:root {
  --bg:#0a1628; --bg2:#0f1f3d; --bg3:#162847;
  --accent:#00d4aa; --accent2:#0099ff;
  --warn:#ffb300; --danger:#ff4444;
  --text:#e8f4f8; --text2:#8ab0c8;
  --border:rgba(0,212,170,0.15); --card:rgba(15,31,61,0.9);
}
*{margin:0;padding:0;box-sizing:border-box;}
body{font-family:'Exo 2',sans-serif;background:var(--bg);color:var(--text);min-height:100vh;}
body::before{content:'';position:fixed;inset:0;z-index:-1;
  background:radial-gradient(ellipse at 20% 20%,rgba(0,212,170,0.08) 0%,transparent 50%),
             radial-gradient(ellipse at 80% 80%,rgba(0,153,255,0.06) 0%,transparent 50%);}

#login-screen{position:fixed;inset:0;z-index:100;display:flex;align-items:center;justify-content:center;
  background:rgba(10,22,40,0.97);backdrop-filter:blur(10px);}
.login-box{background:var(--bg2);border:1px solid var(--border);border-radius:20px;padding:40px;width:320px;
  box-shadow:0 20px 60px rgba(0,0,0,0.5);}
.login-box h2{color:var(--accent);font-size:22px;margin-bottom:8px;text-align:center;}
.login-box p{color:var(--text2);font-size:13px;text-align:center;margin-bottom:28px;}
.login-box input{width:100%;padding:12px 16px;border-radius:10px;border:1px solid var(--border);
  background:var(--bg3);color:var(--text);font-family:'Exo 2',sans-serif;font-size:15px;
  margin-bottom:12px;outline:none;transition:border 0.2s;}
.login-box input:focus{border-color:var(--accent);}
.login-box button{width:100%;padding:13px;border-radius:10px;border:none;
  background:linear-gradient(135deg,var(--accent),var(--accent2));
  color:#000;font-family:'Exo 2',sans-serif;font-size:15px;font-weight:700;cursor:pointer;}
.login-error{color:var(--danger);font-size:13px;text-align:center;margin-top:10px;display:none;}

header{background:rgba(10,22,40,0.95);border-bottom:1px solid var(--border);
  padding:12px 20px;display:flex;align-items:center;justify-content:space-between;
  position:sticky;top:0;z-index:50;backdrop-filter:blur(10px);}
.logo{display:flex;align-items:center;gap:10px;}
.logo-icon{width:32px;height:32px;background:linear-gradient(135deg,var(--accent),var(--accent2));
  border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:18px;}
.logo h1{font-size:18px;font-weight:700;}
.logo span{font-size:11px;color:var(--text2);}
#last-update{font-family:'JetBrains Mono',monospace;font-size:11px;color:var(--text2);}
.logout-btn{background:none;border:1px solid var(--border);color:var(--text2);
  padding:6px 12px;border-radius:8px;cursor:pointer;font-size:12px;}

main{padding:16px;max-width:1200px;margin:0 auto;}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(290px,1fr));gap:16px;}
.card{background:var(--card);border:1px solid var(--border);border-radius:16px;
  padding:20px;backdrop-filter:blur(10px);transition:transform 0.2s;}
.card:hover{transform:translateY(-2px);}
.card-title{display:flex;align-items:center;gap:8px;font-size:13px;font-weight:600;
  color:var(--accent);text-transform:uppercase;letter-spacing:1px;
  margin-bottom:16px;padding-bottom:10px;border-bottom:1px solid var(--border);}
.row{display:flex;justify-content:space-between;align-items:center;
  padding:7px 0;border-bottom:1px solid rgba(255,255,255,0.04);}
.row:last-child{border-bottom:none;}
.row-label{color:var(--text2);font-size:13px;}
.row-value{font-family:'JetBrains Mono',monospace;font-size:13px;font-weight:600;}
.green{color:var(--accent);} .blue{color:var(--accent2);}
.yellow{color:var(--warn);} .red{color:var(--danger);} .gray{color:var(--text2);}

.status-bar{display:flex;gap:8px;margin-bottom:16px;flex-wrap:wrap;}
.status-chip{padding:4px 10px;border-radius:20px;font-size:11px;font-weight:600;border:1px solid;}
.status-chip.ok{border-color:var(--accent);color:var(--accent);background:rgba(0,212,170,0.1);}
.status-chip.warn{border-color:var(--warn);color:var(--warn);background:rgba(255,179,0,0.1);}
.status-chip.bad{border-color:var(--danger);color:var(--danger);background:rgba(255,68,68,0.1);}
.status-chip.off{border-color:var(--text2);color:var(--text2);background:rgba(138,176,200,0.05);}

.tank-wrap{margin:10px 0;}
.tank-label{display:flex;justify-content:space-between;margin-bottom:6px;font-size:13px;}
.tank-bar{height:14px;background:var(--bg3);border-radius:7px;overflow:hidden;}
.tank-fill{height:100%;border-radius:7px;transition:width 1s ease, background 1s ease;}
.tank-fill.full{background:linear-gradient(90deg,var(--accent),#00ff88);}
.tank-fill.ok{background:linear-gradient(90deg,var(--accent),var(--accent2));}
.tank-fill.low{background:linear-gradient(90deg,var(--warn),#ff8800);}
.tank-fill.empty{background:linear-gradient(90deg,var(--danger),#ff8800);}
.tank-status{font-size:11px;margin-top:4px;color:var(--text2);}

.node-row{display:flex;align-items:center;gap:10px;padding:10px 0;
  border-bottom:1px solid rgba(255,255,255,0.04);}
.node-row:last-child{border-bottom:none;}
.node-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0;}
.node-dot.online{background:var(--accent);box-shadow:0 0 6px var(--accent);}
.node-dot.offline{background:var(--text2);}
.node-name{flex:1;font-size:13px;}
.node-vac{font-family:'JetBrains Mono',monospace;font-size:13px;font-weight:600;}

.valves-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-bottom:12px;}
.valve-btn{padding:10px 6px;border-radius:10px;border:1px solid var(--border);
  background:var(--bg3);color:var(--text2);font-family:'Exo 2',sans-serif;
  font-size:11px;font-weight:600;text-align:center;line-height:1.4;
  cursor:pointer;transition:all 0.2s;user-select:none;}
.valve-btn:active{opacity:0.7;}
.valve-btn.active{background:rgba(0,212,170,0.2);border-color:var(--accent);color:var(--accent);}
.valve-btn.filling{background:rgba(0,153,255,0.15);border-color:var(--accent2);color:var(--accent2);}

.pump-row{display:flex;align-items:center;justify-content:space-between;
  padding:12px 0;border-top:1px solid var(--border);margin-top:8px;}
.pump-status{font-size:14px;font-weight:600;}
.pump-btn{padding:8px 20px;border-radius:10px;border:none;cursor:pointer;
  font-family:'Exo 2',sans-serif;font-size:13px;font-weight:700;transition:opacity 0.2s;}
.pump-btn.on{background:linear-gradient(135deg,var(--accent),var(--accent2));color:#000;}
.pump-btn.off{background:rgba(255,68,68,0.2);border:1px solid var(--danger);color:var(--danger);}
.pump-btn:active{opacity:0.7;}

.confirm-overlay{position:fixed;inset:0;z-index:200;display:none;
  align-items:center;justify-content:center;background:rgba(0,0,0,0.7);}
.confirm-box{background:var(--bg2);border:1px solid var(--border);border-radius:16px;
  padding:28px;width:300px;text-align:center;}
.confirm-box h3{margin-bottom:12px;color:var(--text);}
.confirm-box p{color:var(--text2);font-size:13px;margin-bottom:20px;}
.confirm-btns{display:flex;gap:10px;}
.confirm-btns button{flex:1;padding:10px;border-radius:10px;border:none;
  font-family:'Exo 2',sans-serif;font-size:14px;font-weight:600;cursor:pointer;}
.btn-yes{background:linear-gradient(135deg,var(--accent),var(--accent2));color:#000;}
.btn-no{background:var(--bg3);color:var(--text2);border:1px solid var(--border)!important;}