:root {
  --bg: #f5f3f0;
  --card: #ffffff;
  --text: #23211e;
  --muted: #7a756e;
  --accent: #e85d2a;
  --accent-dark: #c94817;
  --ok: #2e8b57;
  --warn: #c9a227;
  --err: #c0392b;
  --line: #e7e2dc;
  --radius: 16px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17161a;
    --card: #211f24;
    --text: #f0eeeb;
    --muted: #a09a92;
    --line: #33303a;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "SF Pro Text", system-ui, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  padding-bottom: 40px;
}
.view { max-width: 560px; margin: 0 auto; padding: 12px; }
.hidden { display: none !important; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.error { color: var(--err); }

header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 4px 14px;
}
header h1 { font-size: 24px; margin: 0; }
.header-right { display: flex; align-items: center; gap: 10px; }

.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
  box-shadow: 0 1px 3px rgba(0,0,0,.06);
}
h3 { margin: 4px 0 10px; font-size: 15px; }

/* login */
.login-box { margin-top: 18vh; text-align: center; padding: 32px 20px; }
.logo { font-size: 44px; }
.login-box h1 { font-size: 26px; }

/* buttons */
.btn {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--text);
  font-size: 16px;
  border-radius: 12px;
  padding: 12px 18px;
  cursor: pointer;
}
.btn:active { transform: scale(.98); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
.btn.primary:disabled { opacity: .5; }
.btn.big { width: 100%; padding: 16px; font-size: 18px; }
.btn.subtle { background: transparent; border-color: transparent; color: var(--muted); }
.btn.small-btn { display: block; margin: 8px auto 0; }
.icon-btn { background: none; border: none; font-size: 22px; cursor: pointer; }

.btn.danger {
  border-color: color-mix(in srgb, var(--err) 55%, transparent);
  color: var(--err);
}
.btn.danger:active { background: color-mix(in srgb, var(--err) 12%, transparent); }
.badge {
  font-size: 12px; padding: 4px 10px; border-radius: 999px;
  background: var(--line); color: var(--muted);
}
.badge.online { background: color-mix(in srgb, var(--ok) 18%, transparent); color: var(--ok); }
.badge.offline { background: color-mix(in srgb, var(--err) 15%, transparent); color: var(--err); }

/* status */
.status-card { padding: 20px 16px; }
.temp-row { display: flex; align-items: center; justify-content: space-between; }
.temp { font-size: 64px; font-weight: 700; letter-spacing: -2px; }
.temp .unit { font-size: 24px; font-weight: 400; color: var(--muted); margin-left: 2px; }
.side { text-align: right; display: grid; gap: 4px; }
.relay { font-weight: 600; }
.relay.on { color: var(--accent); }
.relay.off { color: var(--muted); }
.pending {
  margin-top: 12px; padding: 8px 12px; border-radius: 10px;
  background: color-mix(in srgb, var(--warn) 15%, transparent);
  color: var(--warn); font-size: 14px; text-align: center;
}

/* modes */
.modes { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.mode-btn {
  padding: 16px 8px; font-size: 17px; border-radius: 12px;
  border: 1.5px solid var(--line); background: var(--card); color: var(--text);
  cursor: pointer;
}
.mode-btn.active {
  border-color: var(--accent); color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  font-weight: 700;
}
.mode-btn.danger.active { border-color: var(--err); color: var(--err); background: color-mix(in srgb, var(--err) 10%, transparent); }
.mode-desc { min-height: 18px; margin: 8px 2px 0; }

/* steppers */
.band-row { display: flex; align-items: center; gap: 12px; margin: 8px 0; }
.band-row .muted:first-child { width: 84px; }
.stepper { display: flex; align-items: center; gap: 6px; }
.step-btn {
  width: 44px; height: 44px; border-radius: 12px; font-size: 22px;
  border: 1px solid var(--line); background: var(--card); color: var(--text);
  cursor: pointer;
}
.step-btn:active { background: var(--line); }
.stepper .val { min-width: 52px; text-align: center; font-size: 19px; font-weight: 600; }
.stepper.dirty .val { color: var(--accent); font-weight: 700; }

/* unsaved-edit hint */
.draft-hint {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  margin: -4px 2px 12px; padding: 8px 12px; border-radius: 10px;
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  font-size: 13px; color: var(--muted);
}
.dirty-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--accent); flex-shrink: 0;
}
.linklike {
  background: none; border: none; padding: 0;
  color: var(--muted); text-decoration: underline;
  font-size: 13px; cursor: pointer;
}

/* chart */
#chart svg { width: 100%; height: 160px; display: block; }
.legend { margin-top: 6px; }
.sw { display: inline-block; width: 14px; height: 8px; border-radius: 4px; vertical-align: middle; margin-right: 4px; }
.temp-sw { background: var(--accent); }
.heat-sw { background: color-mix(in srgb, var(--accent) 25%, transparent); }

/* admin */
.row { display: flex; gap: 8px; align-items: center; }
.row .input { flex: 1; min-width: 0; }   /* else intrinsic input width overflows the card */
.row .btn { flex-shrink: 0; white-space: nowrap; }
.input {
  padding: 12px; border-radius: 12px; border: 1px solid var(--line);
  background: var(--card); color: var(--text); font-size: 16px;
}
.qr-out { text-align: center; margin-top: 14px; }
.qr-out img { width: 220px; height: 220px; image-rendering: pixelated; }
.qr-row { display: flex; gap: 8px; align-items: center; margin-top: 8px; }
.qr-url {
  flex: 1; min-width: 0; text-align: left; font-size: 13px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  color: var(--muted);
}
.qr-row .btn { flex-shrink: 0; padding: 8px 14px; font-size: 14px; }
.list-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 0; border-bottom: 1px solid var(--line); gap: 8px;
}
.list-item:last-child { border-bottom: none; }
.list-item .meta { font-size: 13px; }
.audit { max-height: 300px; overflow-y: auto; font-size: 13px; }
.audit .list-item { padding: 6px 0; }

/* toast */
.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%);
  background: var(--text); color: var(--bg);
  padding: 10px 18px; border-radius: 12px; font-size: 14px;
  max-width: 90vw; text-align: center; z-index: 10;
}