* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    background: #f5f7fa;
    color: #333;
}

/* 顶部 Header */
.header {
    height: 56px;
    background: #ffffff;
    border-bottom: 1px solid #e5e7eb;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
}

.header .title {
    font-size: 18px;
    font-weight: 600;
}

.header .user a {
    color: #2563eb;
    text-decoration: none;
}

/* 主体布局 */
.main {
    display: flex;
    height: calc(100vh - 56px);
}

/* 左侧菜单 */
.sidebar {
    width: 220px;
    background: #1f2937;
    color: #fff;
}

.sidebar ul {
    list-style: none;
    padding-top: 12px;
}

.sidebar li a {
    display: block;
    padding: 12px 20px;
    font-size: 14px;
    color: #e5e7eb;
    text-decoration: none;
}

.sidebar li a:hover,
.sidebar li a.active {
    background: #374151;
}

/* 内容区 */
.content {
    flex: 1;
    padding: 24px;
    overflow-y: auto;
}

/* 卡片 */
.card {
    background: #fff;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 1px 3px rgba(0,0,0,.06);
}

/* 表格 */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 16px;
}

table th {
    background: #f3f4f6;
    font-weight: 600;
    font-size: 13px;
}

table th,
table td {
    padding: 12px;
    border-bottom: 1px solid #e5e7eb;
    font-size: 13px;
    text-align: left;
}

.empty {
    padding: 40px;
    text-align: center;
    color: #9ca3af;
}