/* =====================================================================
   TFXIOT — Cloud frontend style system
   Strict two-color theme (#222831 + #DFD0B8), day/night toggle.
   Flat / utilitarian. No backdrop-blur, no radial gradients in bg,
   no hover lifts, no soft drop shadows.
   All legacy class names preserved so JS-generated HTML keeps working.
   ===================================================================== */

:root, [data-theme="day"]{
  --bg:  #DFD0B8;
  --ink: #222831;
  --ink-rgb: 34, 40, 49;
}
[data-theme="night"]{
  --bg:  #222831;
  --ink: #DFD0B8;
  --ink-rgb: 223, 208, 184;
}

:root{
  --ink-90: rgba(var(--ink-rgb), 0.90);
  --ink-70: rgba(var(--ink-rgb), 0.70);
  --ink-55: rgba(var(--ink-rgb), 0.55);
  --ink-30: rgba(var(--ink-rgb), 0.30);
  --ink-20: rgba(var(--ink-rgb), 0.20);
  --ink-12: rgba(var(--ink-rgb), 0.12);
  --ink-08: rgba(var(--ink-rgb), 0.08);
  --ink-06: rgba(var(--ink-rgb), 0.06);

  /* backwards-compat aliases for any inline styles in HTML / JS-generated content */
  --txt:        var(--ink);
  --txt-soft:   var(--ink-90);
  --txt-muted:  var(--ink-55);
  --muted:      var(--ink-55);
  --line:       var(--ink-20);
  --line-soft:  var(--ink-12);
  --acc:        var(--ink);
  --card:       transparent;
  --shadow:     none;
  --shadow-sm:  none;
  --shadow-lg:  none;

  --radius:    6px;
  --radius-sm: 4px;
  --radius-xs: 4px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-weight:400;
  color: var(--ink);
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
  background: var(--bg);
}
a{ color: var(--ink); text-decoration: underline }
a:hover{ opacity:.7 }
code, .mono{ font-family: ui-monospace, "JetBrains Mono", monospace; font-size:.92em }

/* =====================================================================
   TOP NAV
   ===================================================================== */
.nav{
  display:flex; align-items:center; gap:12px;
  padding:12px 22px;
  background: var(--bg);
  border-bottom: 1px solid var(--ink-20);
  position:sticky; top:0; z-index:20;
}
.brand{display:flex; align-items:center; gap:14px; font-weight:600; color: var(--ink)}
.brand-wordmark{display:flex; flex-direction:column; line-height:1.2}
.brand-wordmark .product{
  font-weight:600; font-size:18px; color: var(--ink);
}
.brand-wordmark .tag{
  font-weight:500; font-size:11px;
  color: var(--ink-55);
  letter-spacing:.5px;
  text-transform:uppercase;
}
.logo, img.logo, svg.logo{
  height:60px; width:auto;
  color: var(--ink); /* for any SVG fallback that uses currentColor */
  display:block;
}
/* "The Forum" wordmark rendered as a CSS mask filled with the theme's exact ink
   colour — ivory on the dark theme, charcoal on the light theme — from a single
   transparent asset, so it matches the rest of the UI with no invert colour drift. */
.logo-wordmark{
  width:100%;
  max-width:240px;
  aspect-ratio: 657 / 180;
  height:auto;
  display:block;
  margin: 0 auto 18px;
  background-color: var(--ink);
  -webkit-mask: url(/assets/tflogo-wordmark.png) no-repeat center / contain;
          mask: url(/assets/tflogo-wordmark.png) no-repeat center / contain;
}
/* The monogram PNG keeps the simple invert trick (used only as a fallback / favicon). */
[data-theme="day"] .logo,
[data-theme="day"] img.logo{ filter: invert(1); }

/* Full "The Forum" lockup in the dashboard top nav — same mask treatment. */
.nav .brand-logo{
  height:44px; aspect-ratio: 657 / 180; display:block;
  background-color: var(--ink);
  -webkit-mask: url(/assets/tflogo-wordmark.png) no-repeat center / contain;
          mask: url(/assets/tflogo-wordmark.png) no-repeat center / contain;
}
.brand-divider{
  display:inline-block; width:1px; height:32px;
  background: var(--ink-20); flex:0 0 auto;
}
@media (max-width:680px){
  .nav .brand-logo{ height:34px }
  .brand-divider, .nav .brand-wordmark{ display:none }
}
.nav .spacer{flex:1}
.nav-tab{
  color: var(--ink-70);
  font-size:14px;
  padding:6px 12px;
  border-radius: 4px;
  cursor:pointer;
  font-weight:500;
  border: 1px solid transparent;
}
.nav-tab:hover{ color: var(--ink); background: var(--ink-06) }
.nav-tab.active{
  color: var(--ink);
  background: var(--ink-08);
  border-color: var(--ink-20);
}
.nav .user{ font-size:13px; color: var(--ink-55) }
.btn-logout{
  background:transparent;
  border:1px solid var(--ink-20);
  color: var(--ink);
  padding:6px 12px;
  border-radius: 4px;
  cursor:pointer;
  font-size:13px;
  font-family: inherit;
  font-weight:500;
}
.btn-logout:hover{ background: var(--ink-06) }

.theme-toggle{
  display:inline-flex; align-items:center; justify-content:center;
  width:32px; height:32px; border-radius: 4px;
  background:transparent; border:1px solid var(--ink-20);
  color: var(--ink); cursor:pointer; padding:0;
}
.theme-toggle:hover{ background: var(--ink-06) }
.theme-toggle svg{ width:15px; height:15px }
[data-theme="day"]  .theme-toggle .icon-sun  { display:none }
[data-theme="night"] .theme-toggle .icon-moon { display:none }
.theme-toggle.floating{
  position:fixed; top:18px; right:18px; z-index:30;
  background: var(--bg);
}

/* =====================================================================
   LAYOUT
   ===================================================================== */
.wrap{max-width:1180px; margin:24px auto; padding:0 22px}
.section-title{
  font-size:11px;
  color: var(--ink-55);
  letter-spacing:.7px;
  text-transform:uppercase;
  margin:24px 0 10px;
  font-weight:600;
}

/* =====================================================================
   CARDS (plain, just a thin border)
   ===================================================================== */
.card{
  background: transparent;
  border:1px solid var(--ink-20);
  border-radius: 6px;
  padding: 16px 18px;
}
.card h2{
  margin:0 0 10px;
  font-size:15px;
  color: var(--ink);
  font-weight:600;
}
.grid{display:grid; gap:12px}
.cols-2{grid-template-columns:1fr 1fr}
.cols-3{grid-template-columns:repeat(3,1fr)}
.cols-auto{grid-template-columns:repeat(auto-fill, minmax(220px, 1fr))}
@media (max-width:780px){ .cols-2, .cols-3 { grid-template-columns:1fr } }

/* =====================================================================
   FORMS
   ===================================================================== */
label{
  display:block; font-size:11px;
  color: var(--ink-55);
  margin-bottom:4px;
  letter-spacing:.3px;
  font-weight:600;
  text-transform: uppercase;
}
input,select,textarea{
  width:100%; padding:9px 12px;
  border-radius: 4px;
  background: var(--bg);
  border:1px solid var(--ink-20);
  color: var(--ink);
  font-size:14px;
  outline:none;
  font-family: inherit;
  font-weight:500;
}
input:focus, select:focus, textarea:focus{
  border-color: var(--ink-55);
}
input::placeholder{ color: var(--ink-30) }

/* =====================================================================
   BUTTONS
   ===================================================================== */
.btn{
  display:inline-flex; align-items:center; justify-content:center;
  gap:6px;
  padding:9px 14px;
  border-radius: 4px;
  border:1px solid var(--ink);
  background: var(--ink);
  color: var(--bg);
  font-weight:600;
  font-size:13px;
  cursor:pointer;
  font-family: inherit;
}
.btn:hover{ opacity:.85 }
.btn.ghost{
  background:transparent; color: var(--ink);
  border-color: var(--ink-20);
}
.btn.ghost:hover{ background: var(--ink-06); opacity:1 }
.btn.danger{
  background:transparent; color: var(--ink-90);
  border:1px dashed var(--ink-55);
}
.btn.danger:hover{ background: var(--ink-06); opacity:1 }
.btn.good{
  background: var(--ink); color: var(--bg);
}
.btn.small{ padding:5px 10px; font-size:12px }

/* =====================================================================
   PILLS / BADGES
   ===================================================================== */
.pill{
  display:inline-block;
  font-size:11px;
  padding:3px 9px;
  border-radius: 4px;
  background:transparent;
  color: var(--ink-70);
  border:1px solid var(--ink-20);
  font-weight:500;
}
.pill.ok{ background: var(--ink); border-color: var(--ink); color: var(--bg) }
.pill.warn{ border:1px dashed var(--ink-55); color: var(--ink-90) }
.pill.err{ border:1px solid var(--ink-55); color: var(--ink-90); text-decoration: line-through }
@keyframes tfx-pulse{ 0%{opacity:.4} 50%{opacity:1} 100%{opacity:.4} }
.pill.live::before{
  content:""; display:inline-block; width:6px; height:6px; border-radius:50%;
  background: var(--ink); margin-right:6px; vertical-align:middle;
  animation: tfx-pulse 1.5s infinite ease-in-out;
}

/* =====================================================================
   TABLES
   ===================================================================== */
.tbl{ width:100%; border-collapse:collapse; font-size:13.5px }
.tbl th, .tbl td{
  padding:10px 12px;
  border-bottom: 1px solid var(--ink-12);
  text-align:left;
}
.tbl th{
  color: var(--ink-55);
  font-weight:600;
  font-size:11px;
  letter-spacing:.4px;
  text-transform:uppercase;
}
.tbl tr:hover td{ background: var(--ink-06) }
.tbl code{
  font-family: ui-monospace, "JetBrains Mono", monospace;
  font-size:12.5px;
  color: var(--ink);
  background: var(--ink-08);
  padding:1px 5px; border-radius:3px;
}

/* =====================================================================
   STAT TILES (overview KPI cards — plain, no glass)
   ===================================================================== */
.tile{
  background: transparent;
  border:1px solid var(--ink-20);
  border-radius: 6px;
  padding:14px 16px;
}
.tile .l{
  color: var(--ink-55);
  font-size:11px;
  text-transform:uppercase;
  letter-spacing:.5px;
  font-weight:600;
}
.tile .v{
  font-family: ui-monospace, "JetBrains Mono", monospace;
  font-size:28px;
  font-weight:600;
  margin-top:6px;
  color: var(--ink);
  line-height:1.05;
  font-variant-numeric: tabular-nums;
}
.tile .u{ font-size:14px; color: var(--ink-55); margin-left:4px; font-weight:500 }
.tile .n{ font-size:12px; color: var(--ink-90); margin-top:6px }

/* =====================================================================
   MODAL
   ===================================================================== */
.modal-back{
  position:fixed; inset:0;
  background: rgba(var(--ink-rgb), 0.55);
  display:flex; align-items:center; justify-content:center;
  z-index:100; padding:20px;
}
.modal{
  background: var(--bg);
  border:1px solid var(--ink-20);
  border-radius: 6px;
  width:100%; max-width:560px; padding:22px;
  color: var(--ink);
}
.modal h3{
  margin:0 0 14px;
  font-size:16px;
  font-weight:600;
  color: var(--ink);
}
.modal .row{ margin-bottom:10px }
.modal .actions{ display:flex; justify-content:flex-end; gap:8px; margin-top:16px }

/* =====================================================================
   EMPTY STATE / TOAST
   ===================================================================== */
.empty{
  padding:36px; text-align:center;
  color: var(--ink-55); font-size:13px;
}

.toast{
  position:fixed; bottom:20px; left:50%; transform:translateX(-50%);
  background: var(--ink); border:1px solid var(--ink); color: var(--bg);
  padding:9px 16px; border-radius: 4px;
  font-size:13px; opacity:0; transition: opacity .2s;
  z-index:200; pointer-events:none;
  font-weight:500;
}
.toast.show{ opacity:1 }
.toast.err{ border:1px dashed var(--bg) }

/* =====================================================================
   LOGIN / ACTIVATION CARDS (plain, centered)
   ===================================================================== */
.center-screen{
  min-height:100vh;
  display:flex; align-items:center; justify-content:center;
  padding:20px;
  background: var(--bg);
}
.login-card{
  width:100%; max-width:400px;
  background: transparent;
  border:1px solid var(--ink-20);
  padding:24px;
  border-radius: 6px;
}
.login-card h1{
  margin:0 0 4px;
  font-weight:600;
  font-size:20px;
  color: var(--ink);
}
.login-card .sub{
  color: var(--ink-55);
  font-size:13px;
  margin-bottom:18px;
}
.login-card .row{ margin-bottom:12px }
.login-card .btn{ width:100%; padding:11px; font-size:14px }
.login-card .logo-wordmark{
  width:100%;
  max-width:240px;
  height:auto;
  display:block;
  margin: 0 auto 18px;
}

/* =====================================================================
   SHARED SENSOR TILES (air-quality tiers + sparklines)
   Used by the company dashboard and the super-admin company view.
   ===================================================================== */
.tile.tier-good{ --tier:109,143, 74; border-color: rgba(var(--tier),.55); background: rgba(var(--tier),.10) }
.tile.tier-near{ --tier:200,150, 86; border-color: rgba(var(--tier),.60); background: rgba(var(--tier),.13) }
.tile.tier-over{ --tier:178, 80, 80; border-color: rgba(var(--tier),.60); background: rgba(var(--tier),.14) }
.tile .badges{ display:flex; gap:4px; flex-wrap:wrap; margin-left:auto }
.tile .badge{
  display:inline-block; font-size:9px; font-weight:700;
  letter-spacing:.6px; text-transform:uppercase;
  padding:2px 7px; border-radius:3px; color: var(--ink);
  background: rgba(var(--tier, var(--ink-rgb)), .25);
  border:1px solid rgba(var(--tier, var(--ink-rgb)), .45);
}
.tile .badge.stale{ background:transparent; border:1px dashed var(--ink-55); color: var(--ink-90) }
.tile .v .trend{
  font-size: 0.55em; margin-left: 6px;
  color: rgba(var(--tier, var(--ink-rgb)), .9);
  font-family: system-ui, sans-serif;
}
.tile .spark{ display:block; width:100%; height:44px; margin-top:10px; overflow:visible }
.spark path.line{
  fill:none; stroke: rgba(var(--tier, var(--ink-rgb)), .85);
  stroke-width:1.4; stroke-linecap:round; stroke-linejoin:round;
}
.spark path.area{ stroke:none; fill: rgba(var(--tier, var(--ink-rgb)), .18) }
.spark .empty-msg{
  fill: var(--ink-55); font-size:10px;
  font-family: ui-monospace, "JetBrains Mono", monospace;
}