/* Thermocloud — mobile-first dashboard stylesheet
   System fonts only; no frameworks. ~10 KB gzipped. */

:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --ink: #17203a;
  --ink-2: #5b6478;
  --line: #e3e8f2;
  --accent: #ff6b3d;
  --accent-2: #ff8a5f;
  --good: #22c07a;
  --bad: #e5484d;
  --chip: #eef1f8;
  --shadow: 0 1px 2px rgba(23, 32, 58, .06), 0 8px 24px rgba(23, 32, 58, .07);
  --radius: 16px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1526;
    --card: #171f33;
    --ink: #e8ecf6;
    --ink-2: #9aa4bd;
    --line: #2a3550;
    --chip: #222c47;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .35);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.45;
}
h1, h2, h3 { margin: 0; font-weight: 700; letter-spacing: -.01em; }
p { margin: .4em 0; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.muted { color: var(--ink-2); }
.small { font-size: .82rem; }

/* ---------- layout ---------- */
.wrap { max-width: 1080px; margin: 0 auto; padding: 14px 14px 90px; }

.topbar {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: 1080px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 14px;
}
.brand-row { display: flex; align-items: center; gap: 8px; }
.brand-name { font-weight: 800; font-size: 1.05rem; }
.brand-logo { width: 30px; height: 30px; }
.brand-logo.sm { width: 22px; height: 22px; }

/* ---------- cards & grid ---------- */
.grid { display: grid; grid-template-columns: 1fr; gap: 14px; margin-top: 14px; }
@media (min-width: 860px) {
  .grid { grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr); align-items: start; }
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
}
.card-title { font-size: .95rem; color: var(--ink-2); margin-bottom: 12px; }
.col { display: grid; gap: 14px; }

/* ---------- auth ---------- */
.auth-card {
  max-width: 400px; margin: 8vh auto 0;
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 28px 24px;
}
.auth-card form { display: grid; gap: 6px; margin-top: 14px; }
.auth-alt { text-align: center; margin-top: 16px; font-size: .9rem; }
.brand { text-align: center; margin-bottom: 6px; }
.brand h1 { font-size: 1.5rem; }

/* ---------- forms ---------- */
label { font-size: .86rem; color: var(--ink-2); margin-top: 8px; display: block; }
input {
  width: 100%; padding: 11px 12px; font-size: 1rem;
  border: 1px solid var(--line); border-radius: 10px;
  background: var(--bg); color: var(--ink); outline: none;
}
input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 22%, transparent); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  border: 1px solid transparent; border-radius: 10px;
  font-size: .95rem; font-weight: 600; cursor: pointer;
  padding: 10px 16px; color: var(--ink); background: var(--chip);
  transition: transform .06s ease, filter .15s ease;
  -webkit-tap-highlight-color: transparent;
}
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { filter: brightness(1.05); }
.btn-ghost { background: transparent; border-color: var(--line); color: var(--ink); }
.btn-danger { background: transparent; border-color: color-mix(in srgb, var(--bad) 40%, var(--line)); color: var(--bad); }
.btn-block { width: 100%; margin-top: 14px; }
.btn-sm { padding: 7px 12px; font-size: .86rem; }
.btn-round {
  width: 56px; height: 56px; border-radius: 50%;
  font-size: 1.7rem; font-weight: 500; line-height: 1;
  background: var(--chip); border: 1px solid var(--line);
  user-select: none;
}
.btn-round:disabled { opacity: .4; cursor: default; }
.btn:disabled { pointer-events: none; }

/* ---------- alerts & toasts ---------- */
.alert {
  background: color-mix(in srgb, var(--bad) 12%, var(--card));
  border: 1px solid color-mix(in srgb, var(--bad) 45%, var(--line));
  color: var(--bad); border-radius: 10px; padding: 10px 12px;
  font-size: .9rem; margin: 12px 0;
}
.toasts {
  position: fixed; left: 50%; bottom: 18px; transform: translateX(-50%);
  display: grid; gap: 8px; z-index: 60; width: min(92vw, 420px);
}
.toast {
  background: var(--ink); color: var(--bg);
  padding: 11px 14px; border-radius: 12px; font-size: .9rem;
  box-shadow: var(--shadow); opacity: 0; transform: translateY(8px);
  transition: all .25s ease;
}
.toast.show { opacity: 1; transform: none; }

/* ---------- chips (device selector) ---------- */
.chips {
  display: flex; gap: 8px; overflow-x: auto; padding: 4px 2px 8px;
  scrollbar-width: none;
}
.chips::-webkit-scrollbar { display: none; }
.chip {
  flex: 0 0 auto; border: 1px solid var(--line); background: var(--card);
  color: var(--ink); border-radius: 999px; padding: 8px 14px;
  font-size: .9rem; font-weight: 600; cursor: pointer;
}
.chip.active { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.chip .dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; margin-right: 6px; background: var(--bad); }
.chip .dot.on { background: var(--good); }

/* ---------- thermostat card ---------- */
.thermostat-card { display: flex; flex-direction: column; gap: 18px; }
.dev-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.dev-name { font-size: 1.25rem; }

.badge {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: .82rem; font-weight: 600; color: var(--ink-2);
  background: var(--chip); border-radius: 999px; padding: 6px 12px;
}
.badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--bad); }
.badge.online .dot { background: var(--good); animation: pulse 2s infinite; }
.badge.fault { color: var(--bad); }
@keyframes pulse { 50% { opacity: .45; } }

.gauge-box { position: relative; margin: 4px auto 0; width: min(100%, 340px); }
.gauge-box svg { width: 100%; display: block; }
.gauge-track, .gauge-arc {
  fill: none; stroke-linecap: round; stroke-width: 14;
}
.gauge-track { stroke: var(--chip); }
.gauge-arc {
  stroke: url(#gauge-grad, var(--accent));
  stroke: var(--accent);
  transition: stroke-dashoffset .6s ease;
}
.gauge-center {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding-top: 26px;
}
.big-temp { font-size: 3.2rem; font-weight: 800; letter-spacing: -.03em; line-height: 1; }
.big-temp .unit, .sp .unit { font-size: 1.1rem; font-weight: 600; color: var(--ink-2); margin-left: 2px; }
.heating-flame {
  position: absolute; top: 6px; right: 4px;
  display: inline-flex; align-items: center; gap: 5px;
  color: var(--accent); font-size: .8rem; font-weight: 700;
}

.setpoint-row {
  display: flex; align-items: center; justify-content: center; gap: 26px;
  margin-top: 4px;
}
.setpoint-value { text-align: center; min-width: 110px; }
.sp { font-size: 2.1rem; font-weight: 800; }

.segmented {
  display: grid; grid-template-columns: 1fr 1fr; gap: 4px;
  background: var(--chip); border-radius: 12px; padding: 4px;
}
.segmented-3 { grid-template-columns: 1fr 1fr 1fr; }
.seg {
  border: 0; background: transparent; color: var(--ink-2);
  font-weight: 700; font-size: .95rem; padding: 10px;
  border-radius: 9px; cursor: pointer;
}
.seg.active { background: var(--card); color: var(--ink); box-shadow: var(--shadow); }
.seg-sm .seg { padding: 6px 12px; font-size: .82rem; }

/* OTA update banner */
.update-banner {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  margin-top: 14px; padding: 12px 16px;
  background: color-mix(in srgb, var(--accent) 12%, var(--card));
  border: 1px solid color-mix(in srgb, var(--accent) 45%, var(--line));
  border-radius: var(--radius); font-size: .92rem;
}

/* discovered devices */
.disc-row {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 10px 4px; border-bottom: 1px dashed var(--line); font-size: .9rem;
}
.disc-row:last-child { border-bottom: 0; }

.chart-head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 10px; margin-bottom: 12px;
}
.chart-head .card-title { margin-bottom: 0; }

/* ---------- info card ---------- */
.kv { margin: 0; display: grid; gap: 8px; }
.kv > div { display: flex; justify-content: space-between; gap: 12px; border-bottom: 1px dashed var(--line); padding-bottom: 8px; }
.kv dt { color: var(--ink-2); font-size: .88rem; }
.kv dd { margin: 0; font-weight: 600; font-size: .92rem; text-align: right; word-break: break-all; }
.dev-actions { display: flex; gap: 8px; margin-top: 14px; flex-wrap: wrap; }

/* ---------- chart ---------- */
.chart-card { margin-top: 14px; }
.chart-box { position: relative; height: 260px; }
@media (min-width: 860px) { .chart-box { height: 300px; } }

/* ---------- empty state ---------- */
.empty-state {
  text-align: center; background: var(--card);
  border: 1px dashed var(--line); border-radius: var(--radius);
  padding: 46px 20px; margin-top: 20px;
}
.empty-art { font-size: 2.6rem; }

/* ---------- dialogs ---------- */
.dlg {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--card); color: var(--ink);
  padding: 22px; width: min(92vw, 420px);
  box-shadow: var(--shadow);
}
.dlg::backdrop { background: rgba(10, 14, 25, .55); backdrop-filter: blur(2px); }
.dlg form { display: grid; gap: 6px; }
.dlg-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 16px; }

@media (max-width: 480px) {
  .big-temp { font-size: 2.7rem; }
  .btn-round { width: 52px; height: 52px; }
}