body {
    background-color: #f8f9fa;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}
main {
    flex: 1;
}
.navbar {
    background-color: #004488; /* Dark blue */
}
.navbar-brand {
    font-weight: bold;
    color: #fff !important;
}
.footer {
    background-color: #343a40;
    color: #ccc;
    padding: 2rem 0;
    font-size: 0.9em;
}
.footer a {
    color: #fff;
    text-decoration: none;
}
.footer a:hover {
    text-decoration: underline;
}

/* Tabbed interface styles */
.nav-tabs {
    border-bottom: 1px solid #dee2e6;
}
.nav-tabs .nav-link {
    color: #004488;
}
.nav-tabs .nav-link.active {
    font-weight: bold;
    color: #0d6efd;
    background-color: #fff;
    border-color: #dee2e6 #dee2e6 #fff;
}
.tab-content > .card {
    border-top-left-radius: 0;
}

/* Result field styling */
.result-group .form-control {
    background-color: #e9ecef;
    font-family: monospace;
    font-size: 1.1em;
}

.result-group .btn-copy .fa-check {
    color: green;
}

/* Loading spinner inside buttons */
.btn .spinner-border {
    margin-right: 0.5rem;
}