:root{
  --blue:#3D7CFF; --blue-dark:#2C5FD6; --bg:#f4f6fa; --card:#fff;
  --text:#1f2733; --sub:#6b7686; --line:#e6eaf0; --danger:#ef4444; --ok:#10b981; --warn:#f59e0b;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;}
html,body{margin:0;padding:0;}
body{font-family:-apple-system,'PingFang SC','Microsoft YaHei',sans-serif;
  background:var(--bg);color:var(--text);font-size:15px;line-height:1.6;}
.hidden{display:none !important;}
button{font-family:inherit;cursor:pointer;}
input,select{font-family:inherit;font-size:15px;}

/* ---------- 登录 ---------- */
.login{min-height:100vh;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,#3D7CFF,#5a93ff);padding:20px;}
.login-card{width:100%;max-width:360px;background:#fff;border-radius:18px;padding:32px 24px;
  box-shadow:0 12px 40px rgba(20,40,80,.18);}
.login-logo{font-size:30px;font-weight:800;color:var(--blue);text-align:center;letter-spacing:2px;}
.login-sub{text-align:center;color:var(--sub);margin:4px 0 24px;font-size:13px;}
.login-tip{margin-top:14px;font-size:12px;color:var(--sub);text-align:center;}

/* ---------- 表单控件 ---------- */
.field{width:100%;border:1px solid var(--line);border-radius:10px;padding:12px 14px;margin:6px 0 12px;
  background:#fbfcfe;outline:none;transition:border-color .15s;}
.field:focus{border-color:var(--blue);background:#fff;}
.field.textarea{resize:vertical;min-height:88px;line-height:1.5;}
.form-label{font-size:13px;color:var(--sub);margin-top:4px;display:block;}
.form-row{display:flex;gap:12px;}
.form-row>div{flex:1;}

.btn-primary{width:100%;background:var(--blue);color:#fff;border:none;border-radius:10px;
  padding:13px;font-size:16px;font-weight:600;margin-top:8px;}
.btn-primary.sm{width:auto;padding:8px 14px;font-size:14px;margin:0;}
.btn-primary:active{background:var(--blue-dark);}

/* ---------- 顶栏 ---------- */
.app{min-height:100vh;}
.topbar{position:sticky;top:0;z-index:30;display:flex;align-items:center;gap:10px;
  background:#fff;border-bottom:1px solid var(--line);padding:10px 14px;
  padding-top:calc(10px + env(safe-area-inset-top));}
.topbar-title{font-weight:700;font-size:16px;flex:1;}
.icon-btn{background:none;border:none;font-size:20px;color:var(--text);padding:4px 8px;border-radius:8px;}
.icon-btn:active{background:var(--bg);}
.avatar{width:34px;height:34px;border-radius:50%;background:var(--blue);color:#fff;
  display:inline-flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;}

/* ---------- 抽屉导航（移动端默认隐藏） ---------- */
.mask{position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:40;}
.drawer{position:fixed;top:0;left:0;bottom:0;width:78%;max-width:300px;background:#fff;z-index:50;
  transform:translateX(-100%);transition:transform .25s ease;display:flex;flex-direction:column;
  box-shadow:2px 0 16px rgba(0,0,0,.12);}
.drawer.open{transform:translateX(0);}
.drawer-head{display:flex;align-items:center;gap:10px;padding:18px 16px;border-bottom:1px solid var(--line);}
.drawer-name{font-weight:700;}
.drawer-role{font-size:12px;color:var(--sub);}
.drawer-head .close{margin-left:auto;}
.nav{padding:8px;overflow-y:auto;}
.nav-item{display:block;padding:14px 16px;border-radius:10px;color:var(--text);font-size:15px;
  margin:2px 0;text-decoration:none;cursor:pointer;}
.nav-item:active{background:var(--bg);}
.nav-item.active{background:var(--blue);color:#fff;font-weight:600;}

/* ---------- 内容区 ---------- */
.content{padding:14px;max-width:1100px;margin:0 auto;}
.view-title{font-size:19px;margin:6px 0 14px;}
.view-bar{display:flex;align-items:center;justify-content:space-between;margin:6px 0 14px;}
.view-bar .view-title{margin:0;}
.export-bar{display:flex;align-items:center;gap:6px;}
.export-bar select.field.sm{padding:8px 10px;height:auto;font-size:14px;line-height:1.4;}
.hint{font-size:13px;color:var(--sub);margin:-6px 0 14px;}

/* ---------- 服务器连接失败全屏提示 ---------- */
.server-error{position:fixed;inset:0;background:var(--bg);z-index:999;display:flex;align-items:center;justify-content:center;}
.server-error-box{text-align:center;padding:30px;max-width:460px;}
.server-error-icon{font-size:46px;}
.server-error-title{font-size:18px;font-weight:700;margin:10px 0 6px;}
.server-error-msg{font-size:14px;color:var(--sub);margin-bottom:18px;word-break:break-all;}

/* ---------- 概览卡片 ---------- */
.stat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-bottom:16px;}
.stat{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px;text-align:center;}
.stat-num{font-size:26px;font-weight:800;color:var(--blue);}
.stat-label{font-size:12px;color:var(--sub);margin-top:4px;}

.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px;margin-bottom:14px;}
.card h3{margin:0 0 10px;font-size:15px;}

/* ---------- 列表卡片 ---------- */
.card-list{display:flex;flex-direction:column;gap:12px;}
.list-card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px;}
.list-card .lc-top{display:flex;justify-content:space-between;align-items:flex-start;gap:10px;}
.lc-title{font-weight:700;font-size:15px;flex:1;}
.lc-sub{font-size:13px;color:var(--sub);margin-top:4px;}
.lc-price{font-size:13px;color:var(--sub);margin-top:6px;}
.lc-price b{color:var(--danger);font-size:15px;}
.lc-actions{display:flex;gap:8px;margin-top:10px;flex-wrap:wrap;}
.mini-btn{border:1px solid var(--line);background:#fff;border-radius:8px;padding:7px 12px;font-size:13px;color:var(--text);}
.mini-btn.danger{color:var(--danger);border-color:#fcdcdc;}
.mini-btn.primary{color:var(--blue);border-color:#cfe0ff;}
.mini-btn.success{color:#1aad19;border-color:#cdeccd;}
/* 上架/下架切换：强区分语义色 */
.mini-btn.go{background:var(--ok);border-color:var(--ok);color:#fff;}        /* 上架：明确正向操作，绿实心 */
.mini-btn.go:active{background:#0e9e72;}
.mini-btn.off{background:#fff7ed;border-color:#fed7aa;color:#c2410c;}          /* 下架：警示色，橙黄 */
.mini-btn.off:active{background:#ffedd5;}

/* ---------- 标签 ---------- */
.tag{display:inline-flex;align-items:center;gap:5px;font-size:11px;padding:2px 8px;border-radius:10px;font-weight:600;white-space:nowrap;}
.tag .dot{width:6px;height:6px;border-radius:50%;background:currentColor;display:inline-block;}
.tag-ok{background:#ecfdf5;color:#047857;border:1px solid #a7f3d0;}
.tag-off{background:#f1f5f9;color:#64748b;border:1px solid #e2e8f0;}
.tag-warn{background:#fffbeb;color:#b45309;}
.tag-blue{background:#eef3ff;color:var(--blue-dark);}

/* ---------- 开关 ---------- */
.switch{position:relative;width:46px;height:26px;flex:0 0 auto;}
.switch input{opacity:0;width:0;height:0;}
.slider{position:absolute;inset:0;background:#cbd5e1;border-radius:20px;transition:.2s;}
.slider:before{content:"";position:absolute;width:20px;height:20px;left:3px;top:3px;background:#fff;
  border-radius:50%;transition:.2s;}
.switch input:checked + .slider{background:var(--ok);}
.switch input:checked + .slider:before{transform:translateX(20px);}

/* 尾款开关行 */
.toggle-row{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:10px;}
.toggle-row > span{font-size:14px;color:var(--text);}
.view-subtitle{font-size:16px;margin:2px 0 8px;}

/* ---------- 客服二维码 ---------- */
.qr-box{border:1px dashed var(--line);border-radius:12px;padding:14px;text-align:center;margin-top:10px;}
.qr-img{width:120px;height:120px;background:#f1f5f9;border-radius:8px;display:inline-flex;
  align-items:center;justify-content:center;color:var(--sub);font-size:12px;}
.qr-preview{width:120px;height:120px;object-fit:cover;border-radius:8px;}

/* ---------- 订单 tabs ---------- */
.tabs{display:flex;gap:8px;overflow-x:auto;padding-bottom:8px;margin-bottom:12px;-webkit-overflow-scrolling:touch;}
.tab{flex:0 0 auto;border:1px solid var(--line);background:#fff;border-radius:20px;padding:7px 16px;font-size:13px;color:var(--sub);}
.tab.active{background:var(--blue);color:#fff;border-color:var(--blue);}

/* ---------- 课程表单 sheet ---------- */
.sheet-mask{position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:60;display:flex;align-items:flex-end;}
.sheet{width:100%;background:#fff;border-radius:18px 18px 0 0;max-height:92vh;overflow-y:auto;
  padding:16px 18px calc(18px + env(safe-area-inset-bottom));animation:slideUp .25s ease;}
@keyframes slideUp{from{transform:translateY(100%);}to{transform:translateY(0);}}
.sheet-head{display:flex;justify-content:space-between;align-items:center;font-weight:700;font-size:16px;margin-bottom:12px;}
.sheet-body{padding-bottom:10px;}
.balance-box{background:#eef3ff;color:var(--blue-dark);border-radius:10px;padding:12px;font-size:14px;margin:6px 0 14px;}
.balance-box b{font-size:17px;}

/* ---------- 图片上传 ---------- */
.img-uploader{margin:6px 0 12px;}
.img-preview{width:100%;height:120px;border:1.5px dashed var(--line);border-radius:12px;
  display:flex;align-items:center;justify-content:center;color:var(--sub);font-size:14px;
  background:#fbfcfe;cursor:pointer;overflow:hidden;position:relative;}
.img-placeholder{font-size:14px;}
.img-thumb{width:100%;height:100%;object-fit:cover;border-radius:12px;}
.img-del{position:absolute;top:4px;right:4px;width:22px;height:22px;border-radius:50%;
  background:rgba(0,0,0,.55);color:#fff;font-size:15px;line-height:22px;text-align:center;cursor:pointer;}
.gallery-box{display:flex;flex-wrap:wrap;gap:10px;margin:6px 0 8px;}
.gallery-box .g-item{position:relative;width:90px;height:90px;border-radius:12px;overflow:hidden;
  border:1px solid var(--line);}
.gallery-box .g-item .img-thumb{width:100%;height:100%;object-fit:cover;}
.editor-toolbar{margin:6px 0 4px;}
.btn-ghost{background:#fff;border:1px solid var(--line);border-radius:10px;color:var(--text);
  padding:8px 14px;font-size:14px;}
.btn-ghost:active{background:var(--bg);}
.btn-ghost.sm{width:auto;padding:8px 14px;font-size:14px;margin:0 0 6px;}
.btn-ghost.sm.danger{color:var(--danger);border-color:#fcdcdc;}
.form-hint{font-size:12px;color:var(--sub);margin-top:4px;}

/* ---------- 搜索栏 ---------- */
.search-bar{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:12px;margin-bottom:14px;}
.search-bar .field{margin:4px 0;}
.search-row{display:flex;gap:10px;}
.search-row .field{flex:1;}

/* ---------- 富文本编辑器 ---------- */
.editor-wrap{border:1px solid var(--line);border-radius:12px;overflow:hidden;margin:6px 0 12px;background:#fff;}
.editor-toolbar{display:flex;gap:6px;flex-wrap:wrap;padding:8px 10px;border-bottom:1px solid var(--line);background:#f8fafc;}
.editor{min-height:140px;padding:12px 14px;font-size:15px;line-height:1.7;outline:none;overflow-y:auto;max-height:360px;}
.editor:empty::before{content:attr(data-placeholder);color:#aaa;pointer-events:none;}
.editor img{max-width:100%;border-radius:8px;margin:6px 0;}
.editor ul,.editor ol{padding-left:22px;}

/* ---------- 地址定位 ---------- */
.locate-row{display:flex;align-items:center;gap:10px;margin:8px 0 6px;}
.locate-status{font-size:13px;color:var(--ok);}
.address-map-row{display:flex;gap:12px;align-items:stretch;margin:6px 0 12px;}
.address-input-col{flex:1;display:flex;flex-direction:column;}
.address-input-col .hint{font-size:12px;color:var(--sub);margin-top:4px;}
.map-container{flex:1.2;min-height:180px;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#f1f5f9;position:relative;}
.map-placeholder{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;text-align:center;color:var(--sub);font-size:13px;padding:20px;}
@media (max-width: 767px) {
  .address-map-row{flex-direction:column;}
  .map-container{min-height:220px;}
}

/* ---------- 课程列表封面/图集 ---------- */
.lc-title-row{display:flex;align-items:center;gap:10px;flex:1;}
.lc-cover{width:48px;height:48px;border-radius:8px;object-fit:cover;flex:0 0 auto;}
.lc-gallery{display:flex;gap:6px;margin-top:8px;flex-wrap:wrap;align-items:center;}
.lc-g-thumb{width:44px;height:44px;border-radius:6px;object-fit:cover;border:1px solid var(--line);}
.lc-g-more{font-size:12px;color:var(--sub);padding:0 4px;}

/* ---------- 桌面端适配（>=768px） ---------- */
@media (min-width:768px){
  .topbar{padding-left:18px;}
  .icon-btn[aria-label="菜单"]{display:none;}
  .mask{display:none !important;}
  .drawer{transform:translateX(0);width:240px;box-shadow:none;border-right:1px solid var(--line);}
  .drawer .close{display:none;}
  .content{margin-left:240px;padding:24px;}
  .stat-grid{grid-template-columns:repeat(4,1fr);}
  .sheet-mask{align-items:center;}
  .sheet{width:480px;max-width:92vw;border-radius:18px;}
  .card-list{grid-template-columns:repeat(2,1fr);}
  .card-list{display:grid;}
}