:root {
  --bg: #0e1116;
  --card: #171b22;
  --card-2: #1f242d;
  --line: #2a303b;
  --text: #e8eaee;
  --muted: #8b93a1;
  --accent: #f5a524;
  --accent-ink: #1b1302;
  --ok: #34c77b;
  --warn: #f5a524;
  --bad: #f2555a;
  --blue: #4c8dff;
  --radius: 20px;
  --shadow: 0 1px 0 rgba(255,255,255,.03) inset, 0 10px 30px rgba(0,0,0,.25);
  color-scheme: dark;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f4f5f7; --card: #ffffff; --card-2: #f0f2f5; --line: #e3e6eb;
    --text: #15181d; --muted: #6b7280; --shadow: 0 1px 2px rgba(0,0,0,.05), 0 8px 24px rgba(0,0,0,.06);
    color-scheme: light;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); }
body {
  font: 15px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
  -webkit-tap-highlight-color: transparent;
}
button, select, input { font: inherit; color: inherit; }

.top { display: flex; align-items: center; justify-content: space-between; padding: 22px 18px 8px; max-width: 1280px; margin: 0 auto; }
.top h1 { margin: 0; font-size: 30px; letter-spacing: -.02em; }
.sub { margin: 2px 0 0; color: var(--muted); font-size: 14px; }
.conn span { display: block; width: 10px; height: 10px; border-radius: 50%; background: var(--muted); transition: background .3s; }
.conn.live span { background: var(--ok); box-shadow: 0 0 0 4px color-mix(in srgb, var(--ok) 20%, transparent); }
.conn.down span { background: var(--bad); }

.grid { display: grid; gap: 14px; padding: 10px 14px 40px; max-width: 1280px; margin: 0 auto; grid-template-columns: minmax(0, 1fr); align-items: start; }
@media (min-width: 720px) { .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1100px) { .grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }

.card { min-width: 0; background: var(--card); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow); border: 1px solid var(--line); position: relative; min-height: 120px; }
.card:empty { display: none; }
.card.busy::after { content: ""; position: absolute; top: 18px; right: 18px; width: 16px; height: 16px; border-radius: 50%;
  border: 2px solid var(--line); border-top-color: var(--accent); animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.head { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; padding-right: 26px; }
.icon { width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center; background: var(--card-2); flex: none; }
.icon svg { width: 22px; height: 22px; }
.icon.on { background: color-mix(in srgb, var(--accent) 22%, transparent); color: var(--accent); }
.head h2 { margin: 0; font-size: 17px; }
.head .state { color: var(--muted); font-size: 13px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.head .titles { min-width: 0; flex: 1; }
.head .right { margin-left: auto; }

.err { background: color-mix(in srgb, var(--bad) 14%, transparent); color: color-mix(in srgb, var(--bad) 70%, var(--text)); border-radius: 12px; padding: 8px 12px; font-size: 13px; margin-bottom: 10px; word-break: break-word; }
.stale { opacity: .6; }

.row { display: flex; align-items: center; gap: 10px; }
.row.end { justify-content: flex-end; }
.row.wrap { flex-wrap: wrap; }
.stack > * + * { margin-top: 10px; }
.label { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .06em; margin: 14px 0 8px; }

.item { display: flex; align-items: center; gap: 12px; padding: 10px 12px; background: var(--card-2); border-radius: 14px; }
.item + .item { margin-top: 8px; }
.item .name { flex: 1; min-width: 0; }
.item .name small { display: block; color: var(--muted); font-size: 12px; }

/* toggle switch */
.switch { position: relative; width: 50px; height: 30px; flex: none; border: 0; border-radius: 999px; background: var(--line); cursor: pointer; transition: background .2s; padding: 0; }
.switch::after { content: ""; position: absolute; top: 3px; left: 3px; width: 24px; height: 24px; border-radius: 50%; background: #fff; transition: transform .2s; box-shadow: 0 1px 3px rgba(0,0,0,.3); }
.switch[aria-checked="true"] { background: var(--accent); }
.switch[aria-checked="true"]::after { transform: translateX(20px); }
.switch:disabled { opacity: .5; cursor: default; }

/* slider */
input[type=range] { -webkit-appearance: none; appearance: none; width: 100%; height: 34px; background: transparent; margin: 0; touch-action: pan-y; }
input[type=range]::-webkit-slider-runnable-track { height: 8px; border-radius: 999px; background: linear-gradient(to right, var(--fill, var(--accent)) var(--p, 50%), var(--line) var(--p, 50%)); }
input[type=range]::-moz-range-track { height: 8px; border-radius: 999px; background: var(--line); }
input[type=range]::-moz-range-progress { height: 8px; border-radius: 999px; background: var(--fill, var(--accent)); }
input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 24px; height: 24px; border-radius: 50%; background: #fff; margin-top: -8px; box-shadow: 0 1px 4px rgba(0,0,0,.35); }
input[type=range]::-moz-range-thumb { width: 24px; height: 24px; border: 0; border-radius: 50%; background: #fff; box-shadow: 0 1px 4px rgba(0,0,0,.35); }
input[type=range]:disabled { opacity: .4; }
.slider { display: flex; align-items: center; gap: 10px; }
.slider .val { width: 42px; text-align: right; color: var(--muted); font-variant-numeric: tabular-nums; font-size: 13px; }
.slider svg { width: 18px; height: 18px; color: var(--muted); flex: none; }

/* buttons & chips */
.btn { border: 0; border-radius: 12px; padding: 10px 14px; background: var(--card-2); cursor: pointer; font-weight: 600; font-size: 14px; display: inline-flex; align-items: center; gap: 8px; transition: transform .08s, background .2s; }
.btn:active { transform: scale(.97); }
.btn.primary { background: var(--accent); color: var(--accent-ink); }
.btn.ghost { background: transparent; border: 1px solid var(--line); }
.btn.danger { background: var(--bad); color: #fff; }
.btn.small { padding: 7px 11px; font-size: 13px; border-radius: 10px; }
.btn svg { width: 18px; height: 18px; }
.btn:disabled { opacity: .5; cursor: default; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { border: 1px solid var(--line); background: transparent; border-radius: 999px; padding: 7px 13px; font-size: 13px; cursor: pointer; white-space: nowrap; }
.chip.active { background: var(--text); color: var(--bg); border-color: var(--text); }
.chip:active { transform: scale(.97); }
.seg { display: flex; background: var(--card-2); border-radius: 12px; padding: 3px; gap: 3px; }
.seg button { flex: 1; border: 0; background: transparent; border-radius: 9px; padding: 8px 6px; font-size: 13px; font-weight: 600; cursor: pointer; color: var(--muted); text-transform: capitalize; }
.seg button.active { background: var(--card); color: var(--text); box-shadow: 0 1px 3px rgba(0,0,0,.2); }
select.sel { width: 100%; background: var(--card-2); border: 1px solid var(--line); border-radius: 12px; padding: 9px 12px; }

.swatches { display: flex; gap: 10px; flex-wrap: wrap; }
.swatch { width: 34px; height: 34px; border-radius: 50%; border: 2px solid var(--line); cursor: pointer; padding: 0; }
.swatch.active { outline: 3px solid var(--text); outline-offset: 2px; }
.swatch.off { background: transparent; display: grid; place-items: center; color: var(--muted); }
.swatch.off svg { width: 18px; height: 18px; }

/* purifier hero */
.hero { display: flex; align-items: center; gap: 16px; }
.ring { --c: var(--ok); width: 104px; height: 104px; border-radius: 50%; flex: none; display: grid; place-items: center; text-align: center;
  background: radial-gradient(closest-side, var(--card) 79%, transparent 80% 100%), conic-gradient(var(--c) var(--deg, 100deg), var(--line) 0); }
.ring b { display: block; font-size: 30px; line-height: 1; letter-spacing: -.02em; }
.ring small { color: var(--muted); font-size: 11px; }
.facts { display: grid; grid-template-columns: auto 1fr; gap: 4px 12px; font-size: 14px; }
.facts dt { color: var(--muted); }
.facts dd { margin: 0; font-variant-numeric: tabular-nums; }
.bar { height: 6px; border-radius: 999px; background: var(--line); overflow: hidden; margin-top: 4px; }
.bar i { display: block; height: 100%; background: var(--ok); }
.stepper { display: flex; gap: 6px; }
.stepper button { flex: 1; height: 36px; border: 0; border-radius: 10px; background: var(--card-2); cursor: pointer; font-weight: 700; color: var(--muted); }
.stepper button.active { background: var(--accent); color: var(--accent-ink); }

.kv { display: grid; grid-template-columns: repeat(auto-fit, minmax(110px, 1fr)); gap: 8px; }
.kv div { background: var(--card-2); border-radius: 12px; padding: 10px 12px; }
.kv small { color: var(--muted); display: block; font-size: 12px; }
.kv b { font-size: 15px; font-variant-numeric: tabular-nums; }
.ok { color: var(--ok); }
.bad { color: var(--bad); }

details { background: var(--card-2); border-radius: 14px; padding: 10px 12px; margin-top: 10px; }
details summary { cursor: pointer; font-weight: 600; list-style: none; display: flex; justify-content: space-between; }
details summary::-webkit-details-marker { display: none; }
details summary::after { content: "›"; transform: rotate(90deg); transition: transform .2s; color: var(--muted); }
details[open] summary::after { transform: rotate(270deg); }
.clients { list-style: none; padding: 0; margin: 10px 0 0; font-size: 13px; max-height: 320px; overflow: auto; }
.clients li { display: flex; justify-content: space-between; gap: 10px; padding: 6px 0; border-top: 1px solid var(--line); }
.clients li span:last-child { color: var(--muted); font-variant-numeric: tabular-nums; text-align: right; }

.toast { position: fixed; left: 50%; bottom: calc(20px + env(safe-area-inset-bottom)); transform: translate(-50%, 30px); opacity: 0; pointer-events: none;
  background: var(--text); color: var(--bg); padding: 10px 16px; border-radius: 12px; font-size: 14px; max-width: calc(100% - 32px); transition: .25s; z-index: 10; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.error { background: var(--bad); color: #fff; }

dialog { border: 1px solid var(--line); border-radius: 18px; background: var(--card); color: var(--text); padding: 18px; max-width: 360px; width: calc(100% - 40px); }
dialog::backdrop { background: rgba(0,0,0,.5); backdrop-filter: blur(3px); }
dialog p { margin: 0 0 16px; }
.muted { color: var(--muted); }
.spacer { flex: 1; }

.info { background: color-mix(in srgb, var(--blue) 14%, transparent); color: color-mix(in srgb, var(--blue) 60%, var(--text)); border-radius: 12px; padding: 8px 12px; font-size: 13px; margin-bottom: 10px; }
.item.unreachable .name { color: var(--muted); }
.dot { width: 9px; height: 9px; border-radius: 50%; flex: none; background: var(--muted); }
.dot.ok { background: var(--ok); }
.dot.warn { background: var(--warn); }
.dot.bad { background: var(--bad); }
.tag { font-size: 12px; font-weight: 600; padding: 3px 9px; border-radius: 999px; background: var(--line); }
.tag.ok { color: var(--ok); background: color-mix(in srgb, var(--ok) 14%, transparent); }
.tag.warn { color: var(--warn); background: color-mix(in srgb, var(--warn) 14%, transparent); }
.tag.bad { color: var(--bad); background: color-mix(in srgb, var(--bad) 14%, transparent); }
.chip.dim { color: var(--muted); border-style: dashed; }

/* login */
.login-page { min-height: 100vh; display: grid; place-items: center; }
.login { width: min(360px, calc(100% - 32px)); text-align: center; padding: 28px 22px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.login img { border-radius: 18px; }
.login h1 { margin: 10px 0 18px; font-size: 26px; }
.login form { display: grid; gap: 12px; text-align: left; }
.login label { display: grid; gap: 6px; font-size: 13px; color: var(--muted); }
.login input { background: var(--card-2); border: 1px solid var(--line); border-radius: 12px; padding: 11px 12px; font-size: 16px; color: var(--text); }
.login input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.login .btn { justify-content: center; padding: 12px; margin-top: 4px; }
.login .err { margin: 0; }
.top .actions { display: flex; align-items: center; gap: 12px; }