/* 布局样式：侧边栏、主内容区域、滚动条 */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 230px;
    background: var(--sidebar-bg);
    box-shadow: var(--shadow-md);
    padding: 20px 20px 40px;
    transition: width var(--duration-short) var(--ease-in-out-cubic),
        padding var(--duration-short) var(--ease-in-out-cubic),
        background-color var(--duration-short) var(--ease-default);
    overflow-y: auto;
    overflow-x: hidden;
    height: 100vh;
    z-index: 1000;
    /* 侧边栏始终隐藏滚动条 */
    scrollbar-width: none;
    -ms-overflow-style: none;
    will-change: background-color;
    box-sizing: border-box;
    border-radius: 0 15px 15px 0;
}

/* 隐藏侧边栏滚动条 */
.sidebar::-webkit-scrollbar {
    display: none;
}

/* 小于1024px时默认收起侧边栏 */
/* 注意: 1023px 对应 BREAKPOINT_SIDEBAR (1024px) - 1 */
@media screen and (max-width: 1023px) {
    .sidebar:not(.js-initialized) {
        width: 0;
        padding: 0;
        overflow: hidden;
    }
}

.sidebar.collapsed {
    width: 0;
    padding: 0;
    overflow: hidden;
}

/* 侧栏收起时立即隐藏主页按钮和文件夹，但保持切换按钮可见 */
.sidebar.collapsed .home-button,
.sidebar.collapsed .folder {
    opacity: 0;
    visibility: hidden;
    transition: none;
}
.sidebar .folder {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 1.0rem 0;
    margin-left: 10px;
    user-select: none;
    -webkit-user-drag: none;
    -webkit-touch-callout: none;
    backface-visibility: hidden;
    will-change: opacity;
    transform: translateZ(0);
}
.sidebar .folder-name {
    font-size: 1.15rem;
    padding: 0.5rem 1rem;
    cursor: pointer;
    transition: background var(--duration-base) var(--ease-default), transform var(--duration-base) var(--ease-default), box-shadow var(--duration-base) var(--ease-default);
    border-radius: 4px;
}
/* 侧边栏悬停效果 - 仅在PC端生效 */
@media (hover: hover) and (pointer: fine) {
    .sidebar .folder-name:hover {
        background: var(--hover-bg);
        box-shadow: 16px 6px 12px rgba(0, 0, 0, 0.3);
        transform: translateY(-2px) scale(1.05);
    }
    [data-theme='dark'] .sidebar .folder-name:hover {
        background: rgba(255, 255, 255, 0.1);
        box-shadow: 0 6px 12px rgba(255, 255, 255, 0.2);
    }
}
.sidebar-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 20px;
    padding: 0 5px;
    /* 确保布局稳定性 */
    flex-wrap: nowrap;
    min-height: 40px;
}

.home-button {
    border: none;
    background: none;
    padding: 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    /* 确保位置稳定 */
    flex-shrink: 0;
    align-self: flex-start;
}
.main-content {
    margin-left: 250px;
    margin-right: 120px;
    min-height: 100vh;
    padding: 20px 20px 20px 60px;
    flex: 1;
    box-sizing: border-box;
    transition: margin-left var(--duration-short) var(--ease-in-out-cubic),
                padding var(--duration-short) var(--ease-in-out-cubic);
    position: relative;
    z-index: 2;
    will-change: margin-left, padding;
    overflow-y: auto;
    /* 完全隐藏滚动条 */
    scrollbar-width: none;
    -ms-overflow-style: none;
}

/* 隐藏主内容区滚动条 */
.main-content::-webkit-scrollbar {
    display: none;
}

/* 小于1024px时默认调整主内容区 */
@media screen and (max-width: 1023px) {
    .main-content {
        margin-left: 120px;
        margin-right: 120px;
        padding: 20px;
    }
}

.sidebar.collapsed + .main-content {
    margin-left: 120px;
    margin-right: 120px;
    padding: 20px;
}