```css
/**
 * admin.css - 龙辉起重管理后台样式
 * 发票管家风格
 */

/* ========== 基础重置 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
}

body {
    font-family: "Microsoft YaHei", "微软雅黑", Arial, sans-serif;
    font-size: 14px;
    color: #333;
    background: #f0f2f5;
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: #333;
    transition: color 0.2s;
}

a:hover {
    color: #F37021;
}

ul, li {
    list-style: none;
}

/* ========== 顶部白色导航条 ========== */
.topbar {
    height: 52px;
    background: #fff;
    border-bottom: 1px solid #e5e5e5;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.topbar-inner {
    max-width: 100%;
    height: 100%;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.topbar-brand {
    display: flex;
    align-items: center;
    font-size: 17px;
    font-weight: bold;
    color: #3b8132;
}

.brand-icon {
    font-size: 22px;
    margin-right: 8px;
}

.topbar-nav {
    display: flex;
    align-items: center;
    gap: 6px;
}

.top-link {
    padding: 6px 12px;
    border-radius: 4px;
    color: #555;
    font-size: 13px;
}

.top-link:hover {
    background: #F37021;
    color: #fff;
}

.top-link-logout:hover {
    background: #e74c3c;
    color: #fff;
}

.top-user {
    margin-left: 12px;
    padding-left: 12px;
    border-left: 1px solid #e5e5e5;
    color: #3b8132;
    font-weight: bold;
    font-size: 13px;
}

/* ========== 绿色功能导航菜单栏 ========== */
.mainnav {
    height: 42px;
    background: #3b8132;
    position: sticky;
    top: 52px;
    z-index: 999;
}

.mainnav-inner {
    max-width: 100%;
    height: 100%;
    padding: 0 20px;
    display: flex;
    align-items: center;
    overflow-x: auto;
}

.menu-toggle {
    display: none;
    background: transparent;
    border: none;
    color: #fff;
    font-size: 20px;
    cursor: pointer;
    padding: 0 10px;
    margin-right: 5px;
}

.mainnav-item {
    display: flex;
    align-items: center;
    height: 42px;
    padding: 0 16px;
    color: #fff;
    font-size: 14px;
    white-space: nowrap;
    transition: background 0.2s;
}

.mainnav-item:hover {
    background: #F37021;
    color: #fff;
}

.mainnav-item.active {
    background: #2d6626;
    color: #fff;
    font-weight: bold;
}

.mainnav-item .nav-icon {
    margin-right: 5px;
}

/* ========== 地址/筛选条件栏 ========== */
.addrbar {
    height: 36px;
    background: #fff;
    border-bottom: 1px solid #e5e5e5;
}

.addrbar-inner {
    height: 100%;
    padding: 0 20px;
    display: flex;
    align-items: center;
}

.breadcrumb {
    font-size: 13px;
    color: #666;
}

.bc-home {
    color: #999;
    margin-right: 5px;
}

.breadcrumb a {
    color: #3b8132;
}

.breadcrumb a:hover {
    color: #F37021;
}

.bc-current {
    color: #333;
    font-weight: bold;
}

.bc-sep {
    margin: 0 5px;
    color: #ccc;
}

/* ========== 主体布局 ========== */
.layout {
    display: flex;
    min-height: calc(100vh - 52px - 42px - 36px - 40px);
}

/* ========== 左侧垂直菜单 ========== */
.sidebar {
    width: 220px;
    background: #fff;
    border-right: 1px solid #e5e5e5;
    flex-shrink: 0;
    transition: transform 0.3s;
}

.sidebar-header {
    height: 40px;
    line-height: 40px;
    padding: 0 16px;
    font-size: 13px;
    font-weight: bold;
    color: #999;
    background: #fafafa;
    border-bottom: 1px solid #eee;
}

.sidebar-nav {
    padding: 8px 0;
}

.sidebar-item {
    display: flex;
    align-items: center;
    padding: 11px 20px;
    color: #333;
    font-size: 14px;
    border-left: 3px solid transparent;
    transition: all 0.2s;
}

.sidebar-item:hover {
    background: #f5f5f5;
    color: #F37021;
    border-left-color: #F37021;
}

.sidebar-item.active {
    background: #f0f7ee;
    color: #3b8132;
    border-left-color: #3b8132;
    font-weight: bold;
}

.sidebar-item .nav-icon {
    margin-right: 10px;
    font-size: 16px;
}

/* ========== 右侧主内容区 ========== */
.main-content {
    flex: 1;
    padding: 16px;
    min-width: 0;
}

/* 标题栏 */
.page-titlebar {
    height: 60px;
    background: #fff;
    border-radius: 4px 4px 0 0;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid #eee;
}

.page-title {
    font-size: 18px;
    font-weight: bold;
    color: #333;
}

.page-actions {
    display: flex;
    gap: 8px;
}

/* 内容容器 */
.content-box {
    background: #fff;
    border-radius: 0 0 4px 4px;
    padding: 20px;
    min-height: 400px;
}

/* ========== 按钮 ========== */
.btn {
    display: inline-block;
    padding: 8px 16px;
    font-size: 13px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
    line-height: 1.4;
}

.btn-primary {
    background: #3b8132;
    color: #fff;
}

.btn-primary:hover {
    background: #F37021;
    color: #fff;
}

.btn-success {
    background: #27ae60;
    color: #fff;
}

.btn-success:hover {
    background: #F37021;
    color: #fff;
}

.btn-default {
    background: #f0f0f0;
    color: #333;
    border: 1px solid #ddd;
}

.btn-default:hover {
    background: #F37021;
    color: #fff;
    border-color: #F37021;
}

.btn-danger {
    background: #e74c3c;
    color: #fff;
}

.btn-danger:hover {
    background: #c0392b;
    color: #fff;
}

.btn-block {
    display: block;
    width: 100%;
    padding: 12px;
    font-size: 15px;
}

/* ========== 统计卡片 ========== */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 16px;
}

.stat-card {
    background: #fff;
    border-radius: 4px;
    padding: 20px;
    display: flex;
    align-items: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    transition: transform 0.2s, box-shadow 0.2s;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.stat-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    margin-right: 16px;
    flex-shrink: 0;
}

.stat-icon-blue { background: #e3f2fd; }
.stat-icon-green { background: #e8f5e9; }
.stat-icon-orange { background: #fff3e0; }
.stat-icon-purple { background: #f3e5f5; }

.stat-info {
    flex: 1;
}

.stat-num {
    font-size: 26px;
    font-weight: bold;
    color: #3b8132;
    line-height: 1.2;
}

.stat-label {
    font-size: 13px;
    color: #999;
    margin-top: 4px;
}

/* ========== 面板 ========== */
.panel {
    background: #fff;
    border-radius: 4px;
    margin-bottom: 16px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    overflow: hidden;
}

.panel-header {
    padding: 14px 20px;
    border-bottom: 1px solid #eee;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.panel-title {
    font-size: 15px;
    font-weight: bold;
    color: #333;
    position: relative;
    padding-left: 12px;
}

.panel-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 16px;
    background: #3b8132;
    border-radius: 2px;
}

.panel-body {
    padding: 20px;
}

.panel-body.no-padding {
    padding: 0;
}

/* ========== 快捷入口 ========== */
.quick-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.quick-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 24px 12px;
    background: #f9f9f9;
    border: 1px solid #eee;
    border-radius: 4px;
    transition: all 0.2s;
}

.quick