:root{
  --primary:#4F6B9A; --primary-d:#3d5478; --bg:#F4F5F7; --card:#fff;
  --border:#E2E4E8; --text:#1F2430; --muted:#6B7280; --success:#2E7D57; --danger:#C0454B; --warn:#9A6A2F;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text);font-size:14px}
button{font-family:inherit}
input,select,textarea{font-family:inherit;font-size:14px;padding:7px 10px;border:1px solid var(--border);border-radius:6px;background:#fff;color:var(--text);outline:none}
input:focus,select:focus,textarea:focus{border-color:var(--primary)}
textarea{resize:vertical;min-height:60px}

/* 登录 */
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#2b3b57,#4F6B9A)}
.login-card{background:#fff;padding:36px 34px;border-radius:12px;width:340px;box-shadow:0 18px 50px rgba(0,0,0,.28)}
.login-title{font-size:20px;font-weight:700;color:var(--primary-d);text-align:center}
.login-sub{font-size:12.5px;color:var(--muted);text-align:center;margin:6px 0 24px}
.login-card input{width:100%;margin-bottom:12px}
.login-error{color:var(--danger);font-size:13px;min-height:18px;margin-bottom:8px;text-align:center}
.login-tip{font-size:12px;color:var(--muted);text-align:center;margin-top:14px}

/* 布局 */
.layout{display:flex;min-height:100vh}
.sidebar{width:210px;background:#1E2A38;color:#dfe5ec;display:flex;flex-direction:column;position:sticky;top:0;height:100vh}
.brand{padding:20px 18px;font-size:16px;font-weight:700;color:#fff;border-bottom:1px solid #2c3a4d}
.nav{flex:1;padding:10px 0;overflow-y:auto}
.nav-item{padding:11px 18px;cursor:pointer;font-size:14px;color:#c6cfd9;border-left:3px solid transparent;transition:.15s}
.nav-item:hover{background:#263445;color:#fff}
.nav-item.active{background:#2c3a4d;color:#fff;border-left-color:var(--primary)}
.sidebar-foot{padding:14px 16px;border-top:1px solid #2c3a4d}
.user-info{font-size:12.5px;color:#aeb8c4;margin-bottom:8px}
.main{flex:1;padding:22px 26px;overflow-x:hidden}
.page-title{font-size:20px;font-weight:700;margin-bottom:18px}
.content{max-width:1200px}

/* 按钮 */
.btn{border:none;border-radius:6px;padding:8px 16px;cursor:pointer;font-size:14px;transition:.15s}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-d)}
.btn-success{background:var(--success);color:#fff}
.btn-danger{background:var(--danger);color:#fff}
.btn-ghost{background:transparent;color:#aeb8c4;border:1px solid #3a4857;padding:5px 10px;font-size:12.5px}
.btn-ghost:hover{color:#fff;border-color:#6b7a8c}
.btn-small{padding:5px 10px;font-size:12.5px}
.btn-block{width:100%}
.btn-outline{background:#fff;border:1px solid var(--border);color:var(--text)}
.btn-outline:hover{border-color:var(--primary);color:var(--primary)}

/* 卡片与工具栏 */
.card{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:18px;margin-bottom:18px}
.toolbar{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-bottom:16px}
.toolbar .grow{flex:1}
.spacer{flex:1}

/* 表格 */
table{width:100%;border-collapse:collapse;background:#fff;border-radius:8px;overflow:hidden}
th,td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--border);font-size:13.5px}
th{background:#F3F4F6;font-weight:600;color:#4b5563;white-space:nowrap}
tr:hover td{background:#F8F9FB}
.td-actions{white-space:nowrap}
.td-actions button{margin-right:6px}
.tag{display:inline-block;padding:2px 9px;border-radius:12px;font-size:12px;font-weight:500}
.tag-wholesale{background:#E7EFF9;color:var(--primary)}
.tag-retail{background:#EAF6EF;color:var(--success)}
.tag-warn{background:#FDF3E4;color:var(--warn)}
.tag-danger{background:#FBEAEA;color:var(--danger)}
.tag-ok{background:#EAF6EF;color:var(--success)}
.empty{padding:40px;text-align:center;color:var(--muted)}

/* 看板 */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:14px;margin-bottom:20px}
.stat-card{background:#fff;border:1px solid var(--border);border-radius:10px;padding:18px}
.stat-card .label{font-size:13px;color:var(--muted)}
.stat-card .value{font-size:24px;font-weight:700;margin-top:6px;color:var(--primary-d)}
.stat-card .value.green{color:var(--success)}
.stat-card .value.red{color:var(--danger)}

/* 表单 */
.form-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px}
.form-item{display:flex;flex-direction:column;gap:5px}
.form-item label{font-size:13px;color:var(--muted);font-weight:500}
.form-section-title{font-size:15px;font-weight:600;margin:20px 0 12px;padding-bottom:6px;border-bottom:1px solid var(--border)}
.hint{font-size:12px;color:var(--muted)}

/* 模态 */
.modal-mask{position:fixed;inset:0;background:rgba(20,25,35,.45);display:flex;align-items:flex-start;justify-content:center;padding:40px 16px;z-index:100}
.modal{background:#fff;border-radius:12px;width:100%;max-width:720px;max-height:90vh;overflow-y:auto;padding:22px}
.modal-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}
.modal-title{font-size:17px;font-weight:700}
.modal-close{background:none;border:none;font-size:22px;cursor:pointer;color:var(--muted);line-height:1}
.modal-foot{display:flex;justify-content:flex-end;gap:10px;margin-top:20px}

/* 打印 */
@media print{
  .no-print{display:none !important}
  body{background:#fff}
}

/* 报表汇总 */
.report-total{font-size:15px;font-weight:600;margin:12px 0;color:var(--primary-d)}

@media(max-width:720px){
  .layout{flex-direction:column}
  .sidebar{width:100%;height:auto;position:static;flex-direction:row;flex-wrap:wrap;align-items:center}
  .brand{padding:12px;font-size:14px;border-bottom:none}
  .nav{display:flex;flex-wrap:wrap;padding:6px}
  .nav-item{padding:8px 12px}
  .sidebar-foot{margin-left:auto}
  .main{padding:14px}
}