:root {
  --bg: #0a0a13;
  --bg-elev: rgba(255, 255, 255, 0.04);
  --bg-elev-2: rgba(255, 255, 255, 0.06);
  --card: rgba(22, 22, 38, 0.6);
  --card-border: rgba(255, 255, 255, 0.08);
  --text: #e9eaf3;
  --text-dim: #9aa0b4;
  --text-faint: #6a6f86;
  --accent: #8b5cf6;
  --accent-2: #22d3ee;
  --accent-3: #f472b6;
  --accent-warm: #fbbf24;
  --good: #00e676;
  --ok: #ffeb3b;
  --usg: #ff9800;
  --bad: #f44336;
  --worse: #9c27b0;
  --hazard: #7e0023;
  --ring: rgba(139, 92, 246, 0.55);
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35), 0 1px 0 rgba(255, 255, 255, 0.04) inset;
  --radius: 18px;
  --radius-sm: 10px;
  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f5ff;
    --bg-elev: rgba(0, 0, 0, 0.03);
    --bg-elev-2: rgba(0, 0, 0, 0.05);
    --card: rgba(255, 255, 255, 0.85);
    --card-border: rgba(10, 10, 30, 0.08);
    --text: #12132a;
    --text-dim: #4c5170;
    --text-faint: #7f849e;
    --shadow: 0 10px 30px rgba(30, 20, 80, 0.08), 0 1px 0 rgba(255, 255, 255, 0.6) inset;
    color-scheme: light;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", ui-sans-serif, system-ui, -apple-system, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "cv11", "ss01", "tnum";
}

body {
  overflow-x: hidden;
  padding-bottom: 48px;
}

/* Animated background */
.bg-grid {
  position: fixed; inset: 0; z-index: -2;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: radial-gradient(ellipse at top, rgba(0, 0, 0, 0.9), transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at top, rgba(0, 0, 0, 0.9), transparent 75%);
  pointer-events: none;
}

.bg-glow {
  position: fixed; inset: -10% -20% auto -20%; height: 70vh; z-index: -1;
  background:
    radial-gradient(40% 60% at 20% 30%, rgba(139, 92, 246, 0.35), transparent 60%),
    radial-gradient(45% 55% at 80% 20%, rgba(34, 211, 238, 0.28), transparent 60%),
    radial-gradient(35% 45% at 55% 75%, rgba(244, 114, 182, 0.22), transparent 60%);
  filter: blur(30px);
  pointer-events: none;
  animation: drift 26s ease-in-out infinite alternate;
}
@keyframes drift {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  100% { transform: translate3d(-2%, 2%, 0) scale(1.05); }
}

/* Top bar */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 24px; gap: 12px;
  position: sticky; top: 0; z-index: 5;
  backdrop-filter: blur(10px);
  background: linear-gradient(to bottom, rgba(10, 10, 19, 0.75), rgba(10, 10, 19, 0.2));
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 600; letter-spacing: 0.02em;
}
.brand .dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #fff, var(--accent) 60%);
  box-shadow: 0 0 14px var(--ring);
}
.brand-name { color: var(--text); }
.brand-sep { color: var(--text-faint); }
.brand-sensor { color: var(--text-dim); font-variant-numeric: tabular-nums; }

.topbar-actions { display: flex; align-items: center; gap: 10px; }
.icon-btn {
  width: 38px; height: 38px; border-radius: 12px;
  background: var(--bg-elev); color: var(--text);
  border: 1px solid var(--card-border);
  display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer; transition: transform 120ms ease, background 120ms ease;
}
.icon-btn:hover { background: var(--bg-elev-2); transform: translateY(-1px); }
.icon-btn svg { width: 18px; height: 18px; }

.refresh-ring {
  position: relative; width: 38px; height: 38px;
  display: inline-flex; align-items: center; justify-content: center;
}
.refresh-ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.refresh-ring .ring-bg { fill: none; stroke: var(--card-border); stroke-width: 2; }
.refresh-ring .ring-fg {
  fill: none; stroke: url(#rg); stroke: var(--accent-2);
  stroke-width: 2; stroke-linecap: round;
  stroke-dasharray: 97.39; stroke-dashoffset: 0;
  transition: stroke-dashoffset 1s linear;
}
.refresh-ring .ring-label {
  position: absolute; font-size: 10px; color: var(--text-dim); font-variant-numeric: tabular-nums;
}

/* Main layout */
#app {
  max-width: 1400px;
  margin: 0 auto; padding: 8px 20px 24px;
}

/* Hero */
.hero {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 18px;
  padding: 20px;
  border-radius: var(--radius);
  background: linear-gradient(145deg, rgba(139, 92, 246, 0.18), rgba(34, 211, 238, 0.1) 60%, rgba(255, 255, 255, 0.02));
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow);
  margin-bottom: 18px;
  overflow: hidden;
  position: relative;
}
.hero::after {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(80% 60% at 100% 0%, rgba(255, 255, 255, 0.08), transparent 60%);
  pointer-events: none;
}
.sensor-name {
  margin: 0 0 10px;
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  font-weight: 700;
}
.hero-chips {
  display: flex; flex-wrap: wrap; gap: 8px;
}
.chip {
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--bg-elev);
  border: 1px solid var(--card-border);
  color: var(--text-dim);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  display: inline-flex; align-items: center; gap: 6px;
}
.chip strong { color: var(--text); font-weight: 600; }
.chip.live { background: rgba(0, 230, 118, 0.1); color: #7af3b4; border-color: rgba(0, 230, 118, 0.25); }
.chip.stale { background: rgba(255, 152, 0, 0.1); color: #ffc875; border-color: rgba(255, 152, 0, 0.25); }
.chip.dead { background: rgba(244, 67, 54, 0.1); color: #ff8d83; border-color: rgba(244, 67, 54, 0.25); }

/* AQI tile */
.hero-aqi {
  border-radius: calc(var(--radius) - 4px);
  padding: 18px;
  background: linear-gradient(160deg, var(--aqi-color, var(--accent)), transparent 80%), rgba(0, 0, 0, 0.25);
  border: 1px solid var(--card-border);
  position: relative; overflow: hidden;
  display: flex; flex-direction: column; justify-content: center;
  min-height: 220px;
  transition: background 600ms ease;
}
.aqi-label { font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; color: rgba(255,255,255,0.75); }
.aqi-number {
  font-size: clamp(64px, 9vw, 104px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  margin-top: 6px;
  text-shadow: 0 2px 24px rgba(0, 0, 0, 0.35);
}
.aqi-category {
  font-size: 18px; font-weight: 600; margin-top: 4px;
  color: rgba(255, 255, 255, 0.92);
}
.aqi-subline {
  margin-top: 6px; font-size: 13px; color: rgba(255, 255, 255, 0.72);
}
.aqi-scale {
  margin-top: 16px; height: 8px; border-radius: 999px; position: relative;
  background: linear-gradient(to right,
    var(--good) 0%, var(--good) 8.3%,
    var(--ok) 8.3%, var(--ok) 20%,
    var(--usg) 20%, var(--usg) 33%,
    var(--bad) 33%, var(--bad) 50%,
    var(--worse) 50%, var(--worse) 66.6%,
    var(--hazard) 66.6%, var(--hazard) 100%);
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.25);
}
.aqi-scale::after {
  content: ""; position: absolute; top: -4px; width: 3px; height: 16px; border-radius: 2px;
  background: #fff; box-shadow: 0 0 8px rgba(0,0,0,0.5);
  left: var(--aqi-pct, 0%);
  transform: translateX(-50%);
  transition: left 600ms ease;
}

/* Panels */
.panels {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}
.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 16px 18px 18px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
  position: relative;
  overflow: hidden;
  min-height: 120px;
}
.card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 2px;
  background: linear-gradient(to right, transparent, var(--accent-2), var(--accent), transparent);
  opacity: 0.45;
}
.card.span-2 { grid-column: span 2; }
.card.span-full { grid-column: 1 / -1; }
.card-h {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 10px; margin-bottom: 10px;
}
.card h2 { margin: 0; font-size: 14px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-dim); font-weight: 600; }
.card .card-sub { font-size: 11px; color: var(--text-faint); letter-spacing: 0.08em; text-transform: uppercase; }

.footnote { margin: 10px 0 0; font-size: 11px; color: var(--text-faint); }
.chart-wrap { position: relative; width: 100%; height: 280px; }

/* Mass rows */
.mass-rows { display: flex; flex-direction: column; gap: 10px; margin-top: 4px; }
.mass-row { display: grid; grid-template-columns: 68px 1fr 72px; gap: 10px; align-items: center; }
.mass-row .m-label { font-size: 13px; color: var(--text-dim); }
.mass-row .m-bar { height: 10px; background: var(--bg-elev); border-radius: 999px; overflow: hidden; position: relative; }
.mass-row .m-fill { height: 100%; border-radius: inherit; transition: width 500ms ease; }
.mass-row .m-val { text-align: right; font-variant-numeric: tabular-nums; font-size: 14px; font-weight: 600; }

/* Env grid */
.env-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.env-tile {
  background: var(--bg-elev);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  padding: 12px;
  display: flex; flex-direction: column; gap: 4px;
  position: relative;
  overflow: hidden;
}
.env-tile .t-label { font-size: 11px; text-transform: uppercase; letter-spacing: 0.12em; color: var(--text-faint); }
.env-tile .t-value { font-size: 24px; font-weight: 700; letter-spacing: -0.01em; font-variant-numeric: tabular-nums; }
.env-tile .t-sub { font-size: 11px; color: var(--text-dim); }

/* KV grid */
.kv-grid {
  display: grid; grid-template-columns: 1fr; gap: 6px;
  font-size: 13px;
}
.kv-row {
  display: flex; justify-content: space-between; gap: 12px;
  padding: 6px 0;
  border-bottom: 1px dashed var(--card-border);
}
.kv-row:last-child { border-bottom: none; }
.kv-row .k { color: var(--text-dim); }
.kv-row .v { color: var(--text); font-variant-numeric: tabular-nums; font-weight: 500; text-align: right; }
.kv-row .v.muted { color: var(--text-faint); }

/* Diagnostics */
.diag-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 10px; }
.diag-tile {
  background: var(--bg-elev);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  padding: 12px;
}
.diag-tile .d-label { font-size: 11px; text-transform: uppercase; letter-spacing: 0.12em; color: var(--text-faint); margin-bottom: 6px; }
.diag-tile .d-row { display: flex; justify-content: space-between; font-size: 14px; font-variant-numeric: tabular-nums; }
.diag-tile .d-row + .d-row { margin-top: 4px; }
.diag-tile .d-delta { font-size: 11px; color: var(--text-dim); margin-top: 6px; }
.diag-tile .d-delta strong { color: var(--text); }
.diag-tile.ok { border-color: rgba(0, 230, 118, 0.3); }
.diag-tile.warn { border-color: rgba(255, 152, 0, 0.3); }
.diag-tile.err { border-color: rgba(244, 67, 54, 0.35); }

/* Wi-Fi bars */
.wifi { display: inline-flex; align-items: end; gap: 2px; height: 12px; }
.wifi span { width: 3px; background: var(--text-faint); border-radius: 1px; }
.wifi span:nth-child(1) { height: 25%; }
.wifi span:nth-child(2) { height: 50%; }
.wifi span:nth-child(3) { height: 75%; }
.wifi span:nth-child(4) { height: 100%; }
.wifi span.on { background: var(--accent-2); }

/* Raw */
details summary {
  cursor: pointer; color: var(--text-dim); font-size: 12px;
  padding: 6px 0;
}
.raw-json {
  margin: 8px 0 0;
  padding: 12px;
  background: var(--bg-elev);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  font-family: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, monospace;
  font-size: 12px;
  color: var(--text);
  overflow: auto;
  max-height: 520px;
  white-space: pre;
}

/* Map */
.map-wrap { margin-top: 10px; border-radius: var(--radius-sm); overflow: hidden; border: 1px solid var(--card-border); aspect-ratio: 16/9; background: #111; }
.map-wrap img { width: 100%; height: 100%; object-fit: cover; display: block; }

/* Footer */
.footer {
  max-width: 1400px; margin: 18px auto 0; padding: 0 24px;
  display: flex; justify-content: space-between; color: var(--text-faint); font-size: 12px;
}
.footer a { color: var(--text-dim); text-decoration: none; border-bottom: 1px dashed var(--text-faint); }
.footer a:hover { color: var(--text); }

/* Toast */
.toast {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%) translateY(20px);
  padding: 10px 14px; background: rgba(244, 67, 54, 0.92); color: white;
  border-radius: 10px; box-shadow: var(--shadow); font-size: 13px; max-width: 90vw;
  opacity: 0; transition: transform 200ms ease, opacity 200ms ease;
  z-index: 20;
}
.toast.visible { opacity: 1; transform: translateX(-50%) translateY(0); }

/* Dialog */
dialog.settings {
  padding: 0; border: none; background: transparent;
  max-width: min(92vw, 440px); width: 100%;
  margin: auto;
}
dialog.settings::backdrop { background: rgba(5, 5, 15, 0.6); backdrop-filter: blur(4px); }
dialog.settings form {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 22px;
  display: flex; flex-direction: column; gap: 14px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
  color: var(--text);
}
dialog.settings h2 { margin: 0; font-size: 18px; }
dialog.settings .settings-intro { margin: 0; font-size: 12px; color: var(--text-dim); }
dialog.settings label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--text-dim); }
dialog.settings label span { color: var(--text); font-weight: 500; }
dialog.settings label em { font-style: normal; color: var(--text-faint); font-weight: 400; }
dialog.settings input, dialog.settings select {
  width: 100%; padding: 10px 12px;
  border-radius: 10px;
  background: var(--bg-elev);
  border: 1px solid var(--card-border);
  color: var(--text);
  font: inherit;
}
dialog.settings small { color: var(--text-faint); font-size: 11px; }
dialog.settings small a { color: var(--text-dim); }
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 4px; }
.btn {
  padding: 10px 14px; border-radius: 10px; border: 1px solid var(--card-border);
  background: var(--bg-elev); color: var(--text); font: inherit; cursor: pointer;
  transition: transform 120ms ease, background 120ms ease;
}
.btn:hover { background: var(--bg-elev-2); transform: translateY(-1px); }
.btn.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-color: transparent; color: #fff; font-weight: 600;
}

/* Skeleton */
.skeleton {
  background: linear-gradient(90deg, var(--bg-elev), var(--bg-elev-2), var(--bg-elev));
  background-size: 200% 100%;
  animation: shimmer 1.4s linear infinite;
  color: transparent !important;
  border-radius: 6px;
}
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Responsive */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; }
  .card.span-2 { grid-column: 1 / -1; }
  #app { padding: 8px 14px 24px; }
  .topbar { padding: 14px 16px; }
}

@media (max-width: 520px) {
  .brand-sep, .brand-sensor { display: none; }
  .chart-wrap { height: 240px; }
  .env-grid { grid-template-columns: 1fr 1fr; }
  .mass-row { grid-template-columns: 56px 1fr 64px; }
}