/* ============= 全局重置 ============= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

:root {
    --primary: #4f7df9;
    --primary-light: #eaf1ff;
    --primary-dark: #2e5fd5;
    --success: #28c76f;
    --warning: #ff9f43;
    --danger: #ea5455;
    --info: #00bcd4;
    --text-1: #2c3e50;
    --text-2: #6c7a89;
    --text-3: #a4b0be;
    --bg-1: #f5f7fb;
    --bg-2: #ffffff;
    --border: #ebeef5;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 32px rgba(0, 0, 0, 0.08);
    --radius: 8px;
    --radius-sm: 4px;
    --radius-lg: 14px;
}

html, body {
    font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg-1);
    color: var(--text-1);
    font-size: 14px;
    line-height: 1.6;
    min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; transition: .2s; }
a:hover { color: var(--primary-dark); }

/* ============= 登录页 ============= */
.login-wrap {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #4f7df9 0%, #6fb1fc 50%, #a8d4ff 100%);
    padding: 20px;
    position: relative;
    overflow: hidden;
}

.login-wrap::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    top: -200px;
    left: -200px;
}

.login-wrap::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 50%;
    bottom: -150px;
    right: -100px;
}

.login-box {
    background: #fff;
    border-radius: 16px;
    padding: 48px 40px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    position: relative;
    z-index: 1;
}

.login-logo {
    text-align: center;
    margin-bottom: 32px;
}

.login-logo .icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    background: var(--primary);
    color: #fff;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    box-shadow: 0 8px 20px rgba(79, 125, 249, 0.4);
}

.login-logo h1 {
    font-size: 22px;
    color: var(--text-1);
    margin-bottom: 4px;
}

.login-logo p {
    font-size: 13px;
    color: var(--text-2);
}

.form-group { margin-bottom: 18px; }
.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 13px;
    color: var(--text-2);
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 14px;
    background: #fff;
    transition: all .2s;
    font-family: inherit;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 125, 249, 0.15);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: all .2s;
    text-decoration: none;
    font-family: inherit;
    gap: 6px;
    white-space: nowrap;
}

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(79, 125, 249, 0.3); }

.btn-success { background: var(--success); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-warning { background: var(--warning); color: #fff; }
.btn-info { background: var(--info); color: #fff; }

.btn-default { background: #fff; color: var(--text-1); border: 1px solid var(--border); }
.btn-default:hover { background: var(--primary-light); color: var(--primary); border-color: var(--primary); }

.btn-sm { padding: 6px 12px; font-size: 12px; }
.btn-lg { padding: 14px 24px; font-size: 15px; }
.btn-block { width: 100%; }

.btn-login {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, var(--primary), #6fb1fc);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    margin-top: 12px;
    box-shadow: 0 6px 16px rgba(79, 125, 249, 0.3);
    transition: all .2s;
}

.btn-login:hover { transform: translateY(-1px); box-shadow: 0 8px 20px rgba(79, 125, 249, 0.4); }

.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 18px;
    font-size: 13px;
}

.alert-error { background: #fde8e8; color: #c0392b; border-left: 3px solid var(--danger); }
.alert-success { background: #e0f7ea; color: #218838; border-left: 3px solid var(--success); }
.alert-info { background: #e3f2fd; color: #1565c0; border-left: 3px solid var(--info); }

.login-tip {
    text-align: center;
    font-size: 12px;
    color: var(--text-3);
    margin-top: 18px;
}

/* ============= 主布局 ============= */
.app {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 240px;
    background: #fff;
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 100;
    transition: transform .3s;
}

.sidebar-header {
    padding: 18px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar-header .logo {
    width: 36px;
    height: 36px;
    background: var(--primary);
    color: #fff;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 16px;
}

.sidebar-header .title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-1);
}

.sidebar-header .sub {
    font-size: 11px;
    color: var(--text-3);
}

.nav-section {
    flex: 1;
    overflow-y: auto;
    padding: 12px 0;
}

.nav-group { margin-bottom: 4px; }

.nav-group-title {
    padding: 12px 20px 6px;
    font-size: 11px;
    color: var(--text-3);
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: .5px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 20px;
    color: var(--text-2);
    font-size: 14px;
    border-left: 3px solid transparent;
    transition: all .2s;
}

.nav-link:hover { background: var(--primary-light); color: var(--primary); }

.nav-link.active {
    background: var(--primary-light);
    color: var(--primary);
    border-left-color: var(--primary);
    font-weight: 500;
}

.nav-link .icon { font-size: 16px; width: 20px; text-align: center; }

.sidebar-footer {
    padding: 12px 20px;
    border-top: 1px solid var(--border);
    background: var(--bg-1);
    font-size: 12px;
    color: var(--text-2);
}

.main {
    flex: 1;
    margin-left: 240px;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.topbar {
    background: #fff;
    padding: 14px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 50;
}

.topbar-left { display: flex; align-items: center; gap: 16px; }

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: var(--text-1);
}

.page-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-1);
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-2);
}

.user-info .avatar {
    width: 32px;
    height: 32px;
    background: var(--primary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 500;
}

.content {
    padding: 24px;
    flex: 1;
}

/* ============= 卡片 ============= */
.card {
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    padding: 20px;
    margin-bottom: 16px;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 12px;
}

.card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-1);
}

.card-tools {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

/* ============= 统计卡片 ============= */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}

.stat-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
    transition: transform .2s;
}

.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }

.stat-card::before {
    content: '';
    position: absolute;
    top: 0; right: 0;
    width: 80px;
    height: 80px;
    background: var(--primary);
    opacity: 0.06;
    border-radius: 50%;
    transform: translate(30%, -30%);
}

.stat-label {
    font-size: 13px;
    color: var(--text-2);
    margin-bottom: 8px;
}

.stat-value {
    font-size: 26px;
    font-weight: 700;
    color: var(--text-1);
    line-height: 1.2;
}

.stat-foot {
    margin-top: 10px;
    font-size: 12px;
    color: var(--text-3);
}

.stat-icon {
    position: absolute;
    right: 20px;
    bottom: 20px;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.stat-card.success::before { background: var(--success); }
.stat-card.success .stat-icon { background: #d8f5e8; color: var(--success); }

.stat-card.warning::before { background: var(--warning); }
.stat-card.warning .stat-icon { background: #fff0d6; color: var(--warning); }

.stat-card.danger::before { background: var(--danger); }
.stat-card.danger .stat-icon { background: #fde8e8; color: var(--danger); }

/* ============= 表格 ============= */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.table th, .table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}

.table th {
    background: var(--bg-1);
    font-weight: 600;
    color: var(--text-2);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: .3px;
}

.table tbody tr:hover { background: var(--primary-light); }

.table .actions { display: flex; gap: 4px; flex-wrap: wrap; }

.empty-row td { text-align: center; color: var(--text-3); padding: 40px !important; }

/* ============= 标签 ============= */
.tag {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 500;
    background: var(--primary-light);
    color: var(--primary);
}

.tag-success { background: #d8f5e8; color: var(--success); }
.tag-warning { background: #fff0d6; color: #c47900; }
.tag-danger { background: #fde8e8; color: var(--danger); }
.tag-info { background: #d4f4f8; color: var(--info); }
.tag-default { background: var(--bg-1); color: var(--text-2); }

/* ============= 表单 ============= */
.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 14px;
    margin-bottom: 14px;
}

.form-actions {
    display: flex;
    gap: 10px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
    margin-top: 16px;
}

/* ============= 搜索筛选 ============= */
.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    margin-bottom: 16px;
}

.filter-bar .form-control { width: auto; min-width: 160px; }

/* ============= 分页 ============= */
.pagination {
    display: flex;
    gap: 6px;
    align-items: center;
    justify-content: center;
    margin-top: 20px;
    flex-wrap: wrap;
}

.pagination a, .pagination span {
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    background: #fff;
    border: 1px solid var(--border);
    color: var(--text-2);
    text-decoration: none;
    font-size: 13px;
}

.pagination a:hover { background: var(--primary-light); color: var(--primary); border-color: var(--primary); }
.pagination .active { background: var(--primary); color: #fff; border-color: var(--primary); }
.pagination .total { border: none; background: none; }

/* ============= 移动端适配 ============= */
@media (max-width: 1024px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.show { transform: translateX(0); }
    .main { margin-left: 0; }
    .menu-toggle { display: block; }
    .overlay-mask { position: fixed; inset: 0; background: rgba(0,0,0,0.4); z-index: 99; display: none; }
    .overlay-mask.show { display: block; }
}

@media (max-width: 768px) {
    .content { padding: 14px; }
    .topbar { padding: 12px 16px; }
    .page-title { font-size: 16px; }
    .stats-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
    .stat-card { padding: 14px; }
    .stat-value { font-size: 20px; }
    .stat-icon { width: 32px; height: 32px; font-size: 16px; }
    .form-row { grid-template-columns: 1fr; }
    .table th, .table td { padding: 8px; font-size: 12px; }
    .user-info .name { display: none; }
    .login-box { padding: 32px 24px; }
}

@media (max-width: 480px) {
    .stats-grid { grid-template-columns: 1fr; }
    .card { padding: 14px; }
}

/* ============= 工具类 ============= */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-primary { color: var(--primary); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.text-muted { color: var(--text-2); }

.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mt-2 { margin-top: 16px; }

.flex { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }

.hide-mobile { }
@media (max-width: 768px) {
    .hide-mobile { display: none !important; }
}

/* 模态对话框 */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}

.modal.show { display: flex; }

.modal-dialog {
    background: #fff;
    border-radius: var(--radius);
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title { font-size: 16px; font-weight: 600; }

.modal-close {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: var(--text-3);
}

.modal-body { padding: 20px; }
.modal-footer {
    padding: 12px 20px;
    border-top: 1px solid var(--border);
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

/* 销售单据布局 */
.sale-row { display: grid; grid-template-columns: 80px 1fr 100px 100px 100px 40px; gap: 8px; align-items: center; margin-bottom: 8px; }
.sale-row input, .sale-row select { width: 100%; }
.sale-row .num { width: 60px; }

@media (max-width: 768px) {
    .sale-row { grid-template-columns: 1fr; }
}

/* 简易开关 */
.switch {
    display: inline-block;
    width: 44px;
    height: 24px;
    background: #ccc;
    border-radius: 12px;
    position: relative;
    cursor: pointer;
    transition: .2s;
}
.switch::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    background: #fff;
    border-radius: 50%;
    top: 2px;
    left: 2px;
    transition: .2s;
}
.switch.on { background: var(--primary); }
.switch.on::after { left: 22px; }

/* 详情 */
.detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
}
.detail-item { padding: 8px 0; }
.detail-label { color: var(--text-2); font-size: 12px; margin-bottom: 4px; }
.detail-value { font-weight: 500; }

/* 简易条形图 */
.bar-chart {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    height: 200px;
    padding: 16px 0;
}
.bar-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}
.bar-fill {
    width: 100%;
    background: linear-gradient(180deg, var(--primary), #6fb1fc);
    border-radius: 4px 4px 0 0;
    min-height: 4px;
    transition: height .4s;
}
.bar-label { font-size: 11px; color: var(--text-2); }
.bar-value { font-size: 11px; color: var(--text-1); font-weight: 500; }