/* ==================== 导航栏国际化布局优化 ==================== */

/* 导航栏基础布局优化 */
.navbar {
    position: relative;
    z-index: 1030;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.navbar .container {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* 品牌标识优化 */
.navbar-brand {
    display: flex;
    align-items: center;
    flex-shrink: 0;
    margin-right: 2rem;
    font-weight: 600;
    font-size: 1.25rem;
    text-decoration: none;
    color: var(--dark-color);
}

.navbar-brand:hover {
    color: var(--primary-color);
    text-decoration: none;
}

.navbar-brand img {
    margin-right: 0.5rem;
}

/* 导航菜单容器优化 */
.navbar-collapse {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* 主导航菜单优化 */
.navbar-nav.me-auto {
    display: flex;
    align-items: center;
    flex-wrap: nowrap;
    gap: 0.25rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

/* 导航项优化 */
.navbar-nav .nav-item {
    position: relative;
    flex-shrink: 0;
}

/* 导航链接优化 - 解决英文文字过长问题 */
.navbar-nav .nav-link {
    display: flex;
    align-items: center;
    padding: 0.5rem 0.75rem;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--dark-color);
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: var(--transition);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 130px;
    min-width: 80px;
}

.navbar-nav .nav-link:hover {
    color: var(--primary-color);
    background-color: rgba(13, 110, 253, 0.1);
}

.navbar-nav .nav-link i {
    margin-right: 0.25rem;
    flex-shrink: 0;
    width: 16px;
    text-align: center;
}

.navbar-nav .nav-link span {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* 下拉菜单优化 */
.navbar-nav .dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    z-index: 1000;
    display: none;
    min-width: 200px;
    max-width: 280px;
    padding: 0.5rem 0;
    margin: 0.125rem 0 0;
    font-size: 0.875rem;
    color: var(--dark-color);
    text-align: left;
    list-style: none;
    background-color: var(--white-color);
    background-clip: padding-box;
    border: 1px solid rgba(0, 0, 0, 0.15);
    border-radius: var(--border-radius);
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}

.navbar-nav .dropdown-menu.show {
    display: block;
}

.navbar-nav .dropdown-item {
    display: block;
    width: 100%;
    padding: 0.5rem 1rem;
    clear: both;
    font-weight: 400;
    color: var(--dark-color);
    text-align: inherit;
    text-decoration: none;
    white-space: nowrap;
    background-color: transparent;
    border: 0;
    transition: var(--transition);
}

.navbar-nav .dropdown-item:hover,
.navbar-nav .dropdown-item:focus {
    color: var(--dark-color);
    text-decoration: none;
    background-color: var(--light-color);
}

.navbar-nav .dropdown-item i {
    margin-right: 0.5rem;
    width: 16px;
    text-align: center;
}

/* 右侧导航菜单优化 */
.navbar-nav:not(.me-auto) {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: auto;
}

/* 语言切换按钮优化 */
.navbar-nav .nav-item:last-child {
    margin-left: 0;
}

.navbar-nav .btn-link {
    padding: 0.5rem;
    color: var(--dark-color);
    text-decoration: none;
    border: none;
    background: none;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.navbar-nav .btn-link:hover {
    color: var(--primary-color);
    background-color: rgba(13, 110, 253, 0.1);
}

/* 移动端导航栏优化 */
@media (max-width: 991.98px) {
    .navbar-collapse {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--white-color);
        border-top: 1px solid rgba(0, 0, 0, 0.1);
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        max-height: 80vh;
        overflow-y: auto;
    }
    
    .navbar-nav.me-auto {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        margin: 0;
        padding: 1rem 0;
    }
    
    .navbar-nav .nav-item {
        width: 100%;
    }
    
    .navbar-nav .nav-link {
        max-width: none;
        padding: 0.75rem 1rem;
        border-radius: 0;
        border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    }
    
    .navbar-nav .dropdown-menu {
        position: static;
        float: none;
        width: 100%;
        max-width: none;
        margin: 0;
        padding: 0;
        border: none;
        box-shadow: none;
        background-color: rgba(0, 0, 0, 0.02);
    }
    
    .navbar-nav .dropdown-item {
        padding: 0.5rem 2rem;
        border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    }
    
    .navbar-nav .dropdown-item:last-child {
        border-bottom: none;
    }
}

/* 小屏幕设备优化 */
@media (max-width: 575.98px) {
    .navbar .container {
        padding: 0 0.5rem;
    }
    
    .navbar-brand {
        font-size: 1.1rem;
        margin-right: 1rem;
    }
    
    .navbar-brand img {
        width: 28px;
        height: 28px;
    }
}

/* 导航栏响应式断点优化 */
@media (min-width: 992px) {
    .navbar-nav .nav-link {
        max-width: 120px;
    }
    
    .navbar-nav .dropdown-toggle {
        max-width: 140px;
    }
}

@media (min-width: 1200px) {
    .navbar-nav .nav-link {
        max-width: 130px;
    }
    
    .navbar-nav .dropdown-toggle {
        max-width: 150px;
    }
}

/* 导航栏动画优化 */
.navbar-nav .nav-link {
    transition: all 0.2s ease-in-out;
}

.navbar-nav .dropdown-menu {
    transition: opacity 0.15s ease-in-out, transform 0.15s ease-in-out;
    transform-origin: top;
}

.navbar-nav .dropdown-menu.show {
    opacity: 1;
    transform: scaleY(1);
}

.navbar-nav .dropdown-menu:not(.show) {
    opacity: 0;
    transform: scaleY(0);
}

/* 导航栏焦点状态优化 */
.navbar-nav .nav-link:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.navbar-nav .dropdown-item:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: -2px;
}

/* 导航栏无障碍优化 */
@media (prefers-reduced-motion: reduce) {
    .navbar-nav .nav-link,
    .navbar-nav .dropdown-menu {
        transition: none;
    }
}

/* 导航栏高对比度模式支持 */
@media (prefers-contrast: high) {
    .navbar-nav .nav-link {
        border: 1px solid transparent;
    }
    
    .navbar-nav .nav-link:hover {
        border-color: var(--dark-color);
    }
    
    .navbar-nav .dropdown-menu {
        border: 2px solid var(--dark-color);
    }
}

/* 深色模式适配 */
[data-theme="dark"] .navbar {
    background-color: var(--dark-color);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .navbar-nav .nav-link {
    color: var(--light-color);
}

[data-theme="dark"] .navbar-nav .nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .navbar-nav .dropdown-menu {
    background-color: var(--dark-color);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .navbar-nav .dropdown-item {
    color: var(--light-color);
}

[data-theme="dark"] .navbar-nav .dropdown-item:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .navbar-nav .btn-link {
    color: var(--light-color);
}

[data-theme="dark"] .navbar-nav .btn-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* 调试工具类 */
.navbar-debug {
    border: 1px solid red;
}

.navbar-debug .nav-link {
    border: 1px solid blue;
}

.navbar-debug .dropdown-menu {
    border: 1px solid green;
}

/* 语言特定样式 */
[lang="en"] .navbar-nav .nav-link {
    font-size: 0.85rem;
}

[lang="zh-CN"] .navbar-nav .nav-link {
    font-size: 0.9rem;
}