.custom-nested-tabs {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 30px auto;
    padding: 15px;
    background: #f8f8f8;
    border-radius: 15px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
    width: 80%;
}

.custom-nested-tabs .tabs-nav {
    display: flex;
    justify-content: center;
    margin: 0;
    padding: 0;
    background: transparent;
}

.custom-nested-tabs .tabs-nav li {
    display: inline-block;
    padding: 14px 30px;
    margin: 0 5px;
    cursor: pointer;
    font-size: 16px;
    text-transform: uppercase;
    letter-spacing: 1px;
    background: #e0e0e0;
    border-radius: 30px;
    transition: background 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

.custom-nested-tabs .tabs-nav li:hover {
    background: #6200ea;
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.custom-nested-tabs .tabs-nav li.active {
    background: #6200ea;
    color: white;
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
}

.custom-nested-tabs .tabs-content {
    padding: 30px;
    background: #fff;
    border-radius: 15px;
    margin-top: 20px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
    animation: fadeIn 0.5s ease-in-out;
}

.custom-nested-tabs .tabs-content .tab-content {
    display: none;
    padding: 20px;
    background: #f9f9f9;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.custom-nested-tabs .tabs-content .tab-content:first-of-type {
    display: block;
}

@keyframes fadeIn {
    0% { opacity: 0; }
    100% { opacity: 1; }
}