.sidebar {
    width: 60px;
    height: 100vh;
    transition: all 0.3s ease;
}

.sidebar.collapsed {
    width: 60px;
}

.nav-menu-container {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: 250px;
    background-color: #2c3e50;
    color: #ecf0f1;
    transition: all 0.3s ease;
    z-index: 1000;
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);
}

.nav-menu-container.collapsed {
    width: 60px;
}

.sidebar-header {
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 0 20px;
    border-bottom: 1px solid #34495e;
}

.toggle-btn {
    background: none;
    border: none;
    color: #ecf0f1;
    cursor: pointer;
    font-size: 20px;
    padding: 5px;
}

.toggle-btn:hover {
    color: #3498db;
}

.nav-item {
    position: relative;
    width: 100%;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 15px 20px;
    color: #ecf0f1;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
}

.nav-link:hover {
    background-color: #34495e;
    color: #3498db;
}

.nav-link.active {
    background-color: #34495e;
    color: #3498db;
}

.nav-icon {
    font-size: 18px;
    min-width: 20px;
}

.nav-text {
    margin-left: 15px;
    white-space: nowrap;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.collapsed .nav-text {
    opacity: 0;
    pointer-events: none;
}

.nav-arrow {
    margin-left: auto;
    transition: transform 0.3s ease;
}

.nav-arrow.rotated {
    transform: rotate(90deg);
}

.collapsed .nav-arrow {
    opacity: 0;
    pointer-events: none;
}

.dropdown-menu {
    background-color: #34495e;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.dropdown-menu.expanded {
    max-height: 500px;
}

.dropdown-item {
    display: block;
    padding: 10px 20px 10px 55px;
    color: #ecf0f1;
    text-decoration: none;
    transition: all 0.3s ease;
}

.dropdown-item:hover {
    background-color: #2c3e50;
    color: #3498db;
}

.dropdown-item.active {
    background-color: #2c3e50;
    color: #3498db;
}

/* 工具提示样式 */
.nav-item[data-tooltip]:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    left: 100%;
    top: 50%;
    transform: translateY(-50%);
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 5px 10px;
    border-radius: 4px;
    font-size: 14px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
}

.collapsed .nav-item[data-tooltip]:hover::after {
    opacity: 1;
}

/* 主要内容区域样式 */
body {
    transition: margin-left 0.3s ease;
}

body.sidebar-collapsed {
    margin-left: 60px;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .nav-menu-container {
        transform: translateX(-100%);
        width: 280px; /* 移动端稍宽一些 */
        z-index: 9999;
    }

    .nav-menu-container.mobile-expanded {
        transform: translateX(0);
    }

    /* 移动端不需要collapsed状态 */
    .nav-menu-container.collapsed {
        width: 280px;
        transform: translateX(-100%);
    }

    /* 移动端显示文字和箭头 */
    .collapsed .nav-text,
    .collapsed .nav-arrow {
        opacity: 1;
        pointer-events: auto;
    }

    /* 移动端不显示tooltip */
    .collapsed .nav-item[data-tooltip]:hover::after {
        opacity: 0;
    }

    /* 主体内容不需要margin偏移 */
    body {
        margin-left: 0 !important;
    }

    body.sidebar-collapsed {
        margin-left: 0 !important;
    }

    /* 遮罩层样式 */
    .sidebar-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 9998;
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }

    body.sidebar-open .sidebar-overlay {
        opacity: 1;
        visibility: visible;
    }

    /* 移动端汉堡菜单按钮样式调整 */
    .toggle-btn {
        transform: rotate(0deg);
        transition: transform 0.3s ease;
    }

    .nav-menu-container.mobile-expanded .toggle-btn {
        transform: rotate(180deg);
    }

    /* 移动端下拉菜单优化 */
    .dropdown-menu {
        max-height: none; /* 移动端不限制高度 */
    }

    .dropdown-menu.expanded {
        max-height: none;
    }

    /* 移动端触摸优化 */
    .nav-link {
        padding: 18px 20px; /* 增加触摸区域 */
    }

    .dropdown-item {
        padding: 12px 20px 12px 55px; /* 增加触摸区域 */
    }
}