:root {
  --bg: #f4f6fb;
  --panel: #ffffff;
  --text: #1c2430;
  --muted: #64708a;
  --border: #dde3ee;
  --accent: #1f6feb;
  --accent-soft: #e7f0ff;
  --temp: #e8590c;
  --hum: #1f9ed4;
  --ok: #2fb344;
  --warn: #e0a400;
  --err: #d64545;
  --shadow: 0 8px 24px rgba(20, 40, 80, .10);
}
[data-theme="dark"] {
  --bg: #0e1116;
  --panel: #171c24;
  --text: #e8edf5;
  --muted: #93a0b5;
  --border: #28303c;
  --accent: #5b9bff;
  --accent-soft: #1b2a44;
  --temp: #ff8a4c;
  --hum: #56c3ee;
  --ok: #45d06a;
  --warn: #f0c000;
  --err: #ff6b6b;
  --shadow: 0 8px 24px rgba(0, 0, 0, .45);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  -webkit-font-smoothing: antialiased;
  padding-bottom: env(safe-area-inset-bottom);
  overflow-x: hidden;
}

header {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; padding: 14px 16px calc(14px + env(safe-area-inset-top)) 16px;
  padding-top: calc(14px + env(safe-area-inset-top));
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 12px; min-width: 0; }
.logo { font-size: 26px; line-height: 1; }
.brand h1 { font-size: 18px; margin: 0; letter-spacing: -.2px; }
.brand .sub { font-size: 12px; color: var(--muted); margin-top: 1px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.header-actions { display: flex; align-items: center; gap: 8px; }
.status { width: 10px; height: 10px; border-radius: 50%; background: var(--muted); box-shadow: 0 0 0 4px color-mix(in srgb, var(--muted) 20%, transparent); }
.status.ok { background: var(--ok); box-shadow: 0 0 0 4px color-mix(in srgb, var(--ok) 20%, transparent); }
.status.err { background: var(--err); box-shadow: 0 0 0 4px color-mix(in srgb, var(--err) 20%, transparent); }
.icon-btn {
  border: 1px solid var(--border); background: var(--panel); color: var(--text);
  width: 40px; height: 40px; border-radius: 12px; font-size: 18px; cursor: pointer;
}
.icon-btn:active { transform: scale(.96); }

main { padding: 14px; max-width: 1100px; margin: 0 auto; display: grid; gap: 14px; }
main > * { min-width: 0; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 10px; }
.card {
  background: var(--panel); border: 1px solid var(--border); border-radius: 16px;
  padding: 14px; box-shadow: var(--shadow);
}
.card .k { font-size: 12px; color: var(--muted); display: flex; align-items: center; gap: 6px; }
.card .v { font-size: 26px; font-weight: 700; margin-top: 6px; letter-spacing: -.5px; }
.card .v small { font-size: 14px; font-weight: 500; color: var(--muted); }
.card.temp .v { color: var(--temp); }
.card.hum .v { color: var(--hum); }
.card.wide { grid-column: 1 / -1; }

.panel {
  background: var(--panel); border: 1px solid var(--border); border-radius: 16px;
  box-shadow: var(--shadow); padding: 12px; overflow: hidden;
}
.controls { display: grid; gap: 10px; margin-bottom: 6px; }
.presets { display: flex; flex-wrap: wrap; gap: 8px; }
.presets button, .seg button {
  border: 1px solid var(--border); background: var(--bg); color: var(--text);
  padding: 8px 14px; border-radius: 999px; font-size: 13px; cursor: pointer; font-weight: 600;
}
.presets button.active, .seg button.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.custom-range { display: flex; flex-wrap: wrap; align-items: end; gap: 8px; }
.custom-range label { display: grid; gap: 4px; font-size: 11px; color: var(--muted); flex: 1 1 140px; min-width: 0; }
.custom-range input {
  border: 1px solid var(--border); background: var(--bg); color: var(--text);
  border-radius: 10px; padding: 8px 10px; font-size: 13px; width: 100%; min-width: 0; max-width: 100%;
}
.btn {
  border: none; background: var(--accent); color: #fff; border-radius: 10px;
  padding: 9px 16px; font-size: 13px; font-weight: 600; cursor: pointer;
}
.btn:active { filter: brightness(.94); }
.toggles { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; }
.chk { display: inline-flex; align-items: center; gap: 7px; font-size: 13px; cursor: pointer; }
.chk input { accent-color: var(--accent); width: 16px; height: 16px; }
.seg { display: inline-flex; gap: 0; margin-left: auto; }
.seg button { border-radius: 0; padding: 8px 14px; }
.seg button:first-child { border-radius: 999px 0 0 999px; }
.seg button:last-child { border-radius: 0 999px 999px 0; border-left: none; }

#chart { width: 100%; height: 56vh; min-height: 320px; }
.hint { color: var(--muted); font-size: 13px; text-align: center; padding: 20px; }
.foot { color: var(--muted); font-size: 12px; text-align: center; padding: 4px 0 20px; }

@media (max-width: 520px) {
  .brand h1 { font-size: 16px; }
  #chart { height: 50vh; min-height: 280px; }
  .seg { margin-left: 0; }
}