/* 中安信科技 · 品牌 Logo（反白版，已裁剪透明底） */
.zax-brand {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: inherit;
}

a.zax-brand:hover {
    text-decoration: none;
    opacity: 0.92;
}

.zax-brand-img {
    display: block;
    width: auto;
    max-width: 100%;
    object-fit: contain;
    flex-shrink: 0;
}

.zax-brand--sm .zax-brand-img {
    height: 2.125rem;
}

.zax-brand--md .zax-brand-img {
    height: 2.625rem;
}

.zax-brand--lg .zax-brand-img {
    height: auto;
    width: min(100%, 26rem);
    max-height: 4.75rem;
}

.zax-brand-platform {
    font-size: 0.875rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
    letter-spacing: 0.04em;
    white-space: nowrap;
    padding-left: 0.75rem;
    border-left: 1px solid rgba(255, 255, 255, 0.25);
    line-height: 1.2;
}

.zax-brand--stack {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.875rem;
}

.zax-brand--stack .zax-brand-platform {
    padding-left: 0;
    border-left: none;
    font-size: 1.0625rem;
    color: #fff;
    font-weight: 600;
    letter-spacing: 0.08em;
}

.zax-brand--stack .zax-brand-tagline {
    margin-top: 0;
}

.zax-brand-tagline {
    margin: 0;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.68);
    line-height: 1.55;
    max-width: 26rem;
}

/* 学生端导航 */
.student-navbar .navbar-brand {
    padding-top: 0.375rem;
    padding-bottom: 0.375rem;
    margin-right: 1.25rem;
}

.student-navbar .zax-brand {
    gap: 0;
}

.student-navbar .zax-brand--sm .zax-brand-img {
    height: 1.75rem;
    max-width: 9rem;
}

/* 管理后台侧边栏 */
.sidebar-header .zax-brand {
    width: 100%;
}

.sidebar-header .zax-brand--md .zax-brand-img {
    height: 2.125rem;
    max-width: 10.5rem;
}

.sidebar-header .zax-brand-platform {
    font-size: 0.75rem;
    flex-shrink: 0;
}

/* 登录页顶部 Logo */
.login-header .zax-brand--stack {
    align-items: center;
}

.login-header .zax-brand-img {
    height: auto;
    width: min(100%, 18rem);
    max-height: 3.25rem;
}

.login-header .zax-brand-tagline {
    text-align: center;
    max-width: 20rem;
}

@media (max-width: 768px) {
    .login-header .zax-brand-img {
        width: min(100%, 15rem);
        max-height: 2.75rem;
    }

    .student-navbar .zax-brand--sm .zax-brand-img {
        height: 1.625rem;
        max-width: 8rem;
    }
}