/* 底部导航栏样式 - 只在手機端顯示 */
:root {
    --mobile-bottom-nav-base-height: 70px;
    --mobile-bottom-nav-space: calc(var(--mobile-bottom-nav-base-height) + env(safe-area-inset-bottom, 0px));
}

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    border-top: 1px solid #e0e0e0;
    display: none; /* 預設隱藏 */
    justify-content: space-around;
    align-items: center;
    padding: 8px 0;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

.bottom-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    padding: 8px 4px;
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: 8px;
    margin: 0 2px;
    min-height: 60px;
    color: #999;
}

.bottom-nav-item:hover {
    background: #f5f5f5;
}

.bottom-nav-item.active {
    color: #000;
}

.bottom-nav-icon {
    font-size: 20px;
    margin-bottom: 4px;
    transition: all 0.3s ease;
    filter: grayscale(100%);
    opacity: 0.6;
}

.bottom-nav-item.active .bottom-nav-icon {
    transform: scale(1.1);
    filter: grayscale(0%);
    opacity: 1;
}

.bottom-nav-text {
    font-size: 12px;
    font-weight: 500;
    transition: all 0.3s ease;
    color: #999;
}

.bottom-nav-item.active .bottom-nav-text {
    font-weight: bold;
    color: #000;
}

/* 响应式设计 - 只在手機端顯示底部導航欄 */
@media (max-width: 767px) {
    html body.has-bottom-nav {
        padding-bottom: var(--mobile-bottom-nav-space);
        scroll-padding-bottom: var(--mobile-bottom-nav-space);
    }

    .bottom-nav {
        display: flex; /* 手機端顯示 */
        padding: 6px 0 calc(6px + env(safe-area-inset-bottom, 0px));
    }
    
    .bottom-nav-item {
        padding: 6px 2px;
        min-height: 50px;
    }
    
    .bottom-nav-icon {
        font-size: 18px;
    }
    
    .bottom-nav-text {
        font-size: 11px;
    }
}

@media (max-width: 480px) {
    .bottom-nav-text {
        font-size: 10px;
    }
    
    .bottom-nav-icon {
        font-size: 16px;
    }
}