* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft Yahei", system-ui, -apple-system, sans-serif;
}

body {
    background: #f5f7fb;
    height: 100vh;
    display: flex;
    color: #1e293b;
    overflow: hidden;
}

/* 移动端汉堡按钮 */
.mobile-menu-btn {
    display: none;
    position: fixed;
    top: 16px;
    left: 16px;
    z-index: 101;
    width: 42px;
    height: 42px;
    border-radius: 10px;
    border: none;
    background: #ffffff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.12);
    font-size: 20px;
    color: #334155;
    cursor: pointer;
    opacity: 1;
    visibility: visible;
    transition: opacity 0.24s, visibility 0.24s;
}

body.mobile-sidebar-open .mobile-menu-btn {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

/*侧边栏*/
.sidebar {
    width: 220px;
    background: #ffffff;
    border-right: 1px solid #e2e8f0;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    box-shadow: 0 0 30px rgba(0,0,0,0.04);
    transition: width 0.32s cubic-bezier(0.4,0,0.2,1);
    height: 100vh;
}

.sidebar.collapsed {
    width: 64px;
}

.sidebar-logo {
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 14px;
    font-size: 17px;
    font-weight: 700;
    color: #0f172a;
    border-bottom: 1px solid #e2e8f0;
    flex-shrink: 0;
}

.sidebar-logo-text {
    white-space: nowrap;
    overflow: hidden;
    transition: opacity 0.28s;
}

.sidebar.collapsed .sidebar-logo-text {
    opacity: 0;
}

.collapse-btn {
    background: #f3f4f6;
    border: none;
    width: 34px;
    height: 34px;
    border-radius: 8px;
    cursor: pointer;
    font-size:15px;
    flex-shrink:0;
    color:#475569;
    transition:0.2s;
}
.collapse-btn:hover {
    background:#e5e7eb;
}

.sidebar-menu {
    padding:14px 10px;
    display:flex;
    flex-direction:column;
    flex:1;
    min-height:0;
    overflow-y:auto;
    overflow-x:hidden;
    user-select:none !important;
}
.sidebar-menu::-webkit-scrollbar {
    width:5px;
}
.sidebar-menu::-webkit-scrollbar-thumb {
    background:#cbd5e1;
    border-radius:4px;
}
.sidebar-menu::-webkit-scrollbar-track {
    background:transparent;
}

.menu-item-wrap {
    display:flex;
    flex-direction:column;
    margin-bottom:4px;
}
.menu-parent-wrap {
    display:flex;
    align-items:center;
    border-radius:9px;
    cursor:pointer;
    flex-shrink:0;
}
.menu-parent-link,
.menu-parent-div {
    flex:1;
    display:flex;
    align-items:center;
    gap:10px;
    color:#64748b;
    text-decoration:none;
    padding:11px 12px;
    border-radius:9px;
    font-size:14px;
    font-weight:500;
    transition:0.2s ease;
    white-space:nowrap;
}
.arrow-toggle-btn {
    width:34px;
    height:34px;
    display:flex;
    align-items:center;
    justify-content:center;
    background:transparent;
    border:none;
    border-radius:8px;
    cursor:pointer;
    color:#94a3b8;
    flex-shrink:0;
}
.arrow-icon {
    transition:transform 0.24s ease;
}
.arrow-icon.open {
    transform:rotate(90deg);
}

.sidebar.collapsed .arrow-toggle-btn {
    display:none;
}
.sidebar.collapsed .menu-parent-link,
.sidebar.collapsed .menu-parent-div {
    justify-content:center;
    gap:0;
    padding:11px 0;
}
.sidebar-menu a span.menu-text,
.sidebar-menu div span.menu-text {
    transition:opacity 0.28s;
    white-space:nowrap;
}
.sidebar.collapsed .menu-text {
    opacity:0;
    width:0;
    overflow:hidden;
}

.sidebar-menu a:hover,
.sidebar-menu div.menu-parent-div:hover {
    background:#f1f5f9;
    color:#334155;
}
.sidebar-menu a.menu-parent-link.active,
.submenu a.active,
.submenu-item.active {
    background:#eef2ff !important;
    color:#4f46e5 !important;
    font-weight:600 !important;
}

.submenu {
    padding-left:18px;
    max-height:0;
    overflow:hidden;
    transition:max-height 0.35s ease;
    display:flex;
    flex-direction:column;
    gap:3px;
}
.submenu.open {
    max-height:9999px;
}
.submenu a,
.submenu-item {
    padding:9px 12px;
    font-size:13.5px;
    color:#64748b;
    text-decoration:none;
    border-radius:9px;
    display:flex;
    align-items:center;
    gap:10px;
    transition:0.2s;
    white-space:nowrap;
    flex-shrink:0;
}
.submenu a:hover,
.submenu-item:hover {
    background:#f1f5f9;
    color:#334155;
}

.main-box {
    flex:1;
    display:flex;
    flex-direction:column;
    min-width:0;
    height:100vh;
}
.topbar {
    height:64px;
    background:#ffffff;
    border-bottom:1px solid #e2e8f0;
    display:flex;
    align-items:center;
    justify-content:flex-end;
    padding:0 32px;
    gap:12px;
    flex-shrink:0;
}
.topbar .user {
    font-size:14px;
    color:#475569;
    margin-right:4px;
}
.topbar .btn {
    border:none;
    outline:none;
    text-decoration:none;
    padding:9px 18px;
    border-radius:9px;
    font-size:14px;
    font-weight:500;
    cursor:pointer;
    transition:0.2s ease;
}
.btn-pwd {
    background:#f1f5f9;
    color:#475569;
}
.btn-pwd:hover {
    background:#e2e7eb;
}
.btn-logout {
    background:#fef2f2;
    color:#dc2626;
}
.btn-logout:hover {
    background:#fee2e2;
}
.content {
    flex:1;
    padding:12px 16px;
    overflow-y:auto;
    min-height:0;
}
.sidebar-menu i {
    width:24px;
    margin-right:8px;
    font-size:16px;
    display:inline-block;
}

/*移动端适配*/
@media (max-width:768px) {
    .mobile-menu-btn {
        display:block;
    }
    .collapse-btn {
        display:none;
    }
    .sidebar {
        position:fixed;
        left:-220px;
        top:0;
        bottom:0;
        z-index:99;
        transition:left 0.3s ease;
        width:220px;
    }
    .sidebar.show {
        left:0;
    }
    .sidebar.collapsed {
        width:220px;
        left:-220px;
    }
    .sidebar.collapsed.show {
        left:0;
    }
    .topbar {
        padding:0 20px;
    }
    .content {
        padding:24px 20px;
    }
}