/* 物理实验室管理系统 - 自写精简样式框架（本地资源，禁 CDN） */
:root{
  --primary:#1a4d8f;--primary-2:#2563a8;--success:#1a7f37;--warning:#b45309;
  --danger:#b91c1c;--muted:#6b7280;--bg:#f3f5f8;--card:#fff;--border:#dfe3ea;
  --text:#1f2937;--radius:10px;--shadow:0 1px 3px rgba(16,24,40,.08),0 4px 12px rgba(16,24,40,.06);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:-apple-system,"PingFang SC","Microsoft YaHei","Segoe UI",sans-serif;
  background:var(--bg);color:var(--text);font-size:14px;line-height:1.6}
a{color:var(--primary);text-decoration:none}
a:hover{color:var(--primary-2)}
.container{max-width:1280px;margin:0 auto;padding:0 16px}
.row{display:flex;flex-wrap:wrap;gap:16px}
.col-1{flex:0 0 calc(8.333% - 16px)}.col-2{flex:0 0 calc(16.66% - 16px)}
.col-3{flex:0 0 calc(25% - 16px)}.col-4{flex:0 0 calc(33.33% - 16px)}
.col-6{flex:0 0 calc(50% - 16px)}.col-8{flex:0 0 calc(66.66% - 16px)}.col-12{flex:0 0 100%}
@media(max-width:900px){.col-3,.col-4,.col-6{flex:0 0 100%}}
.mt-1{margin-top:6px}.mt-2{margin-top:12px}.mt-3{margin-top:20px}.mb-2{margin-bottom:12px}
.text-center{text-align:center}.text-right{text-align:right}.small{font-size:12px;color:var(--muted)}
.navbar{background:#0f2c52;color:#fff;padding:10px 0;position:sticky;top:0;z-index:50}
.navbar .container{display:flex;align-items:center;flex-wrap:wrap;gap:8px}
.navbar .brand{font-weight:700;font-size:16px;color:#fff;display:flex;align-items:center;gap:8px}
.navbar .brand img{height:28px;width:28px}
.nav-link{color:#cfe0f5;padding:6px 9px;border-radius:6px;font-size:13px;display:inline-block}
.nav-link:hover{color:#fff;background:rgba(255,255,255,.12)}
.navbar .userbox{margin-left:auto;display:flex;align-items:center;gap:10px;font-size:13px;color:#dfe9f7}
.harea-banner{background:#fff7e6;color:#7a4a00;padding:8px 16px;font-size:13px;border-bottom:1px solid #f0d9a8}
.offline-bar{background:#fde8e8;color:#7f1d1d;padding:6px 16px;font-size:12px}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:16px}
.card-header{padding:14px 18px;border-bottom:1px solid var(--border);font-weight:600;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.card-body{padding:16px 18px}
.stat{padding:14px 16px;display:flex;flex-direction:column;gap:2px}
.stat .v{font-size:26px;font-weight:700}.stat .k{font-size:12px;color:var(--muted)}
.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border-radius:8px;border:1px solid transparent;
  font-size:13px;cursor:pointer;background:#e5e9ef;color:var(--text)}
.btn:hover{filter:brightness(.96)}
.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-2)}
.btn-success{background:var(--success);color:#fff}
.btn-warning{background:#d97706;color:#fff}.btn-danger{background:var(--danger);color:#fff}
.btn-muted{background:#f0f2f5;color:#374151;border-color:var(--border)}
.btn-sm{padding:4px 10px;font-size:12px}.btn-lg{padding:11px 20px;font-size:15px}.btn-block{width:100%;justify-content:center}
a.btn{text-decoration:none}
.badge{display:inline-block;padding:2px 8px;border-radius:999px;font-size:12px;font-weight:500}
.badge-ok{background:#e6f4ea;color:#1a7f37}.badge-warning{background:#fef3c7;color:#b45309}
.badge-danger{background:#fee2e2;color:#b91c1c}.badge-info{background:#e0ecf9;color:#1a4d8f}
.badge-muted{background:#f0f2f5;color:#6b7280}
.table{width:100%;border-collapse:collapse;font-size:13px}
.table th,.table td{padding:9px 12px;border-bottom:1px solid var(--border);text-align:left}
.table th{background:#f8fafc;color:#374151;font-weight:600;white-space:nowrap}
.table tbody tr:hover{background:#f8fafc}
.table .row-danger{background:#fef2f2!important}.table .row-danger:hover{background:#fde8e8!important}
.table-wrap{overflow-x:auto}
.form-group{margin-bottom:14px}
.form-label{display:block;font-size:13px;font-weight:600;margin-bottom:6px}
.form-control{width:100%;padding:8px 12px;border:1px solid var(--border);border-radius:8px;font-size:14px;background:#fff;color:var(--text)}
.form-control:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(26,77,143,.12)}
textarea.form-control{min-height:80px;resize:vertical}
.form-hint{font-size:12px;color:var(--muted);margin-top:4px}
.alert{padding:11px 14px;border-radius:8px;margin-bottom:12px;font-size:13px;border:1px solid}
.alert-success{background:#e6f4ea;border-color:#bfe3cc;color:#14532d}
.alert-danger{background:#fee2e2;border-color:#f5c2c2;color:#7f1d1d}
.alert-warning{background:#fef3c7;border-color:#f3e0a8;color:#78350f}
.alert-info{background:#e0ecf9;border-color:#bcd6f0;color:#1e3a5f}
#toast-wrap{position:fixed;right:16px;top:16px;z-index:300;display:flex;flex-direction:column;gap:8px}
.toast{background:#111827;color:#fff;padding:11px 16px;border-radius:8px;font-size:13px;min-width:220px;
  box-shadow:var(--shadow);opacity:0;transform:translateX(30px);transition:.3s}
.toast.show{opacity:1;transform:none}
.toast.success{background:#166534}.toast.danger{background:#991b1b}.toast.warning{background:#92400e}
.tabs{display:flex;border-bottom:1px solid var(--border);gap:4px;flex-wrap:wrap}
.tab-btn{padding:9px 16px;cursor:pointer;border-bottom:3px solid transparent;font-size:13px;color:var(--muted)}
.tab-btn.active{border-color:var(--primary);color:var(--primary);font-weight:600}
.tab-pane{display:none}.tab-pane.active{display:block;padding-top:14px}
.timeline{position:relative;padding-left:20px}
.timeline::before{content:"";position:absolute;left:5px;top:4px;bottom:4px;width:2px;background:var(--border)}
.tl-item{position:relative;padding:6px 0 14px}
.tl-item::before{content:"";position:absolute;left:-18px;top:10px;width:10px;height:10px;border-radius:50%;background:var(--primary-2)}
.chart-box{width:100%;height:230px;position:relative}
.chart-box canvas{width:100%!important;height:100%!important}
.pagination{display:flex;gap:6px;align-items:center;flex-wrap:wrap}
.pagination a,.pagination span{padding:6px 12px;border:1px solid var(--border);border-radius:6px;font-size:13px;color:var(--primary)}
.pagination .cur{background:var(--primary);color:#fff;border-color:var(--primary)}
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden}
.login-wrap .bg-svg{position:absolute;inset:0;width:100%;height:100%;z-index:0;opacity:.3}
.login-card{position:relative;z-index:1;background:rgba(255,255,255,.96);border-radius:14px;
  box-shadow:0 20px 60px rgba(0,0,0,.2);width:min(400px,92vw);padding:30px}
.login-logo{text-align:center;margin-bottom:18px}
.login-logo img{width:72px;height:72px}
.empty{padding:40px;text-align:center;color:var(--muted)}
.empty .big{font-size:40px;margin-bottom:8px}
.search-bar{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.search-bar input{flex:0 1 220px}
.toolbar{display:flex;gap:8px;align-items:center;justify-content:space-between;flex-wrap:wrap;margin-bottom:12px}
.nowrap{white-space:nowrap}
.footer{text-align:center;color:var(--muted);font-size:12px;padding:20px}