/* ── DAD 品牌标识 ───────────────────────────────────────────── */

.brand-mark {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(145deg, #1a56db 0%, #2563eb 42%, #0ea5e9 100%);
    color: #fff;
    font-weight: 800;
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    letter-spacing: 0.08em;
    line-height: 1;
    text-indent: 0.08em;
    box-shadow: 0 4px 14px rgba(26, 86, 219, 0.32);
    user-select: none;
}

.brand-mark--sm {
    width: 28px;
    height: 28px;
    font-size: 0.5rem;
    border-radius: 7px;
    letter-spacing: 0.06em;
    text-indent: 0.06em;
}

.brand-mark--md {
    width: 36px;
    height: 36px;
    font-size: 0.625rem;
    border-radius: 10px;
}

.brand-mark--lg {
    width: 44px;
    height: 44px;
    font-size: 0.75rem;
    border-radius: 12px;
}

.brand-logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.brand-name {
    font-weight: 700;
    letter-spacing: -0.02em;
}

/* 深色底（页脚等） */
.footer-brand .brand-mark {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
}