*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
:root{
  --primary:#4f6ef7;--primary-dark:#3b56d4;--bg:#f4f6fb;--card:#fff;
  --text:#2b3445;--muted:#8a94a6;--border:#e6e9f0;--danger:#e5484d;--success:#2e9e5b;--warning:#e8a13c;
}
html{-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text);font-size:14px}
.layout{display:flex;min-height:100vh}
.sidebar{width:220px;background:#1f2637;color:#cbd2e0;flex-shrink:0;position:sticky;top:0;height:100vh;overflow-y:auto}
.logo{padding:20px 18px;font-size:17px;font-weight:600;color:#fff;border-bottom:1px solid rgba(255,255,255,.08)}
.menu a{display:block;padding:13px 20px;color:#cbd2e0;text-decoration:none;font-size:14px;transition:.15s;border-left:3px solid transparent}
.menu a:hover{background:rgba(255,255,255,.06);color:#fff}
.menu a.active{background:rgba(79,110,247,.18);color:#fff;border-left-color:var(--primary)}
.main{flex:1;min-width:0;display:flex;flex-direction:column}
.topbar{height:56px;background:#fff;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 24px;position:sticky;top:0;z-index:10}
#pageTitle{font-size:17px;font-weight:600}
.time{color:var(--muted);font-size:13px}
.content{padding:24px;flex:1}

/* 统计卡片 */
.stats-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:16px;margin-bottom:24px}
.stat-card{background:var(--card);border-radius:12px;padding:18px;box-shadow:0 1px 3px rgba(0,0,0,.04)}
.stat-card .num{font-size:26px;font-weight:700;margin-top:6px}
.stat-card .label{color:var(--muted);font-size:13px}
.stat-card .icon{font-size:22px}
.stat-card.accent{background:linear-gradient(135deg,#4f6ef7,#7c5cf0);color:#fff}
.stat-card.accent .label{color:rgba(255,255,255,.85)}

/* 面板与工具栏 */
.panel{background:var(--card);border-radius:12px;padding:20px;box-shadow:0 1px 3px rgba(0,0,0,.04);margin-bottom:20px}
.panel h3{margin-bottom:16px;font-size:15px}
.toolbar{display:flex;gap:10px;margin-bottom:16px;flex-wrap:wrap;align-items:center}
.toolbar .spacer{flex:1}
.search{flex:1;min-width:180px;max-width:320px}

/* 表单 */
input,select,textarea{font-family:inherit;font-size:14px;padding:8px 12px;border:1px solid var(--border);border-radius:8px;outline:none;background:#fff;color:var(--text)}
input:focus,select:focus,textarea:focus{border-color:var(--primary)}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form-grid .full{grid-column:1/-1}
.form-item label{display:block;margin-bottom:6px;color:var(--muted);font-size:13px}
.form-item input,.form-item select,.form-item textarea{width:100%}
textarea{resize:vertical;min-height:70px}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:8px 16px;border:none;border-radius:8px;cursor:pointer;font-size:14px;transition:.15s;background:#eef1f7;color:var(--text);white-space:nowrap}
.btn:hover{opacity:.9}
.btn:active{opacity:.7}
.btn.primary{background:var(--primary);color:#fff}
.btn.danger{background:var(--danger);color:#fff}
.btn.success{background:var(--success);color:#fff}
.btn.warning{background:var(--warning);color:#fff}
.btn.sm{padding:5px 10px;font-size:12px}

/* 表格 */
table{width:100%;border-collapse:collapse}
th,td{padding:11px 12px;text-align:left;border-bottom:1px solid var(--border);font-size:13px}
th{color:var(--muted);font-weight:500;background:#fafbfd;white-space:nowrap}
tr:hover td{background:#f8f9fd}
.empty{padding:40px;text-align:center;color:var(--muted)}

/* 标签 */
.tag{display:inline-block;padding:2px 9px;border-radius:20px;font-size:12px}
.tag.blue{background:#e7edff;color:#3b56d4}
.tag.green{background:#e3f5ea;color:#2e9e5b}
.tag.orange{background:#fdf0df;color:#c47d1d}
.tag.red{background:#fde8e8;color:#d43b3b}
.tag.gray{background:#eef1f7;color:#8a94a6}

/* 分页 */
.pagination{display:flex;gap:8px;align-items:center;justify-content:flex-end;margin-top:16px;font-size:13px;color:var(--muted);flex-wrap:wrap}
.pagination button{padding:5px 11px;border:1px solid var(--border);background:#fff;border-radius:6px;cursor:pointer}
.pagination button:disabled{opacity:.4;cursor:not-allowed}

/* 弹窗 */
.modal-mask{position:fixed;inset:0;background:rgba(20,25,40,.45);display:flex;align-items:center;justify-content:center;z-index:100;padding:20px}
.modal{background:#fff;border-radius:14px;width:100%;max-width:640px;max-height:90vh;overflow-y:auto;display:flex;flex-direction:column}
.modal-head{display:flex;align-items:center;justify-content:space-between;padding:16px 22px;border-bottom:1px solid var(--border);font-size:16px;font-weight:600;position:sticky;top:0;background:#fff;z-index:1;flex-shrink:0}
.modal-head .close{border:none;background:none;font-size:22px;cursor:pointer;color:var(--muted);padding:4px;line-height:1}
.modal-body{padding:22px;flex:1;overflow-y:auto}
.modal-foot{display:flex;justify-content:flex-end;gap:10px;padding:14px 22px;border-top:1px solid var(--border);flex-shrink:0}

/* Toast */
.toast{position:fixed;top:20px;left:50%;transform:translateX(-50%);background:#2b3445;color:#fff;padding:11px 22px;border-radius:8px;z-index:200;display:none;font-size:14px;box-shadow:0 4px 16px rgba(0,0,0,.2);max-width:90vw;text-align:center}

/* 两栏布局 */
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.member-badge{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:16px}
.badge-item{background:#f4f6fb;border-radius:10px;padding:12px 18px;flex:1;min-width:120px}
.badge-item .v{font-size:20px;font-weight:700}
.badge-item .k{color:var(--muted);font-size:12px}

/* ===== 桌面端中等宽度 ===== */
@media(max-width:900px){
  .two-col{grid-template-columns:1fr}
  .form-grid{grid-template-columns:1fr}
}

/* ===== 移动端适配 ===== */
@media(max-width:768px){
  .layout{flex-direction:column}
  /* 侧边栏 → 顶部横向滚动导航 */
  .sidebar{width:100%;height:auto;position:sticky;top:0;z-index:20;overflow-x:auto;overflow-y:hidden;display:flex;flex-direction:column}
  .logo{padding:12px 16px;font-size:16px;border-bottom:1px solid rgba(255,255,255,.08)}
  .menu{display:flex;flex-wrap:nowrap;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none}
  .menu::-webkit-scrollbar{display:none}
  .menu a{flex-shrink:0;padding:12px 16px;border-left:none;border-bottom:3px solid transparent;font-size:14px}
  .menu a.active{border-bottom-color:var(--primary);background:rgba(79,110,247,.18)}

  /* 顶栏 */
  .topbar{height:48px;padding:0 16px}
  #pageTitle{font-size:16px}
  .time{font-size:12px}

  .content{padding:14px}

  /* 统计卡片 2 列 */
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:10px;margin-bottom:14px}
  .stat-card{padding:14px;border-radius:10px}
  .stat-card .num{font-size:22px}
  .stat-card .icon{font-size:18px}

  .panel{padding:14px;border-radius:10px;margin-bottom:14px}
  .two-col{gap:14px}

  /* 工具栏：搜索框占满一行 */
  .toolbar{gap:8px}
  .toolbar .spacer{display:none}
  .search{max-width:none;flex-basis:100%}
  .toolbar .btn{flex:1;min-height:40px}

  /* 按钮触控面积 */
  .btn{min-height:40px}
  .btn.sm{min-height:34px;padding:5px 12px}

  /* 表单 */
  .form-grid{grid-template-columns:1fr;gap:12px}
  input,select,textarea{font-size:16px;padding:10px 12px} /* 16px 防 iOS 缩放 */

  /* 表格横向滚动 */
  #bookList,#memberList,#recordList,#catList{overflow-x:auto;-webkit-overflow-scrolling:touch}
  #bookList table,#memberList table,#recordList table,#catList table{min-width:640px}
  .modal-body table{min-width:560px}

  /* 弹窗全屏 */
  .modal-mask{padding:0;align-items:flex-end}
  .modal{border-radius:16px 16px 0 0;max-width:none;width:100%;max-height:92vh}
  .modal-body{padding:18px}
  .modal-foot{padding:12px 18px;padding-bottom:calc(12px + env(safe-area-inset-bottom))}
  .modal-foot .btn{flex:1;min-height:44px}

  /* 会员徽章 */
  .badge-item{min-width:45%;padding:10px 14px}
  .badge-item .v{font-size:18px}
}