:root {
  --bg: #F2F3F1;
  --surface: #FFFFFF;
  --surface-2: #F7F8F7;
  --ink: #1B2127;
  --muted: #5C6670;
  --line: #D6DAD8;
  --accent: #1E5A86;
  --accent-ink: #FFFFFF;
  --accent-soft: #E3EDF5;
  --good: #2A7A4B;
  --good-soft: #E2F2E8;
  --bad: #B3261E;
  --bad-soft: #F8E3E1;
  --warn: #8A5A00;
  --warn-soft: #FBF0DA;
  --concrete: #C9CDCB;
  --concrete-edge: #7F878C;
  --steel: #3A4550;
  --display: "Barlow Condensed", "Arial Narrow", "Roboto Condensed", sans-serif;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --radius: 6px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14181C; --surface: #1C2227; --surface-2: #222930; --ink: #E6EAED; --muted: #9AA5AE;
    --line: #313A42; --accent: #6FA8D6; --accent-ink: #0E1A24; --accent-soft: #1E3142;
    --good: #6CC592; --good-soft: #17301F; --bad: #F08A80; --bad-soft: #3A1C1A; --warn: #E0B25C; --warn-soft: #33290F;
    --concrete: #4A5258; --concrete-edge: #8C969D; --steel: #D5DCE1;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #14181C; --surface: #1C2227; --surface-2: #222930; --ink: #E6EAED; --muted: #9AA5AE;
  --line: #313A42; --accent: #6FA8D6; --accent-ink: #0E1A24; --accent-soft: #1E3142;
  --good: #6CC592; --good-soft: #17301F; --bad: #F08A80; --bad-soft: #3A1C1A; --warn: #E0B25C; --warn-soft: #33290F;
  --concrete: #4A5258; --concrete-edge: #8C969D; --steel: #D5DCE1;
  color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 14px/1.45 var(--sans);
  padding: env(safe-area-inset-top, 0px) 16px env(safe-area-inset-bottom, 0px);
}
h1, h2, h3 { font-family: var(--display); letter-spacing: .01em; text-wrap: balance; margin: 0; }
sub { font-size: .72em; }
button, input, select { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* top bar */
.topbar {
  max-width: 1240px; margin: 0 auto; padding-block: 18px 14px;
  display: flex; flex-wrap: wrap; gap: 12px 24px; align-items: center; justify-content: space-between;
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; gap: 12px; align-items: center; }
.brand h1 { font-size: 28px; font-weight: 700; line-height: 1; text-transform: uppercase; letter-spacing: .04em; }
.brand p { margin: 2px 0 0; color: var(--muted); font-size: 13px; }
.mark {
  width: 34px; height: 34px; border-radius: 4px; flex: none;
  background:
    radial-gradient(circle at 30% 72%, var(--steel) 0 3px, transparent 3.5px),
    radial-gradient(circle at 50% 72%, var(--steel) 0 3px, transparent 3.5px),
    radial-gradient(circle at 70% 72%, var(--steel) 0 3px, transparent 3.5px),
    var(--concrete);
  border: 1.5px solid var(--concrete-edge);
}
.topbar-actions { display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: center; }
.mode { white-space: nowrap; display: flex; gap: 8px; align-items: center; font-size: 13px; color: var(--muted); }
.mode select { padding: 5px 8px; }
.api-status { font-size: 12px; color: var(--muted); display: inline-flex; align-items: center; gap: 6px; }
.api-status::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--line); }
.api-status[data-state="ok"]::before { background: var(--good); }
.api-status[data-state="waking"]::before { background: var(--warn); animation: pulse 1.2s infinite; }
.api-status[data-state="down"]::before { background: var(--bad); }
@keyframes pulse { 50% { opacity: .3; } }

/* layout */
.layout {
  max-width: 1240px; margin: 0 auto; padding-block: 20px 28px;
  display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 20px; align-items: start;
}
@media (max-width: 900px) { .layout { grid-template-columns: minmax(0, 1fr); } }

.inputs { display: grid; gap: 14px; }
.group {
  margin: 0; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface);
  padding: 12px 14px 14px; display: grid; gap: 10px; min-width: 0;
}
.group legend {
  font-family: var(--display); font-weight: 600; font-size: 15px; text-transform: uppercase; letter-spacing: .08em;
  color: var(--accent); padding: 0 6px; margin-left: -6px;
}
.row2, .row3, .row4 { display: grid; gap: 10px; align-items: end; }
.row2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.row3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.row4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 560px) {
  .row3, .row4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 380px) { .row2, .row3, .row4 { grid-template-columns: minmax(0, 1fr); } }

.field { display: grid; gap: 4px; min-width: 0; }
.field > label { font-size: 12.5px; color: var(--muted); }
select, input[type="number"], input[type="text"] {
  width: 100%; min-width: 0; padding: 7px 9px; border: 1px solid var(--line); border-radius: 4px;
  background: var(--surface-2);
}
input[type="number"], input[type="text"] { font-family: var(--mono); font-variant-numeric: tabular-nums; }
input:hover, select:hover { border-color: var(--concrete-edge); }
input.invalid { border-color: var(--bad); background: var(--bad-soft); }
.unit { display: flex; align-items: stretch; min-width: 0; }
.unit input { border-top-right-radius: 0; border-bottom-right-radius: 0; }
.unit span {
  flex: none; display: grid; place-items: center; padding: 0 8px; font-size: 12px; color: var(--muted);
  border: 1px solid var(--line); border-left: 0; border-radius: 0 4px 4px 0; background: var(--surface);
  white-space: nowrap;
}

.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 4px; overflow: hidden; align-self: end; width: fit-content; max-width: 100%; }
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg label { padding: 7px 14px; cursor: pointer; font-weight: 500; font-size: 13px; background: var(--surface-2); border-right: 1px solid var(--line); }
.seg label:last-of-type { border-right: 0; }
.seg input:checked + label { background: var(--accent); color: var(--accent-ink); }
.seg input:focus-visible + label { outline: 2px solid var(--accent); outline-offset: -2px; }
.seg.compact label { padding: 7px 10px; }

.hint { margin: 0; font-size: 12.5px; color: var(--warn); background: var(--warn-soft); padding: 6px 9px; border-radius: 4px; }
.derived { display: flex; flex-wrap: wrap; gap: 6px 22px; margin: 0; font-size: 12.5px; color: var(--muted); }
.derived div { display: flex; gap: 8px; }
.derived dd { margin: 0; font-family: var(--mono); color: var(--ink); }

.actions { display: flex; gap: 10px; flex-wrap: wrap; }
button {
  padding: 9px 16px; border-radius: 4px; border: 1px solid var(--line); background: var(--surface);
  cursor: pointer; font-weight: 500;
}
button:hover:not(:disabled) { border-color: var(--concrete-edge); }
button:disabled { opacity: .5; cursor: not-allowed; }
button.primary {
  background: var(--accent); color: var(--accent-ink); border-color: var(--accent);
  font-family: var(--display); font-size: 17px; letter-spacing: .06em; text-transform: uppercase; padding: 8px 26px;
}
button.primary:hover:not(:disabled) { filter: brightness(1.08); }

/* results */
.results { position: sticky; top: calc(env(safe-area-inset-top, 0px) + 12px); }
@media (max-width: 900px) { .results { position: static; } }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px 16px; display: grid; gap: 14px; }
.panel-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.panel-head h2 { font-size: 22px; text-transform: uppercase; letter-spacing: .05em; }
.pill { font-size: 12px; font-weight: 600; padding: 4px 10px; border-radius: 999px; background: var(--surface-2); color: var(--muted); border: 1px solid var(--line); white-space: nowrap; }
.pill[data-state="ok"] { background: var(--good-soft); color: var(--good); border-color: transparent; }
.pill[data-state="fail"] { background: var(--bad-soft); color: var(--bad); border-color: transparent; }
.pill[data-state="busy"] { background: var(--accent-soft); color: var(--accent); border-color: transparent; }
.error { margin: 0; color: var(--bad); background: var(--bad-soft); padding: 8px 10px; border-radius: 4px; }

.section-fig { margin: 0; background: var(--surface-2); border: 1px solid var(--line); border-radius: 4px; padding: 8px; }
.section-fig svg { width: 100%; height: auto; max-height: 280px; display: block; }
.section-fig figcaption { font-size: 12px; color: var(--muted); text-align: center; font-family: var(--mono); }
.sv-concrete { fill: var(--concrete); stroke: var(--concrete-edge); stroke-width: 1.2; }
.sv-cover { fill: none; stroke: var(--concrete-edge); stroke-dasharray: 3 3; stroke-width: .8; }
.sv-bar { fill: var(--steel); }
.sv-bar-comp { fill: var(--accent); }
.sv-dim { stroke: var(--muted); stroke-width: .8; fill: none; }
.sv-text { fill: var(--muted); font: 10px var(--mono); }

.res-block { display: grid; gap: 6px; border-top: 1px solid var(--line); padding-top: 10px; }
.res-block h3 { font-size: 15px; font-weight: 600; text-transform: uppercase; letter-spacing: .07em; color: var(--muted); display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.tag { font-family: var(--sans); text-transform: none; letter-spacing: 0; font-size: 12px; font-weight: 600; padding: 2px 8px; border-radius: 3px; }
.tag:empty { display: none; }
.tag[data-kind="none"] { background: var(--good-soft); color: var(--good); }
.tag[data-kind="some"] { background: var(--warn-soft); color: var(--warn); }
.kv { margin: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 6px 16px; }
@media (max-width: 420px) { .kv { grid-template-columns: minmax(0, 1fr); } }
.kv div { display: flex; justify-content: space-between; gap: 8px; border-bottom: 1px dotted var(--line); padding-block: 2px; min-width: 0; }
.kv dt { color: var(--muted); font-size: 12.5px; }
.kv dd { margin: 0; font-family: var(--mono); font-variant-numeric: tabular-nums; text-align: right; overflow-wrap: anywhere; }
.kv small { color: var(--muted); font-size: 11px; }

.gauge { position: relative; height: 8px; background: var(--surface-2); border: 1px solid var(--line); border-radius: 4px; overflow: hidden; }
#gauge-fill { height: 100%; width: 0; background: var(--good); transition: width .35s ease, background .2s; }
#gauge-fill.fail { background: var(--bad); }
.gauge-limit { position: absolute; top: -2px; bottom: -2px; left: 66.67%; width: 2px; background: var(--ink); opacity: .5; }

.update { display: grid; gap: 6px; margin-top: 4px; }
.update > label { font-size: 12.5px; color: var(--muted); }
.update-row { display: flex; gap: 8px; flex-wrap: wrap; }
.update-row .unit { flex: 1 1 160px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chips button { padding: 3px 9px; font-size: 12px; font-family: var(--mono); border-radius: 999px; background: var(--surface-2); }

.messages { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.messages li { font-size: 13px; padding: 7px 10px; border-radius: 4px; background: var(--accent-soft); }
.messages li.warn { background: var(--warn-soft); color: var(--warn); }
.export { display: flex; justify-content: flex-end; }

.foot {
  max-width: 1240px; margin: 0 auto; padding-block: 12px 24px; border-top: 1px solid var(--line);
  display: flex; flex-wrap: wrap; gap: 6px 24px; justify-content: space-between; color: var(--muted); font-size: 12px;
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }