html, body {
    height: 100%;
}

body {
    margin: 0;
    background: #f8f9fa;
}

.site-shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 1030;
}

.site-main {
    flex: 1 0 auto;
}

.site-footer {
    margin-top: auto;
}

.auth-card {
    max-width: 460px;
    margin: 0 auto;
}

.code-display {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}