/* 导航样式 - 前后台通用 */

/* 导航容器 */
.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    height: 60px;
}

/* 导航品牌 */
.nav-logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--color-text);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* 导航菜单 */
.nav-menu {
    display: flex;
    align-items: center;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 1px;
}

/* 导航项 */
.nav-menu > li {
    position: relative;
}

/* 导航链接 */
.nav-link {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    color: var(--color-text);
    text-decoration: none;
    transition: all 0.3s ease;
    border-radius: 4px;
    font-size: 0.95rem;
}

.nav-link:hover {
    background-color: var(--color-bg-secondary);
    color: var(--color-primary);
}

/* 当前激活项 */
.nav-item-active {
    position: relative;
}

.nav-item-active .nav-link {
    color: var(--color-primary);
    font-weight: 500;
}

.nav-item-active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background-color: var(--color-primary);
    border-radius: 1px;
}

/* 导航图标 */
.nav-icon {
    margin-right: 8px;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
}

/* 下拉菜单 */
.nav-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 180px;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    list-style: none;
    margin: 4px 0 0;
    padding: 8px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1000;
}

.nav-menu > li:hover .nav-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-dropdown li {
    width: 100%;
}

.nav-dropdown .nav-link {
    padding: 10px 16px;
    white-space: nowrap;
    border-radius: 0;
}

.nav-dropdown .nav-link:hover {
    background-color: var(--color-bg-secondary);
}

/* 下拉菜单切换按钮 */
.nav-dropdown-toggle {
    background: none;
    border: none;
    color: var(--color-text);
    cursor: pointer;
    padding: 0 8px;
    margin-left: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease;
}

.nav-menu > li:hover .nav-dropdown-toggle {
    transform: rotate(180deg);
}

/* 下拉菜单图标 */
.nav-dropdown-icon {
    display: inline-block;
    width: 6px;
    height: 6px;
    border-left: 1px solid currentColor;
    border-bottom: 1px solid currentColor;
    transform: rotate(-45deg);
    transition: transform 0.3s ease;
}

/* 导航切换按钮（移动端） */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-text);
    cursor: pointer;
    padding: 8px;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

.nav-toggle:hover {
    background-color: var(--color-bg-secondary);
}

.nav-toggle-icon {
    display: block;
    width: 24px;
    height: 2px;
    background-color: currentColor;
    position: relative;
    transition: all 0.3s ease;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background-color: currentColor;
    transition: all 0.3s ease;
}

.nav-toggle-icon::before {
    top: -8px;
}

.nav-toggle-icon::after {
    bottom: -8px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon {
    background-color: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
    transform: rotate(45deg);
    top: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
    transform: rotate(-45deg);
    bottom: 0;
}

/* 后台导航特殊样式 */
.admin-nav {
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.admin-nav .nav-menu {
    gap: 0;
}

.admin-nav .nav-link {
    border-radius: 0;
    border-right: 1px solid var(--color-border);
}

.admin-nav .nav-item-logout {
    margin-left: auto;
}

.admin-nav .nav-item-logout .nav-link {
    color: var(--color-danger);
    border-left: 1px solid var(--color-border);
    border-right: none;
}

.admin-nav .nav-item-logout .nav-link:hover {
    background-color: var(--color-danger-light);
}

/* 响应式设计 */
@media (max-width: 768px) {
    /* 移动端导航容器 */
    .nav-container {
        position: relative;
    }
    
    /* 显示导航切换按钮 */
    .nav-toggle {
        display: block;
    }
    
    /* 移动端菜单 */
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: var(--color-bg);
        border: 1px solid var(--color-border);
        border-top: none;
        border-radius: 0 0 4px 4px;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        padding: 8px 0;
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: all 0.3s ease;
        z-index: 999;
    }
    
    .nav-menu.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
    
    /* 移动端导航项 */
    .nav-menu > li {
        width: 100%;
        border-bottom: 1px solid var(--color-border-light);
    }
    
    .nav-menu > li:last-child {
        border-bottom: none;
    }
    
    .nav-link {
        justify-content: space-between;
        padding: 12px 20px;
        border-radius: 0;
    }
    
    /* 移动端下拉菜单 */
    .nav-dropdown {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        border: none;
        border-radius: 0;
        box-shadow: none;
        padding: 0;
        margin: 0;
        display: none;
    }
    
    .nav-menu > li:hover .nav-dropdown {
        display: none;
    }
    
    .nav-menu > li.show-dropdown .nav-dropdown {
        display: block;
    }
    
    .nav-dropdown .nav-link {
        padding-left: 40px;
        background-color: var(--color-bg-secondary);
    }
    
    /* 移动端后台导航 */
    .admin-nav .nav-menu {
        gap: 0;
    }
    
    .admin-nav .nav-item-logout {
        margin-left: 0;
        border-top: 1px solid var(--color-border);
    }
    
    .admin-nav .nav-item-logout .nav-link {
        border-left: none;
    }
}

/* 无障碍支持 */
@media (prefers-reduced-motion: reduce) {
    .nav-link,
    .nav-dropdown,
    .nav-toggle-icon,
    .nav-dropdown-toggle,
    .nav-dropdown-icon {
        transition: none;
    }
}

/* 键盘导航支持 */
.nav-link:focus,
.nav-toggle:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    .nav-link {
        border: 1px solid transparent;
    }
    
    .nav-link:hover {
        border-color: var(--color-text);
    }
}