/* =========================================================
   DROWSY-GUARD IOT — shared design system
   ========================================================= */

   @import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&family=IBM+Plex+Sans:wght@400;500;600&family=IBM+Plex+Mono:wght@500;600&display=swap');

   :root{
     --bg:#12161d;
     --bg-alt:#0d1015;
     --panel:#1a2029;
     --panel-2:#212934;
     --border:#2b3441;
     --text:#e8ecf1;
     --text-dim:#8b96a6;
     --text-faint:#5c6675;
   
     --amber:#e8a33d;
     --amber-dim:#4a3a20;
     --teal:#45b8a4;
     --teal-dim:#1c3833;
     --red:#e2554a;
     --red-dim:#3d2222;
     --blue:#5a8fd6;
     --blue-dim:#1e2c3f;
   
     --radius-s:6px;
     --radius-m:10px;
     --radius-l:16px;
   
     --sidebar-w:224px;
   }
   
   *{box-sizing:border-box;}
   html,body{margin:0;padding:0;}
   body{
     background:var(--bg);
     color:var(--text);
     font-family:'IBM Plex Sans',system-ui,sans-serif;
     font-size:15px;
     line-height:1.5;
     min-height:100vh;
   }
   h1,h2,h3,h4{
     font-family:'Space Grotesk',sans-serif;
     font-weight:600;
     margin:0;
     letter-spacing:-0.01em;
   }
   p{margin:0;}
   a{color:inherit;text-decoration:none;}
   button{font-family:inherit;}
   ::selection{background:var(--amber-dim);color:var(--amber);}
   
   .mono{font-family:'IBM Plex Mono',monospace;font-variant-numeric:tabular-nums;}
   
   .app-shell{
     display:grid;
     grid-template-columns:var(--sidebar-w) 1fr;
     min-height:100vh;
   }
   
   .sidebar{
     background:var(--bg-alt);
     border-right:1px solid var(--border);
     padding:24px 16px;
     display:flex;
     flex-direction:column;
     gap:28px;
     position:sticky;
     top:0;
     height:100vh;
   }
   .brand{
     display:flex;
     align-items:center;
     gap:10px;
     padding:0 8px;
   }
   .brand-mark{
     width:34px;height:34px;
     border-radius:9px;
     background:linear-gradient(160deg,var(--amber),#b97324);
     display:flex;align-items:center;justify-content:center;
     flex-shrink:0;
   }
   .brand-mark svg{width:18px;height:18px;}
   .brand-text h1{font-size:15px;color:var(--text);line-height:1.15;}
   .brand-text span{font-size:11px;color:var(--text-faint);letter-spacing:.03em;}
   
   .nav{display:flex;flex-direction:column;gap:2px;}
   .nav a{
     display:flex;align-items:center;gap:11px;
     padding:10px 12px;
     border-radius:var(--radius-s);
     color:var(--text-dim);
     font-size:13.5px;
     font-weight:500;
     transition:background .15s ease, color .15s ease;
   }
   .nav a svg{width:17px;height:17px;flex-shrink:0;opacity:.85;}
   .nav a:hover{background:var(--panel);color:var(--text);}
   .nav a.active{
     background:var(--panel-2);
     color:var(--amber);
     box-shadow:inset 2px 0 0 var(--amber);
   }
   
   .sidebar-foot{
     margin-top:auto;
     padding:12px;
     border-top:1px solid var(--border);
     display:flex;
     align-items:center;
     gap:9px;
   }
   .dot{width:8px;height:8px;border-radius:50%;background:var(--text-faint);flex-shrink:0;}
   .dot.live{background:var(--teal);box-shadow:0 0 0 3px var(--teal-dim);animation:blink 1.4s infinite;}
   .dot.alert{background:var(--red);box-shadow:0 0 0 3px var(--red-dim);}
   @keyframes blink{0%,100%{opacity:1;}50%{opacity:.35;}}
   .sidebar-foot .label{font-size:11.5px;color:var(--text-faint);}
   .sidebar-foot .label b{color:var(--text-dim);font-weight:500;display:block;font-size:12.5px;}
   
   .main{padding:26px 34px 60px;max-width:1280px;}
   .topbar{
     display:flex;justify-content:space-between;align-items:flex-start;
     margin-bottom:26px;flex-wrap:wrap;gap:14px;
   }
   .topbar h2{font-size:22px;color:var(--text);}
   .topbar .sub{font-size:13.5px;color:var(--text-dim);margin-top:4px;}
   .status-pill{
     display:flex;align-items:center;gap:8px;
     background:var(--panel);border:1px solid var(--border);
     padding:8px 14px;border-radius:999px;
     font-size:12.5px;color:var(--text-dim);
   }
   
   .btn{
     padding:10px 18px;border-radius:var(--radius-s);border:1px solid transparent;
     font-size:13.5px;font-weight:600;cursor:pointer;
     display:inline-flex;align-items:center;gap:8px;
     transition:transform .12s ease, filter .12s ease, opacity .12s ease;
   }
   .btn:active{transform:translateY(1px);}
   .btn:disabled{opacity:.4;cursor:not-allowed;}
   .btn svg{width:15px;height:15px;}
   .btn-amber{background:var(--amber);color:#1b1305;}
   .btn-amber:hover:not(:disabled){filter:brightness(1.08);}
   .btn-outline{background:transparent;border-color:var(--border);color:var(--text);}
   .btn-outline:hover:not(:disabled){border-color:var(--text-dim);}
   .btn-red{background:var(--red-dim);color:var(--red);border-color:#5c2c28;}
   .btn-red:hover:not(:disabled){filter:brightness(1.15);}
   .btn-ghost{background:var(--panel);color:var(--text-dim);border-color:var(--border);}
   .btn-ghost:hover:not(:disabled){color:var(--text);}
   
   .panel{
     background:var(--panel);
     border:1px solid var(--border);
     border-radius:var(--radius-l);
     padding:22px;
   }
   .panel h3{font-size:13px;color:var(--text-dim);text-transform:uppercase;letter-spacing:.06em;font-weight:600;margin-bottom:16px;}
   
   .metric-grid{
     display:grid;
     grid-template-columns:repeat(auto-fit,minmax(190px,1fr));
     gap:14px;
   }
   .metric-card{
     background:var(--panel);
     border:1px solid var(--border);
     border-radius:var(--radius-m);
     padding:18px 20px;
     cursor:pointer;
     transition:border-color .15s ease, transform .12s ease;
     position:relative;
     overflow:hidden;
   }
   .metric-card:hover{border-color:var(--text-faint);transform:translateY(-1px);}
   .metric-card:focus-visible{outline:2px solid var(--amber);outline-offset:2px;}
   .metric-card .m-label{font-size:12px;color:var(--text-dim);display:flex;align-items:center;gap:7px;}
   .metric-card .m-label svg{width:14px;height:14px;}
   .metric-card .m-value{font-family:'IBM Plex Mono',monospace;font-size:34px;font-weight:600;margin-top:10px;line-height:1;}
   .metric-card .m-unit{font-size:13px;color:var(--text-faint);margin-left:4px;font-weight:500;}
   .metric-card .m-hint{font-size:11px;color:var(--text-faint);margin-top:10px;}
   
   .c-hr{color:#ef6a6a;}
   .c-rr{color:var(--blue);}
   .c-sdnn{color:var(--teal);}
   .c-rmssd{color:var(--amber);}
   .c-drowsy.normal{color:var(--teal);}
   .c-drowsy.light{color:var(--amber);}
   .c-drowsy.drowsy{color:var(--red);}
   
   .drowsy-banner{
     display:flex;justify-content:space-between;align-items:center;
     background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-l);
     padding:20px 26px;margin-bottom:20px;flex-wrap:wrap;gap:16px;
   }
   .drowsy-banner .state{font-family:'Space Grotesk',sans-serif;font-size:21px;font-weight:600;}
   .drowsy-banner .state.normal{color:var(--teal);}
   .drowsy-banner .state.light{color:var(--amber);}
   .drowsy-banner .state.drowsy{color:var(--red);}
   .drowsy-banner .state-label{font-size:11.5px;color:var(--text-dim);text-transform:uppercase;letter-spacing:.06em;margin-bottom:5px;}
   .gauge-track{width:220px;height:9px;background:var(--panel-2);border-radius:999px;overflow:hidden;}
   .gauge-fill{height:100%;border-radius:999px;transition:width .4s ease, background .3s ease;}
   .gauge-fill.normal{background:var(--teal);}
   .gauge-fill.light{background:var(--amber);}
   .gauge-fill.drowsy{background:var(--red);}
   
   .modal-backdrop{
     position:fixed;inset:0;background:rgba(8,10,14,.72);
     display:none;align-items:center;justify-content:center;z-index:50;padding:20px;
   }
   .modal-backdrop.open{display:flex;}
   .modal{
     background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-l);
     width:100%;max-width:640px;padding:22px 24px 26px;
   }
   .modal-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px;}
   .modal-head h3{font-size:15px;color:var(--text);text-transform:none;letter-spacing:0;}
   .modal-close{background:none;border:none;color:var(--text-dim);cursor:pointer;font-size:18px;line-height:1;padding:4px;}
   .modal-close:hover{color:var(--text);}
   .modal canvas{width:100%!important;height:220px!important;}
   
   .chart-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;}
   .chart-box{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-l);padding:18px 20px;}
   .chart-box h4{font-size:12.5px;color:var(--text-dim);text-transform:uppercase;letter-spacing:.05em;margin-bottom:12px;font-weight:600;}
   .chart-box canvas{width:100%!important;height:210px!important;}
   .chart-box-wide{grid-column:1 / -1;}
   .chart-box .note{font-size:10.5px;color:var(--text-faint);margin-top:8px;}
   
   .field{margin-bottom:16px;}
   .field label{display:block;font-size:12.5px;color:var(--text-dim);margin-bottom:7px;font-weight:500;}
   .field input, .field select{
     width:100%;background:var(--bg-alt);border:1px solid var(--border);
     color:var(--text);padding:11px 13px;border-radius:var(--radius-s);font-size:14px;
     font-family:inherit;
   }
   .field input:focus, .field select:focus{outline:none;border-color:var(--amber);}
   
   .wifi-list{display:flex;flex-direction:column;gap:2px;}
   .wifi-item{
     display:flex;align-items:center;justify-content:space-between;
     padding:13px 14px;border-radius:var(--radius-s);cursor:pointer;
     border:1px solid transparent;
   }
   .wifi-item:hover{background:var(--panel-2);}
   .wifi-item.selected{border-color:var(--amber);background:var(--panel-2);}
   .wifi-item .left{display:flex;align-items:center;gap:11px;}
   .wifi-item .ssid{font-size:14px;color:var(--text);}
   .wifi-item .meta{font-size:11.5px;color:var(--text-faint);margin-top:2px;}
   .signal-bars{display:flex;align-items:flex-end;gap:2px;height:14px;}
   .signal-bars i{width:3px;background:var(--text-faint);border-radius:1px;display:block;}
   .signal-bars.strong i{background:var(--teal);}
   
   .hero{
     display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center;
     padding:8px 0 44px;border-bottom:1px solid var(--border);margin-bottom:44px;
   }
   .hero-eyebrow{font-size:12.5px;color:var(--amber);font-weight:600;margin-bottom:14px;}
   .hero h1{font-size:40px;line-height:1.12;color:var(--text);margin-bottom:16px;}
   .hero p.lead{font-size:15.5px;color:var(--text-dim);max-width:52ch;margin-bottom:26px;}
   .hero-actions{display:flex;gap:12px;}
   .hero-visual{
     background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-l);
     padding:26px;position:relative;
   }
   .pipeline{display:flex;flex-direction:column;gap:0;}
   .pipeline-step{display:flex;gap:14px;padding:14px 0;}
   .pipeline-step:not(:last-child){border-bottom:1px dashed var(--border);}
   .pipeline-num{
     font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--amber);
     width:26px;height:26px;border:1px solid var(--amber-dim);border-radius:50%;
     display:flex;align-items:center;justify-content:center;flex-shrink:0;
   }
   .pipeline-step .t-title{font-size:14px;color:var(--text);font-weight:600;margin-bottom:3px;}
   .pipeline-step .t-desc{font-size:12.5px;color:var(--text-dim);line-height:1.5;}
   
   .section-title{font-size:12.5px;color:var(--text-dim);text-transform:uppercase;letter-spacing:.06em;font-weight:600;margin-bottom:18px;}
   .spec-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:14px;margin-bottom:44px;}
   .spec-card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-m);padding:20px;}
   .spec-card .s-icon{width:32px;height:32px;border-radius:8px;background:var(--panel-2);display:flex;align-items:center;justify-content:center;margin-bottom:14px;}
   .spec-card .s-icon svg{width:17px;height:17px;color:var(--amber);}
   .spec-card h4{font-size:14.5px;color:var(--text);margin-bottom:6px;}
   .spec-card p{font-size:12.5px;color:var(--text-dim);line-height:1.55;}
   
   .menu-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;}
   .menu-card{
     background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-l);
     padding:22px;display:flex;flex-direction:column;gap:12px;transition:border-color .15s ease;
   }
   .menu-card:hover{border-color:var(--amber-dim);}
   .menu-card .m-icon{width:38px;height:38px;border-radius:10px;background:var(--panel-2);display:flex;align-items:center;justify-content:center;}
   .menu-card .m-icon svg{width:19px;height:19px;color:var(--amber);}
   .menu-card h4{font-size:15px;color:var(--text);}
   .menu-card p{font-size:12.5px;color:var(--text-dim);line-height:1.55;}
   .menu-card .go{font-size:12.5px;color:var(--amber);font-weight:600;margin-top:auto;display:flex;align-items:center;gap:5px;}
   
   .led-panel{display:flex;gap:22px;align-items:flex-start;justify-content:center;padding:6px 0 4px;}
   .led-item{display:flex;flex-direction:column;align-items:center;gap:8px;}
   .led{
     width:18px;height:18px;border-radius:50%;
     background:var(--panel-2);border:1px solid var(--border);
     transition:background .25s ease, box-shadow .25s ease;
   }
   .led.on.normal{background:var(--teal);box-shadow:0 0 14px 4px var(--teal-dim), 0 0 6px 1px var(--teal);}
   .led.on.light{background:var(--amber);box-shadow:0 0 14px 4px var(--amber-dim), 0 0 6px 1px var(--amber);}
   .led.on.drowsy{background:var(--red);box-shadow:0 0 16px 5px var(--red-dim), 0 0 8px 2px var(--red);animation:blink .7s infinite;}
   .led-item .led-label{font-size:11px;color:var(--text-dim);text-transform:uppercase;letter-spacing:.04em;}
   
   .cam-wrap{background:#000;border-radius:var(--radius-m);overflow:hidden;border:1px solid var(--border);position:relative;aspect-ratio:16/9;display:flex;align-items:center;justify-content:center;}
   .cam-wrap img{width:100%;height:100%;object-fit:cover;display:block;}
   .cam-placeholder{color:var(--text-faint);font-size:12.5px;text-align:center;padding:20px;}
   .rec-dot{position:absolute;top:12px;left:12px;display:none;align-items:center;gap:7px;background:rgba(8,10,14,.7);padding:6px 11px;border-radius:999px;font-size:11.5px;color:#fff;}
   .rec-dot.on{display:flex;}
   .rec-dot i{width:8px;height:8px;border-radius:50%;background:var(--red);animation:blink 1s infinite;}
   
   .table-wrap{overflow-x:auto;}
   table{width:100%;border-collapse:collapse;font-size:13px;}
   th{text-align:left;color:var(--text-dim);font-weight:500;padding:9px 12px;border-bottom:1px solid var(--border);font-size:11.5px;text-transform:uppercase;letter-spacing:.04em;}
   td{padding:9px 12px;border-bottom:1px solid var(--border);font-family:'IBM Plex Mono',monospace;color:var(--text-dim);}
   tr:last-child td{border-bottom:none;}
   
   .toast{
     position:fixed;bottom:24px;right:24px;background:var(--panel-2);border:1px solid var(--border);
     padding:13px 18px;border-radius:var(--radius-s);font-size:13px;color:var(--text);
     box-shadow:0 8px 24px rgba(0,0,0,.35);display:flex;align-items:center;gap:10px;
     transform:translateY(12px);opacity:0;pointer-events:none;transition:all .25s ease;z-index:80;
   }
   .toast.show{transform:translateY(0);opacity:1;}
   .toast.ok{border-color:#2d4a3f;}
   .toast.err{border-color:#4a2d2d;}
   
   @media (max-width:920px){
     .app-shell{grid-template-columns:1fr;}
     .sidebar{position:relative;height:auto;flex-direction:row;align-items:center;padding:14px 16px;overflow-x:auto;}
     .brand-text span{display:none;}
     .nav{flex-direction:row;}
     .sidebar-foot{display:none;}
     .main{padding:20px;}
     .hero{grid-template-columns:1fr;}
     .chart-grid{grid-template-columns:1fr;}
   }
   @media (prefers-reduced-motion:reduce){
     *{animation-duration:.001ms!important;transition-duration:.001ms!important;}
   }