:root {
  --bg: #f6f7f9; --card: #ffffff; --ink: #1b1f24; --mute: #5f6b7a; --line: #dde2e8;
  --brand: #1f3a5f; --brand-ink: #ffffff; --accent: #2f6fb3;
  --c-exact: #ffffff; --c-split: #fff6cc; --c-est: #ffe2c4;
  --c-exact-b: #c9d1da; --c-split-b: #e6cf5c; --c-est-b: #e39a52;
  --bad: #b3261e; --warn: #8a5a00; --ok: #1e6b35;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161b; --card: #1b2128; --ink: #e8ecf0; --mute: #9aa6b4; --line: #2c343e;
    --brand: #16283f; --accent: #6aa7e8;
    --c-exact: #1b2128; --c-split: #3a3416; --c-est: #42291a;
    --c-exact-b: #3a4450; --c-split-b: #8a7a2a; --c-est-b: #a0622e;
    --bad: #ff8a80; --warn: #e2b04a; --ok: #7fd396;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--ink); }
body { font: 16px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; padding-bottom: env(safe-area-inset-bottom); }
a { color: var(--accent); }
.top { position: sticky; top: 0; z-index: 5; background: var(--brand); color: var(--brand-ink); padding: 8px 16px 0; padding-top: max(8px, env(safe-area-inset-top)); }
.brand { font-weight: 700; font-size: 18px; }
.tabs { display: flex; gap: 4px; overflow-x: auto; margin-top: 6px; }
.tabs a { color: var(--brand-ink); opacity: .75; text-decoration: none; padding: 8px 12px; border-bottom: 3px solid transparent; white-space: nowrap; }
.tabs a.on { opacity: 1; border-bottom-color: var(--brand-ink); }
.status { font-size: 13px; color: var(--mute); padding: 6px 16px; border-bottom: 1px solid var(--line); }
.status.bad { color: var(--bad); }
main { padding: 12px 16px 32px; max-width: 1200px; margin: 0 auto; }
h2 { font-size: 18px; margin: 16px 0 8px; }
h3 { font-size: 16px; margin: 12px 0 6px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px; margin: 10px 0; }
.months { display: flex; gap: 6px; overflow-x: auto; margin: 4px 0 8px; }
.months button { font: inherit; border: 1px solid var(--line); background: var(--card); color: var(--ink); border-radius: 999px; padding: 6px 14px; }
.months button.on { background: var(--accent); color: #fff; border-color: var(--accent); }
.big { font-size: 30px; font-weight: 700; font-variant-numeric: tabular-nums; }
.range { color: var(--mute); font-size: 14px; }
.pill { display: inline-block; font-size: 12px; padding: 1px 8px; border-radius: 999px; border: 1px solid var(--line); color: var(--mute); margin-left: 6px; vertical-align: middle; }
.pill.est { background: var(--c-est); border-color: var(--c-est-b); color: var(--ink); }
.pill.fin { background: var(--c-exact); border-color: var(--c-exact-b); }
table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
td, th { padding: 6px 4px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { font-size: 13px; color: var(--mute); font-weight: 600; }
td.n, th.n { text-align: right; white-space: nowrap; }
tr.tot td { font-weight: 700; border-top: 2px solid var(--ink); }
.cert { border-left: 6px solid var(--c-exact-b); }
.cert-0 { border-left-color: var(--c-exact-b); }
.cert-1 { border-left-color: var(--c-split-b); background: var(--c-split); }
.cert-2 { border-left-color: var(--c-est-b); background: var(--c-est); }
td.cert-1, td.cert-2 { background: none; }
.legend { font-size: 13px; color: var(--mute); display: flex; gap: 12px; flex-wrap: wrap; }
.legend span::before { content: ""; display: inline-block; width: 12px; height: 12px; border-radius: 3px; margin-right: 4px; vertical-align: -1px; border: 2px solid var(--c-exact-b); }
.legend .l1::before { border-color: var(--c-split-b); background: var(--c-split); }
.legend .l2::before { border-color: var(--c-est-b); background: var(--c-est); }
ul.notes { margin: 6px 0; padding-left: 20px; }
ul.notes li { margin: 3px 0; }
.rooms { display: grid; grid-template-columns: 1fr; gap: 8px; }
.room { display: block; text-decoration: none; color: inherit; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; }
.room.sel { outline: 2px solid var(--accent); }
.room.cert-1 { border-left: 6px solid var(--c-split-b); background: var(--c-split); }
.room.cert-2 { border-left: 6px solid var(--c-est-b); background: var(--c-est); }
.room .row { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.room .name { font-weight: 700; }
.room .amt { font-weight: 700; font-size: 18px; font-variant-numeric: tabular-nums; }
.room .sub { color: var(--mute); font-size: 13px; display: flex; justify-content: space-between; gap: 8px; }
.split { display: block; }
.split .detail { margin-top: 12px; }
.empty { color: var(--mute); padding: 24px 0; }
label { display: block; font-size: 14px; color: var(--mute); margin: 10px 0 4px; }
input[type=text], input[type=password] { width: 100%; font: inherit; padding: 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--card); color: var(--ink); }
button.main { font: inherit; background: var(--accent); color: #fff; border: 0; border-radius: 8px; padding: 10px 16px; margin-top: 12px; }
button.ghost { font: inherit; background: none; color: var(--accent); border: 1px solid var(--accent); border-radius: 8px; padding: 8px 14px; margin: 12px 8px 0 0; }
.small { font-size: 13px; color: var(--mute); }
.meters td:first-child { width: 40%; }
.bad { color: var(--bad); }

/* Cover screen of the foldable (~360-420 px) is the base layout above.
   Inner screen (~700-900 px, almost square): rooms list and room detail side by side, wider grids. */
@media (min-width: 640px) {
  .rooms { grid-template-columns: 1fr 1fr; }
  .grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
  .grid2 > .card { margin: 0; }
}
@media (min-width: 700px) {
  .split { display: grid; grid-template-columns: minmax(260px, 340px) 1fr; gap: 16px; align-items: start; }
  .split .rooms { grid-template-columns: 1fr; position: sticky; top: 110px; max-height: calc(100vh - 130px); overflow-y: auto; }
  .split .detail { margin-top: 0; }
}