.zing-customer-service {
    position: fixed;
    right: 20px;
    bottom: 100px;
    z-index: 9999;
}

.cs-toggle {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

.cs-toggle:hover {
    transform: scale(1.1);
}

.cs-toggle i {
    color: #fff;
    font-size: 24px;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.cs-panel {
    position: absolute;
    right: 0;
    bottom: 60px;
    width: 280px;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
}

.cs-panel.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.cs-header {
    padding: 15px 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.cs-close {
    cursor: pointer;
    font-size: 18px;
}

.cs-body {
    padding: 10px;
}

.cs-item {
    display: flex;
    align-items: center;
    padding: 12px 15px;
    color: var(--text-color);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: var(--transition);
    position: relative;
}

.cs-item:hover {
    background: var(--bg-light);
    color: var(--primary-color);
}

.cs-item i {
    font-size: 24px;
    margin-right: 12px;
    width: 30px;
    text-align: center;
}

.cs-item small {
    display: block;
    font-size: 12px;
    color: var(--text-muted);
}

.cs-weixin .weixin-qrcode {
    position: absolute;
    right: 100%;
    top: 0;
    margin-right: 15px;
    background: var(--bg-white);
    padding: 15px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.cs-weixin:hover .weixin-qrcode {
    opacity: 1;
    visibility: visible;
}

.cs-weixin .weixin-qrcode img {
    width: 150px;
    height: auto;
}

.cs-weixin .weixin-qrcode p {
    margin: 10px 0 0;
    text-align: center;
    font-size: 12px;
    color: var(--text-muted);
}

.zing-contact-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 99999;
    display: none;
    align-items: center;
    justify-content: center;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
}

.modal-content {
    position: relative;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    margin: 0;
    font-size: 18px;
}

.modal-close {
    cursor: pointer;
    font-size: 24px;
    color: var(--text-muted);
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--danger-color);
}

.modal-body {
    padding: 20px;
}

.zing-contact-form .form-group {
    margin-bottom: 15px;
}

.zing-contact-form label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: var(--text-color);
}

.zing-contact-form input,
.zing-contact-form select,
.zing-contact-form textarea {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    transition: var(--transition);
}

.zing-contact-form input:focus,
.zing-contact-form select:focus,
.zing-contact-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(30,115,190,0.1);
}

.zing-contact-form .btn {
    width: 100%;
    padding: 12px 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    cursor: pointer;
    transition: var(--transition);
}

.zing-contact-form .btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.form-message {
    margin-top: 15px;
    padding: 10px;
    border-radius: var(--radius-md);
    text-align: center;
}

.form-message .success {
    color: var(--success-color);
    background: rgba(40,167,69,0.1);
}

.form-message .error {
    color: var(--danger-color);
    background: rgba(220,53,69,0.1);
}

.zing-case-filter {
    margin: 30px 0;
}

.filter-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
}

.filter-tab {
    padding: 10px 20px;
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    font-size: 14px;
}

.filter-tab:hover,
.filter-tab.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.case-item {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.case-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.case-item a {
    display: block;
    text-decoration: none;
    color: inherit;
}

.case-thumb {
    position: relative;
    padding-top: 66.67%;
    overflow: hidden;
}

.case-thumb img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.case-item:hover .case-thumb img {
    transform: scale(1.1);
}

.case-info {
    padding: 15px;
}

.case-info h3 {
    font-size: 16px;
    margin: 0 0 5px;
    color: var(--text-color);
}

.case-date {
    font-size: 12px;
    color: var(--text-muted);
}

.back-to-top {
    position: fixed;
    right: 20px;
    bottom: 30px;
    width: 45px;
    height: 45px;
    background: var(--primary-color);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 9998;
    box-shadow: var(--shadow-md);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--secondary-color);
    transform: translateY(-3px);
}

.smart-toc {
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    padding: 20px;
    margin-bottom: 30px;
    border-left: 4px solid var(--primary-color);
}

.toc-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.toc-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.toc-list li {
    margin-bottom: 8px;
}

.toc-list a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
    display: block;
    padding: 5px 0;
}

.toc-list a:hover {
    color: var(--primary-color);
    padding-left: 10px;
}

.toc-level-2 { padding-left: 0; }
.toc-level-3 { padding-left: 15px; }
.toc-level-4 { padding-left: 30px; }

.smart-related-posts {
    margin-top: 40px;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
}

.related-title {
    font-size: 20px;
    margin-bottom: 20px;
    color: var(--text-color);
}

.related-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.related-item {
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

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

.related-link {
    display: flex;
    gap: 15px;
    text-decoration: none;
    color: inherit;
}

.related-thumb {
    width: 80px;
    height: 60px;
    flex-shrink: 0;
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.related-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.related-content h4 {
    font-size: 14px;
    margin: 0 0 5px;
    color: var(--text-color);
    transition: var(--transition);
}

.related-link:hover h4 {
    color: var(--primary-color);
}

.related-date {
    font-size: 12px;
    color: var(--text-muted);
}

.article-stats {
    display: flex;
    gap: 20px;
    padding: 10px 15px;
    background: var(--bg-light);
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    font-size: 13px;
    color: var(--text-muted);
}

.article-stats span {
    display: flex;
    align-items: center;
    gap: 5px;
}

@media (max-width: 768px) {
    .zing-customer-service {
        right: 10px;
        bottom: 80px;
    }
    
    .cs-toggle {
        width: 45px;
        height: 45px;
    }
    
    .cs-panel {
        width: 260px;
        right: -5px;
    }
    
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    .filter-tabs {
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 10px;
    }
    
    .filter-tab {
        white-space: nowrap;
        flex-shrink: 0;
    }
}

@media (max-width: 480px) {
    .cases-grid {
        grid-template-columns: 1fr;
    }
}