/* 导航栏下拉菜单交互体验优化 */
/* 解决菜单选项难以点击的问题 */

/* ==================== 基础下拉菜单结构优化 ==================== */

/* 扩大整个下拉区域的点击范围 */
.dropdown {
    position: relative;
    padding: 0 0.5rem; /* 增加左右padding */
    margin: 0 0.25rem; /* 增加margin防止相邻菜单干扰 */
}

/* 下拉触发器优化 */
.dropdown-toggle {
    position: relative;
    padding: 0.4rem 0.8rem; /* 与导航栏样式保持一致 */
    cursor: pointer;
    user-select: none;
    /* 增加点击区域 */
    min-height: 44px; /* 符合移动端最佳实践 */
    display: flex;
    align-items: center;
}

/* 确保下拉菜单有足够的空间展开 */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    z-index: 1050;
    display: none;
    min-width: 220px;
    padding: 0.75rem 0;
    margin: 0.5rem 0 0;
    font-size: 0.95rem;
    color: #212529;
    text-align: left;
    list-style: none;
    background-color: #ffffff;
    background-clip: padding-box;
    border: 1px solid rgba(0, 0, 0, 0.15);
    border-radius: 0.5rem;
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.175);
    
    /* 关键优化：确保菜单完全可见 */
    min-height: 40px;
    overflow: visible;
}

.dropdown-menu.show {
    display: block;
    animation: dropdownSlideDown 0.25s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes dropdownSlideDown {
    0% {
        opacity: 0;
        transform: translateY(-10px) scale(0.95);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* ==================== 菜单项交互优化 ==================== */

/* 核心优化：增大菜单项的可点击区域 */
.dropdown-item {
    display: block;
    width: 100%;
    padding: 1rem 1.5rem; /* 增加垂直padding */
    clear: both;
    font-weight: 400;
    color: #212529;
    text-align: inherit;
    text-decoration: none;
    white-space: nowrap;
    background-color: transparent;
    border: 0;
    position: relative;
    transition: all 0.2s ease;
    cursor: pointer;
    user-select: none;
    
    /* 关键优化：最小点击区域 */
    min-height: 48px; /* 符合无障碍标准 */
    line-height: 1.5;
    
    /* 确保内容居中对齐 */
    display: flex;
    align-items: center;
}

/* 悬停状态优化 */
.dropdown-item:hover,
.dropdown-item:focus {
    color: #16181b;
    text-decoration: none;
    background-color: #f8f9fa;
    transform: translateX(8px);
    box-shadow: inset 4px 0 0 #667eea;
}

/* 焦点状态（键盘导航） */
.dropdown-item:focus {
    outline: 2px solid #667eea;
    outline-offset: -2px;
}

/* 激活状态 */
.dropdown-item:active {
    background-color: #e9ecef;
    transform: translateX(4px);
}

/* ==================== 图标和文本布局优化 ==================== */

/* 图标容器 */
.dropdown-item i {
    width: 24px; /* 增加图标宽度 */
    margin-right: 1rem;
    text-align: center;
    flex-shrink: 0;
    font-size: 1.1em;
    transition: transform 0.2s ease;
}

/* 文本内容 */
.dropdown-item .item-text {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 悬停时图标动画 */
.dropdown-item:hover i {
    transform: translateX(4px) scale(1.1);
}

/* ==================== 特殊菜单项优化 ==================== */

/* 分割线优化 */
.dropdown-divider {
    height: 0;
    margin: 0.75rem 1rem; /* 增加分割线上下间距 */
    overflow: hidden;
    border-top: 1px solid #e9ecef;
}

/* 禁用状态 */
.dropdown-item.disabled,
.dropdown-item:disabled {
    color: #6c757d;
    pointer-events: none;
    background-color: transparent;
    opacity: 0.65;
}

/* 活跃状态 */
.dropdown-item.active {
    color: #fff;
    text-decoration: none;
    background-color: #667eea;
    box-shadow: inset 4px 0 0 #4a5fc9;
}

/* ==================== 响应式优化 ==================== */

/* 平板设备 */
@media (max-width: 991.98px) {
    .dropdown-item {
        padding: 1.25rem 1.75rem;
        min-height: 56px;
        font-size: 1.1rem;
    }
    
    .dropdown-menu {
        min-width: 280px;
        box-shadow: 0 0.75rem 1.5rem rgba(0, 0, 0, 0.2);
    }
}

/* 移动设备 */
@media (max-width: 767.98px) {
    .dropdown-item {
        padding: 1.5rem 2rem;
        min-height: 60px;
        font-size: 1.15rem;
    }
    
    .dropdown-menu {
        min-width: 100vw;
        max-width: 100vw;
        left: 0 !important;
        right: 0 !important;
        border-radius: 0;
        margin: 0;
        box-shadow: 0 -0.25rem 0.5rem rgba(0, 0, 0, 0.1);
    }
    
    .dropdown-item i {
        width: 32px;
        font-size: 1.3em;
    }
}

/* ==================== 触摸设备优化 ==================== */

/* 检测触摸设备 */
@media (hover: none) and (pointer: coarse) {
    .dropdown-item {
        padding: 1.25rem 1.75rem;
        min-height: 56px; /* 更大的触摸目标 */
    }
    
    .dropdown-item:hover {
        /* 在触摸设备上禁用悬停效果 */
        transform: none;
        box-shadow: none;
    }
    
    .dropdown-item:active {
        background-color: #e9ecef;
        transform: scale(0.98);
    }
}

/* ==================== 防止意外关闭优化 ==================== */

/* 扩展下拉菜单的触发区域 */
.dropdown-extended-trigger {
    position: absolute;
    top: 0;
    bottom: 0;
    left: -20px; /* 向左扩展 */
    right: -20px; /* 向右扩展 */
    z-index: 1;
    pointer-events: none;
}

/* 确保菜单项不会被意外关闭 */
.dropdown-menu:hover {
    display: block !important;
}

/* ==================== 加载状态优化 ==================== */

.dropdown-item.loading {
    pointer-events: none;
    opacity: 0.7;
}

.dropdown-item.loading::after {
    content: '';
    position: absolute;
    right: 1.5rem;
    top: 50%;
    width: 16px;
    height: 16px;
    margin-top: -8px;
    border: 2px solid #e9ecef;
    border-top-color: #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ==================== 键盘导航优化 ==================== */

.dropdown-item[tabindex]:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
    background-color: #e8ebff;
}

/* ==================== 性能优化 ==================== */

/* 使用transform代替改变布局属性 */
.dropdown-item {
    will-change: transform, background-color;
}

/* 启用硬件加速 */
.dropdown-menu {
    transform: translateZ(0);
    backface-visibility: hidden;
}

/* 减少重绘 */
.dropdown-item:hover {
    will-change: transform;
}

/* ==================== 可访问性修复 ==================== */

/* 修复aria-hidden可访问性问题 */
.dropdown-menu[aria-hidden="true"] {
    display: none !important;
}

.dropdown-menu[aria-hidden="false"] {
    display: block !important;
}

/* 当菜单隐藏时，确保内部元素不可聚焦 */
.dropdown-menu[aria-hidden="true"] .dropdown-item {
    visibility: hidden;
    pointer-events: none;
    tab-index: -1;
}

/* 确保显示状态下的菜单项可正常访问 */
.dropdown-menu[aria-hidden="false"] .dropdown-item {
    visibility: visible;
    pointer-events: auto;
    tab-index: 0;
}