }

        .eb31-accordion-item.expanded .eb31-accordion-toggle {
            transform: rotate(180deg);
        }

        .eb31-accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            background: #fafafa;
        }

        .eb31-accordion-item.expanded .eb31-accordion-content {
            max-height: 500px;
        }

        .eb31-accordion-body {
            padding: 20px;
            font-size: 14px;
            line-height: 1.8;
            color: #555;
        }

        .eb31-accordion-body p {
            margin-bottom: 10px;
        }

        .eb31-accordion-body p:last-child {
            margin-bottom: 0;
        }

        /* ========== 分类导航 ========== */
        .eb31-category-tabs {
            display: flex;
            gap: 10px;
            margin-bottom: 30px;
            flex-wrap: wrap;
        }

        .eb31-category-tab {
            padding: 8px 16px;
            border: 2px solid #e0e0e0;
            background: white;
            border-radius: 20px;
            cursor: pointer;
            font-size: 14px;
            font-weight: 500;
            color: #666;
            transition: all 0.3s;
        }

        .eb31-category-tab:hover {
            border-color: #0084ff;
            color: #0084ff;
        }

        .eb31-category-tab.active {
            background: #0084ff;
            border-color: #0084ff;
            color: white;
        }

        /* ========== 教程卡片 ========== */
        .eb31-tutorials-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 25px;
            margin-bottom: 60px;
        }

        .eb31-tutorial-card {
            background: white;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
            transition: all 0.3s;
            text-decoration: none;
            color: inherit;
            display: flex;
            flex-direction: column;
        }

        .eb31-tutorial-card:hover {
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
            transform: translateY(-4px);
        }

        .eb31-tutorial-image {
            width: 100%;
            height: 180px;
            object-fit: cover;
            background: linear-gradient(135deg, #0084ff 0%, #0066cc 100%);
        }

        .eb31-tutorial-content {
            padding: 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .eb31-tutorial-category {
            font-size: 12px;
            color: #0084ff;
            font-weight: 600;
            text-transform: uppercase;
            margin-bottom: 8px;
        }

        .eb31-tutorial-title {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 10px;
            color: #333;
            flex: 1;
        }

        .eb31-tutorial-desc {
            font-size: 13px;
            color: #666;
            margin-bottom: 15px;
            flex: 1;
        }

        .eb31-tutorial-link {
            color: #0084ff;
            font-size: 13px;
            font-weight: 600;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 5px;
        }

        .eb31-tutorial-link:hover {
            text-decoration: underline;
        }

        /* ========== 故障排查 ========== */
        .eb31-troubleshoot-section {
            background: white;
            padding: 40px;
            border-radius: 8px;
            margin-bottom: 60px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
        }

        .eb31-troubleshoot-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
        }

        .eb31-troubleshoot-item {
            padding: 20px;
            border-left: 4px solid #0084ff;
            background: #f8f9fa;
            border-radius: 4px;
            transition: all 0.3s;
        }

        .eb31-troubleshoot-item:hover {
            background: #f0f7ff;
            box-shadow: 0 4px 12px rgba(0, 132, 255, 0.15);
        }

        .eb31-troubleshoot-title {
            font-size: 15px;
            font-weight: 600;
            color: #333;
            margin-bottom: 10px;
        }

        .eb31-troubleshoot-desc {
            font-size: 13px;
            color: #666;
            margin-bottom: 12px;
        }

        .eb31-troubleshoot-link {
            font-size: 13px;
            color: #0084ff;
            text-decoration: none;
            font-weight: 600;
        }

        .eb31-troubleshoot-link:hover {
            text-decoration: underline;
        }

        /* ========== 联系支持 ========== */
        .eb31-support-contact {
            background: linear-gradient(135deg, #0084ff 0%, #0066cc 100%);
            color: white;
            padding: 50px 40px;
            border-radius: 8px;
            margin-bottom: 60px;
            text-align: center;
        }

        .eb31-contact-title {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 15px;
        }

        .eb31-contact-desc {
            font-size: 15px;
            margin-bottom: 30px;
            opacity: 0.95;
        }

        .eb31-contact-methods {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin-top: 30px;
        }

        .eb31-contact-method {
            background: rgba(255, 255, 255, 0.1);
            padding: 20px;
            border-radius: 8px;
            backdrop-filter: blur(10px);
        }

        .eb31-contact-method-title {
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .eb31-contact-method-text {
            font-size: 13px;
            opacity: 0.9;
        }

        /* ========== 下载步骤 ========== */
        .eb31-install-steps {
            background: white;
            padding: 40px;
            border-radius: 8px;
            margin-bottom: 60px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
        }

        .eb31-steps-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 25px;
        }

        .eb31-step-card {
            text-align: center;
            position: relative;
        }

        .eb31-step-card:not(:last-child)::after {
            content: '→';
            position: absolute;
            right: -20px;
            top: 30px;
            font-size: 24px;
            color: #0084ff;
        }

        .eb31-step-number {
            width: 50px;
            height: 50px;
            background: #0084ff;
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            font-weight: 700;
            margin: 0 auto 15px;
        }

        .eb31-step-title {
            font-size: 15px;
            font-weight: 600;
            color: #333;
            margin-bottom: 10px;
        }

        .eb31-step-desc {
            font-size: 13px;
            color: #666;
            line-height: 1.6;
        }

        /* ========== 页脚 ========== */
        .eb31-footer {
            background: #1a1a1a;
            color: #ccc;
            padding: 50px 20px 30px;
            margin-top: 80px;
        }

        .eb31-footer-content {
            max-width: 1200px;
            margin: 0 auto;
        }

        .eb31-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .eb31-footer-column h3 {
            color: white;
            font-size: 15px;
            font-weight: 600;
            margin-bottom: 15px;
        }

        .eb31-footer-links {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .eb31-footer-link {
            color: #ccc;
            text-decoration: none;
            font-size: 13px;
            transition: color 0.3s;
        }

        .eb31-footer-link:hover {
            color: #0084ff;
        }

        .eb31-footer-brand {
            margin-bottom: 15px;
            padding-bottom: 15px;
            border-bottom: 1px solid #333;
        }

        .eb31-brand-name {
            font-size: 16px;
            font-weight: 700;
            color: white;
            margin-bottom: 8px;
        }

        .eb31-brand-desc {
            font-size: 13px;
            color: #999;
            line-height: 1.6;
        }

        .eb31-footer-bottom {
            border-top: 1px solid #333;
            padding-top: 30px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }

        .eb31-footer-copyright {
            font-size: 12px;
            color: #999;
        }

        .eb31-footer-social {
            display: flex;
            gap: 15px;
        }

        .eb31-social-link {
            width: 36px;
            height: 36px;
            background: #333;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #ccc;
            text-decoration: none;
            font-size: 16px;
            transition: all 0.3s;
        }

        .eb31-social-link:hover {
            background: #0084ff;
            color: white;
        }

        /* ========== 响应式设计 ========== */
        @media (max-width: 768px) {
            .eb31-navbar-content {
                flex-direction: column;
                height: auto;
                padding: 15px 20px;
            }

            .eb31-nav-menu {
                flex-direction: column;
                gap: 15px;
                margin-left: 0;
                margin-top: 15px;
                width: 100%;
            }

            .eb31-header-title {
                font-size: 24px;
            }

            .eb31-support-header {
                padding: 30px 20px;
            }

            .eb31-section-title {
                font-size: 22px;
            }

            .eb31-quick-nav {
                grid-template-columns: repeat(2, 1fr);
            }

            .eb31-tutorials-grid {
                grid-template-columns: 1fr;
            }

            .eb31-step-card:not(:last-child)::after {
                content: '↓';
                right: auto;
                top: auto;
                bottom: -15px;
            }

            .eb31-troubleshoot-list {
                grid-template-columns: 1fr;
            }

            .eb31-footer-grid {
                grid-template-columns: 1fr;
                gap: 25px;
            }

            .eb31-footer-bottom {
                flex-direction: column;
                text-align: center;
            }

            .eb31-support-container {
                padding: 30px 20px;
            }

            .eb31-troubleshoot-section,
            .eb31-install-steps {
                padding: 30px 20px;
            }

            .eb31-search-box {
                flex-direction: column;
            }
        }

        @media (max-width: 480px) {
            .eb31-nav-menu {
                display: none;
            }

            .eb31-header-title {
                font-size: 18px;
            }

            .eb31-quick-nav {
                grid-template-columns: 1fr;
            }

            .eb31-section-title {
                font-size: 18px;
            }

            .eb31-accordion-header {
                padding: 15px 15px;
                font-size: 14px;
            }

            .eb31-accordion-body {
                padding: 15px;
                font-size: 13px;
            }

            .eb31-tutorial-card {
                margin-bottom: 15px;
            }

            .eb31-support-contact {
                padding: 30px 20px;
            }

            .eb31-contact-title {
                font-size: 18px;
            }

            .eb31-contact-methods {
                grid-template-columns: 1fr;
            }
        }

        /* ========== 打印样式 ========== */
        @media print {
            .eb31-navbar,
            .eb31-search-box,
            .eb31-support-contact,
            .eb31-footer {
                display: none;
            }

            .eb31-accordion-content {
                max-height: none !important;
            }

            .eb31-accordion-item.expanded .eb31-accordion-content {
                max-height: none !important;
            }
        }