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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Helvetica Neue", sans-serif, "Microsoft YaHei", "微软雅黑";
            color: #333;
            line-height: 1.6;
            background-color: #f8f9fa;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.3s ease;
        }

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

        .ztyy-navbar {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: white;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
            transition: all 0.3s ease;
        }

        .ztyy-navbar-inner {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
            height: 70px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .ztyy-logo {
            height: 40px;
            display: flex;
            align-items: center;
        }

        .ztyy-logo img {
            height: 100%;
            width: auto;
        }

        .ztyy-nav-menu {
            display: flex;
            gap: 40px;
            align-items: center;
            list-style: none;
        }

        .ztyy-nav-link {
            font-size: 15px;
            color: #333;
            font-weight: 500;
            position: relative;
            padding: 5px 0;
        }

        .ztyy-nav-link:hover {
            color: #0084ff;
        }

        .ztyy-nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, #0084ff, #00d4ff);
            transition: width 0.3s ease;
        }

        .ztyy-nav-link:hover::after {
            width: 100%;
        }

        .ztyy-nav-link.active {
            color: #0084ff;
        }

        .ztyy-nav-link.active::after {
            width: 100%;
        }

        .ztyy-help-header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 60px 20px;
            text-align: center;
        }

        .ztyy-help-header-content {
            max-width: 800px;
            margin: 0 auto;
        }

        .ztyy-help-title {
            font-size: 42px;
            font-weight: 700;
            margin-bottom: 20px;
        }

        .ztyy-help-subtitle {
            font-size: 18px;
            opacity: 0.95;
            margin-bottom: 30px;
        }

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

        .ztyy-search-input {
            flex: 1;
            padding: 14px 20px;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            background: white;
            color: #333;
        }

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

        .ztyy-search-btn {
            padding: 14px 30px;
            background: #0084ff;
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .ztyy-search-btn:hover {
            background: #0070d9;
            transform: translateY(-2px);
        }

        .ztyy-help-container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 60px 20px;
        }

        .ztyy-help-layout {
            display: grid;
            grid-template-columns: 280px 1fr;
            gap: 40px;
        }

        .ztyy-sidebar {
            background: white;
            border-radius: 12px;
            padding: 30px 20px;
            height: fit-content;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
            position: sticky;
            top: 90px;
        }

        .ztyy-sidebar-title {
            font-size: 14px;
            font-weight: 700;
            color: #999;
            text-transform: uppercase;
            margin-bottom: 15px;
            letter-spacing: 0.5px;
        }

        .ztyy-sidebar-menu {
            list-style: none;
        }

        .ztyy-sidebar-item {
            margin-bottom: 8px;
        }

        .ztyy-sidebar-link {
            display: block;
            padding: 12px 15px;
            color: #333;
            font-size: 15px;
            border-radius: 6px;
            transition: all 0.3s ease;
            position: relative;
            padding-left: 20px;
        }

        .ztyy-sidebar-link::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 0;
            background: linear-gradient(180deg, #0084ff, #00d4ff);
            border-radius: 2px;
            transition: height 0.3s ease;
        }

        .ztyy-sidebar-link:hover {
            background: #f0f5ff;
            color: #0084ff;
        }

        .ztyy-sidebar-link:hover::before {
            height: 16px;
        }

        .ztyy-sidebar-link.active {
            background: #f0f5ff;
            color: #0084ff;
            font-weight: 600;
        }

        .ztyy-sidebar-link.active::before {
            height: 20px;
        }

        .ztyy-content {
            background: white;
            border-radius: 12px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
            overflow: hidden;
        }

        .ztyy-content-section {
            padding: 40px;
            border-bottom: 1px solid #f0f0f0;
        }

        .ztyy-content-section:last-child {
            border-bottom: none;
        }

        .ztyy-section-title {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 30px;
            color: #333;
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .ztyy-section-icon {
            font-size: 28px;
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            border-radius: 8px;
            color: white;
        }

        .ztyy-faq-list {
            list-style: none;
        }

        .ztyy-faq-item {
            margin-bottom: 20px;
            background: #f8f9fa;
            border-radius: 8px;
            overflow: hidden;
            border-left: 4px solid #0084ff;
        }

        .ztyy-faq-question {
            padding: 18px 24px;
            font-size: 16px;
            font-weight: 600;
            color: #333;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            user-select: none;
            transition: all 0.3s ease;
        }

        .ztyy-faq-question:hover {
            background: #f0f5ff;
        }

        .ztyy-faq-toggle {
            font-size: 20px;
            color: #0084ff;
            transition: transform 0.3s ease;
        }

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

        .ztyy-faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            padding: 0 24px;
        }

        .ztyy-faq-item.active .ztyy-faq-answer {
            max-height: 500px;
            padding: 0 24px 20px 24px;
        }

        .ztyy-faq-answer-text {
            font-size: 15px;
            line-height: 1.8;
            color: #666;
        }

        .ztyy-category-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 20px;
            margin-bottom: 30px;
        }

        .ztyy-category-card {
            background: linear-gradient(135deg, #f5f7fa 0%, #f0f5ff 100%);
            border-radius: 12px;
            padding: 25px;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s ease;
            border: 2px solid transparent;
        }

        .ztyy-category-card:hover {
            transform: translateY(-8px);
            border-color: #0084ff;
            box-shadow: 0 12px 24px rgba(0, 132, 255, 0.15);
        }

        .ztyy-category-icon {
            font-size: 40px;
            margin-bottom: 15px;
        }

        .ztyy-category-name {
            font-size: 16px;
            font-weight: 600;
            color: #333;
            margin-bottom: 8px;
        }

        .ztyy-category-desc {
            font-size: 13px;
            color: #999;
        }

        .ztyy-tutorial-list {
            list-style: none;
        }

        .ztyy-tutorial-item {
            background: #f8f9fa;
            border-radius: 8px;
            padding: 20px;
            margin-bottom: 15px;
            display: flex;
            align-items: flex-start;
            gap: 20px;
            transition: all 0.3s ease;
        }

        .ztyy-tutorial-item:hover {
            background: #f0f5ff;
            transform: translateX(8px);
        }

        .ztyy-tutorial-number {
            flex-shrink: 0;
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, #0084ff, #00d4ff);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 16px;
        }

        .ztyy-tutorial-content h4 {
            font-size: 16px;
            color: #333;
            margin-bottom: 8px;
        }

        .ztyy-tutorial-content p {
            font-size: 14px;
            color: #666;
            line-height: 1.6;
        }

        .ztyy-feedback-section {
            background: linear-gradient(135deg, #f5f7fa 0%, #f0f5ff 100%);
            border-radius: 12px;
            padding: 40px;
            text-align: center;
        }

        .ztyy-feedback-title {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 15px;
            color: #333;
        }

        .ztyy-feedback-desc {
            font-size: 16px;
            color: #666;
            margin-bottom: 25px;
        }

        .ztyy-feedback-form {
            background: white;
            border-radius: 8px;
            padding: 30px;
            margin-bottom: 25px;
        }

        .ztyy-form-group {
            margin-bottom: 20px;
            text-align: left;
        }

        .ztyy-form-label {
            display: block;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 8px;
            color: #333;
        }

        .ztyy-form-input,
        .ztyy-form-textarea {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 6px;
            font-size: 14px;
            font-family: inherit;
            transition: all 0.3s ease;
        }

        .ztyy-form-input:focus,
        .ztyy-form-textarea:focus {
            outline: none;
            border-color: #0084ff;
            box-shadow: 0 0 0 3px rgba(0, 132, 255, 0.1);
        }

        .ztyy-form-textarea {
            resize: vertical;
            min-height: 120px;
        }

        .ztyy-submit-btn {
            width: 100%;
            padding: 14px 28px;
            background: linear-gradient(135deg, #0084ff, #00d4ff);
            color: white;
            border: none;
            border-radius: 6px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .ztyy-submit-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 16px rgba(0, 132, 255, 0.3);
        }

        .ztyy-contact-info {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
        }

        .ztyy-contact-item {
            background: white;
            border-radius: 8px;
            padding: 20px;
            text-align: center;
        }

        .ztyy-contact-icon {
            font-size: 32px;
            margin-bottom: 12px;
        }

        .ztyy-contact-label {
            font-size: 14px;
            color: #999;
            margin-bottom: 8px;
        }

        .ztyy-contact-value {
            font-size: 16px;
            font-weight: 600;
            color: #0084ff;
        }

        .ztyy-footer {
            background: #1a1a1a;
            color: #fff;
            padding: 50px 20px 30px;
            margin-top: 80px;
        }

        .ztyy-footer-inner {
            max-width: 1280px;
            margin: 0 auto;
        }

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

        .ztyy-footer-col h4 {
            font-size: 15px;
            font-weight: 700;
            margin-bottom: 20px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .ztyy-footer-col ul {
            list-style: none;
        }

        .ztyy-footer-col li {
            margin-bottom: 12px;
        }

        .ztyy-footer-col a {
            color: #aaa;
            font-size: 14px;
            transition: all 0.3s ease;
        }

        .ztyy-footer-col a:hover {
            color: #0084ff;
        }

        .ztyy-footer-divider {
            height: 1px;
            background: #333;
            margin-bottom: 25px;
        }

        .ztyy-footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }

        .ztyy-footer-brand {
            font-size: 16px;
            font-weight: 700;
        }

        .ztyy-footer-copyright {
            font-size: 13px;
            color: #666;
        }

        .ztyy-footer-social {
            display: flex;
            gap: 20px;
        }

        .ztyy-social-link {
            width: 36px;
            height: 36px;
            background: #333;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 16px;
            transition: all 0.3s ease;
        }

        .ztyy-social-link:hover {
            background: #0084ff;
            transform: translateY(-3px);
        }

        .ztyy-breadcrumb {
            display: flex;
            gap: 8px;
            align-items: center;
            margin-bottom: 30px;
            font-size: 14px;
            color: #999;
        }

        .ztyy-breadcrumb a {
            color: #0084ff;
        }

        .ztyy-breadcrumb a:hover {
            text-decoration: underline;
        }

        .ztyy-breadcrumb-sep {
            color: #ddd;
        }

        @media (max-width: 768px) {
            .ztyy-help-layout {
                grid-template-columns: 1fr;
            }

            .ztyy-sidebar {
                position: static;
                top: auto;
            }

            .ztyy-help-title {
                font-size: 28px;
            }

            .ztyy-help-subtitle {
                font-size: 16px;
            }

            .ztyy-search-bar {
                flex-direction: column;
            }

            .ztyy-content-section {
                padding: 25px;
            }

            .ztyy-section-title {
                font-size: 20px;
            }

            .ztyy-category-grid {
                grid-template-columns: 1fr;
            }

            .ztyy-footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }

            .ztyy-nav-menu {
                gap: 20px;
                font-size: 14px;
            }

            .ztyy-help-header {
                padding: 40px 20px;
            }
        }

        @media (max-width: 480px) {
            .ztyy-help-title {
                font-size: 24px;
            }

            .ztyy-nav-menu {
                gap: 15px;
            }

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

            .ztyy-category-card {
                padding: 15px;
            }

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