:root{
  --bg:#f4f6f9; --panel:#fff; --line:#e3e8ef; --text:#1f2733; --muted:#7a869a;
  --primary:#ff7a18; --primary-d:#e86600; --ok:#28a745; --warn:#f0ad4e; --danger:#dc3545;
  --sidebar:#1f2733; --sidebar2:#27313f;
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,"Segoe UI",Roboto,"Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text)}
.hidden{display:none!important}
button{cursor:pointer;font-family:inherit}
input,select,textarea{font-family:inherit;font-size:14px;padding:9px 11px;border:1px solid var(--line);border-radius:6px;outline:none;width:100%}
input:focus,select:focus,textarea:focus{border-color:var(--primary)}
button.primary{background:var(--primary);color:#fff;border:none;padding:10px 18px;border-radius:6px;font-weight:600}
button.primary:hover{background:var(--primary-d)}
button.ghost{background:#fff;border:1px solid var(--line);padding:7px 13px;border-radius:6px;color:var(--text)}
button.ghost:hover{border-color:var(--primary);color:var(--primary)}
button.danger{background:var(--danger);color:#fff;border:none;padding:7px 13px;border-radius:6px}
button:disabled{opacity:.5;cursor:not-allowed}

/* 登录 */
.login-view{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#1f2733,#2c3a4d)}
.login-card{background:#fff;padding:38px 34px;border-radius:14px;width:340px;box-shadow:0 18px 50px rgba(0,0,0,.25);text-align:center}
.login-card h1{margin:0 0 4px;font-size:21px;color:var(--sidebar)}
.login-card .sub{margin:0 0 22px;color:var(--muted);font-size:13px;letter-spacing:1px}
.login-card input{margin-bottom:12px}
.login-card button{width:100%;margin-top:6px}
.msg{margin-top:12px;font-size:13px;min-height:18px;color:var(--danger)}

/* 主框架 */
.main-view{display:flex;height:100vh}
.sidebar{width:210px;background:var(--sidebar);color:#fff;display:flex;flex-direction:column}
.brand{padding:20px 18px;font-size:17px;font-weight:700;line-height:1.3;border-bottom:1px solid var(--sidebar2)}
.brand span{font-size:12px;color:var(--primary);font-weight:400;letter-spacing:2px}
.sidebar nav{padding:10px 0;flex:1;overflow:auto}
.nav-item{padding:12px 20px;cursor:pointer;font-size:14px;color:#c4ccd8;border-left:3px solid transparent}
.nav-item:hover{background:var(--sidebar2);color:#fff}
.nav-item.active{background:var(--sidebar2);color:#fff;border-left-color:var(--primary)}
.content{flex:1;display:flex;flex-direction:column;overflow:hidden}
.topbar{height:56px;background:var(--panel);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 22px}
#page-title{font-size:16px;font-weight:600}
.user-box{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--muted)}
.role-badge{background:var(--primary);color:#fff;padding:2px 9px;border-radius:10px;font-size:12px}
#logout-btn{background:none;border:1px solid var(--line);padding:5px 12px;border-radius:6px;color:var(--text)}
#page{padding:22px;overflow:auto;flex:1}

/* 卡片/统计 */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:14px;margin-bottom:22px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:16px}
.card .n{font-size:26px;font-weight:700}
.card .l{color:var(--muted);font-size:13px;margin-top:4px}

/* 表格 */
.panel{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:16px;margin-bottom:18px}
.panel h3{margin:0 0 14px;font-size:15px}
.toolbar{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:14px;align-items:flex-end}
.toolbar .f{flex:1;min-width:140px}
.toolbar label{display:block;font-size:12px;color:var(--muted);margin-bottom:4px}
table{width:100%;border-collapse:collapse;font-size:13px}
th,td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--line);vertical-align:middle}
th{color:var(--muted);font-weight:600;background:#fafbfc}
tr:hover td{background:#fafbfc}
.tag{display:inline-block;padding:2px 8px;border-radius:9px;font-size:12px;background:#eef1f5;color:var(--muted)}
.tag.on{background:#e6f7ec;color:var(--ok)}
.tag.off{background:#fdeaea;color:var(--danger)}
.row-actions{display:flex;gap:6px;flex-wrap:wrap}
.muted{color:var(--muted)}
.empty{padding:30px;text-align:center;color:var(--muted)}

/* 视频墙 */
.wall{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:14px}
.wall-item{background:#000;border-radius:10px;overflow:hidden;position:relative}
.wall-item video{width:100%;height:240px;background:#000;object-fit:contain;display:block}
.wall-item .bar{position:absolute;top:0;left:0;right:0;background:rgba(0,0,0,.55);color:#fff;font-size:12px;padding:6px 10px;display:flex;justify-content:space-between}
.wall-item .stop{background:var(--danger);color:#fff;border:none;padding:3px 9px;border-radius:5px;font-size:12px}

/* 弹窗 */
.modal{position:fixed;inset:0;background:rgba(0,0,0,.45);display:flex;align-items:center;justify-content:center;z-index:50}
.modal-box{background:#fff;border-radius:12px;width:480px;max-width:92vw;max-height:88vh;overflow:auto;box-shadow:0 20px 60px rgba(0,0,0,.3)}
.modal-head{display:flex;justify-content:space-between;align-items:center;padding:14px 18px;border-bottom:1px solid var(--line);font-weight:600}
.modal-head button{background:none;border:none;font-size:18px;color:var(--muted)}
.modal-body{padding:18px}
.form-row{margin-bottom:13px}
.form-row label{display:block;font-size:12px;color:var(--muted);margin-bottom:4px}
.modal .actions{display:flex;justify-content:flex-end;gap:10px;margin-top:10px}

/* toast */
.toast{position:fixed;bottom:26px;left:50%;transform:translateX(-50%);background:#1f2733;color:#fff;padding:11px 20px;border-radius:8px;font-size:14px;z-index:60;box-shadow:0 8px 24px rgba(0,0,0,.3)}

/* 单位树 */
.tree,.tree ul{list-style:none;margin:0;padding-left:18px}
.tree>ul{padding-left:0}
.tree li{margin:2px 0}
.tree-row{display:flex;align-items:center;gap:10px;padding:7px 10px;background:var(--panel);border:1px solid var(--line);border-radius:8px}
.tree-name{font-weight:600}

/* 级联下拉 */
.cascade{display:flex;flex-wrap:wrap;gap:8px}
.cascade select{min-width:150px}