/* ==================== 1. 全局滚动条（保持不变） ==================== */
html {
    scrollbar-width: thin;
    scrollbar-color: #c0c0c0 #f5f5f5;
}
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: #f5f5f5;
}
::-webkit-scrollbar-thumb {
    background: #c0c0c0;
    border-radius: 0;
}
::-webkit-scrollbar-thumb:hover {
    background: #a0a0a0;
}

/* ==================== 2. 侧边栏滚动条：平时隐藏，悬停棒状 ==================== */
.sidebar {
    /* 关键 1：让外层 .sidebar 负责滚动 */
    overflow-y: auto;

    /* 关键 2：Firefox 先隐藏 */
    scrollbar-width: none;
}
/* 关键 3：Chrome/Edge/Safari 先隐藏 */
.sidebar::-webkit-scrollbar {
    width: 0;
    background: transparent;
}
/* 关键 4：悬停时出现 8 px 棒状，轨道透明 */
.sidebar:hover::-webkit-scrollbar {
    width: 8px;
}
.sidebar:hover::-webkit-scrollbar-track {
    background: transparent;      /* 轨道完全隐藏 */
}
.sidebar:hover::-webkit-scrollbar-thumb {
    background: #c0c0c0;
    border-radius: 4px;           /* 棒圆角 */
}
.sidebar:hover::-webkit-scrollbar-thumb:hover {
    background: #a0a0a0;
}
/* 暗色模式棒颜色 */
body.dark-mode .sidebar:hover::-webkit-scrollbar-thumb {
    background: #4a4a6a;
}
body.dark-mode .sidebar:hover::-webkit-scrollbar-thumb:hover {
    background: #606085;
}
body {
    margin: 0;
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    background-color: #f8f9fa;
    color: #333;
    overflow-x: hidden;
    display: flex;
    min-height: 100vh;
    flex-direction: column;
    padding-top: 60px;
}
main {
    flex: 1;
    min-height: calc(100vh - 60px);
    padding: 20px 0;
    margin-top: -60px;
    padding-top: 60px;
    display: flex;
    flex-direction: column;
}
.content-container {
    max-width: 1560px;
    margin: 0 auto;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: white;
    height: 60px;
    padding: 0 20px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid #e0e0e0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}
:root {
    --primary-color: #ff4500;
    --card-hover-shadow: 0 4px 12px rgba(0,0,0,0.15);
    --transition-speed: 0.3s;
}
* { box-sizing: border-box; }
.page-wrapper {
    margin-left: 260px;
    padding: 10px;
    transition: margin-left 0.3s ease;
    height: calc(100vh - 60px);
    overflow-y: auto;
    margin-top: 60px;
}
.page-wrapper.expanded {
    margin-left: 30px;
}
/* 通用 .scroll-container 仅保留功能，不控制外观 */
.scroll-container {
    overflow-y: auto;
}