:root {
    --brand: #0d6efd;
    --bg: #ffffff;
    --text: #222;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
}

.site-logo {
    opacity: 0;
    transition: opacity 160ms ease;
}

html[data-theme] .site-logo {
    opacity: 1;
}

.site-header,
.header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 1rem;
    background: var(--brand);
    color: #fff;
}

.site-logo img {
    height: 36px;
    width: auto;
    display: block;
}

.btn-primary {
    background: var(--brand);
    color: #fff;
    border: 0;
    padding: 0.5rem 0.875rem;
    border-radius: 8px;
}