/**
 * 智能内容区样式
 * 底部空间补偿组件，仅在临界状态时显示
 * 完全适配全局主题CSS变量系统
 */

/* 智能底部空间容器 */
.smart-bottom-space {
    position: relative;
    width: 100%;
    height: 0;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    margin-top: 20px;
    flex-shrink: 0;
    visibility: hidden;
    /* 移除 display: none，让JavaScript完全控制 */
}

/* 显示状态 */
.smart-bottom-space.visible {
    display: block; /* 显示容器 */
    height: 65px;
    min-height: 65px; /* 确保最小高度 */
    opacity: 1;
    pointer-events: auto;
    visibility: visible;
    transition: opacity 0.3s ease, height 0.3s ease, min-height 0.3s ease; /* 精确控制过渡 */
}

/* 隐藏状态 */
.smart-bottom-space.hidden {
    opacity: 0;
    pointer-events: none;
    visibility: hidden;
    height: 0;
    transition: opacity 0.3s ease, height 0.3s ease; /* 精确控制过渡 */
}

/* 底部空间内部容器 */
.smart-bottom-space-inner {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    border: 1px solid var(--bg-border);
    border-radius: var(--border-radius);
    position: relative;
    overflow: hidden;
    transition: all var(--transition-fast);
    cursor: pointer;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
}

/* 底部空间背景动画 */
.smart-bottom-space-inner::before {
    content: '';
    position: absolute;
    top: 0;
    left: -200%;
    width: 200%;
    height: 100%;
    background: linear-gradient(90deg, 
        transparent 0%, 
        transparent 40%,
        var(--link-color) 50%, 
        transparent 60%,
        transparent 100%);
    opacity: 0.08;
    animation: shimmer 3s ease-in-out infinite;
}

/* 指示器容器 */
.smart-bottom-space-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    z-index: 1;
    position: relative;
}

/* 指示器文字 */
.indicator-text {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
    letter-spacing: 0.5px;
    opacity: 0.8;
    transition: all var(--transition-fast);
}

/* 指示器箭头 */
.indicator-arrow {
    font-size: 16px;
    color: var(--link-color);
    animation: bounce 1.5s ease-in-out infinite;
    transition: all var(--transition-fast);
}

/* 鼠标悬停效果 */
.smart-bottom-space-inner:hover {
    background: var(--hover-bg);
    border-color: var(--bg-border);
    box-shadow: var(--shadow-md);
}

.smart-bottom-space-inner:hover .indicator-text {
    opacity: 1;
    color: var(--text-color);
}

.smart-bottom-space-inner:hover .indicator-arrow {
    transform: translateY(2px);
    color: var(--link-hover);
}

/* 点击效果 */
.smart-bottom-space-inner:active {
    background: var(--active-bg);
    transform: scale(0.98);
}

/* 动画效果 */
@keyframes shimmer {
    0% {
        left: -200%;
        opacity: 0;
    }
    20% {
        opacity: 0.08;
    }
    80% {
        opacity: 0.08;
    }
    100% {
        left: 200%;
        opacity: 0;
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
        opacity: 0.8;
    }
    40% {
        transform: translateY(-2px);
        opacity: 1;
    }
    60% {
        transform: translateY(-1px);
        opacity: 0.9;
    }
}

/* 深色模式适配 */
@media (prefers-color-scheme: dark) {
    .smart-bottom-space-inner {
        background: var(--bg-secondary);
        border-color: var(--bg-border);
    }
    
    .indicator-text {
        color: var(--text-secondary);
        opacity: 0.9;
    }
    
    /* 深色模式下的动画优化 */
    .smart-bottom-space-inner::before {
        opacity: 0.05;
        background: linear-gradient(90deg, 
            transparent 0%, 
            transparent 40%,
            var(--link-color) 50%, 
            transparent 60%,
            transparent 100%);
    }
    
    .indicator-arrow {
        opacity: 0.7;
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .smart-bottom-space.visible {
        height: 55px;
        min-height: 55px;
    }
    
    .indicator-text {
        font-size: 12px;
    }
    
    .indicator-arrow {
        font-size: 14px;
    }
    
    .smart-bottom-space-inner {
        margin: 0 8px;
        border-radius: 8px;
    }
}

@media (max-width: 480px) {
    .smart-bottom-space.visible {
        height: 50px;
        min-height: 50px;
    }
    
    .indicator-text {
        font-size: 11px;
    }
    
    .indicator-arrow {
        font-size: 12px;
    }
}

/* 高对比度模式适配 */
@media (prefers-contrast: high) {
    .smart-bottom-space-inner {
        border: 2px solid var(--link-color);
        background: var(--bg-secondary);
    }
    
    .indicator-text {
        opacity: 1;
        font-weight: 600;
    }
    
    /* 高对比度下的动画增强 */
    .smart-bottom-space-inner::before {
        opacity: 0.15;
        background: linear-gradient(90deg, 
            transparent 0%, 
            var(--link-color) 30%, 
            var(--link-hover) 50%, 
            var(--link-color) 70%, 
            transparent 100%);
    }
    
    .indicator-arrow {
        opacity: 1;
        font-weight: bold;
    }
}

/* 减少动画模式适配 */
@media (prefers-reduced-motion: reduce) {
    .smart-bottom-space,
    .smart-bottom-space-inner,
    .indicator-text,
    .indicator-arrow {
        transition: none;
        animation: none;
    }
    
    .smart-bottom-space-inner::before {
        display: none;
    }
}

/* 打印样式 */
@media print {
    .smart-bottom-space {
        display: none !important;
    }
}

/* 与现有组件的集成样式 */
/* 确保在导航网格之后正确显示 */
.navigation-grid-container + .smart-bottom-space {
    margin-top: 30px;
}

/* 当没有导航数据时的样式 */
.navigation-loading + .smart-bottom-space,
.navigation-error + .smart-bottom-space {
    margin-top: 20px;
}

/* 临时测试样式 - 强制显示底部空间 */
.smart-bottom-space.test-visible {
    height: 60px !important;
    min-height: 60px !important;
    opacity: 1 !important;
    visibility: visible !important;
    pointer-events: auto !important;
}

/* 与现有组件的集成样式 */
/* 确保在导航网格之后正确显示 */
.navigation-grid-container + .smart-bottom-space {
    margin-top: 30px;
}

/* 当没有导航数据时的样式 */
.navigation-loading + .smart-bottom-space,
.navigation-error + .smart-bottom-space {
    margin-top: 20px;
}