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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #fff;
        }

        /* 导航栏 */
        .ickfu-header {
            background: linear-gradient(135deg, #0088cc 0%, #00a0e9 100%);
            box-shadow: 0 2px 12px rgba(0, 136, 204, 0.15);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .ickfu-nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 2rem;
            max-width: 1400px;
            margin: 0 auto;
        }

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

        .ickfu-nav-menu {
            display: flex;
            gap: 2rem;
            list-style: none;
        }

        .ickfu-nav-menu a {
            color: #fff;
            text-decoration: none;
            font-weight: 500;
            transition: opacity 0.3s ease;
            font-size: 0.95rem;
        }

        .ickfu-nav-menu a:hover {
            opacity: 0.8;
        }

        .ickfu-nav-menu a.active {
            border-bottom: 3px solid #fff;
            padding-bottom: 0.25rem;
        }

        .ickfu-menu-toggle {
            display: none;
            flex-direction: column;
            background: none;
            border: none;
            cursor: pointer;
            gap: 5px;
        }

        .ickfu-menu-toggle span {
            width: 25px;
            height: 3px;
            background-color: #fff;
            border-radius: 2px;
            transition: 0.3s;
        }

        .ickfu-nav-overlay {
            display: none;
        }

        /* 常见问题页面顶部 */
        .ickfu-faq-header {
            background: linear-gradient(135deg, #0088cc 0%, #00a0e9 100%);
            color: #fff;
            padding: 4rem 2rem;
            text-align: center;
        }

        .ickfu-faq-header-content {
            max-width: 900px;
            margin: 0 auto;
        }

        .ickfu-faq-header h1 {
            font-size: 2.5rem;
            margin-bottom: 1rem;
            font-weight: 700;
        }

        .ickfu-faq-header p {
            font-size: 1.1rem;
            opacity: 0.95;
            margin-bottom: 2rem;
        }

        /* 搜索框 */
        .ickfu-search-box {
            max-width: 600px;
            margin: 0 auto;
            position: relative;
        }

        .ickfu-search-input {
            width: 100%;
            padding: 1rem 1.5rem 1rem 3rem;
            border: none;
            border-radius: 50px;
            font-size: 1rem;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            outline: none;
        }

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

        .ickfu-search-icon {
            position: absolute;
            left: 1.2rem;
            top: 50%;
            transform: translateY(-50%);
            color: #999;
            font-size: 1.2rem;
        }

        /* 主要内容区 */
        .ickfu-faq-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 3rem 2rem;
        }

        /* 分类导航 */
        .ickfu-category-nav {
            display: flex;
            gap: 1rem;
            margin-bottom: 3rem;
            flex-wrap: wrap;
            justify-content: center;
        }

        .ickfu-category-btn {
            padding: 0.75rem 1.5rem;
            border: 2px solid #e0e0e0;
            background: #fff;
            border-radius: 25px;
            cursor: pointer;
            font-size: 0.95rem;
            font-weight: 500;
            color: #333;
            transition: all 0.3s ease;
        }

        .ickfu-category-btn:hover {
            border-color: #0088cc;
            color: #0088cc;
        }

        .ickfu-category-btn.active {
            background: #0088cc;
            color: #fff;
            border-color: #0088cc;
        }

        /* FAQ内容 */
        .ickfu-faq-content {
            max-width: 900px;
            margin: 0 auto;
        }

        .ickfu-faq-item {
            margin-bottom: 1.5rem;
            border: 1px solid #e8e8e8;
            border-radius: 8px;
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .ickfu-faq-item:hover {
            box-shadow: 0 4px 15px rgba(0, 136, 204, 0.1);
            border-color: #0088cc;
        }

        .ickfu-faq-question {
            padding: 1.5rem;
            background: #f9f9f9;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
            transition: background 0.3s ease;
        }

        .ickfu-faq-item.active .ickfu-faq-question {
            background: #f0f7ff;
        }

        .ickfu-faq-question:hover {
            background: #f5f5f5;
        }

        .ickfu-faq-question h3 {
            font-size: 1.1rem;
            color: #0088cc;
            font-weight: 600;
            flex: 1;
            text-align: left;
        }

        .ickfu-faq-toggle {
            font-size: 1.5rem;
            color: #0088cc;
            transition: transform 0.3s ease;
            margin-left: 1rem;
            flex-shrink: 0;
        }

        .ickfu-faq-item.active .ickfu-faq-toggle {
            transform: rotate(180deg);
        }

        .ickfu-faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            padding: 0 1.5rem;
        }

        .ickfu-faq-item.active .ickfu-faq-answer {
            max-height: 1000px;
            padding: 1.5rem;
        }

        .ickfu-faq-answer p {
            color: #555;
            line-height: 1.8;
            margin-bottom: 1rem;
        }

        .ickfu-faq-answer p:last-child {
            margin-bottom: 0;
        }

        .ickfu-faq-answer ul,
        .ickfu-faq-answer ol {
            margin-left: 1.5rem;
            margin-bottom: 1rem;
        }

        .ickfu-faq-answer li {
            margin-bottom: 0.5rem;
            color: #555;
        }

        .ickfu-faq-answer strong {
            color: #0088cc;
            font-weight: 600;
        }

        /* 帮助信息卡片 */
        .ickfu-help-card {
            background: linear-gradient(135deg, #f0f7ff 0%, #e8f4ff 100%);
            border-left: 4px solid #0088cc;
            padding: 1.5rem;
            border-radius: 8px;
            margin-bottom: 2rem;
        }

        .ickfu-help-card h3 {
            color: #0088cc;
            margin-bottom: 0.5rem;
            font-size: 1.1rem;
        }

        .ickfu-help-card p {
            color: #333;
            font-size: 0.95rem;
        }

        /* 相关链接 */
        .ickfu-related-links {
            margin-top: 3rem;
            padding-top: 2rem;
            border-top: 2px solid #e8e8e8;
            text-align: center;
        }

        .ickfu-related-links h3 {
            color: #333;
            margin-bottom: 1.5rem;
            font-size: 1.2rem;
        }

        .ickfu-links-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1rem;
        }

        .ickfu-link-item {
            padding: 1rem;
            background: #f9f9f9;
            border-radius: 8px;
            text-decoration: none;
            color: #0088cc;
            font-weight: 500;
            transition: all 0.3s ease;
            border: 1px solid #e8e8e8;
        }

        .ickfu-link-item:hover {
            background: #0088cc;
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0, 136, 204, 0.2);
        }

        /* 页脚 */
        .ickfu-footer {
            background: #1a1a1a;
            color: #e0e0e0;
            padding: 3rem 2rem 1.5rem;
            margin-top: 4rem;
        }

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

        .ickfu-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }

        .ickfu-footer-section h4 {
            color: #fff;
            margin-bottom: 1rem;
            font-size: 1rem;
            font-weight: 600;
        }

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

        .ickfu-footer-section a {
            color: #b0b0b0;
            text-decoration: none;
            display: block;
            margin-bottom: 0.5rem;
            transition: color 0.3s ease;
            font-size: 0.9rem;
        }

        .ickfu-footer-section a:hover {
            color: #0088cc;
        }

        .ickfu-footer-brand {
            font-size: 1.1rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 0.5rem;
        }

        .ickfu-footer-desc {
            color: #999;
            font-size: 0.9rem;
            line-height: 1.6;
        }

        .ickfu-footer-bottom {
            border-top: 1px solid #333;
            padding-top: 1.5rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
        }

        .ickfu-footer-copy {
            color: #666;
            font-size: 0.9rem;
        }

        .ickfu-footer-links {
            display: flex;
            gap: 1.5rem;
        }

        .ickfu-footer-links a {
            color: #b0b0b0;
            text-decoration: none;
            font-size: 0.9rem;
            transition: color 0.3s ease;
        }

        .ickfu-footer-links a:hover {
            color: #0088cc;
        }

        /* 响应式设计 */
        @media (max-width: 768px) {
            .ickfu-menu-toggle {
                display: flex;
            }

            .ickfu-nav-menu {
                display: none;
                position: absolute;
                top: 70px;
                left: 0;
                right: 0;
                flex-direction: column;
                background: linear-gradient(135deg, #0088cc 0%, #00a0e9 100%);
                padding: 1rem 2rem;
                gap: 1rem;
                border-bottom: 2px solid #0077bb;
            }

            .ickfu-nav-menu.active {
                display: flex;
            }

            .ickfu-nav-menu a {
                padding: 0.75rem 0;
            }

            .ickfu-faq-header {
                padding: 2.5rem 1rem;
            }

            .ickfu-faq-header h1 {
                font-size: 1.8rem;
            }

            .ickfu-faq-header p {
                font-size: 1rem;
            }

            .ickfu-faq-container {
                padding: 2rem 1rem;
            }

            .ickfu-category-nav {
                gap: 0.5rem;
            }

            .ickfu-category-btn {
                padding: 0.6rem 1rem;
                font-size: 0.85rem;
            }

            .ickfu-faq-question {
                padding: 1rem;
            }

            .ickfu-faq-question h3 {
                font-size: 0.95rem;
            }

            .ickfu-faq-toggle {
                font-size: 1.2rem;
            }

            .ickfu-footer-grid {
                grid-template-columns: 1fr;
            }

            .ickfu-footer-bottom {
                flex-direction: column;
                justify-content: center;
                text-align: center;
            }

            .ickfu-footer-links {
                flex-direction: column;
                gap: 1rem;
            }

            .ickfu-help-card {
                margin-bottom: 1.5rem;
            }

            .ickfu-related-links {
                margin-top: 2rem;
            }
        }

        @media (max-width: 480px) {
            .ickfu-nav {
                padding: 1rem;
            }

            .ickfu-faq-header {
                padding: 2rem 1rem;
            }

            .ickfu-faq-header h1 {
                font-size: 1.5rem;
            }

            .ickfu-faq-question h3 {
                font-size: 0.85rem;
            }

            .ickfu-search-input {
                padding: 0.8rem 1rem 0.8rem 2.5rem;
                font-size: 0.9rem;
            }

            .ickfu-category-btn {
                padding: 0.5rem 0.8rem;
                font-size: 0.8rem;
            }

            .ickfu-faq-answer {
                padding: 0 1rem;
            }

            .ickfu-faq-item.active .ickfu-faq-answer {
                padding: 1rem;
            }

            .ickfu-links-grid {
                grid-template-columns: 1fr;
            }
        }