:root {
    --dsu-primary: #17365d;
    --dsu-primary-hover: #102744;
    --dsu-background: #f4f7fb;
    --dsu-border: #dce3ec;
}

body {
    margin: 0;
    background: var(--dsu-background);
    color: #263449;
    font-family: Arial, Helvetica, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

.site-header,
.site-footer {
    background: #0d539e;
    color: #fff;
}

.brand-logo {
    width: 52px;
    height: 52px;
    display: grid;
    place-items: center;
    border: 2px solid #fff;
    border-radius: 10px;
    font-weight: 700;
    letter-spacing: 1px;
}

.site-header h1 {
    font-weight: 700;
}

.site-footer {
    font-size: 14px;
}

.footer-credit {
    font-weight: 600;
}

.btn-primary {
    background-color: var(--dsu-primary);
    border-color: var(--dsu-primary);
}

.btn-primary:hover,
.btn-primary:focus {
    background-color: var(--dsu-primary-hover);
    border-color: var(--dsu-primary-hover);
}

.card {
    border: 1px solid var(--dsu-border);
    border-radius: 12px;
}

.form-control,
.form-select {
    min-height: 42px;
}

@media (max-width: 576px) {
    .site-header .container {
        padding-left: 16px;
        padding-right: 16px;
    }

    .footer-credit {
        display: block;
        margin-top: 5px;
    }
}