/**
 * 用户菜单样式 (User Menu Styles)
 * 作用: 替代内联样式，提升可维护性和性能
 * 版本: 1.0.0
 * 日期: 2026-01-23
 */

/* ===== 用户菜单触发器 ===== */
.user-menu-trigger {
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
    transition: background 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.user-menu-trigger:hover {
    background: #f3f4f6;
}

.user-menu-trigger:active {
    background: #e5e7eb;
}

/* ===== 用户头像 ===== */
.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
    line-height: 1;
    transition: opacity 0.3s ease, transform 0.2s ease;
    user-select: none;
}

.user-avatar:hover {
    transform: scale(1.05);
}

/* ===== 登录按钮 ===== */
.login-button {
    padding: 0.5rem 1rem;
    background: #8b5cf6;
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.1s ease;
    font-size: 0.875rem;
    line-height: 1;
    white-space: nowrap;
}

.login-button:hover {
    background: #7c3aed;
    transform: translateY(-1px);
}

.login-button:active {
    background: #6d28d9;
    transform: translateY(0);
}

/* ===== 移动端侧边栏 ===== */
#mobile-sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 9999;
    opacity: 0;
    transition: opacity 0.3s ease;
}

#mobile-sidebar-overlay.active {
    display: block;
    opacity: 1;
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    .user-menu-trigger {
        padding: 0.375rem;
    }
    
    .user-avatar {
        width: 28px;
        height: 28px;
        font-size: 0.8125rem;
    }
    
    .login-button {
        padding: 0.375rem 0.875rem;
        font-size: 0.8125rem;
    }
}

/* ===== 深色模式支持 ===== */
@media (prefers-color-scheme: dark) {
    .user-menu-trigger:hover {
        background: rgba(255, 255, 255, 0.1);
    }
    
    .user-menu-trigger:active {
        background: rgba(255, 255, 255, 0.15);
    }
}

/* ===== 可访问性 ===== */
.user-menu-trigger:focus,
.login-button:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

.user-menu-trigger:focus:not(:focus-visible),
.login-button:focus:not(:focus-visible) {
    outline: none;
}

/* ===== 加载状态 ===== */
.user-avatar.loading {
    opacity: 0.5;
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 0.5;
    }
    50% {
        opacity: 0.8;
    }
}