:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#20252c;background:#f5f7f9}
*{box-sizing:border-box}body{margin:0;min-height:100vh;display:flex;background:#f5f7f9}
.sidebar{width:240px;min-height:100vh;background:#171b22;color:#fff;padding:28px 18px;display:flex;flex-direction:column}
.brand{padding:0 10px 28px}.brand-main{font-size:18px;font-weight:800}.brand-sub{margin-top:5px;font-size:13px;color:#a9b0ba}
nav{display:grid;gap:6px}.nav-item{border:0;border-radius:8px;padding:12px 14px;background:transparent;color:#d8dde5;text-align:left;font-size:14px}
.nav-item.active{background:#292f39;color:#fff;font-weight:700}.nav-item.disabled{opacity:.42}.sidebar-footer{margin-top:auto;padding:16px 10px 0;color:#7f8895;font-size:12px}
.main{flex:1;padding:34px 40px 50px;overflow-x:auto}.topbar{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:26px}
h1{margin:0;font-size:28px}.topbar p{margin:7px 0 0;color:#747d88;font-size:14px}
.primary,.secondary{border-radius:8px;padding:11px 17px;font-weight:700}.primary{border:0;background:#262d36;color:#fff}.secondary{border:1px solid #dce1e6;background:#fff;color:#343b44}
.summary{display:grid;grid-template-columns:repeat(3,minmax(150px,220px));gap:14px;margin-bottom:22px}.summary-card,.panel{background:#fff;border:1px solid #e7eaee;border-radius:12px}
.summary-card{padding:18px 20px}.summary-card span{color:#767f89;font-size:13px}.summary-card strong{display:block;margin-top:9px;font-size:27px}
.panel{overflow:hidden}.toolbar{display:flex;padding:16px;border-bottom:1px solid #eceff2}.toolbar input{margin-left:auto;width:260px;min-height:38px;border:1px solid #dfe3e8;border-radius:8px;padding:9px 12px}
.table-wrap{overflow-x:auto}table{width:100%;border-collapse:collapse;min-width:980px}th,td{padding:15px 18px;border-bottom:1px solid #eef0f3;text-align:left}th{font-size:12px;color:#727b85;background:#fafbfc}td{font-size:14px}
.device-link{border:0;background:transparent;padding:0;text-align:left;cursor:pointer}.device-name{display:block;font-weight:700;color:#20252c}.device-code{display:block;margin-top:3px;color:#9299a2;font-size:11px}
.status{display:inline-flex;align-items:center;gap:7px;font-weight:700;font-size:13px}.status-dot{width:8px;height:8px;border-radius:50%;background:currentColor}.status.online{color:#287a4f}.status.offline{color:#818995}
.small-action{border:1px solid #d7dce2;background:#fff;border-radius:7px;padding:8px 11px;font-weight:700;cursor:pointer}.small-action:hover{background:#f5f7f9}
.modal-backdrop{position:fixed;inset:0;background:rgba(17,22,29,.46);display:grid;place-items:center;padding:20px;z-index:20}.modal-backdrop.hidden{display:none}
.modal{width:min(560px,100%);background:#fff;border-radius:14px;padding:24px;box-shadow:0 24px 70px rgba(15,23,42,.18)}
.modal-header{display:flex;justify-content:space-between;gap:18px;margin-bottom:20px}.modal-header h2{margin:0}.modal-header p{margin:6px 0 0;color:#7a838e}.icon-button{border:0;background:transparent;font-size:28px;color:#707985;cursor:pointer}
#registerForm{display:grid;gap:15px}#registerForm label{display:grid;gap:7px;font-size:13px;font-weight:700;color:#505965}
#registerForm input,#registerForm select{min-height:42px;border:1px solid #dce1e6;border-radius:8px;padding:10px 12px;font:inherit;background:#fff}
.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:18px}.form-message{min-height:18px;font-size:13px}
.status-grid{display:grid;grid-template-columns:160px 1fr;gap:12px 18px;margin:0}.status-grid dt{color:#77808b}.status-grid dd{margin:0;font-weight:700}