/* ============================================
   POS管理系统 - 全局样式
   极简顶部导航（三个入口 + 模块下拉 + 分栏）
   ============================================ */

:root {
    --primary: #1a73e8;
    --primary-hover: #1557b0;
    --danger: #dc3545;
    --success: #28a745;
    --warning: #ffc107;
    --bg: #f0f2f5;
    --topbar-bg: #1e1e2d;
    --topbar-text: #a2a3b7;
    --topbar-active: #3699ff;
    --card-bg: #ffffff;
    --border: #e4e6ef;
    --text: #3f4254;
    --text-light: #7e8299;
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
    --topbar-h: 50px;
}

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

body {
    font-family: var(--font);
    font-size: 14px;
    color: var(--text);
    background: var(--bg);
}

/* ========== 布局 ========== */
.layout {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    padding-top: var(--topbar-h);
}

/* ========== 顶部栏 ========== */
.topbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--topbar-h);
    background: var(--topbar-bg);
    display: flex;
    align-items: center;
    z-index: 1000;
    box-shadow: 0 2px 6px rgba(0,0,0,0.15);
    padding: 0 8px;
}

/* 顶部所有可点击项 */
.topbar-item {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 0 16px;
    height: 100%;
    color: var(--topbar-text);
    text-decoration: none;
    font-size: 14px;
    border-bottom: 3px solid transparent;
    transition: all 0.15s;
    white-space: nowrap;
    background: none;
    border-top: none; border-left: none; border-right: none;
    cursor: pointer;
    font-family: var(--font);
}
.topbar-item:hover {
    color: #fff;
    background: rgba(255,255,255,0.06);
}
.topbar-item.active {
    color: #fff;
    border-bottom-color: var(--topbar-active);
    background: rgba(54,153,255,0.08);
}

.drop-btn {
    cursor: pointer;
}
.drop-btn .arrow {
    font-size: 10px;
    margin-left: 2px;
}

/* 汉堡（手机用） */
.topbar-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: #fff;
    font-size: 22px;
    cursor: pointer;
    width: 44px;
    height: 100%;
    flex-shrink: 0;
}
.topbar-toggle:hover {
    background: rgba(255,255,255,0.08);
}

/* ===== 下拉菜单容器 ===== */
.topbar-dropdown {
    position: relative;
    height: 100%;
    display: flex;
    align-items: center;
}

/* ===== 模块菜单（左侧弹出） ===== */
.drop-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    background: #fff;
    border-radius: 0 0 10px 10px;
    box-shadow: 0 8px 28px rgba(0,0,0,0.2);
    z-index: 1001;
    padding: 6px 0;
    max-height: 80vh;
    overflow-y: auto;
}
.drop-menu.open {
    display: block;
}
.menu-group {
    padding: 10px 20px 4px;
    font-size: 11px;
    font-weight: 700;
    color: #999;
    letter-spacing: 0.5px;
}
.menu-hr {
    height: 1px;
    background: #eee;
    margin: 5px 10px;
}
.drop-item {
    display: block;
    padding: 10px 20px;
    color: var(--text);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.1s;
}
.drop-item:hover {
    background: #f5f7fa;
    color: var(--primary);
}
.drop-item.active {
    color: var(--primary);
    background: #e8f0fe;
    font-weight: 600;
}

/* ===== 设置菜单（右侧弹出） ===== */
.drop-menu-right {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    min-width: 160px;
    background: #fff;
    border-radius: 0 0 10px 10px;
    box-shadow: 0 8px 28px rgba(0,0,0,0.2);
    z-index: 1001;
    padding: 6px 0;
    overflow: hidden;
}
.drop-menu-right.open {
    display: block;
}

/* ========== 手机全屏导航 ========== */
.fullscreen-nav {
    display: none;
    position: fixed;
    top: var(--topbar-h); left: 0; right: 0; bottom: 0;
    background: var(--topbar-bg);
    z-index: 999;
    overflow-y: auto;
    padding: 10px 0 40px;
}
.fullscreen-nav.open {
    display: block;
}
.full-group {
    padding: 18px 24px 6px;
    font-size: 12px;
    font-weight: 700;
    color: rgba(255,255,255,0.35);
    letter-spacing: 1px;
}
.full-hr {
    height: 1px;
    background: rgba(255,255,255,0.08);
    margin: 6px 16px;
}
.full-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 24px;
    color: var(--topbar-text);
    text-decoration: none;
    font-size: 15px;
    transition: all 0.12s;
}
.full-item:hover {
    color: #fff;
    background: rgba(255,255,255,0.06);
}

/* ========== 内容区 ========== */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}
.content-body {
    padding: 20px;
    flex: 1;
}
.content-iframe {
    flex: 1;
    width: 100%;
    height: calc(100vh - var(--topbar-h));
    border: none;
    background: var(--bg);
}

/* ========== 卡片 ========== */
.card {
    background: var(--card-bg);
    border-radius: 6px;
    border: 1px solid var(--border);
    margin-bottom: 16px;
}
.card-header {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    font-weight: 600;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.card-body { padding: 16px; }

/* ========== 表格 ========== */
.table-wrapper { overflow-x: auto; }
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}
table th {
    background: #f8f9fa;
    padding: 10px 12px;
    text-align: right;
    font-weight: 600;
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
}
table td {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
    text-align: right;
}
table tr:hover { background: #f8f9fa; }

/* ========== 表单 ========== */
.form-group { margin-bottom: 14px; }
.form-group label {
    display: block;
    margin-bottom: 4px;
    font-weight: 600;
    font-size: 13px;
    color: var(--text-light);
}
.form-control {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 14px;
    font-family: var(--font);
    transition: border-color 0.2s;
}
.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(26,115,232,0.15);
}
select.form-control { appearance: auto; }
textarea.form-control { min-height: 80px; resize: vertical; }
.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
}

/* ========== 按钮 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    gap: 4px;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: #218838; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #c82333; }
.btn-warning { background: var(--warning); color: #212529; }
.btn-warning:hover { background: #e0a800; }
.btn-outline { background: #fff; color: var(--primary); border: 1px solid var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn + .btn { margin-left: 6px; }

/* ========== 搜索栏 ========== */
.search-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}
.search-bar .form-control { width: auto; min-width: 150px; }
.search-bar input[type="date"] { min-width: 140px; }

/* ========== 分页 ========== */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 16px 0;
}
.pagination button {
    padding: 6px 12px;
    border: 1px solid var(--border);
    background: #fff;
    border-radius: 4px;
    cursor: pointer;
    font-size: 13px;
}
.pagination button:hover:not(:disabled) { background: var(--primary); color: #fff; border-color: var(--primary); }
.pagination button:disabled { opacity: 0.5; cursor: not-allowed; }
.pagination .page-info { padding: 0 12px; font-size: 13px; color: var(--text-light); }

/* ========== 弹窗 ========== */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 2000;
    justify-content: center;
    align-items: center;
}
.modal-overlay.show { display: flex; }
.modal {
    background: #fff;
    border-radius: 8px;
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
}
.modal-header {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.modal-header h4 { font-size: 15px; }
.modal-close { background: none; border: none; font-size: 22px; cursor: pointer; color: var(--text-light); padding: 0 4px; line-height: 1; }
.modal-close:hover { color: var(--text); }
.modal-body { padding: 16px; overflow-y: auto; flex: 1; }
.modal-footer {
    padding: 12px 16px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

/* ========== 提示 ========== */
.alert { padding: 10px 14px; border-radius: 4px; margin-bottom: 12px; font-size: 13px; }
.alert-success { background: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
.alert-danger { background: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }
.alert-info { background: #d1ecf1; color: #0c5460; border: 1px solid #bee5eb; }
.alert-warning { background: #fff3cd; color: #856404; border: 1px solid #ffeeba; }

/* ========== 加载 ========== */
.loading { text-align: center; padding: 40px; color: var(--text-light); }
.loading::after { content: "加载中..."; }
.empty-state { text-align: center; padding: 40px; color: var(--text-light); }

/* ========== 统计卡片 ========== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}
.stat-card {
    background: #fff;
    border-radius: 6px;
    padding: 20px;
    border: 1px solid var(--border);
    text-align: center;
}
.stat-card .stat-value { font-size: 28px; font-weight: 700; color: var(--primary); }
.stat-card .stat-label { font-size: 13px; color: var(--text-light); margin-top: 4px; }

/* ========== 杂项 ========== */
.action-group { white-space: nowrap; }
.detail-table { width: 100%; border-collapse: collapse; margin-top: 8px; }
.detail-table th { background: #f0f2f5; padding: 6px 10px; text-align: right; font-size: 12px; border-bottom: 1px solid var(--border); }
.detail-table td { padding: 6px 10px; border-bottom: 1px solid var(--border); font-size: 13px; text-align: right; }
.badge { display: inline-block; padding: 2px 8px; border-radius: 10px; font-size: 11px; font-weight: 600; }
.badge-success { background: #d4edda; color: #155724; }
.badge-danger { background: #f8d7da; color: #721c24; }
.badge-warning { background: #fff3cd; color: #856404; }
.badge-info { background: #d1ecf1; color: #0c5460; }

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .topbar-toggle { display: flex; }
    .topbar { padding: 0 4px; }
    .topbar-item { padding: 0 12px; font-size: 13px; }
    .content-body { padding: 10px; }
    .fullscreen-nav { display: block; }

    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 8px; }
    .table-wrapper { overflow-x: auto; }
    .table-wrapper table { font-size: 12px; }
    .table-wrapper th, .table-wrapper td { padding: 6px 4px; }
    .form-row { flex-direction: column; }
    .form-row .form-group { flex: 1 1 100%; }
    .modal { width: 95% !important; margin: 10px auto; }
    .pagination button { padding: 4px 8px; font-size: 12px; }
    .search-bar { flex-wrap: wrap; gap: 4px; }
    .search-bar .form-control { min-width: 100px !important; flex: 1; }
    .card { margin: 4px 0 !important; }
}

@media (min-width: 769px) {
    .topbar-toggle { display: none !important; }
    .fullscreen-nav.open { display: none !important; }
}

/* 首列冻结 */
.table-wrapper{overflow-x:auto;}
.table-wrapper table th:first-child,.table-wrapper table td:first-child{position:sticky;left:0;z-index:2;background:#fff;}
.table-wrapper table th:first-child{z-index:3;background:#f8f9fa;}
.table-wrapper table td:first-child{border-right:2px solid #e0e0e0;}