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

    body {
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
        line-height: 1.6;
        color: #333;
        background-color: #f8f9fa;
    }

    .zt31tn-header {
        background: #fff;
        box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 1000;
    }

    .zt31tn-nav {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 20px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: 70px;
    }

    .zt31tn-logo img {
        height: 40px;
        width: auto;
    }

    .zt31tn-menu-toggle {
        display: none;
        flex-direction: column;
        background: none;
        border: none;
        cursor: pointer;
        padding: 5px;
    }

    .zt31tn-menu-toggle span {
        width: 25px;
        height: 3px;
        background: #0088cc;
        margin: 3px 0;
        transition: 0.3s;
        border-radius: 2px;
    }

    .zt31tn-nav-menu {
        display: flex;
        list-style: none;
        gap: 30px;
    }

    .zt31tn-nav-menu a {
        text-decoration: none;
        color: #333;
        font-weight: 500;
        transition: color 0.3s;
        padding: 10px 0;
    }

    .zt31tn-nav-menu a:hover,
    .zt31tn-nav-menu a.active {
        color: #0088cc;
    }

    .zt31tn-nav-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0,0,0,0.5);
        z-index: 999;
    }

    .zt31tn-faq-container {
        margin-top: 70px;
        min-height: calc(100vh - 70px);
        padding: 40px 0;
    }

    .zt31tn-faq-header {
        background: linear-gradient(135deg, #0088cc 0%, #005580 100%);
        color: white;
        padding: 60px 0;
        text-align: center;
    }

    .zt31tn-faq-header-content {
        max-width: 800px;
        margin: 0 auto;
        padding: 0 20px;
    }

    .zt31tn-faq-title {
        font-size: 3rem;
        font-weight: 700;
        margin-bottom: 20px;
        text-shadow: 0 2px 4px rgba(0,0,0,0.3);
    }

    .zt31tn-faq-subtitle {
        font-size: 1.2rem;
        opacity: 0.9;
        margin-bottom: 40px;
    }

    .zt31tn-search-box {
        max-width: 500px;
        margin: 0 auto;
        position: relative;
    }

    .zt31tn-search-input {
        width: 100%;
        padding: 15px 50px 15px 20px;
        border: none;
        border-radius: 50px;
        font-size: 16px;
        outline: none;
        box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    }

    .zt31tn-search-btn {
        position: absolute;
        right: 5px;
        top: 50%;
        transform: translateY(-50%);
        background: #0088cc;
        border: none;
        width: 40px;
        height: 40px;
        border-radius: 50%;
        color: white;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: background 0.3s;
    }

    .zt31tn-search-btn:hover {
        background: #006699;
    }

    .zt31tn-faq-content {
        max-width: 1000px;
        margin: 0 auto;
        padding: 60px 20px;
    }

    .zt31tn-faq-categories {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 30px;
        margin-bottom: 60px;
    }

    .zt31tn-category-card {
        background: white;
        border-radius: 15px;
        padding: 30px;
        text-align: center;
        box-shadow: 0 5px 20px rgba(0,0,0,0.08);
        transition: transform 0.3s, box-shadow 0.3s;
        cursor: pointer;
        border: 2px solid transparent;
    }

    .zt31tn-category-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 10px 30px rgba(0,0,0,0.15);
        border-color: #0088cc;
    }

    .zt31tn-category-icon {
        font-size: 3rem;
        margin-bottom: 20px;
        display: block;
    }

    .zt31tn-category-title {
        font-size: 1.3rem;
        font-weight: 600;
        color: #333;
        margin-bottom: 10px;
    }

    .zt31tn-category-desc {
        color: #666;
        font-size: 0.95rem;
    }

    .zt31tn-faq-list {
        background: white;
        border-radius: 15px;
        overflow: hidden;
        box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    }

    .zt31tn-faq-item {
        border-bottom: 1px solid #eee;
    }

    .zt31tn-faq-item:last-child {
        border-bottom: none;
    }

    .zt31tn-faq-question {
        width: 100%;
        background: none;
        border: none;
        padding: 25px 30px;
        text-align: left;
        font-size: 1.1rem;
        font-weight: 600;
        color: #333;
        cursor: pointer;
        display: flex;
        justify-content: space-between;
        align-items: center;
        transition: background 0.3s, color 0.3s;
    }

    .zt31tn-faq-question:hover {
        background: #f8f9fa;
        color: #0088cc;
    }

    .zt31tn-faq-question.active {
        background: #0088cc;
        color: white;
    }

    .zt31tn-faq-icon {
        font-size: 1.2rem;
        transition: transform 0.3s;
    }

    .zt31tn-faq-question.active .zt31tn-faq-icon {
        transform: rotate(180deg);
    }

    .zt31tn-faq-answer {
        padding: 0 30px;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease-out, padding 0.3s;
        background: #f8f9fa;
    }

    .zt31tn-faq-answer.active {
        max-height: 500px;
        padding: 25px 30px;
    }

    .zt31tn-faq-answer-text {
        color: #555;
        line-height: 1.8;
        font-size: 1rem;
    }

    .zt31tn-help-section {
        background: white;
        margin: 60px 0;
        padding: 50px;
        border-radius: 15px;
        text-align: center;
        box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    }

    .zt31tn-help-title {
        font-size: 2rem;
        font-weight: 600;
        color: #333;
        margin-bottom: 20px;
    }

    .zt31tn-help-desc {
        color: #666;
        font-size: 1.1rem;
        margin-bottom: 30px;
        max-width: 600px;
        margin-left: auto;
        margin-right: auto;
    }

    .zt31tn-help-buttons {
        display: flex;
        gap: 20px;
        justify-content: center;
        flex-wrap: wrap;
    }

    .zt31tn-help-btn {
        padding: 15px 30px;
        border-radius: 50px;
        text-decoration: none;
        font-weight: 600;
        transition: all 0.3s;
        display: inline-flex;
        align-items: center;
        gap: 10px;
    }

    .zt31tn-help-btn-primary {
        background: #0088cc;
        color: white;
        border: 2px solid #0088cc;
    }

    .zt31tn-help-btn-primary:hover {
        background: #006699;
        border-color: #006699;
        transform: translateY(-2px);
    }

    .zt31tn-help-btn-secondary {
        background: transparent;
        color: #0088cc;
        border: 2px solid #0088cc;
    }

    .zt31tn-help-btn-secondary:hover {
        background: #0088cc;
        color: white;
        transform: translateY(-2px);
    }

    .zt31tn-footer {
        background: #2c3e50;
        color: white;
        padding: 60px 0 30px;
    }

    .zt31tn-footer-content {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 20px;
    }

    .zt31tn-footer-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 40px;
        margin-bottom: 40px;
    }

    .zt31tn-footer-section h3 {
        font-size: 1.2rem;
        font-weight: 600;
        margin-bottom: 20px;
        color: #ecf0f1;
    }

    .zt31tn-footer-section ul {
        list-style: none;
    }

    .zt31tn-footer-section ul li {
        margin-bottom: 10px;
    }

    .zt31tn-footer-section ul li a {
        color: #bdc3c7;
        text-decoration: none;
        transition: color 0.3s;
    }

    .zt31tn-footer-section ul li a:hover {
        color: #3498db;
    }

    .zt31tn-footer-bottom {
        border-top: 1px solid #34495e;
        padding-top: 30px;
        text-align: center;
        color: #95a5a6;
    }

    @media (max-width: 768px) {
        .zt31tn-menu-toggle {
            display: flex;
        }

        .zt31tn-nav-menu {
            display: none;
            position: fixed;
            top: 70px;
            left: 0;
            right: 0;
            background: white;
            flex-direction: column;
            padding: 20px;
            box-shadow: 0 5px 20px rgba(0,0,0,0.1);
            gap: 0;
        }

        .zt31tn-nav-menu.active {
            display: flex;
        }

        .zt31tn-nav-menu a {
            padding: 15px 0;
            border-bottom: 1px solid #eee;
        }

        .zt31tn-faq-title {
            font-size: 2rem;
        }

        .zt31tn-faq-categories {
            grid-template-columns: 1fr;
            gap: 20px;
        }

        .zt31tn-category-card {
            padding: 20px;
        }

        .zt31tn-faq-question {
            padding: 20px;
            font-size: 1rem;
        }

        .zt31tn-faq-answer.active {
            padding: 20px;
        }

        .zt31tn-help-section {
            padding: 30px 20px;
            margin: 40px 0;
        }

        .zt31tn-help-buttons {
            flex-direction: column;
            align-items: center;
        }

        .zt31tn-help-btn {
            width: 100%;
            max-width: 300px;
            justify-content: center;
        }

        .zt31tn-footer-grid {
            grid-template-columns: 1fr;
            gap: 30px;
        }
    }

    @media (max-width: 480px) {
        .zt31tn-faq-content {
            padding: 40px 15px;
        }

        .zt31tn-faq-header-content {
            padding: 0 15px;
        }

        .zt31tn-search-input {
            font-size: 14px;
        }

        .zt31tn-category-icon {
            font-size: 2.5rem;
        }

        .zt31tn-help-title {
            font-size: 1.5rem;
        }
    }