:root {
  --bg: #0b1020;
  --bg2: #0e1428;
  --card: #151c33;
  --card-brd: #223052;
  --text: #e7ecf5;
  --muted: #93a0bd;
  --muted2: #6f7ea0;
  --accent: #4aa8ff;
  --gust: #ffb443;
  --ok: #37d67a;
  --bad: #ff5c6c;
  --shadow: 0 6px 20px rgba(0, 0, 0, .35);
  --track: rgba(147, 160, 189, .22);   /* faint backdrop for the status ring */
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #eef2f7;
    --bg2: #e6ecf5;
    --card: #ffffff;
    --card-brd: #dbe3ef;
    --text: #121826;
    --muted: #566079;
    --muted2: #8791a6;
    --accent: #1f6fe0;
    --gust: #d9820a;
    --ok: #16a34a;
    --bad: #dc2626;
    --shadow: 0 6px 18px rgba(20, 40, 80, .10);
    --track: rgba(86, 96, 121, .20);
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: radial-gradient(1200px 600px at 50% -10%, var(--bg2), var(--bg)) fixed;
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  line-height: 1.35;
}
.wrap {
  max-width: 560px;
  margin: 0 auto;
  padding: calc(env(safe-area-inset-top) + 14px) 14px calc(env(safe-area-inset-bottom) + 28px);
}

/* Header */
.head { display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; margin-bottom: 12px; }
.head h1 { font-size: 1.45rem; margin: 0; letter-spacing: .2px; }
.sub { margin: 2px 0 0; color: var(--muted); font-size: .82rem; }
.status { display: flex; align-items: center; gap: 6px; font-size: .78rem; color: var(--muted); white-space: nowrap; padding-top: 4px; }
.dot { width: 9px; height: 9px; border-radius: 50%; background: var(--muted2); box-shadow: 0 0 0 3px rgba(127, 127, 127, .12); }
.dot.on { background: var(--ok); box-shadow: 0 0 0 3px rgba(55, 214, 122, .18); }
.dot.off { background: var(--bad); box-shadow: 0 0 0 3px rgba(255, 92, 108, .18); }

/* Progress ring around the status dot — fills toward the next expected reading
   (~1 min cadence) so a visitor sees when the next update is due, not just how
   old the current one is. Amber pulse (.awaiting) once the estimate is overshot;
   grey when offline; a brief pop (.flash) when a fresh reading lands. The ring
   is a masked conic-gradient annulus so the page's gradient background shows
   through its centre — the dot is a sibling, not a masked child. */
.status .ring {
  --p: 0; position: relative; width: 22px; height: 22px; flex: none;
  display: grid; place-items: center; border-radius: 50%;
  transition: transform .18s ease;
}
.status .ring::before {
  content: ""; position: absolute; inset: 0; border-radius: 50%;
  background: conic-gradient(var(--sig, var(--accent)) calc(var(--p) * 1turn), var(--track) 0);
  -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 3px), #000 calc(100% - 3px));
          mask: radial-gradient(farthest-side, transparent calc(100% - 3px), #000 calc(100% - 3px));
}
.status .ring .dot { position: relative; z-index: 1; width: 8px; height: 8px; box-shadow: none; }
.status .ring.awaiting { --sig: var(--gust); animation: ring-pulse 1.1s ease-in-out infinite; }
.status .ring.off { --p: 0; }
.status .ring.flash { animation: ring-flash .5s ease-out; }
@keyframes ring-pulse {
  0%, 100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--gust) 40%, transparent); }
  50% { box-shadow: 0 0 0 5px transparent; }
}
@keyframes ring-flash { 0% { transform: scale(1.22); } 100% { transform: scale(1); } }
@media (prefers-reduced-motion: reduce) {
  .status .ring, .status .ring.awaiting, .status .ring.flash { animation: none !important; transition: none !important; }
}

/* Offline banner */
.banner {
  background: color-mix(in srgb, var(--bad) 16%, var(--card));
  border: 1px solid color-mix(in srgb, var(--bad) 45%, var(--card-brd));
  color: var(--text);
  border-radius: 12px; padding: 10px 12px; font-size: .86rem; margin-bottom: 12px;
}
/* Overnight the solar station is expected to be silent, so the banner drops its
   alarm-red for a calm slate/blue tone (see isSolarNight() in app.js). */
.banner.night {
  background: color-mix(in srgb, var(--accent) 10%, var(--card));
  border-color: color-mix(in srgb, var(--accent) 30%, var(--card-brd));
}

/* Cards */
.card {
  background: var(--card); border: 1px solid var(--card-brd);
  border-radius: 18px; box-shadow: var(--shadow); padding: 16px; margin-bottom: 12px;
}

/* Wind hero */
.wind-card { text-align: center; }
.wind-hero { position: relative; width: min(210px, 58vw); aspect-ratio: 1; margin: 2px auto 4px; }
.rose { width: 100%; height: 100%; display: block; overflow: visible; }
.rose-ring { fill: none; stroke: var(--card-brd); stroke-width: 2; }
.rose-card { fill: var(--muted); font-size: 11px; font-weight: 700; text-anchor: middle; dominant-baseline: middle; }
.arrow { fill: var(--accent); }
/* The direction arrow glides to its new bearing; app.js turns it the short way. */
#wind-arrow { transform-box: view-box; transform-origin: center; transition: transform .6s cubic-bezier(.22, .61, .36, 1); }
@media (prefers-reduced-motion: reduce) { #wind-arrow { transition: none; } }
.launch-arc { fill: none; stroke: var(--muted); stroke-width: 6; opacity: .4; stroke-linecap: round; }
.wind-center { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; pointer-events: none; }
.wind-speed { font-size: 3.1rem; font-weight: 800; line-height: 1; letter-spacing: -1px; }
.wind-unit { color: var(--muted); font-size: .9rem; margin-top: 2px; }
.wind-meta { display: flex; justify-content: center; gap: 18px; flex-wrap: wrap; font-size: .95rem; color: var(--muted); }
.wind-meta b { color: var(--text); font-size: 1.05rem; }
.wind-meta .lbl { color: var(--muted); }
.muted { color: var(--muted2); }

/* Wind unit toggle (m/s ⇄ km/h) — centred by .wind-card's text-align */
.unit-toggle {
  display: inline-flex; margin-top: 12px; padding: 3px; gap: 2px;
  background: color-mix(in srgb, var(--card-brd) 25%, var(--card));
  border: 1px solid var(--card-brd); border-radius: 999px;
}
.unit-btn {
  appearance: none; -webkit-appearance: none; border: 0; background: transparent;
  color: var(--muted); font: inherit; font-size: .8rem; font-weight: 600; line-height: 1;
  padding: 5px 14px; border-radius: 999px; cursor: pointer; transition: background .15s, color .15s;
}
.unit-btn:hover { color: var(--text); }
.unit-btn.active { background: var(--accent); color: var(--bg); }
.unit-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* Metric grid */
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 12px; }
.tile {
  background: var(--card); border: 1px solid var(--card-brd);
  border-radius: 16px; box-shadow: var(--shadow); padding: 13px 14px; min-height: 78px;
}
.tile .k { color: var(--muted); font-size: .78rem; margin-bottom: 6px; }
.tile .v { font-size: 1.7rem; font-weight: 750; display: flex; align-items: baseline; gap: 4px; }
.tile .v .u { font-size: .85rem; color: var(--muted); font-weight: 500; }
/* Station health */
.health { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 16px; }
.chip {
  background: var(--card); border: 1px solid var(--card-brd); border-radius: 999px;
  padding: 7px 13px; font-size: .82rem; color: var(--muted); box-shadow: var(--shadow);
}
.chip b { color: var(--text); }
.chip-ic { margin-right: 3px; }
.chip.batt-warn, .chip.sig-warn { border-color: color-mix(in srgb, var(--gust) 55%, var(--card-brd)); }
.chip.batt-warn b, .chip.sig-warn b { color: var(--gust); }
.chip.batt-crit, .chip.sig-crit, .chip.chip-err { border-color: color-mix(in srgb, var(--bad) 60%, var(--card-brd)); background: color-mix(in srgb, var(--bad) 12%, var(--card)); }
.chip.batt-crit b, .chip.sig-crit b, .chip.chip-err b { color: var(--bad); }

/* Footer */
.foot { margin-top: 20px; color: var(--muted2); font-size: .74rem; text-align: center; }
.foot-links { margin-top: 6px; display: flex; gap: 8px; justify-content: center; }
.foot a { color: var(--muted); }
/* Transmission diagnostics (seq / station counter) — deliberately the quietest
   text on the page: useful when debugging the WiFi link, noise for a pilot. */
.diag { margin-top: 4px; font-size: .7rem; opacity: .75; }