/* UAV sizing — interactive app.
   Colour roles follow a validated palette: series-1..3 are categorical slots,
   status colours only ever mean good / warning / critical and always come
   with an icon and a word. */

:root {
  color-scheme: light;
  --page: #f9f9f7;
  --surface: #fcfcfb;
  --surface-2: #f3f2ee;
  --ink: #0b0b0b;
  --ink-2: #52514e;
  --muted: #898781;
  --grid: #e1e0d9;
  --axis: #c3c2b7;
  --border: rgba(11, 11, 11, 0.10);
  --series-1: #2a78d6;
  --series-2: #eb6834;
  --series-3: #1baf7a;
  --series-muted: #b9b7ae;
  --good: #0ca30c;
  --warning: #fab219;
  --serious: #ec835a;
  --critical: #d03b3b;
  --good-ink: #006300;
  --critical-ink: #b3261e;
  --accent: #2a78d6;
  --focus: #2a78d6;
  --shadow: 0 1px 2px rgba(11, 11, 11, 0.04), 0 2px 8px rgba(11, 11, 11, 0.04);
  --radius: 10px;
  --font: system-ui, -apple-system, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root:where(:not([data-theme="light"])) {
    color-scheme: dark;
    --page: #0d0d0d;
    --surface: #1a1a19;
    --surface-2: #232321;
    --ink: #ffffff;
    --ink-2: #c3c2b7;
    --muted: #898781;
    --grid: #2c2c2a;
    --axis: #383835;
    --border: rgba(255, 255, 255, 0.10);
    --series-1: #3987e5;
    --series-2: #d95926;
    --series-3: #199e70;
    --series-muted: #5a5954;
    --good-ink: #0ca30c;
    --critical-ink: #e66767;
    --accent: #3987e5;
    --focus: #6da7ec;
    --shadow: none;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #0d0d0d;
  --surface: #1a1a19;
  --surface-2: #232321;
  --ink: #ffffff;
  --ink-2: #c3c2b7;
  --muted: #898781;
  --grid: #2c2c2a;
  --axis: #383835;
  --border: rgba(255, 255, 255, 0.10);
  --series-1: #3987e5;
  --series-2: #d95926;
  --series-3: #199e70;
  --series-muted: #5a5954;
  --good-ink: #0ca30c;
  --critical-ink: #e66767;
  --accent: #3987e5;
  --focus: #6da7ec;
  --shadow: none;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.45;
}

button, input, select, textarea { font: inherit; color: inherit; }

:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }

/* ---------------------------------------------------------------- header */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 10px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.brand { display: flex; align-items: baseline; gap: 10px; min-width: 0; }
.brand h1 { font-size: 16px; font-weight: 650; margin: 0; white-space: nowrap; }
.brand input {
  border: 1px solid transparent;
  background: transparent;
  color: var(--ink-2);
  padding: 2px 6px;
  border-radius: 6px;
  width: 16ch;
}
.brand input:hover, .brand input:focus { border-color: var(--border); background: var(--surface-2); }

.actions { display: flex; gap: 6px; flex-wrap: wrap; margin-left: auto; align-items: center; }

.btn {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 8px;
  padding: 5px 11px;
  cursor: pointer;
  white-space: nowrap;
}
.btn:hover { background: var(--surface-2); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { filter: brightness(1.08); }
.btn:disabled { opacity: 0.5; cursor: default; }
select.btn { padding-right: 6px; }

.status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-size: 12px;
  min-width: 11ch;
}
.status .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--good);
}
.status.busy .dot { background: var(--series-1); animation: pulse 0.9s ease-in-out infinite; }
.status.error .dot { background: var(--critical); }
@keyframes pulse { 50% { opacity: 0.25; } }

/* ---------------------------------------------------------------- layout */
.layout {
  display: grid;
  grid-template-columns: 360px minmax(0, 1fr);
  min-height: calc(100vh - 54px);
}

.sidebar {
  position: sticky;
  top: 54px;
  height: calc(100vh - 54px);
  overflow-y: auto;
  border-right: 1px solid var(--border);
  background: var(--surface);
  padding: 8px 0 40px;
  scrollbar-width: thin;
  scrollbar-color: var(--axis) transparent;
}

.main { padding: 20px 24px 60px; min-width: 0; }

@media (max-width: 960px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; border-right: 0; border-bottom: 1px solid var(--border); }
  .main { padding: 16px; }
  .topbar { padding: 10px 16px; }
}

/* -------------------------------------------------------------- controls */
.group { border-bottom: 1px solid var(--border); }
.group > summary {
  list-style: none;
  cursor: pointer;
  padding: 12px 18px;
  font-weight: 650;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.group > summary::-webkit-details-marker { display: none; }
.group > summary::after { content: "▸"; color: var(--muted); transition: transform 0.15s; }
.group[open] > summary::after { transform: rotate(90deg); }
.group-body { padding: 0 18px 14px; display: grid; gap: 12px; }

.ctl { display: grid; gap: 4px; }
.ctl[hidden] { display: none; }
.ctl-head { display: flex; align-items: center; gap: 6px; justify-content: space-between; }
.ctl-label { font-size: 13px; color: var(--ink); }
.ctl-help-btn {
  border: 0; background: none; cursor: pointer; color: var(--muted);
  width: 20px; height: 20px; border-radius: 50%; padding: 0; line-height: 20px;
  font-size: 12px;
}
.ctl-help-btn:hover { background: var(--surface-2); color: var(--ink); }
.ctl-help { font-size: 12px; color: var(--ink-2); margin: 0; }
.ctl-help[hidden] { display: none; }

.ctl-row { display: flex; align-items: center; gap: 8px; }
.ctl-row input[type="range"] { flex: 1; min-width: 0; accent-color: var(--accent); }
.ctl-row input.num {
  width: 84px;
  padding: 3px 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface-2);
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.ctl-unit { color: var(--muted); font-size: 12px; min-width: 34px; }
.ctl.auto input[type="range"], .ctl.auto input.num { opacity: 0.45; }
.ctl-auto { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--ink-2); cursor: pointer; }
.ctl-auto .resolved { color: var(--muted); font-variant-numeric: tabular-nums; white-space: nowrap; }

.ctl select {
  width: 100%;
  padding: 5px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface-2);
}
.ctl-note { font-size: 12px; color: var(--muted); margin: 0; }

.switch { display: flex; align-items: center; gap: 8px; cursor: pointer; font-size: 13px; }
.switch input { accent-color: var(--accent); width: 16px; height: 16px; }

.segmented { display: flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.segmented button {
  flex: 1; border: 0; background: var(--surface-2); padding: 5px 4px; cursor: pointer;
  font-size: 12px; border-right: 1px solid var(--border);
}
.segmented button:last-child { border-right: 0; }
.segmented button[aria-pressed="true"] { background: var(--accent); color: #fff; }

.datasheet textarea {
  width: 100%;
  min-height: 150px;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 12px;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface-2);
  resize: vertical;
}
.datasheet .grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.datasheet label { font-size: 12px; color: var(--ink-2); display: grid; gap: 2px; }
.datasheet input.num {
  padding: 3px 6px; border: 1px solid var(--border); border-radius: 6px; background: var(--surface-2);
}

/* --------------------------------------------------------------- verdict */
.banner {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 14px 16px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--muted);
  box-shadow: var(--shadow);
  margin-bottom: 14px;
}
.banner .icon {
  width: 26px; height: 26px; border-radius: 50%;
  display: grid; place-items: center; color: #fff; font-weight: 700; flex: none;
}
.banner h2 { margin: 0; font-size: 17px; font-weight: 650; }
.banner p { margin: 2px 0 0; color: var(--ink-2); font-size: 13px; }
.banner.good { border-left-color: var(--good); } .banner.good .icon { background: var(--good); }
.banner.warn { border-left-color: var(--warning); } .banner.warn .icon { background: var(--warning); color: #0b0b0b; }
.banner.bad { border-left-color: var(--critical); } .banner.bad .icon { background: var(--critical); }

.error-banner {
  padding: 10px 14px; border-radius: var(--radius); margin-bottom: 14px;
  border: 1px solid var(--critical); color: var(--critical-ink); background: var(--surface);
}
.error-banner[hidden] { display: none; }

/* ------------------------------------------------------------------ KPIs */
.kpis {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(165px, 1fr));
  gap: 10px;
  margin-bottom: 14px;
}
.kpi {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
  box-shadow: var(--shadow);
  position: relative;
}
.kpi .label { font-size: 12px; color: var(--ink-2); display: flex; align-items: center; gap: 6px; }
.kpi .value { font-size: 24px; font-weight: 650; margin: 2px 0; letter-spacing: -0.01em; }
.kpi .sub { font-size: 12px; color: var(--muted); }
.kpi .flag { width: 8px; height: 8px; border-radius: 50%; flex: none; }
.kpi .flag.good { background: var(--good); }
.kpi .flag.warn { background: var(--warning); }
.kpi .flag.bad { background: var(--critical); }
.kpi .flag.neutral { background: var(--series-muted); }
.kpi .flag-word { font-size: 11px; margin-left: auto; color: var(--muted); }

/* -------------------------------------------------------------- warnings */
.warnings {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px 16px;
  margin-bottom: 18px;
  box-shadow: var(--shadow);
}
.warnings > summary { cursor: pointer; padding: 10px 0; font-weight: 600; }
.warnings ul { margin: 0 0 12px; padding: 0; list-style: none; display: grid; gap: 8px; }
.warnings li { display: flex; gap: 10px; font-size: 13px; color: var(--ink-2); }
.warnings li::before { content: "!"; flex: none; width: 18px; height: 18px; border-radius: 50%;
  background: var(--warning); color: #0b0b0b; font-weight: 700; font-size: 12px;
  display: grid; place-items: center; margin-top: 1px; }
.warnings li.critical::before { background: var(--critical); color: #fff; }

/* ---------------------------------------------------------------- charts */
.section-title { font-size: 13px; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--muted); margin: 26px 0 10px; font-weight: 600; }

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(420px, 1fr));
  gap: 14px;
}
@media (max-width: 520px) { .cards { grid-template-columns: 1fr; } }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px 10px;
  box-shadow: var(--shadow);
  min-width: 0;
  transition: opacity 0.2s;
}
.card.wide { grid-column: 1 / -1; }
.card[hidden] { display: none; }
.card.stale { opacity: 0.55; }
.card-head { display: flex; gap: 10px; align-items: flex-start; }
.card-head h3 { margin: 0; font-size: 15px; font-weight: 650; }
.card-head .what { margin: 2px 0 0; color: var(--ink-2); font-size: 12.5px; }
.card-head .tools { margin-left: auto; display: flex; gap: 6px; flex: none; }
.card-head .tools .btn { font-size: 12px; padding: 3px 9px; }
.card .stat-line { font-size: 13px; color: var(--ink-2); margin: 8px 0 0; }
.card .stat-line strong { color: var(--ink); }
.plot { width: 100%; height: 320px; margin-top: 6px; }
.plot.tall { height: 400px; }
.plot.short { height: 200px; }
.empty { display: grid; place-items: center; height: 180px; color: var(--muted); font-size: 13px; text-align: center; padding: 0 20px; }

.table-view { margin-top: 8px; max-height: 320px; overflow: auto; }
.table-view[hidden] { display: none; }
table.data { border-collapse: collapse; width: 100%; font-size: 12.5px; }
table.data th, table.data td { padding: 5px 8px; border-bottom: 1px solid var(--grid); text-align: right; }
table.data th:first-child, table.data td:first-child { text-align: left; }
table.data th { color: var(--ink-2); font-weight: 600; position: sticky; top: 0; background: var(--surface); }
table.data td { font-variant-numeric: tabular-nums; }

details.guide { margin-top: 6px; border-top: 1px solid var(--grid); }
details.guide > summary {
  cursor: pointer; padding: 8px 0 6px; font-size: 13px; color: var(--accent); font-weight: 600;
}
details.guide h4 { margin: 10px 0 4px; font-size: 12px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); }
details.guide ul { margin: 0; padding-left: 18px; display: grid; gap: 5px; font-size: 13px; color: var(--ink-2); }

/* --------------------------------------------------------------- summary */
.summary-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 14px; }
.summary-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px 16px; box-shadow: var(--shadow); }
.summary-card h3 { margin: 0 0 6px; font-size: 14px; }
.summary-card table { width: 100%; border-collapse: collapse; font-size: 12.5px; }
.summary-card td { padding: 4px 0; border-bottom: 1px solid var(--grid); vertical-align: top; }
.summary-card td:first-child { color: var(--ink-2); padding-right: 12px; width: 44%; }
.legs-card { grid-column: 1 / -1; overflow-x: auto; }

.footer-note { color: var(--muted); font-size: 12px; margin-top: 30px; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ------------------------------------------------------------ view tabs */
.view-tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin: 4px 0 18px; }
.view-tabs button {
  border: 0; background: none; padding: 9px 14px; cursor: pointer; font-weight: 600;
  color: var(--ink-2); border-bottom: 2px solid transparent; margin-bottom: -1px;
}
.view-tabs button:hover { color: var(--ink); }
.view-tabs button[aria-selected="true"] { color: var(--ink); border-bottom-color: var(--accent); }

/* ------------------------------------------------------------- optimiser */
.opt-layout { display: grid; grid-template-columns: minmax(0, 1fr); gap: 14px; }
.opt-form h4 { margin: 16px 0 6px; font-size: 12px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); }
.opt-form .intro { color: var(--ink-2); font-size: 13px; margin: 4px 0 10px; }
.opt-form select { padding: 5px 8px; border: 1px solid var(--border); border-radius: 6px; background: var(--surface-2); min-width: 280px; }
.opt-vars { width: 100%; border-collapse: collapse; font-size: 13px; }
.opt-vars th { text-align: left; color: var(--ink-2); font-weight: 600; font-size: 12px; padding: 4px 6px; border-bottom: 1px solid var(--grid); }
.opt-vars td { padding: 4px 6px; border-bottom: 1px solid var(--grid); vertical-align: middle; }
.opt-vars tr.off td:not(:first-child) { opacity: 0.45; }
.opt-vars td.current { color: var(--muted); font-variant-numeric: tabular-nums; white-space: nowrap; }
.opt-vars input.num { width: 76px; padding: 3px 6px; border: 1px solid var(--border); border-radius: 6px; background: var(--surface-2); text-align: right; }
.opt-vars label { display: flex; align-items: center; gap: 8px; cursor: pointer; }
.opt-hint { font-size: 12px; color: var(--muted); margin: 6px 0 0; }
.opt-constraints { display: grid; gap: 6px; font-size: 13px; }
.opt-constraints label { display: flex; align-items: center; gap: 8px; cursor: pointer; }
.opt-constraints input.num { width: 64px; padding: 2px 6px; border: 1px solid var(--border); border-radius: 6px; background: var(--surface-2); text-align: right; }
.opt-constraints .muted { color: var(--muted); }
.opt-run { display: flex; align-items: center; gap: 12px; margin-top: 16px; flex-wrap: wrap; }
.opt-run .count { color: var(--ink-2); font-size: 13px; }
.opt-run .count.bad { color: var(--critical-ink); }
.opt-note { font-size: 12.5px; color: var(--ink-2); background: var(--surface-2); border-radius: 8px; padding: 8px 10px; margin: 10px 0 0; }
.opt-best { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; margin: 10px 0 4px; }
.opt-best .value { font-size: 26px; font-weight: 650; }
.opt-best .changes { font-weight: 600; }
.opt-best .delta { color: var(--good-ink); font-weight: 600; }
.opt-best .delta.worse { color: var(--critical-ink); }
.opt-best .btn { margin-left: auto; }
.opt-metrics { color: var(--ink-2); font-size: 13px; margin: 0 0 6px; }
table.data tr.baseline td { font-weight: 600; background: var(--surface-2); }
table.data tr.baseline td:last-child { white-space: nowrap; }
.opt-empty { color: var(--ink-2); font-size: 13px; padding: 10px 0; }
@media (max-width: 700px) { .opt-vars .optional { display: none; } }