/* 底部导航栏通用样式 */
:root {
    --bottom-nav-height: 60px;
    --bottom-nav-icon-size: 24px;
    --bottom-nav-bg: rgba(18, 18, 18, 0.85);
    --bottom-nav-blur: 10px;
    --bottom-nav-item-width: 72px;
    --gradient-width: 32px;
}

/* 默认隐藏底部导航栏 */
.bottom-nav {
    display: none;
}

/* 媒体查询：移动设备 */
@media (max-width: 768px) {
    /* 底部空间，为底部导航栏腾出空间 */
    body {
        padding-bottom: calc(var(--bottom-nav-height) + env(safe-area-inset-bottom));
    }
    
    /* 显示底部导航栏 */
    .bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        min-height: var(--bottom-nav-height);
        background-color: var(--bottom-nav-bg);
        backdrop-filter: blur(var(--bottom-nav-blur));
        -webkit-backdrop-filter: blur(var(--bottom-nav-blur));
        z-index: 1000;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        padding-bottom: env(safe-area-inset-bottom);
    }

    /* 滑动容器样式 */
    .bottom-nav-scroll {
        display: flex;
        overflow-x: auto;
        scroll-behavior: smooth;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        -ms-overflow-style: none;
        padding: 0 16px;
        position: relative;
        width: 100%;
    }

    .bottom-nav-scroll::-webkit-scrollbar {
        display: none;
    }
    
    .bottom-nav-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        color: var(--dark-text-secondary);
        text-decoration: none;
        min-width: var(--bottom-nav-item-width);
        height: 100%;
        transition: all 0.3s ease;
        padding: 8px 0;
        flex-shrink: 0;
    }
    
    /* 右侧渐变提示 */
    .nav-gradient-right {
        position: absolute;
        right: 0;
        top: 0;
        width: var(--gradient-width);
        height: 100%;
        background: linear-gradient(to right, transparent, var(--bottom-nav-bg));
        pointer-events: none;
        z-index: 2;
    }
    
    .bottom-nav-icon {
        font-size: var(--bottom-nav-icon-size);
        margin-bottom: 4px;
    }
    
    .bottom-nav-text {
        font-size: 12px;
        font-weight: 500;
        white-space: nowrap;
    }
    
    /* 底部导航栏动画效果 */
    .bottom-nav-item:active {
        transform: scale(0.95);
    }

    /* 底部导航栏选中状态 */
    .bottom-nav-item.active {
        color: var(--dark-primary);
        position: relative;
    }

    .bottom-nav-item.active::after {
        content: '';
        position: absolute;
        bottom: -2px;
        left: 50%;
        transform: translateX(-50%);
        width: 4px;
        height: 4px;
        background-color: var(--dark-primary);
        border-radius: 50%;
        box-shadow: 0 0 8px var(--dark-primary);
    }

    .bottom-nav-item.active .bottom-nav-icon {
        transform: scale(1.1);
        transition: transform 0.2s ease;
    }

    .bottom-nav-item.active .bottom-nav-text {
        font-weight: 600;
        color: var(--dark-primary);
    }

    /* 更多菜单选中状态 */
    .more-menu-item.active {
        background-color: var(--dark-elevated);
        color: var(--dark-primary);
    }

    .more-menu-item.active .more-menu-item-icon {
        color: var(--dark-primary);
        transform: scale(1.1);
        transition: transform 0.2s ease;
    }

    .more-menu-item.active .more-menu-item-text {
        font-weight: 600;
        color: var(--dark-primary);
    }
}

.bottom-nav-item.active {
    color: var(--dark-primary);
    position: relative;
}

.bottom-nav-item.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 4px;
    background-color: var(--dark-primary);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--dark-primary);
}

.bottom-nav-item.active .bottom-nav-icon {
    transform: scale(1.1);
    transition: transform 0.2s ease;
}

.bottom-nav-item.active .bottom-nav-text {
    font-weight: 600;
    color: var(--dark-primary);
}

/* 更多菜单选中状态 */
.more-menu-item.active {
    background-color: var(--dark-elevated);
    color: var(--dark-primary);
}

.more-menu-item.active .more-menu-item-icon {
    color: var(--dark-primary);
    transform: scale(1.1);
    transition: transform 0.2s ease;
}

.more-menu-item.active .more-menu-item-text {
    font-weight: 600;
    color: var(--dark-primary);
}