/**
 * 前台独有：站点头部、导航、页脚
 * 依赖：design-tokens.css, base.css, layout.css, components.css
 */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.site-header .logo {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
}

.site-header .logo:hover { text-decoration: none; }

.nav-desktop {
    display: flex;
    align-items: center;
    gap: var(--space-6);
}

.nav-desktop a {
    color: var(--color-text);
    text-decoration: none;
}

.nav-desktop a:hover { color: var(--color-primary); }

.nav-toggle {
    display: none;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 0;
    background: transparent;
    cursor: pointer;
    font-size: 1.25rem;
}

@media (max-width: 767px) {
    .nav-desktop { display: none; }
    .nav-toggle { display: flex; align-items: center; justify-content: center; }
}

.nav-mobile {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-2);
}

.nav-mobile.show { display: block; }

.nav-mobile a {
    display: block;
    padding: var(--space-3) var(--space-4);
    color: var(--color-text);
    text-decoration: none;
    min-height: 44px;
    line-height: 44px;
    padding-top: 0;
    padding-bottom: 0;
}

.nav-mobile a:hover { background: var(--color-bg-page); color: var(--color-primary); }

.site-footer {
    padding: var(--space-6) var(--space-4);
    text-align: center;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    border-top: 1px solid var(--color-border);
}

.site-footer a { color: var(--color-text-secondary); }

/* ---------- 用户菜单下拉 ---------- */
.user-menu {
    position: relative;
    display: flex;
    align-items: center;
}

.user-menu-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    padding: 6px 12px;
    border-radius: var(--radius);
    color: var(--color-text);
    transition: background .2s;
    user-select: none;
    font-weight: 500;
}

.user-menu-btn:hover {
    background: var(--color-bg-page);
    color: var(--color-primary);
}

.user-menu .dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 6px;
    min-width: 160px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    z-index: 1100;
    overflow: hidden;
}

.user-menu .dropdown-menu.show { display: block; }

.user-menu .dropdown-menu a {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    color: var(--color-text);
    text-decoration: none;
    font-size: var(--font-size);
    transition: background .15s;
}

.user-menu .dropdown-menu a:hover {
    background: var(--color-bg-page);
    color: var(--color-primary);
    text-decoration: none;
}