:root{
  --bg:#f5f7fb; --card:#fff; --ink:#1f2733; --muted:#7a8699; --line:#eef1f6;
  --brand:#2f6bff; --brand-d:#1f50d6; --brand-soft:#eaf1ff;
  --ok:#1aa86b; --warn:#e08a00; --bad:#d8453b;
  --radius:12px; --shadow:0 2px 10px rgba(20,30,60,.06); --shadow-lg:0 8px 28px rgba(20,30,60,.1);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:-apple-system,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  background:var(--bg);color:var(--ink);font-size:14px;line-height:1.6;-webkit-font-smoothing:antialiased}

/* 顶部 */
.topbar{height:60px;background:var(--card);border-bottom:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;padding:0 20px;
  position:fixed;top:0;left:0;right:0;z-index:30}
.topbar-left{display:flex;align-items:center;gap:14px}
.brand{display:flex;align-items:center;gap:8px;font-weight:800;font-size:16px;color:var(--brand);text-decoration:none}
.brand img.brand-logo{width:26px;height:29px;display:block}
.brand em{font-style:normal;color:var(--muted);font-weight:600;font-size:13px}
.admin-tag{background:#1f2733;color:#fff;font-size:12px;font-weight:700;padding:3px 10px;border-radius:6px}
.topbar-right{display:flex;align-items:center;gap:16px}
.admin-email{color:var(--ink);font-size:13px;font-weight:600;max-width:220px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.top-link{color:var(--muted);font-size:13px}
.top-link:hover{color:var(--brand)}
/* 运营后台顶部「使用教程」做成醒目的品牌胶囊按钮 */
.top-link.tutorial-pill{display:inline-flex;align-items:center;gap:5px;background:var(--brand);color:#fff;font-weight:700;padding:6px 14px;border-radius:99px;box-shadow:0 3px 10px rgba(47,107,255,.25)}
.top-link.tutorial-pill:hover{background:var(--brand-d);color:#fff;text-decoration:none}
.top-link.tutorial-pill svg{width:14px;height:14px}

/* 布局 */
.layout{display:flex;min-height:100vh;padding-top:60px}
.sidebar{width:220px;background:#fff;border-right:1px solid var(--line);padding:16px 12px;
  position:fixed;top:60px;left:0;bottom:0;overflow-y:auto;z-index:20}
.main{flex:1;margin-left:220px;padding:24px;min-width:0}

.nav-group{display:flex;flex-direction:column;gap:6px}
.nav-item{display:flex;align-items:center;gap:10px;width:100%;padding:10px 12px;border-radius:8px;
  border:none;background:transparent;color:var(--muted);font-size:14px;cursor:pointer;text-align:left}
.nav-item:hover{background:var(--bg);color:var(--ink)}
.nav-item.active{background:var(--brand-soft);color:var(--brand);font-weight:600}
.nav-item svg{flex-shrink:0}
.nav-badge{font-style:normal;font-size:11px;font-weight:700;min-width:18px;height:18px;line-height:18px;
  text-align:center;padding:0 5px;border-radius:99px;background:#ef4444;color:#fff;margin-left:auto}
.hidden{display:none !important}
.side-note{margin-top:18px;background:#f8fafc;border:1px solid var(--line);border-radius:var(--radius);
  padding:12px;font-size:12px;color:var(--muted);line-height:1.6}
.side-note b{display:block;color:var(--ink);font-size:13px;margin-bottom:4px}

/* 视图 */
.view{display:none;animation:fade .2s ease}
.view.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
.page-hd{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:18px}
.page-hd h1{margin:0;font-size:20px;font-weight:800}
.muted{color:var(--muted);font-size:13px}

/* 统计卡 */
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:20px}
.stat-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:16px 18px;box-shadow:var(--shadow)}
.stat-label{color:var(--muted);font-size:12px;font-weight:600;margin-bottom:6px}
.stat-value{font-size:26px;font-weight:900;line-height:1.2}
.stat-sub{color:var(--muted);font-size:12px;margin-top:4px}
.stat-value.c-brand{color:var(--brand)}
.stat-value.c-ok{color:var(--ok)}
.stat-value.c-warn{color:var(--warn)}

/* 面板 */
.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:20px;box-shadow:var(--shadow);margin-bottom:20px}
.panel-hd{display:flex;align-items:center;gap:12px;margin-bottom:16px;flex-wrap:wrap}
.panel-hd h2{margin:0;font-size:16px;font-weight:700}

/* 按钮 / 表单 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:9px 16px;
  border-radius:8px;font-size:13px;font-weight:600;cursor:pointer;border:1px solid transparent;transition:.15s}
.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff}
.btn.primary:hover{background:var(--brand-d)}
.btn.default{background:#fff;border-color:var(--line);color:var(--ink)}
.btn.default:hover{border-color:var(--brand);color:var(--brand)}
.btn.danger{background:#fff;border-color:#fecaca;color:var(--bad)}
.btn.danger:hover{background:#fef2f2}
.btn.small{padding:6px 11px;font-size:12px}
.btn:disabled{opacity:.5;cursor:default}
input[type=text],input[type=number],input[type=datetime-local],select{
  width:100%;height:40px;padding:0 11px;border:1px solid var(--line);border-radius:8px;font-size:13px;
  outline:none;background:#fff;color:var(--ink);font-family:inherit;line-height:1.4}
input:focus,select:focus{border-color:var(--brand)}
textarea{border:1px solid var(--line);border-radius:8px;font-family:inherit;font-size:13px;padding:9px 11px;outline:none;width:100%;box-sizing:border-box;resize:vertical}
textarea:focus{border-color:var(--brand)}
.filter-bar{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:16px}
.filter-bar input[type=text]{max-width:260px}
.filter-bar select{max-width:180px;width:auto}

/* 表格 */
.table-wrap{overflow-x:auto}
.data-table{width:100%;border-collapse:collapse;font-size:13px}
.data-table th{text-align:left;padding:11px 12px;border-bottom:1px solid var(--line);color:var(--muted);
  font-weight:600;background:#fafbfc;white-space:nowrap}
.data-table td{padding:12px;border-bottom:1px solid var(--line);vertical-align:middle}
.data-table tr:hover td{background:#fafbfc}
.data-table .empty{text-align:center;color:var(--muted);padding:36px 12px}
.data-table .ops{display:flex;gap:6px;flex-wrap:wrap}
.pagination-bar{margin-top:12px}

/* 徽章 */
.tag{display:inline-flex;align-items:center;gap:4px;font-size:12px;padding:2px 9px;border-radius:99px;font-weight:600;white-space:nowrap}
.tag.ok{background:#e3f7ee;color:var(--ok)}
.tag.warn{background:#fff4e0;color:var(--warn)}
.tag.bad{background:#fdeceb;color:var(--bad)}
.tag.info{background:var(--brand-soft);color:var(--brand)}
.tag.gray{background:#f1f5f9;color:var(--muted)}
.tag.dark{background:#1f2733;color:#fff}
.dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:currentColor}
.sub-line{color:var(--muted);font-size:12px;margin-top:2px}

/* 弹窗 */
.modal{position:fixed;inset:0;background:rgba(15,23,42,.45);display:none;align-items:center;
  justify-content:center;z-index:50;padding:16px}
.modal.show{display:flex}
.modal-box{background:#fff;border-radius:14px;padding:22px;max-width:440px;width:100%;
  box-shadow:0 20px 60px rgba(0,0,0,.25);max-height:88vh;overflow-y:auto}
.modal-box.wide{max-width:640px}
.modal-hd{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}
.modal-hd h3{margin:0;font-size:16px}
.modal-close{background:transparent;border:none;font-size:22px;color:var(--muted);cursor:pointer;line-height:1}
.modal-close:hover{color:var(--brand)}
.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:18px}
.msg{margin-top:10px;font-size:13px;min-height:18px}
.msg.ok{color:var(--ok)} .msg.err{color:var(--bad)}

/* 表单网格 */
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;align-items:start}
.form-grid label{display:flex;flex-direction:column;gap:6px;font-size:13px;color:var(--muted);font-weight:600;min-width:0}
.form-grid label.full{grid-column:1/-1}
.form-grid label.inline{flex-direction:row;align-items:center;gap:8px;color:var(--ink)}
.form-grid .req{color:var(--bad)}
.form-grid .field-hint{font-weight:400;font-size:12px;color:var(--muted);line-height:1.5}
.form-grid .field-hint b{color:var(--ink);font-weight:600}
/* 「不显示的板块」复选框组 */
.chk-group{display:flex;flex-wrap:wrap;gap:8px 14px;border:1px solid var(--line);border-radius:8px;padding:10px 12px}
.chk-group .chk{display:flex;align-items:center;gap:6px;font-size:13px;font-weight:400;color:var(--ink);cursor:pointer;white-space:nowrap}
.chk-group .chk input{accent-color:var(--brand);margin:0}

/* 图片地址：尺寸提示 + 实时预览 */
.img-preview{margin-top:2px}
.img-preview img{max-width:100%;max-height:130px;display:block;border:1px solid var(--line);
  border-radius:8px;background:#fafbfc}
.img-preview .ip-meta{font-size:12px;font-weight:400;color:var(--muted);margin-top:6px;line-height:1.5}
.img-preview .ip-meta b{color:var(--ink)}
.ip-ok{color:var(--ok)!important} .ip-warn{color:var(--warn)!important} .ip-bad{color:var(--bad)!important}
.op-block{display:flex;flex-direction:column;gap:14px}
.op-row{display:flex;flex-direction:column;gap:6px}
.op-row>span{font-size:13px;font-weight:600;color:var(--ink)}
.op-row .hint{font-size:12px;color:var(--muted);font-weight:400}
.op-inline{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.op-inline select,.op-inline input{max-width:180px}
.op-divider{height:1px;background:var(--line);margin:2px 0}

/* 无权限 */
.deny{position:fixed;inset:0;background:var(--bg);display:flex;align-items:center;justify-content:center;z-index:80}
.deny-box{background:#fff;border:1px solid var(--line);border-radius:16px;padding:40px 48px;text-align:center;
  box-shadow:var(--shadow-lg);max-width:380px}
.deny-ic{font-size:40px}
.deny-box h2{margin:12px 0 8px;font-size:18px}
.deny-box p{color:var(--muted);font-size:13px;margin:0 0 20px}

/* 用户反馈详情 */
.detail-box{background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:12px 14px;
  font-size:13px;line-height:1.7;white-space:pre-wrap;word-break:break-word;max-height:280px;overflow-y:auto}
#fb-detail-meta{font-size:13px;line-height:1.7}
#fb-detail-meta b{color:var(--ink)}
.fb-prev-reply{background:#f5f8ff;border-color:#c7d7f7;border-left:3px solid var(--brand);
  border-radius:0 10px 10px 0;color:var(--ink)}
.fb-reply-row{font-size:11.5px;color:var(--muted);margin-top:4px}

@media (max-width:1100px){ .stat-grid{grid-template-columns:repeat(2,1fr)} }
@media (max-width:860px){
  .sidebar{display:none}
  .main{margin-left:0}
  .stat-grid{grid-template-columns:1fr}
  .form-grid{grid-template-columns:1fr}
  .top-link,.admin-email{display:none}
}