:root {
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #eef2f5;
  color: #18212b;
  --bg: #eef2f5;
  --surface: #ffffff;
  --surface-soft: #f7f9fb;
  --line: #d8e0e7;
  --text: #18212b;
  --muted: #64717f;
  --primary: #176b87;
  --primary-dark: #105169;
  --primary-soft: #e3f1f5;
  --success: #17804a;
  --success-soft: #dff4e9;
  --danger: #b23b35;
  --danger-soft: #f8e5e2;
  --amber: #b56b12;
  --amber-soft: #fff0d7;
  --shadow: 0 18px 48px rgba(33, 47, 61, .12);
}

* { box-sizing: border-box; }

html { background: var(--bg); }

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(180deg, rgba(255,255,255,.75) 0, rgba(238,242,245,.7) 260px),
    var(--bg);
  color: var(--text);
}

.app-shell {
  width: min(1180px, 100%);
  margin: 0 auto;
  padding: 22px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  padding: 10px 0 18px;
}

h1, h2 { margin: 0; letter-spacing: 0; }
h1 { font-size: 30px; line-height: 1.1; }
h2 { font-size: 18px; margin-top: 24px; }

button, select, input {
  min-height: 42px;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 8px;
  padding: 10px 12px;
  color: inherit;
  font: inherit;
}

button {
  cursor: pointer;
  font-weight: 700;
  transition: transform .12s ease, border-color .12s ease, background .12s ease, box-shadow .12s ease;
}

button:hover { transform: translateY(-1px); border-color: #afbdc9; }
button:active { transform: translateY(0); }
button.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
button.primary:hover { background: var(--primary-dark); }
button.danger { border-color: #e3b2ad; color: var(--danger); background: #fffafa; }
button:disabled, select:disabled, input:disabled { opacity: .6; cursor: wait; transform: none; }

label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 750;
}

label select, label input { color: var(--text); font-weight: 500; }

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.status-strip,
.panel,
.card,
.device-choice,
.climate-hero,
.temperature-card,
.power-card {
  background: rgba(255, 255, 255, .92);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.status-strip {
  padding: 14px;
  margin-bottom: 16px;
}

.cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
}

.cols strong {
  display: block;
  font-size: 12px;
  text-transform: uppercase;
  color: #43515e;
}

.muted { color: var(--muted); }
.monospace, code { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; }

.device-rail {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 10px;
  margin: 4px 0 16px;
}

.device-choice {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 76px;
  padding: 14px;
  text-align: left;
}

.device-choice.active {
  border-color: #7db7c8;
  background: linear-gradient(180deg, #ffffff 0, var(--primary-soft) 100%);
  box-shadow: 0 18px 50px rgba(23, 107, 135, .18);
}

.device-main { min-width: 0; }
.device-main strong { display: block; font-size: 16px; }
.device-main small {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-weight: 550;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.device-meta {
  display: grid;
  justify-items: end;
  gap: 6px;
  font-weight: 800;
}

.dashboard {
  display: grid;
  gap: 14px;
}

.climate-hero {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 16px;
  overflow: hidden;
  padding: 18px;
  background:
    linear-gradient(135deg, rgba(23, 107, 135, .14), rgba(255, 255, 255, .95) 48%),
    var(--surface);
}

.hero-copy {
  display: grid;
  align-content: center;
  min-width: 0;
}

.eyebrow {
  color: var(--primary);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.hero-copy h2 {
  margin-top: 4px;
  font-size: 32px;
  line-height: 1.1;
  overflow-wrap: anywhere;
}

.hero-status {
  min-width: 148px;
  display: grid;
  align-content: center;
  justify-items: end;
  gap: 4px;
  text-align: right;
}

.hero-status strong { font-size: 44px; line-height: 1; }
.hero-status small { color: var(--muted); font-weight: 700; }

.state {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 4px 9px;
  border-radius: 999px;
  background: #e8edf2;
  color: #43515e;
  font-size: 12px;
  font-weight: 900;
}

.state.on { background: var(--success-soft); color: var(--success); }
.state.off { background: #edf1f4; color: #43515e; }
.state.online { background: var(--amber-soft); color: var(--amber); }
.state.err { background: var(--danger-soft); color: var(--danger); }

.control-board {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(210px, .7fr);
  gap: 14px;
}

.temperature-card,
.power-card,
.panel {
  padding: 16px;
}

.temperature-card {
  display: grid;
  align-content: center;
  gap: 18px;
}

.section-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.section-title span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 850;
  text-transform: uppercase;
}

.section-title strong {
  font-size: 24px;
  line-height: 1;
}

.temperature-slider {
  width: 100%;
  min-height: 34px;
  padding: 0;
  accent-color: var(--primary);
  appearance: none;
  background: transparent;
}

.temperature-slider::-webkit-slider-runnable-track {
  height: 10px;
  border-radius: 999px;
  background: linear-gradient(90deg, #7bbfd5, #f0cc7a, #df7670);
}

.temperature-slider::-webkit-slider-thumb {
  width: 28px;
  height: 28px;
  margin-top: -9px;
  border: 3px solid #fff;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 4px 14px rgba(16, 81, 105, .35);
  appearance: none;
}

.temperature-slider::-moz-range-track {
  height: 10px;
  border-radius: 999px;
  background: linear-gradient(90deg, #7bbfd5, #f0cc7a, #df7670);
}

.temperature-slider::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border: 3px solid #fff;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 4px 14px rgba(16, 81, 105, .35);
}

.slider-scale {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.power-card {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.power-button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 74px;
  padding: 14px;
  text-align: left;
}

.power-button span { color: var(--muted); font-size: 13px; }
.power-button strong { font-size: 24px; }
.power-button.on { background: var(--success-soft); border-color: #9ed7b7; color: var(--success); }
.power-button.off { background: var(--danger-soft); border-color: #efb8b2; color: var(--danger); }

.mode-panel,
.fan-panel {
  box-shadow: none;
}

.segmented,
.quick-grid,
.control-grid {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.segmented {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.segmented.compact {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.segmented button,
.quick-grid button {
  background: var(--surface-soft);
  min-width: 0;
}

.segmented button.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.quick-grid {
  grid-template-columns: repeat(6, minmax(0, 1fr));
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.metric {
  min-height: 82px;
  padding: 12px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--surface-soft);
}

.metric span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 850;
}

.metric strong {
  display: block;
  margin-top: 8px;
  font-size: 24px;
}

.advanced-panel summary,
.diagnostics summary {
  cursor: pointer;
  font-weight: 850;
}

.control-grid {
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.timer-panel { margin-top: 10px; }
.stack { display: grid; gap: 10px; margin-top: 12px; }

.timer-form {
  display: grid;
  grid-template-columns: 1fr 130px minmax(140px, 1fr) auto;
  gap: 8px;
  margin-top: 2px;
}

.timer-row {
  display: grid;
  grid-template-columns: 1fr auto auto auto;
  gap: 8px;
  align-items: center;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.timer-error {
  margin-top: 6px;
  color: var(--danger);
  font-size: 13px;
  font-weight: 750;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
  margin-top: 14px;
}

.card { padding: 14px; }
.tag {
  display: inline-block;
  margin: 6px 6px 0 0;
  padding: 4px 7px;
  border-radius: 999px;
  background: #e8edf2;
  font-size: 12px;
  font-weight: 750;
}

.diagnostics {
  margin-top: 18px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255,255,255,.75);
}

pre {
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 12px;
  margin: 12px 0 0;
}

.empty {
  padding: 16px;
  color: var(--muted);
  border: 1px dashed #b8c5cf;
  border-radius: 8px;
  background: rgba(255,255,255,.55);
}

.compact-empty { padding: 12px; }

.login-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background:
    linear-gradient(140deg, rgba(23,107,135,.16), transparent 46%),
    var(--bg);
}

.login-shell { width: min(420px, calc(100vw - 32px)); padding: 0; }

.login-panel {
  display: grid;
  gap: 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 24px;
}

@media (max-width: 920px) {
  .app-shell { padding: 16px; }
  .topbar { align-items: flex-start; }
  .toolbar { width: 100%; justify-content: stretch; }
  .toolbar button { flex: 1 1 140px; }
  .cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .device-rail {
    display: flex;
    overflow-x: auto;
    padding-bottom: 4px;
    scroll-snap-type: x mandatory;
  }
  .device-choice {
    flex: 0 0 min(82vw, 310px);
    scroll-snap-align: start;
  }
  .control-board { grid-template-columns: 1fr; }
  .quick-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .timer-row, .timer-form { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .app-shell { padding: 12px; }
  h1 { font-size: 26px; }
  .climate-hero { display: grid; }
  .hero-status {
    min-width: 0;
    justify-items: start;
    text-align: left;
  }
  .hero-status strong { font-size: 40px; }
  .hero-copy h2 { font-size: 28px; }
  .cols,
  .metric-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .segmented,
  .segmented.compact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .quick-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  button, select, input { min-height: 46px; }
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #111820;
    --surface: #1b242d;
    --surface-soft: #202b35;
    --line: #334350;
    --text: #edf3f7;
    --muted: #aab6c1;
    --primary: #4da6c0;
    --primary-dark: #66bdd5;
    --primary-soft: #14313b;
    --success-soft: #143322;
    --danger-soft: #3f211f;
    --amber-soft: #3b2b16;
    --shadow: none;
  }
  body {
    background:
      linear-gradient(180deg, rgba(77,166,192,.10) 0, rgba(17,24,32,.5) 280px),
      var(--bg);
  }
  .status-strip,
  .panel,
  .card,
  .device-choice,
  .climate-hero,
  .temperature-card,
  .power-card,
  .login-panel {
    background: rgba(27, 36, 45, .94);
  }
  button, select, input { background: var(--surface); border-color: var(--line); }
  button.danger { background: #2a1c1b; color: #ffb2ab; }
  .device-choice.active {
    background: linear-gradient(180deg, #1b242d 0, #14313b 100%);
    border-color: #477f91;
  }
  .climate-hero {
    background:
      linear-gradient(135deg, rgba(77,166,192,.16), rgba(27,36,45,.95) 48%),
      var(--surface);
  }
  .power-button.on { color: #8ee0ad; border-color: #2d7d51; }
  .power-button.off { color: #ffb2ab; border-color: #7f3b35; }
  .empty, .diagnostics { background: rgba(27, 36, 45, .65); }
  .tag { background: #293641; }
}