/* 第1區塊：主要容器架構 */
.app-container {
    display: flex;
    height: 100vh;
    background: var(--bg-color);
}

.header {
    display: none;
}


/* 頂部欄 */
.top-header {
    height: 8px;
    background: var(--main-content-bg);
    display: flex;
    justify-content: flex-end;
    align-items: center;
    padding: 0 var(--spacing-xl);
    z-index: 100;
    transition: all 0.3s ease;
}

.main-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.header-controls {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

/* 底部容器 */
.bottom-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* 第2區塊：側邊欄基礎架構 */
/* 側邊欄樣式 */
.bottom-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* 徹底隱藏側邊欄及其所有子元素的滾動條 */
.sidebar,
.sidebar *,
.sidebar-content,
.sidebar-header,
.sidebar-footer {
    scrollbar-width: none !important;
    -ms-overflow-style: none !important;
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    box-shadow: var(--shadow-light);
    transition: all 0.3s ease;
    scrollbar-width: none; 
    -ms-overflow-style: none;
}

/* 隱藏側邊欄滾動條 */
.sidebar::-webkit-scrollbar,
.sidebar *::-webkit-scrollbar,
.sidebar-content::-webkit-scrollbar,
.sidebar-header::-webkit-scrollbar,
.sidebar-footer::-webkit-scrollbar {
    display: none !important;
    width: 0 !important;
    background: transparent !important;
}

.sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
}

/* 第3區塊：側邊欄收合邏輯 */
    .sidebar {
        display: flex;
        flex-direction: column;
        /* 使用 100vh 確保側邊欄和視窗一樣高，這是最可靠的方式 */
        height: 100vh; 
    }

    /* 當側邊欄收合時，徹底隱藏所有「展開時」才需要的內容 */
    .sidebar.collapsed .sidebar-section,
    .sidebar.collapsed .sidebar-content,
    .sidebar.collapsed .sidebar-footer {
        display: none;
    }

    #sidebar-collapsed-icons {
        flex-grow: 1;
        display: flex;
        flex-direction: column; 
    }

    /* 將設定按鈕推到其容器的最底部 */
    #sidebar-collapsed-icons .collapsed-icon-btn[title="Setting"] {
        margin-top: auto;
        margin-bottom: 12px;
    }

.sidebar.collapsed .sidebar-content {
    opacity: 0;
    transform: translateX(-20px);
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease;
}

.sidebar.collapsed .sidebar-footer {
    opacity: 0;
    transform: translateX(-20px);
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease;
}

.sidebar.collapsed .sidebar-section {
    opacity: 0;
    transform: translateX(-20px);
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease;
}

/* 第4區塊：主內容區域 */
/* 主要內容區域 */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--main-content-bg);
    margin-left: 0;
}

.content-area {
    flex: 1;
    overflow-y: auto;
    padding: 2px 24px;
    background: var(--main-content-bg);
    scrollbar-width: thin;
    scrollbar-color: var(--scrollbar-thumb-color) transparent;
}

/* 第5區塊：版本面板網格系統 */
/* 版本面板與比較視圖 */
.versions-container {
    display: grid;
    gap: var(--spacing-xxl);
}

.versions-container.single-view {
    grid-template-columns: 1fr;
    max-width: 60%;
    margin: 0 auto;
}

.versions-container.compare-view {
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    max-width: 100%;
    margin: 0 auto;
}