* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: "Microsoft YaHei", Arial, sans-serif;
    background: #f0f2f5;
    color: #333;
}
a { text-decoration: none; color: inherit; }

/* 登录页 */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}
.admin-login-box {
    width: 400px;
    background: white;
    padding: 40px 30px;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
}
.admin-login-box h2 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
}

/* 后台布局 */
.admin-layout { display: flex; min-height: 100vh; }
.sidebar {
    width: 220px;
    background: #001529;
    color: white;
    flex-shrink: 0;
}
.sidebar-logo {
    padding: 20px;
    font-size: 18px;
    font-weight: bold;
    text-align: center;
    border-bottom: 1px solid #1f2d3d;
}
.sidebar-menu { padding: 10px 0; }
.menu-item {
    display: block;
    padding: 12px 25px;
    color: rgba(255,255,255,0.7);
    transition: all 0.2s;
    border-left: 3px solid transparent;
}
.menu-item:hover, .menu-item.active {
    background: #1890ff;
    color: white;
    border-left-color: #fff;
}
.main-content { flex: 1; display: flex; flex-direction: column; }
.top-bar {
    height: 60px;
    background: white;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.1);
}
.top-bar-right { display: flex; gap: 15px; align-items: center; }
.content-body { padding: 20px; flex: 1; }

/* 卡片 */
.card {
    background: white;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}
.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid #eee;
}
.card-title { font-size: 16px; font-weight: bold; }

/* 按钮 */
.btn {
    padding: 7px 15px;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    font-size: 13px;
    display: inline-block;
}
.btn-primary { background: #1890ff; color: white; }
.btn-success { background: #52c41a; color: white; }
.btn-danger { background: #ff4d4f; color: white; }
.btn-warning { background: #faad14; color: white; }
.btn-default { background: #f0f0f0; color: #333; }
.btn-sm { padding: 4px 10px; font-size: 12px; }

/* 表格 */
.admin-table { width: 100%; border-collapse: collapse; }
.admin-table th, .admin-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #f0f0f0;
    font-size: 14px;
}
.admin-table th {
    background: #fafafa;
    font-weight: 600;
    color: #555;
}
.admin-table tr:hover { background: #f9f9f9; }

/* 表单 */
.form-row { display: flex; gap: 20px; margin-bottom: 15px; }
.form-item { flex: 1; }
.form-item label {
    display: block;
    margin-bottom: 6px;
    color: #666;
    font-size: 13px;
}
.form-item input, .form-item select, .form-item textarea {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid #d9d9d9;
    border-radius: 4px;
    font-size: 14px;
    outline: none;
}
.form-item input:focus, .form-item select:focus, .form-item textarea:focus {
    border-color: #1890ff;
}
.form-item textarea { resize: vertical; min-height: 100px; }

/* 统计卡片 */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 20px;
}
.stat-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}
.stat-number {
    font-size: 28px;
    font-weight: bold;
    color: #1890ff;
    margin-bottom: 5px;
}
.stat-label { color: #888; font-size: 14px; }

/* 分页 */
.pagination {
    display: flex;
    justify-content: flex-end;
    gap: 5px;
    margin-top: 20px;
}
.pagination a, .pagination span {
    padding: 6px 12px;
    border: 1px solid #d9d9d9;
    border-radius: 4px;
    font-size: 13px;
    background: white;
}
.pagination .active {
    background: #1890ff;
    color: white;
    border-color: #1890ff;
}

/* 状态标签 */
.status-tag {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
}
.tag-green { background: #f6ffed; color: #52c41a; border: 1px solid #b7eb8f; }
.tag-red { background: #fff2f0; color: #ff4d4f; border: 1px solid #ffccc7; }
.tag-blue { background: #e6f7ff; color: #1890ff; border: 1px solid #91d5ff; }
.tag-orange { background: #fff7e6; color: #fa8c16; border: 1px solid #ffd591; }
.tag-gray { background: #fafafa; color: #8c8c8c; border: 1px solid #d9d9d9; }

/* 复选框组 */
.checkbox-group { display: flex; gap: 15px; flex-wrap: wrap; }
.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
}

.alert {
    padding: 10px 15px;
    border-radius: 4px;
    margin-bottom: 15px;
}
.alert-success { background: #f6ffed; border: 1px solid #b7eb8f; color: #52c41a; }
.alert-error { background: #fff2f0; border: 1px solid #ffccc7; color: #ff4d4f; }

/* ========== 后台移动端适配 ========== */
@media (max-width: 768px) {
    /* 整体布局：侧边栏改顶部横向滚动 */
    .admin-layout {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
    }
    .sidebar-logo {
        padding: 15px;
        font-size: 16px;
    }
    .sidebar-menu {
        display: flex;
        overflow-x: auto;
        white-space: nowrap;
        padding: 0;
        -webkit-overflow-scrolling: touch;
    }
    .sidebar-menu::-webkit-scrollbar {
        display: none;
    }
    .menu-item {
        display: inline-block;
        padding: 12px 18px;
        border-left: none;
        border-bottom: 3px solid transparent;
        font-size: 14px;
    }
    .menu-item:hover, .menu-item.active {
        border-left: none;
        border-bottom-color: #fff;
    }

    /* 顶部栏 */
    .top-bar {
        height: auto;
        padding: 10px 15px;
        flex-wrap: wrap;
        gap: 8px;
        font-size: 13px;
    }

    /* 内容区 */
    .content-body {
        padding: 12px;
    }
    .card {
        padding: 15px;
        margin-bottom: 15px;
    }
    .card-header {
        flex-wrap: wrap;
        gap: 10px;
    }

    /* 统计卡片 */
    .stat-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
    .stat-card {
        padding: 15px;
    }
    .stat-number {
        font-size: 22px;
    }
    .stat-label {
        font-size: 13px;
    }

    /* 表单 */
    .form-row {
        flex-direction: column;
        gap: 12px;
    }
    .checkbox-group {
        gap: 10px;
    }
    .btn {
        padding: 8px 16px;
        font-size: 14px;
    }

    /* 表格横向滚动 */
    .card {
        overflow-x: auto;
    }
    .admin-table {
        min-width: 640px;
    }
    .admin-table th, .admin-table td {
        padding: 10px 8px;
        font-size: 13px;
        white-space: nowrap;
    }

    /* 登录页 */
    .admin-login-box {
        width: 90%;
        padding: 30px 20px;
    }

    /* 分页 */
    .pagination {
        justify-content: flex-start;
        flex-wrap: wrap;
    }
}

@media (max-width: 480px) {
    .stat-grid {
        grid-template-columns: 1fr;
    }
    .top-bar-right {
        width: 100%;
        justify-content: flex-end;
    }
}