/* SmartAir monitoring site — shared by index.html (dashboard) and download.html.
   Palette follows the Sensor gateway dashboard (navy cards, blue accent) with a
   light variant; the OS setting picks the theme. */
:root {
  --bg: #f3f5f9;
  --card: #ffffff;
  --card-2: #f7f9fc;
  --line: #e1e6ef;
  --text: #172033;
  --muted: #5f6b82;
  --accent: #2f6fec;
  --accent-soft: #e6eeff;
  --on-accent: #ffffff;
  --ok: #0f9f6e;
  --warn: #c77700;
  --bad: #d92d2d;
  --off: #8a94a6;
  --ok-bg: #e3f6ee;
  --warn-bg: #fff3dc;
  --bad-bg: #fde8e8;
  --chip: #eef1f6;
  --shadow: 0 1px 2px rgba(23, 32, 51, 0.05);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1420;
    --card: #1a2233;
    --card-2: #151c2b;
    --line: #2a3550;
    --text: #e6ebf5;
    --muted: #8b96ad;
    --accent: #4f8cff;
    --accent-soft: #1d2b4a;
    --on-accent: #ffffff;
    --ok: #3ecf8e;
    --warn: #ffb454;
    --bad: #ff6b81;
    --off: #6b7688;
    --ok-bg: #163a2e;
    --warn-bg: #3a2c12;
    --bad-bg: #3a1620;
    --chip: #222c40;
    --shadow: none;
  }
  input[type="date"]::-webkit-calendar-picker-indicator { filter: invert(0.7); }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.45 "Pretendard", "Noto Sans KR", "Malgun Gothic", -apple-system, "Segoe UI", system-ui, sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
[hidden] { display: none !important; }

/* ------------------------------------------------------------ header */
.top { background: var(--card); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10; }
.top-inner {
  max-width: 1280px; margin: 0 auto; padding: 12px 24px;
  display: flex; flex-wrap: wrap; gap: 10px 20px; align-items: center; justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 12px; color: inherit; min-width: 0; }
.brand:hover { text-decoration: none; }
.logo {
  flex: none; width: 36px; height: 36px; border-radius: 10px; background: var(--accent); color: var(--on-accent);
  display: grid; place-items: center;
}
.brand h1 { margin: 0; font-size: 18px; line-height: 1.2; }
.status { display: flex; align-items: center; gap: 7px; color: var(--muted); font-size: 12.5px; margin-top: 2px; }
.dot { flex: none; width: 8px; height: 8px; border-radius: 50%; background: var(--off); }
.dot.ok { background: var(--ok); box-shadow: 0 0 0 3px var(--ok-bg); }
.dot.bad { background: var(--bad); box-shadow: 0 0 0 3px var(--bad-bg); }
.tabs {
  display: flex; gap: 3px; background: var(--chip); border: 1px solid var(--line); border-radius: 10px; padding: 3px;
  max-width: 100%; overflow-x: auto;
}
.tabs a {
  color: var(--muted); padding: 6px 14px; border-radius: 7px; font-size: 14px; white-space: nowrap;
}
.tabs a:hover { color: var(--text); text-decoration: none; }
.tabs a[aria-current="page"] { background: var(--accent); color: var(--on-accent); }

/* ------------------------------------------------------------ layout */
main { max-width: 1280px; margin: 0 auto; padding: 20px 24px 8px; display: grid; grid-template-columns: minmax(0, 1fr); gap: 22px; }
main.narrow, .foot.narrow { max-width: 980px; }
main > *, .tab-panel > * { min-width: 0; }
.tab-panel { display: grid; grid-template-columns: minmax(0, 1fr); gap: 22px; }
.section-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 14px; margin-bottom: 10px; }
.section-head h2 { margin: 0; font-size: 17px; }
.section-head .spacer { flex: 1; }
.page-head h2 { margin: 0 0 4px; font-size: 21px; }
.hint { color: var(--muted); font-size: 13px; margin: 6px 0 0; }
.error { background: var(--bad-bg); color: var(--bad); padding: 10px 14px; border-radius: 10px; }
.panel { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px; box-shadow: var(--shadow); }
.foot { max-width: 1280px; margin: 0 auto; padding: 10px 24px 28px; color: var(--muted); font-size: 12px; }

/* ----------------------------------------------------------- controls */
button { font: inherit; cursor: pointer; }
button:disabled { opacity: 0.5; cursor: default; }
.btn {
  background: var(--accent); color: var(--on-accent); border: 1px solid var(--accent); border-radius: 8px;
  padding: 7px 16px; font-size: 14px; white-space: nowrap;
}
.btn:hover:not(:disabled) { filter: brightness(1.08); }
.btn.secondary { background: transparent; color: var(--text); border-color: var(--line); }
.btn.secondary:hover:not(:disabled) { border-color: var(--accent); filter: none; }
.btn.small { padding: 4px 11px; font-size: 13px; }
select, input[type="date"] {
  font: inherit; font-size: 14px; color: var(--text); background: var(--card-2); border: 1px solid var(--line);
  border-radius: 8px; padding: 6px 10px; max-width: 100%; min-width: 0;
}
select:focus, input:focus, button:focus-visible, .tabs a:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chips button {
  border: 1px solid var(--line); background: var(--chip); color: var(--text); border-radius: 99px;
  padding: 4px 12px; font-size: 13px;
}
.chips button:hover { border-color: var(--accent); }
.chips button[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.seg { display: inline-flex; flex-wrap: wrap; border: 1px solid var(--line); border-radius: 9px; overflow: hidden; }
.seg button, .seg label {
  border: 0; border-left: 1px solid var(--line); background: var(--chip); color: var(--text);
  padding: 5px 13px; font-size: 13px; cursor: pointer; white-space: nowrap;
}
.seg > :first-child { border-left: 0; }
.seg button[aria-pressed="true"], .seg label:has(input:checked) { background: var(--accent); color: var(--on-accent); }
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg label:has(input:focus-visible) { outline: 2px solid var(--accent); outline-offset: -2px; }
.range { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.range .tilde { color: var(--muted); }

/* --------------------------------------------------------- live: KPI */
.kpis { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.kpi { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px; box-shadow: var(--shadow); }
.kpi .k { color: var(--muted); font-size: 12.5px; }
.kpi .v { font-size: 24px; font-weight: 700; font-variant-numeric: tabular-nums; margin-top: 2px; }
.kpi .v small { font-size: 14px; color: var(--muted); font-weight: 500; margin-left: 3px; }
.kpi.bad .v { color: var(--bad); }
.kpi.warn .v { color: var(--warn); }
.kpi.ok .v { color: var(--ok); }

/* ------------------------------------------------------ live: devices */
.devices { display: grid; grid-template-columns: repeat(auto-fill, minmax(310px, 1fr)); gap: 14px; }
.dev {
  position: relative; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 14px 16px 12px 19px;
  cursor: pointer; text-align: left; color: inherit; font: inherit; width: 100%; overflow: hidden; box-shadow: var(--shadow);
}
.dev::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--ok); }
.dev.lv-warn::before { background: var(--warn); }
.dev.lv-bad::before { background: var(--bad); }
.dev.offline::before { background: var(--off); }
.dev:hover { border-color: var(--accent); }
.dev.sel { border-color: var(--accent); box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 30%, transparent); }
.dev.offline .vals { opacity: 0.6; }
.dev-head { display: flex; justify-content: space-between; gap: 8px; align-items: flex-start; }
.dev-name { font-weight: 700; font-size: 16px; overflow-wrap: anywhere; }
.dev-loc { color: var(--muted); font-size: 13px; overflow-wrap: anywhere; }
.dev-id { color: var(--muted); font-size: 11.5px; font-family: ui-monospace, Consolas, monospace; }
.pill { flex: none; display: inline-flex; align-items: center; gap: 5px; font-size: 12px; padding: 2px 9px; border-radius: 99px; background: var(--chip); color: var(--muted); white-space: nowrap; }
.pill.on { background: var(--ok-bg); color: var(--ok); }
.pill.warn { background: var(--warn-bg); color: var(--warn); }
.pill.bad { background: var(--bad-bg); color: var(--bad); }
.vals { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 6px; margin-top: 12px; }
.val { background: var(--card-2); border: 1px solid var(--line); border-radius: 9px; padding: 6px 8px; min-width: 0; }
.val .k { font-size: 11px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.val .v { font-size: 17px; font-weight: 700; font-variant-numeric: tabular-nums; white-space: nowrap; }
.val .u { font-size: 11px; color: var(--muted); margin-left: 2px; font-weight: 400; }
.val.warn { background: var(--warn-bg); border-color: transparent; }
.val.warn .v { color: var(--warn); }
.val.bad { background: var(--bad-bg); border-color: transparent; }
.val.bad .v { color: var(--bad); }
.dev-foot { margin-top: 10px; font-size: 12px; color: var(--muted); }

/* --------------------------------------------------------- live: trend */
.controls { display: flex; flex-wrap: wrap; gap: 10px 18px; justify-content: space-between; margin-bottom: 12px; }
.chart-wrap { position: relative; height: 360px; }
.section-head select { flex: 0 1 340px; }

/* ------------------------------------------------------------ history */
.hq { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 18px; }
.hq label { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 13.5px; min-width: 0; max-width: 100%; word-break: keep-all; }
.hq label select { flex: 1 1 auto; min-width: 0; }
.hq .actions { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-left: auto; }
.status-line { flex-basis: 100%; color: var(--muted); font-size: 13px; min-height: 1.3em; }
.status-line.warn { color: var(--warn); }
.hgrid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.hcard { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 12px 14px 10px; box-shadow: var(--shadow); min-width: 0; }
.hcard-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 2px 10px; margin-bottom: 6px; }
.hcard-head h3 { margin: 0; font-size: 15px; }
.hcard-head h3 .u { color: var(--muted); font-weight: 400; font-size: 12.5px; margin-left: 4px; }
.hcard-head .meta { color: var(--muted); font-size: 12.5px; font-variant-numeric: tabular-nums; }
.hcard-head .meta b { color: var(--text); font-weight: 600; }
.hcard-head .meta b.bad { color: var(--bad); }
.hcard-head .meta b.warn { color: var(--warn); }
.hcard .chart-box { position: relative; height: 220px; }
.empty { color: var(--muted); text-align: center; padding: 36px 0; }

/* ----------------------------------------------------------- download */
.form-grid { display: grid; grid-template-columns: 84px minmax(0, 1fr); gap: 14px 16px; align-items: center; }
.form-grid > .k { color: var(--muted); font-size: 13.5px; }
.form-grid > .row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; min-width: 0; }
.form-grid .sub { flex-basis: 100%; color: var(--muted); font-size: 12.5px; }
.check { display: inline-flex; align-items: center; gap: 7px; font-size: 14px; cursor: pointer; }
.check input { width: 16px; height: 16px; accent-color: var(--accent); }
.form-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--line); }
.result { margin-top: 12px; font-size: 13.5px; color: var(--muted); min-height: 1.4em; }
.result.warn { color: var(--warn); }
.result b { color: var(--text); font-variant-numeric: tabular-nums; }
.link-box { display: flex; gap: 8px; align-items: stretch; margin-top: 12px; }
code, .url {
  font-family: ui-monospace, Consolas, "D2Coding", monospace; font-size: 12.5px; color: var(--text);
  background: var(--card-2); border: 1px solid var(--line); border-radius: 6px;
}
code { padding: 1px 5px; overflow-wrap: anywhere; }
.url { flex: 1; min-width: 0; padding: 7px 9px; overflow-x: auto; white-space: nowrap; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
th, td { text-align: left; padding: 7px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 500; white-space: nowrap; }
td:first-child { width: 36%; }
td code { white-space: nowrap; display: inline-block; margin: 1px 0; }
td.unit { white-space: nowrap; color: var(--muted); }
.panel h3 { margin: 0 0 8px; font-size: 15px; }
.panel h3 + .table-wrap { margin-bottom: 18px; }
ul.notes { margin: 6px 0 0; padding-left: 20px; color: var(--muted); font-size: 13.5px; line-height: 1.75; }
ul.notes b { color: var(--text); }

/* ------------------------------------------------------------- mobile */
@media (max-width: 900px) {
  .hgrid { grid-template-columns: minmax(0, 1fr); }
  .kpis { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .top-inner, main, .foot { padding-left: 16px; padding-right: 16px; }
  .tabs { width: 100%; }
  .tabs a { flex: 1; text-align: center; padding: 6px 8px; }
  .devices { grid-template-columns: minmax(0, 1fr); }
  .chart-wrap { height: 280px; }
  .hq .actions { margin-left: 0; }
  .form-grid { grid-template-columns: minmax(0, 1fr); gap: 6px; }
  .form-grid > .row { margin-bottom: 8px; }
  .link-box { flex-wrap: wrap; }
  .hq label { width: 100%; }
  th, td { padding: 6px 5px; }
  td:first-child { width: 40%; }
}
.pill .dot { width: 7px; height: 7px; background: currentColor; box-shadow: none; }