body.theme-modern {
    background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
    min-height: 100vh;
    color: #f8f9fa;
}

.theme-modern .navbar {
    background: rgba(15, 32, 39, 0.85);
    backdrop-filter: blur(6px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.theme-modern .navbar .nav-link.active {
    font-weight: 600;
}

.theme-modern .card {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: 0 24px 50px rgba(0, 0, 0, 0.35);
    color: #f8f9fa;
    border-radius: 24px;
}

.theme-modern .list-group-item {
    background: rgba(255, 255, 255, 0.08);
    color: #f8f9fa;
    border: none;
    border-radius: 18px;
    margin-bottom: 12px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.theme-modern .list-group-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 25px rgba(0, 0, 0, 0.25);
}

.theme-modern .list-group-item.active {
    background: linear-gradient(135deg, #7f7fd5, #86a8e7, #91eae4);
    border-color: transparent;
    color: #0b1720;
    font-weight: 600;
}

.theme-modern .btn-primary {
    background: linear-gradient(135deg, #12c2e9, #c471ed);
    border: none;
}

.theme-modern .btn-outline-primary {
    color: #12c2e9;
    border-color: #12c2e9;
}

.theme-modern .btn-outline-primary:hover,
.theme-modern .btn-outline-primary:focus {
    background: #12c2e9;
    color: #0b1720;
}

.theme-modern .table {
    color: #f8f9fa;
    border-color: rgba(255, 255, 255, 0.12);
}

.theme-modern .table thead {
    background: rgba(255, 255, 255, 0.12);
    color: #f8f9fa;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.85rem;
}

.theme-modern .table-striped > tbody > tr:nth-of-type(odd) {
    background-color: rgba(255, 255, 255, 0.05);
}

.theme-modern .table-striped > tbody > tr:hover {
    background: rgba(18, 194, 233, 0.1);
}

.theme-modern .form-control,
.theme-modern .form-select {
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #f8f9fa;
}

.theme-modern .table .form-control {
    background-color: rgba(255, 255, 255, 0.9);
    color: #0b1720;
}

.theme-modern .form-control:focus,
.theme-modern .form-select:focus {
    border-color: #12c2e9;
    box-shadow: 0 0 0 0.2rem rgba(18, 194, 233, 0.25);
}

.theme-modern .modal-content {
    background: rgba(15, 32, 39, 0.95);
    color: #f8f9fa;
}

.theme-modern .table-responsive,
.theme-modern .list-group,
.theme-modern .card-body,
.theme-modern .card-header {
    border-radius: 16px;
}
.theme-modern .theme-tracker-list .list-group-item {
    display: block;
    padding: 1rem 1.25rem;
    border-radius: 18px;
    margin-bottom: 10px;
}

.theme-modern .theme-tracker-list .list-group-item .fw-semibold {
    font-size: 1rem;
    font-weight: 700;
}

.theme-modern .theme-tracker-list .list-group-item small {
    opacity: 0.85;
}

.theme-modern .tracker-last-seen {
    color: #1f1f1f;
}