:root{
  --bg:#0b1020; --bg-soft:#11182e; --panel:#fff; --panel-2:#f6f8fc;
  --ink:#0e1726; --muted:#67708a; --line:#e6eaf2;
  --brand:#ff8a00; --brand-2:#ffb347; --accent:#2f6bff; --green:#19b86b; --red:#e8453c; --amber:#f5a524;
  --radius:16px; --shadow:0 10px 30px rgba(16,24,48,.08);
  --sidebar:#0e1430;
}
body[data-theme="dark"]{
  --bg-soft:#070b16; --bg:#04070f;
  --panel:#161f38; --panel-2:#1d2742; --ink:#eaf0ff; --muted:#9aa4c4; --line:#2b3756;
  --shadow:0 10px 30px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
html,body{margin:0}
body{font-family:system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;color:var(--ink);background:var(--bg-soft)}

/* ---------- Landing / auth ---------- */
.landing{min-height:100vh;display:grid;grid-template-columns:1.1fr .9fr;background:
  radial-gradient(1200px 600px at 80% -10%, rgba(255,138,0,.25), transparent 60%),
  radial-gradient(900px 500px at 10% 110%, rgba(47,107,255,.25), transparent 60%), var(--bg)}
.landing-hero{padding:64px 56px;color:#fff;display:flex;flex-direction:column;justify-content:center;gap:18px}
.landing-hero .logo{display:flex;align-items:center;gap:12px;font-weight:800;font-size:22px}
.logo-mark{width:42px;height:42px;border-radius:12px;display:grid;place-items:center;font-weight:900;color:#1a1205;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));box-shadow:0 8px 20px rgba(255,138,0,.45)}
.landing-hero h1{font-size:40px;line-height:1.1;margin:8px 0}
.landing-hero p{color:#b9c2e0;max-width:520px;font-size:16px}
.hero-stats{display:flex;gap:26px;margin-top:18px}
.hero-stats div{display:flex;flex-direction:column}
.hero-stats b{font-size:26px;color:var(--brand-2)}
.hero-stats span{color:#9aa4c4;font-size:13px}
.auth-wrap{display:grid;place-items:center;padding:32px}
.auth-card{width:min(420px,92vw);background:var(--panel);border-radius:var(--radius);box-shadow:var(--shadow);padding:28px;border:1px solid var(--line)}
.auth-card h2{margin:0 0 4px}
.auth-card .sub{color:var(--muted);margin-bottom:18px;font-size:14px}
.tabs{display:flex;gap:6px;background:var(--panel-2);padding:5px;border-radius:12px;margin-bottom:18px}
.tabs button{flex:1;border:0;background:transparent;padding:9px;border-radius:9px;font-weight:600;color:var(--muted);cursor:pointer}
.tabs button.active{background:var(--panel);color:var(--ink);box-shadow:var(--shadow)}
.field{margin-bottom:14px}
.field label{display:block;font-size:13px;color:var(--muted);margin-bottom:6px}
.field input,.field select{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:10px;background:var(--panel-2);color:var(--ink);font-size:15px}
.btn{border:0;border-radius:10px;padding:12px 16px;font-weight:700;cursor:pointer;font-size:15px}
.btn.primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#1a1205;width:100%}
.btn.ghost{background:var(--panel-2);color:var(--ink);border:1px solid var(--line)}
.btn.block{width:100%}
.muted-link{background:none;border:0;color:var(--accent);cursor:pointer;font-size:13px}
.auth-foot{display:flex;justify-content:space-between;margin-top:12px}
.msg{font-size:13px;padding:10px 12px;border-radius:10px;margin-top:10px;display:none}
.msg.show{display:block}
.msg.err{background:rgba(232,69,60,.12);color:var(--red)}
.msg.ok{background:rgba(25,184,107,.12);color:var(--green)}

/* ---------- App shell ---------- */
.app{display:grid;grid-template-columns:248px 1fr;min-height:100vh}
.sidebar{background:var(--sidebar);color:#cfd6ee;padding:20px 16px;display:flex;flex-direction:column;gap:6px;position:sticky;top:0;height:100vh}
.brand{display:flex;align-items:center;gap:10px;padding:6px 8px 16px;color:#fff;font-weight:800}
.brand small{display:block;font-weight:500;color:#8b95bb;font-size:11px}
.side-nav{display:flex;flex-direction:column;gap:2px;overflow:auto}
.side-nav button{display:flex;align-items:center;gap:10px;text-align:left;border:0;background:transparent;color:#aeb6d6;padding:11px 12px;border-radius:10px;cursor:pointer;font-size:14px;font-weight:600}
.side-nav button:hover{background:rgba(255,255,255,.06);color:#fff}
.side-nav button.active{background:linear-gradient(135deg,rgba(255,138,0,.22),rgba(47,107,255,.18));color:#fff}
.side-nav .ico{width:18px;text-align:center}
.side-foot{margin-top:auto;font-size:12px;color:#7e88ad;padding:10px 8px}
.main{padding:22px 26px;max-width:1280px}
.topbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}
.topbar h1{margin:0;font-size:22px;color:#eef2ff}
.top-actions{display:flex;gap:10px;align-items:center}
.pill{display:inline-flex;align-items:center;gap:7px;padding:6px 12px;border-radius:999px;font-size:12px;font-weight:700}
.pill.on{background:rgba(25,184,107,.14);color:var(--green)}
.pill.off{background:rgba(232,69,60,.14);color:var(--red)}

.view{display:none}
.view.active{display:block;animation:fade .25s ease}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

.kpi-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:18px}
.kpi{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow)}
.kpi span{color:var(--muted);font-size:13px}
.kpi strong{display:block;font-size:26px;margin-top:6px}
.kpi small{color:var(--green);font-weight:600}

.grid{display:grid;gap:14px}
.cols-2{grid-template-columns:1.4fr .9fr}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);margin-bottom:14px}
.panel-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}
.panel-head h3{margin:0;font-size:16px}
.eyebrow{color:var(--brand);font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase}
.segmented{display:inline-flex;background:var(--panel-2);border-radius:10px;padding:4px;gap:3px}
.segmented button{border:0;background:transparent;padding:7px 14px;border-radius:8px;font-weight:600;color:var(--muted);cursor:pointer;font-size:13px}
.segmented button.active{background:var(--panel);color:var(--ink);box-shadow:var(--shadow)}
.chart{width:100%;height:300px}
#gen-chart{height:600px}
.chart-sm{height:220px}
.day-nav{display:flex;align-items:center;justify-content:center;gap:14px;margin:-4px 0 12px;font-size:13px;font-weight:700;color:var(--muted)}
.day-nav button{border:1px solid var(--line);background:var(--panel-2);color:var(--ink);width:30px;height:30px;border-radius:8px;cursor:pointer;font-size:18px;line-height:1;display:inline-flex;align-items:center;justify-content:center}
.day-nav button:disabled{cursor:default;opacity:.35}
.day-nav #day-label{min-width:96px;text-align:center}
.ef-node-hit{cursor:pointer}
.ef-tip{position:fixed;z-index:80;pointer-events:none;display:none;white-space:pre-line;
  background:var(--panel);color:var(--ink);border:1px solid var(--line);border-radius:10px;
  box-shadow:var(--shadow);padding:8px 12px;font-size:12px;line-height:1.55;max-width:240px;font-weight:600}
.mod-grid{display:grid;grid-template-columns:190px 1fr;gap:16px;margin-top:14px}
.mod-metrics{display:flex;flex-direction:column;gap:8px}
.mod-metrics button{text-align:left;border:1px solid var(--line);background:var(--panel-2);color:var(--muted);padding:9px 12px;border-radius:10px;font-weight:700;cursor:pointer;font-size:13px}
.mod-metrics button.active{background:var(--panel);color:var(--ink);border-color:var(--brand)}
.mod-chart-wrap{min-width:0}
#mod-chart{height:340px}
@media(max-width:760px){.mod-grid{grid-template-columns:1fr}}
.series-toggle{display:flex;gap:8px;justify-content:flex-end;margin-top:12px;flex-wrap:wrap}
.series-toggle button{display:inline-flex;align-items:center;gap:7px;border:1px solid var(--line);background:var(--panel-2);color:var(--muted);padding:6px 13px;border-radius:999px;font-size:13px;font-weight:700;cursor:pointer}
.series-toggle button i{width:10px;height:10px;border-radius:50%;display:inline-block;opacity:.3}
.series-toggle button.active{color:var(--ink);background:var(--panel);border-color:var(--brand)}
.series-toggle button.active i{opacity:1}
.series-toggle button:not(.active){text-decoration:line-through;opacity:.65}

/* animated energy flow diagram */
#flow-diagram{width:100%;display:flex;justify-content:center}
#flow-diagram svg{width:100%;max-width:900px;height:auto;display:block}
.ef-wire{fill:none;stroke:var(--line);stroke-width:7;stroke-linecap:round}
.ef-flow{fill:none;stroke-width:7;stroke-linecap:round;stroke-dasharray:2 16}
.ef-flow.idle{display:none}
.ef-flow.to{animation:ef-to .8s linear infinite}
.ef-flow.from{animation:ef-from .8s linear infinite}
@keyframes ef-to{to{stroke-dashoffset:-18}}
@keyframes ef-from{to{stroke-dashoffset:18}}
.ef-name{font:700 18px system-ui,sans-serif;fill:var(--muted)}
.ef-val{font:800 24px system-ui,sans-serif}
.ef-sub{font:600 15px system-ui,sans-serif;fill:var(--muted)}
.ef-val.pv{fill:#ff8a00}.ef-val.grid{fill:#2f6bff}.ef-val.batt{fill:#19b86b}.ef-val.load{fill:var(--ink)}

table.tbl{width:100%;border-collapse:collapse}
.tbl th,.tbl td{text-align:left;padding:11px 10px;border-bottom:1px solid var(--line);font-size:14px}
.tbl th{color:var(--muted);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.04em}
.tbl tr:hover td{background:var(--panel-2)}
.badge{padding:3px 9px;border-radius:999px;font-size:11px;font-weight:700}
.badge.online{background:rgba(25,184,107,.14);color:var(--green)}
.badge.offline{background:rgba(103,112,138,.18);color:var(--muted)}
.badge.alarm,.badge.critical{background:rgba(232,69,60,.14);color:var(--red)}
.badge.warning{background:rgba(245,165,36,.16);color:var(--amber)}
.badge.resolved{background:rgba(47,107,255,.14);color:var(--accent)}
.mini{border:1px solid var(--line);background:var(--panel-2);border-radius:8px;padding:6px 10px;font-size:12px;cursor:pointer;color:var(--ink);font-weight:600}
.mini:hover{border-color:var(--brand)}

.fields-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:10px}
.fcard{background:var(--panel-2);border:1px solid var(--line);border-radius:12px;padding:12px}
.fcard .t{color:var(--muted);font-size:12px}
.fcard .val{font-size:18px;font-weight:800;margin-top:4px}
.fcard .u{color:var(--muted);font-size:12px;font-weight:600}

.toolbar{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}
.row-actions{display:flex;gap:6px}
.empty{color:var(--muted);text-align:center;padding:30px}

/* modal */
.modal{position:fixed;inset:0;background:rgba(8,12,24,.55);display:none;place-items:center;z-index:50}
.modal.show{display:grid}
.modal-card{background:var(--panel);border-radius:var(--radius);width:min(460px,92vw);padding:22px;box-shadow:var(--shadow)}
.modal-card-lg{width:min(940px,95vw);max-height:90vh;overflow:auto}
.seg-radio{display:flex;gap:20px;flex-wrap:wrap;padding:4px 0}
.seg-radio label{display:flex;align-items:center;gap:7px;cursor:pointer;font-weight:600;font-size:14px}
.seg-radio input{width:auto}
.pill.warn{background:rgba(245,165,36,.16);color:var(--amber)}
.modal-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}
.toast{position:fixed;bottom:22px;left:50%;transform:translateX(-50%);background:#0e1430;color:#fff;padding:11px 18px;border-radius:10px;z-index:60;box-shadow:var(--shadow)}
.diag-step{display:flex;justify-content:space-between;padding:10px 12px;border:1px solid var(--line);border-radius:10px;margin-bottom:8px;background:var(--panel-2)}

/* ================================================================
   RESPONSIVE — mobile navigation + layout
   ================================================================ */

/* Hamburger button — hidden on desktop */
.hamburger{display:none;align-items:center;justify-content:center;background:transparent;border:none;color:#eef2ff;cursor:pointer;padding:7px;border-radius:8px;flex-shrink:0;line-height:0}
.hamburger:hover,.hamburger:focus-visible{background:rgba(255,255,255,.10);outline:none}
.hamburger svg{display:block}

/* Sidebar close button — hidden on desktop */
.nav-close{display:none;margin-left:auto;background:transparent;border:none;color:#8b95bb;font-size:20px;cursor:pointer;padding:2px 6px;border-radius:6px;line-height:1}
.nav-close:hover{color:#fff}

/* Nav backdrop overlay */
.nav-overlay{display:none;position:fixed;inset:0;background:rgba(4,7,15,.62);z-index:95;touch-action:none}
body.nav-open .nav-overlay{display:block}

/* ── Tablet ≤ 980px ─────────────────────────────────── */
@media(max-width:980px){
  .app{grid-template-columns:1fr}
  .hamburger{display:inline-flex}
  .nav-close{display:block}

  /* Slide-in drawer */
  .sidebar{position:fixed!important;top:0;left:-270px;bottom:0;width:260px;height:100%!important;
    flex-direction:column!important;flex-wrap:nowrap!important;z-index:100;
    transition:left .26s cubic-bezier(.4,0,.2,1);overflow-y:auto;
    box-shadow:4px 0 32px rgba(0,0,0,.4)}
  body.nav-open .sidebar{left:0!important}

  .main{padding:16px;max-width:100%}
  .topbar{gap:10px}
  .topbar h1{font-size:18px;flex:1}
  .kpi-grid{grid-template-columns:repeat(2,1fr)}
  .cols-2{grid-template-columns:1fr}
  .landing{grid-template-columns:1fr}
  .landing-hero{display:none}
}

/* ── Phone ≤ 640px ──────────────────────────────────── */
@media(max-width:640px){
  .main{padding:12px}

  /* Topbar */
  .topbar{flex-wrap:nowrap;margin-bottom:12px;gap:8px}
  .topbar h1{font-size:16px;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .top-actions{gap:6px;flex-shrink:0}
  #conn-pill{display:none}
  #plant-select{max-width:120px;font-size:12px}

  /* KPI */
  .kpi-grid{gap:10px;margin-bottom:12px}
  .kpi{padding:12px 10px}
  .kpi span{font-size:11px}
  .kpi strong{font-size:20px;margin-top:4px}
  .kpi small{font-size:11px}

  /* Panels */
  .panel{padding:14px 12px;margin-bottom:12px;border-radius:14px}
  .panel-head{flex-wrap:wrap;gap:8px;margin-bottom:10px}
  .panel-head h3{font-size:15px}
  .eyebrow{font-size:10px}

  /* Segmented controls */
  .segmented{flex-wrap:wrap;gap:2px}
  .segmented button{padding:6px 10px;font-size:12px}

  /* Charts */
  .chart{height:220px}
  #gen-chart{height:440px}
  #mod-chart{height:230px}

  /* Energy flow — horizontal scroll so labels stay readable */
  #flow-diagram{overflow-x:auto;-webkit-overflow-scrolling:touch}
  #flow-diagram svg{min-width:520px}

  /* Series toggle */
  .series-toggle{gap:5px;margin-top:8px}
  .series-toggle button{padding:5px 9px;font-size:12px;gap:5px}
  .series-toggle button i{width:8px;height:8px}

  /* Table scroll wrapper */
  .tbl-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:0 -12px;padding:0 12px}

  /* Hide less-important columns per section */
  /* Devices: hide Type(2), SN(3), Logger(4), Firmware(5) */
  #view-devices .tbl th:nth-child(2),#view-devices .tbl td:nth-child(2),
  #view-devices .tbl th:nth-child(3),#view-devices .tbl td:nth-child(3),
  #view-devices .tbl th:nth-child(4),#view-devices .tbl td:nth-child(4),
  #view-devices .tbl th:nth-child(5),#view-devices .tbl td:nth-child(5){display:none}
  /* Alarms: hide Source(3) */
  #view-alarms .tbl th:nth-child(3),#view-alarms .tbl td:nth-child(3){display:none}
  /* Accounts: hide Email(2) */
  #view-account .tbl th:nth-child(2),#view-account .tbl td:nth-child(2){display:none}

  /* Row action buttons — smaller & wrap */
  .row-actions{flex-wrap:wrap;gap:4px}
  .mini{padding:8px 10px;font-size:12px}

  /* Fields grid */
  .fields-grid{grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:8px}
  .fcard{padding:10px}
  .fcard .val{font-size:15px}

  /* Modals — bottom sheet style */
  .modal{align-items:flex-end;padding:0}
  .modal-card{width:100%;max-height:90vh;border-radius:22px 22px 0 0;overflow-y:auto;
    position:relative;margin:0}
  .modal-card-lg{width:100%;max-height:90vh;border-radius:22px 22px 0 0;overflow-y:auto}
  .mod-grid{grid-template-columns:1fr}
  .mod-metrics{flex-direction:row;flex-wrap:wrap;gap:6px}
  .mod-metrics button{flex:1;min-width:80px;padding:7px 8px;font-size:12px}
  #intg-cloud .grid.cols-2,#add-local-form .grid.cols-2{grid-template-columns:1fr}
  .grid.cols-2{grid-template-columns:1fr}

  /* Toolbar / misc */
  .toolbar{flex-wrap:wrap}
  .toast{bottom:72px}
  .diag-step{flex-wrap:wrap;gap:6px}
  .diag-step .row-actions{width:100%;justify-content:flex-end}

  /* Landing / auth */
  .auth-wrap{padding:20px 16px}
  .auth-card{width:100%}
}

/* ── Very small ≤ 380px ─────────────────────────────── */
@media(max-width:380px){
  .kpi-grid{gap:8px}
  .kpi strong{font-size:17px}
  .topbar h1{font-size:14px}
  #plant-select{max-width:90px}
  .segmented button{padding:5px 8px;font-size:11px}
  .series-toggle button{font-size:11px;padding:4px 7px}
}

/* ── Safe area (iPhone home bar) ────────────────────── */
@supports(padding-bottom:env(safe-area-inset-bottom)){
  @media(max-width:640px){
    .main{padding-bottom:calc(12px + env(safe-area-inset-bottom))}
    .toast{bottom:calc(72px + env(safe-area-inset-bottom))}
  }
}